Method and system for generating lane changing trajectory of vehicle

1 . A method for generating a lane changing trajectory of a vehicle, comprising:

executing a lane changing function of the vehicle;

calculating a collision risk with a peripheral vehicle;

generating the lane changing trajectory such that a lateral speed of the vehicle at a start of the lane change changes according to the collision risk,

controlling the vehicle to drive along the generated lane changing trajectory, after the generating of the lane changing trajectory,

wherein the lane changing trajectory is generated such that, based on a mid time point of the lane change from a starting time point to an ending time point of the lane change, a graph of a lateral speed of the vehicle over time before the mid time point is to be asymmetrical with a graph of a lateral speed of the vehicle over time after the mid time point.

2 . The method of claim 1 , wherein the generating of the lane changing trajectory further comprises: determining whether the collision risk exceeds a predetermined first threshold value; and if the collision risk exceeds the first threshold value, generating the lane changing trajectory such that the lateral speed of the vehicle at the start of the lane change is smaller than a predetermined lateral speed.

3 . The method of claim 2 , wherein if the collision risk is equal to or less than the first threshold value, the lane changing trajectory is generated such that the lateral speed of the vehicle at the start of the lane change is greater than the predetermined lateral speed.

4 . The method of claim 1 , wherein in the generating of the lane changing trajectory, the lane changing trajectory is generated based on a spline curve using two 5th degree polynomials.

5 . The method of claim 1 , further comprising:

after controlling of the vehicle, recalculating the collision risk with the peripheral vehicle;

generating a lane returning trajectory of the vehicle if the collision risk with the peripheral vehicle exceeds a predetermined second threshold value by comparing the recalculated collision risk with the second threshold value; and

controlling the vehicle to return to an existing lane according to the generated lane return returning trajectory.

6 . The method of claim 1 , wherein the executing of the lane changing function is performed by operating a lane changing button installed at the vehicle, and the lane changing trajectory is generated such that the vehicle moves continuously without stopping in a lateral direction from a time point of operating the lane changing button to a time point when the lane change is completed.

7 . The method of claim 6 , wherein the generating of the lane changing trajectory comprises generating the lane changing trajectory such that the lane change is completed within a first predetermined time from the time point of operating the lane changing button.

8 . The method of claim 7 , wherein the generating of the lane changing trajectory comprises generating the lane changing trajectory such that the vehicle overlaps with one lane line of a neighboring lane within a second predetermined time from the time point of operating the lane changing button, and the lane change is completed within a third predetermined time from a time point when the overlapping with the one lane line begins.

9 . A system for generating a lane changing trajectory of a vehicle, comprising:

a sensor configured to detect surroundings of the vehicle;

a vehicle information detector configured to detect body information of the vehicle;

a lane changing button configured to execute a lane changing function of the vehicle; and

a controller configured to control the vehicle by generating the lane changing trajectory of the vehicle,

wherein the controller is configured to calculate a collision risk between the vehicle and a peripheral vehicle when the lane changing button is operated, to generate the lane changing trajectory such that a lateral speed of the vehicle at a start of a lane change changes according to the collision risk, and

to control the vehicle to drive along the generated lane changing trajectory, after the generating of the lane changing trajectory,

wherein the lane changing trajectory is generated such that, based on a mid time point of the lane change from a starting time point to an ending time point of the lane change, a graph of a lateral speed of the vehicle over time before the mid time point is to be asymmetrical with a graph of a lateral speed of the vehicle over time after the mid time point.

10 . The system of claim 9 , wherein the controller is configured to determine whether the collision risk exceeds a predetermined first threshold value, and to generate the lane changing trajectory such that the lateral speed of the vehicle at the start of the lane change is smaller than a predetermined lateral speed if the collision risk exceeds the first threshold value.

11 . The system of claim 10 , wherein the controller is configured to generate the lane changing trajectory such that the lateral speed of the vehicle at the start of the lane change is greater than the predetermined lateral speed if the collision risk is equal to or less than the first threshold value.

12 . The system of claim 9 , wherein the sensor comprises at least one of a front camera, a front radar, or a corner radar installed at the vehicle.

13 . The system of claim 9 , wherein the peripheral vehicle is a vehicle approaching from a rear side of a neighboring lane adjacent to a lane in which the vehicle is driving, and the controller is configured to calculate the collision risk between the vehicle and the peripheral vehicle from information obtained by the sensor and the vehicle information detector.

14 . The system of claim 9 , wherein the controller is configured to generate the lane changing trajectory such that the lane change is completed within a first predetermined time from a time point of operating the lane changing button.

15 . The system of claim 9 , further comprising an acceleration apparatus, a braking apparatus, and a steering apparatus,

wherein the controller is configured to control the vehicle according to the generated lane changing trajectory by controlling at least one of the acceleration apparatus, the braking apparatus, or the steering apparatus.