Method of controlling fine steering of independent steering apparatuses

1 . A method of controlling fine steering of independent steering apparatuses for a vehicle, comprising:

determining, by a controller, a parallel mode input;

performing rotation of the independent steering apparatuses when the controller receives the parallel mode input;

determining, by the controller, a moving direction of the vehicle in response to a rotating direction of a steering wheel;

after setting the moving direction of the vehicle, determining, by the controller, whether the vehicle enters a fine steering mode; and

performing, by the controller, steering angle input to the independent steering apparatuses located at a front end in the moving direction of the vehicle.

2 . The method of claim 1 , wherein, determining the moving direction of the vehicle comprises:

determining whether a rotation angle equal to or greater than a first set angle is applied to the steering wheel.

3 . The method of claim 2 , wherein determining whether the vehicle enters the fine steering mode comprises:

after the rotation angle equal to or greater than the first set angle is applied to the steering wheel, determining whether the steering wheel returns to a second set angle or less; and

when an additional steering input is applied to the steering wheel after the steering wheel returns to the second set angle or less, determining that the vehicle enters the fine steering mode.

4 . The method of claim 3 , wherein upon determining that the steering wheel does not return to the second set angle or less after the rotation angle equal to or greater than the first set angle is applied to the steering wheel, the independent apparatuses maintain a parallel mode.

5 . The method of claim 3 , wherein upon determining that the additional steering input is not applied to the steering wheel after the steering wheel returns to the second set angle or less, the independent apparatuses maintain a parallel mode.

6 . The method of claim 3 , wherein determining that the vehicle enters the fine steering mode comprises:

performing fine steering of at least one independent steering apparatus, among the independent steering apparatuses, located at one end facing the moving direction in response to additional input to the steering wheel.

7 . The method of claim 1 , wherein, in performing the rotation of the independent steering apparatuses when the controller receives the parallel mode input, the controller controls the independent steering apparatuses to have a steering angle corresponding to a direction perpendicular to a longitudinal direction of the vehicle.

8 . A method of controlling fine steering of independent steering apparatuses, comprising:

determining, by a controller, a parallel mode input;

performing rotation of the independent steering apparatuses of a vehicle when the controller receives the parallel mode input;

determining, by the controller, a moving direction of the vehicle in response to a rotating direction of a steering wheel of the vehicle;

after setting the moving direction of the vehicle, determining, by the controller, whether the vehicle enters a fine steering mode;

determining, by the controller, whether an additional input is applied to the steering wheel upon determining that the vehicle enters the fine steering mode; and

after the vehicle enters the fine steering mode, performing, by the controller, steering angle input to the independent steering apparatuses located at a front end in the moving direction of the vehicle in response to the additional input to the independent steering wheel.

9 . The method of claim 8 , wherein determining the moving direction of the vehicle comprises:

determining whether a rotation angle equal to or greater than a first set angle is applied to the steering wheel.

10 . The method of claim 9 , wherein determining whether the vehicle enters the fine steering mode comprises:

after the rotation angle equal to or greater than the first set angle is applied to the steering wheel, determining whether the steering wheel returns to a second set angle or less; and

when an additional steering input is applied to the steering wheel after the steering wheel returns to the second set angle or less, determining that the vehicle enters the fine steering mode.

11 . The method of claim 10 , wherein upon determining that the steering wheel does not return to the second set angle or less after the rotation angle equal to or greater than the first set angle is applied to the steering wheel, the independent apparatuses maintain a parallel mode.

12 . The method of claim 10 , wherein upon determining that the additional steering input is not applied to the steering wheel after the steering wheel returns to the second set angle or less, the independent apparatuses maintain a parallel mode.

13 . The method of claim 10 , wherein determining that the vehicle enters the fine steering mode comprises:

performing fine steering of at least one independent steering apparatus, among the independent steering apparatuses, located at one end facing the moving direction in response to the additional input to the steering wheel.

14 . The method of claim 8 , wherein, in performing the rotation of the independent steering apparatuses when the controller receives the parallel mode input, the controller controls the independent steering apparatuses to have a steering angle corresponding to a direction perpendicular to a longitudinal direction of the vehicle.