Patent ID: 6360536
Filing Date: 2002-03-26
Classification: F15B

Abstract:
A control system for a hydraulic transformer for providing hydraulic pressure to a fluid actuator comprising a hydraulic system for providing hydraulic pressure to the hydraulic transformer, a controller connected to the hydraulic transformer, the controller for determining the input pressure provided to the hydraulic transformer and for controlling the operation of the hydraulic transformer based upon input pressure provided to the hydraulic transformer, the controller including at least one of a proportional control term unit, an integral control term unit and a derivative control term unit, the proportional control term unit being capable of determining a first power signal error between a reference power signal and the actual power signal being supplied to the input of the hydraulic transformer and of controlling a displacement ratio of the hydraulic transformer in a manner proportional to the first power signal error, the integral control term unit being capable of determining a second power signal error between a reference power signal and the actual power signal being supplied to the input of the hydraulic transformer and of ensuring a substantially zero steady state error in the actual power being supplied relative to the reference power signal, the derivative control term unit being capable of determining whether there are any oscillations at the input of the hydraulic transformer and of thereby actively substantially canceling any resultant oscillations within the hydraulic transformer.