Patent ID: 6609369
Filing Date: 2003-08-26
Classification: E02F,F15B

Abstract:
A pressure compensator for use in a control system for an electro hydraulic-implemented work element being operated through the use of operator input control mechanisms generating operator input signals upon the application thereof, the work element including an actuator device coupled thereto for controlling the operation thereof, the control system comprising:a sensing device in communication with the actuator device and adapted to determine an actual velocity of the actuator device, the sensing device outputting an actual velocity signal indicative of the actual velocity determined by the sensing device; a valve in communication with the actuator device and defining an opening therein for allowing a hydraulic fluid to flow therethrough; a comparator in communication with the sensing device and an operator input control mechanism configured to generate an operator input signal indicative of a desired velocity of the actuator device, the comparator being adapted to receive the actual velocity signal and the operator input signal and to produce a comparator output signal having a comparator output value representing the difference between the desired velocity and the actual velocity of the actuator device; a pressure compensator adapted to receive the operator input signal and the actual velocity signal, and to generate a pressure compensator coefficient representing a ratio therebetween, the ratio being indicative of a change in pressure across the valve; and modification device in communication with the comparator, the pressure compensator and the valve for modifying the comparator output signal by the pressure compensator coefficient to generate an input flow control signal for input to the valve, the input flow control signal being adapted to control the variable opening of the valve in order to compensate for the pressure change across the valve determined by the pressure compensator so that the desired velocity of the actuator devices is achieved.