Method for controlling an automatic transmission of a motor vehicle
First Claim
1. A method of controlling an automatic transmission of a vehicle, in which a hold gear function is activated by a driver request and deactivated depending on a return condition, the method comprising the step of:
- when the driver signals the request for the hold gear function, activating the hold gear function with a transmission control unit to prevent a gear shift;
upon activation of the hold gear function, if the vehicle is in one of a push condition or a pull condition, defining one of the push condition and the pull condition as a temporary operating state of the vehicle and defining another of the push condition and the pull condition and vehicle travel on level ground as a termination condition;
maintaining the hold gear function as long as the temporary operating state of the vehicle is present;
determining the return condition if the termination condition occurs; and
deactivating the hold gear function if the return condition occurs.
1 Assignment
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Accused Products
Abstract
A method of controlling an automatic transmission of a vehicle in which a hold gear function is activated by a driver request and deactivated depending on a return condition. The method comprises the step of (a) determining the return condition by a change in operating state, and (b) deactivating the hold gear function if a temporary operating state, for which the hold function is requested, ends and a change takes place between one of uphill driving and downhill driving and between driving one of up and down a hill and driving on a same plane.
28 Citations
6 Claims
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1. A method of controlling an automatic transmission of a vehicle, in which a hold gear function is activated by a driver request and deactivated depending on a return condition, the method comprising the step of:
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when the driver signals the request for the hold gear function, activating the hold gear function with a transmission control unit to prevent a gear shift; upon activation of the hold gear function, if the vehicle is in one of a push condition or a pull condition, defining one of the push condition and the pull condition as a temporary operating state of the vehicle and defining another of the push condition and the pull condition and vehicle travel on level ground as a termination condition; maintaining the hold gear function as long as the temporary operating state of the vehicle is present; determining the return condition if the termination condition occurs; and deactivating the hold gear function if the return condition occurs. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling an automatic transmission of a vehicle, in which a hold gear function is activated by a driver request and deactivated depending on a return condition, the method comprising the step of:
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activating the hold gear function, via a transmission control unit, to prevent a gear shift, when the driver signals the request for the hold gear function; upon activation of the hold gear function, determining if the vehicle is traveling one of uphill or downhill, maintaining the hold gear function as long as the vehicle continues to travel one of uphill or downhill; and only deactivating the hold gear function if one of the following occurs; (a) the vehicle begins traveling on level ground, (b) the vehicle begins traveling downhill, if the vehicle was traveling uphill when the hold gear function was activated, or (c) the vehicle begins traveling uphill, if the vehicle was traveling downhill when the hold gear function was activated.
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Specification