Control method of a rear wheel steering system
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorJun Wook Oh
Life of this patent
Estimating the term…
Abstract
A control method of a rear wheel steering system prevents a sudden change in a rear wheel steering control amount when an error occurs in a wheel speed sensor. The control method detects an error in wheel speed sensors based on output values of the wheel speed sensors. A vehicle speed is estimated by using output values of remaining normal wheel speed sensors except for an output value of an abnormal wheel speed sensor where an error is detected, when an error in the wheel speed sensor is detected. Rear wheels are steered and controlled based on the estimated vehicle speed.
Claims9
A control method of a rear wheel steering system, the control method comprising:
- detection of an error among four wheel speed sensors by a controller based on output values of the wheel speed sensors;
- estimation of a vehicle speed using output values of remaining normal wheel speed sensors except for an output value of an abnormal wheel speed sensor where the error is detected, when the controller detects the error in the abnormal wheel speed sensor;
- and
- control of steering of rear wheels by the controller based on the estimated vehicle speed,
- wherein in the estimation of a vehicle speed, when one abnormal wheel speed sensor of the four wheel speed sensors is detected, an output value of the abnormal wheel speed sensor is replaced with an average value of output values of two normal wheel speed sensors except for a remaining normal wheel speed sensor disposed at a position diagonal to the abnormal wheel speed sensor.
A control method of a rear wheel steering system of a vehicle, the control method comprising:
- detecting, by a controller, at least one abnormal wheel speed sensor from among four wheel speed sensors as an error based on output values of the wheel speed sensors;
- determining, when the controller detects the error, an estimated speed value by estimating a vehicle speed using output values of remaining normal wheel speed sensors, excluding an output value of the abnormal wheel speed sensor where the error is detected;
- and
- controlling, by the controller, steering of rear wheels of the vehicle based on the estimated vehicle speed,
- wherein in the estimation of a vehicle speed, when one abnormal wheel speed sensor of the four wheel speed sensors is detected, an output value of the one abnormal wheel speed sensor is replaced with an average value of output values of two normal wheel speed sensors, excluding a remaining normal wheel speed sensor that is disposed at a position diagonal to the abnormal wheel speed sensor on the vehicle.
Dependencies are inferred from the claim text.