Methods and Systems for Regulating Hill Descent Speed of an Electric Vehicle
First Claim
1. A method for regulating the hill descent speed of an electric vehicle, the method comprising:
- determining if a freewheel condition exists;
determining if a motor speed is greater than a threshold value;
determining a change in the motor speed when a freewheel condition exists and the motor speed is greater than a threshold value; and
adjusting a current braking assist based on the determined change in the motor speed such that the motor speed is maintained at or restored to a reference motor speed thereby regulating the speed of the electric vehicle.
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Accused Products
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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Citations
20 Claims
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1. A method for regulating the hill descent speed of an electric vehicle, the method comprising:
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determining if a freewheel condition exists; determining if a motor speed is greater than a threshold value; determining a change in the motor speed when a freewheel condition exists and the motor speed is greater than a threshold value; and adjusting a current braking assist based on the determined change in the motor speed such that the motor speed is maintained at or restored to a reference motor speed thereby regulating the speed of the electric vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for regulating the hill descent speed of an electric vehicle, the method comprising:
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determining a position of a shift lever; determining if a brake pedal is depressed; determining if an accelerator pedal is depressed; determining if a motor speed is greater than a threshold value; determining a change in the motor speed when the position of the shift lever is in a position to drive the vehicle in a forward or reverse direction, neither of the brake pedal or accelerator pedal are depressed, and the motor speed is greater than a threshold value, wherein determining a change in the motor speed comprises comparing a current motor speed to a reference motor speed and comparing a current braking assist to a maximum allowable braking assist and/or a base braking assist; and adjusting the current braking assist when a change in the motor speed is determined, wherein the current braking assist is adjusted based on the determined change in the motor speed such that the motor speed is maintained at or restored to the reference motor speed thereby regulating the speed of the electric vehicle. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A control system for regulating the hill descent speed of an electric vehicle, the system comprising:
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a motor speed/position sensor; a brake pedal position sensor; an accelerator pedal position sensor; a shift lever position sensor; and a controller, wherein the motor speed/position sensor, the brake pedal position sensor, the accelerator position sensor, and the shift lever position sensor are operatively connected to the controller and the controller is programmed to selectively apply braking assist based on signals received from the motor speed/position sensor, the brake pedal position sensor, the accelerator position sensor, and the shift lever position sensor thereby regulating the hill descent speed of the electric vehicle. - View Dependent Claims (20)
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Specification