Analysis of Differential Feedforward Servo Control Method for Four-Way Valve Controlled Asymmetric Hydraulic Cylinder
Because the effective area of the left and right cavities of the asymmetric hydraulic cylinder is different,the dynamic characteristics and control strategy of the asymmetric hydraulic cylinder are more complicated than that of the symmetrical hydraulic cylinder.The mathematical model of four-way valve controlled asymmetrical hydraulic cylinder is established as the controlled object,and a differential feedforward controller is designed and applied to the servo system.According to the input command and feedback signal,the opening of four-way valve is adjusted in real time to realize the control of asymmetrical hydraulic cylinder.The experimental results show that the hysteresis time of the valve-controlled asymmetric cylinder servo system following the response curve is 0.024 s,and the amplitude attenuation is 5%,which is within the allowable range of the control requirements of the servo system.
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