RESEARCH ON COMPENSATION FOR VARIABLE DEAD-ZONE CHARACTERISTIC OF ELECTRO-HYDRAULIC PROPORTIONAL DIRECTION VALVE IN POSITION CONTROL

In this paper, a self-learning control stratagem based on digital control is put forward to compensate the variable dead-zone of electro-hydraulic proportional direction valves. Experiments show that the positioning accuracy together with the anti-disturbance ability and the steadiness of the electro-hydraulic proportional positioning system is improved considerably. Being used in real-time control system, the application of electro-hydraulic proportional system is widened in the field of high accurate positioning.