US20010037692A1 - Weight sensing system - Google Patents
Weight sensing system Download PDFInfo
- Publication number
- US20010037692A1 US20010037692A1 US09/329,509 US32950999A US2001037692A1 US 20010037692 A1 US20010037692 A1 US 20010037692A1 US 32950999 A US32950999 A US 32950999A US 2001037692 A1 US2001037692 A1 US 2001037692A1
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- United States
- Prior art keywords
- seat
- weight
- seat frame
- sensing system
- occupant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
- G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
- G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
- G01G19/4142—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only for controlling activation of safety devices, e.g. airbag systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/70—Upholstery springs ; Upholstery
- B60N2/7094—Upholstery springs
Definitions
- the present invention relates an occupant weight sensing system suitable for a vehicle occupant restraint system.
- the inflatable restraint system typically includes an air bag stored in a housing module within an occupant compartment in the automotive vehicle, in close proximity to either a driver occupant or one or more passenger occupants.
- the air bag includes an inflation device and an impact sensing mechanism that deploys the air bag. During deployment, gas is emitted rapidly from the inflation device to deploy and expand the air bag at a predetermined rate to a fully inflated state.
- the fixed expansion rate of the air bag does not compensate for variations in occupant size.
- One technique of compensating for variations in occupant size is to measure occupant size, and adjust the deployment rate accordingly.
- the weight of the occupant can be estimated using a measuring device such as a strain gauge or a load cell mounted in a load path between the seat and a floor of the vehicle.
- Another type of measuring device is a fluid-filled bladder placed within the seat. While these types of measuring devices work well, it is desirable to provide a less expensive and more general measuring device which is not specific to a particular style of seat.
- an occupant weight sensing system that is independent of the type of seat, and accurately correlates with the weight of the occupant.
- the present invention is a weight sensing system for use in a seat disposed within an occupant compartment of a vehicle.
- the weight sensing system includes a sensing mechanism positioned on a seat frame of the seat for measuring a strain on the seat frame due to a seated occupant weight.
- One advantage of the present invention is that a weight sensing system is provided for a seat that utilizes a strain gauge mounted to a frame portion of the seat to measure the weight of the occupant through seat frame loading. Another advantage of the present invention is that the load applied to a seat suspension of the seat by the occupant can be directly correlated with the weight of the occupant. Still another advantage of the present invention is that the weight sensing system, including the strain gauge, can be incorporated on many different styles of seat frames with minimal modification.
- FIG. 1 is an elevational side view of a weight sensing system, illustrated in operational relationship with a seated occupant and vehicle.
- FIG. 2 is a perspective view of a weight sensing system of FIG. 1.
- FIG. 3 is a perspective view of a strain gauge for the weight sensing system of FIG. 2.
- FIG. 4 is a graph illustrating the relationship between the strain gauge measurement and the occupant weight for the weight sensing system of FIG. 2.
- FIGS. 1 through 3 one embodiment of a weight sensing system 10 , according to the present invention, is shown for a vehicle 12 .
- the vehicle 12 includes an occupant compartment 14 that contains a seat assembly 16 for supporting an occupant 18 .
- the seat assembly 16 is of a first row type, as is known in the art.
- the seat assembly 16 includes a generally horizontal seat portion 20 connected to a generally vertical or upright back portion 22 .
- the seat portion 20 is secured by suitable means (not shown) to a floor 24 of the vehicle 12 .
- the back portion 22 includes a back frame (not shown), and a padded portion 26 covering the back frame.
- the padded portion 26 is a foam material having a covering on an outer surface thereof, such as cloth, leather, vinyl or the like.
- the seat portion 20 includes a seat frame 28 , a seat support 30 , and a padded portion 32 covering the seat frame 28 and the seat support 30 .
- the seat frame 28 is a generally planar, rectangularly shaped member having a front portion 34 , a rear portion 36 opposite the front portion 34 , and side portions 38 connecting the front portion 34 and rear portion 36 .
- a center portion 40 of the seat frame 28 is open.
