WO2004069590A2 - Systeme de detection capacitif, notamment pour interieur de vehicule automobile - Google Patents
Systeme de detection capacitif, notamment pour interieur de vehicule automobile Download PDFInfo
- Publication number
- WO2004069590A2 WO2004069590A2 PCT/FR2004/000038 FR2004000038W WO2004069590A2 WO 2004069590 A2 WO2004069590 A2 WO 2004069590A2 FR 2004000038 W FR2004000038 W FR 2004000038W WO 2004069590 A2 WO2004069590 A2 WO 2004069590A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- screen
- detection system
- capacitive sensor
- electrodes
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
- B60R21/01512—Passenger detection systems
- B60R21/0153—Passenger detection systems using field detection presence sensors
- B60R21/01532—Passenger detection systems using field detection presence sensors using electric or capacitive field sensors
-
- 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
- B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
- B60N2/003—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor mounting location in or on the seat
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
- G01G7/06—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electrostatic action
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2210/00—Sensor types, e.g. for passenger detection systems or for controlling seats
- B60N2210/10—Field detection presence sensors
- B60N2210/12—Capacitive; Electric field
Definitions
- Capacitive detection system especially for the interior of a motor vehicle.
- the present invention relates to capacitive detection systems, in particular for interiors of motor vehicles.
- the invention relates to a capacitive detection system comprising: at least one capacitive sensor comprising at least one first conductive electrode arranged to generate an electric field at least in a detection zone when said first electrode is subjected to an electrical potential, and an electronic control device connected at least to the first electrode, this control device being adapted to impose an electrical potential on the first electrode during at least one measurement period when electric charges accumulate on the first electrode and to read then, during a reading period, the electrical charges accumulated on said first electrode.
- This type of seat is generally satisfactory, but has the disadvantage that when the surface of the seat is wet (for example when a wet towel is placed on the seat, or when a previous user had wet clothes whose water has been partially absorbed by the seat, or when water vapor has condensed on the seat), the signal delivered by the capacitive sensor can indicate the presence of a person even in the absence of a seated user on the seat. The same problem can arise when a conductive object is placed on the seat.
- the present invention aims in particular to overcome this drawback, in particular to improve the reliability of the detection.
- a detection system of the kind in question is characterized in that it further comprises at least one conductive screen which covers substantially the whole of the first electrode of the capacitive sensor opposite the zone of detection, said first electrode being electrically isolated from said screen, in that the control device is connected to said screen and is adapted to impose an electrical potential on the screen at least during the measurement period, and in that the first electrode is connected to the control device by a first conductor provided with a screen adapted to prevent this conductor from diffusing an electric field to the outside, the screen being in electrical contact with the screen of said conductor.
- control device is adapted to electrically polarize the screen in the same direction as the first electrode relative to ground during the measurement period; the control device is adapted to impose the same electrical potential on the screen as on the first electrode during the measurement period;
- the control device is adapted to connect the screen to earth during the reading period;
- the capacitive sensor further includes a second conductive electrode adjacent to the first electrode, the control device being connected to the second electrode and being adapted to impose an electrical potential on said second electrode at least during the measurement period;
- the first and second electrodes of the capacitive sensor are arranged on the same conductive screen, which is electrically isolated from said second electrode;
- the first and second electrodes of the capacitive sensor are covered substantially entirely, opposite the detection zone, by two juxtaposed conductive screens which are electrically isolated from said first and second electrodes, each of the first and second electrodes having a distributed length " " substantially also on " the " two “ screens;
- the two electrodes of the capacitive sensor are substantially parallel to each other and wound in a spiral;
- the detection system further comprises a vehicle seat comprising at least one surface support intended to serve as a support for a user, the capacitive sensor being placed in the seat and the measurement zone being located outside the seat in front of the support surface;
- FIG. 1 is a schematic view of a vehicle comprising a detection system according to an embodiment of the invention
- FIG. 2 is a plan view of a sensor capacitive usable in the device of Figure 1
- Figure 3 is a detail view in section along line III-III of Figure 2, showing the capacitive sensor when it is in place in the seat
- Figure 4 is a partial detail view of the control circuit of the capacitive sensors of the vehicle of Figure 1
- Figures 5 to 8 are views similar to Figure 2, in four variants of the invention.
