Sauer Danfoss Aps

Artemis Intelligent Power Limited

Ken Kin-ho Lai

Onno Kuttler

A fluid working machine () has several working chambers () of cyclically changing volume. For pumping hydraulic fluid, the inlet and outlet valves () are electrically actuated. The timing of the actuation of said electrically actuated valves () is varied depending on the fluid flow demand.

Operating method for fluid working machine

When the fluid flow output of a synthetically commutated hydraulic pump is adapted to a given fluid flow demand, pulsations in the fluid output flow of the synthetically commutated hydraulic pump can occur. To avoid such pressure pulsations, it is suggested, to use a set of pre-calculated actuation patterns for actuating the electrically commutated valves of the synthetically commutated hydraulic pump.

Method of operating a fluid working machine

To improve the fluid output flow characteristics () of a synthetically commutated hydraulic pump (), it is suggested to use a plurality of different valve () actuation strategies. For every fluid flow demand region I to VI a certain actuation strategy is chosen.

When employing synthetically commutated hydraulic pumps (), a time delay between a change in fluid flow demand () and the resulting fluid flow output () can be observed. It is suggested to use a time evolvement function, taking into account the time evolvement of the fluid flow demand and/or the time evolvement of the pumping strokes, to modify the actuation of the electrically commutated valves.

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Edinburgh, United Kingdom

Ken Kin-ho Lai