EP0256039A1 - Dynamischer drucksensor für fahrzeugreifen - Google Patents

Dynamischer drucksensor für fahrzeugreifen

Info

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Withdrawn
Application number
EP19870900661
Other languages
English (en)
French (fr)
Inventor
François Micheron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0256039A1 publication Critical patent/EP0256039A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00Devices 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
    • B60C23/06Signalling 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00Devices 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
    • B60C23/02Signalling devices actuated by tyre pressure
    • B60C23/04Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408Signalling 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
    • B60C23/041Means for supplying power to the signal- transmitting means on the wheel
    • B60C23/0411Piezoelectric 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)
EP19870900661 1986-01-10 1987-01-09 Dynamischer drucksensor für fahrzeugreifen Withdrawn EP0256039A1 (de)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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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Inventor name: MICHERON, FRANCOIS