- the seat support 30 is operably positioned over the center portion 40 of the seat frame 28 , and applies a load to the seat frame 28 while supporting and distributing the weight of the seated occupant 18 .
- the seat support 30 is a suspension type system, as is known in the art.
- the seat support 30 is a generally planar member, operably connected to the seat frame 28 by a flexible member 42 .
- the seat support 30 is made from a woven cloth material, having elastic properties and the flexible member 42 is a metal hook.
- the seat support 30 could be made from a spring wire material arranged in a grid pattern.
- a plurality of hooks 42 connect a front edge of the seat support 30 to the front portion 34 of the seat frame 28 , and a plurality of hooks 42 connect a rear edge of the seat support 30 to the rear portion 36 of the seat frame 28 .
- the weight of a seated occupant 18 on a seat assembly 16 is distributed by the seat support 30 to the seat frame 28 , causing the seat frame 28 to deflect. It should be appreciated that when a occupant 18 sits on the seat assembly 16 , a certain percentage of the occupant's 18 weight, such as seventy-five percent (75%), is supported by the seat support 30 .
- the seat support 30 applies a load to the seat frame 28 at a stress concentration point. In this example, the stress concentration point is the point where the seat support 30 is attached to the seat frame 28 .
- the weight sensing system 10 includes a sensing mechanism 44 positioned at a stress concentration point on the seat frame 28 , to measure a strain or deflection of the seat frame 28 resulting from the stress on the seat frame 28 from the weight of a seated occupant 18 .
- positioning the sensing mechanism 44 at the stress concentration point does not limit the use of the sensing mechanism 44 to a particular style of seat frame 28 and seat support 30 .
- the deflection of the front portion 34 or rear portion 36 of the frame 28 can be measured, since the seat support 30 is attached at both the front portion 34 and rear portion 36 of the seat frame 28 .
- the number of sensing mechanisms 44 and their placement is experimentally derived.
- the sensing mechanism 44 is a strain gauge of the micro type.
- the strain gauge 44 is an electronic device that changes its resistance in a known manner, when subjected to a strain. In order to measure the change in resistance, a known voltage is applied across the strain gauge 44 and the output voltage is measured using a voltage measurement device (not shown) . The output voltage correlates directly with the change in strain of the object being measured.
- the weight sensing system 10 may also include an electronic module 46 that provides control of the strain gauge 44 .
- the electronic module 46 may also be in communication with an electronic controller (not shown).
- the electronic controller may determine the weight of the occupant 18 from the measured strain to determine the rate of deployment of an air bag (not shown).
- FIG. 4 a correlation between the measured strain or deflection of the seat frame 28 as a result of a load applied to the seat frame 28 from the weight of a seated occupant 18 is illustrated.
- the x-axis 50 represents an actual load in pounds of a seated occupant 18 on the seat portion 20 .
- the y-axis 52 represents a strain gauge 44 measurement at a stress concentration point. In this example, the measured strain at three different stress concentration points 54 , 56 and 58 is illustrated.
- the resulting measured strain 54 , 56 and 58 demonstrates a direct relationship, which in this example is polynomial, between the load applied by the weight of a seated occupant 18 through the seat support 30 to the seat frame 28 , and the measured strain 54 , 56 and 58 .
- the actual weight of the seated occupant 18 can be extracted.
- the deployment force of the air bag can be adjusted depending on the weight of the seated occupant 18 .
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Seats For Vehicles (AREA)
- Air Bags (AREA)
Abstract
Description
- The present invention relates an occupant weight sensing system suitable for a vehicle occupant restraint system.
- It is known to provide a passive restraint system, such as a seat belt, to restrain a vehicle occupant. Another known restraint system is an active restraint system, such as an inflatable system. The inflatable restraint system typically includes an air bag stored in a housing module within an occupant compartment in the automotive vehicle, in close proximity to either a driver occupant or one or more passenger occupants. The air bag includes an inflation device and an impact sensing mechanism that deploys the air bag. During deployment, gas is emitted rapidly from the inflation device to deploy and expand the air bag at a predetermined rate to a fully inflated state.
