A hydraulic circuit device for a vehicle, includes a clutch, a flow path, a fluid pump, a pressure generating device, and a control valve. The control valve is configured to determine whether a transmission start-stop function activation condition other than a vehicle speed is satisfied, determine whether a system start-stop function activation condition related to a component of the vehicle is satisfied, the component being other than the transmission, determine whether the vehicle speed is equal to or lower than a first speed threshold, and boost a line pressure of the flow path to accumulate pressure in the pressure generating device for preparing activation of the start-stop function if it is determined that the transmission start-stop function activation condition and the system start-stop function activation condition are satisfied, and if it is determined that the vehicle speed is equal to or lower than the first speed threshold.

The present invention provides a hoisting system which includes at least one hydraulic hoisting cylinder, a pressurized gas reservoir, and an emergency lifting line with a first valve. The emergency lifting line selectively leads a pressurized gas from the pressurized gas reservoir into the at least one hydraulic hoisting cylinder.

A system and method for providing redundancy in hydraulic circuits in multi-cycle hydraulic tools is described. The problems of dysfunctional hydraulic tool due to the failure of electromechanical actuators are addressed by providing redundant actuators and associated circuitry design.

A liftgate assembly, such as a for a delivery vehicle, includes a liftgate that is movable by hydraulic power between a raised position and a lowered position. The hydraulic power unit includes an energy-recovery mechanism that stores energy while the liftgate is being lowered under load. Energy stored by the energy-recovery mechanism, such as in an accumulator, may be used to raise the liftgate. The hydraulic power unit includes a pump that pumps hydraulic fluid for providing hydraulic pressure. The liftgate assembly thereby uses energy more efficiently, enabling repurposing part of the energy from lowering the liftgate (and any cargo thereupon) in raising the liftgate.

This disclosure includes systems and methods for actuating hydraulically-actuated devices.

A hydraulic system for an aircraft. The hydraulic system can include a hydraulic actuator that is operatively coupled to a flight control member. Hydraulic fluid is moved through the hydraulic system by an engine driven pump that delivers hydraulic fluid to the actuator at a first pressure, and a boost pump that delivers hydraulic fluid to the actuator at a second pressure that is higher than the first pressure. The hydraulic system is configured such that the hydraulic fluid returning from the actuator to the engine driven pump can be delivered to the boost pump prior to reaching the engine driven pump.

The hydraulic system can include a control member that is operatively coupled to a member. The control member can include a hydraulic control member and an integrated inerter. Hydraulic fluid at variable pressures is moved through the hydraulic system by pumps. The hydraulic system can be configured for hydraulic fluid returning from the control member to the first pump to be delivered to the second pump prior to reaching the first pump. A dual-spool valve is positioned between the pumps and the control member to control the flow of the hydraulic fluid. The dual-spool valve is movable to move the hydraulic fluid at variable pressures into and out of first and second chambers of the control member. The dual spool valve can also be configured to operate the control member when a spool is not operational.

An electro-hydraulic valve actuator having a modular manifold assembly with a network of channels that fluidly connect a hydraulic cylinder assembly to a hydraulic power assembly. The hydraulic cylinder assembly includes a piston rod that can directly or indirectly open or close a process valve. The hydraulic power assembly has a main pump and motor, and the manifold assembly includes a main manifold block to which is mounted the hydraulic cylinder assembly and the main pump and motor. The main manifold block has pluggable channel ports that can be unplugged to provide fluid communication with corresponding channel ports of at least one auxiliary manifold block that can be mounted to and integrated with the main manifold block. The at least one auxiliary manifold block has either a second pump and motor or a manual override pump.

A system for storing energy includes an energy storage apparatus having one or more energy storage storing water and compressed gas; and a water pump for supplying water from an environmental water source to the energy storage. The water source includes oceans, rivers, streams, lakes, reservoirs, spring water, groundwater, and reused water.

A compressed-air energy storage system of a constant-pressure full-capacity energy-release type, includes two or more liquid-gas coexisting containers, at least one of the two or more liquid-gas coexisting containers is filled with a pressurized liquid, the rest liquid-gas coexisting containers are configured to store a high-pressure air, and the two or more liquid-gas coexisting containers are in communication with each other. When the compressed-air energy storage system of the constant-pressure full-capacity energy-release type operates in an energy storage operating condition, the high-pressure air can be directly stored in the liquid-gas coexisting container without energy conversion loss. When the compressed-air energy storage system operates in an energy release operating condition, the pressurized liquid circulates in the liquid-gas coexisting containers storing the high-pressure air, to realize a constant-pressure full-capacity release of the high-pressure air.