Abstract: A digital pressure compensation method in electrohydraulic proportional throttle velocity control system is proposed to increase its anti-disturbance ability. Results show that the system's velocity stiffness was raised considerably. As its algorithm is very simple, easy to be realized, and has a good real-time characteristic, it is one of the best way to increase the anti-disturbance characteristic in electrohydraulic proportional velocity control.

Key words: Anti-disturbance, Digital pressure compensation, Electrohydraulic proportional velocity control, Piston skirt lubrication, Secondary motion, The middle-convex and varying ellipse piston, Thermal deformation