- Although the above air bag has worked well, the fixed expansion rate of the air bag does not compensate for variations in occupant size. One technique of compensating for variations in occupant size is to measure occupant size, and adjust the deployment rate accordingly. For example, the weight of the occupant can be estimated using a measuring device such as a strain gauge or a load cell mounted in a load path between the seat and a floor of the vehicle. Another type of measuring device is a fluid-filled bladder placed within the seat. While these types of measuring devices work well, it is desirable to provide a less expensive and more general measuring device which is not specific to a particular style of seat. Thus, there is a need in the art for an occupant weight sensing system that is independent of the type of seat, and accurately correlates with the weight of the occupant.
- It is, therefore, one object of the present invention to provide a weight sensing system that determines the weight of an occupant through seat frame loading. It is another object of the present invention to use a strain gauge to measure a load on the seat frame.
- To achieve the foregoing objects, the present invention is a weight sensing system for use in a seat disposed within an occupant compartment of a vehicle. The weight sensing system includes a sensing mechanism positioned on a seat frame of the seat for measuring a strain on the seat frame due to a seated occupant weight.
- One advantage of the present invention is that a weight sensing system is provided for a seat that utilizes a strain gauge mounted to a frame portion of the seat to measure the weight of the occupant through seat frame loading. Another advantage of the present invention is that the load applied to a seat suspension of the seat by the occupant can be directly correlated with the weight of the occupant. Still another advantage of the present invention is that the weight sensing system, including the strain gauge, can be incorporated on many different styles of seat frames with minimal modification.
- Other objects, features and advantages of the present invention will be readily appreciated as the same becomes better understood after reading the subsequent description when considered in connection with the accompanying drawings.
- FIG. 1 is an elevational side view of a weight sensing system, illustrated in operational relationship with a seated occupant and vehicle.
- FIG. 2 is a perspective view of a weight sensing system of FIG. 1.
- FIG. 3 is a perspective view of a strain gauge for the weight sensing system of FIG. 2.
- FIG. 4 is a graph illustrating the relationship between the strain gauge measurement and the occupant weight for the weight sensing system of FIG. 2.
- Referring to the drawings, and in particular FIGS. 1 through 3, one embodiment of a
weight sensing system 10, according to the present invention, is shown for avehicle 12. Thevehicle 12 includes anoccupant compartment 14 that contains aseat assembly 16 for supporting anoccupant 18. It should be appreciated that theseat assembly 16 is of a first row type, as is known in the art. - The
seat assembly 16 includes a generallyhorizontal seat portion 20 connected to a generally vertical or upright back portion 22. Theseat portion 20 is secured by suitable means (not shown) to afloor 24 of thevehicle 12. The back portion 22 includes a back frame (not shown), and a paddedportion 26 covering the back frame. Preferably, thepadded portion 26 is a foam material having a covering on an outer surface thereof, such as cloth, leather, vinyl or the like. Theseat portion 20 includes aseat frame 28, aseat support 30, and a paddedportion 32 covering theseat frame 28 and the seat support 30. Theseat frame 28 is a generally planar, rectangularly shaped member having afront portion 34, arear portion 36 opposite thefront portion 34, andside portions 38 connecting thefront portion 34 andrear portion 36. Preferably, acenter portion 40 of theseat frame 28 is open. - The
