A vehicle powertrain control technique includes obtaining, by a controller, a set of parameters each indicative of a gear shift operation for an automatic transmission. Cased on the set of parameters, the controller detects whether a gear shift operation of the automatic transmission is imminent. In response to detecting that the gear shift operation of the automatic transmission is imminent, the controller (i) determines a desired reduction in powertrain output torque for performing the gear shift operation and (ii) controls the powertrain to temporarily reduce its torque output via a technique other than spark retardation. After reducing the powertrain output torque, the controller commands the automatic transmission to perform the gear shift operation. The temporary powertrain output torque reduction is achieved by controlling a variable valve control (VVC) system of an engine, such as commanding a lower valve lift profile, or decreasing power supplied to an electric motor.


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    Title :

    GEAR SHIFT SCHEDULING USING VARIABLE VALVE LIFT/ACTUATION


    Contributors:

    Publication date :

    2018-10-18


    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



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