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Vehicle park system and method for shift out of park assist

  • US 10,571,023 B2
  • Filed: 07/24/2018
  • Issued: 02/25/2020
  • Est. Priority Date: 07/24/2018
  • Status: Active Grant
First Claim
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1. A method of controlling a vehicle park system of a vehicle having an electric propulsion motor connectable with a transmission output shaft, the method comprising:

  • receiving, via an electronic controller, a shift out of park request;

    commanding, via the electronic controller, a park actuator to rotate an actuator shaft;

    wherein a detent lever is mounted on the actuator shaft and is operatively connected to a park pawl;

    wherein the detent lever is movable from a park position in which the park pawl is engaged with a park gear mounted on the transmission output shaft, to an out of park position in which the park pawl is disengaged from the park gear;

    determining whether the detent lever has moved towards the out of park position within a predetermined period of time after commanding the park actuator to rotate the actuator shaft; and

    commanding the electric propulsion motor to apply torque to the transmission output shaft to assist the park actuator with unloading the park pawl if the detent lever has not moved toward the out of park position within the predetermined period of time.

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