[go: up one dir, main page]

WO1993008035A1 - Procede, dispositif et valve de mesure et d'indication de la pression de gonflage d'un pneu - Google Patents

Procede, dispositif et valve de mesure et d'indication de la pression de gonflage d'un pneu Download PDF

Info

Publication number
WO1993008035A1
WO1993008035A1 PCT/EP1992/002377 EP9202377W WO9308035A1 WO 1993008035 A1 WO1993008035 A1 WO 1993008035A1 EP 9202377 W EP9202377 W EP 9202377W WO 9308035 A1 WO9308035 A1 WO 9308035A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
pressure
valve
tire
activation
Prior art date
Application number
PCT/EP1992/002377
Other languages
German (de)
English (en)
Inventor
Rainer Achterholt
Original Assignee
Rainer Achterholt
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 DE4133993A external-priority patent/DE4133993C2/de
Priority claimed from DE4133999A external-priority patent/DE4133999C2/de
Application filed by Rainer Achterholt filed Critical Rainer Achterholt
Publication of WO1993008035A1 publication Critical patent/WO1993008035A1/fr

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
    • B60C23/0491—Constructional details of means for attaching the control device
    • B60C23/0494—Valve stem attachments positioned inside the tyre chamber
    • 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
    • B60C23/0423—Photo-electric, infrared or visible light means
    • 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
    • B60C23/0479—Communicating with external units being not part of the vehicle, e.g. tools for diagnostic, mobile phones, electronic keys or service stations

