Patent ID: 6010309
Filing Date: 2000-01-04
Classification: E02F,F04B

Abstract:
Apparatus comprising:an engine;a variable capacity pump driven by said engine;a regulator for controlling a swash plate angle of said variable capacity pump;an engine speed sensor for detecting engine speed of said engine;a control valve for regulating a control pressure to said regulator;a first controller for pre-storing a pump absorption torque curve consecutively increasing and decreasing in steps in accordance with increases and decreases in the speed of said engine, and for outputting a pump absorption torque instruction corresponding to an engine speed signal from said engine speed sensor based on said stored pump absorption torque curve when controlling said variable capacity pump; anda second controller for pre-storing a curve of control current values, going to said control valve, corresponding to the pump absorption torque, and for outputting to said control valve a control current value control instruction corresponding to a value of said pump absorption torque instruction from said first controller based on said curve of control current values.