Abstract: In order to enhance the driving quality of wet dual-clutch vehicle, the key issues of micro-slip control (MSC) of wet dual-clutch are studied. Firstly, the effects of micro-slip on clutch damping are analyzed, and a mathematical model for the controlled object is created. On this basis, a current/micro-slip double closed-loop structure of clutch MSC system is proposed and the design methods of current controller and micro-slip controller are investigated. Then real vehicle test is conducted to verify the accuracy of current/micro-slip double closed-loop control scheme and the effectiveness of MSC in attenuating the vibration transferred from engine. Finally clutch cooling test is performed to get the desired flow rate and outlet temperature of clutch coolant, based on which the optimal amounts of clutch micro-slip under different engine speeds and transmission fluid temperatures are determined. The results of the study indicate that it is a practical and feasible approach by applying MSC to enhance the driving quality of wet dual-clutch vehicle

Key words: wet dual-clutch, micro-slip, closed-loop control, driving quality