Patent ID: 8235676
Filing Date: 2012-08-07
Classification: F03C,F04C,Y10T

Abstract:
1. A method for controlling the net-displacement of a rotary fluid pressure device, the method comprising: providing a rotary fluid pressure device having: obtaining a desired input parameter at a present sample time; determining a relative position of a first member and a second member of a fluid energy translating displacement assembly; determining a first output value for each of said volume chambers, with said first output value being based on said relative position and each volume chamber being supplied with fluid having fluid conditions similar to fluid conditions at said fluid inlet of said rotary fluid pressure device; determining a second output value for each of said plurality of volume chambers, with said second output value being based on said relative position and each of said plurality of volume chamber being supplied with fluid having fluid conditions similar to fluid conditions at said fluid outlet of said rotary fluid pressure device; calculating a total output value for each of a plurality of control valve configurations; comparing said total output value to said desired input parameter; selecting one of said control valve configurations where said total output value of said control valve configuration is similar to said desired input parameter; and actuating said control valves in accordance with said selected control valve configuration.