Real-Time Estimation of Transmitted Torque on Each Clutch for Ground Vehicles With Dual Clutch Transmission

This paper mainly focuses on the robust separate estimation of transmitted torque on each clutch of the dual clutch transmission-the task that has not yet been accomplished by previously published efforts. In order to estimate the torque on individual clutches, the observer system is composed of a shaft model-based observer, unknown input observers, and a model reference PI observer. The estimations obtained by each subcomponents are processed together to provide online torque estimation of high accuracy. The proposed estimator requires the following information: speed measurements of engine, input shafts, and wheels, and nominal engine torque information obtained as a function of driver inputs and engine speed. These are already available in the current production cars; hence, no further modification or addition to the vehicle hardware is necessary. To validate the effectiveness of the proposed estimator, experiments using an actual vehicle are conducted with various scenarios. With detailed analysis of the results obtained by the experiments, the proposed dual clutch transmission torque estimator is shown to be apt for real car application.