- the same references designate identical or similar elements.
- Figure 1 shows a motor vehicle 1 which has seats 2, one of which is visible in Figure 1, in this case the driver's seat.
- the invention would also be applicable to the other seats of the vehicle.
- the seat 2 has a seat 3 which has an upper support surface 4, and a backrest 5 which has a front support surface 6.
- the seat 3 and the backrest 5 define a reception space 7 located above of the seat 2 and in front of the backrest 4, which reception space is intended to receive a user 8 of the seat.
- the vehicle also comprises one or more inflatable safety bags (air bags), for example an inflatable safety bag 9 disposed in the central part 10 of the steering wheel 11 of the vehicle .
- inflatable safety bags air bags
- This inflatable safety bag can have several operating modes, for example two operating modes depending on whether one ignites one or the other of two explosive charges 12, 13 adapted to generate different volumes of gas at l inside the inflatable safety bag 9 during its deployment.
- a control device 14 such an electronic microcontroller (CONTR.), based on information coming in particular from: a shock sensor 16 such as an accelerometer or the like (SENS.), and a capacitive measurement device 17.
- This capacitive measurement device 17 may in particular be of the type described in document WO-A-00 / 25,098, and make it possible to perform a capacitive measurement of electrical permittivity in the reception area or detection area 7, so as to determine the presence and / or the position or posture of the user 8 on the seat, and / or its mass.
- Such a measuring device 17, can comprise for example a central electronic unit 18 (CPU) such as a microcontroller or microprocessor, connected to at least one control circuit 19 (CTRL) itself connected to one or preferably several capacitive sensors 20 each comprising at least one electrode disposed in particular in the seat 3 and / or the backrest 5, in the vicinity of the bearing surfaces, 4, 6 on which rests user 8.
- CPU central electronic unit
- CTR control circuit 19
- capacitive sensors 20 each comprising at least one electrode disposed in particular in the seat 3 and / or the backrest 5, in the vicinity of the bearing surfaces, 4, 6 on which rests user 8.
- the control circuit 19 causes an electric field to be generated in space 1, by applying a DC voltage V between the electrodes of each sensor 20 for periods. At the end of each measurement period, the control user 19 cuts said DC voltage and measures the charge accumulated by capacitive effect between the electrodes of each sensor 20, which makes it possible to know the electrical permittivity of the detection zone constituted by the space 7.
- control device 14 determines which of the loads 12, 13 it would trigger in order to deploy the inflatable safety bag 9 if the sensor 16 detected an impact suffered by the vehicle.
- the information coming from the detection device can also be used in the management of commands from other parts of the vehicle.
- this information could be taken into account, for example, in the context of the laws governing the control of various actuator devices such as vehicle suspensions, air conditioning, the brake distribution device, the attitude control device of the vehicle, etc.
- At least some of these capacitive sensors 20 have their electrodes 21 entirely arranged on at least one conductive screen 22 which extends substantially parallel to the corresponding bearing surface 4, 6, as shown in FIGS. 2 and 3.
- the two electrodes 21 of the capacitive sensor 20 are arranged towards the outside of the seat relative to the conductive screen 22, the assembly of the sensor 20 can advantageously be integrated into the padding 23 of the part of the seat where the sensor 20 is arranged (in this case, the seat 3 in the example of FIG. 3), a short distance below the outer covering cap 24 of this part of the seat .
- the screen 22 can be constituted for example by a metallic, copper or other sheet, a few hundredths or tenths of a millimeter thick, and the electrodes 21 are electrically insulated from this conductive sheet, for example by means of insulating sheaths 25 surrounding said electrodes.
