An Automatic Clutch Engagement Strategy for Electric Vehicle Based on Fuzzy Control

In order to solve the deterioration problem of synchronizer for no clutch automated mechanical transmission (AMT) technology, an automatic clutch actuator was developed for a light electric vehicle which is driven by a single traction motor. By introducing an automatic clutch engagement-schedule and thereof the fuzzy control strategy which simulate the experienced manual process of clutch, a double variables fuzzy controller (DVFC) is designed with the speed signals of clutch driving and driven discs as input parameters and the pulse width modulation (PWM) signal of the automatic clutch actuate motor as output parameter. By using MATLAB/Simulink software, off-line simulation model of AMT system is created. The simulation results show that the automatic clutch fuzzy control strategy can realize the “quick-slow-quick” engagement schedule at clutch sliding stage and it can simulate the experienced manual clutch with greatest degree. The friction work and degree of shock has been controlled effectively and thus the problem for AMT system is solved.