A method is provided for use in a vehicle. The vehicle includes a transmission, a turbocharger, a transmission control module (TCM), an engine, and an engine control module (ECM). The engine includes a crankshaft that rotates at an engine speed and the turbocharger includes a turbine that rotates at a turbine speed. The method includes requesting a downshift of the transmission from an off-going gear ratio to an on-coming gear ratio. The turbine is rotating at an off-going turbine speed at the off-going gear ratio and the turbine is configured to rotate at an on-coming turbine speed at the on-coming gear ratio, greater than the off-going gear speed. A determination is made that the requested downshift is a powerdown low-throttle shift. An engine speed request value is then transmitted from the TCM to the ECM. The transmitted engine speed request value is at least equal to the on-coming gear speed.


    Access

    Download


    Export, share and cite



    Title :

    Sub-idle downshift control of a transmission


    Contributors:

    Publication date :

    2017-09-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F16H Getriebe , GEARING



    Sub-idle downshift control of transmission

    JOUSMA JASON | European Patent Office | 2016

    Free access

    SUB-IDLE DOWNSHIFT CONTROL OF A 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

    Coasting downshift control device for automatic transmission

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

    Free access

    Engine coordinated control for automatic transmission downshift process

    Li, Gang / Huang, Ying / Ge, Yanwu et al. | IEEE | 2013