Estimation of turbine torque of automatic transmissions using nonlinear observers

This paper presents an adaptive sliding observer-based method for estimatio n of turbine torque. The estimated turbine torques can be used for the clos ed-loop control of vehicle power train for better shift quality. A sliding observer structure including saturation functions and boundary layers is ap plied to adapt torque converter parameters. The proposed method has been in vestigated via simulation and laboratory experimental studies. It has been shown via simulation and experiments that the proposed methodology is promi sing for the estimation of turbine torques since it uses only inexpensive a ngular velocity measurements and is not sensitive to parametric uncertainti es. [S0022-0434(00)00302-6].