The control problem of electronically controlled clutch

　　The automatic clutch of the vehicle can automatically perform the separation and combination operation according to the driving conditions of the vehicle and the driver’s intention to realize semi-automatic shifting. The control performance of this clutch directly affects the longitudinal comfort and fuel economy of the vehicle. Therefore, studying the control problems of electronically controlled clutches has important industrial application value. Generally speaking, the control of the clutch has to solve two problems: one is the coupling law of the clutch; the other is the actuator tracking the coupling law. Therefore, the entire controller is divided into an upper-level controller and a lower-level controller. Shen Shuiwen and others discussed the upper-level controller to solve the problem of the coupling law of the clutch. Due to the non-linearity, time lag, external interference, parameter perturbation and other influences in the system itself, it is difficult for the lower-level controller to track the clutch engagement law. In this paper, a sliding mode variable structure controller is designed, which adopts switching function leading compensation method to reduce chatter vibration. Motor-driven clutch actuator modeling 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 The controller is used to generate control signals and input the inner loop. In the figure, x is the reference displacement of the clutch release bearing, which represents the ideal coupling law 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 after the friction plate of the driven disc is worn, and make the pedal easy to operate.

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