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WO1994018017A1 - Capuchon de valve avec un dispositif pour la production d'un signal de pression pour un pneumatique de vehicule equipe d'une valve - Google Patents

Capuchon de valve avec un dispositif pour la production d'un signal de pression pour un pneumatique de vehicule equipe d'une valve Download PDF

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Publication number
WO1994018017A1
WO1994018017A1 PCT/EP1994/000340 EP9400340W WO9418017A1 WO 1994018017 A1 WO1994018017 A1 WO 1994018017A1 EP 9400340 W EP9400340 W EP 9400340W WO 9418017 A1 WO9418017 A1 WO 9418017A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
signal
valve cap
valve
cap according
Prior art date
Application number
PCT/EP1994/000340
Other languages
German (de)
English (en)
Inventor
Rainer Achterholt
Original Assignee
Alpha-Beta Electronics Ag
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 Alpha-Beta Electronics Ag filed Critical Alpha-Beta Electronics Ag
Publication of WO1994018017A1 publication Critical patent/WO1994018017A1/fr

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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
    • 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
    • B60C23/0491—Constructional details of means for attaching the control device
    • B60C23/0496—Valve stem attachments positioned outside of the tyre chamber

Definitions

  • Valve cap with a device for generating a pressure indication signal for one with a valve
  • the invention relates to a valve cap with a device for generating a pressure display signal for a vehicle tire equipped with a valve.
  • Compressed air tires of cars, trucks and buses are particularly suitable as such vehicle tires.
  • the invention relates to a valve cap with a device for generating a pressure display signal (signal generating device) for a vehicle tire equipped with a valve, which has:
  • a housing which can be screwed onto a valve tube of the valve (tire valve) and in which the signal generating device is accommodated
  • a valve cap of this type is known from German Patent No. 39 30 480. The one described there
  • Signal generating device has a reference pressure chamber which can be subjected to a target tire pressure during the screwing-on process with the tire valve open and which is then closed pressure-tight.
  • the reference pressure chamber is partially delimited by a deflectable membrane which carries a movable switching element of a pneumatic-mechanical pressure switch. If the switch contact of this pressure switch is closed, a transmitter is activated which emits a pressure display signal.
  • the sensitivity of such a pneumatic-mechanical pressure switch is not particularly high, because the deflection of a membrane requires significant pressure differences; As a rule, a sensitivity of less than 0.3 or 0.4 bar cannot be achieved. If there is a membrane made of thin plastic or rubber material, there is still a risk of gradual gas diffusion through this membrane, so that the set pressure set in the reference pressure chamber can change. Furthermore, the functions a) pressure-tight seal between the valve cap housing and the valve tube, b) opening of the valve device and loading of the reference pressure chamber with the tire pressure, and c) pressure-tight closing of the reference pressure chamber during the screwing-on process with fewer valve cap turns. There is only a short adjustment path of a few millimeters available, and high demands are made on the components required for this.
  • the object of the present invention is to provide a valve cap of the type mentioned, the signal generating device detects the tire pressure with the aid of a miniaturized absolute pressure sensor, which generates an electrical pressure signal, but the known difficulties in terms of reproducibility and electronic effort are considerably reduced .
  • a valve cap with a signal generating device is to be provided, which is of simple and robust construction, detects the tire pressure with an accuracy of at least 0.1 bar and which has only minimal power consumption even when used for several years.
  • a valve cap of this type is to be provided, which additionally has a pressure signal display device which can optionally be queried.
  • a pressure display signal for a vehicle tire equipped with a valve - With a screwable on a valve tube of the valve (tire valve) housing in which the signal generating device is housed, and
  • Valve cap on the valve tube opens the tire valve
  • the signal generating device comprises: a) an absolute pressure sensor which can be acted upon by the tire pressure and which generates an electrical pressure signal corresponding to the tire pressure;
  • the tire pressure is recorded using a miniaturized absolute pressure sensor.
  • This is a modified semiconductor component, preferably based on Si, on which the required transducer structure has additionally been generated micromechanically.
