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WO2009015265A1 - Dispositif et procédé de surveillance de pneu - Google Patents

Dispositif et procédé de surveillance de pneu Download PDF

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Publication number
WO2009015265A1
WO2009015265A1 PCT/US2008/070999 US2008070999W WO2009015265A1 WO 2009015265 A1 WO2009015265 A1 WO 2009015265A1 US 2008070999 W US2008070999 W US 2008070999W WO 2009015265 A1 WO2009015265 A1 WO 2009015265A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
phase difference
antennas
radio waves
wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2008/070999
Other languages
English (en)
Inventor
Toshiaki Watasue
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.)
Texas Instruments Inc
Original Assignee
Texas Instruments Inc
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 JP2007193538A external-priority patent/JP2009029209A/ja
Application filed by Texas Instruments Inc filed Critical Texas Instruments Inc
Publication of WO2009015265A1 publication Critical patent/WO2009015265A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0415—Automatically identifying wheel mounted units, e.g. after replacement or exchange of wheels
    • B60C23/0416—Automatically identifying wheel mounted units, e.g. after replacement or exchange of wheels allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
    • 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
    • B60C23/0433—Radio signals
    • 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
    • B60C23/0433—Radio signals
    • B60C23/0435—Vehicle body mounted circuits, e.g. transceiver or antenna fixed to central console, door, roof, mirror or fender
    • B60C23/0444—Antenna structures, control or arrangements thereof, e.g. for directional antennas, diversity antenna, antenna multiplexing or antennas integrated in fenders

Definitions

  • the invention pertains to a tire monitoring device and a tire problem detecting device that can monitor the state of tires installed on the wheels of an automobile in a wireless form.
  • the invention pertains to technology that improves the function of identifying the installation position of each tire acting as a radio wave transmitter.
  • TPMS tire pressure monitoring system
  • FIGS. 9-11 show a conventional typical direct measurement type TPMS.
  • the TPMS shown in FIG. 9 has receiving antennas 104A, 104B, 104C, 104D with relatively low sensitivity arranged in wheel housings or at other places close to tires 102FL, 102FR, 102RL, 102RR installed on automobile 100.
  • Each of receiving antennas 104A-104D is connected to receiver 106 via respective power supply lines.
  • Tires 102FL, 102FR, 102RL, 102RR are equipped with various kinds of sensors used for detecting air pressure, temperature, etc., of the corresponding tires and sensor modules 108A, 108B, 108C, 108D having transmitters, etc., that transmit the data of the sensor measurement results through radio waves with a certain frequency (such as 315 MHz), respectively.
  • receiver 106 selects the radio waves input from one of receiving antennas 104A-104D, the sensor module 108 corresponding to or close to that receiving antenna 104 is selected, and the tire state information (air pressure measurement value, temperature measurement value, etc.) sent through a wireless RF signal from said sensor module 108 is input and demodulated. If the measurement value is outside an allowed range, it means that the corresponding tire 102 has a problem or is abnormal, and a warning will be sent through display 110 in the automobile.
  • the TPMS shown in FIG. 10 has starting antennas HOA, HOB, HOC, HOD arranged close to tires 102FL, 102FR, 102RL, 102RR, respectively, and has only one receiving antenna 104.
  • Each of said starting antennas 11 OA-11OD and receiving antenna 104 are connected to receiver 106 via respective power supply lines.
  • Receiver 106 operates starting antenna 110 close to selected tire 102 in order to monitor the state of each of tires 102FL-102RR.
  • a start signal or request signal with a low frequency (for example, 125 kHz) is supplied to the sensor module 108 of that tire 102 using the electromagnetic induction method, and the tire state information transmitted wirelessly (RF signal) from the corresponding sensor module 108 is input corresponding to said request signal.
  • the TPMS shown in FIG. 11 does not have antennas arranged close to tires 102FL, 102FR, 102RL, 102RR and has only one receiving antenna 104. In this case, however, ID information transmitted together with the tire state information from the sensor module 108 of each tire 102 is set and registered in receiver 106 in relation to the installation position of the corresponding tire 102. Receiver 106 demodulates the radio waves received by receiving antenna 104 and reads the ID. In this way, it is possible to determine the wheel position where tire 102 is installed as the radio wave transmitter based on the set registration information.
  • An object of the invention is to solve the problems of the aforementioned conventional technology by providing a tire monitoring device and a tire problem detecting device, which have a simple configuration and compact size, require no special means or operation during operation, and can accurately identify the wheel position where each tire as a radio wave transmitter is installed.
  • a tire monitoring device that monitors the state of tires based on information included in radio waves transmitted from sensor modules equipped by the tires installed on the wheels of an automobile. It has first and second antennas installed at different positions on the body of said automobile to receive the radio waves transmitted from said sensor modules with a phase difference between them, a received radio wave phase difference detector that detects the phase difference between the radio waves received by the first and second antennas, and a tire wheel position judging part that judges the wheel position where a tire is installed as the transmitter of said radio waves based on the phase difference between said received radio waves.
