In order to improve the shift quality and extend the durability of the clutch, the engine coordinated control for gear downshifts is studied in this paper. A dynamic model of 2-1 shifting process is built using the Lagrange method. Subsequently, by analyzing stages of the shifting process, the quantitative relationship between the input torque and the clutch friction torque of ideal gear shifting has been obtained, and the ideal control trajectories of clutch pressure are proposed. The output torque observer is designed, moreover, the coordinated powertrain control strategy for gear shifting has been provided. The experimental results show that through coordinated engine torque control, the shift jerk and the friction work during downshift inertia phase can be reduced significantly; what's more, the shift quality of power-on downshifting can be improved by the closed-loop control of turbine speed.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Engine coordinated control for automatic transmission downshift process


    Contributors:
    Li, Gang (author) / Huang, Ying (author) / Ge, Yanwu (author) / Wan, Guoqiang (author)


    Publication date :

    2013-07-01


    Size :

    351984 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Coasting downshift control device for automatic transmission

    KAWAMOTO YOSHINOBU / TAKENAKA HIROYUKI / ENDO GO | European Patent Office | 2016

    Free access

    Method of controlling automatic transmission coasting downshift

    TSENG HONGTEI ERIC / TESLAK CHRISTOPHER JOHN / RIEDLE BRADLEY DEAN et al. | European Patent Office | 2015

    Free access

    Sub-idle downshift control of transmission

    JOUSMA JASON | European Patent Office | 2016

    Free access

    Transmission coasting downshift change intention control method

    LIN YUANZONG / YIN LIANZUO / ZHU GAOHUA et al. | European Patent Office | 2022

    Free access

    Sub-idle downshift control of a transmission

    JOUSMA JASON | European Patent Office | 2017

    Free access