Robust and Simplified Design of Slip Control System for Torque Converter Lock-Up Clutch

摘要

A torque converter lock-up clutch slip control system, which is designed to improve fuelneconomy, must be able to precisely regulate slip speed. Also the system must have a highnlevel of robustness for coping with changes in the operating conditions and any deterio-nration in the automatic transmission fluid and the clutch. Moreover, to reduce the designntime, the design process must be as simple as possible. In this paper, we first propose anloop shaping that aims to optimize complementary sensitivity function of the controlnsystem, while satisfying the abovementioned requirements of performance and robust-nness. Next, a method for simplifying the design process is proposed, that is, a model andna controller are expressed by interpolation. A controller set, which has a relationship ofnduality to the interpolation parameters of the model, is created in advance so that thenconstruction of a new control system can be realized by identifying the characteristicnparameters only. From application to the actual design process for a vehicle, we verifiednthat the design time was reduced to less than 1/3 of that required for the conventionalnmethod. This new method has already been adopted for the design and fitting of newnproducts.