A method of selecting a launch speed gear ratio in an automatic transmission 22 having a plurality of selectable speed ratios. The method comprises providing a vehicle with slope and/or obstacle sensing devices, such as cameras 13, (15, fig 2) or RADAR or LIDAR. The sensing devices 13, (15) look in a direction of intended travel and have output signals, e.g. images, which are processed by a controller 24 so as to determine a gradient of a slope (12) and/or recognition an obstacle such as kerbs or rocks etc. Having recognized the gradient and/or obstacle, the controller 24 uses shift maps to pre-select an appropriate launch gear ratio so that upon starting from rest the vehicle is adapted to the terrain. If an up-slope or a down-slope exceeds a threshold gradient or an obstacle exceeds a threshold height the pre-selected launch gear ratio is lower than normal. Reference is also made to a launch control system and to a vehicle having a launch control system.


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    Title :

    Multi-speed automatic vehicle transmission


    Contributors:
    JERGER ROB (author) / PERCY CRAIG (author)

    Publication date :

    2015-12-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F16H Getriebe , GEARING / 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



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