Abrégé

A valve assembly is provided herein. The valve assembly includes a service brake supply line to connect a service brake supply port to a first pump, a brake release valve to connect to a parking brake release line, and a safety valve connected to a supply port of the brake release valve. The safety valve is configured to connect the supply port to a second pump in a first position and to connect the supply port to a tank in a second position. The safety valve comprises an operator to place the safety valve in the second position responsive to a pressure reduction at the service brake supply port.

Classes IPC  ?

• B60T 13/66 - Commande électrique des systèmes de freins à fluide sous pression
• B60T 13/68 - Commande électrique des systèmes de freins à fluide sous pression par valves commandées électriquement
• B60T 17/22 - Dispositifs pour surveiller ou vérifier les systèmes de freinsDispositifs de signalisation

Abrégé

A steering system includes an actuator to adjust a steering angle of the steering system and a primary electrical power source to provide a first flow of electrical power. A mechanical to electrical conversion device converts a mechanical steering input into a second flow of electrical power. Circuitry is configured to detect a fault the steering system and based on detection of the fault to switch operation of the steering system between a normal mode and a fail-operational mode. In the normal mode, the first flow of electrical power from the primary electrical power source causes the actuator to adjust the steering angle. In the fail-operational mode the second flow of electric power from the mechanical to electrical conversion device causes the actuator to adjust the steering angle.

Classes IPC  ?

• B62D 5/00 - Direction assistée ou à relais de puissance

Abrégé

A hydraulic control system includes an electrohydraulic valve and a controller. The electrohydraulic valve is in fluid communication with a control chamber of a control valve and includes a solenoid and a valve member actuatable by the solenoid. The controller is in communication with the solenoid and is configured to detect a change in an electromagnetic characteristic of the solenoid that is correlated to a hydraulic disturbance within the hydraulic control system.

Classes IPC  ?

• G01L 27/00 - Test ou étalonnage des appareils pour la mesure de la pression des fluides
• F15B 13/02 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs
• F16K 31/02 - Moyens de fonctionnementDispositifs de retour à la position de repos électriquesMoyens de fonctionnementDispositifs de retour à la position de repos magnétiques

Abrégé

Methods and systems for detecting a leak within a hydraulic valve are disclosed. The methods include activating, via a controller, a camera and a light source, taking, via the camera, a first image of a valve, pressurizing the valve with a dyed fluid to a predetermined pressure value, the dyed fluid to emit a fluorescent glow in response to illumination via the light source, taking, via the camera, a second image of the valve after pressurization of the valve, comparing, via a processor, the first image of the valve to the second image of the valve, and detecting, via the processor, a leak when fluorescent glow is detected in the second image.

Classes IPC  ?

• G01M 3/22 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide par détection de la présence du fluide à l'emplacement de la fuite en utilisant des révélateurs particuliers, p. ex. teinture, produits fluorescents, produits radioactifs pour tuyaux, câbles ou tubesExamen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide par détection de la présence du fluide à l'emplacement de la fuite en utilisant des révélateurs particuliers, p. ex. teinture, produits fluorescents, produits radioactifs pour raccords ou étanchéité de tuyauxExamen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide par détection de la présence du fluide à l'emplacement de la fuite en utilisant des révélateurs particuliers, p. ex. teinture, produits fluorescents, produits radioactifs pour soupapes
• G01M 3/38 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation de la lumière

Abrégé

A valve assembly includes a first valve to control a first hydraulic function and a second valve to control a second hydraulic function. The first valve includes a first pump rail and a first post-compensation valve, and the second valve includes a second pump rail and a second post¬ compensation valve. A pre-compensation device is operable between a closed configuration, a metering configuration, and an open configuration to regulate fluid flow from a pump to the first pump rail and the second pump rail based on a demand from at least one of the first valve and the second valve. When one of the first valve and the second valve commands a higher pressure than the other of the first valve and the second valve, the fluid flow provided by the pre-compensation is shared proportionally between the first valve and the second valve.

Classes IPC  ?

• F15B 11/042 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie pour commander la vitesse par des moyens de commande situés dans le circuit d'alimentation
• F15B 11/16 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs
• F15B 13/02 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs
• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique
• F15B 13/042 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide
• F15B 13/08 - Assemblages de distributeurs élémentaires utilisés chacun pour la commande d'un seul servomoteur
• F15B 13/00 - Parties constitutives des systèmes de servomoteurs

Abrégé

A hydraulic system includes a poppet control valve having an inlet workport, a function workport, a control chamber, and a poppet arranged between the inlet workport and the control chamber. The poppet is movable between an open position and a closed position. The hydraulic system further includes a pilot control valve. A pressure correlated to the function workport is supplied to a first side of the pilot control valve and a pilot source pressure is supplied to a second side of the pilot control valve. When a pressure in the function workport reaches a setpoint pressure, the pressure correlated to the function workport forces the pilot control valve to a position that increases a flow restriction between the control chamber and the function workport, so that the poppet moves in a direction toward the closed position and limits the pressure in the function workport to the setpoint pressure.

Classes IPC  ?

• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique
• F15B 13/043 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide avec clapets-pilotes commandés électriquement

Abrégé

A return manifold includes a housing having a first workport, a second workport, a third workport, and a fourth workport, and defining a first chamber and a second chamber. The return manifold includes a back-pressure disk arranged between the first workport and the first chamber, a bypass disk arranged between the first chamber and the second chamber, a back-pressure spring biased between the back-pressure disk and the bypass disk, and a bypass spring biased against the bypass disk. The back-pressure disk and the bypass disk are hydro-mechanically coupled so that movement of the bypass disk alters a force on the back-pressure disk and movement of the back-pressure disk alters a force on the bypass disk.

Classes IPC  ?

• F15B 21/04 - Mesures particulières prises en rapport avec les propriétés du fluide
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques

Abrégé

A control valve includes a poppet assembly with an integral relief valve function. The control valve includes a valve body defining a first port and a second port in communication with a first bore. A main poppet is moveable within the first bore to selectively couple the first port and the second port, and to define a control chamber within the first bore. The main poppet defines a second bore extending through the main poppet to allow fluid to flow from the control chamber to the second port. A relief poppet is moveable within the second bore to selectively couple the control chamber to the second port via the second bore. The relief poppet defines a third bore extending through the first poppet to allow fluid to flow from the control chamber to the second port.

