A direction control valve group for a construction machine that controls an amount of pressure oil supplied to a hydraulic actuator from a hydraulic pump that discharges the pressure oil is provided. The direction control valve includes a cylinder port that supplies the pressure oil to the hydraulic actuator, a bridge passage that is switchably connected and disconnected to the cylinder port according to a change in position of a first spool, and an internal passage that supplies the pressure oil discharged from the hydraulic pump to the bridge passage. The first spool is provided in the internal passage.

Proposed are directional control hydraulic valves and a system including the same, the system including: a first valve controlling a flow of a fluid flowing thereinto from a first input port by being interlocked with a solenoid valve that is switched to an excited (on) state or non-excited (off) state; and a second valve connected to the first valve and controlling a flow of the fluid flowing thereinto from the first valve by a fluid flowing thereinto from a second input port or a third input port, wherein at least a part of the fluid having been passed through the first valve is discharged through a first output port and then flows into the second input port or the third input port. In addition, the system including at least two directional control valves may be provide, whereby multiplexing of the system may be implemented.

Disclosed herein are embodiments of a servo-control system comprising at least one pneumatic actuator comprising a movable member, at least one proportional pneumatic valve configured to control fluid flow between the at least one pneumatic actuator and a pressurized fluid supply or a vent, a plurality of pressure sensors each configured to independently measure pressure in a respective supply line to the at least one pneumatic actuator, at least one position sensor configured to measure a position of the moveable member, and a controller. The controller is configured to determine a control signal based at least in part on pressure measurements of the plurality of pressure sensors and a position measurement of the at least one position sensor, and apply the control signal to at least one proportional pneumatic valve to move the movable member to a target position.

A machine control system can store model weights determined via machine learning using a training dataset correlating preset hydraulic valve displacements to measured movement parameters of a machine component. The machine control system can receive an input command for the component and machine state data from machine sensors. A control mapping model can use the model weights to map a combination of the input command and the machine state data into a predicted displacement of the hydraulic valve that causes movement of the component in response to the input command.

A vehicle drive system, comprises a battery, a power unit in a housing, which itself comprises at least one electric motor/generator, capable of being driven as a motor by the battery or of charging the battery as a generator, at least one hydraulic motor/pump, capable of being driven by the electric motor/generator to pressurize hydraulic fluid, or of being driven by pressurized hydraulic fluid to power the motor generator as a generator, a hydraulic rail communicating the pump, a directional control valves communicating with the hydraulic rail, at least one accumulator for storing pressurized hydraulic fluid, wheel drives capable of being driven by pressurized hydraulic fluid, a hydraulic circuit connecting the directional control valves of the motor housing to the accumulator and wheel drives, and a control system for controlling the operation of the battery, power unit and wheel drives.

Hydraulic systems and methods comprising a source of hydraulic pressure; a hydraulic load; and an energy recovery circuit. The source of hydraulic pressure is fluidly connected to the hydraulic load through a first hydraulic channel with an orifice. The energy recovery circuit includes a recovery channel which is fluidly connected at its first end to the orifice on the side of it which is connected to the source of hydraulic pressure, and which is fluidly connected at its second end to a hydraulic motor.

The disclosure provides a blowout preventer system including: a hydraulic circuit, a blowout preventer including a ram having an open port and a close port, a hydraulic fluid tank, a hydraulic fluid pump, and a control valve. The hydraulic circuit includes: a first accumulator, a first valve, and a second valve. The control valve is coupled to the open port, the close port, and the hydraulic fluid tank. The first accumulator is coupled to the control valve by way of the first valve and to the close port by way of the second valve. The first valve allows hydraulic fluid to flow from the control valve to the first accumulator but prevents hydraulic fluid from flowing back to the control valve. When the control valve is in the open position, the second valve is closed, and when the control valve is in the close position, the second valve is open.

The present disclosure relates to a motion control unit that is capable of receiving electrical power from an electrical power source and hydraulic power from a hydraulic power source. The motion control is configured to produce a blended power output derived from the electrical and hydraulic power which can be used to power a hydraulic actuator. The motion control unit can also split hydraulic power recovered from hydraulic actuator to the electrical power source and the hydraulic power source.

This control device controls movement of a valve body of a valve device included in a hydraulic system and includes: a stroke command calculator that calculates a stroke command for the valve body on the basis of an opening command that is input to the stroke command calculator; an observer that estimates, on the basis of the stroke command, a dynamic deviation of a stroke of the valve body that corresponds to the stroke command; and a flow force estimator that estimates, on the basis of the stroke command and the dynamic deviation, a flow force acting on the valve body. The stroke command calculator calculates the stroke command on the basis of the flow force in addition to the opening command.

A work vehicle includes computing system is configured to receive a first and seconds inputs associated with controlling an operation of first and second hydraulic loads. Furthermore, the computing system is configured to control the operation of the first or second flow control valve corresponding to the one of the first or second hydraulic loads associated with the greater hydraulic fluid pressure based on the corresponding received first or second input. Additionally, the computing system is configured to determine the first or second pressure of the hydraulic fluid being supplied to another of the first or second hydraulic loads. Moreover, the computing system is configured to control the first or second flow control valve corresponding to the other of the first or second hydraulic loads based on the corresponding received first or second input and the determined first or second pressure.