Modelling and simulation of AMT shift actuator

In automatic mechanical transmission (AMT), shift actuator is the key special component to realize automatic transmission. Its performance determines the realization of AMT basic functions and then affects the shift quality of the whole vehicle. In this paper, a shift actuator is designed for the two-speed AMT with a type of electric drive axle. Its compositions and control methods are introduced. Under the load and interference conditions, the shift time and the angular displacement fluctuation of the shift motor of PID control, ordinary sliding mode control and global sliding mode control are compared. The global sliding mode control has more advantages. The results show that: 1. The shift time (time from start of shift to end of shift) of the AMT reach 300ms. 2. The maximum value of fluctuation of motor angular displacement of the shift actuator is 0.4923rad. The study shows that the control method of the shift actuator has strong anti-interference ability and improves the shift quality of AMT system.