  • common first and second antennas are arranged in a prescribed positional relationship on all the tires installed on an automobile.
  • Numerous equal phase difference curves are defined unambiguously in a profile corresponding to the wavelength of the radio waves and the distance between the two antennas.
  • each wheel of the automobile is arranged on a prescribed equal phase difference curve based on the relative position with respect to the two antennas.
  • the position of the radio wave transmitter on the equal phase difference curve can be calculated from the phase difference between the radio waves received by the two antennas obtained by the received radio wave phase difference detector. It is possible to determine the wheel position where the tire as the radio wave transmitter is installed in the tire wheel position judging part.
  • said first and second antennas are arranged in a prescribed positional relationship such that different wheels of said automobile are set at different positions on equal phase difference curves specified between the first and second antennas and around them.
  • said first and second antennas are arranged such that the straight line connecting the first and second antennas is neither parallel with nor perpendicular to but is inclined by a prescribed angle with respect to each side of the quadrilateral that connects the center of each of the four wheels of said automobile.
  • said first and second antennas are arranged such that the straight line connecting the first and second antennas is parallel with the width direction of said automobile and is offset in the length direction of said automobile toward the front wheels or rear wheels from the center of the quadrilateral that connects the center of each of the four wheels of said automobile.
  • said first and second antennas are arranged such that the straight line connecting the first and second antennas is parallel with the length direction of said automobile and is offset in the width direction of said automobile toward the left wheels or right wheels from the center of the quadrilateral that connects the center of each of the four wheels of said automobile.
  • said first and second antennas are arranged in a prescribed positional relationship such that the front and rear wheels of said automobile are set at different positions on equal phase difference curves specified between the first and second antennas and around them.
  • the sensor module equipped by each tire include a rotation direction sensor that can detect whether the rotation direction of that tire is clockwise or counterclockwise from the shaft of the wheel in order to determine whether the tire as the radio wave transmitter is the left wheel or right wheel.
  • said first and second antennas are arranged in a prescribed positional relationship such that the left and right wheels of said automobile are set at different positions on equal phase difference curves specified between the first and second antennas and around them.
  • the means used for judging whether the tire as the radio wave transmitter is installed on a front wheel or a rear wheel be provided separately.
  • said sensor module includes a pressure sensor that detects the air pressure of the tire, a temperature sensor that detects the temperature of the tire, etc. Also, it is preferred that the first and second antennas be arranged at a distance shorter than the wavelength of said radio waves, especially, at a distance equal to 1 A of the wavelength of said radio waves.
  • said received radio wave phase difference detector has a first intermediate frequency converting circuit that converts the radio waves received by the first antenna to a first intermediate frequency signal having a prescribed intermediate frequency lower than the frequency of said radio waves, a first amplifier circuit that amplifies the first intermediate frequency signal, a second intermediate frequency converting circuit that converts the radio waves received by the second antenna to a second intermediate frequency signal having said intermediate frequency, a second amplifier circuit that amplifies said second intermediate frequency signal, and a phase detecting circuit that detects the phase difference between the first intermediate frequency signal output from the first amplifier circuit and the second intermediate frequency signal output from the second amplifier circuit.
  • said wheel judging part has a phase difference reference value setting part that sets and stores a phase difference reference value for each wheel in advance based on equal phase difference curves specified between the first and second antennas and a judging part that compares the detected phase difference value between the received radio waves obtained from said received radio wave phase difference detector with the phase difference reference value of each wheel, determines the phase difference reference value closest to said detected phase difference value, and judges the wheel corresponding to said determined phase difference reference value as the wheel whereon the tire of said radio wave radiation source is installed.
  • An aspect of the tire problem detecting device disclosed in the invention can detect a prescribed problem when it occurs on a tire installed on any wheel of an automobile based on the information included in the radio waves transmitted from a sensor module equipped by said tire.
  • first and second antennas installed at different positions on the body of said automobile to receive the radio waves transmitted from said sensor module with a phase difference between them, a phase difference detector that detects the phase difference between the radio waves received by the first and second antennas, and a problem tire wheel position identification part that can identify which wheel has the tire with said prescribed problem.
  • FIG. 1 is a plan view schematically illustrating the overall configuration of a TPMS disclosed in an embodiment of the invention.
  • FIG. 2 is a diagram illustrating a configuration example that combines the receiving antennas and the receiver in one unit in the TPMS of said embodiment.
  • FIG. 3 is a diagram illustrating a configuration example that loads the receiving unit shown in FIG. 2 in an automobile.
  • FIG. 4 is a block diagram illustrating a circuit configuration example of the receiver in the TPMS of the embodiment.