  • An exemplary solid-state absolute pressure sensor that follows
  • Type of a chip is built, contains a hermetically sealed vacuum reference space, which is partially delimited by a flexible membrane or bridge, which has a transducer system.
  • the converter system can be a piezoresistive converter, the resistance elements of which are connected in the manner of a Wheatstone bridge.
  • the converter system can be part of a capacitive bridge circuit which is provided, for example, with four capacitors.
  • the micromechanically generated transducer structure can be monolithically linked to other circuit functions, for example to stabilize the input voltage and generate a reference voltage, to compensate for temperature effects, to set the zero point, the sensitivity and the measuring range.
  • the absolute pressure sensor can be implemented together with other components (microprocessor, temperature sensor, acceleration sensor, circuit components) on a chip, which in turn can be attached to a glass or ceramic substrate.
  • Solid-state absolute pressure sensors of this type with a piezo-resistive transducer system are available, for example, for pressure measurements in the range from 0 to 3.5 bar or from 0 to 7.0 bar or from 0 to 14 bar gauge pressure and are in a temperature range of -40 ° C. can be used up to + 125 ° C. In the pressure range of about 1 to 7 bar gauge pressure, which is of particular interest here, at least a measuring accuracy of 0.1 bar is achieved.
  • the output signal is typically a voltage whose value is a few volts.
  • the current consumption required for operation can be approximately 1 mA, for example.
  • a particularly high sensitivity (in the order of 10 mbar), high linearity and low temperature sensitivity can be achieved with converter systems with a capacitive bridge circuit.
  • An essential aspect of the present invention is to assign such an absolute pressure sensor an electronic memory in which a selected electrical pressure signal generated by the absolute pressure sensor can be permanently stored.
  • the sensor typically generates a voltage as the output signal.
  • This analog signal is preferably fed to an A / D converter in order to obtain a digitized pressure signal.
  • the digitized pressure signal which reproduces the detected pressure value, for example in the form of an 8-bit word or in the form of a 16-bit word, is permanently stored in the electronic memory.
  • a comparatively low capacity is required for the electronic memory because only one or more bit words have to be stored. It is important that the electronic memory can store the supplied bit words permanently and reliably with minimal power consumption.
  • a RAM with a continuous current requirement of less than 1 ⁇ A or an EEPROM can be considered as electronic memory with a minimal current requirement.
  • a RAM random excess memory or a random access memory
  • RAM is commercially available, for example, which at a voltage of approximately 1.5 V only has a continuous current requirement of fractions of a micromapere. If such a RAM is buffered, for example, by a battery with a capacity of approximately 10 mA / h, an operating life of several years can be obtained.
  • An EEPROM electrically erasable programmable read only memory, or an electrically programmable and changeable read-only memory) saves the recorded data even after switching off the operating voltage.
  • the required voltage is applied to the "programming" input, and then the information (states) present at the various data inputs is transferred to the memory at the point to which the address points. Reading is done by creating the address and activating the read line. New information can be introduced and saved by electrical overwriting or rewriting.
  • EEPROMs and modified systems of this type are commercially available.
  • Absolute pressure sensor and an electronic memory for an electrical pressure signal an electronic equivalent to the reference pressure chamber is created in conventional tire pressure detection and display systems.
  • This "electronic equivalent" provides a number of advantages.
  • the accuracy of the target tire pressure value is at least 0.1 bar.
  • the “electronic equivalent” has no adjustable components that can be influenced by the acceleration forces on the rotating wheel.
  • the target tire pressure value stored in digitized form as a bit word can be stored for practically any length of time without a change or falsification occurring.
  • the stored pressure value is easily and quickly available for further processing in a microprocessor, in particular for a comparison with a new pressure value which corresponds to the current tire pressure.
  • a comparison signal is generated which is set in relation to a predetermined threshold value.
  • the sensitivity of the system and thus the triggering of a signal can be set with the aid of the distance and / or the threshold value.
