Control of hydraulic actuators by controlling electro-hydraulic servovalves

According to the three principles of analysis and energy supply, the following important conclusions can be obtained: There can only be one operation in the forward channel of the control system, that is, only the integral operation can be used, and in order to ensure the stability of the control system and the ideal control characteristics, variables must be provided. The differentiation, due to avoiding the differentiation of the input parameters, the differential of the controlled variables required for compensation purposes must all be located in the feedback loop. Based on these three points, it only uses the integral transfer in the feedforward loop, and the output is amplified and fed back to the output of the integrator. Although there is no direct differentiation of the controlled variable, it is actually equivalent to the controlled variable. The differential feedback is fed to the input, and the result is exactly the same as the differential, and the coefficients on the right side of the expression are independent of each other, satisfying the expression that each coefficient in the characteristic equation of the control system cannot have the product or the sum of the control coefficients. Adjustability requirements.

In the past few years, we have been working on the application of pseudo-differential feedback control to electro-hydraulic servo control, which has achieved very good results. Controlling high precision, low-speed dead angle, small response, fast anti-interference ability, strong robustness, easy control, and real-time control. The first phase of the first phase of the year is insensitive to the nonlinearity of the hydraulic control system and the cooperation between the circuits, and can simultaneously control the positional velocity and acceleration. Therefore, the servo system requirements of the cam grinder can be fully met. Electro-hydraulic servo system design control system structure The transmission mechanism of the cam numerical control grinder is divided into the rotary motion of the grinding head and the feed motion of the moving wheel frame. The expression of the control signal is the wave pressure meter, and the de-energizing actuator performs the calculation and control of the cylinder oil motor. The control is to receive the command of the host computer by the single-chip microcomputer. The hydraulic actuator is controlled by the electro-hydraulic servo valve to realize the two movements of the cam grinder, that is, the indexing angle and the lift, and the grinding is completed on the cam. (Finish)