Automatic driving controlling system and method

1. An automatic driving controlling system comprising:

a speed sensor that detects a vehicle speed;

a yaw rate sensor that detects a yaw rate of the vehicle;

a controller configured: to calculate a target yaw rate that is required to drive the vehicle to a target point and calculates a real-time target yaw rate that is required to drive the vehicle to the target point by comparing a yaw rate that is detected by the yaw rate sensor in real time with the target yaw rate;

to calculate a target lateral acceleration that is required to drive the vehicle to the target point by using the vehicle speed and the target yaw rate, and calculates a real-time target lateral acceleration that is required to drive the vehicle to the target point by using the vehicle speed and the real-time target yaw rate; and

to determine whether or not the real-time target lateral acceleration is out of a range between an upper limit threshold value and a lower limit threshold value of the target lateral acceleration while an automatic driving mode that automatically controls the driving of the vehicle is in progress,

wherein the controller terminates, if the real-time target lateral acceleration is out of the range between the upper limit threshold value and the lower limit threshold value, the automatic driving mode for the automatic driving control of the vehicle so that the driver takes control of the vehicle to drive.

2. The automatic driving controlling system of claim 1 , wherein the range between the upper limit threshold value and the lower limit threshold values is a predetermined value in consideration of a physical limit of the vehicle.

3. The automatic driving controlling system of claim 2 , wherein the physical limit includes at least one of a maximum range of an acceleration and a deceleration of the vehicle, a distance between a position of the vehicle and the target point, and road conditions.

4. An automatic driving controlling method comprising:

detecting, by a speed sensor, a vehicle speed;

detecting, by a yaw rate sensor, a yaw rate of the vehicle;

calculating, by a controller, a target yaw rate that is required to drive the vehicle to a target point;

calculating, by the controller, a target lateral acceleration that is required to drive the vehicle to the target point by using the vehicle speed and the target yaw rate;

controlling, by the controller, the driving of the vehicle according to the target lateral acceleration;

calculating, by the controller, a real-time target yaw rate that is required to drive the vehicle to the target point by comparing a yaw rate that is detected in real time with the target yaw rate while an automatic driving mode for automatically controlling the driving of the vehicle is in progress;

calculating, by the controller, a real-time target lateral acceleration that is required to drive the vehicle to the target point by using the vehicle speed and the real-time target yaw rate;

determining, by the controller, whether or not the real-time target lateral acceleration is out of a range between an upper limit threshold value and a lower limit threshold value of the target lateral acceleration; and

terminating, by the controller, if the real-time target lateral acceleration is out of the range between the upper limit threshold value and the lower limit threshold value, the automatic driving mode for the automatic driving control of the vehicle so that the driver takes control of the vehicle to drive.

5. The method of claim 4 , wherein the range between the upper limit threshold value and the lower limit threshold values is a predetermined value in consideration of a physical limit of the vehicle.

6. The method of claim 5 , wherein the physical limit includes at least one of a maximum range of an acceleration and a deceleration of the vehicle, a distance between a position of the vehicle and the target point, and road conditions.