F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
F15B 13/16 (2006.01) F04B 49/08 (2006.01) G01L 5/00 (2006.01) F15B 21/08 (2006.01)
Patent
CA 2602164
The method comprises measuring hydraulic fluid pressure in a hydraulic fluid supply conduit between a hydraulic pump and a hydraulic drive unit, switching hydraulic fluid flow direction to the hydraulic drive unit or stopping hydraulic fluid flow to the hydraulic drive unit when measured hydraulic fluid pressure crosses a predetermined pressure threshold value, and adjusting the predetermined pressure threshold value to a corrected pressure threshold value as a function of at least one of: (i) measured resistance transmitted to the hydraulic drive unit from machinery coupled to the hydraulic drive unit; and, (ii) hydraulic pump speed. The apparatus for practicing the method further includes a pressure sensor associated with a hydraulic fluid supply conduit between the pump and the drive unit, and an electronic controller programmed to operate the drive system according to the method.
Gowling Lafleur Henderson Llp
Westport Power Inc.
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