Definitions

  • the invention relates to a method and a device for measuring and displaying the pressure in a pneumatic tire.
  • the invention further relates to a valve for such a device.
  • the device is particularly intended for pressure measurement on the tires of cars, trucks, buses and aircraft.
  • a valve with a signal generating device for vehicle tires which has a valve foot from which a valve stem protrudes.
  • a device for generating a wirelessly transmitted pressure signal (signal generating device) is attached, which has at least one pressure sensor, one or more circuit devices for generating the pressure signal, and a source for electrical energy.
  • Signal transmission serves electromagnetic radiation with frequencies in the kHz range.
  • a membrane serves as the pressure sensor, which can be deflected in the event of abnormal tire pressure.
  • the membrane forms or carries the movable switching element of a mechanical switch, the circuit of which is closed when the membrane is deflected, whereupon the transmitting device is activated.
  • the well-known valve generates a signal frequency only if the one to be monitored
  • Tire pressure is less than a target pressure. However, there is a desire to change the current tire pressure as desired
  • Document DE-C-36 00 830 discloses a tire pressure measuring and display device in which a deflectable membrane is provided as the pressure sensor, which is arranged within a valve cap and on which the tire pressure acts.
  • a permanent magnet is adjusted according to the tire pressure-dependent membrane deflection, and the distance between the permanent magnet and a reference plane serves as a "pressure signal".
  • This distance of the magnet is detected with the aid of a proximity sensor which operates without contact and is located in a handpiece which can be handled independently of the valve cap and which must be brought into abutment against the valve cap in a defined manner.
  • the output signal of the proximity sensor is processed with the aid of an electronic circuit which supplies a signal for driving a pressure display device.
  • the pressure display device can be designed as an easily readable liquid crystal or light-emitting diode number display with several display fields. Thanks to a memory device, the tire pressure can also be read away from the valve cap.
  • a disadvantage of the known device is that, in order to transmit the “pressure signal”, the handpiece must be brought to bear against the valve cap in a defined arrangement. Furthermore, the pressure detection with the aid of a deflectable membrane limits the accuracy and the reproducibility of the pressure value determination.
  • the documents US-A-4 250 759 and US-A-4 704 901 disclose hand-held devices which are equipped with a pressure sensor, a power source and the necessary circuitry for generating a digital pressure display. These handheld devices are mechanically coupled to a tire valve, whereby a valve tappet is depressed so that the tire pressure can act on the pressure sensor in the hand-held device. Another disadvantage is the requirement for mechanical coupling of the hand-held device and the tire valve. In addition, experience has shown that the type of coupling of the device to the tire valve influences the pressure display in such handheld devices.
  • Document DE-A-28 50 787 relates to a tire pressure alarm device which has a pressure sensor, an electromagnetic current generator and a transmitter for a pressure signal on the rotating wheel, which is transmitted telemetrically to a receiver which is housed on the vehicle chassis .
  • the pressure sensor is a pressure switch equipped with a membrane.
  • the membrane adjusts a movably arranged switching element that opens or closes a circuit.
  • the pneumatically operated pressure switch responds to certain threshold values, and accordingly a "warning" or “alarm” display can be generated.
  • the continuous monitoring and display of the tire pressure is not possible with this known device.
  • a handheld device can be provided with which the functionality of the known tire pressure alarm device can be checked.
  • the hand-held device is aimed at a tire in order to telemetrically activate its pressure sensor.
  • a pressure signal is then generated, teletrically transmitted to the handheld device and displayed there.
  • the states mentioned above can be displayed.
  • Absolute pressure sensors have become known which deliver an electrical output signal which corresponds to the detected pressure. Such absolute pressure sensors have hitherto not been used for tire pressure monitoring on vehicle tires.
  • Another object of the invention is to provide a device for carrying out this method, with which — when the vehicle is stationary — the current tire pressure can be queried simply and conveniently and displayed in a clearly visible manner.
  • a valve is to be provided for this device.
  • the remote control element is directed towards the tire to be tested from a comfortable distance, and the activation signal is triggered by actuation of a button or a switch. Immediately afterwards, the large-format LCD display of the remote control element shows the numerical pressure of the tire being shown.
  • the reading / display instrument is designed as a remote control element, as is known, for example, from the operation of TV sets.
  • the source for the activation signal is located on an end face of the elongated cuboid remote control element. This source is aimed at the tire whose pressure is to be checked.
  • a distance of approximately 50 to 200 cm between the remote control element and the tire to be tested is typically to be maintained.
  • the remote control element is provided with a button or switch, its actuation triggers the activation signal and the receiving device and the evaluation devices are set to a standby state. Since the power-consuming components of the remote control element are only in operation for a short time, the battery provided for the power supply in the remote control element has a long service life. This battery can be replaced once it has been used up.
  • the valve is housed:
  • an absolute pressure sensor which is designed as a semiconductor component and which delivers an electrical output signal
  • an activation device which controls the absolute pressure sensor, the switching device (s) and the transmission unit. direction then activated after an activation signal has been received.
  • the receiving device and the activation device have to be kept in a standby condition. All that is required is a minimal current consumption, for example in the order of magnitude of a few microamperes.
  • the activation device activates the components on the valve required to generate and transmit the signal frequency;
  • the absolute pressure sensor is supplied with voltage and the circuit device (s) and the transmitting device are put into operation.
  • a sequence control ensures a short-term transmission of the pressure signal; for example, the duration of the transmission or the number of pressure signal pulses transmitted can be limited. Then the power supply to the absolute pressure sensor, the switching device (s) and the transmitting devices is interrupted again.
  • a long service life of the power source is obtained on the valve.
