Patent ID: 9091254
Filing Date: 2015-07-28
Classification: B60K,F04B,Y02T

Abstract:
1. A method of operating a fluid working machine, the fluid working machine comprising 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 comprising a moveable valve member, operable between a closed position in which the actuated high pressure valve seals the working chamber from the high pressure manifold and at least one open position in which the working chamber is in fluid communication with the high pressure manifold through the actuated high pressure valve, and a controllable opening mechanism operable to provide an active urging force to urge the moveable valve member from 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 method comprising: actively urging the movable valve member from said closed position towards at least one said open position by the controllable opening mechanism that 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 during a cycle of working chamber volume.