Classes IPC  ?

• F15B 13/02 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs
• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique
• F15B 13/043 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide avec clapets-pilotes commandés électriquement
• F15B 21/045 - Compensation des variations de viscosité ou de température

Abrégé

A valve system is configured to provide thermal pressure relief for an actuator, which is controlled by a first control valve that is operated by a smaller pilot valve. The valve system includes a third valve configured to relief pressure from the actuator to a tank. The third valve has a control element with a high pressure reference to a load-holding side of the actuator and a low pressure reference to the tank, a second control valve, or the atmosphere. The third valve is one of a relief valve arranged in parallel with the first control valve and the pilot valve, between the actuator and the tank, or a sequence valve arranged in series between the pilot valve and the tank.

Classes IPC  ?

• F15B 13/01 - Clapets de blocage ou autres dispositifs de détente
• F15B 13/043 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide avec clapets-pilotes commandés électriquement
• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique

Abrégé

A control valve for a steering system for a hydraulic machine includes a valve body defining a first actuator port, a second actuator port, a tank port, a pump port, and a manual steer interface. A directional control spool is disposed within the valve body to selectively couple the first actuator port, the second actuator port, the tank port, and the pump port. Additionally, an isolator spool is disposed within the valve body to selectively couple the directional control spool to each of the first actuator port, the second actuator port, and the pump port, and to selectively couple the pump port to the manual steer interface.

Classes IPC  ?

• B62D 1/00 - Commandes de direction, c.-à-d. moyens pour produire un changement de direction du véhicule
• B62D 1/22 - Éléments de commandes de direction en double, p. ex. pour les leçons de conduite
• B62D 1/24 - Commandes de direction, c.-à-d. moyens pour produire un changement de direction du véhicule non montées sur le véhicule
• B62D 1/28 - Commandes de direction, c.-à-d. moyens pour produire un changement de direction du véhicule non montées sur le véhicule non mécaniques
• B62D 5/00 - Direction assistée ou à relais de puissance
• B62D 5/06 - Direction assistée ou à relais de puissance à fluide, c.-à-d. au moyen d'un fluide sous pression produisant toute la force nécessaire, ou la plus grande partie de celle-ci, pour commander la direction du véhicule
• A01B 69/00 - Direction des machines ou instruments agricolesGuidage des machines ou instruments agricoles selon un parcours déterminé
• B62D 6/00 - Dispositions pour la commande automatique de la direction en fonction des conditions de conduite, qui sont détectées et pour lesquelles une réaction est appliquée, p. ex. circuits de commande
• B62D 6/08 - Dispositions pour la commande automatique de la direction en fonction des conditions de conduite, qui sont détectées et pour lesquelles une réaction est appliquée, p. ex. circuits de commande réagissant uniquement au couple d'entrée

Abrégé

A modular hydraulic valve can be used to operatively couple one or more pumps to one or more consumers without the need for spacing elements between adjacent valve sections. The modular valve can include a valve stack secured between two covers that define pump inlets. The valve stack can include a plurality of valve sections arranged into valve section assemblies, each configured to receive flow from one or more of the pump inlets. Each valve section can be formed by selecting either a first housing configuration or a second housing configuration and inserting one of three different types of spools into the housing, thereby coupling the valve section to the desired one or more pump inlets.

Classes IPC  ?

• F15B 13/08 - Assemblages de distributeurs élémentaires utilisés chacun pour la commande d'un seul servomoteur

Abrégé

A ride control valve includes a valve body defining a work passage, a pump passage, a tank passage, and an accumulator passage configure to couple to an accumulator. A ride control spool is movably disposed within the valve body and configured to move between a a first ride control position to discharge the accumulator, a second ride control position configured to charge the accumulator at a variable charge rate, a third ride control configured to balance the accumulator pressure with the work passage pressure, and a fourth ride control position configured to couple the accumulator to the work passage. A pressure balancing spool is movably disposed within the ride control spool to selectively couple the accumulator passage with each of the pump passage and the tank passage to balance the accumulator pressure. The ride control valve is configured couple to a directional control valve without external conduit.

Classes IPC  ?

• E02F 9/22 - Entraînements hydrauliques ou pneumatiques

Abrégé

A hydraulic control system includes a plurality pumps, a plurality of consumers selectively fluidically coupled to the plurality of pumps, and a controller in communication with the plurality of pumps and the plurality of consumers. In one example, the controller may be configured to group one or more of the plurality of pumps with one or more of the plurality of consumers based on at least one of a pressure and a flow rate of the consumer.

Classes IPC  ?

• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• F04B 49/06 - Commande utilisant l'électricité
• F15B 11/17 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs utilisant plusieurs pompes

Abrégé

A relief circuit is operable between a first state and a second state to allow different functions of a hydraulic system to relieve at different pressures. In the first state of the relief circuit, the relief circuit is configured so that each of the functions of the hydraulic system relieve at the same pressure. In the second state of the relief circuit, the relief circuit is configured so different functions of the hydraulic system can operate simultaneously while also relieving at different pressures. In particular, a first function relieves at a first pressure and a second function relieves at a second pressure that is higher than the first pressure.

Classes IPC  ?

• F15B 11/02 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie

Produits et services

Hydraulic valves, selector and control valves. Electrohydraulic valves; electronic controllers to control electrohydraulic valves and electronically controlled pumps; electronic actuators to actuate a hydraulic valve as a type of solenoid force motor.

Produits et services

(1) Hydraulic valves being parts of machines and hydraulic selector valves being parts of machines and pump control valves (2) Electrohydraulic control valves for use in vehicles for regulating the flow of gases and liquids; electronic controllers for use in vehicles to control electrohydraulic valves and electronically controlled pumps to regulate the flow of gases and liquids; electronic actuators to actuate a hydraulic valve as a type of solenoid force motor

Abrégé

Systems and methods for controlling operation of an off-highway vehicle are provided. A control method includes receiving an input command that includes at least one of a manual input command and an automatic input command, determining if an operator attention level is at a first attention level, a second attention level, or a third attention level, generating at least one output parameter based on the determined operator attention level and the input command, generating an output command based on the at least one output parameter, and outputting the output command to the first work function to control operation of the first work function based on the output command.