  • a lithium battery with the dimensions of a button cell which has a nominal voltage of approximately 3 V and a capacity of approximately 50 rnAh, more than 200 transmissions of the current tire pressure can be carried out.
  • the valve will function for several years.
  • a larger battery with a larger capacity could easily be attached to the valve base within the tire cavity.
  • a signal transmission path with a path length of approximately 50 to is expediently used
  • a path length of the signal transmission path of approximately 100 to 150 cm has proven particularly useful.
  • the wireless signal transmission takes place with the aid of electromagnetic radiation, the frequency of which is not particularly limited.
  • electromagnetic radiation the frequency of which is not particularly limited.
  • comparatively long-wave frequencies in the kilo- and mega-Hertz range can be provided for signal transmission.
  • a suitable frequency range comprises the red part of the visible light and the near infrared radiation, that is to say radiation with wavelengths of approximately 650 to 1400 nm. Radiation in this wavelength range is referred to below as "IR radiation" for short.
  • IR radiation Radiation with wavelengths between approximately 800 and 1000 nm, which can be generated with the aid of GaAs LEDs, is particularly suitable.
  • Such radiation is sufficiently reflected in the environment in question here to ensure reliable signal transmission between the valve and the remote control element even when the valve is in an unfavorable position.
  • the optoelectronic components LEDs, photodiodes
  • the known remote control elements for TV sets provide experience with regard to the selection of suitable optoelectronic components and the design of suitable circuits for signal transmission with IR radiation.
  • the known IR LEDs such as luminescent diodes or laser diodes, can be used as transmitting devices for the IR radiation. Luminescent diodes also provide largely monochromatic radiation.
  • GaAs LEDs are used in particular. They have good efficiency and are suitable for low-frequency modulation in the kHz range. Discrete LED components are small and only have dimensions in the millimeter range. Such LED components can also be integrated in hybrid circuits. The emission and reception characteristics can be influenced with the aid of optically conductive components and / or the housing shape.
  • a photodiode is preferably used as the receiving device.
  • an Si photodiode is provided, which has a high sensitivity in the spectral range between about 800 and 1000 nm. The maximum sensitivity of the Si photodiode almost coincides with the emission of the GaAs diode.
  • photodiodes have a high response time in the range of nanoseconds, so that low-frequency modulation of the IR radiation in the kHz range can also be detected.
  • Photodiodes also have small dimensions in the millimeter range and can also be integrated in hybrid circuits. The photodiode on the valve must be kept constantly ready to receive.
  • a transistor is preferably assigned to the photodiode.
  • the photo diode is operated in element mode, i.e. operated without preload.
  • the photodiode generates a voltage which is applied to the base of the transistor. Stand-by operation with minimal power consumption is obtained.
  • the tire pressure is detected with an absolute pressure sensor, which is designed as a semiconductor component and the one delivers current tire pressure corresponding electrical output signal.
  • Suitable semiconductor pressure sensors are available with small dimensions, for example as cuboid bodies with dimensions of approximately 6 x 6 x 3 mm.
  • the chip contains a hermetically sealed vacuum reference space and a piezo-resistive transducer to which the tire pressure to be monitored can be applied, the resistance elements of which are typically switched in the manner of a wheat tone bridge. Additional elements for compensating the temperature influences are located on the chip
  • Sensitivity and zero point adjustment can be integrated on the same chip.
  • the chip is located on a ceramic substrate which is designed for the assembly of a circuit board using SMD technology (surface mounted device).
  • such a semiconductor absolute pressure sensor can be integrated into a hybrid circuit.
  • Such an absolute pressure sensor generates analog signals in the form of electrical voltages as an electrical output signal. These signals are fed to an amplifier which, if necessary, can be integrated on the same component.
  • Such piezo-resistive solid-body absolute pressure sensors are available, for example, for pressure measurements in the range from 0 to 3.5 bar or 0 to 7.0 bar or 0 to 14 bar overpressure and are in a temperature range from -40 ° C to + + 125 ° C applicable. A temperature measurement can also be carried out in the same temperature range. In the pressure range of about 1 to 14 bar gauge pressure, which is of particular interest here, at least a measuring accuracy of 0.1 bar is achieved.
  • valve is primarily for use in connection with the preferably provided remote control element, other devices for generating the activation signal and for pressure display could also be provided, for example transmitter and receiver devices adjacent to the wheel on the chassis of the vehicle, and display devices on the dashboard.
  • the valve according to the invention includes:
  • a conventional valve having the necessary valve devices for a pneumatic tire, in particular for motor vehicle pneumatic tires, with a valve stem on which a valve foot is integrally formed;
  • an absolute pressure sensor designed as a semiconductor component, which is acted upon by the tire pressure and which supplies an electrical output signal corresponding to the tire pressure
  • one or more circuit devices for evaluating the electrical output signals of the absolute pressure sensor and for generating a pressure signal reflecting the tire pressure
  • a transmitting device which emits the pressure signal into the environment
  • an activation device which then activates the pressure sensor, the circuit device (s) and the transmission device after an activation signal has been received; and - a source of electrical energy.
  • the electrical output signal typically occurs as an analog signal in the form of an electrical voltage.
  • the circuit devices expediently include an amplifier for the electrical output signal, an analog / digital converter, and control logic for generating a certain coded pressure signal which corresponds to the electrical signal Output signal corresponds and an amplifier for this pressure signal.
  • the control logic can, for example, generate a digital signal in the form of rectangular pulses, the width of the pulses carrying the code. Frequencies in the kHz range are provided for this rectangular pulse, for example 100 kHz and more.
  • a carrier frequency is modulated with this digital signal, for example the IR radiation generated by a GaAs diode. Alternatively, a customary frequency modulation of the carrier frequency could also be provided for signal transmission.
  • Periodic sequences of the pressure signal with different frequencies can also be provided in order to rule out any interference with or from ambient radiation.
  • the data transmission can be carried out with the help of IR radiation.
