Adaptive cruise control system and method based on peripheral situations of vehicle

1. An adaptive cruise control (ACC) system comprising:

a peripheral environment detection sensor configured to detect a peripheral environment or situation of a host vehicle during an ACC process of the host vehicle; and

an electronic control unit (ECU) configured to autonomously perform acceleration limiting or deceleration control of the host vehicle according to an ACC target acceleration/deceleration amount suitable for the peripheral environment or situation detected by the peripheral environment detection sensor,

wherein the peripheral environment or situation comprises: a presence of peripheral vehicles within a predetermined distance in front and rear of the host vehicle in two lanes adjacent to a lane of the host vehicle, and an average speed of the peripheral vehicles within the predetermined distance in front and rear of the host vehicle in the two lanes adjacent to the lane of the host vehicle,

wherein the ECU is configured to perform the acceleration limiting or the decelerating control based on the average speed during the ACC, and as the average speed decreases, an ACC acceleration limited amount is controlled to increase,

wherein the peripheral environment or situation is traffic flow in peripheral lanes of the host vehicle,

wherein the ECU comprises:

a peripheral situation decision module configured to determine the peripheral situation detected by the peripheral environment detection sensor; and

a target acceleration/deceleration calculation module configured to calculate the ACC target acceleration/deceleration amount suitable for the determined peripheral situation,

wherein, if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are detected, the peripheral situation decision module calculates the average speed of the detected peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle, and

wherein the target acceleration/deceleration calculation module is configured to:

if a legacy ACC target acceleration is higher than zero “0”, calculate a limited acceleration ratio by multiplying the average speed of the peripheral vehicles by a weight;

calculate a last ACC target acceleration by multiplying the calculated limited acceleration ratio by the legacy ACC target acceleration; and

perform the ACC process according to the calculated last ACC target acceleration.

2. The ACC system according to claim 1 , wherein:

if only one lane from among peripheral lanes of the host vehicle is made available, the peripheral situation decision module calculates the average speed of peripheral vehicles located in the available lane.

3. The ACC system according to claim 2 , wherein:

if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are not detected, if a legacy ACC target acceleration is not higher than zero “0”, or if driver intention to perform handling of the host vehicle is detected, the ECU performs the ACC process according to the legacy ACC target acceleration.

4. The ACC system according to claim 1 , wherein:

if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are not detected, if the legacy ACC target acceleration is not higher than zero “0”, or if driver intention to perform handling of the host vehicle is detected, the ECU performs the ACC process according to the legacy ACC target acceleration.

5. An adaptive cruise control (ACC) system comprising:

a peripheral environment detection sensor configured to detect a peripheral environment or situation of a host vehicle during an ACC process of the host vehicle; and

an electronic control unit (ECU) configured to autonomously perform acceleration limiting or deceleration control of the host vehicle according to an ACC target acceleration/deceleration amount suitable for the peripheral environment or situation detected by the peripheral environment detection sensor,

wherein the peripheral environment or situation comprises: a presence of peripheral vehicles within a predetermined distance in front and rear of the host vehicle in two lanes adjacent to a lane of the host vehicle, and an average speed of the peripheral vehicles within the predetermined distance in front and rear of the host vehicle in the two lanes adjacent to the lane of the host vehicle,

wherein the ECU is configured to perform the acceleration limiting or the decelerating control based on the average speed during the ACC, and as the average speed decreases, an ACC acceleration limited amount is controlled to increase,

wherein the peripheral environment or situation is traffic flow in peripheral lanes of the host vehicle,

wherein the ECU comprises:

a peripheral situation decision module configured to determine the peripheral situation detected by the peripheral environment detection sensor; and

a target acceleration/deceleration calculation module configured to calculate the ACC target acceleration/deceleration amount suitable for the determined peripheral situation,

wherein, if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are detected, the peripheral situation decision module calculates the average speed of the detected peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle, and

wherein the target acceleration/deceleration calculation module is configured to:

if the average speed of the peripheral vehicles is equal to or less than a legacy ACC target speed by a predetermined speed, calculate a last ACC target speed by limiting an ACC target speed to a sum of the average speed of the peripheral vehicles and the predetermined speed; and

perform the ACC process according to the calculated last ACC target speed.

