Parking brake fail safety control system for vehicle having electric-axle and method thereof
AssigneesHyundai Motor Company, Kia Corporation
InventorJune Oh
Life of this patent
Estimating the term…
Abstract
A parking brake fail safety control system and method for a vehicle having an electric-axle, may enable safe parking braking on a level ground, a slope, etc. By controlling the torque from a first motor configured for a rear wheel-first electric-axle and the torque from a second motor configured for a rear wheel-second electric-axle to have the same magnitude in opposite directions and by increasing/decreasing the torque from the first motor and the torque from the second motor, depending on a change of wheel speed when a parking brake fails.
Claims17
A parking brake fail safety control system for a vehicle having an electric-axle, the system comprising:
- a parking brake switch of a vehicle and configured to be turned on in response to a driver's operation;
- a wheel speed sensor of the vehicle and configured for detecting a change in wheel speed of the vehicle;
- a first motor of the vehicle and included in a rear wheel-first electric-axle of the vehicle, wherein the electric-axle of the vehicle includes the rear wheel-first electric-axle;
- a second motor of the vehicle and included in a rear wheel-second electric-axle of the vehicle, wherein the electric-axle of the vehicle further includes the rear wheel-second electric-axle;
- and
- a controller of the vehicle and electrically connected to the parking brake switch, the wheel speed sensor, the first motor and the second motor and configured for determining that a parking brake of the vehicle fails and controlling torque of the first motor and torque of the second motor to have a same magnitude in opposite directions upon determining that there is the change in the wheel speed according to a signal received from the wheel speed sensor after receiving a turning-on signal of the parking brake switch,
- wherein the wheel speed sensor, the first motor, the second motor and the controller are all mounted in one vehicle.
A parking brake fail safety control method for a vehicle having an electric-axle, the method comprising:
- determining, by a controller, whether a parking brake switch of the vehicle and electrically connected to the controller is turned on;
- determining, by the controller, whether a parking brake of the vehicle fails;
- and
- controlling, by the controller, torque of a first motor of the vehicle and included in a rear wheel-first electric-axel of the vehicle and torque of a second motor of the vehicle and included in a rear wheel-second electric-axle of the vehicle to have a same magnitude in opposite directions, when the controller determines that the parking brake fails,
- wherein the electric-axle of the vehicle includes the rear wheel-first electric-axle and the rear wheel-second electric-axle,
- wherein the first motor, the second motor and the controller are all mounted in one vehicle.
A parking brake fail safety control system for a vehicle having an electric-axle, the system comprising:
- a parking brake switch of a vehicle configured to be turned on in response to a driver's operation;
- a wheel speed sensor of the vehicle configured for detecting a change in wheel speed of the vehicle;
- a first motor of the vehicle included in a rear wheel-first electric-axle of the vehicle, wherein the electric-axle of the vehicle includes the rear wheel-first electric-axle;
- a second motor of the vehicle included in a rear wheel-second electric-axle of the vehicle, wherein the electric-axle of the vehicle further includes the rear wheel-second electric axle;
- and
- a controller electrically connected to the parking brake switch, the wheel speed sensor, the first motor and the second motor and configured for determining that a parking brake of the vehicle fails and controlling torque of the first motor and torque of the second motor to have a same magnitude in opposite directions until the wheel speed becomes zero upon determining that there is the change in the wheel speed according to a signal received from the wheel speed sensor after receiving a turning-on signal of the parking brake switch,
- wherein the parking brake switch, the wheel speed sensor, the first motor, the second motor and the controller are all mounted in one vehicle.
Dependencies are inferred from the claim text.