- the electrodes 21 and the conductive screen 22 could also be produced by screen printing of a conductive material on insulating sheets made for example of polyester or other.
- the two electrodes 21 of the sensor 20 are wound in a spiral, at a substantially constant distance from each other, on the same conductive screen 22.
- each of these electrodes is connected to the control circuit 19 by two electrical conductors "'"" 26 "" which are '" do ' tes """ each " of a conductive shield 27 surrounding said electrical conductor 26 to prevent this conductor from generating an electric field out of the seat when it is energized.
- the shield 27 is itself preferably surrounded by an insulating sheath 28, and the conductive screen 22 is connected to the shield 27 of at least one of the electrical conductors 26, by a link 29.
- the electrical conductors 26 and their respective shields 27 could be produced by screen printing on polyester or other insulating sheets, each electrical conductor 26 then being in the form of a conductive line disposed between two larger superimposed conductive strips which form the shield, said conductive strips being isolated from the conductive line by interposition of insulating synthetic material.
- the control circuit 19 can impose a predetermined potential E on at least one of the two electrodes 21, on the electrical conductor corresponding 26, and where appropriate to the shielding 27 of the two electrical conductors 26, so that the conductive screen 22 is always at potential E when at least one of the two electrodes is at said potential E.
- the control device formed by the electronic central unit 18 and the control circuit 19 can be adapted to carry out four measurements sequentially, in any order: a first measurement in which it measures the charges accumulated on one of the two electrodes 21 , said first electrode, after imposing the electrical potential E on said first electrode for a predetermined time during / that the second electrode is connected to ground, 1 - "a second" measure "during” "which” measure the electric charges accumulated on the other electrode 21, called the second electrode, after having imposed the electric potential E on said second el ectrode for a predetermined period while the first electrode is connected to ground, a third measure in which it measures the electrical charges accumulated on the first electrode 21 after having imposed the potential E on the two electrodes for a predetermined period, - and a fourth measurement during which it measures the electrical charges accumulated on the second electrode 21 after having imposed the potential E on the two electrodes for a predetermined period (the predetermined durations during which the electrical potential E is imposed on one or two of the electrode
- control device 19 could for example be of the type of that shown diagrammatically in FIG. 4.
- This control device 19 can comprise for example an internal microcontroller or microprocessor ⁇ C 35 which controls, for each electrode 21: - a switching device 31 (transistor or other) adapted to connect the screen 22 either to ground or to the electrode 21, a switching device 32 adapted to connect the electrode 21 either to ground, or to a potential èrêctrlqué " predetermined V, "'" ⁇ and a switching device 33 adapted to connect or not the electrode 21 to an electrical charge counting device 34 (CNT) which can be read by the microcontroller 35.
- the capacitive sensor 20 may be different from that shown in FIGS. 2 and 3.
- the sensor 20 can comprise several conductive screens 22a, 22b, for example two conductive screens, which would be electrically isolated from each other and connected for example each to the shield 27 of one electrical conductors 26 electrodes, via electrical connections 29.
- each electrode 21 has a length distributed substantially equally over the two conductive screens 22a, 22b as symmetrically as possible between these two screens.
- each shield 27 can always be equal to the potential of the electrical conductor 26 correspondent.
- the electrodes 21, 22 can be arranged other than in a rounded spiral spiral: for example, the electrodes 21 can also be arranged in a spiral at right angles which can for example form an elongated strip having a relatively small width e of for example between 2 and 5 cm and a length L of for example between 10 and 30 cm, the length L of the sensor 20 can be arranged either in the direction of the
- the capacitive sensor 20 could comprise a single electrode 21, arranged as in the previous embodiments on ''" the screen 22, being """"” electrically isolated “ from this " screen.
- the screen 22 is connected to the control device 17 so as to be set to the same electrical potential (not zero) as the electrode 21 during the measurement periods when electrical charges accumulate on said electrode, and to ground during the periods reading where the control device reads the electric charge accumulated on the electrode 21 during the reading period.
