Abstract: The smoothness of acceleration and deceleration process is a serious problem in valve control system with high inertia loads. The meter-in and meter-out independent regulating valve control unit is applied. Based on this unit, a grading control algorithm in dynamic process of high inertia loads is put forward. After the velocity approaches its command, a state feedback control algorithm based on parameters on line esti-mating is employed to guarantee both its velocity accuracy and the smoothness of dynamic process. Experiments show that the actuator’s velocity could increase or decrease to its command accurately, smoothly and rapidly after the above unit and algo-rithms are applied.

Key words: Acceleration and deceleration performance Meter-in and meter-out independent regulating Grading control, High inertia loads