Classes IPC  ?

• E02F 9/26 - Dispositifs indicateurs
• G05D 1/00 - Commande de la position, du cap, de l'altitude ou de l'attitude des véhicules terrestres, aquatiques, aériens ou spatiaux, p. ex. utilisant des pilotes automatiques

Produits et services

Electronic controllers to control electrohydraulic valves and electronically controlled pumps.

Produits et services

Hydraulic valves, selector and control valves. Electrohydraulic valves; electronic actuators to actuate a hydraulic valves as a type of solenoid force motor.

Produits et services

(1) Hydraulic valves being parts of machines and hydraulic selector valves being parts of machines and pump control valves (2) Electrohydraulic control valves for use in vehicles for regulating the flow of gases and liquids; electronic actuators to actuate a hydraulic valves as a type of solenoid force motor

Produits et services

(1) Electronic controllers for use in vehicles to control electrohydraulic valves and electronically controlled pumps to regulate the flow of gases and liquids

Abrégé

A return manifold includes a housing having a first workport, a second workport, a third workport, and a fourth workport, and defining a first chamber and a second chamber. The return manifold includes a back-pressure disk arranged between the first workport and the first chamber, a bypass disk arranged between the first chamber and the second chamber, a back-pressure spring biased between the back-pressure disk and the bypass disk, and a bypass spring biased against the bypass disk. The back-pressure disk and the bypass disk are hydro-mechanically coupled so that movement of the bypass disk alters a force on the back-pressure disk and movement of the back-pressure disk alters a force on the bypass disk.

Classes IPC  ?

• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• F15B 11/028 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie pour régler la puissance
• F15B 13/042 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide
• F16K 15/12 - Ressorts pour soupapes en forme de bague
• F16K 17/04 - Soupapes ou clapets de sûretéSoupapes ou clapets d'équilibrage ouvrant sur excès de pression d'un côtéSoupapes ou clapets de sûretéSoupapes ou clapets d'équilibrage fermant sur insuffisance de pression d'un côté actionnés par ressort

Abrégé

A hydraulic system includes a poppet control valve having an inlet workport, a function workport, a control chamber, and a poppet arranged between the inlet workport and the control chamber. The poppet is movable between an open position and a closed position. The hydraulic system further includes a pilot control valve. A pressure correlated to the function workport is supplied to a first side of the pilot control valve and a pilot source pressure is supplied to a second side of the pilot control valve. When a pressure in the function workport reaches a setpoint pressure, the pressure correlated to the function workport forces the pilot control valve to a position that increases a flow restriction between the control chamber and the function workport, so that the poppet moves in a direction toward the closed position and limits the pressure in the function workport to the setpoint pressure.

Classes IPC  ?

• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique
• F15B 13/042 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide

Produits et services

Hydraulic valves being parts of machines and hydraulic selector valves being parts of machines and pump control valves Electrohydraulic control valves for use in vehicles for regulating the flow of gases and liquids; electronic actuators to actuate a hydraulic valve as a type of solenoid force motor; hydraulic directional control valves for use in vehicles

Produits et services

Electronic controllers to control electrohydraulic valves and electronically controlled pumps

Produits et services

Hydraulic valves being parts of machines and hydraulic selector valves being parts of machines and pump control valves Electrohydraulic control valves for use in vehicles for regulating the flow of gases and liquids; electronic controllers to control electrohydraulic valves and electronically controlled pumps; electronic actuators to actuate a hydraulic valve as a type of solenoid force motor; hydraulic directional control valves for use in vehicles

Abrégé

Systems and methods for control of multi-function hydraulic commands of a multi-function electrohydraulic system are provided. In one aspect, a system for hydraulic control includes a first function in fluid communication with a first electrohydraulic control valve and a second function in fluid communication with a second electrohydraulic control valve. The system includes a controller in communication with the first electrohydraulic control valve and the second electrohydraulic control valve. The controller can be configured to receive an input target command, determine an achievable function rate based on the input target command, where the achievable function rate maintains a proportional relationship between the input target command and the achievable function rate. The controller can also map the achievable function rate to an output command based on a predetermined relationship between the achievable function rates and the output commands and supply the output command to the first and second electrohydraulic valves.

Classes IPC  ?

• F15B 21/08 - Systèmes de servomoteur comportant des moyens de commande actionnés électriquement
• F15B 19/00 - Test des systèmes ou appareils de manœuvre utilisant la pression d'un fluide, dans la mesure où ils ne sont pas prévus ailleurs

Abrégé

A load sense pressure regulating system is provided. The load sense pressure regulating system can be operable between a flow regulation mode and a pressure limiting mode. When the load sense pressure control system is in the flow regulation mode, flow between a load sense inlet and a pilot vent are metered by a main poppet. The load sense pressure regulating system can also include a control valve downstream from the pilot vent that is configured to control a relief setting of a relief valve to regulate the load sense pressure within a desired operating range.

Classes IPC  ?

• F16K 31/124 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide le fluide agissant sur un piston servo-commandé
• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique
• F15B 13/043 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide avec clapets-pilotes commandés électriquement
• F16K 31/40 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide et dans lesquels il y a alimentation constante du moteur à fluide par le fluide provenant de la canalisation avec un organe actionné électriquement dans la décharge du moteur
• F15B 13/02 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs
• F15B 11/16 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs

Abrégé

Systems and methods for controlling operation of an off-highway vehicle are provided. A control method includes receiving an input command that includes at least one of a manual input command and an automatic input command, determining if an operator attention level is at a first attention level, a second attention level, or a third attention level, generating at least one output parameter based on the determined operator attention level and the input command, generating an output command based on the at least one output parameter, and outputting the output command to the first work function to control operation of the first work function based on the output command.

Classes IPC  ?