  • the preferably digitized pressure value is only stored as a reference variable in order to be available for comparison purposes.
  • the absolute size of this stored value is of no great importance, as long as it is ensured that the pressure value to be used for comparison is generated and available under the same general conditions.
  • the comparatively complex calibration and calibration measures required for the correct and reproducible reproduction of absolute pressure values are therefore not necessary within the scope of the invention.
  • the absolute pressure sensor generates i.a. a selected electrical pressure signal which is stored in the electronic memory and which is available by means of electronic signal processing like a reference pressure.
  • the selected pressure signal must be generated if in
  • Vehicle tires have the intended target tire pressure and the valve cap has been screwed onto the tire valve in a pressure-tight manner.
  • the predetermined tire pressure which corresponds to the pressure readable on the pressure gauge of a service station.
  • the valve cap according to the invention has a starter which activates the signal generating device in order to detect the tire pressure which is then prevailing and as save the selected electrical pressure value in the electronic memory.
  • a starter is preferably provided which causes the formation and storage of the selected electrical pressure signal always after the valve cap has been screwed onto the valve tube of the tire valve.
  • a piezoelectric element can be attached to the valve cap housing, the actuation of which generates a voltage surge which activates the microprocessor. This piezoelectric element can be operated by the user in a targeted manner, or can be operated automatically by the valve tube when the valve cap is screwed onto the tire valve.
  • this starter can have a switch contact (pressure switch), which is closed during the screwing-on process using the valve tube of the tire valve.
  • a switch contact can be actuated by deforming an elastically deformable housing section of the valve cap. Such deformation can be carried out by hand or with the aid of a suitable object (car key, ballpoint pen tip and the like).
  • such a starter can have a magnetic field sensor which detects a permanent magnet.
  • a permanent magnet can be located on an auxiliary device that is used to screw on the
  • Valve cap is used on the tire valve.
  • Such an auxiliary device can be designed in the manner of a socket wrench which is adapted to the outer circumference of the valve cap.
  • an anti-theft device can also be implemented, which only enables the valve cap to be unscrewed using the key.
  • the Magnetic field sensor detects the presence or distance of the
  • Permanent magnets For example, a reed contact, a Hall sensor or a magnetically controllable transistor can be considered as a magnetic field sensor.
  • a magnetically controllable transistor is preferably provided, which is small, robust and mechanically insensitive. With the aid of a corresponding circuit having a delay element, it can be achieved that the tire pressure is only recorded after a short, predetermined period of time has passed after the valve device was opened. In this way it can be ensured that the target tire pressure which is established after pressure equalization in the tire and in the valve is actually determined, without being falsified by any flow processes and the like in the valve.
  • the electrical pressure signal generated in this way corresponding to a predetermined tire pressure, serves as a "selected pressure signal" and is stored in the electronic memory.
  • This selected pressure signal primarily serves as a reference signal when comparing with new pressure signals generated later, which then correspond to the current tire pressure.
  • a pressure value adapted to the system is contained in the electronic memory and / or in the microprocessor, which corresponds to the typical tire pressure of the vehicle tire provided, for example in the order of about 1.0 to 2.5 in the case of car tires bar or in the case of truck tires in an order of magnitude of about 3 to 7 bar overpressure.
  • the selected pressure signal is then compared with the pressure value specified a priori in order to detect gross errors when filling the tire, for example if a significantly lower cold inflation pressure is set.
  • the microprocessor emits a corresponding signal and an indication of the incorrect filling pressure can be displayed on the dashboard of the vehicle.
  • the electrical pressure signal generated by the absolute pressure sensor will initially be in the form of an analog signal. It is preferably provided that this analog signal is digitized and the digital signal obtained, for example an 8-bit word or a
  • 16-bit word is saved or used for signal comparison.
  • the analog / digital converters required for digitization are simple and inexpensive and can be integrated on the chip as an additional electronic component.
  • the electronic memory is preferably designed as a digital memory.
  • Digital memories of this type are comparatively simple and are commercially available.
  • the signal generating device has at least one temperature sensor designed as a semiconductor component.
