BOB·半岛

The automatic clutch of a vehicle can automatically disengage and engage according to the driving conditions and the driver's intention, achieving semi-automatic gear shifting. The performance of this clutch control directly affects the longitudinal comfort and fuel economy of the vehicle. Therefore, studying the control problem of electronic clutch has important industrial application value. Generally speaking, clutch control needs to solve two problems: first, the engagement law of the clutch; The second is for the actuator to track the binding pattern. Therefore, the entire controller is divided into upper level controller and lower level controller. Shen Huishui and others discussed how the upper level controller solves the problem of clutch engagement law. Due to the presence of nonlinearity, time delay, external disturbances, parameter perturbations, and other factors in the system itself, it is difficult for the lower level controller to track the clutch engagement law. This article proposes a sliding mode variable structure controller that uses the switching function lead compensation method to reduce flutter. Modeling of DC brushless motor position servo system for motor driven clutch actuator, which includes two controllers: inner loop and outer loop. The inner loop system is a pulse width modulation power inverter controlled by sine current; The outer loop is a variable structure controller used to generate control signals for input into the inner loop. In the figure, x represents the reference displacement of the clutch release bearing, which represents the ideal engagement law of the clutch and is proposed by the upper level controller, namely the clutch controller; The DC brushless servo motor is a three-phase permanent magnet synchronous motor. It is worth mentioning that diaphragm springs play an important and special role in clutches. Due to its unique structure, it serves as both a separation lever and a compression spring. At the same time, its special nonlinear characteristics can reliably transmit torque even after the wear of the driven disc friction plate, and make pedal operation lightweight.