Mass profiling system

• US 6,497,430 B1
• Filed: 03/03/1999
• Issued: 12/24/2002
• Est. Priority Date: 03/03/1999
• Status: Expired due to Term

• Current Assignee: Sensitron
• Original Assignee: Sensitron
• Inventors: Beck, David, Danielson, Thomas, Montano, Cesar A., Odom, Douglas
• Primary Examiner(s): Dickson, Paul N.
• Assistant Examiner(s): Draper, Deann L.
• Application Number:
  US09/261,695
• Time in Patent Office: 1,392 Days
• Field of Search: 280/735, 180/273, 738/623.8, 731/72, 738/623.81, 738/623.38
• US Class Current: 280/735
• CPC Class Codes: B60R 21/01516 using force or pressure sensing means
• CPC Class Codes: B60R 21/01526 using piezoelectric elements

Abstract

An air bag system has an array of detectors positioned under the seat material of a vehicle seat upon which a person or mass can be positioned. The array has a plurality of sensor leaves extending from a plurality of sensor branches. The branches extend from a trunk. Each sensor is of the type which predictably changes resistance upon the mechanical deflection thereof. A deflector is positioned to concentrate the deflection forces on the sensor leaf. Each sensor leaf has a substrate with conductive material on one side and a backer on the other. The sensor array output is supplied to a terminal and then to operation means which are connected to arm or disarm an air bag actuator to regulate the operation of the air bag in accordance with the mass such as an occupant or a child car seat on the vehicle seat. Each sensor leaf senses the force of the mass in a segment or quadrant and supplies the signals to a computer which processes and compares to known data to regulate the enabling or disabling of the air bag actuator.

Claims

1. A detector for positioning proximate to a support surface having a plurality of sectors, said detector being operable for detecting a force being applied at one or more locations of a plurality of spaced apart locations on said support surface, said detector comprising:

a sensor mat for positioning proximate to a support surface having a plurality of sectors which support surface is deflectable at a plurality of spaced apart locations, each of said sectors having one location of said plurality of locations therewithin, said sensor mat having a flexible and deflectable substrate positioned to be mechanically deflected upon mechanical deflection of said support surface at said plurality of spaced apart locations on said support surface upon application of a force to said support surface at each of said plurality of locations, said sensor mat being formed to have a plurality of sensors spaced apart and each positioned to sense the mechanical deflection of said support surface at one location of said plurality of spaced apart locations, each sensor of said plurality of sensors of said sensor mat being positioned proximate the said one location in each said sector of said plurality of sectors, and each sensor of said plurality of sensors being of the type which predictably changes electrical resistance upon the deflection thereof by application of a force thereto and said substrate of each said sensor of said plurality of sensors extending longitudinally with a longitudinal axis and being configured to deflect about a transverse axis which is transverse to said longitudinal axis of said substrate upon application of the force to said location in its respective sector, an electrically conductive composition being deposited on said substrate to be deflected with said substrate about said transverse axis;

conductor means connected to each said sensor of said plurality of sensors to supply electrical power thereto and connected to said each sensor of said plurality of sensors to transmit therefrom signals reflective of said changes in said measurable electrical resistance of each sensor of said plurality of sensors, said conductor means including a trunk member with a plurality of branch members extending therefrom with said branch member being formed to have at least one sensor of said plurality of sensors;

a deflector mechanism positioned relative to each sensor of said plurality of sensors for contacting and deflecting a respective said sensor upon application of said force in said sector of said support surface; and

terminal means conductively connected to said conductor means for electrical connection to a source of electrical power for receiving and supplying electrical power to said sensor mat and for electrical connection to an external circuit configured to receive signals reflective of said changes in the measurable electrical resistance of said one sensor.

2. The detector of claim 1 wherein said deflector has a longitudinal axis generally in alignment with said transverse axis.

3. The detector of claim 2 wherein said substrate has a width, wherein said deflector is shaped to act as a fulcrum about which said substrate deflects upon application said force at said location, said deflector being sized to extend substantially the width of said substrate.

4. The detector of claim 3 wherein said deflector is cylindrical in shape.

5. The detector of claim 1 wherein said support surface includes the outer material layer of a seat structure for use in a vehicle.

