Method and apparatus for rear-end collision warning and accident mitigation

• US 20070152803A1
• Filed: 12/28/2005
• Published: 07/05/2007
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Palo Alto Research Center, Inc. (Xerox Holdings Corp.)
• Inventors: Reich, James, Cheung, Patrick C.P., Larner, Dan, Huang, Quinfeng
• Granted Patent: US 7,495,550 B2
• Time in Patent Office: Days
• US Class Current: 340/435
• CPC Class Codes: B60Q 1/535 to prevent rear-end collisions, e.g. by indicating safety distance at the rear of the vehicle
• CPC Class Codes: B60Q 9/008 for anti-collision purposes
• CPC Class Codes: B60R 21/0134 responsive to imminent contact with an obstacle , e.g. using radar systems

Abstract

This disclosure introduces a system which generates a visual, audio, and/or tactile warning to a driver of a lead vehicle when a possible rear-end collision is detected, based on the approach of a second vehicle from a rear direction. The system may also generate a warning signal (such as quick blinking red brake light, or an array of multi-color lights) directed to the approaching vehicle when it is determined to be approaching at an unsafe speed. The system may include one or more of: approaching-vehicle-sensors mounted on the back end of the lead vehicle, a computer processing system, a set of warning lights, a set of speakers within the lead vehicle, and an antenna and transmitter/receiver for communicating with systems of other vehicles. This system may include a connection to the existing taillight system and other existing systems in the lead vehicle. Extended systems may include connections to and control of head support system, seat-belt systems and airbags system to provide additional safety to the occupants of the lead vehicle. The system may also record and store a few seconds of sensor data of the pre-crash and crash related scene when an impact occurs, and provide blind spot warnings.

Claims

1. A method for generating a rear-end collision warning within a lead vehicle having at least one sensor, a computer processing system and an alerting device, the method comprising:

detecting, using at least one sensor, a second vehicle approaching the lead vehicle from a rear direction;

calculating, using the central processing system, a time to collision, based on at least one algorithm that determines a relative velocity of the second vehicle using data from the sensor; and

generating, using the alerting device, a rear-end collision warning to alert a driver of the lead vehicle of a possible rear-end collision, when the time to collision is within a predetermined range of values.

2. The method of claim 1, said calculating further comprising:

calculating an estimated severity of the collision based on the at least one algorithm.

3. The method of claim 1, said generating further comprising:

generating at least one of;

a visual alert, an audio alert, and a tactile alert.

4. The method of claim 3, wherein the visual alert comprises flashing at least one light within a visible field of the driver.

5. The method of claim 4, wherein the visual alert comprises flashing at least one light within a visible field of the driver at a variable rate based on the time to collision.

6. The method of claim 3, wherein the visual alert comprises displaying, to the driver, at least one of:

a distance of the second vehicle, the time to collision with the second vehicle and an estimated severity of the collision.

7. The method of claim 3, wherein the audio alert comprises transmitting a sound through a speaker that is audible to the driver.

8. The method of claim 3, wherein the tactile alert comprises generating a sensation that can be felt by the driver.

9. The method of claim 1, said detecting further comprising;

detecting the second vehicle using at least one camera.

10. The method of claim 1, said detecting further comprising detecting the second vehicle using at least one of:

a radar and a lidar.

11. The method of claim 1, further comprising:

activating a safety apparatus of the lead vehicle based on the time to collision.

12. The method of claim 1, further comprising:

generating a visual alert to a driver of the second vehicle.

13. The method of claim 12, said generating the visual alert to the driver of the second vehicle further comprising:

flashing a brake light of the lead vehicle at a rate that changes based on the time to collision.

14. The method of claim 12, said generating the visual alert to the driver of the second vehicle further comprising:

flashing an array of multi-color lights mounted on the lead vehicle facing the rear direction at a rate that is based on at least one of;

the time to collision and an estimated severity of the collision.

15. The method of claim 14, further comprising:

receiving a selection of a pattern for the array of multi-color lights; and

flashing the array of multi-color lights according to the pattern.

16. The method of claim 1, further comprising:

transmitting, to the second vehicle, a signal indicating a possible collision based on the time to collision, whereby the second vehicle uses the signal to activate at least one of;

a driver alerting device of the second vehicle, a braking system of the second vehicle, and a safety device of the second vehicle.

17. The method of claim 1, further comprising:

generating a noise that is audible to a driver of the second vehicle based on the time to collision.

18. The method of claim 1, further comprising:

receiving, from the second vehicle using the at least one sensor, vehicle performance data of the second vehicle, wherein said at least one algorithm determines the time to collision using the vehicle performance data.

19. The method of claim 18, further comprising:

flashing an array of multi-color lights mounted on the lead vehicle facing the rear direction; and

adjusting an angle of the array of multi-color lights based on the vehicle performance data and a distance of the second vehicle determined using data from the at least one sensor.

20. The method of claim 1, further comprising:

receiving sensor data from the at least one sensor, the sensor data comprising at least one of;

temperature of the road surface, road surface conditions, precipitation conditions; and

said calculating further comprising;

calculating, based on the sensor data, at least one of the time to collision and an estimated severity of the collision.

21. The method of claim 1, further comprising:

permanently storing sensor data regarding the second vehicle approaching the lead vehicle for retrieval after a collision of the second vehicle and the lead vehicle.

22. A method for generating a rear-end collision warning within a lead vehicle having at least one sensor, a computer processing system and at least one alerting device, the method comprising:

detecting, using the at least one sensor, a second vehicle approaching the lead vehicle from a rear direction;

calculating, using the central processing system, at least one of a time to collision and an estimated severity of collision, based on at least one algorithm that determines a relative velocity of the second vehicle using data from the sensor; and

generating, using a first alerting device, a rear-end collision warning to alert a driver of the lead vehicle of a possible rear-end collision, when the time to collision is within a predetermined range of values; and

generating, using a second alerting device, a second rear-end collision warning to alert a driver of the second vehicle of the possible rear-end collision, when the time to collision is within a second predetermined range of values.

23. The method of claim 22, wherein the first predetermined range of values equals the second predetermined range of values.

24. The method of claim 22, said generating the second rear-end collision warning further comprising:

flashing at least one of a brake light, a reverse light, and an array of rear-facing lights of the lead vehicle.

25. The method of claim 24, said flashing further comprising:

flashing at least one of the brake light, the reverse light, and the array of rear-facing lights at a variable rate that is based on the time to collision.

26. The method of claim 25, wherein the variable rate may be adjusted manually.

27. A method for generating a rear-end collision warning within a lead vehicle having at least one sensor, an antenna, a computer processing system and at least one alerting device, the method comprising:

detecting, using the at least one sensor, a second vehicle approaching the lead vehicle from a rear direction;

receiving, using the antenna, vehicle performance information from the second vehicle;

calculating, using the central processing system, a time to collision, based on the vehicle performance information and at least one algorithm that determines the velocity of the second vehicle using data from the sensor; and

generating, using a first alerting device, a rear-end collision warning to alert a driver of the lead vehicle of a possible rear-end collision, when the time to collision is within a range of values determined from the vehicle performance information.

28. The method of claim 27, further comprising:

receiving, from the second vehicle using the at least one sensor, vehicle performance data of the second vehicle, wherein said at least one algorithm determines the time to collision based on the vehicle performance data.