Methods and systems for regulating hill descent speed of an...

Details Methods and systems for regulating hill descent speed of an... Methods and systems for regulating hill descent speed of an...

2008-03-06

2011-10-11

Pang, Roger (Department: 3655)

Interrelated power delivery controls, including engine control

Electric engine

C180S065310, C303S152000

Reexamination Certificate

active

08033955

ABSTRACT:
A method for regulating the speed at which an electric vehicle descends a hill includes determining a position of a shift lever and determining if the vehicle accelerator and/or the vehicle brake are depressed. If the vehicle is in either drive or reverse and neither the vehicle accelerator nor the vehicle brake is depressed, a change in the motor speed is determined based on the current motor speed and a reference motor speed. The current braking assist is then adjusted based on the change in the motor speed such that the motor speed, and therefore the speed of the electric vehicle, remains constant as the vehicle descends the hill.

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