- the external medium in particular the user 8, when it is present
- the screen 22 is a conductive sheet which has a zigzag shape according to the shape of the conductive electrode.
- the screen 22 is connected to the control circuit 19 by a separate wire 30 including the aforementioned connection conductor 29, which connection conductor 29 can be connected to the circuit 19 as in the other modes. of embodiment (this arrangement would also be possible in the other embodiments of the invention).
- seat 2 has several capacitive sensors 20, these sensors may be of different types, and not all of them be produced in accordance with the present invention.
- the detection system formed by at least one of the aforementioned capacitive sensors and the control device, could be used in other applications than in a vehicle seat.
- this detection system could be integrated into a vehicle dashboard, a vehicle roof, a steering wheel, a door, etc.
- the electrode (s) 21 of the capacitive sensor may not be placed against the conductive screen 22.
- the screen 22 could be " 15 ""”” arranged “ a few " centimeters (for example " 3 to 8 cm) below the electrode (s) 21, said screen then being separated from the electrode (s) for example by a thickness of synthetic foam belonging to the padding of the seat.
- the conductive screen 20 could possibly be formed by the elastic suspension ply of the corresponding part of the seat.
- the screen 22 could be constituted by any conductive member (conductive sheet, grid
- conductive, conductive mesh, conductive fabric, conductive foam, etc. which has a certain surface generally greater than the surface occupied by the electrode (s) 21, 0 - which covers substantially all of the electrode (s) 21 of the capacitive sensor opposite the detection zone 7, and which is electrically isolated from the electrode (s) 21.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Seats For Vehicles (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Air Bags (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/541,720 US20060033507A1 (en) | 2003-01-10 | 2004-01-09 | Capacitive detection system, particularly for a motor vehicle interior |
| JP2005518434A JP2006518033A (ja) | 2003-01-10 | 2004-01-09 | 特に車内用の容量検出システム |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR03/00253 | 2003-01-10 | ||
| FR0300253A FR2849918B1 (fr) | 2003-01-10 | 2003-01-10 | Systeme de detection capacitif, notamment pour interieur de vehicule automobile. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2004069590A2 true WO2004069590A2 (fr) | 2004-08-19 |
| WO2004069590A3 WO2004069590A3 (fr) | 2004-12-29 |
Family
ID=32524826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2004/000038 Ceased WO2004069590A2 (fr) | 2003-01-10 | 2004-01-09 | Systeme de detection capacitif, notamment pour interieur de vehicule automobile |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20060033507A1 (fr) |
| JP (1) | JP2006518033A (fr) |
| FR (1) | FR2849918B1 (fr) |
| WO (1) | WO2004069590A2 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009502616A (ja) * | 2005-07-28 | 2009-01-29 | ヒタチ、コンピュータ、プロダクツ、(ユーロプ)、ソシエテ、アノニム | 自動車座席占有者の形態識別用静電容量センサ |
| LU92732B1 (en) * | 2015-06-05 | 2016-12-06 | Iee Int Electronics & Eng Sa | Capacitive detection device and system for use in vehicle interior |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100802751B1 (ko) * | 2005-11-01 | 2008-02-12 | 현대자동차주식회사 | 유동전위 측정용 센서 |
