Abstract
This study deals with hydrostatic transmission (HST) which consists of a variable displacement axial piston pump connected in a closed circuit to a load cylinder. The cylinder adopted in this HST-system is an actuator instead of a hydraulic motor in conventional HST-systems in order to realize a translational motion control. For the variation of the swashplate angle of the pump, a hydraulic rotary actuator is used. This actuator is driven by two on-off solenoid valves based on the differential PWM method, for the purpose of making it easier for the HST-system to introduce a digital control algorithm. The system is designed by using an optimal control scheme. It is verified by experiment and digital simulation that the system has good control performance.
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