Design of estimators for the output shaft torque of automated manual transmission systems

This study mainly focuses on the accurate estimation of the output shaft torque - and thus the clutch torque - of the automated manual transmissions as well as dual clutch transmissions, using the data available in the current production vehicles. The required information includes the nominal engine torque map and measurements of engine speed, clutch speed, and wheel speed. Utilizing the above-mentioned information, based on the design of four types of observers (unknown input observer, shaft compliance observer, synthesis of these two types of observers, and an adaptive observer), several methods to obtain the torque estimation without additional cost are developed to improve the feedback control performance of the clutch actuators and thus the vehicle launching and gear shift qualities. The stability of the proposed observers is investigated, and a set of assessments to confirm the performance of the observer system is arranged via simulation.