Vehicle control method having two clutches A, B (e.g. power shift / dual clutch) coupled to selectable gear ratios to transmit torque from an engine. A first gear ratio is selected and engaged via first clutch A to provide retardant torque / engine braking to vehicle wheels. A second gear ratio is pre selected via second clutch B, and subsequent engagement is modulated (clutch slipped) to provide further negative torque to the wheels. The selected gears may be forward (1st 6th) and reverse (RL, RH) ratios. Clutches A, B may be friction clutches. Method may be used when a vehicle is moving forwards or backwards down a slope / gradient. Initial gear selection may be changed during braking, i.e. from first forwards to first reverse, and second reverse to first forwards. Method steps may be prompted by transmission temperature threshold being reached to prevent clutch damage, or by performance threshold being reached to prevent clutch slip.


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    Title :

    Hill descent control


    Contributors:
    HOSE MARKUS (author)

    Publication date :

    2015-08-19


    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 / F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen



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