Abstract
This study deals with a hydrostatic transmission (HST) consisting of a variable displacement axial piston pump connected in a closed circuit to a fixed displacement axial piston motor. For the variation of the swashplate angle of the pump, a hydraulic rotary actuator is adopted. This actuator is driven by two on-off solenoid valves based on the differential PWM method, which thus makes the HST system easier to accomodate a digital control algorithm. In order to control the two variables of angular displacement and angular velocity of the motor, two control systems are designed using the method of the optimal control scheme. It is verified by experiment and digital simulation that the two systems have good control performance.
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