Collision mitigation by braking system

• US 6,607,255 B2
• Filed: 01/17/2002
• Issued: 08/19/2003
• Est. Priority Date: 01/17/2002
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Tellis, Levasseur, Ekmark, Jonas, Tarabishy, M. Nabeel, Engelman, Gerald H, Bond, John Vincent III, Jansson, Jonas L. Z.
• Primary Examiner(s): Schwartz, Christopher P.
• Application Number:
  US10/050,987
• Publication Number:
  US 20030132666A1
• Time in Patent Office: 579 Days
• Field of Search: 303/191, 303/193, 701/301, 701/96
• US Class Current: 303/193
• 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

Abstract

A brake control system (10) for an automotive vehicle (12) is provided. The system (10) includes a vehicle sensor complex (16) that generates a vehicle sensor complex signal and an object detection system (14) that generates an object detection signal. A brake controller (22) is electrically coupled to the vehicle sensor complex and the object detection system. The controller (22) in response to the vehicle sensor complex signal and the object detection signal generates a brake ramping control signal. Controller (22) adjusts brake pressure in response to the brake ramping control signal. A method for performing the same is also provided.

Claims

1. A brake control system for an automotive vehicle comprising:

a vehicle sensor complex generating a vehicle sensor complex signal;

an object detection system generating an object detection signal;

a brake controller electrically coupled to said vehicle sensor complex and said object detection system, said brake controller generating a brake ramping control signal in response to said vehicle sensor complex signal and said object detection signal, said brake controller adjusting brake pressure in response to said brake ramping control signal.

2. A system as in claim 1 further comprising:

an accelerator having a plurality of positions; and

an accelerator position sensor electrically coupled to said accelerator and said brake controller and generating an accelerator position signal;

said brake controller releasing brake pressure in response to said accelerator position signal.

3. A system as in claim 2 wherein said brake controller releases brake pressure when said accelerator is approximately in a full throttle position.

4. A system as in claim 1 further comprising:

a threat indicator electrically coupled to said brake controller having a positive indication and a negative indication;

said brake controller generating a collision assessment signal in response to said vehicle sensor complex signal and said object detection signal;

said brake controller signaling said threat indicator to be positive when said collision assessment signal is greater than a predetermined value and negative when said collision assessment signal is less than or equal to the predetermined value.

5. A system as in claim 4 further comprising a warning indicator electrically coupled to said brake controller and indicating a collision warning signal in response to said collision assessment signal.

6. A system as in claim 4 wherein said threat indicator is reset by at least one of the following:

a manual reset button, a throttle position, and a collision assessment signal.

7. A system as in claim 6 wherein said brake controller determines a detected object to be a false object when said threat indicator is reset.

8. A system as in claim 4 wherein said brake controller releases brake pressure when said threat indicator is negative.

9. A system as in claim 4 further comprising an engine torque controller reducing the amount of engine torque in the vehicle in response to said collision assessment signal.

10. A method of controlling a braking system for an automotive vehicle comprising:

generating a vehicle sensor complex signal;

generating an object detection signal;

generating a brake ramping control signal in response to said vehicle sensor complex signal and said object detection signal; and

adjusting brake pressure in response to said brake ramping control signal.

11. A method as in claim 10 further comprising:

generating a vehicle status signal and an object status signal in response to said vehicle sensor complex signal and said object detection signal;

generating a collision assessment signal in response to said vehicle status signal and said object status signal; and

adjusting brake pressure in response to said collision assessment signal.

12. A method as in claim 11 further comprising indicating a collision warning signal in response to said collision assessment signal.

13. A method as in claim 11 further comprising reducing engine torque of the vehicle in response to said collision assessment signal.

14. A method as in claim 10 wherein adjusting brake pressure comprises ramping the brake pressure.

15. A method as in claim 10 further comprising releasing brake pressure when a threat indicator is reset or an accelerator is in approximately a full throttle position.

16. A method as in claim 10 wherein generating a brake ramping control signal comprises:

determining object velocity relative to the vehicle and generating a relative velocity signal;

determining distance between said object and the vehicle and generating a relative distance signal; and

generating said brake ramping control signal in response to said relative velocity signal and said relative distance signal.

17. A method as in claim 10 wherein generating a brake ramping control signal comprises:

determining an object classification and generating an object classification signal; and

generating said brake ramping control signal in response to said object classification signal.

18. A method as in claim 10 wherein generating a brake ramping control signal further comprise limiting the amount of applied brake pressure.

19. A brake control system for an automotive vehicle having a braking system comprising:

a vehicle sensor complex generating a vehicle sensor complex signal;

an object detection system generating an object detection signal;

a collision controller electrically coupled to said vehicle sensor complex and said object detection system and generating a vehicle status signal and an object status signal in response to said vehicle sensor complex signal and said object detection signal;

said collision controller generating a collision assessment signal in response to said vehicle status signal and said object status signal; and

a brake controller electrically coupled to said collision controller comprising;

a brake ramping correlator generating a brake ramping control signal in response to said vehicle status signal and said object status signal;

said brake controller adjusting brake pressure in response to said brake ramping control signal.

20. A system as in claim 19 wherein said braking system further comprising:

a brake pedal having various positions corresponding to various brake pressure levels;

said brake controller when adjusting brake pressure allowing increased brake pressure when said brake pedal position corresponds to a brake pressure level that is greater than an autonomous brake pressure level.

21. A system as in claim 19 further comprising:

a threat indicator electrically coupled to said collision controller having a positive indication and a negative indication;

said collision controller signaling said threat indicator to be positive when said collision assessment signal is greater than a predetermined value and negative when said collision assessment signal is less than or equal to the predetermined value.