Apparatus and method for measuring weight of an occupying item of a seat

• US 20010037903A1
• Filed: 05/04/2001
• Published: 11/08/2001
• Est. Priority Date: 06/07/1995
• Status: Active Grant

• Current Assignee: American Vehicular Sciences LLC (Acacia Research Corporation)
• Original Assignee: Automotive Technologies International Incorporated
• Inventors: Breed, David S., Johnson, Wendell C., DuVall, Wilbur E.
• Granted Patent: US 6,689,962 B2
• Time in Patent Office: Days
• US Class Current: 177/25.13
• CPC Class Codes: B60N 2/002 Seats provided with an occupancy detection means mounted therein or thereon detection means responsive to presence or absence of children B60N2/266
• CPC Class Codes: B60N 2/015 Attaching seats directly to vehicle chassis
• CPC Class Codes: B60N 2/0224 Non-manual adjustments, e.g. with electrical operation
• CPC Class Codes: B60N 2/02246 Electric motors therefor
• CPC Class Codes: B60N 2/0244 with logic circuits
• CPC Class Codes: B60N 2/0248 with memory of positions
• CPC Class Codes: B60N 2/0252 with relations between different adjustments, e.g. height of headrest following longitudinal position of seat
• CPC Class Codes: B60N 2/0268 using sensors or detectors for adapting the seat or seat part, e.g. to the position of an occupant
• CPC Class Codes: B60N 2/0272 using sensors or detectors for detecting the position of seat parts
• CPC Class Codes: B60N 2/0276 reaction to emergency situations, e.g. crash
• CPC Class Codes: B60N 2/06 slidable B60N2/12 , B60N2/2209 take precedence
• CPC Class Codes: B60N 2/067 by linear actuators, e.g. linear screw mechanisms
• CPC Class Codes: B60N 2/28 Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
• CPC Class Codes: B60N 2/2806 for securing the child seat to the vehicle
• CPC Class Codes: B60N 2/2863 backward facing
• CPC Class Codes: B60N 2/66 Lumbar supports
• CPC Class Codes: B60N 2/68 Seat frames
• CPC Class Codes: B60N 2/806 movable or adjustable
• CPC Class Codes: B60N 2/809 vertically slidable
• CPC Class Codes: B60N 2/829 characterised by their adjusting mechanisms, e.g. electric motors
• CPC Class Codes: B60N 2/853 : characterised by their adjusting mechanisms, e.g. electric motors
• CPC Class Codes: B60N 2/888 : with arrangements for protecting against abnormal g-forces, e.g. by displacement of the head-rest
• CPC Class Codes: B60R 2021/26094 : characterised by fluid flow controlling valves
• CPC Class Codes: B60R 2021/2765 : comprising means to control the venting
• CPC Class Codes: B60R 2022/288 : with means to adjust or regulate the amount of energy to be absorbed
• CPC Class Codes: B60R 2022/4685 : with means to adjust or regulate the tensioning force in relation to external parameters
• CPC Class Codes: B60R 21/01516 : using force or pressure sensing means
• CPC Class Codes: B60R 21/01526 : using piezoelectric elements
• CPC Class Codes: B60R 21/0153 : using field detection presence sensors
• CPC Class Codes: B60R 21/01536 : using ultrasonic waves
• CPC Class Codes: B60R 21/01542 : detecting passenger motion
• CPC Class Codes: B60R 21/01554 : Seat position sensors
• CPC Class Codes: B60R 21/203 : in steering wheels or steering columns
• CPC Class Codes: B60R 22/201 : with the belt anchor connected to a slider movable in a vehicle-mounted track for passive restraint systems B60R22/06
• CPC Class Codes: G01G 19/4142 : for controlling activation of safety devices, e.g. airbag systems electrical circuits for triggering safety arrangements in case of vehicle accidents B60R21/015
• CPC Class Codes: G01G 23/3728 : with wireless means
• CPC Class Codes: G01S 15/06 : Systems determining the position data of a target
• CPC Class Codes: G01S 15/87 : Combinations of sonar systems
• CPC Class Codes: G01S 15/88 : Sonar systems specially adapted for specific applications seismic or acoustic prospecting or detecting G01V1/00

Abstract

Vehicle seat including a cushion defining a surface adapted to support an occupying item, a spring system arranged underneath the cushion and a sensor arranged in association with the spring system and/or cushion for generating a signal based on downward movement of the cushion caused by occupancy of the seat which is indicative of the weight of the occupying item. The sensor can be a spring retained at both ends and which is tensioned upon downward movement of the cushion whereby a force in the spring indicative of weight of the occupying item is measured. The sensor can also include strain gages, e.g., SAW strain gages.

Claims

1. A vehicle seat, comprising:

a cushion defining a surface adapted to support an occupying item;

a spring system arranged underneath said cushion; and

a sensor arranged in association with said spring system for generating a signal based on downward movement of said cushion caused by occupancy of the seat which is indicative of the weight of the occupying item.

2. The seat of

claim 1

, wherein said spring system is in contact with said sensor.

3. The seat of

claim 1

, wherein said sensor is a displacement sensor structured and arranged to measure displacement of said spring system caused by occupancy of the seat.

4. The seat of

claim 1

, wherein said sensor is structured and arranged to measure deflection of a bottom of said cushion.

5. The seat of

claim 1

, wherein said sensor comprises:

a spring retained at both ends and which is tensioned upon downward movement of said spring system; and

measuring means for measuring a force in said spring indicative of weight of the occupying item.

