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8984872 Hydraulic accumulator fluid charge estimation system and method  
A method for estimating a fluid charge of a hydraulic accumulator includes determining a first accumulator pressure at a first time with a pressure sensor, the first time during accumulator...
8959906 Gas boosters  
One or more examples of the gas boosters described herein aim to provide a light weight gas booster configured to produce high output pressure levels at high volumes. Generally described, one or...
8938956 Method of operating an energy recovery cylinder  
The present invention relates to an implement, in particular an excavator or machine for material handling, with an element movable via at least one working drive, wherein at least one energy...
8931267 Pumps  
A pump for use in pumping hydraulic well control fluid expelled from a control device of a well, comprises means for accumulating such hydraulic well control fluid and means for using the pressure...
8915074 System and method for determining accumulator fill  
A method for determining whether an accumulator is filled to a predetermined level with a hydraulic fluid includes commanding a current to a solenoid, providing pressurized hydraulic fluid to the...
8887498 Transmission hydraulic control system having an accumulator bypass valve assembly  
A system for providing pressurized hydraulic fluid includes a pump. A bypass valve assembly includes an inlet port in communication with the pump and an outlet port in communication with an...
8863508 Hydraulic circuit having energy storage and reuse  
A hydraulic circuit is disclosed. The hydraulic circuit may have a pump, a motor, a tank, and an accumulator. The hydraulic circuit may also have a valve movable between a first position at which...
8844278 System and method for controlling an electro-hydraulic charging system  
The disclosure describes, in one aspect, a control system for charging an electro-hydraulic charging system. The control system including at least one sensor operatively coupled to an engine for...
8839617 System and method for controlling charging of an accumulator in an electro-hydraulic system  
A novel energy saving mode of charging an accumulator in an electro-hydraulic system is disclosed involving toggling the position of a fan isolation valve from the flow-passing position, where the...
8776511 Energy recovery system having accumulator and variable relief  
A swing energy recovery system for a machine is disclosed. The swing energy recovery system may have a pump configured to pressurize fluid, a motor driven by a flow of pressurized fluid from the...
8677742 Accumulator with solenoid valve  
An accumulator includes a canister, a piston, a sleeve, and a solenoid control valve assembly. The canister has an inner surface that defines an interior volume. The piston is slidably disposed...
8621858 Hydraulic circuit for a regenerative drive assembly  
An assembly (10) forming part of a regenerative drive system for a motor lorry. The motor lorry has a driven train that is operatively associated with the assembly (10) so as to cause operation of...
8590296 Systems and methods for reducing dead volume in compressed-gas energy storage systems  
In various embodiments, dead space and associated coupling losses are reduced in energy storage and recovery systems employing compressed air.
8561397 Leakage detection system in a wind turbine  
In one aspect, a hydraulic system including a reservoir, a hydraulic device, a first sensor, a second sensor and a controller is described. The reservoir is connected to the hydraulic device for...
8479502 Increased power in compressed-gas energy storage and recovery  
In various embodiments, energy is stored or recovered via super-atmospheric compression and/or expansion of gas in conjunction with substantially adiabatic compression and/or expansion from or to...
8413436 Open accumulator for compact liquid power energy storage  
An accumulator system is configured to store energy and includes an accumulator having a liquid chamber coupled to a liquid port and an air chamber coupled to an air port. The liquid chamber and...
8286426 Digital hydraulic system  
A control system for a work machine having a hydraulic energy source, a hydraulic accumulator, a digital hydraulic system having a digital hydraulic transformer, a hydraulic actuator and a movable...
8256215 Fuel efficient hydraulic power steering  
A hydraulic power steering system that maintains proportional pressure control between an input side of a gear and assist pressures internal to the steering gear by relying upon a control valve. A...
8250861 Energy storage system including pressurized reservoir  
An energy storage system includes a reservoir defining an interior chamber, a collapsible bladder positioned within the interior chamber and having working fluid therein, a one-way valve in fluid...
8240143 Hydraulic energy recovery system  
A circuit having at least one hydraulic motor, two main ducts for feeding or discharging the at least one motor, a low-pressure fluid source, and a high-pressure accumulator forming a...
8224495 Control of power generation system having thermal energy and thermodynamic engine components  
A thermal source provides heat to a heat engine and or one or more thermal demands, including space and water heating and heat storage. Additionally the output of the heat engine may be used for...
8209975 Arrangement for operating a hydraulic device  
A fluid system includes a controllable first pump unit for supplying fluid pressure to at least one implement; a prime mover arranged to supply a driving torque to the first pump The first pump...
8191362 Systems and methods for reducing dead volume in compressed-gas energy storage systems  
In various embodiments, dead space and associated coupling losses are reduced in energy storage and recovery systems employing compressed air via use of a compressed-gas reservoir for maintaining...
8181457 Fuel efficient hydraulic power steering  
A hydraulic power steering system that maintains proportional pressure control between an input side of a gear and assist pressures internal to the steering gear by relying upon a control valve. A...
8166753 Accumulator system and method of monitoring same  
An accumulator system includes an accumulator containing working fluid and gas, an isolation valve through which working fluid selectively flows to and from the accumulator, an actuator operably...
8151564 Fuel efficient hydraulic power steering  
A hydraulic power steering system that maintains proportional pressure control between an input side of a gear and assist pressures internal to the steering gear by relying upon a control valve. A...
