Abstract: Starting and shifting states of clutch in automatic transmission are identified on the basis of the motion states of driven plates of the clutch. Unified dynamic model is set up for the starting control of clutches in both automatic mechanical transmission (AMT) and dual clutch transmission (DCT). The linear quadratic optimal control method is used to achieve the optimum starting control of the clutches, in which the jerk is converted to one of the restrain conditions, and the minimization of sliding friction work of the clutches is set as optimal target in control. Universal optimal starting control of AMT and DCT clutches is realized through selection of state variables, setting of parameters and modifying of restrain conditions in the unified model for clutch starting of AMT, single and dual clutch starting of DCT. Simulation is carried out and then verified by experiment. The research results lay the foundation for the construction of universal development platform of the AMT and DCT automatic transmissions.

Key words: Automatic mechanical transmission, Dual clutch automatic transmission, Optimal starting control, Universal control method