Abstract

This paper describes the development of a robust feedback controller for the torque converter clutch slip control system mounted in the Toyota A541E automatic trans-axle. H∞ control theory was applied as a systematic design method in order to ensure robust stability against large variation in characteristics under vehicle operating conditions and variation in friction characteristics of the clutch induced by aging deterioration. As a result, the control system achieves high levels of response and reliability, which contribute to a large-scale reduction of fuel consumption.

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