6. The ACC system according to claim 5 , wherein:

if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are not detected, if a legacy ACC target acceleration is not higher than zero “0”, or if driver intention to perform handling of the host vehicle is detected, the ECU performs the ACC process according to the legacy ACC target acceleration.

7. An adaptive cruise control (ACC) method comprising:

detecting a peripheral environment or situation of a host vehicle during an ACC process of the host vehicle;

calculating an ACC target acceleration/deceleration amount suitable for the detected peripheral environment or situation; and

autonomously performing acceleration limiting or deceleration control of the host vehicle according to the calculated ACC target acceleration/deceleration amount,

wherein the peripheral environment or situation comprises: a presence of peripheral vehicles within a predetermined distance in front and rear of the host vehicle in two lanes adjacent to a lane of the host vehicle, and average speed of the peripheral vehicles within the predetermined distance in front and rear of the host vehicle in the two lanes adjacent to the lane of the host vehicle,

wherein the acceleration limiting or decelerating control is performed based on the average speed during the ACC, and as the average speed decreases, an ACC acceleration limited amount is controlled to increase,

wherein the peripheral environment or situation is traffic flow in peripheral lanes of the host vehicle, and

wherein the method further comprises:

in the detecting the peripheral environment or situation of the host vehicle, if one or more peripheral vehicles present in the two lances adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are detected, calculating the average speed of the peripheral vehicles present in the two lances adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle;

determining whether a target acceleration calculated in a legacy ACC process is higher than zero “0”;

if a legacy ACC target acceleration is higher than zero “0”, calculating a limited acceleration ratio by multiplying the average speed of the peripheral vehicles by a parameter “K”;

calculating a last ACC target acceleration by multiplying the calculated limited acceleration ratio by the legacy ACC target acceleration; and

perform the ACC process according to the calculated last ACC target acceleration.

8. The ACC method according to claim 7 , wherein the calculating the average speed of the peripheral vehicles includes:

if only one lane from among peripheral lanes of the host vehicle is made available, calculating the average speed of peripheral vehicles located in the available lane.

9. The ACC method according to claim 8 , further comprising:

if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are not detected, if the legacy ACC target acceleration is not higher than zero “0”, or if driver intention to perform handling of the host vehicle is detected, performing the ACC process according to the legacy ACC target acceleration.

10. The ACC method according to claim 7 , further comprising:

if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are not detected, if the legacy ACC target acceleration is not higher than zero “0”, or if driver intention to perform handling of the host vehicle is detected, performing the ACC process according to the legacy ACC target acceleration.

11. An adaptive cruise control (ACC) method comprising:

detecting a peripheral environment or situation of a host vehicle during an ACC process of the host vehicle;

calculating an ACC target acceleration/deceleration amount suitable for the detected peripheral environment or situation; and

autonomously performing acceleration limiting or deceleration control of the host vehicle according to the calculated ACC target acceleration/deceleration amount,

wherein the peripheral environment or situation comprises: a presence of peripheral vehicles within a predetermined distance in front and rear of the host vehicle in two lanes adjacent to a lane of the host vehicle, and average speed of the peripheral vehicles within the predetermined distance in front and rear of the host vehicle in the two lanes adjacent to the lane of the host vehicle,

wherein the acceleration limiting or decelerating control is performed based on the average speed during the ACC, and as the average speed decreases, an ACC acceleration limited amount is controlled to increase,

wherein the peripheral environment or situation is traffic flow in peripheral lanes of the host vehicle, and

wherein the method further comprises:

in the detecting the peripheral environment or situation of the host vehicle, if one or more peripheral vehicles present in the two lances adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are detected, calculating the average speed of the peripheral vehicles present in the two lances adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle;

if the average speed of the peripheral vehicles is equal to or less than a legacy ACC target speed by a predetermined speed, calculating a last ACC target speed by limiting an ACC target speed to a sum of the average speed of the peripheral vehicles and the predetermined speed; and

perform the ACC process according to the calculated last ACC acceleration.

12. The ACC method according to claim 11 , further comprising:

if one or more peripheral vehicles present in the two lanes adjacent to the lane of the host vehicle within the predetermined distance in forward and backward directions of the host vehicle are not detected, if a legacy ACC target acceleration is not higher than zero “0”, or if driver intention to perform handling of the host vehicle is detected, performing the ACC process according to the legacy ACC target acceleration.