Patent ID: 8145374

Claim:
A method for dynamically controlling rollback in an electric vehicle including an electric motor for providing motive power to the electric vehicle, the electric motor rotatable in opposite directions corresponding to the forward or reverse motion of the vehicle, and a shift lever for selecting either forward or reverse motion of the vehicle, the method comprising: determining if a rollback condition exists; calculating a rollback acceleration of the vehicle when a rollback condition exists; determining a power request to control the rollback of the vehicle; driving the electric motor using the determined power request determining a rollback power assist request to control the rollback of the vehicle; determining a driver power request; and comparing the driver power request to the rollback power request and, when the driver power request is greater than the rollback assist power request, setting the power request equal to the driver power request or, when the driver power request is not greater than the rollback power request, setting the power request to the rollback assist power request.