• G05B 23/02 - Test ou contrôle électrique

Abrégé

A hydraulic system is provided. The hydraulic system may include a fluid pressure source in fluid communication with a supply line, a return line in fluid communication with a tank, a hydraulic function having a workport, a first control valve having a first proportional solenoid, a second control valve having a second proportional solenoid, and a controller. The controller being configured to selectively energize the first proportional solenoid, the second proportional solenoid, or the first proportional solenoid and the second proportional solenoid to control a system pressure differential, defined between the return line and the workport, within a range that is defined by a sum of a first predefined range defined by the first control valve and a second predefined range defined by the second control valve.

Classes IPC  ?

• F15B 11/028 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie pour régler la puissance
• F15B 1/033 - Installations ou systèmes comprenant des accumulateurs comportant des dispositifs de remplissage des accumulateurs avec des moyens de commande électriques
• B60T 15/02 - Valves d'application et de relâchement des freins
• B60T 13/66 - Commande électrique des systèmes de freins à fluide sous pression
• B60T 13/68 - Commande électrique des systèmes de freins à fluide sous pression par valves commandées électriquement
• F15B 21/08 - Systèmes de servomoteur comportant des moyens de commande actionnés électriquement
• F15B 13/044 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par des moyens commandés électriquement, p. ex. des solénoïdes, des moteurs à couple
• B60T 15/36 - Autres dispositifs de commandes ou valves caractérisés par des fonctions définies

Abrégé

A hydraulic system is provided. The hydraulic system includes a pump, a load sense conduit, a tank conduit, a function workport, and a function control valve. The hydraulic system further includes a function poppet valve arranged between the function workport and the function control valve and having a function poppet vent passage, and a system control valve arranged downstream of the function control valve. The system control valve is biased into a first position where fluid communication between the function poppet vent passage and the tank conduit is prevented and fluid communication between the load sense conduit and the tank conduit is provided. The system control valve is selectively movable to a second position where fluid communication between the function poppet vent passage and the tank conduit is allowed and fluid communication between the load sense conduit and the tank conduit is prevented.

Classes IPC  ?

• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique
• F15B 9/09 - Servomoteurs à asservissement, c.-à-d. dans lesquels la position de l'organe commandé correspond à celle de l'organe qui commande les servomoteurs étant du type à mouvement possible alternatif ou oscillant commandés par des clapets agissant sur l'alimentation de fluide ou sur l'orifice de sortie du fluide du servomoteur avec moyens de commande électriques
• F15B 13/044 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par des moyens commandés électriquement, p. ex. des solénoïdes, des moteurs à couple

Abrégé

Systems and methods for control of multi-function hydraulic commands of a multi -function electrohydraulic system are provided. In one aspect, a system for hydraulic control includes a first function in fluid communication with a first electrohydraulic control valve and a second function in fluid communication with a second electrohydraulic control valve. The system includes a controller in communication with the first electrohydraulic control valve and the second electrohydraulic control valve. The controller can be configured to receive an input target command, determine an achievable function rate based on the input target command, where the achievable function rate maintains a proportional relationship between the input target command and the achievable function rate. The controller can also map the achievable function rate to an output command based on a predetermined relationship between the achievable function rates and the output commands and supply the output command to the first and second electrohydraulic valves.

Classes IPC  ?

• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• E02F 3/43 - Commande de la position du plongeur ou de l'augeCommande de la succession des opérations d'entraînement
• F15B 11/042 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie pour commander la vitesse par des moyens de commande situés dans le circuit d'alimentation
• F15B 21/00 - Caractéristiques communes des systèmes de manœuvre utilisant des fluidesSystèmes de manœuvre à pression ou parties constitutives de ces systèmes, non couverts par l'un quelconque des autres groupes de la présente sous-classe

Abrégé

Systems and methods for electrohydraulic valve calibration are provided. In one aspect, a calibration circuit includes a calibration conduit isolated from a supply conduit, a first calibration orifice configured to provide fluid communication between the calibration conduit and a fluid source, and a second calibration orifice arranged in series with the first calibration orifice. The second calibration orifice is on a spool of a electrohydraulic control valve and is configured to selectively provide fluid communication between the calibration conduit and a low pressure source. The calibration circuit further includes a pressure sensor configured to measure a pressure in the calibration conduit between the first calibration orifice and the second calibration orifice. The second calibration orifice is isolated from the at least one workport of the electrohydraulic control valve.

Classes IPC  ?

• F16K 37/00 - Moyens particuliers portés par ou sur les soupapes ou autres dispositifs d'obturation pour repérer ou enregistrer leur fonctionnement ou pour permettre de donner l'alarme
• F16K 31/42 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide et au moyen d'organes actionnés électriquement dans les canalisations d'entrée ou de refoulement du moteur à fluide
• F15B 19/00 - Test des systèmes ou appareils de manœuvre utilisant la pression d'un fluide, dans la mesure où ils ne sont pas prévus ailleurs

Abrégé

Systems and methods for calibration of an electrohydraulic control valve are provided. In one aspect, a method for calibrating an electrohydraulic control valve includes providing fluid communication between the pump and the reservoir through a bypass calibration orifice. The bypass calibration orifice defines a known restriction. The method further includes measuring a pressure drop across the bypass calibration orifice, commanding the electrohydraulic control valve, calculating a pressure drop across the electrohydraulic control valve, recording the command applied to the electrohydraulic control valve corresponding with the calculated pressure drop across the electrohydraulic control valve, and calibrating the electrohydraulic control valve based on at least two of the recorded command, the known restriction, the measured pressure drop across the bypass calibration orifice, and the calculated pressure drop across the electrohydraulic control valve.

Classes IPC  ?

• G05D 16/20 - Commande de la pression d'un fluide caractérisée par l'utilisation de moyens électriques
• F16K 37/00 - Moyens particuliers portés par ou sur les soupapes ou autres dispositifs d'obturation pour repérer ou enregistrer leur fonctionnement ou pour permettre de donner l'alarme
• F15B 19/00 - Test des systèmes ou appareils de manœuvre utilisant la pression d'un fluide, dans la mesure où ils ne sont pas prévus ailleurs
• G01F 25/00 - Test ou étalonnage des appareils pour la mesure du volume, du débit volumétrique ou du niveau des liquides, ou des appareils pour compter par volume

Abrégé

A hydraulic control valve assembly to be integrated into a pressure compensated load sensing system including a fluid source is provided. The hydraulic control valve assembly includes a first working unit to control a first hydraulic function of a machine. The first working unit includes a first directional and return flow control in the form of a first spool, a first function flow control to selectively communicate a working pressure of the first function to the fluid source, and a first downstream flow control. The hydraulic control valve assembly further includes a second working unit arranged downstream of the first working unit. The second working unit to control a second hydraulic function of the machine. The first downstream flow control to selectively restrict a flow a fluid from the fluid source to the second working unit.

