A hydraulically controlled park system disengages a parking pawl in response to engagement of particular shift elements. When the vehicle is one a grade, greater force may be required to dis-engage the pawl, potentially leading to a failure to dis-engage. The controller avoids this failure by engaging an uphill gear ratio and controlling the transmission input torque to transfer load from the parking pawl to the gearing prior to engaging the shift elements that dis-engage the pawl. Following dis-engagement of the parking pawl, the transmission is in a tie-up condition in which the output shaft is held stationary by shift elements. The controller transitions from this tie-up condition to the selected gear ratio by releasing shift elements.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Method for disengaging hydraulic park


    Beteiligte:

    Erscheinungsdatum :

    2020-11-10


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    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



    Method for disengaging hydraulic park without engine power

    HATHAWAY RICHARD / TUMAVITCH JEFFREY JAMES / PHAM THAN et al. | Europäisches Patentamt | 2020

    Freier Zugriff

    Method For Disengaging Hydraulic Park Without Engine Power

    HATHAWAY RICHARD / TUMAVITCH JEFFREY JAMES / PHAM THAN et al. | Europäisches Patentamt | 2019

    Freier Zugriff

    Anti-disengaging safety cable disengaging hook

    GAO JIN / ZHANG QIRONG / ZHOU BING et al. | Europäisches Patentamt | 2021

    Freier Zugriff

    Hydraulic automatic beam grabbing emergency pin disengaging device and method

    LIU WENZHONG / ZHANG ZHAOLI / BAO TANGWEI et al. | Europäisches Patentamt | 2023

    Freier Zugriff

    Methods and systems for engaging and disengaging a vehicle park state

    FRAIT STEVEN ANATOLE | Europäisches Patentamt | 2020

    Freier Zugriff