  • the temperature sensor should preferably have at least a measuring range of approximately -40 ° C. to + 150 ° C.
  • the temperature of the pressure medium in the tire is detected with the aid of the temperature sensor.
  • temperature-related deviations of the recorded tire pressure from the standard conditions can be compensated for.
  • an alarm can be triggered when a threshold temperature is exceeded, which is particularly important in truck use.
  • the absolute pressure sensor and the electronic memory are controlled / activated by a microprocessor, which also carries out the signal processing of the electrical pressure signals.
  • the microprocessor has an arithmetic unit that - compares a newly generated electrical pressure signal with the selected stored pressure signal and generates a comparison signal;
  • the microprocessor is preferably deactivated as a rule and is only activated specifically for short moments. After the required functions have been activated and executed, the microprocessor is automatically deactivated again. This mode of operation significantly reduces electricity consumption. Activation of the microprocessor can be carried out periodically or optionally to query a pressure display by the user.
  • a clock generator is preferably provided for the periodic activation, with the aid of which a system clock for the periodic activation of the measuring system is generated.
  • the clock generator consumes less than 30 nano amps of current. With the help of the clock generator, it is possible to put the microprocessor and the sensors controlled by it only into operation periodically. In the idle state, the microprocessor can be switched off completely and then does not consume any energy.
  • the pulse of the clock generator can switch the microprocessor to the operating voltage every 4 seconds. This starts the system and the various sensors record the respective conditions, such as tire pressure, Be acceleration and temperature.
  • the electrical signals formed are fed to the microprocessor, where they are processed and compared with the stored values.
  • a protocol is sent if the specified distances from the specified threshold values are exceeded or undershot.
  • the protocol can provide various alarm signals, for example an indication of a low tire inflation pressure, an "immediate warning" if a predetermined leak rate is exceeded or a "gentle warning” if only a moderate leak rate of the order of about 0.1 bar / Month occurs.
  • alarm signals can consist of different signal frequencies that are generated by the microprocessor and emitted by the transmitting antenna of a transmitter of the signal generating device. Good results have been achieved with a radiation power of the transmission antenna of approximately 6 mW.
  • Each "active valve cap” or its transmitter is assigned a stationary receiver on the vehicle chassis adjacent to the vehicle wheel.
  • the system only needs a few milliseconds for the routine query of the measured values and signal processing with the result that a protocol does not have to be sent. If the system also sends out a protocol, the system must be activated for a few 10 milliseconds. The microprocessor then switches itself off again and the system waits for the next initialization.
  • an acceleration sensor it is possible with the aid of an acceleration sensor to set this initialization, which takes place every 4 seconds, only when the vehicle is at least moving at walking speed. If the vehicle is at rest, the periodic interrogation of the sensors can be completely omitted or can only be carried out at much larger intervals.
  • the acceleration sensor can be used to switch between slow travel (for example City traffic or stop-and-go traffic) and fast driving (e.g. motorway driving) can be distinguished.
  • the absolute pressure sensor and / or the microprocessor can be activated at larger (for example every 30 to 60 see) or in smaller (for example every 2 to 3 see) time intervals.
  • Such an acceleration sensor is basically constructed in a similar way to the absolute pressure sensor explained at the outset, and has a membrane that is stressed under the action of acceleration values.
  • the membrane forms components of or is connected to resistance elements or capacitors, the electrical properties of which are changed in accordance with the acceleration values that occur.
  • the acceleration sensor generates an electrical output signal that is a measure of the acceleration values that occur. Acceleration values in the vertical direction of up to about 25 g can occur on the vehicle wheel of a car due to road bumps; At a vehicle speed of 250 km / h, centrifugal acceleration of up to 830 g can occur on the vehicle wheel. The acceleration sensor must withstand such acceleration values.
  • acceleration sensor can be formed on a common chip together with the other components (for example absolute pressure sensor, memory, A / D converter, microprocessor).
  • the periodic pressure query is preferably only activated with the aid of the acceleration sensor if the vehicle is moved at least at walking speed (5 km / h).