  • an IR transmitter diode is provided as the transmitting device and an IR receiving diode is provided as the receiving device, as has been explained above.
  • the circuit devices and the transmitting device are preferably subjected to a sequence control which interrupts the generation and transmission of the pressure signals after a short period of time of the signal transmission;
  • the transmitted signal frequencies can be counted and the signal transmission can be interrupted after a predetermined count has been reached; alternatively, a specific duration of the signal transmission can be provided in accordance with a predetermined number of cycles. In any case, such a duration of the signal transmission is necessary and sufficient that guarantees the reception of an evaluable pressure signal at the remote control element. Limiting the duration of the signal transmission reduces the current requirement and increases the useful life of a given current source on the valve.
  • An electronic switch is preferably used as the activation device, which switches the absolute pressure sensor
  • Circuit devices and the transmitting device either connect to the current / voltage source or interrupt this connection.
  • Such an electronic switch can be implemented with the aid of transistors, for example as a MOS circuit.
  • the receiving device and the activation device are kept in a standby state with the aid of an energy-saving stand-by circuit.
  • An exemplary stand-by circuit has only a current consumption in the micro-ampere range, so that with a single commercially available button cell a sufficient life span of a valve is given.
  • a battery is typically used as the source of electrical energy; for example, conventional button cells can be provided.
  • the battery is preferably integrated as a further component with the electronic components of the circuit devices in order to avoid connections susceptible to corrosion.
  • the signal generating device with an absolute pressure sensor and energy source is attached to the valve base on the side facing away from the valve stem; ie when the valve is used as intended, the signal generating device is attached behind the tire rim and behind the valve foot inside the tire.
  • An arrangement must be selected for the transmitting and receiving device which ensures the propagation of the activation signal from the outside environment to the receiving device and the propagation of the pressure signal from the sending device into the outside environment. The following alternatives in particular can be provided for this.
  • the transmitting device and the receiving device are integrated in the signal generating device. All of the optoelectronic components and circuit devices, including the absolute pressure sensor, can be combined in one module, which simplifies the manufacture and the
  • At least one optical component is provided such that the transmitter and the receiver connect "optically" conductively to the outer periphery of the valve stem, in order to ensure such propagation of the signals.
  • This optical component can preferably include at least one optical waveguide, which is inserted into a bore which leads through the valve base and at least a section of the valve stem and opens to the outer circumference of the valve stem.
  • an annular body can be provided, which is fixed on the outer circumference of the valve stem and which is optically connected to the optical waveguide. The annular body can be assigned a reflector which bears against the outer circumference of the valve stem and which ensures collection / radiation around the valve stem.
  • the components mentioned that is, the absolute pressure sensor, the electronic components of the circuit devices, the transmitter device, the receiver device, the activation device and the energy source, are combined in a module at the valve base is appropriate.
  • a module can, for example, be implemented in hybrid technology and, in addition to the various circuit devices, also include the absolute pressure sensor, the IR LED and the IR photodiode.
  • the module can be designed as a printed circuit board equipped on both sides, on which the different ones Components and components in SMD technology ( ⁇ _urface mounted device) are designed and / or attached. The combination of these components in one module facilitates series production and promotes miniaturization.
  • An exemplary module (SMD technology) is designed as a round, disk-shaped body and has a diameter of approximately 15 mm and a structural height of approximately 4 mm. The weight is about 3 to 4 g. If the module is implemented in hybrid technology, all components / functions can be implemented on a chip measuring a few square millimeters.
  • the transmitting device and / or the receiving device are attached to the outer circumference of the valve stem.
  • Receiving devices are provided with housings, reflectors and / or optionally light guide elements in order to ensure a wide-angle collection / radiation of the radiation used for signal transmission, for example IR radiation, preferably around the entire circumference of the valve stem. Furthermore, there is an effective, electrically conductive connection from the receiving device and from the transmitting device to the signal generating device.
  • the activation signal picked up by the receiving device is forwarded in the form of electrical signals to the signal generating device.
  • the electrical pulses generated by the circuit devices of the signal generating device are fed to the transmitting device and emitted by the latter in the form of the pressure signals.
  • the device according to the invention also includes a remote control element with which the pressure of a particular tire can be queried and displayed without having to make direct physical contact between the tire valve and the remote control element.
  • a remote control element has at least: a flat, essentially cuboid housing on which a display for the pressure display and at least one button or switch for activation is formed; - At least one transmission device for an activation signal;
  • the housing of the remote control element typically consists of plastic, is comparatively elongated in the sense of a "handpiece" and has an end face which is directed at the tire to be tested.
  • the transmitting device (s) and the receiving device are accommodated behind this insert.
  • an IR signal transmission path can be provided for the signal transmission between the valve and the remote control element. Consequently, the transmitter (s) on the remote control element are also preferably designed as an IR transmitter diode and the receiver device as an IR receiver diode.
  • the circuit device for evaluating the pressure signals is preferably equipped with a filter in order to eliminate any interference and external signals.
  • a device for providing, displaying and storing the time of the tire pressure measurement is preferably present on the remote control element.
  • Typical watch crystals with an appropriate module can be used for this setup.
  • the circuit devices preferably include a memory device for data storage, for example in order to store the tire tested, the tire pressure determined and the time of the tire pressure test. The storage of this data is particularly useful for the commercial sector, for example in the case of trucks and buses.
