METHOD AND APPARATUS FOR VEHICLE BRAKE LIGHT CONTROL

• US 20080238648A1
• Filed: 03/19/2008
• Published: 10/02/2008
• Est. Priority Date: 03/27/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Tewari, Asim
• Granted Patent: US 7,834,751 B2
• Time in Patent Office: Days
• US Class Current: 340/469
• CPC Class Codes: B60Q 1/444 with indication of the braking strength or speed changes, e.g. by changing shape or intensity of the indication B60Q1/1407, B60Q1/442, B60Q1/447 take precedence

Abstract

A method for controlling the brake lights of a vehicle includes determining vehicle deceleration potential and modulating brake light activation based upon the vehicle deceleration potential, the modulating comprising changing at least one of brake light intensity and flashing of the brake lights.

Claims

1. Method for controlling the brake lights of a vehicle, comprising:

determining vehicle deceleration potential; and

,

modulating brake light activation based upon said determining, said modulating comprising changing at least one of brake light intensity and flashing of said brake lights.

2. The method of claim 1, wherein said determining vehicle deceleration potential comprises monitoring indicators comprising at least one of brake pedal position, change in brake pedal depression, vehicle rate of deceleration, vehicle velocity, and data from a vehicle stability system.

3. The method of claim 1, wherein said determining vehicle deceleration potential comprises monitoring indicators comprising at least two of brake pedal position, change in brake pedal depression, vehicle rate of deceleration, vehicle velocity, and data from a vehicle stability system and calculating said vehicle deceleration potential based upon said monitoring.

4. The method of claim 3, wherein said calculating said vehicle deceleration potential comprises:

estimating a braking urgency factor for each of said indicators;

estimating an overall braking urgency factor based on said indicators; and

tracking the greater of said braking urgency factors and said overall braking urgency factor.

5. The method of claim 1, wherein said flashing of said brakes lights comprises oscillating between said brake lights illuminated to a full intensity and said brake lights controlled to a partial intensity.

6. The method of claim 1, wherein said flashing of said brakes lights comprises repeating a pattern of changing light intensity.

7. The method of claim 1, wherein said modulating brake light activation comprises said changing of said flashing of said brake lights based upon a vehicle rate of deceleration, wherein changing of said flashing of said brake lights comprises utilizing a maximum flashing frequency when said vehicle rate of deceleration is greater than a high level deceleration limit.

8. The method of claim 7, wherein said changing of said flashing of said brake lights further comprises utilizing a variable flashing frequency when said vehicle rate of deceleration is less than said high level deceleration limit, wherein said variable flashing frequency coincides with said maximum flashing frequency when said rate of deceleration equals said high level deceleration limit and decreases as said vehicle rate of deceleration decreases.

9. The method of claim 8, wherein said utilizing said variable flashing frequency modulates a period of time said flashing requires to complete a flashing cycle.

10. The method of claim 8, wherein said utilizing said variable flashing frequency modulates a duty cycle of brake light activation within a fixed duration flashing cycle.

11. The method of claim 7, wherein said utilizing said maximum flashing frequency comprises fixing said modulating brake light activation to said maximum flashing frequency until an end to a slowing event occurs.

12. The method of claim 11, wherein said utilizing said maximum flashing frequency further comprises fixing said modulation brake light activation to said maximum flashing frequency until a normalizing gas pedal event occurs.

13. The method of claim 1, wherein said modulating brake light activation comprises said changing of brake light intensity based upon vehicle velocity, wherein said changing brake light intensity comprises utilizing increased brake light intensity for higher vehicle velocities.

14. The method of claim 13, wherein said changing of brake light intensity further comprises:

utilizing a minimum brake light intensity when said vehicle velocity is below a low level velocity limit; and

utilizing a maximum brake light intensity when said vehicle velocity exceeds a high level velocity limit.

15. The method of claim 14, wherein said changing brake light intensity further comprises:

utilizing an increasing-with-velocity brake light intensity when said vehicle velocity is between said low level velocity limit and said high level velocity limit.

16. The method of claim 1, wherein said modulating brake light activation comprises:

said changing of said flashing of said brake lights based upon a rate of deceleration, wherein said changing of said flashing of said brake lights comprises utilizing a maximum flashing frequency when said rate of deceleration exceeds a high level deceleration limit; and

said changing of brake light intensity based upon vehicle velocity, wherein said changing of brake light intensity comprises utilizing increased brake light intensity for higher vehicle velocities.

17. Method for rear end collision avoidance by modulation of brake light activation, comprising:

monitoring vehicle rate of deceleration;

monitoring vehicle velocity;

modulating brake light activation by changing brake light intensity based upon vehicle velocity, wherein said changing brake light intensity comprises utilizing increased brake light intensity as said vehicle velocity increases; and

modulating brake light activation by flashing of brake lights based upon said vehicle rate of deceleration, wherein said flashing of said brake lights comprises utilizing a maximum flashing frequency when said rate of deceleration is greater than a high level deceleration limit.

18. The method of claim 17, wherein said flashing of said brake lights further comprises utilizing a variable flashing frequency when said vehicle rate of deceleration is less than said high level deceleration limit, wherein said variable flashing frequency decreases as said vehicle rate of deceleration decreases.

19. Apparatus for controlling brake light activation, comprising:

brake lights mounted on a vehicle; and

a brake light controller monitoring a vehicle velocity and a vehicle rate of deceleration and controlling activation of said brake lights based upon said vehicle velocity and said vehicle deceleration;

wherein said activation comprises flashing said brake lights based upon said vehicle deceleration and changing brake light intensity based upon said vehicle velocity.

20. The apparatus of claim 19, wherein said activation further comprises:

increasing a rate of flashing said brake lights as said vehicle rate of deceleration increases;

when said vehicle velocity is less than a low level velocity limit, utilizing a minimum brake light intensity;

when said vehicle velocity exceeds a high level velocity limit, utilizing a maximum brake light intensity; and

when said vehicle velocity is between said low level velocity limit and said high level velocity limit, utilizing an increasing-with-velocity brake light intensity.