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.
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.
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.
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.
G01M 3/22 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for valves
G01M 3/38 - Investigating fluid tightness of structures by using light
5.
SYSTEMS AND METHOD FOR HYDRAULIC SYSTEMS WITH PRE-COMPENSATION DEVICE
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.
F15B 11/042 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed by means in the feed line
F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors
F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
F15B 13/042 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
F15B 13/08 - Assemblies of units, each for the control of a single servomotor only
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.
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
F15B 13/043 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
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.
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.
F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
F15B 13/043 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
F15B 21/045 - Compensating for variations in viscosity or temperature
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.
F15B 13/01 - Locking-valves or other detent devices
F15B 13/043 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
10.
SYSTEMS AND METHODS FOR STEERING CONTROL FOR A HYDRAULIC MACHINE
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.
B62D 1/00 - Steering controls, i.e. means for initiating a change of direction of the vehicle
B62D 1/22 - Alternative steering-control elements, e.g. for teaching purposes
B62D 1/24 - Steering controls, i.e. means for initiating a change of direction of the vehicle not vehicle-mounted
B62D 1/28 - Steering controls, i.e. means for initiating a change of direction of the vehicle not vehicle-mounted non-mechanical
B62D 5/00 - Power-assisted or power-driven steering
B62D 5/06 - Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
A01B 69/00 - Steering of agricultural machines or implementsGuiding agricultural machines or implements on a desired track
B62D 6/00 - Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
B62D 6/08 - Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to input torque
11.
SYSTEMS AND METHODS FOR A MODULAR HYDRAULIC CONTROL VALVE
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.
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.
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.
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.
09 - Scientific and electric apparatus and instruments
Goods & 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.
09 - Scientific and electric apparatus and instruments
Goods & 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
17.
Systems and methods for determining control capabilities on an off-highway vehicle
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.
09 - Scientific and electric apparatus and instruments
Goods & Services
Hydraulic valves, selector and control valves. Electrohydraulic valves; electronic actuators to actuate a
hydraulic valves as a type of solenoid force motor.
09 - Scientific and electric apparatus and instruments
Goods & 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
09 - Scientific and electric apparatus and instruments
Goods & Services
(1) Electronic controllers for use in vehicles to control electrohydraulic valves and electronically controlled pumps to regulate the flow of gases and liquids
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.
F15B 11/028 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the actuating force
F15B 13/042 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
F16K 17/04 - Safety valvesEqualising valves opening on surplus pressure on one sideSafety valvesEqualising valves closing on insufficient pressure on one side spring-loaded
23.
HYDRAULIC SYSTEMS AND METHODS FOR PRESSURE CONTROL
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.
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
F15B 13/042 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
09 - Scientific and electric apparatus and instruments
Goods & 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
09 - Scientific and electric apparatus and instruments
Goods & 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
27.
Hydraulic control systems and methods using multi-function dynamic scaling
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.
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.
F16K 31/124 - Operating meansReleasing devices actuated by fluid the fluid acting on a piston servo actuated
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
F15B 13/043 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
F16K 31/40 - Operating meansReleasing devices actuated by fluid in which fluid from the conduit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors
29.
SYSTEMS AND METHODS FOR DETERMINING CONTROL CAPABILITIES ON AN OFF-HIGHWAY VEHICLE
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.
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.
F15B 11/028 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the actuating force
F15B 1/033 - Installations or systems with accumulators having accumulator charging devices with electrical control means
B60T 13/66 - Electrical control in fluid-pressure brake systems
B60T 13/68 - Electrical control in fluid-pressure brake systems by electrically-controlled valves
F15B 21/08 - Servomotor systems incorporating electrically- operated control means
F15B 13/044 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
B60T 15/36 - Other control devices or valves characterised by definite functions
31.
Systems and methods for selective enablement of hydraulic operation
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.
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
F15B 9/09 - Servomotors with follow-up action, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means
F15B 13/044 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
32.
HYDRAULIC CONTROL SYSTEMS AND METHODS USING MULTI-FUNCTION DYNAMIC CONTROL
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.
