A vehicle includes an engine having autostart functionality, a source of fluid pressure when the engine is off, a flow control solenoid that outputs a variable clutch pressure, a transmission, an electric motor, and a controller. The transmission includes a clutch in fluid communication with the solenoid. The clutch applies via the clutch pressure to establish a first gear launch state. The motor is powered via a rechargeable energy storage system. The controller executes a method to transmit pulse width modulation (PWM) control signals to the solenoid upon detection of a set of conditions triggering the autostart event to lower clutch pressure to a first calibrated level. Restart of the engine is commanded, and the clutch pressure increases toward a second calibrated level while engine speed is increasing. The controller discontinues the PWM control signals and increases clutch pressure to line pressure when the input speed exceeds a calibrated threshold.


    Access

    Download


    Export, share and cite



    Title :

    Transmission oil pressure control during engine autostart


    Contributors:

    Publication date :

    2015-06-30


    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 / F16H Getriebe , GEARING



    ENGINE AUTOSTART SOURCE SELECTION

    CHRISTMAN ANTHONY / SIME KARL ANDREW | European Patent Office | 2015

    Free access

    Engine autostart source selection

    CHRISTMAN ANTHONY / SIME KARL ANDREW | European Patent Office | 2016

    Free access

    ENGINE AUTOSTART SOURCE SELECTION

    CHRISTMAN ANTHONY / SIME KARL ANDREW | European Patent Office | 2015

    Free access

    Cloud-Enabled Vehicle Autostart Monitoring

    CRAWFORD LAURA / HOPKINS GARTH WESLEY / KHAMHARN ODDY et al. | European Patent Office | 2023

    Free access

    Cloud-Enabled Vehicle Autostart Monitoring

    CRAWFORD LAURA / HOPKINS GARTH WESLEY / KHAMHARN ODDY et al. | European Patent Office | 2019

    Free access