EP0256039A1 - Dynamischer drucksensor für fahrzeugreifen - Google Patents
Dynamischer drucksensor für fahrzeugreifenInfo
- Publication number
- EP0256039A1 EP0256039A1 EP19870900661 EP87900661A EP0256039A1 EP 0256039 A1 EP0256039 A1 EP 0256039A1 EP 19870900661 EP19870900661 EP 19870900661 EP 87900661 A EP87900661 A EP 87900661A EP 0256039 A1 EP0256039 A1 EP 0256039A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure sensor
- sensor according
- tire
- wall
- films
- 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.)
- Withdrawn
Links
- 230000010287 polarization Effects 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 8
- 239000002861 polymer material Substances 0.000 claims 1
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000005452 bending Methods 0.000 description 16
- 230000005540 biological transmission Effects 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/06—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/041—Means for supplying power to the signal- transmitting means on the wheel
- B60C23/0411—Piezoelectric generators
Definitions
- the invention relates to a dynamic pressure sensor for tires. It is more particularly applicable to automobile tires.
- the proposed sensor allows dynamic pressure measurement for tires, and more precisely detection of under inflation.
- This sensor has the advantage of being insensitive to normal stresses and temperature changes, and optimized for the detection of bending stresses.
- the invention therefore provides a solution to meet these needs.
- the invention therefore relates to a dynamic pressure sensor for a tire comprising a wheel provided with an inflatable tire having a deformable wall, characterized in that it comprises two piezoelectric films of opposite polarizations, mechanically integral with one another and associated with the tire wall.
- the measurement of the bending of a relatively flexible envelope is greatly facilitated by the use of a sensor which is itself flexible and sufficiently thin to adhere to the internal face of the tire, or, in the case of a tire with a chamber, for sliding between tire and chamber without excessive deformation of the latter.
- the measurement of the bending of the tire sidewall must be carried out in a very severe environment. This measurement must indeed be independent of the temperature conditions (typically - 0 to 80 ° CeIsius) and as little as possible dependent on the normal stresses applied to the tire.
- the proposed sensor therefore comprises a bimorph of piezoelectric films, that is to say of two films integral with opposite polarizations.
- This bimorph a few centimeters wide, a few hundred microns thick, is stuck inside the tire, from one edge to the other.
- the useful zones of this bimorph are those in contact with the sides; the length of this bimorph can be limited to one side.
- a bimorph can also be glued on each side, which brings the possibility new differential bending measurement.
- FIG. 1 there is therefore shown in sectional view a tire consisting of an envelope 1 mounted on a rigid rim 2. This tire is inflated by means of a valve.
- a bimor ⁇ phe 3 has been stuck on the inside wall of the envelope 1 comprising two piezoelectric films 32, 33 joined to one another and whose common face has been represented by a dotted line in FIG. 1.
- the bimorph is placed on the inner wall of the tire so as to connect the two ends 10 and 11 of the casing 1 as visible in section view.
- the ends 30 and 31 located at the ends 10 and 11 therefore do not support bending stress while the bimorph portions located at the sides 1 and l 'of the envelope undergo bending stresses due to the flattening of the tire.
- FIG 2 there is shown a sectional view of a pneuma ⁇ tick in which the sensor of the invention comprises two bimorphs 3 and placed there on the sidewalls 1 and the of the tire with their end 30 and 31 placed at level ends 10 and 11 of the rim.
- This arrangement allows, as indicated above, differential bending measurements.
- FIG. 3 there is shown a bimorph 3 having two lamellae or films 32 and 33 of piezoelectric material and joined to one another.
- One end 35 of the bimorph 3 is immobilized in a jaw 7 in the same way as in FIGS. 1 and 2, the ends 30 and 31 are integral with the ends 10 and 11 of the tire casing at the level of the rim 2 .
- the 3 ⁇ end of the bimorph is free and supports a bending force F which tends to bend the bimorph to bring it into the position indicated in dotted lines.
- the length of the bimorph is L.
- the thicknesses of the two films are identical and the total thickness of the bimorph is h.
- piezoelectric coefficient ⁇ - ⁇ > d ,. , where d-, is the transverse piezoelectric coefficient intrinsic to the piezoelectric material.
- the electrical power supplied is:
- the piezoelectric polymer bimorphs are produced industrially, using for example the process which is the subject of patent 80 20213 filed on September 19, 1980 and published under No. 2 4 0 877.
- the sensor is cut to the length adapted to the tire, bending must occur perpendicular to the machine axis (axis along which the polymer was stretched during its manufacture).
- the bimorph strips are generally metallized by vacuum deposition of aluminum; the contacts are made either by bonding using a conductive adhesive, or by pressure.
- the bimorph must be mechanically protected, which is simply achieved by gluing adhesive tapes on both sides; one of the tapes can be double-sided adhesive, so as to ensure bonding inside the tire.
- the transmission of the indication of under inflation is transmitted to the driver without rotating contact.
- Optical or ultrasonic transmission will be provided using devices known in the art. It is also possible to carry out transmission by electromagnetic waves using a device as described below. Information can only be transmitted in the event of critical under inflation, that is to say a threshold must be placed.
- the best device consists in using, as shown in FIG. 4, a transmission circuit comprising a neon lamp 50 connected by a load 51 to the connections 5 and 6 of the bimorph 3. This circuit combines both the function threshold, and the shaping of the pulses.
- the charging circuit can be an HF oscillating circuit 52 coupled to an antenna 53.
- the load circuit can be an oscillating circuit, the choke 52 of which is made up of a loop secured to the wheel axle.
- the signals transmitted by the antenna 53 are received by a remote reception circuit, not shown in the figures.
- the charging circuit can also be a rotating loop 54 secured to the pneumatic wheel, while a fixed loop and a receiving circuit, not shown, are secured to the axis of the wheel.
- the charging circuit can be a diode bridge 56 supplying an HF or BF transmitter referenced 57 in the figure and emitting either via an antenna 53, or via a mobile loop 54 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8600317A FR2592954B1 (fr) | 1986-01-10 | 1986-01-10 | Capteur de pression dynamique pour pneumatique. |
FR8600317 | 1986-01-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0256039A1 true EP0256039A1 (de) | 1988-02-24 |
Family
ID=9331000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870900661 Withdrawn EP0256039A1 (de) | 1986-01-10 | 1987-01-09 | Dynamischer drucksensor für fahrzeugreifen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0256039A1 (de) |
FR (1) | FR2592954B1 (de) |
WO (1) | WO1987004124A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1223919B (it) * | 1988-11-18 | 1990-09-29 | Leonardo Fioravanti | Procedimento e sistema per la rilevazione delle impronte di appoggio dei pneumatici di un autoveicolo particolarmente per l'ottimizzazione automatica del comportamento del l'autoveicolo |
DE4329591C2 (de) * | 1993-09-02 | 2002-05-08 | Bayerische Motoren Werke Ag | Vorrichtung zur Überwachung des Luftdrucks eines Reifens bei Kraftfahrzeugen |
SE0300127D0 (sv) | 2003-01-17 | 2003-01-17 | Imego Ab | Indicator arrangement |
JP4503010B2 (ja) * | 2003-01-17 | 2010-07-14 | ヴァーサセンサ・エイビイ | センサ装置 |
CN105252970B (zh) * | 2015-09-28 | 2017-03-01 | 江苏理工学院 | 压电胎压轮速监测系统及监测方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE7506969L (sv) * | 1974-06-25 | 1975-12-29 | Dunlop Ltd | Anordning for varning om punktering eller tomning av pneumatiska deck |
US4237728A (en) * | 1979-04-30 | 1980-12-09 | Gould Inc. | Low tire warning system |
-
1986
- 1986-01-10 FR FR8600317A patent/FR2592954B1/fr not_active Expired
-
1987
- 1987-01-09 WO PCT/FR1987/000006 patent/WO1987004124A1/fr unknown
- 1987-01-09 EP EP19870900661 patent/EP0256039A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8704124A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1987004124A1 (fr) | 1987-07-16 |
FR2592954A1 (fr) | 1987-07-17 |
FR2592954B1 (fr) | 1988-03-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE GB IT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19871013 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MICHERON, FRANCOIS |