Artemis Intelligent Power Limited

Mitsubishi Heavy Industries Limited

Daniel Abrahams

Takahiro Nakano

Niall James Caldwell

Kentaro Hayashi

Ken Nakayama

Kazuhisa Tsutsumi

Daniil Sergeevich Dumnov

Fumio Hamano

Stephen Laird

Andrew Latham

Takeo Ohira

Shigeru Hokazono

Takumi Mine

Francesco Baldini

An electronically commutated hydraulic machine is coupled to a drivetrain. Working chambers of the hydraulic machine are connected to low and high pressure manifold through electronically controlled valves. The phase of opening and closing of the valves has a default. In order to avoid cycle failure due to acceleration events, for example due to backlash in the drivetrain, the phase of opening or closing of the electronically controlled valves is temporarily advanced or retarded from the default timing.

Valve timing in electronically commutated hydraulic machine

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

Growing community of inventors

Midlothian, United Kingdom

Daniel Abrahams