Abstract
Due to the constraints from weight, volume and other various factors, mobile robot hydraulic drive system uses single pump and multi-actuator hydraulic drive structure. The high efficiency of the structure is the key to the successful application in hydraulic robot. The traditional servo valve control system possesses good position control ability, but it has the problem of bilateral throttling loss and great valve port pressure decrease. This paper proposes a hydraulic position control system based on high-frequency switching valve, which controls valve port opening and closing, through the PWM signals, so as to control flows, guarantee the position control precision as well as reduce the required system pressure, thereby achieving the effect of energy conservation. By using AMESim and Adams co-simulation and simulating the real stress environment, the feasibility of energy-saving in high frequency switching valve circuit has been verified.
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