Methods and controllers for controlling engine speed to reduce NVH that occurs in conjunction with transmission shifts are described. In some embodiments, when a transmission shift to a target gear is expected, a target engine speed appropriate for the target gear is first determined. A target rate of change of the engine speed is calculated from the initial engine speed and target engine speed in conjunction with a target transition time. A target torque is then calculated from the target rate of change of engine speed. A target firing fraction or induction ratio are determined that are desired for use with the target engine speed based on the target torque. The transition to the target engine speed and target firing fraction or induction ratio are completed before the gear shift is completed. The described approaches are well suited for use during skip fire or other cylinder output level modulation operation of the engine.


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    Title :

    Managing engine firing fraction changes during gear shifts


    Contributors:

    Publication date :

    2023-06-27


    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 / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen



    Managing engine firing fraction changes during gear shifts

    CAI XIAOPING / SERRANO LOUIS J / PHILLIPS ANDREW W | European Patent Office | 2020

    Free access

    MANAGING ENGINE FIRING FRACTION CHANGES DURING GEAR SHIFTS

    CAI XIAOPING / SERRANO LOUIS J / PHILLIPS ANDREW W | European Patent Office | 2020

    Free access

    MANAGING ENGINE FIRING FRACTION CHANGES DURING GEAR SHIFTS

    CAI XIAOPING / SERRANO LOUIS J / PHILLIPS ANDREW W | European Patent Office | 2020

    Free access

    Managing engine firing fraction changes during gear shifts

    CAI XIAOPING / SERRANO LOUIS J / PHILLIPS ANDREW W | European Patent Office | 2020

    Free access

    MANAGING ENGINE FIRING FRACTION CHANGES DURING GEAR SHIFTS

    SERRANO LOUIS J / CAI XIAOPING / PHILLIPS ANDREW W | European Patent Office | 2023

    Free access