Classes IPC  ?

• F15B 11/16 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs

Abrégé

A system and method for machinery performing work with hydraulic actuators (226). Radial hydraulic pumps (210a-210f) are aligned end-to-end along a common driveshaft axis (218) to form a multi-pump assembly (220) having a plurality of piston/cylinder units (222a- 222c) extending in a radial direction (R). Two or more piston/cylinder units (222a- 222c) are associated with one another to form multiple piston/cylinder groups (5a-5f, 83b-83e). A plurality of control valves (6a-6f, 86b-86e) combines individual output flows from the two or more associated piston/cylinder units into respective common output flows for each respective piston/cylinder group. A plurality of flow control devices (T1-T4, 186a-186f) varies the common output flow from each respective piston/cylinder group by throttling inlet flow to the two or more associated piston/cylinder units in each respective piston/cylinder group. Each respective common output flow is directed from each respective piston/cylinder group to a hydraulic actuator (A1, 88b-88e) on the heavy machinery to control its direction of movement.

Classes IPC  ?

• F04B 1/053 - "Machines" ou pompes multicylindres caractérisées par le nombre ou la disposition des cylindres ayant des cylindres disposés en étoile ou en éventail avec des éléments actionnants ou actionnés aux extrémités intérieures des cylindres
• F04B 1/06 - Commande
• F04B 49/00 - Commande des "machines", pompes ou installations de pompage ou mesures de sécurité les concernant non prévues dans les groupes ou présentant un intérêt autre que celui visé par ces groupes
• F04B 49/22 - Commande des "machines", pompes ou installations de pompage ou mesures de sécurité les concernant non prévues dans les groupes ou présentant un intérêt autre que celui visé par ces groupes par clapets
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques

Abrégé

A system and method for machinery performing work with hydraulic actuators. Radial hydraulic pumps are aligned end-to-end along a common driveshaft axis to form a multi-pump assembly having a plurality of piston/cylinder units extending in a radial direction. Two or more piston/cylinder units are associated with one another to form multiple piston/cylinder groups. A plurality of control valves combines individual output flows from the two or more associated piston/cylinder units into respective common output flows for each respective piston/cylinder group. A plurality of flow control devices varies the common output flow from each respective piston/cylinder group by throttling inlet flow to the two or more associated piston/cylinder units in each respective piston/cylinder group. Each respective common output flow is directed from each respective piston/cylinder group to a hydraulic actuator on the heavy machinery to control its direction of movement.

Classes IPC  ?

• F04B 1/053 - "Machines" ou pompes multicylindres caractérisées par le nombre ou la disposition des cylindres ayant des cylindres disposés en étoile ou en éventail avec des éléments actionnants ou actionnés aux extrémités intérieures des cylindres
• F04B 1/04 - "Machines" ou pompes multicylindres caractérisées par le nombre ou la disposition des cylindres ayant des cylindres disposés en étoile ou en éventail
• F04B 49/22 - Commande des "machines", pompes ou installations de pompage ou mesures de sécurité les concernant non prévues dans les groupes ou présentant un intérêt autre que celui visé par ces groupes par clapets
• F04B 53/16 - Carcasses d'enveloppeCylindresChemises de cylindre ou culassesConnexions des tubulures pour fluide
• F15B 11/08 - Systèmes de servomoteurs dépourvus d'asservissement avec un seul servomoteur
• F15B 11/16 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• F04B 1/06 - Commande
• F04B 49/00 - Commande des "machines", pompes ou installations de pompage ou mesures de sécurité les concernant non prévues dans les groupes ou présentant un intérêt autre que celui visé par ces groupes

Abrégé

A hydraulic system and method for using the same are provided. The hydraulic system includes a pump, a first actuator having a first head chamber and a first rod chamber, and a second actuator having a second head chamber and a second rod chamber. The hydraulic system further includes a first control valve and a second control valve. The second control valve to selectively provide regeneration fluid flow from the first rod chamber to the first head chamber in response to a first function command is less than a first function command limit, a second function command is greater than a second function command limit, and a second function load is greater than a second function load limit.

Classes IPC  ?

• F15B 11/024 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie au moyen d'une liaison différentielle des circuits du servomoteur, p. ex. circuits à récupération de fluide
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques

Abrégé

Systems and methods use selective regeneration to aid in controllability and efficiency of a hydraulic circuit. A regeneration deactivation valve can react to a differential pressure when the function is in free air and at risk of cavitating or when then function is doing positive work and needs to be efficient. When the function is at risk of cavitating, the regeneration deactivation valve can react to the potential for cavitation and the regeneration deactivation valve closes so the function regenerates. The regeneration deactivation valve can also react when the function is not at a risk of cavitating and can open up allowing the function to move with more power and efficiency.

Classes IPC  ?

• F15B 11/024 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie au moyen d'une liaison différentielle des circuits du servomoteur, p. ex. circuits à récupération de fluide
• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique

Abrégé

An apparatus has a pilot-operated spool valve connecting first and second work passages selectively to a supply conduit and a tank conduit. A first check valve normally allows fluid flow only in one direction from the first work passage to a first workport and when pilot-operated allows bidirectional fluid flow. A second check valve normally allows fluid flow only from the second work passage to a second workport and when pilot-operated allows bidirectional fluid flow. A first pilot valve selectively applies pressure to one end of the spool and to pilot operate the first check valve. A second pilot valve selectively applies pressure to another end of the spool and to pilot operate the second check valve. When fluid drains from a workport to the tank conduit, the associated check valve operates to maintain a predefined pressure in the first or second work passage through which that fluid flows.

Classes IPC  ?

