Distributed vehicle safety system having fault protection

• US 6,448,671 B1
• Filed: 08/05/1999
• Issued: 09/10/2002
• Est. Priority Date: 08/05/1999
• Status: Expired due to Term

• Current Assignee: TRW Limited (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: TRW Limited (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Wallace, Jon K., Lynch, Russell J.
• Primary Examiner(s): FLEMING, FRITZ M
• Application Number:
  US09/369,138
• Time in Patent Office: 1,132 Days
• Field of Search: 307/10.1, 701/36-49, 701/62, 701/76, 701/92, 701/97, 701/107, 370/221-224
• US Class Current: 307/10.1
• CPC Class Codes: B60R 2021/01075 between the airbag control unit and pyrotechnic fuses or equivalent actuators
• CPC Class Codes: B60R 2021/01102 Transmission method
• CPC Class Codes: B60R 2021/01184 Fault detection or diagnostic circuits in power circuits B60R2021/01129
• CPC Class Codes: B60R 21/01 Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents electrical circuits for transmission of signals between steering wheel and the vehicle itself B60R16/027; for electrically actuating belt retractor locking means B60R22/343

Abstract

A distributed vehicle safety system (10) includes a plurality of devices (16), each of which performs a function associated with safety at a vehicle (12). A bus (18) conveys communication regarding the devices (16). An isolation device (28) is associated with each device (16) and electronically isolates one of the devices from the bus (18) upon occurrence of a fault condition. Preferably, the system (10) includes a plurality of control circuitries (26), each for controlling a respective one of the devices (16), and the control circuitry is isolated with the associated device (i.e., each control circuitry/device arrangement is isolated). In one embodiment, a plurality of bus connector/bus plug mated pairs (20 and 22) connects the plurality of control circuitry/device arrangements (26 and 16) to the bus (18). Each connector/bus plug pair (20 and 22) includes a switch (e.g., 60) for enabling communication between a respective control circuitry/device arrangement (26 and 16) and the bus (18), and for disabling communication between the respective control/device arrangement and the bus in response to a fault condition.

Claims

1. A distributed vehicle safety system comprising:

a plurality of control/device arrangements for accomplishing a function associated with safety at a vehicle;

bus means for conveying communication to said control/device arrangements; and

a plurality of bus connector means for connecting said plurality of control/device arrangements to said bus means, each bus connector means including switch means for enabling communication between a respective control/device arrangement and said bus means and for disabling communication between said respective control/device arrangement and said bus means in response to a fault condition at a component associated with said respective control/device arrangement; and

a plurality of electronic switches, interposed along a line of said bus connector means, each associated with a respective one of said control/device arrangements and for enabling or disabling passage of communication on said bus means beyond the respective electronic switch in response to a fault condition at a component associated with a control/device arrangement located beyond the respective electronic switch.

2. A system as set forth in claim 1, each bus connector means includes means for determining the occurrence of a fault condition at said control/device arrangement, said switch means disabling communication being responsive to the determination of said means for determining.

3. A system as set forth in claim 1, wherein said switch means for enabling communication between said respective control/device arrangement and said bus means includes an electronic switch interposed along a line extending from said bus means.

4. A system as set forth in claim 1, wherein said switch means for enabling communication between said respective control/device arrangement and said bus means includes a first electronic switch interposed along a first line extending from said bus means, and a second electronic switch extending along a second line extending from said bus means.

5. A system as set forth in claim 1, wherein said bus means also conveys power for use by said devices.

6. A system as set forth in claim 1, wherein said system is a vehicle occupant protection system, and one of said plurality of control/device arrangements including an actuatable occupant protection device.

7. A distributed vehicle safety system comprising:

a plurality of devices, each for performing a function associated with safety at a vehicle;

bus means for conveying communication regarding said devices;

means, associated with a first one of said devices, for determining the occurrence of a fault condition at a component associated with said first device;

means, associated with said first device, for electronically isolating said first device from said bus means upon determination of the fault condition at the component associated with said first device;

means, associated with said first device, for determining the occurrence of a fault condition at a component associated with another of said devices; and

means, associated with said first device, for electronically isolating said another device from said bus means upon determination of the fault condition at the component associated said another device.

