Estimation of turbine torque using an adaptive nonlinear observer for closed-loop control of vehicle automatic transmissions

This paper presents an adaptive sliding observer-based method for the estim ation of turbine torque. The estimations of turbine torque can be used in t he closed-loop control of vehicle power train for better shift quality. A s liding observer structure including saturation functions and boundary layer s is applied to adapt torque converter parameters. The proposed method has been investigated via simulation and laboratory experimental studies. It ha s been shown via simulation and experiments that the proposed methodology i s promising for the estimations of turbine torque since it uses only inexpe nsive angular velocity measurements and is ndt sensitive to parametric unce rtainties.