Magnetic sensor

• US 7,212,895 B2
• Filed: 12/21/2004
• Issued: 05/01/2007
• Est. Priority Date: 12/21/2003
• Status: Active Grant

• Current Assignee: Joyson Safety Systems Acquisition, LLC
• Original Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Cech, Leonard S., Watson, W. Todd
• Primary Examiner(s): Camby; Richard M.
• Application Number:
  US10/905,219
• Publication Number:
  US 20050143944A1
• Time in Patent Office: 861 Days
• Field of Search: 701/45, 701/46, 701/47, 701/48, 701/1, 701/36, 340/522, 324/500, 324/522
• US Class Current: 701/45
• CPC Class Codes: B60R 2021/0006 Lateral collision
• CPC Class Codes: B60R 21/0134 responsive to imminent contact with an obstacle , e.g. using radar systems

Abstract

A magnetic flux is sensed within a gap at a first location between two portions of a vehicle body/structure and a signal generated responsive thereto controls an element of the vehicle, wherein the magnetic flux is responsive to a disturbance of the vehicle body/structure. In one embodiment, the first location is proximate to the A-pillar, B-pillar or C-pillar. In another embodiment, at least a portion of the magnetic flux is generated by a coil at a different second location. A gap coil is located within a gap between portions of the vehicle body/structure for generating or sensing magnetic flux. A plurality of gap coils of various orientations provide for multi-axis sensitivity. In another aspect, a magnetic crash sensing system comprises a first coil at a first location, and a plurality of magnetic sensors at a plurality of corresponding second locations.

Claims

1. A method of providing for sensing a magnetic perturbation of a vehicle, comprising:

providing for sensing a magnetic flux within a gap at at least one first location between two portions of a body or structure of the vehicle, wherein said magnetic flux is responsive to a disturbance of said body or structure of said vehicle;

providing for generating at least one signal responsive to the operation of sensing said magnetic flux; and

providing for controlling an element of the vehicle responsive to said signal.

2. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 1, wherein the operations of sensing said magnetic flux and generating said at least one signal responsive thereto comprise placing at least one first coil within said gap so as to receive said magnetic flux, and generating said signal with said at least one first coil responsive to a change in said magnetic flux.

3. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein at least one axis of a corresponding said at least one first coil is oriented substantially perpendicular to a surface bounding said gap.

4. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein at least one axis of a corresponding said at least one first coil is oriented substantially parallel to a surface bounding said gap.

5. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein at least one axis of a corresponding said at least one first coil is oriented substantially oblique to a surface bounding said gap.

6. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein said at least one first coil comprises a plurality of first coils, and at least two axes of at least two corresponding said first coils are oriented in different directions.

7. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein said at least one first coil comprises a ferromagnetic core.

8. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein said at least one first coil is bonded to a surface bounding said gap.

9. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein said at least one first coil is operatively coupled to said body or structure of said vehicle with a fastener through a central portion of said at least one first coil.

10. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein said at least one first coil is located between an outward facing surface of said body or structure of said vehicle and an inward facing surface of a proximate door of said vehicle.

11. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein at least one said first coil comprises a toroidal helical coil.

12. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 2, wherein the operation generating said at least one signal comprises generating a signal responsive to a self-inductance of said at least one first coil.

13. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 1, wherein said element of said vehicle comprises a safety restraint system, and the operation of controlling said element comprises controlling the actuation of said safety restraint system responsive to a detection of a crash involving said vehicle body, where said detection is responsive to said at least one signal.

14. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 1, wherein said element of said vehicle comprises an element responsive to a door opening condition, and the operation of controlling said element comprises detecting from said at least one signal a door opening state, and controlling said element responsive to said door opening state.

15. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 1, further comprising providing for generating at least a portion of said magnetic flux within said vehicle body, wherein the operation of generating at least a portion of said magnetic flux is at a second location with a second coil operatively associated with said body or structure of said vehicle, wherein said second location is distinct from said at least one first location, and the operation of generating at least a portion of said magnetic flux comprises applying a current to said second coil.

16. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 15, wherein said second location is selected from one of a location proximate to a B-pillar of said vehicle, a location proximate to an A-pillar of said vehicle, and a location proximate to a C-pillar of said vehicle, and said at least one first location is selected from another of a location proximate to an A-pillar of said vehicle, a location proximate to a C-pillar of said vehicle, and a location proximate to a B-pillar of said vehicle.

17. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 15, wherein said second coil is placed within a gap between two portions of said body or structure of said vehicle proximate to said second location.

18. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 15, wherein said second coil is placed around a component of said vehicle proximate to said second location, wherein said component is either a hinge or an element of a door latch mechanism.

19. A method of providing for sensing a magnetic perturbation of a vehicle as recited in claim 15, wherein the operation of generating said at least one signal comprises generating a signal responsive to said at least a portion of said magnetic flux generated by said second coil.

20. A magnetic crash sensing system of a vehicle, comprising:

a first coil at a first location of the vehicle;

a plurality of magnetic sensing elements at a plurality of second locations of the vehicle, wherein said first location is selected from one of a location proximate to a B-pillar of said vehicle, a location proximate to an A-pillar of said vehicle, and a location proximate to a C-pillar of said vehicle, and said plurality of second locations are selected from another of a location proximate to an A-pillar of said vehicle, a location proximate to a C-pillar of said vehicle, and a location proximate to a B-pillar of said vehicle;

a time varying signal applied to said first coil, wherein said first coil generates magnetic flux within a body or structure of said vehicle responsive to said time varying signal; and

a processor operatively associated with said plurality of magnetic sensing elements, wherein said processor generates a signal responsive to a perturbation of said vehicle responsive to at least one of a plurality of signals from said corresponding plurality of magnetic sensing elements.