  • additional sensors for detecting the ambient pressure and / or the ambient temperature can be present on the remote control element. If the ambient pressure deviates considerably from normal pressure, the displayed tire pressure can be corrected automatically. Furthermore, the temperature of the pressure sensor can also be transmitted with the transmission of the pressure signal. If necessary, this temperature can also be taken into account in the formation of the tire pressure display and, if necessary, displayed.
  • a display is expediently coupled to this device, which indicates whether the current tire pressure recorded in each case corresponds to the predetermined tire pressure setpoint or whether a correction of the current tire pressure is necessary, for example by refilling compressed air.
  • the Boundary conditions such as tire temperature, ambient pressure and ambient temperature are taken into account.
  • FIG. 1 schematically the measurement and display of the tire pressure of a pneumatic vehicle tire with the aid of a tire valve and a remote control element spatially distant therefrom;
  • FIG. 2a shows a sectional illustration of a first embodiment of the valve according to FIG. 1;
  • FIG. 2b shows a sectional illustration of a second embodiment of the valve according to FIG. 1;
  • FIG. 3 shows a sectional illustration of a remote control element according to FIG. 1;
  • FIG. 4a shows the components and circuit devices of the valve and their linking on the basis of a block diagram
  • FIG. 4b shows a subunit of the circuit devices according to FIG. 4a.
  • FIG. 5 uses a block diagram to show the components and circuit devices of the remote control element and their combination.
  • FIG. 1 shows a conventional, tubeless pneumatic tire 3, which is mounted on the rim 2 of a motor vehicle wheel 1.
  • This pneumatic tire 3 is equipped with a tire valve 4 according to the invention, in addition to the usual and conventional components of a tire valve, a signal generating device and the above-described refined active components.
  • the device also includes a remote control element 50 held by an operator, with which the air pressure of the tire 3 can be queried and displayed at a convenient distance from the motor vehicle wheel 1.
  • valve 4 The embodiment of a valve 4 according to the invention shown in FIG. 2a essentially consists of a conventional valve arrangement and a signal generating device.
  • the valve 4 has a valve stem 5 which delimits a valve bore 6.
  • a inner circumference of the valve bore 6 is a valve seat 7, against which a valve body 8 can rest, which is pressed against the valve seat 7 by a spring 9 and closes the valve 1.
  • a valve tappet 10 is integrally connected to the valve body 8, by means of which the valve body 8 can be removed from the valve seat 7, so that pressure medium can pass through the valve bore 6.
  • the outer circumference of the valve stem 5 is provided with a stepped external thread 11 and 12.
  • a valve foot 15 is integrally formed on the valve stem 5.
  • this valve 4 is guided through a valve hole in a rim 2, so that - with the interposition of one not shown. Seal - the Ventil ⁇ foot 15 comes to rest on the inner wall of the rim. Then a union nut is screwed onto the external thread 12 and the valve 4 is fixed on the rim 2.
  • valve 4 is intended for a tubeless vehicle tire.
  • the entire valve 4 is typically made of metal, such as a zinc / copper alloy or an aluminum alloy.
  • this signal generating device is designed as a module 40 which contains all the active components required for signal generation and transmission.
  • the module 40 has a circuit board 41 on which all active components are attached.
  • active components include an absolute pressure sensor 42, a microprocessor 43 and other electronic components and components 44, 44 ', 44 "with which the circuit devices are formed, an IR transmitter diode 45 and an IR Photo diode 47.
  • a button cell 48 which supplies the active components with current / voltage, alternatively the button cell 48 could be fastened to the circuit board 41 or integrated in a hybrid module which comprises all active components.
  • the necessary, only schematically indicated, electrically conductive connections are formed between the circuit board 41 and the individual active components and the button cell 48. These active components are preferably included
  • All components of the module 40 can be embedded in synthetic resin, a fluid connection between the absolute pressure sensor 42 and the tire interior being kept open.
  • the entire module 49 can be accommodated in a plastic housing 49, which is attached to the side of the valve base 15 facing away from the valve stem 5.
  • the housing 49 has bores (not shown) through which the absolute pressure sensor 42 is constantly subjected to the current tire pressure.
  • annular body 20 made of transparent plastic material is arranged on the outer circumference of the valve stem 5, preferably in the transition area between the narrower thread section 11 and the further thread section 12, an annular body 20 made of transparent plastic material is arranged.
  • the body 20 is around the entire outer circumference of the valve stem 5
  • At least one optical waveguide 22 provides an optically conductive connection between the ring-shaped body 20 and the IR transmitter diode 45 and the IR photodiode 47.
  • Each optical waveguide 22 can be inserted into a continuous bore 16 which is in the material of the valve stem 5 and of the valve base 15 is recessed.
  • the optical waveguide (s) 22 could be guided over the longer distance within the valve bore 6 and additionally inserted into a short through bore 16 which is recessed in the valve stem material and leads to the annular body 20.
  • the bore 16 is sealed in a pressure-tight manner, for example with the aid of elastic synthetic resin.
  • An activation signal impinging on the ring-shaped body 20 is conducted via the optical waveguide 22 to the IR photo diode 47 and generates a photo current there, the voltage of which is recorded and evaluated.
  • the pressure signal generated by the IR transmitter diode 45 is fed into the optical waveguide 22 and emitted into the environment via the annular body 20. If necessary, an annular body could also be provided for reception purposes and another for transmission purposes.
  • FIG. 2b shows a modified valve 4, which essentially corresponds to the valve 4 according to FIG. 2a.
  • the IR transmitter diode 45 and the IR photodiode 47 are arranged on the outer circumference of the valve stem 5 and are connected to the circuit board 41 of the signal generating device via connecting lines 26.
  • the electrically conductive connecting lines 26 can be inserted into bores 16 which are recessed in the valve base 15 and in the valve stem 5.
  • One ring-shaped light-guiding element 25 or 27 is optically coupled to the transmitter diode 45 or to the photodiode 47 and ensures wide-angle reception / radiation of the signals.
  • FIG. 3 schematically shows a remote control element 50, which has a flat, essentially cuboidal housing 51 with the dimensions of a typical handpiece.