seat support 30 is operably positioned over thecenter portion 40 of theseat frame 28, and applies a load to theseat frame 28 while supporting and distributing the weight of theseated occupant 18. In this example, theseat support 30 is a suspension type system, as is known in the art. Theseat support 30 is a generally planar member, operably connected to theseat frame 28 by aflexible member 42. Preferably, theseat support 30 is made from a woven cloth material, having elastic properties and theflexible member 42 is a metal hook. Alternatively, theseat support 30 could be made from a spring wire material arranged in a grid pattern. Preferably, a plurality ofhooks 42 connect a front edge of the seat support 30 to thefront portion 34 of theseat frame 28, and a plurality ofhooks 42 connect a rear edge of theseat support 30 to therear portion 36 of theseat frame 28. - In operation, the weight of a seated
occupant 18 on aseat assembly 16 is distributed by theseat support 30 to theseat frame 28, causing theseat frame 28 to deflect. It should be appreciated that when aoccupant 18 sits on theseat assembly 16, a certain percentage of the occupant's 18 weight, such as seventy-five percent (75%), is supported by theseat support 30. Theseat support 30 applies a load to theseat frame 28 at a stress concentration point. In this example, the stress concentration point is the point where theseat support 30 is attached to theseat frame 28. - The
weight sensing system 10 includes asensing mechanism 44 positioned at a stress concentration point on theseat frame 28, to measure a strain or deflection of theseat frame 28 resulting from the stress on theseat frame 28 from the weight of a seatedoccupant 18. Advantageously, positioning thesensing mechanism 44 at the stress concentration point, does not limit the use of thesensing mechanism 44 to a particular style ofseat frame 28 andseat support 30. In this example, the deflection of thefront portion 34 orrear portion 36 of theframe 28 can be measured, since theseat support 30 is attached at both thefront portion 34 andrear portion 36 of theseat frame 28. Preferably, the number ofsensing mechanisms 44 and their placement is experimentally derived. - Preferably, the
sensing mechanism 44 is a strain gauge of the micro type. Thestrain gauge 44 is an electronic device that changes its resistance in a known manner, when subjected to a strain. In order to measure the change in resistance, a known voltage is applied across thestrain gauge 44 and the output voltage is measured using a voltage measurement device (not shown) . The output voltage correlates directly with the change in strain of the object being measured. - The
weight sensing system 10 may also include anelectronic module 46 that provides control of thestrain gauge 44. Theelectronic module 46 may also be in communication with an electronic controller (not shown). Advantageously, the electronic controller may determine the weight of theoccupant 18 from the measured strain to determine the rate of deployment of an air bag (not shown). - Referring to FIG. 4, a correlation between the measured strain or deflection of the
seat frame 28 as a result of a load applied to theseat frame 28 from the weight of a seatedoccupant 18 is illustrated. Thex-axis 50 represents an actual load in pounds of aseated occupant 18 on theseat portion 20. The y-axis 52 represents astrain gauge 44 measurement at a stress concentration point. In this example, the measured strain at three differentstress concentration points strain seated occupant 18 through theseat support 30 to theseat frame 28, and the measuredstrain occupant 18 can be extracted. Advantageously, the deployment force of the air bag can be adjusted depending on the weight of the seatedoccupant 18. - The present invention has been described in an illustrative manner. It is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation.
- Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, within the scope of the appended claims, the present invention may be practiced other than as specifically described.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/329,509 US6360618B2 (en) | 1999-06-10 | 1999-06-10 | Weight sensing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/329,509 US6360618B2 (en) | 1999-06-10 | 1999-06-10 | Weight sensing system |
Publications (2)
Publication Number | Publication Date |
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US20010037692A1 true US20010037692A1 (en) | 2001-11-08 |
US6360618B2 US6360618B2 (en) | 2002-03-26 |
Family