  • a second absolute pressure sensor instead of an acceleration sensor, which detects the small, periodic pressure surges that typically occur on a rotating vehicle wheel.
  • a second absolute pressure sensor it was possible to differentiate between vehicle standstill and moving vehicle in order to activate the microprocessor and the sensors controlled by it only when the vehicle is driving.
  • a very energy-saving mode of operation can be realized.
  • This energy-saving mode of operation of the entire system increases the life of the power source considerably.
  • a lithium battery can be used as the current source, which has a capacity of approximately 40 mAh and supplies a voltage of 3 V.
  • Such a battery can be designed as a button cell.
  • Voltage monitoring can be provided for such a battery.
  • the capacity of the battery can be checked cyclically and an alarm signal can be sent if the values are reduced. This makes it possible for a long time Before the system fails due to insufficient battery capacity, an appropriate warning signal is generated in order to take countermeasures.
  • a valve cap according to the invention whose signal generating device has the components listed above, can - at least on the moving vehicle - continuously monitor the tire pressure in a vehicle tire equipped with this valve cap. If the current tire pressure drops compared to a predetermined tire pressure that corresponds to the stored, selected pressure signal, an alarm signal is generated.
  • Various alarm signals can be generated, for example in the event of a sudden decrease in pressure or in the event of a gradual decrease in pressure or in the event of overheating or incorrect filling pressure and the like.
  • Each of these alarm signals can consist of different signal frequencies.
  • the signal frequencies are transmitted telemetrically to a receiver using a transmitter.
  • the signals received by the receiver are processed and used to display the tire condition on the dashboard of the vehicle.
  • the signal generating device provided for this embodiment of a valve cap is additionally equipped with a transmitter and a battery.
  • This comparatively complex embodiment of a valve cap is preferably used to equip truck tires including twin and
  • valve cap In a further embodiment of a valve cap according to the invention, its microprocessor is - after the first
  • the microprocessor can optionally be activated by mechanical action on the valve cap or without contact.
  • a pressure switch can be operated or a piezo-electric element can be operated.
  • the pressure switch or element can be located under a flexible hermetically sealed sheath or membrane, which can be made of plastic or metal. The operation can be carried out by hand or with the aid of an object such as a ballpoint pen tip or the like.
  • the approach of a permanent magnet can be provided, which is detected by a magnetic field sensor of the signal generating device.
  • This magnet can be located, for example, on the key already mentioned, which is intended for screwing the valve cap onto a tire valve.
  • the microprocessor After such an optional activation of the microprocessor, it will activate the absolute pressure sensor in order to record the current tire pressure.
  • the electrical pressure signal thus newly formed is compared with the selected stored pressure signal.
  • the comparison signal formed is related to a threshold value in order to only trigger an alarm signal when a predetermined pressure drop has been exceeded.
  • the alarm signal generated when the pressure drop is sufficiently large can be displayed directly by the valve cap or transmitted wirelessly to an external display device.
  • the display device on the valve cap is preferably an optical display device, the one or more can have differently colored glow lamps.
  • the meaning of "tire pressure in order" can be expressed by lighting up a green glow lamp.
  • the lighting of a red glow lamp indicates a significant drop in pressure.
  • These lamps can be protected under a transparent, hermetically sealed cover.
  • Such an electrical display of the tire condition which is carried out on request, brings a considerable advance over the known mechanical display systems on valve caps, because in the latter the differences between the yes and no statements could often only be slight due to the small dimensions.
  • This embodiment of a valve cap according to the invention has an electrically actuatable display device which delivers an optically perceptible pressure display signal.
  • This valve cap is also provided with a power source, preferably a battery.
  • the contact-free activation of the microprocessor can be carried out with the aid of an activation device that can be handled independently of the valve cap, wherein an approach of the activation device to the valve cap and / or actuation of the activation device brings about activation of the microprocessor.
  • This activation device can be a handpiece, a remote control element or the like, which has at least one component by means of which a magnetic, inductive, capacitive and / or telemetric coupling can take place with the signal generating device within the valve cap. For example, such a coupling can take place via a monofunctional or bi-functional transponder.
  • a display device can be provided on this activation device, on which the pressure display signal that is decoupled from the valve cap and transmitted wirelessly can be displayed.
  • the above-mentioned components and sensors of the signal generating device within the valve cap can be integrated in a single module, for example in ASIC technology.
  • the resulting ASIC component, the battery and the optional transmission antenna are combined in an encapsulated module.
  • the module is fastened inside the valve cap housing. There the sensors are in contact with the pressure medium in the tire to be overgrown after the valve cap has been screwed onto the valve tube and the tire valve has been opened.
  • the present invention aims to improve and develop the from the German patent
  • No. 39 30 480 known valve cap which has a signal generating device for generating a pressure indication signal.
  • a signal generating device for generating a pressure indication signal.
  • the valve cap 1 shown in the drawing is intended for the tire valve on a pneumatic vehicle tire and is provided with a display device which displays the current pressure state after being queried.
  • the valve cap has a housing 2 which is closed on one side and has a cylindrical peripheral wall 3 which merges in steps into an integrally molded sleeve section 4, on the inner circumference of which an internal thread 5 is formed.
  • This sleeve section 4 forms the open end of the valve cap 1, which can be screwed onto a tire valve, of which only a section of a valve tube 6 and a valve tappet 7 are shown in the present case.
  • the valve tube 6 is provided with an adapted external thread.
  • the valve lifter 7 is part of a conventional valve insert (cf.
  • the tire valve can be opened by depressing the valve tappet 7 against the bias of the spring.
  • a cap 8 made of transparent, flexible plastic is attached hermetically to the cylindrical peripheral wall 3.
  • This cap 8 is so flexible that it can be at least moderately pressed in with a finger or with a conventional object (car key) in order to actuate a pressure switch.
  • a pressure plate 10 is fastened to the gradation between the peripheral wall 3 and the sleeve section 4, from which an actuating member 12, which is approximately aligned with the longitudinal axis of the valve cap, projects in one piece.
  • an actuating member 12 On the valve lifter and presses it down, so that pressure medium can then flow from the open tire valve into the interior of the valve cap.
  • a through hole 14 offset from the longitudinal center axis, through which the pressure medium acts on the interior in the valve cap housing 2.
  • a cylindrical sleeve 15 is integrally formed on the pressure plate 10, the inner circumference of which is stepped.
  • the module of a signal generating device 20 is inserted into the cavity created in this way.
  • the components of the signal generating device 20 are only indicated schematically. These components include a circuit board 21 with a chip 22 which, as integrated components, has an absolute pressure sensor 23, an A / D converter 24, an electronic memory 25 and a microprocessor 26. Furthermore, there is a pressure switch 27 on the circuit board, to which a displaceably guided plunger 28 belongs, which can be adjusted by depressing the dome of the cap 8.
  • a battery 29 is arranged adjacent to the circuit board 21, for example a lithium battery, which is designed for a capacity of approximately 40 mAh. Below the transparent cap 8 there are two glow lamps, for example a green glow lamp 31 and a red glow lamp 32. These glow lamps are controlled via circuit elements of the microphone processor 26.
  • the sockets of the glow lamps and the other components are cast in synthetic resin and form a module 33, which has a projection on its outer circumference, which - as shown - can be snapped into a circumferential groove on the inner circumference of the sleeve 15.
  • Alternatively, other measures for fastening the module 33 to the sleeve 15 are also possible, for example fastening using screw bolts (not shown) or other fastening means.
  • this module has a diameter of approximately 20 mm and an axial length of approximately 10 to 12 mm in the valve cap housing.
  • the weight is only about 10 g, so that the additional attachment of this signal generating device creates a valve cap, the light weight of which does not produce any significant imbalance on the tire.