6. The seat of

claim 5

, wherein said measuring means comprise a strain gage for measuring strain of said spring.

7. The seat of

claim 5

, wherein said measuring means comprise a force measuring device.

8. The seat of

claim 1

, wherein said sensor comprises a support, a cable retained at one end by said support and a length measuring device arranged at an opposite end of said cable for measuring elongation of said cable indicative of weight of the occupying item.

9. The seat of

claim 8

, wherein said length measuring device comprises a cylinder, a rod arranged in said cylinder and connected to the opposite end of said cable, a spring arranged in said cylinder and connected to said rod to resist elongation of said cable and windings arranged in said cylinder whereby the amount of coupling between said windings provides an indication of the extent of elongation of said cable.

10. The seat of

claim 1

, wherein said sensor is arranged entirely underneath said spring system.

11. The seat of

claim 1

, wherein said sensor comprises at least one SAW strain gage.

12. The seat of

claim 1

, wherein said sensor is structured and arranged to measure a physical state of said spring system.

13. A method for measuring weight of an occupying item on a seat cushion of a vehicle, comprising the steps of:

arranging a spring system arranged underneath the cushion; and

arranging a sensor in association with at least one of the spring system and cushion for generating a signal based on downward movement of the cushion caused by the occupying item which is indicative of the weight of the occupying item

14. The method of

claim 13

, further comprising the step of arranging the spring system in contact with the sensor.

15. The method of

claim 13

, wherein the step of arranging a sensor in association with the cushion comprises the steps of retaining a spring at both ends which is tensioned upon downward movement of the spring system and measuring a force in the spring indicative of weight of the occupying item.

16. The method of

claim 15

, wherein the force in the spring is strain and is measured by a strain gage.

17. The method of

claim 13

, wherein the step of arranging a sensor underneath the cushion comprises the steps of retaining a cable at one end by a support and at an opposite end by a length measuring device, and measuring elongation of the cable indicative of weight of the occupying item.

18. A weight sensor system for measuring weight applied to a seat cushion supported by supports at its edges, comprising:

a spring system adapted to be arranged underneath the cushion and extend between said supports; and

a sensor arranged in association with at least one of said spring system and the cushion for generating a signal indicative of the weight applied to the cushion based on downward movement of the cushion caused by the weight applied to the cushion.

19. The sensor system of

claim 18

, wherein said spring system is in contact with said sensor.

20. The sensor system of

claim 18

, wherein said sensor is arranged underneath said spring system.

21. The sensor system of

claim 18

, wherein said sensor comprises:

a spring adapted to be retained at both ends on the supports and which is tensioned upon downward movement of said spring system; and

measuring means for measuring a force in said spring indicative of weight of the occupying item.

22. The sensor system of

claim 21

, wherein said measuring means comprise a strain gage for measuring strain of said spring.

23. The sensor system of

claim 21

, wherein said measuring means comprise a force measuring device.

24. The sensor system of

claim 18

, wherein said sensor comprises at least one SAW strain gage.

25. A vehicle including an arrangement for controlling a component based on an occupying item of the vehicle, comprising:

a cushion defining a surface adapted to support the occupying item;

a spring system arranged underneath said cushion;

a sensor arranged in association with said spring system for generating a signal indicative of the weight of the occupying item based on downward movement of said cushion caused by occupancy of the seat; and

a processor coupled to said sensor for receiving the signal indicative of the weight of the occupying item and generating a control signal for controlling the component.

26. The vehicle of

claim 25

, wherein said spring system is in contact with said sensor.

27. The vehicle of

claim 25

, wherein said sensor is arranged underneath said spring system.

28. The vehicle of

claim 25

, wherein said sensor is a displacement sensor structured and arranged to measure displacement of said spring system caused by occupancy of the seat.

29. The vehicle of

claim 25

, wherein said sensor comprises:

a spring retained at both ends and which is tensioned upon downward movement of said spring system; and

measuring means for measuring a force in said spring indicative of weight of the occupying item.

30. The vehicle of

claim 29

, wherein said measuring means comprise a strain gage for measuring strain of said spring.

31. The vehicle of

claim 25

, wherein said measuring means comprise a force measuring device.

32. The vehicle of

claim 25

, wherein the component is an airbag system.

33. The vehicle of

claim 25

, wherein said sensor comprises at least one SAW strain gage.

34. A method for controlling a component in a vehicle based on an occupying item, comprising the steps of:

arranging a spring system arranged underneath a cushion on which the occupying item may rest;

arranging a sensor in association with the cushion for generating a signal based on downward movement of the cushion caused by the occupying item which is indicative of the weight of the occupying item; and

controlling the component based on the signal indicative of the weight of the occupying item.

35. The method of

claim 34

, further comprising the step of arranging the spring system in contact with the sensor.

36. The method of

claim 34

, wherein the step of arranging a sensor in association with the cushion comprises the steps of retaining a spring at both ends which is tensioned upon downward movement of the spring system and measuring a force in the spring indicative of weight of the occupying item.

37. The method of

claim 34

, wherein the force in the spring is strain and is measured by a strain gage.

38. The method of

claim 34

, wherein the step of arranging a sensor underneath the cushion comprises the steps of retaining a cable at one end by a support and at an opposite end by a length measuring device, and measuring elongation of the cable indicative of weight of the occupying item.