6. The detector of claim 1 wherein said support surface includes the back material layer of a seat structure.

7. A detector for positioning relative to a support surface, said detector being operable for detecting a pressure applied at one or more locations of a plurality of spaced apart locations on said support surface, said detector comprising:

a sensor mat for positioning relative to said support surface which support surface is deflectable at a plurality of spaced apart locations, said support surface having a plurality of sectors each having one location of said plurality of locations therewithin, said sensor mat having a flexible and deflectable substrate positioned to be mechanically deflected with said support surface at each location of said plurality of spaced apart locations upon application of pressure to said support surface at least one location of said plurality of locations, said sensor mat being formed to have a plurality of sensors in an array each spaced apart and each positioned with a portion for mechanical deflection upon the deflection of said support surface at each location of said plurality of locations and each sensor of said plurality of sensors being of the type which predictably changes electrical resistance upon mechanical deflection of a portion thereof, said array being generally rectilinear in projection, each sensor of said plurality of sensors of said sensor mat having a portion positioned proximate one sector of said plurality of sectors of said support surface, said substrate of each said sensor of said plurality of sensors extending longitudinally with a longitudinal axis and configured to deflect about a transverse axis which is transverse to said longitudinal axis of said substrate upon application of said pressure to said location in its respective sector, and an electrically conductive composition being deposited on said substrate to be deflected with said substrate about said transverse axis;

conductor means connected to each sensor of said plurality of sensors to supply electrical power thereto and to transmit therefrom signals reflective of changes in said measurable electrical resistance of each sensor of said plurality of sensors, said conductor means including a trunk member with a six branch members extending therefrom with each said branch member being formed to have at least one sensor of said plurality of sensors; and

terminal means electrically associated with said conductor means for electrical connection to a source of electrical power for receiving and supplying electrical power to said plurality of said sensors and for electrical connection to an external circuit configured to receive signals reflective of the changes in the measurable electrical resistance each sensor of said plurality of sensors.

8. The detector of claim 7 wherein each sensor of said plurality of sensors of said sensor mat has a portion positioned proximate a sector of said surface to supply a signal reflecting a change in said electrical characteristic upon application of said pressure to said surface at said location in each of said plurality of sectors.

9. The detector of claim 7 wherein said six branch members includes two central members each having five sensors of said plurality of sensors.

10. The detector of claim 7 wherein said six branch members includes two outer members each having three sensors of said plurality of sensors.

11. The detector of claim 7 wherein said six branch members includes a left inboard member and a right inboard member each having six sensors of said plurality of sensors.

12. The detector of claim 7 wherein said six branch members includes 22 sensors.

13. The detector of claim 7 wherein said six branch members includes 24 sensors.

14. The detector of claim 7 wherein said six branch members includes two central members each having four sensors of said plurality of sensors secured thereto, two outer members each having three sensors of said plurality of sensors secured thereto, a left inboard member having six sensors of said plurality of sensors secured thereto and a right inboard member each having six sensors of said plurality of sensors secured thereto.

15. A sensor array for detecting deflection at a plurality of locations on said array, said array including:

a plurality of sensors positioned proximate a deflectable surface and configured in an array with each sensor positioned for mechanical deflection of a portion thereof upon the deflection at a plurality of locations of said deflectable surface, each sensor of said plurality of sensors being of the type which has a flexible and deflectable substrate and predictably and measurably changes electrical resistance upon the deflection of a portion thereof, said deflectable and flexible substrate of each sensor of said plurality of sensors having a longitudinal axis deflectable about a transverse axis which is transverse to said longitudinal axis and each sensor of said plurality of sensors including a conductive ink deposited on said substrate;

conductor means connected to each of said sensors to supply electrical power thereto and to transmit therefrom signals reflective of changes in said electrical resistance of each of said sensors upon the deflection of said deflectable surface; and

terminal means electrically conductively connected to said conductor means for electrical connection to a source of electrical power for receiving and supplying electrical power to sensors of said plurality of said sensors and for electrical connection to an external circuit configured to receive signals reflective of the changes in the electrical resistance of each of said sensors.

16. The sensor array of claim 15 wherein said conductor means includes a trunk member with a plurality of branch members connected thereto and extending therefrom, each trunk member being formed to have at least one sensor of said plurality of sensors.

17. The sensor array of claim 16 wherein said array includes six branch members each spaced from the others.

18. The sensor array of claim 17 wherein said six branch members includes two central members each having five sensors of said plurality of sensors.

19. The sensor array of claim 17 wherein said six branch members includes two outer members each having three sensors of said plurality of sensors.

20. The sensor array of claim 17 wherein said six branch members includes a left inboard member and a right inboard member each having six sensors of said plurality of sensors.