ID=23285756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/329,509 Expired - Lifetime US6360618B2 (en) | 1999-06-10 | 1999-06-10 | Weight sensing system |
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US (1) | US6360618B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005012849A1 (en) * | 2003-07-30 | 2005-02-10 | Aisin Seiki Kabushiki Kaisha | Seat load detection device |
EP3078540A4 (en) * | 2013-12-03 | 2016-12-14 | Aisin Seiki | Seat occupancy detection device |
US10189570B2 (en) * | 2014-09-24 | 2019-01-29 | B/E Aerospace, Inc. | Seat pan assembly with encased comfort spring |
US10654435B2 (en) | 2017-02-22 | 2020-05-19 | Bgm Engineering, Inc. | Sensor module for use in low-cost weight measurement and sensing system |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050184496A1 (en) * | 2003-10-03 | 2005-08-25 | Speckhart Frank H. | Sensor pad for controlling airbag deployment and associated support |
JP3570629B2 (en) * | 2002-02-20 | 2004-09-29 | 株式会社デンソー | Occupant determination device using load sensor |
US6753780B2 (en) | 2002-03-15 | 2004-06-22 | Delphi Technologies, Inc. | Vehicle occupant detection system and method using radar motion sensor |
US6931940B2 (en) | 2002-10-02 | 2005-08-23 | Delphi Technologies, Inc. | Magnetostrictive strain sensor with hall effect |
US7059446B2 (en) * | 2003-06-27 | 2006-06-13 | Delphi Technologies, Inc. | Frame-based bladder apparatus for seat occupant weight estimation |
US6987229B2 (en) * | 2003-07-14 | 2006-01-17 | Delphi Technologies, Inc. | Frame-based occupant weight estimation apparatus having compliant linkage assembly |
US7308347B2 (en) * | 2003-07-14 | 2007-12-11 | Delphi Technologies, Inc. | Frame-based occupant weight estimation apparatus having compliant load transfer mechanism |
US6912920B2 (en) * | 2003-07-31 | 2005-07-05 | Delphi Technologies, Inc. | Frame-based occupant weight estimation load cell with ball-actuated force sensor |
US7194346B2 (en) | 2003-08-12 | 2007-03-20 | Delphi Technologies, Inc. | Universal occupant detection and discrimination system for a multi-place vehicle |
US6927678B2 (en) * | 2003-08-18 | 2005-08-09 | Delphi Technologies, Inc. | Fluid filled seat bladder with capacitive sensors for occupant classification and weight estimation |
JP2005338038A (en) * | 2004-04-28 | 2005-12-08 | Takata Corp | Seat load measuring device, and occupant protection system using same |
EP2374652B1 (en) | 2010-04-09 | 2016-06-08 | Fico Cables, Lda. | Seat cushion mat with pressure sensor |
LU92012B1 (en) * | 2012-05-30 | 2013-12-02 | Iee Sarl | Vehicle seat suspension mat |
EP2851239B1 (en) | 2013-09-23 | 2019-01-02 | Fico Cables Lda | Cushion mat with pressure sensor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5224924A (en) * | 1991-08-26 | 1993-07-06 | Urso Charles I | Back treatment device |
US5571056A (en) * | 1995-03-31 | 1996-11-05 | Gilbert; Raymond D. | Derailleur cable collet |
US5905210A (en) * | 1997-01-09 | 1999-05-18 | Automotive Systems Laboratory, Inc. | Villari effect seat weight sensor |
US5810392A (en) * | 1997-02-15 | 1998-09-22 | Breed Automotive Technology, Inc. | Seat occupant sensing system |
US5865463A (en) * | 1997-02-15 | 1999-02-02 | Breed Automotive Technology, Inc. | Airbag deployment controller |
US5975568A (en) * | 1998-04-01 | 1999-11-02 | American Components, Inc. | Sensor pad for controlling airbag deployment and associated support |
-
1999
- 1999-06-10 US US09/329,509 patent/US6360618B2/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005012849A1 (en) * | 2003-07-30 | 2005-02-10 | Aisin Seiki Kabushiki Kaisha | Seat load detection device |
US20070028702A1 (en) * | 2003-07-30 | 2007-02-08 | Aisin Seki Kabushiki Kaisha | Seat load detecting apparatus |
EP3078540A4 (en) * | 2013-12-03 | 2016-12-14 | Aisin Seiki | Seat occupancy detection device |
US10189570B2 (en) * | 2014-09-24 | 2019-01-29 | B/E Aerospace, Inc. | Seat pan assembly with encased comfort spring |
US10654435B2 (en) | 2017-02-22 | 2020-05-19 | Bgm Engineering, Inc. | Sensor module for use in low-cost weight measurement and sensing system |
Also Published As
Publication number | Publication date |
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US6360618B2 (en) | 2002-03-26 |
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