Digital control of the hydraulic actuator

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Hydraulic actuator and electric actuator is higher than the output power of unit mass of an increasingly wide range of applications in mechanical and electrical integration. High-speed switching pneumatic accessory to control the hydraulic actuator, may a lso constitute a digital servo control system. Figure 2 for an example. Figure, the implementation of the displacement of the piston rod can change the swash plate angle to change the output flow of the pump or the motor speed, motor speed and the actuator piston rod displacement feedback to the computer through the sensor and A / D conversion, the computer will be the value of these feedback Comparison of amplification, respectively, to control two high-speed switching valve, according to the PWM control, these two valves control the flow of the actuator chamber to control the displacement of the piston rod, and ultimately control the motor speed to the target. Of course, if the actuator shown in Figure 2 to control a jelpc , can also control the working cylinder piston protrusion.