Abstract
A robust controller is proposed for clutch-to-clutch shift of a stepped ratio automatic transmission. The control strategy consists of three parts: the feedback controller is derived using μ synthesis, which guarantees the system robustness; the feed-forward controller is designed to improve the tracking performance; the disturbance compensator is used to reduce the effect of the disturbance on the system output. Finally the designed controller is tested on a power-train simulation model, which contains complete drive train and clutch actuators. It is demonstrated that the controller is robust against parameter uncertainties and driving condition variations. Moreover, the discrete implementations with sampling time of 10ms show the potential of the proposed controller to be used in real vehicles.