  • An insert 53 which consists of transparent plastic material that is transparent to IR radiation, is inserted into the front end 52 of the housing 51. Elements (not shown) for collecting the radiation to be received and for bundling the transmitted radiation are formed on this insert.
  • the other end face is formed by a removable cover 55, after removal of which batteries 56 can be inserted into a battery compartment.
  • a removable cover 55 On the top side 57 of the housing 51 there is an LCD display panel 58, a large button 59 and a number of smaller buttons 60, 60 ", 60".
  • the large button 59 serves to activate the components of the remote control element 50.
  • the smaller buttons 60, 60 ', 60 are used for entering or querying data and for calling up certain functions, for example for characterizing a specific tire , for entering a target tire pressure, for outputting stored data and the like.
  • a circuit board 61 on which a microprocessor 62 and various electronic components 63, 63 'and 63 "are attached, with which the circuit devices for a transmission circuit for A reception circuit and for an evaluation and control circuit are realized. Furthermore, one or more IR transmission diode (s) 66 and an IR photodiode (not shown) are arranged adjacent to the IR-transparent insert 53.
  • FIG. 4a shows in the form of a block diagram the essential, active components of the valve 4 and their linkage; denote in detail:
  • VI an IR photodiode for receiving the activation signal
  • V2 an amplifier for the activation signal
  • V3 a testing and evaluation device with filter
  • V4 an activation device in the form of an electronic switch
  • V5 an electric battery
  • V6 an absolute pressure sensor in the form of a semiconductor component with a Wheatstone bridge circuit, the one. provides an analog output signal in the form of an electrical voltage which reflects the current tire pressure;
  • V7 an amplifier for the output signal
  • V8 an analog / digital converter to the analog
  • V9 a control logic for generating a digitally encoded print signal
  • Vll an amplifier for the pressure signal
  • V12 is an IR transmitter diode which emits the pressure signal.
  • the components VI, V2, V3 and V4 are combined in a subunit, the design of which is shown in FIG. 4b.
  • An IR square wave signal with a frequency of approximately 100 kHz can serve as the activation signal.
  • the activation signal is received with the aid of the IR photodiode VI.
  • a resistor Rl is located parallel to the receiving diode VI, which converts the photocurrent into a voltage.
  • This voltage is amplified by a transistor TI (field effect transistor).
  • the gain factor is determined by the collector resistance, which is chosen to be as high-resistance as possible.
  • the resulting collector voltage is coupled out by means of a high-pass filter R2 and passed to a capacitor C via a diode D.
  • a discharge resistor R3 is arranged parallel to the capacitor C and discharges the capacitor C after a certain time.
  • a further transistor T2 becomes conductive, which activates the reset of the circuit (V6 to V12) via the electrical switch V4.
  • Feedback prevents the circuit from being deactivated again before all data is transferred. were wearing.
  • the electronic switch V4 is subjected to such a sequence control that after a short-term signal transmission this electronic switch V4 is opened again and the power supply to the components V6 to V12 is interrupted. For example, these components V6 to V12 are put into operation for a period of about 0.5 seconds.
  • FIG. 5 shows the essential components of the remote control element 50 and their linking using a block diagram; these components include:
  • El a battery for power supply to the active components of the remote control element; E2 a button for activating the remote control element; E3 a number of further buttons for entering data; E4 a microprocessor
  • E5 a signal generator for generating an activation signal
  • E6 an amplifier for the activation signal
  • E7 an IR transmitter diode with which the activation signal is emitted;
  • E8 an IR photodiode with which the pressure signal generated by the active components of the valve is received;
  • E9 a preamplifier for this pressure signal;
  • Hurry a filter for the pressure signal;
  • E12 an optional absolute pressure sensor for generating an electrical output signal relating to the ambient pressure
  • E13 an amplifier for the electrical ambient pressure
  • E14 an analog / digital converter for this electrical output signal
  • E15 an LCD display for the queried tire pressure and possibly other parameters;
  • E16 an optional clock quartz with associated module for continuous formation of the time of day;
  • E17 a storage device.
  • the microprocessor E4 and the actual components are supplied with the necessary operating voltage via the battery El.
  • the Mikroproze ⁇ sor E4 starts a signal generator E5 (square wave voltage) r de ⁇ en signal via an amplifier E6 to an IR transmitting diode E7 passes, which generates an activation ⁇ ignal.
  • This activation signal reaches the IR photodiode VI in / on the valve 4 and the square-wave voltage is amplified via an amplifier V2 and is evaluated V3.
  • the square-wave voltage must be present at a certain frequency for a certain time (about 1 ⁇ ec), then the electronic switch V4 is actuated and the actual circuit is started up by the battery V5 for about 0.5 ⁇ ec. After approximately 1.0 sec, the microprocessor E4 switches the signal generator E5 off again and waits for a received signal. After the electronic switch V4 has been switched on, the tire pressure is measured via the absolute pressure sensor V6. This analog signal is sent via amplifier V7 to an analog / digital converter V8, which converts the analog tire pressure value into a serial digital signal. The analog / digital converter V8 and the amplifier V7 are supplied with the necessary control signals via a control logic V9.
  • the digital signal reaches the IR transmitter diode V12 via amplifier V7, which emits the digital value.
  • the IR photodiode E8 on the remote control element 50 receives the digital tire air pressure value and forwards it to the infrared preamplifier E9.
  • This signal reaches the microprocessor E4 via a filter Eil, which then forms a signal for the corresponding control of the display E15.
  • the tire temperature and the ambient conditions pressure, temperature
  • the current tire pressure of the queried tire is shown on the display E15 with an accuracy of 0.1 bar.
  • Absolute pressure sensor E12 can be provided to include the ambient air pressure.
  • the analog value of the absolute pressure sensor E12 goes to the amplifier E13 and from there to the analog / digital converter E14.
  • the difference between the digital value of the ambient air pressure and the digital value of the absolute tire pressure is calculated in the microprocessor E4 and displayed on the display E15.
  • the time of day can be continuously formed and read into the microprocessor E4.
  • a memory E17 is assigned to the microprocessor E4.
  • the time of the measurement the identity of the tire tested, the measured tire pressure and further data (target pressure of certain tires) can be stored, which are entered with the aid of the further pushbuttons E3.
  • the control signal for the display E15 can be stored for a while with the memory E17.

