Vehicle occupant sensing system

• US 6,441,363 B1
• Filed: 02/23/2000
• Issued: 08/27/2002
• Est. Priority Date: 02/24/1999
• Status: Expired due to Fees

• Current Assignee: Siemens VDO Automotive Corporation (Siemens AG)
• Original Assignee: Siemens VDO Automotive Corporation (Siemens AG)
• Inventors: Clark, Mark, Clark, Jeff, Reich, Dan, Peterson, Lauren M., Quail, Alanna, OʼRourke, Dan, Witt, Paul, Cook, Charles R. Jr., Braunwarth, Hubert
• Primary Examiner(s): PYO, KEVIN K
• Application Number:
  US09/510,688
• Time in Patent Office: 916 Days
• Field of Search: 250/221, 250/DIG.1, 250/239, 280/734, 280/735, 180/271, 180/273, 180/282, 340/436, 340/438, 340/555, 340/556, 340/557, 382/100, 382/104, 701/45
• US Class Current: 250/221
• CPC Class Codes: B60R 2001/1223 with sensors or transducers
• CPC Class Codes: B60R 2001/1253 with cameras, video cameras or video screens
• CPC Class Codes: B60R 21/01534 using electromagneticwaves, e.g. infrared
• CPC Class Codes: B60R 21/01538 for image processing, e.g. cameras or sensor arrays
• CPC Class Codes: G01S 17/04 Systems determining the presence of a target
• CPC Class Codes: G01S 17/87 Combinations of systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/88 Lidar systems specially adapted for specific applications
• CPC Class Codes: G01S 7/4802 using analysis of echo signal for target characterisation; Target signature; Target cross-section
• CPC Class Codes: G01S 7/4811 common to transmitter and receiver

Abstract

A vehicle occupant sensing system includes a laser array that generates three beams. A first beam is directed toward an upper body zone, a second beam is directed toward a middle body zone, and a third beam is directed toward a lower body zone. A first sensor assembly receives reflection beams from the upper body zone and generates a first signal that represents a proportional amount of an occupant present in the upper body zone. A second sensor assembly receives reflection beams from the middle body zone and generates a second signal that represents a proportional amount of the occupant present in the middle body zone. A third sensor assembly receives reflection beams from the lower body zone and generates a third signal that represents a proportional amount of the occupant present in the lower body zone. The laser array and the first, second, and third sensor assemblies are all mounted within a common housing that is mounted to a vehicle structure such as an A-pillar or rear view mirror. A central processor receives the first, second, and third signals and combines the signals to generate a control signal representative of the position of the occupant within the vehicle. The control signal is used to control deployment of an airbag based on the position of the occupant within the vehicle.

Claims

1. A vehicle occupant sensing system comprising:

a single laser array mounted to a vehicle structure for generating a first beam directed toward a first occupant zone, a second beam directed toward a second occupant zone, and a third beam directed toward a third occupant zone with said first, second and third beams all being generated from generally the same location on said vehicle structure;

a first sensor assembly for receiving reflection beams resulting from said first beam hitting a first portion of an occupant located in said first zone, said first sensor assembly generating a first signal proportionally representing said first portion of the occupant present in said first zone;

a second sensor assembly for receiving reflection beams resulting from said second beam hitting a second portion of the occupant located in said second zone, said second sensor assembly generating a second signal proportionally representing said second portion of the occupant present in said second zone;

a third sensor assembly for receiving reflection beams resulting from said third beam hitting a third portion of the occupant located in said third zone, said third sensor assembly generating a third signal proportionally representing said third portion of the occupant present in said third zone; and

a central processor for receiving said first, second, and third signals and combining said signals to determine the position of the occupant within the vehicle.

2. A system according to claim 1 wherein said first zone is defined as an area normally occupied by an upper portion of the occupant, said second zone is defined as an area normally occupied by a middle portion of the occupant, and said third zone is defined as an area normally occupied by a lower portion of the occupant.

10. A system according to claim 1 including an airbag system wherein said processor generates a control signal for controlling deployment of an airbag based on the position of the occupant within the vehicle.

11. A system according to claim 1 wherein each of said first, second, and third beams are at least forty degrees wide and at least three degrees thick.

12. A system according to claim 1 wherein each of said first, second, and third beams are spaced apart from one another by at least 10 degrees.

21. A system according to claim 1 wherein said vehicle structure comprises an upper vehicle structure and said first, second and third beams are all generated from a location generally in front of the occupant.

