The vehicle automatic clutch can automatically perform separation and combined operation according to the driving condition of the vehicle and the driver's intention to realize semi-automatic shifting. This clutch control performance directly affects the longitudinal comfort and fuel economy of the vehicle. Therefore, studying the control problem of electronically controlled clutches has important industrial application value. In general, the control of the clutch has to solve two problems: one is the combination of the clutch; the other is the actuator tracking the combination. Therefore, the entire controller is divided into an upper controller and a lower controller. Shen Shuiwen et al discussed the problem of the upper controller to solve the clutch binding law. Due to the nonlinearity, time lag, external disturbance and parameter perturbation of the system itself, it is difficult for the lower controller to complete the tracking of the clutch binding law. In this paper, a sliding mode variable structure controller is designed, which uses the switching function lead compensation method to weaken the flutter. The motor-driven clutch actuator models a DC brushless motor position servo system, which includes two controllers, an inner loop and an outer loop. The inner loop system is a pulse width modulation power inverter controlled by a sinusoidal current; the outer loop is a variable structure. A controller for generating a control signal input to the inner ring. In the figure, x is the reference displacement of the clutch release bearing, which represents the ideal combination of the clutch, which is proposed by the upper controller, that is, the clutch controller; the DC brushless servo motor is a three-phase permanent magnet synchronous motor. It is worth mentioning that the diaphragm spring plays an important and special role in the clutch. Due to its special structure, it also functions as a separation lever and a compression spring. At the same time, its special non-linear characteristics can reliably transmit torque and make the pedals light and easy to operate after the driven disc friction plate wears.
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