Artemis Intelligent Power Limited

Mitsubishi Heavy Industries Limited

Danfoss Scotland Limited

Daniil Sergeevich Dumnov

Takahiro Nakano

Niall James Caldwell

Jun Hashimoto

Tsuyoshi Wakasa

Uwe Bernhard Pascal Stein

Takeshi Miki

William Hugh Salvin Rampen

Masayuki Shimizu

Kentaro Hayashi

Stephen Michael Laird

Ken Nakayama

Michael Richard Fielding

Atsushi Maekawa

Kazuhisa Tsutsumi

Uwe Stein

Satoshi Iwasaki

Pierre Joly

Matthew Green

William Rampen

Jack Samuel Lavender

Toshihide Noguchi

Takuya Koyanagi

Robert George Fox

Hidekazu Ichinose

Hauke Karstens

Alasdair Ian Fletcher Robertson

Fumio Hamano

Daniel Abrahams

Stephen Laird

Venkata Pappala

Peter Mccurry

Stephen Salter

Robert Fox

Jill Macpherson

Yasuhiro Korematsu

Alasdair Robertson

Takeo Ohira

Shigeru Hokazono

Mathew Green

Pierre Robert Joly

Yusaku Egashira

Francesco Baldini

Jamie Taylor

Michael Fielding

A hydraulic apparatus including an electronically commutated machine having a plurality of working chambers which are controlled on each cycle of working chamber volume to carry out active or inactive cycles of working chamber volume allows only a plurality of defined fractions of cycles to be active cycles to avoid generating frequencies of active cycles which cause low frequency resonances. The demand signal may be quantised into fractions m/n where n is an integer below a threshold selected to avoid repeating patterns of active cycles of more than a cut-off length.

Electronically commutated hydraulic machine and operating method to reduce generation of resonance effects

A vehicle includes: a prime mover; a hydraulic fluid manifold; a hydraulic machine; a hydraulic accumulator; one or more hydraulic actuators; a valve arrangement; and a controller. The controller is configured to receive an actuator demand signal indicative of a demand to move the one or more hydraulic actuators; and to control the hydraulic machine and the valve arrangement to cause movement of the one or more actuators in accordance with the actuator demand signal by bringing the hydraulic accumulator into fluid communication with a first actuator chamber of the one or more hydraulic actuators, and to synchronise therewith changing a pressure in a second actuator chamber of the one or more hydraulic actuators. The second actuator chamber is in fluid communication with the hydraulic machine.

Hydraulic apparatus and method for a vehicle

A hydraulic transmission comprising a variable displacement pump and motor, at least one having cylinders having valves which are controllable on each cycle of cylinder working volume to determine the net displacement of working fluid by the cylinder. The transmission has a valve control module which determines a displacement of the pump and the motor by specifying a displacement demand. The pump and/or motor valve control module determine the frequency of intensity peaks in the frequency spectrum of the pattern of cylinders carrying out active and inactive cycles of cylinder working volume using a first procedure and, if these will fall within disallowed frequency bands including the resonant frequency of components with which the transmission is in mechanical communication, the displacement demand, or another input, is periodically modified to suppress generation of those frequencies. The hydraulic transmission is useful for example in a wind turbine generator, or a vehicle.

Hydraulic transmission

A fluid-working machine has a working chamber of cyclically varying volume, high and low pressure manifolds, and high and low pressure valves for regulating the flow of fluid between the working chamber and the high and low pressure manifolds respectively. A controller actively controls at least one said valve to determine the net displacement of working fluid of the working chamber on a cycle by cycle basis. At least one said valve is a variable timing valve and the controller causes the valve to open or close at a time determined taking into account one or more properties of the performance of the fluid working machine measured during an earlier cycle of working chamber volume.

Fluid-working machine valve timing

A fluid-working machine for a renewable energy generation device, the fluid-working machine comprising a ring cam and a plurality of working chambers, the ring cam having an annular working surface extending around an axis of rotation of the ring cam, the annular working surface defining a plurality of waves, each working chamber having a piston, each piston in operative engagement with the ring cam working surface, the ring cam and working chambers being mounted to rotate relative to each other, cycles of working chamber volume being thereby coupled to rotation of the ring cam relative to the working chambers, characterized in that the individual waves of the ring cam working surface have an asymmetric profile.

Fluid-working machine with multi-lobe ring cam

A hydraulic pump is driven by a rotating shaft, driven in turn by a renewable energy source. A hydraulic motor drives a load and a high pressure manifold communicates between the pump, motor and an elastically deformable fluid retaining body. The pressure in the high pressure manifold is measured and the net rate of displacement of working fluid by the hydraulic pump is selected responsive thereto to regulate the torque applied to the rotating shaft. The net rate of displacement of working fluid by the hydraulic motor is selected to smooth the energy flow to the load. The net rate of displacement of working fluid by the hydraulic motor is selected to regulate the pressure in the high pressure manifold to remain within an acceptable pressure range.

Method and apparatus for extracting energy from a fluctuating energy flow from a renewable energy source

A fluid working machine comprises a working chamber of cyclically varying volume, a high pressure manifold, and an actuated high pressure valve for regulating the flow of fluid between the working chamber and the high pressure manifold. The actuated high pressure valve comprises a moveable valve member, operable between a closed position and at least one open position. A controllable opening mechanism provides an active urging force to urge the moveable valve member from the said closed position towards at least one said open position, the volume of the working chamber varying between a maximum volume and a minimum volume. The controllable opening mechanism provides the active urging force more than once while the volume of the working chamber is intermediate the maximum of chamber volume and the minimum of chamber volume.

Fluid working machine and method of operating a fluid working machine

An object of the invention is to provide a wind turbine generator or a tidal current generator which is equipped with a hydraulic transmission and achieves a superior power generation efficiency, and a operation method thereof. The wind turbine generatorcomprises a hydraulic pumpof a variable displacement type which is rotated by the main shaft, a hydraulic motorof a variable displacement type which is connected to the generator, and a high pressure oil lineand a low pressure oil linewhich are arranged between the hydraulic pumpand the hydraulic motor. The pump controllerobtains a target torque of the hydraulic pumpat which a power coefficient becomes maximum, and then sets a displacement Dof the hydraulic pumpbased on the target torque and the pressure in the high pressure oil line. The motor controllersets a displacement Dof the hydraulic pumpbased on a discharge amount Qof the hydraulic pump obtained from the displacement Dof the hydraulic pumpso that the rotation seed of the generatorbecomes constant.

Wind turbine generator and tidal current generator and operation method thereof

A wind turbine generator includes a hydraulic pump rotatable by a main shaft, a hydraulic motor connected to a generator, and a high pressure oil line and a low pressure oil line which are arranged between a hydraulic pump and a hydraulic motor. An operation mode selection unit switches an operation mode between a normal operation mode and a low rotation speed operation mode depending on environment conditions. The low rotation speed operation mode has a rated rotation speed of the main shaft lower than that of the normal operation mode, at least one of a rated displacement of the hydraulic pump and a rated pressure of the high pressure oil line that are greater than that of the normal operation mode and a rated output of a generator substantially same as that of the normal operation mode.

Wind turbine generator with a control unit for controlling a rotation speed of a main shaft

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Edinburgh, United Kingdom

Daniil Sergeevich Dumnov