Clutch Reliability Compensation Control Based on Friction Coefficient and Its Rate of Change

A reliability compensation control scheme was proposed based on the change rate of friction coefficient to solve the problem of possible clutch control failure caused by an excessive change rate of friction coefficient. By using SAE#2 test platform, the friction coefficient test was completed, and the variation of friction coefficient with working parameters was obtained under different input speed, oil temperature and oil pressure. A failure evaluation model was established based on the change rate of friction coefficient and the compensation fuzzy control scheme was designed. The bench test results show that the improved control algorithm can effectively extend the clutch engagement time and improve the working reliability of the clutch friction pair under the high temperature overload condition with high friction coefficient.