  • FIG. 5 is a diagram illustrating the antenna arrangement according to an embodiment and the equal phase difference curves between the two antennas.
  • FIG. 6 is a partial enlarged view that enlarges a part of FIG. 5.
  • FIG. 7 is a diagram illustrating the antenna arrangement according to another embodiment and the equal phase difference curves between the two antennas.
  • FIG. 8 is a diagram illustrating the antenna arrangement according to yet another embodiment and the equal phase difference curves between the two antennas.
  • FIG. 9 is a diagram illustrating a conventional example of a direct measurement type
  • FIG. 10 is a diagram illustrating another conventional example of a direct measurement type TPMS.
  • FIG. 11 is a diagram illustrating yet another conventional example of a direct measurement type TPMS. REFERENCE NUMERALS AND SYMBOLS AS SHOWN IN THE DRAWINGS
  • 10 represents an automobile, FL a front left wheel, FR a front right wheel, RL a rear left wheel, RR a rear right wheel, 12FL a front left wheel tire, 12FR a front right wheel tire, 12RL a rear left wheel tire, 12RR a rear right wheel tire, 14A, 14B, 14C, 14D a sensor module, 16 a main device, 18, 20 a receiving antenna, 22 a receiver, 24 a display, 26 a receiving unit, 30, 32 a mixing circuit, 34 a local oscillating circuit, 36, 38 an intermediate frequency amplifier circuit, 40, 42 a discriminator circuit, 44 a phase detecting circuit, 46 a signal processing circuit.
  • the tire monitoring device and tire problem detecting device of an aspect of the invention are simple and compact and require no special means or operation during application and can accurately identify the wheel position where each tire or a tire with a problem acting as a radio wave transmitter is installed.
  • FIG. 1 shows the overall configuration of the TPMS disclosed in an embodiment of the invention.
  • Said TPMS is constituted as a direct measurement type wireless transmission- receiving device. It has sensor modules 14A, 14B, 14C, 14D on the transmission side equipped by tires 12FL, 12FR, 12RL, 12RR installed on a four-wheel automobile 10 as well as main device 16 on the receiving side installed or loaded as the TPMS main body in automobile 10.
  • Each sensor module 14 may have any configuration/function as long as it is of the direct measurement type. For example, it can have various kinds of sensors used for detecting the air pressure, temperature, power supply voltage, etc., of the corresponding tire and a transmitter, etc., that transmits the data of the sensor measurement result through radio waves with a certain frequency (for example, 315 MHz).
  • the sensor module is installed or incorporated integrally in the plug of the corresponding tire.
  • Main device 16 is comprised of two receiving antennas 18, 20, receiver 22, and display 24.
  • Said two receiving antennas 18, 20 are installed, for example, on the bottom of the body within the frame of quadrilateral S that connects the four wheels (FL, FR, RL, RR) of automobile 10 so that they can receive the radio waves transmitted from each of sensor modules 14A, 14B, 14C, 14D with a phase difference.
  • Receiver 22 is connected to two antennas 18, 20 via power supply lines 26, 28. It can be installed at any position in the body or in the automobile compartment.
  • Display 24 can use any display device or display element, such as a liquid crystal display or light emitting diode (lamp). It is usually installed on the driver's side in the automobile compartment.
  • Receiver 22 is installed near the central position between two antennas 18, 20. It is also possible to arrange the signal processing part of the back end in the empty space above unit 26.
  • receiving unit 26 can be installed on the bottom of the body of automobile 10 at a prescribed position in a prescribed direction as shown in FIG. 3.
  • FIG. 4 shows a circuit configuration example of receiver 22.
  • Said receiver 22 has mixing circuits 30, 32, local oscillator circuit 34, intermediate frequency amplification circuits 36, 38 at the front end and has discriminator circuits 40, 42, phase difference detecting circuit 44, and signal processing circuit 46 at the back end.
  • the first mixing circuit 30 mixes the local oscillator signal output from local oscillating circuit 34 with the RF signal of the radio waves received by or input to the first antenna 18 and outputs a first intermediate frequency signal having a frequency (intermediate frequency) equal to the difference between the frequencies of said two signals.
  • the first intermediate frequency signal is amplified at a prescribed gain by the first intermediate frequency amplification circuit 36 and is then input into the first discriminator circuit 40 and phase detecting circuit 44.
  • the second mixing circuit 32 mixes the local oscillator signal output from local oscillating circuit 34 with the RF signal of the radio waves received by or input to the second antenna 20 and outputs a second intermediate frequency signal having said intermediate frequency.
  • the second intermediate frequency signal is amplified at a prescribed gain by the second intermediate frequency amplification circuit 38 and is then input into the second discriminator circuit 42 and phase difference detecting circuit 44.