• F15B 13/043 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide avec clapets-pilotes commandés électriquement
• F15B 13/01 - Clapets de blocage ou autres dispositifs de détente
• F15B 13/02 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs

Abrégé

A pump system has a piston pump. The piston pump has a cylinder block with an inlet port, an outlet port, and a plurality of cylinders. Each cylinder in the plurality of cylinders is connected to the inlet port by an inlet passage and to the outlet port by an outlet passage. The piston pump has a plurality of pistons disposed in the plurality of cylinders. A drive shaft drives the pistons within the cylinders. A throttle member independently throttles flow in each inlet passage. The pump system has an electrohydraulic actuator governing movement of the throttle member.

Classes IPC  ?

• F04B 1/04 - "Machines" ou pompes multicylindres caractérisées par le nombre ou la disposition des cylindres ayant des cylindres disposés en étoile ou en éventail
• F15B 11/02 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie

Abrégé

A pump system has a piston pump. The piston pump has a cylinder block with an inlet port, an outlet port, and a plurality of cylinders. Each cylinder in the plurality of cylinders is connected to the inlet port by an inlet passage and to the outlet port by an outlet passage. The piston pump has a plurality of pistons disposed in the plurality of cylinders. A drive shaft drives the pistons within the cylinders. A throttle member independently throttles flow in each inlet passage. The pump system has an electrohydraulic actuator governing movement of the throttle member.

Classes IPC  ?

• F04B 49/22 - Commande des "machines", pompes ou installations de pompage ou mesures de sécurité les concernant non prévues dans les groupes ou présentant un intérêt autre que celui visé par ces groupes par clapets
• F04B 1/053 - "Machines" ou pompes multicylindres caractérisées par le nombre ou la disposition des cylindres ayant des cylindres disposés en étoile ou en éventail avec des éléments actionnants ou actionnés aux extrémités intérieures des cylindres
• F04B 49/03 - Commande d'arrêt, de démarrage, de décharge ou de ralenti par clapets

Abrégé

A hydraulic system has a pump that furnishes pressurized fluid to a supply node connected to a plurality of functions. Each function includes hydraulic actuator and a control valve assembly through which fluid flows both from the supply node to the hydraulic actuator and from the hydraulic actuator to a return line. A control method involves receiving a plurality of commands, each designating desired operation of a function. Each command is separately used to derive a flow value designating an amount of flow for the respective function, a load value indicating a load magnitude related to the respective function, and a pressure value denoting a supply pressure for the respective function. Then, the control valve assembly for each given hydraulic function is operated in response to the flow and load values for that function and in response to the pressure value that is greatest among the plurality of functions.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres
• E02F 3/96 - DraguesEngins de terrassement entraînés mécaniquement avec des dispositions pour l'emploi alterné d'éléments de creusement différents
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques
• F15B 11/042 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie pour commander la vitesse par des moyens de commande situés dans le circuit d'alimentation

Abrégé

A radial piston pump has a plurality of cylinders within which pistons reciprocally move. Each cylinder is connected to a first port by an inlet passage that has an inlet check valve, and is connected to a second port by an outlet passage that has an outlet check valve. A throttling plate extends across the inlet passages and has a separate aperture associated with each inlet passage. Rotation of the throttling plate varies the degree of alignment of each aperture with the associated inlet passage, thereby forming variable orifices for altering displacement of the pump. Uniquely shaped apertures specifically affect the rate at which the variable orifices close with throttle plate movement, so that the closure rate decreases with increased closure of the variable orifices.

Classes IPC  ?

• F04B 1/06 - Commande
• F04B 49/03 - Commande d'arrêt, de démarrage, de décharge ou de ralenti par clapets
• F04B 53/10 - ClapetsAgencement des clapets

Abrégé

A system (20) has a variable displacement pump (50) that supplies pressurized fluid to power a plurality of hydraulic functions (31-36). Each hydraulic function has a control valve (51-56) with a variable source orifice (64) controlling fluid flow between the pump and a flow summation node (74), and a variable metering orifice (75) controlling fluid flow between the flow summation node and a hydraulic actuator (21-26). Variable bypass orifices (8a- 8f) in the control valves are connected in series between the flow summation node and a tank (48). As the metering orifice in a control valve enlarges, the source orifice enlarges and the bypass orifice shrinks. This alters pressure at the flow summation node, which is used to control the output of the pump. Components are provided to give selected hydraulic functions different levels of priority with respect to consuming fluid flow from the pump.

Classes IPC  ?

• F15B 11/16 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs
• F15B 11/17 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs utilisant plusieurs pompes

Abrégé

A valve assembly (40) has a flow summation node (74) coupled to a displacement control (39) port of the first pump (50). Each valve (41-47) in the assembly has a variable metering orifice (75) controlling flow from an inlet (70) to a hydraulic actuator and has a variable source orifice (64) conveying fluid from a supply conduit (58) to a flow summation node. The source orifice enlarges as the metering orifice shrinks. Each valve includes a variable bypass orifice (80) and the bypass orifices of all the control valves are connected in series forming a bypass passage (85) between a bypass node (55) and a tank (53). The bypass node is coupled to the flow summation node and receives fluid from a second pump (51). At each valve, a source check valve (68) conveys fluid from the supply conduit to the inlet and a bypass supply check valve (89) conveys fluid from the bypass passage to the inlet.

Classes IPC  ?

• F15B 11/16 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs
• F15B 11/17 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs utilisant plusieurs pompes
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques

Abrégé

A hydraulic system includes a first pump and a plurality of valves that control fluid flow from the first pump to several actuators. Variable source orifices in the control valves are connected in parallel between the first pump and a node, and variable bypass orifices in the control valves are connected in series between the node and a tank. Pressure at the node controls displacement of the first pump. Each control valve also has a metering orifice for varying fluid flow between the node and one of the actuators. A hydrostatic pump-motor, coupled between two ports of a given actuator, is driven in a motoring mode by fluid exiting one of those ports. In a pumping mode, the hydrostatic pump-motor forces lower pressure fluid exhausting from one port into the other port of the given actuator.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres

Abrégé

The hitch on a vehicle is moved by a hydraulic actuator. A method for controlling the hydraulic actuator defines a draft force setpoint in response to separately averaging two forces acting on lateral sides of the hitch, while operating in a configuration mode. During regular operation, a draft load is calculated from sensing those two forces and deriving a draft force error from difference between the draft load and the draft force setpoint. The draft force error is used to control fluid flow to and from the hydraulic actuator. One aspect of the control method derates the draft force error as the hitch moves beyond a predefined threshold position.