Landscapes

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

Abstract

Une valve (4) et un élément de télécommande (50) entre lesquels des signaux sont transmis par des rayonnements électromagnétiques servent à mesurer et à indiquer la pression de gonflage d'un pneu (3). Un émetteur situé dans l'élément de télécommande (50) émet un signal d'actionnement. Un récepteur du signal d'actionnement, un dispositif d'actionnement, un capteur de la pression absolue, un dispositif émetteur et des circuits de génération et d'émission d'un signal correspondant à la pression de gonflage des pneus sont situés sur ou dans la valve (4). Le capteur de la pression absolue est un composant semi-conducteur et fournit un signal électrique de sortie correspondant à la pression réelle de gonflage du pneu. Un dispositif récepteur du signal de pression, un affichage à cristaux liquides et des circuits d'évaluation du signal de pression et de commande de l'affichage sont situés sur l'élément de télécommande (50).
PCT/EP1992/002377 1991-10-14 1992-10-14 Procede, dispositif et valve de mesure et d'indication de la pression de gonflage d'un pneu WO1993008035A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4133993A DE4133993C2 (de) 1991-10-14 1991-10-14 Vorrichtung zum Messen und Anzeigen des Druckes in einem Luftreifen
DE4133999A DE4133999C2 (de) 1991-10-14 1991-10-14 Ein Drucksignal erzeugendes Reifenventil
DEP4133999.1 1991-10-14
DEP4133993.2 1991-10-14

Publications (1)

Publication Number Publication Date
WO1993008035A1 true WO1993008035A1 (fr) 1993-04-29

Family

ID=25908209

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/002377 WO1993008035A1 (fr) 1991-10-14 1992-10-14 Procede, dispositif et valve de mesure et d'indication de la pression de gonflage d'un pneu

Country Status (1)

Country Link
WO (1) WO1993008035A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018018A1 (fr) * 1993-02-08 1994-08-18 Alpha-Beta Electronics Ag Valve avec un dispositif pour la production d'un signal de diminution de pression transmissible sans fil pour des pneumatiques de vehicules
EP0995619A1 (fr) * 1998-10-21 2000-04-26 LOUREIRO BENIMELI, Fermin, Jaime Dispositif permettant de contrôler la pression de gonflage de roues de véhicules automobiles équipés de pneumatiques et de véhicules similaires
GB2343253A (en) * 1998-08-04 2000-05-03 Csi Technology Inc Hand-held wireless collection of machine data
DE19939936A1 (de) * 1999-08-23 2001-03-08 Beru Ag Einrichtung zum Überwachen und drahtlosen Signalisieren des Drucks in Luftreifen an Fahrzeugen
ES2164509A1 (es) * 1998-10-21 2002-02-16 Benimeli Fermin Jaime Loureiro Dispositivo para el control de la presion en los neumaticos de automoviles y de vehiculos analogos.
EP2732988A1 (fr) * 2012-11-19 2014-05-21 Ateq Corporation Pneumatique pour véhicule et outil d'inspection de frein
US9050862B2 (en) 2011-10-26 2015-06-09 Ateq Corporation Universal tire pressure monitoring system tool and methods
US9539866B2 (en) 2012-11-02 2017-01-10 Ateq Corporation High volume vehicle inspection system and methods
US11400772B2 (en) 2020-02-26 2022-08-02 Ateq Scanning method and device for tire pressure monitoring system (tpms) protocols
US11845305B2 (en) 2020-04-29 2023-12-19 Ateq Device for electronic system for monitoring the pressure of the tyres of a motor vehicle
CN112918197B (zh) * 2017-08-21 2023-12-19 什拉姆有限责任公司 用于自行车车轮的压力感测组件

