DE3018246A1 - Analogue pneumatic tyre press measurement - using magnets and coil, requiring no electrical energy input, and utilising inductive coupling effect - Google Patents

Analogue pneumatic tyre press measurement - using magnets and coil, requiring no electrical energy input, and utilising inductive coupling effect

Info

Publication number
DE3018246A1
DE3018246A1 DE19803018246 DE3018246A DE3018246A1 DE 3018246 A1 DE3018246 A1 DE 3018246A1 DE 19803018246 DE19803018246 DE 19803018246 DE 3018246 A DE3018246 A DE 3018246A DE 3018246 A1 DE3018246 A1 DE 3018246A1
Authority
DE
Germany
Prior art keywords
magnets
pressure
analog
magnet
induction coil
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Withdrawn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
DE19803018246
Other languages
German (de)
Inventor
Manfred Dipl.-Ing. 7527 Kraichtal Rothley
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19803018246 priority Critical patent/DE3018246A1/en
Publication of DE3018246A1 publication Critical patent/DE3018246A1/en
Withdrawn legal-status Critical Current

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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
    • B60C23/02—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
    • B60C23/0422—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 characterised by the type of signal transmission means
    • B60C23/0425—Means comprising permanent magnets, e.g. Hall-effect or Reed-switches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/007—Transmitting or indicating the displacement of flexible diaphragms using variations in inductance

Abstract

An analogue tyre press. measurement instrument for vehicles with pneumatic tyres has a magnetic device for transfer of the measurement value from the tyre to the vehicle. No transfer of electrical energy from the vehicle to the wheel is necessary. A press. measurement cell (2) subjected to the press. of air in the tyre (5) carries a magnet (6) with press. dependent position. A reference magnet is fixed w.r.t. the wheel rim with which it rotates. A fixed induction coil (8) senses the passage of both magnets. The direction of polarisation of the magnets and the axis of the induction coil are radial to the axis of rotation of the vehicle wheel. The quotient is formed of the amplitudes of the pulses induced in the coil by the two magnets.

Description

Analoger ReifendruckmesserAnalog tire pressure gauge

Die Erfindung betrifft einen analogen Reifendruckmesser für luftbereifte Fahrzeuge mit einer magnetischen übertragungseinrichtung für den Meßwert vom Reifen auf das Fahrzeug.The invention relates to an analog tire pressure gauge for pneumatic tires Vehicles with a magnetic transmission device for the measured value from the tire on the vehicle.

Aus den Unterlagen des am 5.7.1979 eingetragenen luxemburgischen Patents 80 857 ist eine Einrichtung zur Überwachung des Luftdruckes im Reifen eines Fahrzeugrades bekannt, bei welcher die Übertragungseinrichtung aus einer auf dem Fahrzeugrad angeordneten Magnetspule und einer auf dem Fahrzeug befestigten Induktionsschleife besteht, die dem Magnetfeld der an ihr Vorbeilaufenden Magnetspule ausgesetzt ist. Dort bildet die Magnetspule zusammen mit einem Kondensator, dessen Kapazität sich in Abhängigkeit vom Reifenluftdruck ändert, einen elektrischen Schwingkreis, dessen Resonanzfrequenz sich in Abhängigkeit von dem im Reifen herrschenden LuCtdruck verändert und beim Vorbeilaufen der Magnetspule in der Induktionsschleife ein der Resonanzfrequenz entsprechendes Wechselspannungssignal induziert.From the documents of the Luxembourg patent registered on July 5, 1979 80 857 is a device for monitoring the air pressure in the tire of a vehicle wheel known, in which the transmission device consists of a arranged on the vehicle wheel Magnetic coil and an induction loop attached to the vehicle, which is exposed to the magnetic field of the magnetic coil passing by it. There educates the magnetic coil together with a capacitor, the capacitance of which is dependent on changes from the tire air pressure, an electrical oscillating circuit whose resonance frequency changes depending on the air pressure prevailing in the tire and at Passing the magnetic coil in the induction loop at the resonance frequency corresponding AC voltage signal induced.

Der Erfindung liegt die Aufgabe zugrunde, einen analogen Reifendruckmesser zu schaffen, bei welchem keine elektrische Energieübertragung vom Fahrzeug auf das Fahrzeugrad notwendig ist. Hierzu sind die im kennzeichnenden Teil des Hauptanspruchs angegebenen Maßnahmen vorgesehen.The invention is based on the object of an analog tire pressure gauge to create, in which no electrical energy transfer from the vehicle to the Vehicle wheel is necessary. These are in the characterizing part of the main claim specified measures are provided.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus dem nachstehend beschriebenen Ausführungsbeispiel, das in der Zeichnung dargestellt ist, in Verbindung mit den Unteransprüchen.Advantageous developments of the invention emerge from the following described embodiment, which is shown in the drawing, in connection with the subclaims.

In Fig. 1 ist ausschnittsweise ein Fahrzeugrad mit einem erfindungsgemäßen Reifendruckmesser im Schnitt und in Fig. 2 eine elektrische Auswerteeinrichtung in ihrem Blockschaltbild dargestellt.In Fig. 1 is a detail of a vehicle wheel with an inventive Tire pressure gauge in section and in Fig. 2 an electrical evaluation device shown in their block diagram.

Auf der Felge 1 des im übrigen nicht näher dargestellten Fahrzeugrades sitzt eine Druckmeßdose 2 mit einer gewellten Edelstahlmembran, auf welche über eine Bohrung 4 der im Inneren des bei 5 angedeuteten Reifens herrschende Reifendruck einwirkt. Entsprechend diesem Druck wird die Membran 3 in radialer Richtung des Rades ausgelenkt. Im Zentrum der Membran 3 sitzt ein kleiner zylinderförmiger Permanentmagnet 6, der im folgenden als Meßmagnet bezeichnet wird, weil er sich unter dem Einfluß des Reifendruckes in radialer Richtung bezogen auf die Radachse druckabhängig verstellt. In diesem Meßmagnet 6 steht ein mit dem Fahrzeug fest verbundene Induktionsspule 8 gegenüber. In dieser wird bei jedem Vorbeilauf des Meßmagneten 6 eine vom Reifendruck und von der Radgeschwindigkeit abhängige Spannung induziert.On the rim 1 of the otherwise not shown vehicle wheel sits a pressure cell 2 with a corrugated stainless steel membrane, on which over a bore 4 of the tire pressure prevailing inside the tire indicated at 5 acts. According to this pressure, the membrane 3 is in the radial direction of the Wheel deflected. In the center of the membrane 3 sits a small, cylindrical permanent magnet 6, which is referred to below as the measuring magnet because it is under the influence of the tire pressure in the radial direction relative to the wheel axle is adjusted as a function of pressure. In this measuring magnet 6 there is an induction coil firmly connected to the vehicle 8 opposite. In this, with each passage of the measuring magnet 6, one of the tire pressure and induced voltage dependent on the wheel speed.

Als Referenzsystem ist ein zweiter, im folgenden als Referenzmagnet bezeichneter Dauermagnet 10 vorgesehen.A second magnet, hereinafter referred to as a reference magnet, is used as the reference system designated permanent magnet 10 is provided.

Dieser ist ebenfalls, bezogen auf die Radachse in radialer Richtung magnetisiert, seine Polarisation ist jedoch zum Meßmagnet 6 entgegengesetzt gerichtet. Bei jeder Radumdrehung werden die Flüsse der beiden Magneten 6 und 10 abgetastet und erzeugen in der Induktionsspule 8 Spannungsimpulse, deren Amplitude proportional zur Umfangsgeschwindigkeit des Rades bzw. der Auslenkung der Druckmeßdose 2 ist. Diese Spannungsimpulse können mit der im folgenden näher beschriebenen Auswerteschaltung, die in Fig. 2 in ihrem Blockschaltbild dargestellt ist, in analoge Meßwerte umgewandelt werden.This is also in relation to the wheel axis in the radial direction magnetized, but its polarization is opposite to the measuring magnet 6. With each revolution of the wheel, the fluxes of the two magnets 6 and 10 are scanned and generate 8 voltage pulses in the induction coil, the amplitude of which is proportional to the circumferential speed of the wheel or the deflection of the pressure cell 2 is. These voltage pulses can be used with the evaluation circuit described in more detail below, which is shown in its block diagram in FIG. 2, converted into analog measured values will.

In Fig. 2 ist die bei 8 angedeutete Induktionsschleife 8 an ein Integrationsglied 12 zugeführt, das an seinem Ausgang ein von der Geschwindigkeit des Rades unabhängiges Signal liefert. Nachgeschaltete Präzisionsw gleichrichter 13 und 14 mit Analogspeichern 15 und 16 halten die Amplituden A der von dem Meßmagneten 8 gelieferten Impulse und die Amplituden B der von dem Referenzmagneten 10 gelieferten Impulse fest. Anschließend werden in einem Quotientenmeßwerk 15 die Quotienten aus beiden Amplituden gebildet und einem Anzeigegerät 18 zugeführt, welches den jeweiligen Analogwert des Reifendruckes wiedergibt.In FIG. 2, the induction loop 8 indicated at 8 is connected to an integration element 12 is supplied, which is independent of the speed of the wheel at its output Signal delivers. Downstream precision rectifiers 13 and 14 with analog memories 15 and 16 hold the amplitudes A of the pulses supplied by the measuring magnet 8 and the amplitudes B of the pulses supplied by the reference magnet 10 are fixed. Afterward the quotients of the two amplitudes are formed in a quotient measuring mechanism 15 and a display device 18 which shows the respective analog value of the tire pressure reproduces.

Bei der in Fig. 1 dargestellten Anordnung ist die St-ahlmembran 3 voll den Radialbeschleunigungskräften ausgesetzt, welche einen drehzahlabhängigen Fehler verursachen. Dieser bleibt jedoch klein und beträgt bei 100 km/Std ca. 1 des angezeigten Meßwertes bei einem normalen Reifendruck von 1 - 2 atü.In the arrangement shown in FIG. 1, the steel membrane is 3 fully exposed to the radial acceleration forces, which have a speed-dependent Cause errors. However, this remains small and is approx. 1 at 100 km / h of the displayed measured value at a normal tire pressure of 1 - 2 atm.

Der drehzahlabhängige Fehler kann auf der Grundlage der in der Auswerteeinrichtung anfallenden Drehzahlinformation leicht kompensiert werden.The speed-dependent error can be based on the in the evaluation device speed information can be easily compensated.

Der besondere Vorteil des erfindungsgemäßen Reifendruckmessers besteht nicht nur in seinem geringen Aufwand, sondern auch darin, daß keine Energieübertragung zum Rad erforderlich ist. Außerdem ergibt sich eine größere Variation des Meßsignals; eine noch größere Variation ergibt sich, wenn anstelle einer gewellten Membran 3 in der Druckmeßdose 2 ein Wellrohrbalg verwendet wird.There is a particular advantage of the tire pressure gauge according to the invention not only in its low cost, but also in the fact that no energy transfer to the bike is required. In addition, there is a greater variation in the measurement signal; an even greater variation results if instead of a corrugated membrane 3 a corrugated tube bellows is used in the pressure cell 2.

LeerseiteBlank page

Claims (4)

Ansprüche X Analoger Reifendruckmesser für luftbereifte Fahrzuge, mit einer magnetischen Übertragungseinrichtung für den Meßwert vom Reifen auf das Fahrzeug, dadurch gekennzeichnet, daß eine vom Luftdruck des Reifens (5) beaufschlagte Druckmeßdose (2) vorgesehen ist, die einen druckabhängig verstellbaren Meßmagneten (6) trägt, und daß ein relativ zur Felge feststehender, mit dieser umlaufender Referenzmagnet (10) vorgesehen ist und daß beiden Magneten eine feststehende Induktionsspule (8) zugeordnet ist, die beim Vorbeilauf der Magnete von diesen induziert wird. Claims X Analog tire pressure gauge for vehicles with pneumatic tires, with a magnetic transfer device for the measured value from the tire to the Vehicle, characterized in that one is acted upon by the air pressure of the tire (5) Pressure cell (2) is provided which has a pressure-dependent adjustable measuring magnet (6) carries, and that a relative to the rim fixed, with this revolving reference magnet (10) is provided and that both magnets have a fixed induction coil (8) is assigned, which is induced by the magnets as they pass. 2. Druckmesser nach Anspruch 1, dadurch gekennzeichnet, daß die Polarisationrichtung der beiden Magnete (6, 10) und die Achsrichtung der Induktionsspule (8) radial zur Drehachse des Fahrzeugrades gerichtet sind. 2. Pressure meter according to claim 1, characterized in that the polarization direction of the two magnets (6, 10) and the axial direction of the induction coil (8) radial to Axis of rotation of the vehicle wheel are directed. 3. Druckmesser nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die feststehende Induktionsspule (8) an ein Integrationsglied (12) angeschlossen ist, das mit einem seiner beiden Ausgänge über einen ersten Präzisionsgleichrichter (13) auf einen Analogspeicher (15) für die Amplituden (A) der vom Meßmagneten erzeugten Spannungsimpulse und dessen zweiter Ausgang über einen zweiten Präzisionsgleichrichter (14) auf einen zweiten Analogspeicher (16) für die Amplituden (B) der vom Referenzmagneten (10) erzeugten Spannungsimpulse angeschlossen ist und daß beide Analogspeicher auf ein Quotientenmeßwerk (17( arbeiten, an welches ein vorzugsweise -optisches Anzeigegerät (18) angeschlossen ist.3. Pressure meter according to claim 1 or 2, characterized in that the fixed induction coil (8) is connected to an integration member (12) is that with one of its two outputs via a first precision rectifier (13) to an analog memory (15) for the amplitudes (A) generated by the measuring magnet Voltage pulses and its second output via a second precision rectifier (14) to a second analog memory (16) for the amplitudes (B) of the reference magnet (10) generated voltage pulses is connected and that both analog memories on a quotient measuring unit (17 (work, on which a preferably -optical display device (18) is connected. 4. Druckmesser nach Anspruch 1, dadurch gekennzeichnet, daß die Quotientenbildung rein elektrisch mittels Dividierer durchgeführt wird, so daß jedes Analoganzeigegerät beliebiger Bauart verwendet werden kann.4. Pressure meter according to claim 1, characterized in that the quotient formation is carried out purely electrically by means of a divider, so that every analog display device any design can be used.
DE19803018246 1980-05-13 1980-05-13 Analogue pneumatic tyre press measurement - using magnets and coil, requiring no electrical energy input, and utilising inductive coupling effect Withdrawn DE3018246A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803018246 DE3018246A1 (en) 1980-05-13 1980-05-13 Analogue pneumatic tyre press measurement - using magnets and coil, requiring no electrical energy input, and utilising inductive coupling effect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803018246 DE3018246A1 (en) 1980-05-13 1980-05-13 Analogue pneumatic tyre press measurement - using magnets and coil, requiring no electrical energy input, and utilising inductive coupling effect

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DE3018246A1 true DE3018246A1 (en) 1981-11-19

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3208869A1 (en) * 1982-03-11 1983-09-22 Bayerische Motoren Werke AG, 8000 München Analog tyre pressure signal generator for motor vehicles
DE3209661A1 (en) * 1982-03-17 1983-09-29 Heinz Dieter Dipl.-Ing.(FH) 6050 Offenbach Sonnleitner Measuring instrument for measuring physical variables, for example air pressure
DE3242291A1 (en) * 1982-11-16 1984-05-17 Moto Meter Ag, 7250 Leonberg Device for measuring the tyre pressure in the pneumatic tyres of vehicles while driving
WO1988001732A1 (en) * 1986-09-02 1988-03-10 Tyren Carl Device for measuring without contact the pressure of a gas enclosed by a body, e.g. the air pressure in a vehicle tyre
WO1989010274A1 (en) * 1988-04-23 1989-11-02 Robert Bosch Gmbh Tyre pressure sensor for motor vehicles
EP0361005A1 (en) * 1988-08-12 1990-04-04 Alligator Ventilfabrik GmbH Monitoring device for the air pressure of a vehicle tyre
DE4006546A1 (en) * 1990-03-02 1991-09-05 Martin Christ Gefriertrocknung Contactless measurement arrangement for moving object parameters - has electrical generator, measurement transducer and transmitter for contactless transfer of measurement values to stationary receiver
DE4016207A1 (en) * 1990-05-19 1991-11-21 Werner Seider Vehicle tyre air pressure measurement arrangement - contains measurement piston in non-magnetic measurement tube with e.g. inductive sensor
DE4400467A1 (en) * 1994-01-11 1995-07-20 Johann Binder Arrangement for monitoring tyre pressure of vehicle wheels or tyres
DE19630015A1 (en) * 1996-07-25 1998-01-29 Daimler Benz Ag Contact free electrical measuring system for tyre pressure especially for moving motor vehicle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3208869A1 (en) * 1982-03-11 1983-09-22 Bayerische Motoren Werke AG, 8000 München Analog tyre pressure signal generator for motor vehicles
DE3209661A1 (en) * 1982-03-17 1983-09-29 Heinz Dieter Dipl.-Ing.(FH) 6050 Offenbach Sonnleitner Measuring instrument for measuring physical variables, for example air pressure
DE3242291A1 (en) * 1982-11-16 1984-05-17 Moto Meter Ag, 7250 Leonberg Device for measuring the tyre pressure in the pneumatic tyres of vehicles while driving
WO1988001732A1 (en) * 1986-09-02 1988-03-10 Tyren Carl Device for measuring without contact the pressure of a gas enclosed by a body, e.g. the air pressure in a vehicle tyre
WO1989010274A1 (en) * 1988-04-23 1989-11-02 Robert Bosch Gmbh Tyre pressure sensor for motor vehicles
EP0361005A1 (en) * 1988-08-12 1990-04-04 Alligator Ventilfabrik GmbH Monitoring device for the air pressure of a vehicle tyre
DE4006546A1 (en) * 1990-03-02 1991-09-05 Martin Christ Gefriertrocknung Contactless measurement arrangement for moving object parameters - has electrical generator, measurement transducer and transmitter for contactless transfer of measurement values to stationary receiver
DE4016207A1 (en) * 1990-05-19 1991-11-21 Werner Seider Vehicle tyre air pressure measurement arrangement - contains measurement piston in non-magnetic measurement tube with e.g. inductive sensor
DE4400467A1 (en) * 1994-01-11 1995-07-20 Johann Binder Arrangement for monitoring tyre pressure of vehicle wheels or tyres
DE19630015A1 (en) * 1996-07-25 1998-01-29 Daimler Benz Ag Contact free electrical measuring system for tyre pressure especially for moving motor vehicle

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