3. A vehicle occupant sensing system comprising:

a laser array mounted to a vehicle structure for generating a first beam directed toward a first occupant zone, a second beam directed toward a second occupant zone, and a third beam directed toward a third occupant zone;

a first sensor assembly for receiving reflection beams resulting from said first beam hitting a first portion of an occupant located in said first zone, said first sensor assembly generating a first signal proportionally representing said first portion of the occupant present in said first zone;

a second sensor assembly for receiving reflection beams resulting from said second beam hitting a second portion of the occupant located in said second zone, said second sensor assembly generating a second signal proportionally representing said second portion of the occupant present in said second zone;

a third sensor assembly for receiving reflection beams resulting from said third beam hitting a third portion of the occupant located in said third zone, said third sensor assembly generating a third signal proportionally representing said third portion of the occupant present in said third zone wherein said laser array and said first, second, and third sensor assemblies are mounted within a common housing; and

a central processor for receiving said first, second, and third signals and combining said signals to determine the position of the occupant within the vehicle.

4. A system according to claim 3 wherein said housing is mounted to a vehicle side member.

5. A system according to claim 3 wherein said housing is centrally mounted within the vehicle.

6. A system according to claim 3 wherein said laser array is comprised of a first laser element for generating said first beam, a second laser element for generating said second beam, and a third laser element for generating said third beam, said first, second, and third laser elements each being mounted with said common housing.

7. A system according to claim 6 including a lens mounted within said housing for controlling size and shape of said first, second, and third beams and for directing said first beam to said first zone, said second beam to said second zone, and said third beam to said third zone.

8. A system according to claim 7 wherein said first sensor assembly includes at least one sensor unit for receiving said reflection beams from said first zone, said second sensor assembly includes at least three sensor units for receiving said reflection beams from said second zone, and said third sensor assembly includes at least five sensor units for receiving said reflection beams from said third zone.

9. A system according to claim 8 wherein each of said sensor units is comprised of two triangular sensors mounted adjacent to each other to form a parallelogram.

13. A vehicle occupant sensing system comprising:

a housing mounted to a vehicle structure;

a laser array mounted within said housing for generating a first beam directed toward an upper zone, a second beam directed toward a middle zone, and a third beam directed toward a lower zone;

a first sensor assembly for receiving reflection beams from said upper zone, said first sensor assembly generating a first signal proportionally representing a first portion of an occupant present in said upper zone;

a second sensor assembly for receiving reflection beams from said middle zone, said second sensor assembly generating a second signal proportionally representing a second portion of the occupant present in said middle zone;

a third sensor assembly for receiving reflection beams from said lower zone, said third sensor assembly generating a third signal proportionally representing a third portion of the occupant present in said lower zone wherein said first, second, and third sensor assemblies are mounted within said housing;

a central processor for receiving said first, second, and third signals and combining said signals to generate a control signal representative of the position of the occupant within the vehicle

an airbag system for receiving said control signal such that deployment of an airbag is varied depending on the position of the occupant within the vehicle.

14. A system according to claim 13 wherein each of said first, second, and third beams are at least forty degrees wide and at least three degrees thick.

15. A system according to claim 14 wherein each of said first, second, and third beams are spaced apart from one another by at least 10 degrees.

16. A system according to claim 15 including a lens mounted within said housing for controlling size and shape of said first, second, and third beams and for directing said first beam to said upper zone, said second beam to said middle zone, and said third beam to said lower zone.

22. A system according to claim 13 wherein said first, second and third beams are all generated from generally the same location on said vehicle structure.

23. A system according to claim 22 wherein said laser array and said first, second, and third sensor assemblies are mounted within said housing.

17. A method for sensing an occupant position within a vehicle comprising the steps of:

generating a first laser beam from a first position in the vehicle toward a first zone;

generating a second laser beam from the first position toward a second zone;

generating a third laser beam from the first position toward a third zone;

receiving a reflection from the first laser beam when the first laser beam strikes a portion of an occupant in the first zone;

generating a first signal representing a first proportional amount of the occupant in the first zone;

receiving a reflection from the second laser beam when the second laser beam strikes a portion of an occupant in the second zone;

generating a second signal representing a second proportional amount of the occupant in the second zone;

receiving a reflection from the third laser beam when the third laser beam strikes a portion of an occupant in the third zone;

generating a third signal representing a third proportional amount of the occupant in the third zone; and

combining the first, second, and third signals to determine occupant position within the vehicle.

18. A method according to claim 17 including the step of generating a control signal representing occupant position within the vehicle and controlling deployment of an airbag based on the control signal.

19. A method according to claim 18 including the step of spacing the first, second, and third laser beams at least ten degrees apart from one another.

20. A method according to claim 19 including the step of each laser beam generating a curtain of light being at least forty degrees wide and three degrees thick.

24. A method according to claim 17 wherein the first position is a location generally in front of the occupant.

25. A method according to claim 24 further including the step of generating the first, second and third laser beams from a single laser array enclosed within a housing mounted within the vehicle at the first position.