Vehicle control system
When an abnormality occurs in the main ECU, assist control A or B is executed by the substitute ECU as emergency traveling path control. The assist control A is executed when the target path TP_RS does not intersect the white lane. In the assist control A, feedforward control is executed for making the subject vehicle M travel along the target path TP_RS. In the assist control A, feedback control is also executed to keep the distance LD_CL in the transverse direction from the center of the traveling lane to the reference position. The assist control B is executed when the target path TP_RS intersects the white lane. In the assist control B, only the feedforward control is executed in which the subject vehicle M is controlled to travel along the target path TP_RS.
1. A vehicle control system configured to autonomously control a vehicle to travel along a road, the vehicle control system comprising:
a main controller configured to calculate a pre-abnormality target path;
a substitute controller configured to:
calculate the pre-abnormality target path when an abnormality occurs in the main controller;
acquire information on a lane line around the vehicle;
store backup data of the pre-abnormality target path calculated by the main controller;
calculate, based on the backup data, a first target path based on the backup data which is the pre-abnormality target path just before the occurrence of the abnormality in the main controller;
calculate a first feedforward operation amount of steering angle which is a feedforward operation amount for making the vehicle travel along the first target path;
calculate, based on the information on lane line, a first feedback operation amount which is a feedback operation amount for keeping a distance in a lateral direction from the vehicle to a reference line of a traveling lane along which the vehicle travels;
determine whether or not an execution of a lane change by a vehicle is detected;
based on the execution of the lane change by the vehicle not being detected, correct the first feedforward operation amount with the first feedback operation amount and control the vehicle to travel based on the corrected first feedforward amount; and
based on the execution of the lane change by the vehicle being detected, not correct the first feedforward operation amount with the first feedback operation amount and control the vehicle to travel based on the uncorrected first feedforward amount.
2. The vehicle control system according to claim 1 ,
wherein the substitute controller is further configured to:
calculate a second target path which is the pre-abnormality target path for maintaining the distance in the lateral direction at the occurrence of the abnormality;
based on the execution of the lane change being detected, judge progress of first path control in which the vehicle is controlled to travel along the first target path, based on one of a combination of an elapsed time since the occurrence of the abnormality and yaw angle and on a combination of the elapsed time and the distance in the lateral direction; and
based on a judgment that the progress corresponds to a situation before or a predetermined amount of time after a start of the first path control, start to execute second path control in which the vehicle is controlled to travel along the second target path.
3. The vehicle control system according to claim 2 ,
wherein the substitute controller is configured to:
calculate a second feedforward operation amount of steering angle for making the vehicle travel along the second target path;
calculate, based on the information on lane line, a second feedback operation amount for keeping the distance in the lateral direction at the occurrence of the abnormality;
start to execute the second path control based on the second feedforward operation amount; and
start to execute the correction of the second feedforward operation amount with the second feedback operation amount after the start of the second path control.
4. The vehicle control system according to claim 1 ,
wherein the substitute controller is further configured to:
calculate a third target path which is the pre-abnormality target path just before the occurrence of the abnormality and also is not the pre-abnormality target path for lane change;
based on the execution of the lane change being detected, judge progress of first path control in which the vehicle is controlled to travel along the first target path, based on one of a combination of an elapsed time since the occurrence of the abnormality and yaw angle and a combination of the elapsed time and the distance in the lateral direction;
based on a judgement that the progress corresponds to a situation before or a predetermined amount of time after the start of the first path control, start to execute third path control in which the vehicle is controlled to travel along the third target path.
5. The vehicle control system according to claim 4 ,
wherein the substitute controller is configured to:
calculate a third feedforward operation amount of steering angle for making the vehicle travel along the third target path;
calculate, based on the information on the lane line, a third feedback operation amount for keeping the distance in the lateral direction at the occurrence of the abnormality;
start to execute the third path control based on the third feedforward operation amount; and
start to execute the correction of the third feedforward operation amount with the third feedback operation amount after the start of the third path control.