E02F 3/43 - Control of dipper or bucket positionControl of sequence of drive operations
F15B 11/042 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed by means in the feed line
F15B 21/00 - Common features of fluid actuator systemsFluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
33.
Systems and methods for electrohydraulic valve calibration
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.
F16K 37/00 - Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
F16K 31/42 - Operating meansReleasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor
F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere
34.
Systems and methods for electrohydraulic valve calibration
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.
G05D 16/20 - Control of fluid pressure characterised by the use of electric means
F16K 37/00 - Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere
G01F 25/00 - Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
35.
Metered fluid source connection to downstream functions in PCLS systems
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.
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.
F04B 1/053 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
F04B 49/22 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by means of valves
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.
F04B 1/053 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
F04B 1/04 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
F04B 49/22 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by means of valves
F04B 53/16 - CasingsCylindersCylinder liners or headsFluid connections
F15B 11/08 - Servomotor systems without provision for follow-up action with only one servomotor
F15B 11/16 - Servomotor systems without provision for follow-up action with two or more servomotors
F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
38.
Systems and methods for selectively engaged regeneration of a hydraulic system
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.
F15B 11/024 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
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.
F15B 11/024 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
F15B 13/04 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
40.
Hydraulic valve assembly with tank return flow compensation
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.
F15B 13/043 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
F15B 13/01 - Locking-valves or other detent devices
F15B 13/02 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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.
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.
F04B 49/22 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by means of valves
F04B 1/053 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
F04B 49/03 - Stopping, starting, unloading or idling control by means of valves
43.
Hydraulic system with open loop electrohydraulic pressure compensation
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.
F16D 31/02 - Fluid couplings or clutches with pumping sets of the volumetric type, i.e. in the case of liquid passing a predetermined volume per revolution using pumps with pistons or plungers working in cylinders
E02F 3/96 - DredgersSoil-shifting machines mechanically-driven with arrangements for alternate use of different digging elements
F15B 11/042 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed by means in the feed line
44.
Hydraulic piston pump with a variable displacement throttle mechanism
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.
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.
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.
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.
F16D 31/02 - Fluid couplings or clutches with pumping sets of the volumetric type, i.e. in the case of liquid passing a predetermined volume per revolution using pumps with pistons or plungers working in cylinders
48.
Draft control method for operating an earth moving machine
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.
G06F 7/70 - Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radixComputing devices using combinations of denominational and non-denominational quantity representations using stochastic pulse trains, i.e. randomly occurring pulses the average pulse rates of which represent numbers
G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
G06G 7/00 - Devices in which the computing operation is performed by varying electric or magnetic quantities
G06G 7/76 - Analogue computers for specific processes, systems, or devices, e.g. simulators for traffic
49.
Valve control valve circuit for operating a single acting hydraulic cylinder
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.
F15B 11/04 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed
A01B 63/10 - Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
F15B 11/08 - Servomotor systems without provision for follow-up action with only one servomotor
50.
Command based method for allocating fluid flow from a plurality of pumps to multiple hydraulic functions
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.
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.
F04B 27/04 - Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
52.
FLUID WORKING MACHINE WITH SELECTIVELY REVERSIBLE CHECK VALVE ASSEMBLIES AND METHOD OF OPERATION
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.
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.
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.
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.
F15B 13/042 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
F15B 13/14 - Special measures for giving the operator by sense of touch the immediate response of the actuated device
G05G 9/047 - Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
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.
F15B 13/042 - Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
58.
Electrohydraulic valve control circuit with magnetic hysteresis compensation
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.
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.
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.
F16D 31/02 - Fluid couplings or clutches with pumping sets of the volumetric type, i.e. in the case of liquid passing a predetermined volume per revolution using pumps with pistons or plungers working in cylinders
09 - Scientific and electric apparatus and instruments
Goods & 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.
09 - Scientific and electric apparatus and instruments
Goods & 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.
09 - Scientific and electric apparatus and instruments
Goods & Services
hydraulic control system consisting of hydraulic control valves, electric controls, microprocessors, and input devices to provide signals to microprocessors
(1) Selector and control valves, check valves, relief valves, swivel line connectors.
(2) Cylinder pumps and combination pump, valve and reservoir units.