Classes IPC  ?

• G06F 7/70 - Méthodes ou dispositions pour effectuer des calculs en utilisant une représentation numérique non codée, c.-à-d. une représentation de nombres sans baseDispositifs de calcul utilisant une combinaison de représentations de nombres codées et non codées utilisant des trains d'impulsions stochastiques, c.-à-d. des impulsions apparaissant au hasard et dont la moyenne des taux d'impulsion représente des nombres
• G06F 19/00 - Équipement ou méthodes de traitement de données ou de calcul numérique, spécialement adaptés à des applications spécifiques (spécialement adaptés à des fonctions spécifiques G06F 17/00;systèmes ou méthodes de traitement de données spécialement adaptés à des fins administratives, commerciales, financières, de gestion, de surveillance ou de prévision G06Q;informatique médicale G16H)
• G06G 7/00 - Dispositifs dans lesquels l'opération de calcul est effectuée en faisant varier des grandeurs électriques ou magnétiques
• G06G 7/76 - Calculateurs analogiques pour des procédés, des systèmes ou des dispositifs spécifiques, p. ex. simulateurs de circulation, p. ex. circulation routière

Abrégé

A system for operating a single acting hydraulic cylinder includes a directional valve that has one extreme position in which a workport is connected to a tank return conduit, another extreme position where the workport is connected to a pump supply conduit, and a closed intermediate a position where the workport is disconnected from both the pump and the tank. The directional valve is pilot operated and is biased toward the one extreme position by a spring. An electrically operated primary applies pilot pressure to the directional valve alternately from the pump supply conduit and the tank return conduit. A pilot operated check valve has a first state which restricts fluid flow only from the workport toward the chamber and a second state in which fluid can flows from the chamber to the workport. The system has a pressure compensation that also provides self priming of the directional valve.

Classes IPC  ?

• F15B 11/04 - Systèmes comportant essentiellement des moyens particuliers pour commander la vitesse ou la puissance d'un organe de sortie pour commander la vitesse
• A01B 63/10 - Dispositifs ou agencements de levage ou de réglage pour machines ou instruments agricoles pour instruments montés sur tracteurs à manœuvre hydraulique ou pneumatique
• F15B 11/08 - Systèmes de servomoteurs dépourvus d'asservissement avec un seul servomoteur

Abrégé

Fluid from two pumps is allocated to a plurality of hydraulic actuators based on a plurality of flow commands, each specifying a desired amount of flow to be applied to a different hydraulic actuator. For a given hydraulic actuator, the allocation involves (1) determining an apportionment of the desired amount of flow, if no other hydraulic actuator is active, and (2) altering the apportionment in response to all the plurality of flow commands, and (3) using the altered apportionment to determine a first amount of the flow for one pump to provide and a second amount of the flow for the other pump to provide. The process is repeated for all the hydraulic actuators. Supply valves for each hydraulic actuator are controlled by the associated first and second amounts and each pump is controlled in response to either the first or second amounts for all the hydraulic actuators.

Classes IPC  ?

• F15B 13/02 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs
• F15B 11/17 - Systèmes de servomoteurs dépourvus d'asservissement avec plusieurs servomoteurs utilisant plusieurs pompes
• E02F 9/22 - Entraînements hydrauliques ou pneumatiques

Abrégé

A high efficiency diametrically compact, radial oriented piston hydraulic machine includes a cylinder block with a plurality of cylinders coupled to a first port by a first valve and to a second port by a second valve. A drive shaft with an eccentric cam, is rotatably received in the cylinder block and a cam bearing extend around the eccentric cam. A separate piston is slideably received in each cylinder. A piston rod is coupled at one end to the piston and a curved shoe at the other end abuts the cam bearing. The curved shoe distributes force from the piston rod onto a relatively large area of the cam bearing and a retaining ring holds each shoe against the cam bearing. The cylinder block has opposing ends with a side surface there between through which every cylinder opens. A band engages the side surface closing the openings of the cylinders.

Classes IPC  ?

• F04B 27/04 - Pompes multicylindres spécialement adaptées aux fluides compressibles et caractérisées par le nombre ou la disposition des cylindres ayant des cylindres disposés en étoile ou en éventail

Abrégé

An apparatus includes a plurality of cylinders with a separate piston slideably received in each cylinder and engaging an eccentric cam. Each cylinder chamber is coupled to a shared first fluid port by a separate selectively reversible first check valve and to a shared second fluid port by a separate selectively reversible second check valve. Each of those check valves has a control chamber to which pressure from either the associated cylinder or the respective port is dynamical applied to configure the apparatus in different operating modes. In different operating modes the apparatus acts as a bidirectional pump or as a hydraulic motor. Also properly configuring selected first and second check valves deactivates an individual cylinder, while other cylinders remain active.

Classes IPC  ?

• F16K 31/12 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide

Abrégé

An apparatus includes a first plurality of cylinders, each coupled to a shared first port by a separate first valve and to a shared second port by a separate second valve. Each first and second valve has a chamber to which pressure from either the associated cylinder or the respective port is dynamically applied to select different operating modes. Each one of a second plurality of cylinders is coupled to the first port by a separate third valve and to a shared third port by a separate fourth valve. Each third and fourth valve has a chamber to which pressure from either the associated cylinder or the respective port is dynamically applied to select different operating modes. Selecting an operating mode enables the apparatus to act as a bidirectional pump or a hydraulic motor. Selectively controller the valves can deactivate an individual cylinder, while other cylinders remain active.

Classes IPC  ?

