A clutch is a mechanical device which provides engine torque to the drive shaft of a vehicle. A dry clutch control for AMT (Automated Manual Transmission) systems has been an important issue to improve fuel economy and drivability in hybrid electric systems. In this paper, we propose a dry clutch control system to apply to the parallel hybrid electric bus. In order to analysis dynamic performance of the target vehicle, a vehicle dynamic model including engine, clutch, motor, transmission and vehicle is designed. For gear shifting simulation, the shifting maps for the hybrid electric bus are applied from the analysis results of DP (Dynamic Programming) theory that is one of the optimal control methods. The shifting maps consist of a pure electric mode and a hybrid electric mode calculated by using driving cycles for commercial vehicles. From vehicle dynamic equations, the control algorithm for a dry clutch is organized by using feedback loops based on the value of an engine, a clutch speed, a clutch release travel and an estimated clutch torque. Simulations are performed to analyze the dynamic performance of the proposed clutch control system during gear shifting. As a result, the vehicle model with the designed clutch controller compares to one with only the lockup controller in energy dissipation during gear shifting. In this paper, a dry clutch control of AMT systems was presented to apply to the hybrid electric bus. The clutch control system using the engine throttle and the estimated clutch torque was proposed. This control algorithm was designed by the feedback loop based on the motion of the driveline. It was tested in vehicle simulation by using Matlab simulink and simdriveline. Simulation results show the effectiveness of the proposed clutch control system during gear shifting. Performance was evaluated in terms of duration of gearshift, dissipated energy. The clutch controlled model reduced the dissipated energy in the amount of 4.5% compared with the uncontrolled model. To obtain exact gain and the estimated clutch torque, it is suggested to investigate the various effectiveness of the proposed control in further research.


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    Title :

    A dry clutch control algorithm for AMT systems in a parallel hybrid electric bus


    Contributors:
    Shin, Changwoo (author) / Kim, Moseong (author) / Zheng, Chunhua (author) / Lim, Wonsik (author) / Cha, Sukwon (author)

    Published in:

    Publication date :

    2012


    Size :

    6 Seiten, 7 Bilder, 2 Tabellen, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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