Vehicle park system and method for shift out of park assist
First Claim
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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Accused Products
Abstract
A method of controlling a vehicle park system in a shift out of park includes receiving a shift out of park request, and commanding a park actuator to rotate an actuator shaft operatively connected to a park pawl movable from an engaged position in which the park pawl is engaged with a park gear, to a disengaged position in which the park pawl is disengaged from the park gear. The method includes determining whether a detent lever operatively connected to the park pawl has moved towards an out of park position within a predetermined period of time after commanding the park actuator to rotate the actuator shaft, and then commanding an electric propulsion motor to apply torque to the transmission output shaft to assist the park actuator if the detent lever has not moved towards the out of park position within the predetermined period of time.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle park system for a vehicle having an electric propulsion motor connectable with a transmission output shaft, the vehicle park system comprising:
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a park gear mounted on the transmission output shaft; a park pawl movable from an engaged position in which the park pawl is engaged with the park gear to a disengaged position in which the park pawl is disengaged from the park gear; a park actuator having an actuator shaft; a detent lever mounted on the actuator shaft and operatively connected to the park pawl; wherein the park actuator is configured to rotate the actuator shaft to move the detent lever from a park position in which the park pawl is in the engaged position, to an out of park position in which the park pawl is in the disengaged position; an electronic controller operatively connected to the electric propulsion motor and the park actuator, and, in response to receiving a shift out-of-park request, configured to; command the park actuator to rotate the actuator shaft; determine 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 command 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 towards the out of park position within the predetermined period of time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification