EP1214206A1 - Dispositif pour la surveillance et la signalisation sans fil de la pression dans des pneus de vehicules automobiles - Google Patents

Dispositif pour la surveillance et la signalisation sans fil de la pression dans des pneus de vehicules automobiles

Info

Publication number
EP1214206A1
EP1214206A1 EP00956348A EP00956348A EP1214206A1 EP 1214206 A1 EP1214206 A1 EP 1214206A1 EP 00956348 A EP00956348 A EP 00956348A EP 00956348 A EP00956348 A EP 00956348A EP 1214206 A1 EP1214206 A1 EP 1214206A1
Authority
EP
European Patent Office
Prior art keywords
pressure
wheel electronics
wheel
signals
vehicle
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Withdrawn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
EP00956348A
Other languages
German (de)
English (en)
Inventor
Norbert Normann
Andreas Kühnle
Gunter Lothar Schulze
Ralf Kessler
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.)
BorgWarner Ludwigsburg GmbH
Original Assignee
Beru 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 Beru AG filed Critical Beru AG
Publication of EP1214206A1 publication Critical patent/EP1214206A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • 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

Definitions

  • the receiving device is a loose remote control device, which contains an interrogation transmitter, with which the wheel electronics can be returned to their normal operating state from an energy-saving state, in which a receiving device and an activation device present in the wheel electronics are kept in standby mode.
  • the wheel electronics then measure the pressure and send a signal, which contains information about the absolute pressure, to the remote control device, which has a liquid crystal display on which the measured value can be read.
  • a sequence control ensures a short-term transmission of the pressure signal.
  • the wheel electronics are then restored to their energy-saving state, in which they consume a few microamps of electricity.
  • a dangerous situation for the driver is the occurrence of a sudden loss of pressure, which can only be recognized if the tire pressure is measured at intervals of only a few seconds.
  • the tire pressure is not sent every time it is measured, but only when a pressure deviation that affects driving safety becomes apparent, or when the wheel electronics function properly internally from time to time the wheel electronics are checked and reported to the receiving device.
  • DE 195 22486 C2 company lettering AMI DODUCO "Electronic tire pressure control system. More driving safety - more comfort").
  • a transponder or responder is a radio device that does not have its own power supply, transmits response signals to received query signals and the energy required for this from the query signals themselves refers.
  • an interrogator in the vehicle which transmits the interrogation signals
  • a response receiver which receives the response signals emitted by the transponder.
  • the interrogator and the response receiver are combined in a transceiver, which is connected to a vehicle with four wheels with four antennas which are arranged in the wheel arches of the body close to the wheels.
  • the power consumption of the wheel electronics in the energy-saving state could be reduced to less than 1 ⁇ A.
  • a separate antenna in the wheel arch is no longer required for each wheel to transmit the query signals. This saves considerable costs for antennas and their installation. Since you no longer need your own antenna in each wheel arch, you no longer have to run a high-frequency line in each wheel arch. Instead, one or two antennas can be used, which can be arranged in the center of the vehicle.
  • the receiver which is assigned to the wheel electronics, does not draw any current from the battery of the wheel electronics. This is because, as is customary with transponders, the receiver does not require any electrical current in order to be kept on standby for the reception of an interrogation signal.
  • the wheel electronics are connected upstream of a receiving circuit that does not consume any electricity, the wheel electronics, unlike in the case of WO / 9308035, does not have to receive a radio signal in one
  • the wheel electronics are not queried, which saves a considerable amount of electricity once again, because most vehicles are idle for more than 90% of their lifespan. In this way, the active operation of the wheel electronics is limited to the operating times of the vehicle.
  • Non-operating pressure drops in a tire that are relevant for driving safety are nevertheless recorded and signaled.
  • the interrogation transmitter is switched on when the ignition is switched on or already when the vehicle is unlocked, whereupon he immediately interrogates the wheel electronics and has the opportunity to take a critical look
  • the radio signals are weak to save energy. Due to the low signal level on the electrical lines between the receiving antennas and the central receiving, evaluating and control device, the electrical lines require complex measures to protect the signals transmitted on these lines against external interference. In a practical tire pressure control system according to DE 195 18806 A1, the electrical lines are elaborately shielded twisted pair cables.
  • the transmission powers of the interrogation transmitter and the wheel electronics are sufficient to manage the four wheels of a vehicle with a common central antenna for the transmission of the interrogation signals and the reception of the pressure signals.
  • the requirement that the receiving device must be able to recognize from the signals transmitted by the radio electronics at which point on the vehicle the wheel from which a signal was received can arise as a boundary condition.
  • DE 198 56 861 A1 discloses how acceleration sensors can be used in the wheel electronics, even if each wheel is not adjacent to it Antenna is provided in the wheel house, but only two or even only one antenna is present, can draw clear conclusions about the wheel position.
  • ⁇ p 0 10 to 100 mbar (10 3 to 40 4 N / m 2 )
  • the transmitter is activated and the pressure signal is sent to the receiving device.
  • t must be reduced in accordance with the same pressure drop rate of the threshold value. Because of the limited sensitivity of the pressure sensor, this will generally not be possible to the extent required. It is, therefore, continue to use cheaper in this case as a comparison pressure signal, the last before the shortening of the time clock from t "t, the comparison pressure signal formed until the specified number of measurements with a higher measuring rate ended or the measuring rate back to its original value (timing to) was extended.
  • Timing t Another possibility is to send a pressure signal at an increased measuring rate (timing t,) whenever the pressure measured value has changed by a certain amount, for example by 10 to 100 mbar. If no change in the pressure is detected (pressure change smaller than the threshold value ⁇ p 0 ), then measurement is continued for a certain time with an increased measuring rate (time cycle t,) or a predetermined number of measured values recorded with the increased measuring rate (timing t,) and then switched back to the original low measuring rate (timing t g ).
  • the pressure change occurs so quickly that the threshold value (between 10 and 100 mbar) is regularly exceeded at a normal measuring rate (time intervals t, between 1 and 10 seconds).
  • the procedure can therefore be the same as for rapid pressure loss. Since the filling process is generally not critical, there is also the possibility that a pressure measurement signal is not sent out until the tire pressure has stabilized again, which indicates the completion of the filling process.
  • the wheel electronics can also be arranged in a recess in this plastic ring.
  • FIG. 2 is a block diagram of a receiving device provided in the vehicle and
  • Figure 3 is a block diagram of a wheel electronics in connection with a
  • the wheel electronics 3 consists of an assembly 20, which contains an integrated pressure and temperature sensor with associated measurement, evaluation and control circuit, an HF stage 21, a radio antenna 22 and an electric battery 24, which supplies the module 20 and the HF stage 21 with current.
  • the HF stage 21 feeds the assembly 20 and the HF stage 21 with current.
  • the receiving device 9 and with it the interrogation transmitter 14 is switched on, which generates an interrogation signal at time intervals T 0 of, for example, 5 minutes, and this via the modulator / demodulator 12, the HF stage 11 and the antennas 6 and 7 emits.
  • This interrogation signal is received at each of the wheels 1 by the local receiving antenna 23 and activates the receiver 4 with the energy transmitted by the interrogation signal, so that the latter outputs a trigger signal to the module 20 via the trigger circuit 25.
  • This is then switched to its normal operating state and kept in its normal operating state for a predetermined period of time T, ⁇ T 0 , during which an internal clock is running in the module 20.
  • the signal emitted by the radio antenna 22 is received primarily by the closest of the two antennas 6 and 7, fed to the receiving device 9 via the line 8, reaches the two-channel RF stage 11, is demodulated in the modulator / demodulator 12 and by the Microprocessor 13 processed.
  • the microprocessor 13 controls the BUS driver 15, which then transmits a display signal generated by the microprocessor 13 to the display unit 17, on which it is used, for. B. is displayed on a liquid crystal display.
  • Suitable transponders are available from AmaTech Electronic Components Manufacturing GmbH, Roßbergweg 2 in 87459 Pfronten; AmaTech offers them for contactless identification systems, especially for installation in identity cards in credit card format.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne un dispositif servant à la surveillance et la signalisation sans fil d'une pression ou d'une variation de pression dans des pneus de roues (1) sur des véhicules automobiles (2). Le dispositif selon l'invention est constitué d'un récepteur (9) situé dans ou sur le véhicule (1) et auquel au moins une antenne (6, 7) est associée, ainsi que d'un appareil (3) - désigné par la suite par </= électronique de roue >/= - logé dans le pneu et servant à mesurer, évaluer et émettre des signaux de pression de pneu. Cette électronique de roue contient une batterie (24) qui sert de source de courant, un capteur de pression qui enregistre la pression existant dans le pneu, un circuit d'évaluation qui évalue les signaux de mesure de pression fournis par le capteur de pression, ainsi qu'un émetteur (21) qui est commandé par le circuit d'évaluation et qui transmet au récepteur (9) des signaux contenant une information sur la pression dans le pneu ou sur l'état de l'électronique de roue (3). Le dispositif selon l'invention est caractérisé en ce que l'électronique de roue (3) est activée à des intervalles de temps (T0) pour une durée (T1) inférieure à ces intervalles de temps (T0) et est maintenue sinon dans un état d'économie de courant.
EP00956348A 1999-08-23 2000-07-28 Dispositif pour la surveillance et la signalisation sans fil de la pression dans des pneus de vehicules automobiles Withdrawn EP1214206A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19939936 1999-08-23
DE19939936A DE19939936A1 (de) 1999-08-23 1999-08-23 Einrichtung zum Überwachen und drahtlosen Signalisieren des Drucks in Luftreifen an Fahrzeugen
PCT/EP2000/007340 WO2001017804A1 (fr) 1999-08-23 2000-07-28 Dispositif pour la surveillance et la signalisation sans fil de la pression dans des pneus de vehicules automobiles

Publications (1)

Publication Number Publication Date
EP1214206A1 true EP1214206A1 (fr) 2002-06-19

Family

ID=7919319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00956348A Withdrawn EP1214206A1 (fr) 1999-08-23 2000-07-28 Dispositif pour la surveillance et la signalisation sans fil de la pression dans des pneus de vehicules automobiles

Country Status (5)

Country Link
US (1) US6828905B2 (fr)
EP (1) EP1214206A1 (fr)
JP (1) JP2003508298A (fr)
DE (1) DE19939936A1 (fr)
WO (1) WO2001017804A1 (fr)

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US20020113692A1 (en) 2002-08-22
DE19939936A1 (de) 2001-03-08
JP2003508298A (ja) 2003-03-04
WO2001017804A1 (fr) 2001-03-15
US6828905B2 (en) 2004-12-07

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