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010204A1 (fr) * 1978-09-27 1980-04-30 Hitachi, Ltd. Convertisseur semiconducteur de mesure de pression absolue
DE2850787A1 (de) * 1978-11-20 1980-06-04 Dennis G Pappas Reifendruck-alarmeinrichtung
EP0016991A2 (fr) * 1979-03-12 1980-10-15 Siemens Aktiengesellschaft Dispositif de surveillance de pression de pneumatique
US4308520A (en) * 1976-07-30 1981-12-29 Edcliff Instruments Tire pressure indicator
DE3600830C1 (en) * 1986-01-14 1987-07-09 Rainer Achterholt Tyre-pressure measuring and indicating device
US4918423A (en) * 1987-07-23 1990-04-17 Bridgestone Corporation Tire inspection device
US4938056A (en) * 1989-05-30 1990-07-03 The Uniroyal Goodrich Tire Company Determining the air permeability of a tire
DE3930479A1 (de) * 1989-09-12 1991-03-14 Rainer Achterholt Ventil mit signalerzeugungseinrichtung fuer fahrzeugreifen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308520A (en) * 1976-07-30 1981-12-29 Edcliff Instruments Tire pressure indicator
EP0010204A1 (fr) * 1978-09-27 1980-04-30 Hitachi, Ltd. Convertisseur semiconducteur de mesure de pression absolue
DE2850787A1 (de) * 1978-11-20 1980-06-04 Dennis G Pappas Reifendruck-alarmeinrichtung
EP0016991A2 (fr) * 1979-03-12 1980-10-15 Siemens Aktiengesellschaft Dispositif de surveillance de pression de pneumatique
DE3600830C1 (en) * 1986-01-14 1987-07-09 Rainer Achterholt Tyre-pressure measuring and indicating device
US4918423A (en) * 1987-07-23 1990-04-17 Bridgestone Corporation Tire inspection device
US4938056A (en) * 1989-05-30 1990-07-03 The Uniroyal Goodrich Tire Company Determining the air permeability of a tire
DE3930479A1 (de) * 1989-09-12 1991-03-14 Rainer Achterholt Ventil mit signalerzeugungseinrichtung fuer fahrzeugreifen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELECTRONIQUE INDUSTRIELLE Nr. 82, Februar 1985, Seiten 74 - 79 CATIER 'LA MESURE DES FORCES ET DES PRESSIONS' *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994018018A1 (fr) * 1993-02-08 1994-08-18 Alpha-Beta Electronics Ag Valve avec un dispositif pour la production d'un signal de diminution de pression transmissible sans fil pour des pneumatiques de vehicules
GB2343253B (en) * 1998-08-04 2000-10-25 Csi Technology Inc Apparatus and method for machine data collection
GB2343253A (en) * 1998-08-04 2000-05-03 Csi Technology Inc Hand-held wireless collection of machine data
ES2176047A1 (es) * 1998-10-21 2002-11-16 Benimeli Fermin Jaime Loureiro Dispositivo para el control de la presion en los neumaticos de automoviles y de vehiculos analogos.
ES2164509A1 (es) * 1998-10-21 2002-02-16 Benimeli Fermin Jaime Loureiro Dispositivo para el control de la presion en los neumaticos de automoviles y de vehiculos analogos.
EP0995619A1 (fr) * 1998-10-21 2000-04-26 LOUREIRO BENIMELI, Fermin, Jaime Dispositif permettant de contrôler la pression de gonflage de roues de véhicules automobiles équipés de pneumatiques et de véhicules similaires
DE19939936A1 (de) * 1999-08-23 2001-03-08 Beru Ag Einrichtung zum Überwachen und drahtlosen Signalisieren des Drucks in Luftreifen an Fahrzeugen
US9050862B2 (en) 2011-10-26 2015-06-09 Ateq Corporation Universal tire pressure monitoring system tool and methods
US9539866B2 (en) 2012-11-02 2017-01-10 Ateq Corporation High volume vehicle inspection system and methods
EP2732988A1 (fr) * 2012-11-19 2014-05-21 Ateq Corporation Pneumatique pour véhicule et outil d'inspection de frein
CN112918197B (zh) * 2017-08-21 2023-12-19 什拉姆有限责任公司 用于自行车车轮的压力感测组件
US11400772B2 (en) 2020-02-26 2022-08-02 Ateq Scanning method and device for tire pressure monitoring system (tpms) protocols
US11845305B2 (en) 2020-04-29 2023-12-19 Ateq Device for electronic system for monitoring the pressure of the tyres of a motor vehicle

Similar Documents

Publication Publication Date Title
EP0417712B1 (fr) Valve avec dispositif de signalisation pour pneus de véhicule
DE4303591C2 (de) Ventilkappe mit einer Einrichtung zur Erzeugung eines Druckanzeigesignals für einen mit einem Ventil ausgerüsteten Fahrzeugreifen
WO1993008035A1 (fr) Procede, dispositif et valve de mesure et d'indication de la pression de gonflage d'un pneu
EP0642426B1 (fr) Valve avec un dispositif pour la production d'un signal de diminution de pression transmissible sans fil pour des pneumatiques de vehicules
US5694111A (en) Tire pressure indicator
US5083457A (en) Remotely actuated tire pressure sensor
US5723870A (en) Fluid gauging apparatus using magnetostrictive sensor and stick gauge
DE102008035498A1 (de) Reifenmodul mit piezosensitivem Sensor
EP1355135A2 (fr) Appareil de détection pour fluides ,utilisant la magnétostriction et une jauge en forme de bâton
EP0690293A9 (fr) Appareil de détection pour fluides, utilisant la magnétostriction et une jauge en forme de bâton
US5814830A (en) Liquid gauging apparatus with a magnetoresistive sensor and remote sensor interrogration
DE4133999C2 (de) Ein Drucksignal erzeugendes Reifenventil
EP0626568B1 (fr) Jauge de liquide et capteur à interrogation à distance
DE2922910A1 (de) Anzeigevorrichtung fuer fahrzeuge
EP0724044A1 (fr) Dispositif de commande d'une armature sanitaire
EP0901881A2 (fr) Outil ou porte-outil
US7057520B1 (en) Mobile transponder for a motor vehicle
US20030102966A1 (en) Tire pressure sensing system
DE4133993C2 (de) Vorrichtung zum Messen und Anzeigen des Druckes in einem Luftreifen
EP1021312A1 (fr) Dispositif de commande de la luminance de l'eclairage des tableaux et instruments de bord d'un vehicule
DE19855977C2 (de) Objektiv für eine Kamera
DE19837151A1 (de) Mobiles, elektronisches Orientierungsmedium für hörbehinderte Passanten
WO1993008036A1 (fr) Procede, dispositif et capuchon de valve de mesure et d'indication de la pression de gonflage d'un pneu
DE102019004071A1 (de) Drucktaste
DE4133991C2 (de) Ein Drucksignal erzeugende Ventilkappe für einen mit einem Reifenventil ausgerüsteten Luftreifen

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL SE

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA