Electronic park brake system for electric vehicles
First Claim
1. In an electric vehicle having a drive wheel and an electric motor for driving the drive wheel, a method of securing the electric vehicle from unwanted movement when the electric vehicle is parked, the method comprising the steps of:
- (a) placing the electric vehicle in an electronic park brake mode when the electric vehicle is in an initial parked position;
(b) automatically detecting that the electric vehicle is rolling from the initial parked position; and
(c) responsive to automatic detection that the electric vehicle is rolling from the initial parked position in step (b), automatically causing the electric motor to apply a reverse torque to the drive wheel to return the electric vehicle to the initial parked position or automatically causing the electric motor to lock the drive wheel to inhibit further movement of the electric vehicle.
7 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus are provided for securing an electric vehicle from unwanted movement when the electric vehicle is parked. The electric vehicle includes a drive wheel and an electric motor for driving the drive wheel. The method includes the steps of: (a) placing the electric vehicle in an electronic park brake mode; (b) automatically detecting that the electric vehicle is rolling from an initial position; and (c) automatically causing the electric motor to apply a reverse torque to the drive wheel to return the electric vehicle to the initial position or automatically causing the electric motor to lock the drive wheel to inhibit further movement of the electric vehicle.
10 Citations
24 Claims
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1. In an electric vehicle having a drive wheel and an electric motor for driving the drive wheel, a method of securing the electric vehicle from unwanted movement when the electric vehicle is parked, the method comprising the steps of:
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(a) placing the electric vehicle in an electronic park brake mode when the electric vehicle is in an initial parked position; (b) automatically detecting that the electric vehicle is rolling from the initial parked position; and (c) responsive to automatic detection that the electric vehicle is rolling from the initial parked position in step (b), automatically causing the electric motor to apply a reverse torque to the drive wheel to return the electric vehicle to the initial parked position or automatically causing the electric motor to lock the drive wheel to inhibit further movement of the electric vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electric vehicle, comprising:
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a battery system for powering the electric vehicle; a drive wheel; an electric motor mechanically coupled to the drive wheel for driving the drive wheel; and a vehicle control unit for controlling operation of the electric motor through a motor controller, the vehicle control unit operable to secure the electric vehicle from unwanted movement when the electric vehicle is parked, the vehicle control unit configured to; (a) place the electric vehicle in an electronic park brake mode when the electric vehicle is in an initial parked position; (b) automatically detect that the electric vehicle is rolling from the initial parked position; and (c) responsive to automatic detection that the electric vehicle is rolling from the initial parked position in step (b), automatically cause the electric motor to apply a reverse torque to the drive wheel to return the electric vehicle to the initial parked position or automatically cause the electric motor to lock the drive wheel to inhibit further movement of the electric vehicle. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification