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DE2653167A1 - Transmission of state of motor vehicle tyres, wheels and brakes - using two coupling coils on vehicle belonging to oscillator circuit tuned to same frequency as coupling circuit mounted on wheel rim - Google Patents

Transmission of state of motor vehicle tyres, wheels and brakes - using two coupling coils on vehicle belonging to oscillator circuit tuned to same frequency as coupling circuit mounted on wheel rim

Info

Publication number
DE2653167A1
DE2653167A1 DE19762653167 DE2653167A DE2653167A1 DE 2653167 A1 DE2653167 A1 DE 2653167A1 DE 19762653167 DE19762653167 DE 19762653167 DE 2653167 A DE2653167 A DE 2653167A DE 2653167 A1 DE2653167 A1 DE 2653167A1
Authority
DE
Germany
Prior art keywords
coupling
frequency
wheels
circuit
wheel
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Withdrawn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
DE19762653167
Other languages
German (de)
Inventor
Kurt Fritze
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.)
STERN ELEKTRONIK GmbH
Original Assignee
STERN ELEKTRONIK 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
Priority claimed from DE19752523488 external-priority patent/DE2523488C3/en
Application filed by STERN ELEKTRONIK GmbH filed Critical STERN ELEKTRONIK GmbH
Priority to DE19762653167 priority Critical patent/DE2653167A1/en
Publication of DE2653167A1 publication Critical patent/DE2653167A1/en
Withdrawn legal-status Critical Current

Links

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
    • B60C23/0427—Near field transmission with inductive or capacitive coupling means
    • B60C23/0428—Near field transmission with inductive or capacitive coupling means using passive wheel mounted resonance circuits
    • 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
    • B60C23/0427—Near field transmission with inductive or capacitive coupling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F16D66/021—Apparatus for indicating wear using electrical detection or indication means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D2066/001—Temperature

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

The transmission arrangement conveys the state of motor vehicle tyres, wheels and brakes without using wires. Two coupling coils are mounted on the relatively stationary part of the vehicle and near the wheel's inner side, and belong to an oscillator circuit. This circuit is tuned to the same frequency as the coupling oscillating circuit mounted pref. on the rim of the wheel, which can be switched on and off, or mistuned, depending on the state of the tyres and wheels. This frequency can in addition be wobbled. Thus, during each wheel revolution, the h.f. oscillation amplitude and/or frequency is briefly changed. This can be used to control an alarm system.

Description

Übertragungseinrichtung zur drahtlosen Ubertragungvon dem ZustandTransmission device for wireless transmission of the state

von Kraftfahrzeugreifen- und rädern und deren Bremseinrichtungen zugeordneten Signalen nach Patent P 2523 488.2 - 52 Das Elaupt-PatentP 2523488.2-52 behandelt die elektromagn. Koppelwirkung eines am Kfz-Rad- vorzugsweise in Felgenhornnähe - angebrachten Schwingungskreises, welcher von Zustandswertendes Reifens oder Rades ein- oder ausgeschaltet bzw. in seiner Abstimmfrequenz derart verändert wird, daß er dadurch bei jeder Radumdrehung die Übertragung von Hochfrequenzenergie von einem entsprechend nahebei am Fahrzeug-Chassis oder an der Achse angebrachten Oszillatorausgangs-auf eine;n gegenüber letzterem entkoppelten Empfänger-Elngangskreisintermittierend bewirken kann.associated with motor vehicle tires and wheels and their braking devices Signals according to patent P 2523 488.2 - 52 The Elaupt patent P 2523 488.2-52 deals with the electromagn. Coupling effect of one on the vehicle wheel - preferably near the rim flange - attached oscillation circuit, which of the condition values of the tire or wheel switched on or off or changed in its tuning frequency in such a way that He thereby the transmission of high frequency energy from one with each wheel revolution correspondingly close to the vehicle chassis or to the axle mounted oscillator output a; n intermittently effecting a receiver input circuit that is decoupled from the latter can.

Die bei intaktem Reifen und Rad im Empfänger periodisch auftretenden Hochfrequenzspannungen werden gleichgerichtet und in einer Speicher-oder Zähl- und Vergleichs-Schaltung so ausgewertet, daß bei etwaigem Ausbleiben der Impulse eine Alarmvorrichtung vor dem Fahrer ausgelöst wird.Those that occur periodically in the receiver when the tire and wheel are intact High frequency voltages are rectified and stored in a memory or counting and Comparison circuit evaluated so that with any Failing the impulses an alarm device is triggered in front of the driver.

Zur Vereinfachung und Verbilligung der Anlage wird erfindungsgemäß vorgeschlagen, letztere Impulsauswerteschaltung nicht mehr über die im Hauptpatent beschriebene getrennte Sender-/Empfãnger-Anordnung zu bedienen, sondern lediglich eine Oszillatorschaltung mit Schwingkreis- und Rückkopplungsspulenzu verwenden, und diese gegenseitig entkoppelt so anzuordnen, daß der mit dem Rad umlaufende vorzugsweise am Felgenhorn angebrachte Koppelschwingkreis intermittierend funktionsbestimmend in beide einkoppeln kann. Dabei ist es fur die Funktion der Auswerteschaltung gleichgültig, obdie Kopplung des Felgenschwingkreises je nach Phasenlage ein kurzfristiges Anschwingen oder vollständiges Aussetzen des Oszillators bewirkt, oder nur dessen Schwingamplitude und/oder eine Frequenzänderung beeinflußt. Wichtig für die einwandfreie Funktion der Anordnung ist auch bei dieser Schaltung, ebenso wie im Hauptpatent für die getrennte Sender-/Empfãnger-Anordnungbereits dargelegt, daß der Oszillator in seiner Arbeitsfrequenz mit relativ schnellem Durchlauf gewobbelt wird, weil während des kurzen Zeitraumes des Vorbeistreichens des Felgenkoppeikreises nur dadurch dessen optimaler Koppelungsgrad und eine ausreichende Rückwirkung auf die Oszillator-Schwingkreis-und Rückkopplungsspulen, die zur Erhöhung des Kopplungsgrades auch als Schwingkreise ausgebildet sein können, zur Funktionsbeeinflussung des Oszillators gewährleistet werden.To simplify and make the system cheaper, the invention proposed that the latter pulse evaluation circuit no longer has that in the main patent to use the separate transmitter / receiver arrangement described, but only to use an oscillator circuit with resonant circuit and feedback coils, and to arrange these mutually decoupled so that the one rotating with the wheel is preferred Coupling oscillating circuit attached to the rim flange intermittently determines the function can couple into both. It is irrelevant for the function of the evaluation circuit Whether the coupling of the rim resonance circuit, depending on the phase position, causes a short-term oscillation or complete suspension of the oscillator causes, or only its oscillation amplitude and / or affects a frequency change. Important for proper function the arrangement is also in this circuit, as in the main patent for the separate Transmitter / receiver arrangement already stated that the oscillator in its operating frequency is wobbled with a relatively fast run, because during the short period of time of sweeping past the rim head circle only thereby its optimal degree of coupling and sufficient feedback on the oscillator resonant circuit and feedback coils, which can also be designed as oscillating circuits to increase the degree of coupling, to influence the function of the oscillator.

Zur weiteren Vereinfachung, die allerdings eine Verringerung des erreichbaren Abstandes zwischen Rad und den eiFahrzeug-Cha fest angebrachten Koppelspulen ergeben kann, wird erfindungsgemäß vorgeschlagen, in der Oszillatorschaltung die Ruckkopplungintern mittels Phasendrehung zu erzeugen, so daß nur die Schwingkreisinduktivität übrig bleibt, die direkt oder indirekt somit die einzige Koppeispulepro Meßstelle darstellt.For further simplification, however, a reduction in the achievable Distance between the wheel and the vehicle cha firmly attached Coupling coils can result, is proposed according to the invention, in the oscillator circuit to generate the feedback internally by means of phase rotation, so that only the resonant circuit inductance remains, which is directly or indirectly thus the only Koppeispul per measuring point represents.

Bei jeder Radumdrehung erfolgt durch den am Felgenrand angebrachten und fallweise von den Zustandswerten des Rades oder Reifens beschalteten Koppelkreis ein Bochfrequenzenergieentzug des Oszillators, wodurch dessen Schwingamplitude und/oder -frequenz je nach Kopplungsgrad mehr oder weniger verändert wird, bis hin zum Abreißen der Schwingungen. Diese impulsartigen änderungen werden in der bereits beschriebenen Auswerteschaltung aufbereitet und zur Verriegelung des Warnsignals benutzt.Each time the wheel is rotated, the is attached to the rim edge and, in some cases, the coupling circuit connected by the state values of the wheel or tire a Bochfrequenzenergieabzug the oscillator, whereby its oscillation amplitude and / or -frequency is changed more or less depending on the degree of coupling, up to the point of tearing off of the vibrations. These impulsive changes are described in the above Evaluation circuit prepared and used to lock the warning signal.

Auch bei dieser Schaltungsordnung nach Art des bekannten dip-meters ist aber ein relativ hoher Kopplungsgrad zwischen Felgenkoppelkreis und Oszillatorschwingkreis wichtig, so daß letzterer auf bereits beschriebene Art und Weise in seiner Frequenz gewobbelt wird.Even with this circuit arrangement in the manner of the known dip meter but there is a relatively high degree of coupling between the rim coupling circuit and the oscillator circuit important, so that the frequency of the latter is already described is swept.

Für die praktische Ausführung der Anlage gemäß Hauptpatent bestehen zwei Möglichkeiten: 1. Unterbringung der gesamten Elektronik kombiniert mit Warnanzeige im Fahrerhaus, daran angeschlossen über Hochfrequenzkabel die einzelnen Koppelspulen nahe den Räderinnenseitenam Fahrzeug-Chassis, 2. Unterbringung nur der Warnanzeige-Elektronik im Fahrerhaus mit einer Verbindung über einen vieladrigen Kabelstrang zu der zentral am Fahrzeug angeordneten Sende-/Empfangselektronik, die wiederum mittels kürzeren Hochfrequenzleitungenmit den jeweiligen Koppelspulen in Radnabe verbunden ist.For the practical execution of the system according to the main patent exist two possibilities: 1. Accommodation of all electronics combined with warning display in the driver's cab, connected to the individual coupling coils via high-frequency cables near the inside of the wheels on the vehicle chassis, 2. Accommodation of only the warning display electronics in the cab with a connection via a multi-core cable harness to the central transmitter / receiver electronics arranged on the vehicle, which in turn use shorter Radio frequency lines is connected to the respective coupling coils in the wheel hub.

In beiden Fallen mussen mehr oder weniger aufwendige Kabelstrãnge verlegt werden, die störanfällig sind und bei Anhãnger-und Sattelauflegerbetrieb zusätzlich Spezialstecker und -kupplungen aufweisen.In both cases more or less complex cable looms are required are laid that are prone to failure and with trailer and semi-trailer operation additionally have special plugs and couplings.

Der Idealfall wäre die Reduzierung auf eine einzige, nur die Versorgungsspannung führende, Zuleitung - kombiniert für Stromversorgung und Steuersignal - von jeder Radmeßstelle zur Anzeigetafel im Blickfeld des Fahrers. Hierfür wird erfindungsgemäß eine Neuaufteilung des Schaltungskonzeptes nach Figur vorgeschlagen. Dabei bedeuten 1 8 den Hochfrequenzoszillator, der über 1 7 gewobbelt wird und die Senderendstufe 1 9 ansteuert, an die die Senderantennenspule 1 3 angekoppelt ist. Die Empfängerantennenspule 1 4 ist an den Verstarker 2 1 angekoppelt, welchem über einen Gleichrichter 2 2 eine Impuls-Zeit-Speicherschaltung 2 3 folgt, die über eine Schaltstufe 2 4 fallweise den Belastungswiderstand R an- oder abschaltet. Die von der Fahrzeugmindestgeschwindigkeit abhangigeBereitschaftsschaltung für die Warnanzeige besteht aus - beispielsweise - einer Aufnahmespule am Tachometer 2 6, einem Verstärker fur die induzierte Wechselspannung 2 7, einem Impuls-Zeit-Speicher 2 8 mit Schaltstufe 2 9, die das Überwachungssteuergerät 3 0 mit seinen nachgeschalteten Warnsignalen 3 1 und 3 2 in Funktion setzen kann, was durch die Signallampe 2 5 angezeigt wird, wobei gleichzeitig in dem Gerät 3 0 auch die Stromänderungen der einzelnen Radmeßstellen ausgewertet werden. Die ganze Anlage wird über 2 0 mit einer stabilisierten Betriebsspannung versorgt.The ideal case would be the reduction to a single supply voltage only leading, supply line - combined for power supply and control signal - from each Wheel measuring point to the display board in the driver's field of vision. For this purpose, according to the invention a redistribution of the circuit concept according to figure proposed. Mean 1 8 the high-frequency oscillator that is swept over 1 7 and the transmitter output stage 1 9 controls to which the transmitter antenna coil 1 3 is coupled. The receiver antenna coil 1 4 is coupled to the amplifier 2 1, which via a rectifier 2 2 a pulse-time storage circuit 2 3 follows, which is via a switching stage 2 4 on a case-by-case basis switches the load resistor R on or off. The one from the minimum vehicle speed Dependent standby mode for the warning display consists of - for example - a pick-up coil on the tachometer 26, an amplifier for the induced alternating voltage 2 7, a pulse-time memory 2 8 with switching stage 2 9, which is the monitoring control unit 3 0 can operate with its downstream warning signals 3 1 and 3 2, what is indicated by the signal lamp 2 5, while at the same time in the device 3 0 the current changes of the individual wheel measuring points can also be evaluated. The whole The system is supplied with a stabilized operating voltage via 2 0.

3 Patentansprüche 3 claims

Claims (3)

Patentansprüche: g Übertragungseinrichtung zur drahtlosen Übertragung von dem Zustand von Kraftfahrzeugreifen und -rãdern und deren Bremseinrichtungen zugeordneten Signalen nach den Patentansprüchen 1, 2, 3, 4, 5, 8, 9, lo des Hauptpatentes Akt. Z.P. 2523 488.2-52, dadurch gekennzeichnet, daß die beiden Koppelspulen, die am relativ feststehenden Fahrzeugteil und in Nãhe der Raderinnenseiten befestigt sind, zu einer Oszillatorschaltung gehören, die mit dem am Rad, vorzugsweise-am Felgenrand, befestigten Koppelschwingkreis, welcher in Abhängigkeit von den Zustandswerten der Reifen und Räder fallweise ein- und ausgeschaltet oder verstimmt wird, auf gleiche Frequenz, die gegebenenfalls zusätzlich gewobbelt werden kann, abgestimmt ist, so daß während jeder Radumdrehung eine kurzzeitige Rückwirkung auf Amplitude und/oder Frequenz der Hochfrequenzschwingungen entsteht, was zur Steuerung einer Alarmanlage ausgewertet werden kann. Claims: g Transmission device for wireless transmission the condition of motor vehicle tires and wheels and their braking systems associated signals according to claims 1, 2, 3, 4, 5, 8, 9, lo of the main patent Act. Z.P. 2523 488.2-52, characterized in that the two coupling coils, the attached to the relatively fixed part of the vehicle and near the inside of the wheels are, belong to an oscillator circuit, which with the on the wheel, preferably-on Rim edge, fixed coupling oscillating circuit, which depends on the state values the tires and wheels are switched on and off or detuned on a case-by-case basis, in the same way Frequency, which can optionally also be wobbled, is tuned, so that during each wheel revolution there is a brief reaction to the amplitude and / or Frequency of high frequency vibrations is created, which is used to control an alarm system can be evaluated. 2. Anordnung nach Anspr. 1, dadurch gekennzeichnet, daß eine Oszillatorschaltung mit interner Rückkopplung und daher nur einer Schwingkreisspule verwendet wird, welcher direkt oder über eine Koppelspule vom, vorzugsweise am Felgenrand angebrachten, Koppelschwingkreis bei jeder Radumdrehung intermittierend soviel Hochfrequenzenergie entzogen wird, daß die daraus resultierenden Änderungen von Schwingamplitude und/oder -Frequenz über eine Auswerteschaltung zur Steuerung einer Warnanzeige ausgenutzt werden konnen. 2. Arrangement according to cont. 1, characterized in that an oscillator circuit with internal feedback and therefore only one resonant circuit coil is used, which is attached directly or via a coupling coil, preferably on the rim edge, Coupling resonant circuit intermittently as much high-frequency energy with each wheel revolution is withdrawn that the resulting changes in vibration amplitude and / or -Frequency used via an evaluation circuit to control a warning display can be. 3. Anordnung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß jede Radmeßstelle nur eine Versorgungsspannungszuleitung erhält und in einem wasserdichten Gehäuse außer den Koppelspulen mit ihren dazugehorigen Hochfrequenzschaltungen eine Impulsauswerteschaltung untergebracht ist, die bei einem Rad- oder Reifenschaden einen zusätzlichen - die übrigen Funktionen aber nicht beeinträchtigenden, Stromverbraucher ein- oder abschaltet, so daß die daraus resultierenden Stromänderungen der jeweiligen Meßstellen im vorzugsweise im Fahrerhaus angeordneten Stromversorgungsteil zur Steuerung von optischen und/oder akustischen Warnsignalen ausgewertet werden können.3. Arrangement according to claim 1 and 2, characterized in that each Radmeßstelle only receives a supply voltage lead and in a watertight Housing apart from the coupling coils with their associated high-frequency circuits Pulse evaluation circuit is housed in the event of a wheel or tire damage an additional electricity consumer that does not affect the other functions on or off, so that the resulting current changes of the respective Measuring points in the power supply unit for control, which is preferably arranged in the driver's cab can be evaluated by optical and / or acoustic warning signals.
DE19762653167 1975-05-27 1976-11-23 Transmission of state of motor vehicle tyres, wheels and brakes - using two coupling coils on vehicle belonging to oscillator circuit tuned to same frequency as coupling circuit mounted on wheel rim Withdrawn DE2653167A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762653167 DE2653167A1 (en) 1975-05-27 1976-11-23 Transmission of state of motor vehicle tyres, wheels and brakes - using two coupling coils on vehicle belonging to oscillator circuit tuned to same frequency as coupling circuit mounted on wheel rim

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19752523488 DE2523488C3 (en) 1975-05-27 1975-05-27 Arrangement and design of the coupling elements of an electronic tire and brake monitoring system
DE19762653167 DE2653167A1 (en) 1975-05-27 1976-11-23 Transmission of state of motor vehicle tyres, wheels and brakes - using two coupling coils on vehicle belonging to oscillator circuit tuned to same frequency as coupling circuit mounted on wheel rim

Publications (1)

Publication Number Publication Date
DE2653167A1 true DE2653167A1 (en) 1978-05-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762653167 Withdrawn DE2653167A1 (en) 1975-05-27 1976-11-23 Transmission of state of motor vehicle tyres, wheels and brakes - using two coupling coils on vehicle belonging to oscillator circuit tuned to same frequency as coupling circuit mounted on wheel rim

Country Status (1)

Country Link
DE (1) DE2653167A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2907034A1 (en) * 1978-02-28 1980-01-17 Bridgestone Tire Co Ltd AIR TIRE ALARM
FR2465373A1 (en) * 1979-09-13 1981-03-20 Lucas Industries Ltd CIRCUIT FOR DETECTING THE STATUS OF AN ISOLATED SWITCH CONTACT AND A TIRE PRESSURE ADJUSTING INSTALLATION HAVING SUCH A DEVICE
DE19853135B4 (en) * 1998-11-18 2011-02-03 Robert Bosch Gmbh Apparatus and method for wireless pressure measurement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2907034A1 (en) * 1978-02-28 1980-01-17 Bridgestone Tire Co Ltd AIR TIRE ALARM
FR2465373A1 (en) * 1979-09-13 1981-03-20 Lucas Industries Ltd CIRCUIT FOR DETECTING THE STATUS OF AN ISOLATED SWITCH CONTACT AND A TIRE PRESSURE ADJUSTING INSTALLATION HAVING SUCH A DEVICE
DE19853135B4 (en) * 1998-11-18 2011-02-03 Robert Bosch Gmbh Apparatus and method for wireless pressure measurement

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