Design and test of electronic controlled flexible clutch system for public transportation vehicles

To solve the problem of joint speed and strength of electricity controlled flexible clutch system (DMT) in the buses, the paper proposed a control method of pulse width modulation (PWM) based on the Freescale of 16-bit MC9S12XEP100 microcontroller. Designed the DMT control circuit and used the PID control of exciting current. The test results show that PWM control solved the rapid joint lead to overshoot, the slower joint when the buses started and slipping issues in the process of driving. It achieved the reliable and accurate control of DMA.