Intelligent air bag system

• US 6,889,215 B2
• Filed: 05/16/2001
• Issued: 05/03/2005
• Est. Priority Date: 10/27/1999
• Status: Expired due to Fees

• Current Assignee: IMS Incorporated (Wesco International Incorporated)
• Original Assignee: Intelligent Mechatronic Systems Inc. (Trak Global Group Ltd.)
• Inventors: Basir, Otman, Karray, Fakhri
• Primary Examiner(s): Knight, Anthony
• Assistant Examiner(s): Hirl, Joseph P.
• Application Number:
  US09/858,676
• Publication Number:
  US 20010047344A1
• Time in Patent Office: 1,448 Days
• Field of Search: 706/52, 706/12, 706/14
• US Class Current: 706/14
• CPC Class Codes: B60R 2021/01068 between different sensors and airbag control unit
• CPC Class Codes: B60R 2021/01293 programmable for use in different vehicles or with different airbags configurations
• CPC Class Codes: B60R 21/01516 using force or pressure sensing means
• CPC Class Codes: B60R 21/0153 using field detection presence sensors
• CPC Class Codes: B60R 21/01544 detecting seat belt parameters, e.g. length, tension or height-adjustment
• CPC Class Codes: B60R 21/01546 using belt buckle sensors
• CPC Class Codes: B60R 21/01556 Child-seat detection systems

Abstract

An intelligent air bag system includes a controller communicating with a sensor suite and the air bag. The controller preferably includes a fuzzy inference engine. The sensor suite includes a plurality of sensors such as weight sensors, acceleration sensors, seat belt activation sensors, and the like. The fuzzy inference engine determines deployment by using a rule base including a multiple of parameters. The decision to deploy the air bag and the strength of the air bag deployment is determined by controller using fuzzy logic to more particularly tailor deployment to present conditions.

Claims

1. An occupant safety system comprising:

a controller including a fuzzy inference engine responding to a rule base;

a sensor suite communicating with said controller; and

said controller operable to activate an active restraint at one of a plurality of levels of deployment based upon said sensor suite and said rule base.

2. The system as recited in claim 1, wherein said sensor suite includes a weight sensor.

3. The system as recited in claim 1, wherein said sensor suite includes a seat belt activation sensor.

4. The system as recited in claim 1, further comprising a database in communication with said controller.

5. The system of claim 1 wherein the controller chooses among a zero deployment and a plurality of active levels of deployment for an active restraint, wherein the deployment instructions indicate the zero deployment or one of the active levels of deployment.

6. The system of claim 1 wherein the controller includes a fuzzy engine output including a zero deployment membership function and a plurality of deployment membership functions.

7. The system of claim 6 wherein the controller scales the fuzzy engine output based upon occupant information.

8. The system of claim 7 wherein the occupant information includes at least one of seat belt usage or occupant height.

9. A method of activating an active restraint comprising the steps of:

(1) defining a rule base relating a multiple of active restraint deployment parameters and conditions;

(2) communicating inputs from a sensor suite to a controller operating upon the rule base; and

(3) determining a level of force with which to deploy the active restraint in response to the rule base and said inputs.

10. A method as recited in claim 9, wherein said step (3) is based in part upon whether a seat belt is fastened.

11. A method as recited in claim 9, wherein said step (3) is based in part upon vehicle type.

12. A method as recited in claim 9, wherein said step (3) is based in part upon passenger weight.

13. A method as recited in claim 9, wherein said step (3) is based in part upon classifying a severity of collision.

14. The method of claim 9 wherein said step (3) further includes the steps of:

(4) determining whether to deploy the active restraint in response to the rule base and the inputs; and

(5) determining the level of force with which to deploy the active restraint in response to the rule base and said inputs only if it is determined in said step (4) to deploy the active restraint.

15. The method of claim 9 wherein said step 3) further includes the step of choosing among a zero deployment and a plurality of levels of deployment far the active restraint, wherein the deployment instructions indicate the zero deployment or one of the levels of deployment.

16. The method of claim 9 wherein said step 3) further includes the step of using a fuzzy engine output including a zero deployment membership function and a plurality of deployment membership functions.

17. The method of claim 16 further including the step of scaling the fuzzy engine output based upon occupant information.

18. The method of claim 17 wherein the occupant information includes at least one of seat belt usage or occupant height.

19. A computer readable medium scoring a program which when executed by a computer performs the steps of:

1) converting occupant and crash information inputs into fuzzy data;

2) using the fuzzy data in a fuzzy logic controller to determine fuzzy controI actions;

3) converting the fuzzy control actions into deployment instructions, by defuzzifying the control actions; and

4) sending the deployment instructions to an active restraint deployment controller.

20. The computer readable medium as recited in claim 19, wherein said fuzzy logic controller utilizes a rule base and inference engine to determine the control actions.

21. The computer readable medium an recited in claim 19, wherein said step 3) further comprises determining the strength of active restraint deployment.

22. The computer readable medium as recited in claim 19, wherein said step 3) further comprises using occupant height and seatbelt information to determine deployment instructions.

23. The computer readable medium of claim 19 wherein said step 3) further includes the step of choosing among a zero deployment and a plurality of levels of deployment For an active restraint, wherein the deployment instructions indicate the zero deployment or one of the levels of deployment.

24. The computer readable medium of claim 19 wherein the fuzzy logic controller includes a fuzzy engine output including a zero deployment membership function and a plurality of deployment membership functions.

25. The computer readable medium of claim 24 wherein the computer further performs the step of scaling the fuzzy engine output based upon occupant information.

26. The computer readable medium of claim 25 wherein the occupant information includes at least one of seat belt usage or occupant height.