| DE602006010671D1 (de) | 2006-05-17 | 2010-01-07 | Hitachi Comp Products Europ S | Verfahren zur Ermittlung der Morphologie eines Insassen in einem Fahrzeugsitz mit kapazitiven Sensoren |
| US7679378B2 (en) * | 2007-08-03 | 2010-03-16 | Delphi Technologies, Inc. | Dual function capacitive sensor for seat occupant detection |
| KR101210691B1 (ko) * | 2010-03-12 | 2012-12-10 | 현대자동차주식회사 | 자동차 |
| DE102015113663A1 (de) * | 2015-02-11 | 2016-08-11 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Sensoranordnung für ein Kraftfahrzeug |
| CN108195490B (zh) * | 2018-01-31 | 2019-10-11 | 北京他山科技有限公司 | 具有分时、分区域屏蔽功能的传感器、电子皮肤和机器人 |
| WO2019187516A1 (fr) * | 2018-03-30 | 2019-10-03 | パナソニックIpマネジメント株式会社 | Dispositif de détection de capacité |
| CN111771110B (zh) * | 2018-03-30 | 2022-06-24 | 松下知识产权经营株式会社 | 静电电容检测装置 |
| DE102018127019B4 (de) * | 2018-10-30 | 2024-01-18 | Airbus Operations Gmbh | Elektrisches Verbindungssystem für einen Sitz |
| FR3106094B1 (fr) * | 2020-01-15 | 2022-10-07 | Faurecia Sieges Dautomobile | Siege de vehicule avec systeme de surveillance |
| US12228467B2 (en) * | 2020-09-30 | 2025-02-18 | Joyson Safety Systems Acquisition Llc | Force sensing seat belt sensor assembly |
| FR3116900B1 (fr) * | 2020-11-27 | 2023-01-13 | Faurecia Sieges Dautomobile | Procédé de détermination de l’état d’occupation d’un siège et système de détermination correspondant |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5337353A (en) * | 1992-04-01 | 1994-08-09 | At&T Bell Laboratories | Capacitive proximity sensors |
| US6310407B1 (en) * | 1998-07-13 | 2001-10-30 | Nec Corporation | Passenger detecting system and air bag system using the same |
| FR2785046B1 (fr) * | 1998-10-23 | 2001-01-26 | Claude Launay | Dispositif de mesure reposant sur la mesure indirecte de la permittivite |
| US6828806B1 (en) * | 1999-07-22 | 2004-12-07 | Sumitomo Metal Industries, Ltd. | Electrostatic capacitance sensor, electrostatic capacitance sensor component, object mounting body and object mounting apparatus |
| FR2813054B1 (fr) * | 2000-08-21 | 2002-11-15 | Faure Bertrand Equipements Sa | Systeme pour vehicule, comportant un dispositif de commande adapte pour faire fonctionner un actionneur selectivement en fonction d'une valeur mesuree par un dispositif de mesure dispose dans un siege |
-
2003
- 2003-01-10 FR FR0300253A patent/FR2849918B1/fr not_active Expired - Fee Related
-
2004
- 2004-01-09 US US10/541,720 patent/US20060033507A1/en not_active Abandoned
- 2004-01-09 WO PCT/FR2004/000038 patent/WO2004069590A2/fr not_active Ceased
- 2004-01-09 JP JP2005518434A patent/JP2006518033A/ja active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009502616A (ja) * | 2005-07-28 | 2009-01-29 | ヒタチ、コンピュータ、プロダクツ、(ユーロプ)、ソシエテ、アノニム | 自動車座席占有者の形態識別用静電容量センサ |
| LU92732B1 (en) * | 2015-06-05 | 2016-12-06 | Iee Int Electronics & Eng Sa | Capacitive detection device and system for use in vehicle interior |
| WO2016193354A1 (fr) * | 2015-06-05 | 2016-12-08 | Iee International Electronics & Engineering S.A. | Dispositif et système de détection capacitifs destinés à être utilisés à l'intérieur d'un véhicule |
| US10479304B2 (en) | 2015-06-05 | 2019-11-19 | Iee International Electronics & Engineering S.A. | Capacitive detection device and system for use in vehicle interior |
Also Published As
| Publication number | Publication date |
|---|---|
| US20060033507A1 (en) | 2006-02-16 |
| FR2849918A1 (fr) | 2004-07-16 |
| JP2006518033A (ja) | 2006-08-03 |
| FR2849918B1 (fr) | 2005-06-17 |
| WO2004069590A3 (fr) | 2004-12-29 |
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