  • the elastic dome 8 can be depressed. This actuates a pressure switch 27, which activates a starter in order to form and store the selected, electrical pressure signal. If the pressure switch is operated again after a short period of time, the current tire pressure is recorded again and compared with the stored pressure value. Since there is no difference, the green lamp lights up ("tire pressure OK"). This also serves as an indication of the functionality of the system. The vehicle driver can now carry out a tire pressure check at any time and press the elastic cap 8 down again. If there is a larger difference between the current tire pressure and the stored pressure value the red lamp lights up ("dangerous pressure deviation"). The driver can then check the tire pressure and set it again correctly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Un capuchon (1) pour la valve d'un pneumatique de véhicule présente un dispositif (20) pour la production d'un signal de pression. Ce dispositif de production de signal comprend: (a) un détecteur de pression absolue (23), qui est exposé à la pression du pneumatique et qui produit un signal électrique de pression correspondant à la pression du pneumatique; (b) une mémoire électronique (25) dans laquelle un signal électrique de pression sélectionné ou un signal dérivé de ce premier signal peut être mis en mémoire de manière durable; (c) un microprocesseur (26) avec une unité arithmétique qui compare un nouveau signal électrique de pression au signal de pression sélectionné et mis en mémoire, qui produit un signal de comparaison, qui établit une relation entre le signal de comparaison et une valeur de seuil déterminée et qui provoque la formation du signal de pression lorsque l'écart entre le seuil et le signal de comparaison devient supérieur ou inférieur à une valeur déterminée; (d) un dispositif d'amorçage (27) dont l'actionnement provoque la formation et la mise en mémoire du signal électrique de pression sélectionné.
PCT/EP1994/000340 1993-02-08 1994-02-07 Capuchon de valve avec un dispositif pour la production d'un signal de pression pour un pneumatique de vehicule equipe d'une valve WO1994018017A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934303591 DE4303591C2 (de) 1993-02-08 1993-02-08 Ventilkappe mit einer Einrichtung zur Erzeugung eines Druckanzeigesignals für einen mit einem Ventil ausgerüsteten Fahrzeugreifen
DEP4303591.4 1993-02-08

Publications (1)

Publication Number Publication Date
WO1994018017A1 true WO1994018017A1 (fr) 1994-08-18

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PCT/EP1994/000340 WO1994018017A1 (fr) 1993-02-08 1994-02-07 Capuchon de valve avec un dispositif pour la production d'un signal de pression pour un pneumatique de vehicule equipe d'une valve

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DE (1) DE4303591C2 (fr)
WO (1) WO1994018017A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
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JP6328294B1 (ja) * 2017-04-28 2018-05-23 森　啓二 タイヤ空気圧警報器
CN112983592A (zh) * 2021-03-09 2021-06-18 广西玉柴机器股份有限公司 一种发动机机油压力实时监控安保方法
US12023968B2 (en) 2019-06-17 2024-07-02 Airbus Operations Limited Initialisation of tyre monitoring devices
US12058751B2 (en) 2019-06-17 2024-08-06 Airbus Operations Limited Configuration mode entry for a tire monitoring device

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US5767792A (en) * 1994-10-13 1998-06-16 Bio Medic Data Systems Inc. Method for calibrating a temperature sensing transponder
JPH08178784A (ja) * 1994-12-22 1996-07-12 Pacific Ind Co Ltd タイヤ空気圧警報装置
AUPN133795A0 (en) * 1995-02-23 1995-03-16 Cohen, Phillip Tyre pressure telemetry system
AU728312B2 (en) * 1995-02-23 2001-01-04 Phillip Albert Cohen Tyre pressure monitoring transponder mounted on a tyre valve
DE19534616B4 (de) * 1995-09-18 2007-01-11 Alpha-Beta Electronics Ag Reifendruck-Überwachungseinrichtung
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JP2018189439A (ja) * 2017-04-28 2018-11-29 森　啓二 タイヤ空気圧警報器
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CN112983592A (zh) * 2021-03-09 2021-06-18 广西玉柴机器股份有限公司 一种发动机机油压力实时监控安保方法

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