• F04B 1/04 - "Machines" ou pompes multicylindres caractérisées par le nombre ou la disposition des cylindres ayant des cylindres disposés en étoile ou en éventail

Abrégé

A control valve includes a main poppet that moves in response to pressure in a primary control chamber and thereby controls the flow of fluid through a valve seat between first and second ports. A passageway extends between the second port and the primary control chamber and includes a variable flow restriction that decreases as the main poppet moves away from the valve seat. An electrohydraulic pilot valve has a pilot poppet which controls fluid flow from the primary control chamber to the first port in response to pressure in a pilot control chamber. A sub-pilot valve selectively releases pressure in the pilot control chamber to operate the pilot poppet to open and close a path between the inlet and the outlet. Using an electrohydraulic pilot valve enables the main poppet to operate quickly in controlling large fluid flow rates. Unidirectional and bidirectional versions of the control valve are described.

Classes IPC  ?

• F16K 31/12 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide

Abrégé

A user input device is provided for a hydraulic system that has a source of pressurized fluid and a tank. The user input device includes a body with a supply passage for receiving the pressurized fluid, a tank passage for connection to the tank, and a first chamber. A handle is pivotally attached to the body and operates one or more valves within the body. In a preferred embodiment, the handle can be pivoted independently about two orthogonal axis with separate pairs of valves operated by movement about each axis. In response to the position of the handle, each valve connects a separate chamber alternately to either the supply passage or the tank passage and different pressure sensor produces an electrical signal indicating a level of pressure in the chamber of each valve. Thus an electrical signal is produced from each valve to indicate motion of the handle.

Classes IPC  ?

• F15B 13/042 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide
• F15B 13/14 - Mesures particulières donnant à l'opérateur une perception tactile immédiate de réponse du dispositif entraîné
• G05G 9/047 - Mécanismes de commande manuelle équipés d'un seul organe de commande travaillant avec plusieurs organes commandés, p. ex. en sélection ou simultanément l'organe de commande étant manœuvré de différentes manières indépendantes, chacune de ces manœuvres individuelles entraînant un seul organe commandé dans lesquels la manœuvre de l'organe de commande peut être effectuée de plusieurs manières simultanément l'organe de commande étant manœuvré à la main autour d'axes orthogonaux, p. ex. manches à balai

Abrégé

A vehicle with a load sensing hydraulic control system is disclosed.

Classes IPC  ?

• F15B 13/04 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique

Abrégé

A user input device is provided for a hydraulic system that has a source of pressurized fluid and a tank. The user input device includes a body with a supply passage (40) for receiving the pressurized fluid, a tank passage (42) for connection to the tank, and a first chamber (44). A handle (19) is pivotally attached to the body and operates one or more valves within the body. In a preferred embodiment, the handle can be pivoted independently about two orthogonal axis with separate pairs of valves (21,22) operated by movement about each axis. In response to the position of the handle, each valve (21,22) connects a separate chamber (44,58) alternately to either the supply passage (40) or the tank passage (42) and different pressure sensor (61,62) produces an electrical signal indicating a level of pressure in the chamber (44,58) of each valve. Thus an electrical signal is produced from each valve to indicate motion of the handle.

Classes IPC  ?

• F15B 13/042 - Dispositifs de distribution ou d'alimentation du fluide caractérisés par leur adaptation à la commande de servomoteurs pour utilisation avec un servomoteur unique actionnés par la pression du fluide

Abrégé

A method for operating an electrohydraulic valve initially derives a characterization value that denotes how magnetic hysteresis affects valve operation. Upon receiving a command that designates a desired magnitude of electric current to be applied to the electrohydraulic valve, that command is modified based on the characterization value to compensate for the magnetic hysteresis. The modified command then is employed to apply electric current to the electrohydraulic valve.

Classes IPC  ?

• F16K 51/00 - Autres détails non particuliers aux types de soupapes ou clapets ou autres appareils d'obturation

Abrégé

A pilot operated valve has a main poppet that selectively controls flow of fluid between first and second ports in response to pressure in a control chamber on one side of the main poppet. The main poppet has an aperture extending between the control chamber and the first port. A pilot piston slides within the aperture and has the pilot passage with a pilot orifice and a first disk spring biases the pilot piston with respect to the main poppet. A pilot valve element selectively engages the pilot orifice to open and close the pilot passage and thereby controls motion of the main poppet. Forces from the first disk spring and a pressure differential between control and pilot chambers alter a position of the pilot valve seat with respect to the main poppet. The change in position compensates for effects on valve operation due to variation of the pressure at the two ports.

Classes IPC  ?

• F16K 31/12 - Moyens de fonctionnementDispositifs de retour à la position de repos actionnés par un fluide

Abrégé

A machine member driven by a hydraulic actuator may oscillate, or wag, when the hydraulic actuator decelerates or stops. The degree of oscillation is a function of the machine member's ability to track a deceleration command, which ability varies with changes in the position of the machine member and the load force acting thereon. To reduce the oscillation, a command that controls operation of the hydraulic actuator is filtered using a filter function that changes with the machine member's load. The load force exerted on the hydraulic actuator which in turn can be designated by fluid pressure that results from the hydraulic actuator. Preferably, the frequency of the filter function is varied inversely with the magnitude of the actuator load force.

Classes IPC  ?

• F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c.-à-d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres

Produits et services

Valves and pumps; hydraulic control apparatus; control apparatus for use therewith, parts and fittings of the foregoing goods included in class 7. Electrically operated machine valves, electro-hydraulic valves, electro-hydraulic pilot pressure controllers.

Produits et services

Hydraulic control valves being part of a hydraulic control system. Electric controls, microprocessors, and input devices to provide signals to microprocessors, all being part of a hydraulic control system.

Produits et services

hydraulic control system consisting of hydraulic control valves, electric controls, microprocessors, and input devices to provide signals to microprocessors

Produits et services

Hydraulic control valves. Electric controls for controlling hydraulic control valves.

Produits et services

Hydraulic control valves [and electric controls for controlling hydraulic control valves]

Produits et services

(1) Selector and control valves, check valves, relief valves, swivel line connectors. (2) Cylinder pumps and combination pump, valve and reservoir units.

Produits et services

(1) Selector and control valves, check valves, relief valves, swivel line connectors, cylinder pumps and combination pump, valve and reservoir units.

Produits et services

Selector and Control Valves [, Check Valves, Relief Valves, Swivel Line Connectors ]