21. The sensor array of claim 17 wherein said six branch members includes 22 sensors.

22. The sensor array of claim 17 wherein said six branch members includes 24 sensors.

23. The sensor array of claim 17 wherein said six branch members includes two central members each having four sensors of said plurality of sensors formed therewith, two outer members each having three sensors of said plurality of sensors formed therewith, a left inboard member having six sensors of said plurality of sensors formed therewith and a right inboard member each having six sensors of said plurality of sensors formed therewith.

24. The sensor array of claim 17 wherein said sensor array is generally polygonal in projection.

25. A sensor mechanism for detecting deflection at a plurality of locations on an associated surface, said mechanism including:

a plurality of sensors each positioned for mechanical deflection of a portion thereof upon the deflection at a respective location of a plurality of locations of an associated surface and each sensor of said plurality of sensors being of the type which has a flexible and deflectable substrate and predictably and measurably changes electrical resistance upon the deflection of a portion of said flexible and deflectable substrate, said flexible and deflectable substrate of each sensor of said plurality of sensors having a longitudinal axis and a width with a transverse axis;

conductor means connected to each of said sensors to supply electrical power thereto and to transmit therefrom signals reflective of changes in said electrical resistance of each of said sensors upon the deflection of said associated surface;

terminal means electrically conductively connected to said conductor means for electrical connection to a source of electrical power for receiving and supplying electrical power to sensors of said plurality of said sensors and for electrical connection to an external circuit configured to receive signals reflective of the changes in the electrical resistance of each of said sensors; and

deflector means positioned relative to each sensor of said plurality of sensors for deflecting each said sensor of said plurality of sensors upon deflection of said associated surface and said deflector means having a longitudinal axis generally in alignment with said transverse axis.

26. The sensor mechanism of claim 25 wherein said deflector means is shaped to act as a fulcrum about which said flexible and deflectable substrate may deflect, and wherein said deflector means is sized to extend substantially the width of said flexible and deflectable substrate.

27. The sensor mechanism of claim 25 wherein said deflector mens is cylindrical in shape.

28. A system for detecting the presence and relative magnitude of pressures applied at a plurality of spaced apart locations on an exterior substrate and for generating signals reflective of the profile and the magnitude of the pressures relative to each other applied at said plurality of locations, said system comprising:

an exterior substrate which is deflectable upon the application of a pressure at all locations of a plurality of locations, said exterior substrate having a plurality of sectors each having one said location;

a base positioned proximate said exterior substrate;

a sensor mat positioned between said base and said exterior substrate to be mechanically deflected upon mechanical deflection of said exterior substrate at each of said plurality of locations upon application of said pressures at each of said locations, said sensor mat having a flexible and deflectable substrate formed with a plurality of sensors each positioned for mechanical deflection of a portion thereof upon the deflection of said exterior substrate at said plurality of locations and each sensor of said plurality of sensors being of the type which predictably changes a electrical resistance upon mechanical deflection of a portion thereof, a sensor of said plurality of sensors of said sensor mat being positioned proximate each sector of said substrate to supply a signal reflecting a change in said electrical resistance upon application of pressure to said exterior substrate in said sector, said flexible and deflectable substrate of each said sensor being configured to have a longitudinal axis and to deflect about a transverse axis transverse to said longitudinal axis and each said sensor having an electrically conductive composition deposited on said flexible and deflectable substrate in a pattern to be deflected with said flexible and deflectable substrate about said transverse axis;

conductor means connected to each of said sensors to supply electrical power thereto and to transmit therefrom signals reflective of changes in said electrical resistance of each of said sensors upon the application of a said pressure to said exterior substrate, said conductor means including a trunk member with a plurality of six branch members attached there to and extending away therefrom, each branch member having at least one sensor of said plurality of sensors formed therewith;

terminal means electrically associated with said conductor means for electrical connection to a source of electrical power for receiving and supplying electrical power to sensors of said plurality of said sensors and for electrical connection to an external circuit configured to receive signals reflective of the changes in the electrical resistance of each of said and

a deflector mechanism positioned relative to each of said plurality of sensors for contacting said sensor upon application of said pressure.

29. The system of claim 28 wherein said deflector has a longitudinal axis generally in alignment with said transverse axis, wherein said flexible and deflectable substrate has a width, wherein said deflector is shaped to act as a fulcrum about which said flexible and deflectable substrate may deflect upon application of said pressure;

and wherein said deflector is sized to extend substantially the width of said flexible and deflectable substrate.

30. The system of claim 29 wherein said exterior surface is the outer material layer of a vehicle seat and said base is the structure of said vehicle seat for supporting said outer material layer.