8104274 Increased power in compressed-gas energy storage and recovery  
In various embodiments, energy is stored or recovered via super-atmospheric compression and/or expansion of gas in conjunction with substantially adiabatic compression and/or expansion from or to...
8020379 Double redundancy electro hydrostatic actuator system  
A double redundancy electro hydrostatic actuator system includes two hydraulic pumps; two fail safe valves connected with the two hydraulic pumps, respectively; one dual tandem hydraulic cylinder...
7905088 Energy recovery and reuse techniques for a hydraulic system  
A hydraulic system has a valve assembly with two workports coupled to chambers of first and second cylinders which are connected mechanically in parallel to a machine component. A separation...
7823379 Energy recovery and reuse methods for a hydraulic system  
A method provides several modes for recovering hydraulic energy produced by an overrunning load acting on cylinders connected in parallel to a machine component. In one mode, fluid from first...
7784277 Hydraulic drive system with temperature compensation for pressure limit  
A hydraulic drive system for storing and releasing hydraulic fluid includes a high pressure storage device, a low pressure storage device, and a pump-motor operating at a range of pump-motor...
7743610 Fuel efficient hydraulic power steering  
A hydraulic power steering system that maintains proportional pressure control between an input side of a gear and assist pressures internal to the steering gear by relying upon a control valve. A...
7677037 Hydraulic drive system with precharge logic  
A hydraulic drive system for storing and releasing hydraulic fluid includes a high pressure storage device, a low pressure storage device and a pump-motor operating at a range of pump-motor speeds...
7673451 Hydraulic drive system with neutral drift compensation  
A hydraulic drive system for storing and releasing hydraulic fluid includes a high pressure storage device, a low pressure storage device, and a pump-motor operating at a range of pump-motor...
7296407 Hydraulic service module  
A hydraulic service module is provided for a hydraulic fluid system, which includes a fluid reservoir for storing an appropriate amount of a hydraulic fluid. The hydraulic service module comprises...
7194856 Hydraulic system having IMV ride control configuration  
A hydraulic control system for a work machine is disclosed. The hydraulic control system has a source of pressurized fluid and at least one actuator having a first and a second chamber. The...
7159506 State detecting device for load element receiving load of working fluid and state detecting device for fluid pressure control circuit  
The load element state detecting portion 72 detects the completion of the filling of the hydraulic oil into the clutch 62 and the working limit of the accumulator 64 on the basis of the...
7100371 Hydraulic arrangement and process for its use  
A hydraulic arrangement is provided with at least one pressure accumulator for a hydraulic fluid, a hydraulic cylinder with at least one chamber to which pressure can be applied, a connecting...
7017342 Air compressor and control method therefor  
An air compressor includes a tank unit storing a compressed air used by a pneumatic tool, a compressed air generator which generates the compressed air and supplies the compressed air to the tank...
6983592 Mobile working machine  
The present invention relates to a mobile handling arrangement with hydraulic circuit, forming part of which hydraulic part of which hydraulic circuit (L) is a lifting cylinder (1) arranged in a...
6735942 Method, computer program, and control unit for operating a vacuum reservoir provided in an internal combustion engine  
Described are a method, a computer program, and a control unit for operating a vacuum reservoir provided in an internal combustion engine of a motor vehicle for a servo booster or power-assist...
6679281 Switching device for a machine  
A switching device for a machine, especially a digger, has at least one supply connection and one useful connection in addition to at least one hydraulic accumulator. An on-off valve is arranged...
6496767 Constant groundspeed autoshift method and apparatus for maximizing fuel economy  
A method of determining shift points in a step gear transmission system to maximize fuel economy is disclosed. In operation, the method uses fuel economy data from a first gear ratio to determine...
6470677 Free piston engine system with direct drive hydraulic output  
A free piston engine system, particularly suitable for use in a motorized vehicle, is provided with at least one hydraulic pump, each pump having a first fluid port and a second fluid port. A free...
6164068 Variable pressure hydraulic systems  
A variable pressure hydraulic system includes a hydraulic pressure source which is selectively connected to a hydraulic system or to drain, via a control valve and a pressure transducer; the...
6085520 Slide driving device for presses  
A slide driving device employs a variable-displacement pump/motor for driving a rotating element of the slide driving device. The displacement volume of the variable-displacement pump/motor, whose...
6070408 Hydraulic apparatus with improved accumulator for reduced pressure pulsation and method of operating the same  
Hydraulic apparatus including hydraulic supply means and an accumulator with an accumulator piston and a means for sensing the accumulator piston position to indicate a load requirement to a...
6000219 Charging valve arrangement to charge a store  
A load valve apparatus having a control valve which can be connected to a pump and an accumulator and which in a first position connects the pump to the accumulator and in a second position...
5921342 Power assisted steering apparatus for automotive vehicle  
A power assisted steering apparatus for a vehicle having a driving source, such as an engine, has an actuator, a hydraulic pump, a working oil pressure passage, and a drive switch. The actuator,...
5878569 Energy conversion system  
The energy conversion system of the subject invention converts the energy from a source of pressurized fluid, such as a free-piston engine and a storage accumulator, to a work system at various...

Matches 1 - 50 out of 196 1 2 3 4 >