FLUID-WORKING MACHINE VALVE TIMING

摘要

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.

主权项

1. A method of controlling a fluid working machine, the fluid working machine comprising a working chamber of cyclically varying volume, a low pressure manifold and a high pressure manifold, a low pressure valve for regulating communication between the low pressure manifold and the working chamber, a high pressure valve for regulating communication between the high pressure manifold and the working chamber, and a controller which actively controls one or more said valves to determine the net displacement of fluid by the working chamber on a cycle by cycle basis, at least one of the low pressure valve and the high pressure valve being a variably timed valve, the timing of the opening or closing of which is variable relative to cycles of working chamber volume, characterised by the method comprising measuring one or more properties of the performance of the fluid working machine during an earlier cycle of working chamber volume and controlling the timing of the opening or closing of a said variably timed valve during a later cycle of working chamber volume taking into account the one or more properties measured during the earlier cycle.