A method and control system for controlling an electric traction motor of a vehicle, the control system comprising one or more controllers, wherein the control system is configured to: limit (406) a rate of change of torque requested from the electric traction motor for changing speed towards a speed target, in dependence on a lash crossing protection rate limiter; upon removal (408) of the limit prior to the speed reaching the speed target, inhibit (410) initial increase of a torque requested from the electric traction motor for changing speed towards the speed target; and control the torque requested from the electric traction motor after removal of the limit to change speed towards the speed target, using proportional torque and integrator torque and optional derivative torque. The speed target may be a vehicle creep speed target, or an engine idle speed target associated with vehicle creep. An advantage to the invention is reducing vehicle jerk because the torque is inhibited from sharply increasing following removal of the lash crossing protection rate limiter.


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    Title :

    Hybrid vehicle speed and torque control



    Publication date :

    2022-07-20


    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 / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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    Free access