| CPC B62D 6/002 (2013.01) [B62D 5/0463 (2013.01)] | 15 Claims |
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1. A system of controlling rear wheel steering of a vehicle, the system comprising:
a front wheel steering angle sensor configured to detect a front wheel steering angle of the vehicle;
a controller electrically connected to the front wheel steering angle sensor and configured to perform ramp-up steering control of rear wheels in the vehicle by generating a ramp-up steering command signal so that the rear wheels of the vehicle are steered at a designated ramp-up slope from a neutral position thereof to a target rear wheel steering angle determined as a value varied depending on the front wheel steering angle based on a signal from the front wheel steering angle sensor, when an ignition of the vehicle is turned on; and
a rear wheel steering motor electrically connected to the controller and configured to generate a rear wheel steering stroke in response to the ramp-up steering command signal from the controller,
wherein the controller is configured:
to confirm generation of the front wheel steering angle by receiving a signal from the front wheel steering angle sensor when the ignition of the vehicle is turned on, and to determine the target rear wheel steering angle determined as a value varied depending on the front wheel steering angle,
to determine a commanded rear wheel steering angle for the ramp-up steering control to steer the rear wheels according to the designated ramp-up slope from the neutral position thereof to the target rear wheel steering angle for a predetermined time period, and to apply a driving signal corresponding to the determined commanded rear wheel steering angle to the rear wheel steering motor, and
to determine whether to continue to perform the ramp-up steering control and to complete the ramp-up steering control executed so that the rear wheels are steered according to the designated ramp-up slope from the neutral position thereof to the target rear wheel steering angle for the predetermined time period, and
wherein, in the determining of whether to continue or to complete the ramp-up steering control, when a ramp-up update count exceeds a value acquired by dividing a ramp-up cycle by a sampling time in the ramp-up cycle, the controller is configured to conclude that the ramp-up steering control is completed.
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