ALGORITHMS FOR AVOIDING AUTOMOTIVE CRASHES AT LEFT AND RIGHT TURN INTERSECTIONS

• US 20170113665A1
• Filed: 10/27/2015
• Published: 04/27/2017
• Est. Priority Date: 10/27/2015
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: ELVITIGALA, THANURA RANMAL, MUDALIGE, UPALI PRIYANTHA
• Granted Patent: US 9,751,506 B2
• Time in Patent Office: Days
• CPC Class Codes: B60T 2201/022 Collision avoidance systems
• CPC Class Codes: B60T 7/22 initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle , or by means of contactless obstacle detectors mounted on the vehicle
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 17/931 of land vehicles
• CPC Class Codes: G01S 2013/9316 combined with communication equipment with other vehicles or with base stations
• CPC Class Codes: G01S 2013/93185 Controlling the brakes
• CPC Class Codes: G01S 2013/9322 using additional data, e.g. driver condition, road state or weather data
• CPC Class Codes: G08G 1/07 Controlling traffic signals
• CPC Class Codes: G08G 1/09623 Systems involving the acquisition of information from passive traffic signs by means mounted on the vehicle G08G1/0967 takes precedence
• CPC Class Codes: G08G 1/096783 where the origin of the information is a roadside individual element
• CPC Class Codes: G08G 1/163 involving continuous checking
• CPC Class Codes: G08G 1/166 for active traffic, e.g. moving vehicles, pedestrians, bikes

Abstract

A system and method for warning a driver of a host vehicle of a potential collision with other vehicles when turning at an intersection. The method includes determining if the host vehicle is likely to turn at the intersection, and if so, segmenting the intersection into a plurality of different regions, where each region has a different level of collision threat risk. The method obtains the speed, velocity and position of the host vehicle and any relevant remote vehicles in the intersection. The method determines a predicted path of the host vehicle and the predicted path of the remote vehicles. The method then determines whether the host vehicle and the remote vehicles will simultaneously occupy a collision zone in the intersection based on the predicted paths, and if so, issues a warning to the driver of the collision risk or apply vehicle controls to avoid or mitigate the collision risk.

Claims

1. A method for collision threat assessment when a host vehicle is turning left or right at an intersection, said method comprising:

determining if the host vehicle is likely to turn left or right at the intersection with a predetermined level of confidence;

segmenting the intersection and surrounding area into a plurality of different regions where each region has a different level of collision threat risk if the host vehicle is likely to turn left or right at the intersection;

obtaining speed, velocity and position data of the host vehicle;

obtaining speed, velocity and position data of one or more remote vehicles and/or other objects in or near the intersection;

determining a predicted path of the host vehicle based on the speed, velocity and position data as the host vehicle travels through the intersection for each of the different segmented regions;

determining a predicted path of one or more of the remote vehicles based on the speed, velocity and position data as the one or more vehicles travel through the intersection;

determining whether the host vehicle and the one or more remote vehicles will simultaneously occupy a collision zone in the intersection based on the predicted path of the host vehicle and the predicted path of the one or more remote vehicles; and

issuing a warning to a driver of the host vehicle if the host vehicle and the one or more remote vehicles will occupy the collision zone during the same time.

2. The method according to claim 1 wherein segmenting the intersection into different regions includes identifying an approach region before the intersection that the host vehicle will travel through, identifying a waiting region in the intersection that the host vehicle will travel through when making the turn, and identifying a no-waiting region in the intersection that the host vehicle will travel through when making the turn.

3. The method according to claim 1 wherein determining the predicted path of the host vehicle also includes considering geometry of the intersection that is used to refine the predicted path.

4. The method according to claim 1 wherein determining whether the host vehicle and the one or more remote vehicles will simultaneously occupy a collision zone in the intersection includes determining a duration that the host vehicle will occupy the collision zone based on the speed and the predicted path of the host vehicle, determining a duration that the one or more remote vehicles will occupy the collision zone based on the speed and predicted path of the one or more remote vehicles, and determining if the durations overlap.

5. The method according to claim 1 wherein determining whether the host vehicle and the one or more remote vehicles will simultaneously occupy a collision zone in the intersection includes determining whether the host vehicle and the one or more remote vehicles will simultaneously occupy the collision zone before the host vehicle enters the intersection.

6. The method according to claim 1 wherein determining whether the host vehicle and the one or more remote vehicles will simultaneously occupy a collision zone in the intersection includes determining whether the host vehicle and the one or more remote vehicles will simultaneously occupy the collision zone when the host vehicle is in the intersection when the one or more remote vehicles is a opposite direction traveling remote vehicle.

7. The method according to claim 1 further comprising determining that the host vehicle will not stop in the intersection when making the turn.

8. The method according to claim 7 wherein issuing a warning includes determining a time at current vehicle speed and predicted path of when the host vehicle will enter the collision zone, and issuing the warning if the time to the collision zone is below a first predetermined threshold.

9. The method according to claim 8 wherein the first threshold is determined experimentally considering driver reaction time and system delays.

10. The method according to claim 8 further comprising providing automatic braking of the host vehicle if the time to the collision zone is less than a second predetermined threshold that is shorter than the first predetermined threshold.

11. The method according to claim 10 wherein the second threshold for providing automatic braking is determined based system delays.

12. The method according to claim 8 further comprising providing information of a potential collision to the host vehicle if the time to the collision zone is greater than the first predetermined threshold, but less than a third predetermined threshold.

13. The method according to claim 1 further comprising determining that the host vehicle is coming to or has come to a stop in the intersection in anticipation of making a turn after opposing traffic has cleared, wherein issuing a warning includes determining a likely path the host vehicle will make when making the turn, calculating a closeness coefficient between the likely path of the host vehicle and the predicted path of the host vehicle, and issuing the warning if the closeness coefficient is greater than a predetermined closeness threshold, a time that the one or more remote vehicles will enter the collision zone is less than a predetermined time threshold and brakes of the host vehicle have been released.

14. The method according to claim 13 wherein determining the closeness coefficient between the predicted path and the likely path includes using the equation:

C_PL=C_X*C_Y,

where;

15. The method according to claim 1 wherein determining a predicted path of the host vehicle includes determining the predicted path of the host vehicle based on a yaw rate and/or road wheel angle of the host vehicle.

16. The method according to claim 1 wherein obtaining vehicle speed, velocity and position data of the host vehicle and the one or more remote vehicles includes using information and data from one or more of a map database, a long range radar sensor on the vehicle, a short range radar sensor on the vehicle, cameras on the vehicle, a lidar sensor on the vehicle, V2X communications, Internet communications and satellite communications.

17. The method according to claim 1 wherein determining if the host vehicle is likely to turn left or right at the intersection includes using information and data from one or more of turn signal activity, a map database, a long range radar sensor on the vehicle, a short range radar sensor on the vehicle, cameras on the vehicle, a lidar sensor on the vehicle, V2X communications, Internet communications and satellite communications.

18. The method according to claim 1 wherein segmenting the intersection and surrounding area into regions includes segmenting the intersection surrounding regions based on intersection geometry and vehicle state.

19. The method according to claim 1 further comprising determining whether the host vehicle should enter the intersection including determining whether a traffic signal is red and a distance to an intersection stop bar.

20. A method for collision threat assessment when a host vehicle is turning left or right at an intersection, said method comprising:

determining if the host vehicle is likely to turn left or right at the intersection with a predetermined level of confidence;

segmenting the intersection and surrounding area into a plurality of different regions where each region has a different level of collision threat risk if the host vehicle is likely to turn left or right at the intersection;

obtaining speed, velocity and position data of the host vehicle;

obtaining speed, velocity and position data of one or more remote vehicles and/or other objects in or near the intersection;

determining a predicted path of the host vehicle based on the speed, velocity and position data as the host vehicle travels through the intersection for each of the different segmented regions;

determining a predicted path of one or more of the remote vehicles based on the speed, velocity and position data as the one or more remote vehicles travel through the intersection;

determining a duration that the host vehicle will occupy a collision zone based on the speed and the predicted path of the host vehicle;

determining a duration that the one or more remote vehicles will occupy the collision zone based on the speed and predicted path of the one or more remote vehicles;

determining if the durations overlap;

determining that the host vehicle will not stop in the intersection when making the turn;

issuing a warning to a driver of the host vehicle if the durations overlap and if a time to enter the collision zone by the host vehicle at a current speed and predicted path of the host vehicle is less than a first predetermined threshold;

providing automatic braking of the host vehicle if the time to the collision zone is less than a second predetermined threshold that is shorter than the first predetermined threshold; and

providing information of a potential collision to the host vehicle if the time to the collision zone is greater than the first predetermined threshold, but less than a third predetermined threshold.

21. The method according to claim 20 wherein segmenting the intersection into different regions includes identifying an approach region before the intersection that the host vehicle will travel through, identifying a waiting region in the intersection that the host vehicle will travel through when making the turn, and identifying a no-waiting region in the intersection that the host vehicle will travel through when making the turn.

22. The method according to claim 20 wherein determining the predicted path of the host vehicle also includes considering geometry of the intersection that is used to refine the predicted path.

23. The method according to claim 20 wherein the first threshold is determined experimentally considering driver reaction time and system delays and the second threshold is determined based on system delays.

24. The method according to claim 20 wherein segmenting the intersection and surrounding area into regions includes segmenting the intersection surrounding regions based on intersection geometry and vehicle state.

25. A method for collision threat assessment when a host vehicle is turning left or right at an intersection, said method comprising:

determining if the host vehicle is likely to turn left or right at the intersection with a predetermined level of confidence;

segmenting the intersection and surrounding area into a plurality of different regions where each region has a different level of collision threat risk if the host vehicle is likely to turn left or right at the intersection;

obtaining speed, velocity and position data of the host vehicle;

obtaining speed, velocity and position data of one or more remote vehicles and/or other objects in or near the intersection;

determining a predicted path of the host vehicle based on the speed, velocity and position data as the host vehicle travels through the intersection for each of the different segmented regions;

determining a predicted path of one or more of the remote vehicles based on the speed, velocity and position data as the one or more remote vehicles travel through the intersection;

determining a duration that the host vehicle will occupy a collision zone based on the speed and the predicted path of the host vehicle;

determining a duration that the one or more remote vehicles will occupy the collision zone based on the speed and predicted path of the one or more remote vehicles;

determining if the durations overlap;

determining that the host vehicle is coming to or has come to a stop in the intersection in anticipation of making a turn after opposing traffic has cleared;

determining a likely path the host vehicle will take when making the turn;

calculating a closeness coefficient between the likely path of the host vehicle and the predicted path of the host vehicle;

issuing a warning if the closeness coefficient is greater than the predetermined closeness threshold, the time that the one or more remote vehicles will enter the collision zone is less than a predetermined time threshold, and brakes of the host vehicle have been released;

providing automatic braking of the host vehicle if the time to the collision zone is less than a second predetermined threshold that is shorter than the first predetermined threshold; and

providing information of a potential collision to the host vehicle if the time to the collision zone is greater than the first predetermined threshold, but less than a third predetermined threshold

26. The method according to claim 25 wherein determining the closeness coefficient between the predicted path and the likely path includes using the equation:

C_PL=C_X*C_Y,

where;

27. The method according to claim 25 wherein segmenting the intersection into different regions includes identifying an approach region before the intersection that the host vehicle will travel through, identifying a waiting region in the intersection that the host vehicle will travel through when making the turn, and identifying a no-waiting region in the intersection that the host vehicle will travel through when making the turn.

28. The method according to claim 25 wherein determining the predicted path of the host vehicle also includes considering geometry of the intersection that is used to refine the predicted path.

29. The method according to claim 25 wherein the first threshold is determined experimentally considering driver reaction time and system delays and the second threshold is determined based on system delays.

30. The method according to claim 25 wherein segmenting the intersection and surrounding area into regions includes segmenting the intersection surrounding regions based on intersection geometry and vehicle state.