8. A system as set forth in claim 7, wherein said means for isolating said first device includes an electronic switch interposed along a line extending from said bus means.

9. A system as set forth in claim 7, wherein said means for isolating said first device includes a first electronic switch interposed along a first line extending from said bus means, and a second electronic switch interposed along a second line extending from said bus means.

10. A system as set forth in claim 7, including a plurality of connector means for connecting said plurality of devices to said bus means, each of said connector means including a connection line extending to a respective one of said devices, said means for determining the occurrence of a fault condition at a component associated with said first device includes means for monitoring the associated one of said connection lines.

11. A system as set forth in claim 7, wherein said means for isolating said another device includes an electronic switch interposed along a line of said bus means.

12. A system as set forth in claim 7, wherein said means for isolating said another device being also for isolating a group of said devices from said bus means.

13. A system as set forth in claim 12, including a plurality of control means, each for controlling at least an associated one of said devices, one of said control means controlling more than one of said devices, wherein said means for isolating a group of said devices includes means for isolating said devices controlled by said one of said control means.

14. A system as set forth in claim 7, wherein said bus means also conveys power for use by said devices.

15. A system as set forth in claim 7, including control means, associated with said one device, for receiving communication regarding said one device from said bus means and for controlling said one device, said means for isolating said first device also for electronically isolating said control means from said bus.

16. A system as set forth in claim 15, including a connection line extending between said control means and said one device, and said means for determining the occurrence of a fault condition at a component associated with said first device includes means for determining the occurrence of a fault condition at said connection line, said means for isolating said first device and said control means being responsive to the determination of said means for determining the occurrence of the fault condition at said connection line.

17. A system as set forth in claim 7, including a connection line extending to said one device, and said means for determining the occurrence of a fault condition at a component associated with said first device includes means for determining the occurrence of a fault condition at said connection line, said means for isolating said first device being responsive to the determination of said means for determining the occurrence of the fault condition at said connection line.

18. A system as set forth in claim 17, wherein said means for determining the occurrence of the fault condition at said connection line includes means for determining whether a short is present at said connection line.

19. A system as set forth in claim 7, wherein said system is a vehicle occupant protection system, said plurality of devices including an actuatable occupant protection device.

20. A distributed vehicle safety system comprising:

a plurality of devices, each for performing a function associated with safety at a vehicle;

a plurality of control means, each for controlling a respective one of said devices;

bus means for conveying communication regarding said devices to said control means;

means, associated with a first one of said control means, for determining the occurrence of a fault condition at a component associated with said first control means;

means, associated with said first control means, for electronically isolating said first control means from said bus means upon determination of the fault condition at the component associated with said first control means;

means, associated with said first control means, for determining the occurrence of a fault condition at a component associated with another of said control means; and

means, associated with said first control means, for electronically isolating said another control means from said bus means upon determination of the fault condition at the component associated said another control means.

21. A system as set forth in claim 20, including a spacing connection between said first of said control means and said respective device to space said respective device as way from said first control means.

22. A system as set forth in claim 20, wherein said component associated with said first control means is a connection between said a first control means and said respective device that includes a line, said means for determining a fault condition at a component associated with said first control means including means for determining a short condition at the line as the fault condition.

23. A system as set forth in claim 20, wherein said means for isolating said first control means includes an electronic switch interposed along a line extending from said bus means.

24. A system as set forth in claim 20, wherein said means for isolating said first control means includes a first electronic switch interposed along a first line extending from said bus means, and a second electronic switch interposed along a second line extending from said bus means.

25. A system as set forth in claim 20, wherein said means for isolating said another control means includes an electronic switch interposed along a line of said bus means.

26. A system as set forth in claim 20, wherein said means for isolating said another control means including means for isolating a group of said control means from said bus means upon occurrence of the fault condition at a component associated with said another of said control means.

27. A system as set forth in claim 20, wherein said bus means also conveys power for use by said devices.

28. A system as set forth in claim 20, wherein said system is a vehicle occupant protection system, said plurality of devices including an actuatable occupant protection device.