  • the first and second discriminator circuits 40, 42 demodulate with a prescribed data transmission method, for example, FSK (frequency shift keying), the first and second intermediate frequency signals and send the output digital signals to signal processing circuit 46.
  • a prescribed data transmission method for example, FSK (frequency shift keying)
  • the contents of the data obtained by detecting and demodulating them are also common. Consequently, it is also possible to only input one of the output signals of two discriminator circuits 40, 42 into signal processing circuit 46.
  • Phase detecting circuit 44 detects the phases of the first and second intermediate frequency signals and compares the two phases to detect the difference (phase difference) and supplies the phase difference detection value to signal processing circuit 46.
  • the phase difference between the two radio waves can be derived from the phase difference between the first and second intermediate frequency signals.
  • Signal processing circuit 46 can be constituted by a CPU (central processing unit) or DSP (digital signal processor). It compares the tire state information (air pressure measurement value, temperature measurement value, voltage measurement value, etc.) included along with the tire ID information in the demodulated data with each monitor reference voltage (reference air pressure, reference temperature, reference voltage, etc.) to determine whether the concerned tire operates normally and sends the judgment result to the user (driver) through display 24. Signal processing circuit 46 determines the wheel position (FL, FR, RL, or RR) where tire 12 as the radio wave transmitter is installed based on the phase difference detection value input from phase detecting circuit 44 and phase difference set registration information to be described later and displays said wheel position on display 24. In this way, if the air pressure drops below the safe reference value in one tire, for example, tire 12FR, the wheel position of tire 12FR (that is, front right wheel RF) can be notified along with said problem situation (insufficient air pressure) to the driver.
  • a CPU central processing unit
  • DSP digital signal processor
  • the equal phase difference curve with phase difference of O ⁇ is specified on the straight line that crosses perpendicular to the straight line L formed by connecting two antennas 18, 20 and passes through central point C. Then, as the phase difference increases in the positive direction as 0.05 ⁇ — » O.l ⁇ — > 0.15 ⁇ — > ... 0.4 ⁇ — > 0.45 ⁇ , the equal phase difference curve is bent at bigger curvature and approaches the side of antenna 18. As the phase difference increases in the negative direction as -0.05 ⁇ — > -O.l ⁇ — > -0.15 ⁇ — > ...
  • the equal phase difference curve is bent at high curvature and approaches the side of antenna 20.
  • All the equal phase difference curves cross the straight line L that connects two antennas 18, 20.
  • two antennas 18, 20 are arranged such that straight line L that connects two antennas 18, 20 inclines at an appropriate angle without being parallel with or perpendicular to any side of quadrilateral S within the area of quadrilateral S that connects four wheels (FL, FR, RL, RR) of automobile 10. Also, the central point C between two antennas 18, 20 is consistent with the central point M of quadrilateral S.
  • front left wheel FL is positioned in the range of about [0 ⁇ to 0.25 ⁇ ]
  • front right wheel FR is positioned in the range of about [-0.3 ⁇ to -0.45 ⁇ ]
  • rear left wheel RL is positioned in the range of about [0.3 ⁇ to 0.4 ⁇ ]
  • rear right wheel RR is positioned in the range of about [0 ⁇ to -0.15 ⁇ ].
  • the positions of four wheels (FL, FR, RL, RR) on the equal phase difference curves are set appropriately so that they do not superimpose with each other even partially.
  • the setting content that is, the position information of each wheel on the equal phase difference curves is registered (stored) as one piece of setting information in the memory of receiver 22.
  • phase difference of the radio waves (RF signals) received by two antennas 18, 20 are detected by phase detecting circuit 44 as described above, and the value of the phase difference is supplied to signal processing circuit 46.
  • the detected value of the phase difference obtained by phase detecting circuit 44 also varies periodically within a certain range.
  • Signal processing circuit 46 compares the phase difference detected value received from phase detecting circuit 44 with each piece of wheel position information on the equal phase difference curves registered in the memory and derives the wheel position set in the phase difference range that is closest to the phase difference detected value (strictly speaking, said periodically varying range). For example, if the phase difference detected value sent from phase detecting circuit 44 varies near -0.35 ⁇ , the radio wave transmitter can be identified as tire 12FR (sensor module 14B) of front right wheel FR. Then, if, for example, the tire air pressure in the tire state information supplied from discriminator circuit 40, 42 falls below the safety reference value, the fact that a problem of insufficient air pressure occurs in the tire 12FR of front right wheel FR can be notified instantaneously to the driver through display 24.
  • Signal processing circuit 46 can also perform statistical processing or averaging processing for each tire (ID) for the phase difference detected value received from phase detecting circuit 44 to improve the accuracy and reliability of the phase difference detected value regarding each tire.
  • an antenna does not have to be installed near tires 12FL, 12FR, 12RL, 12RR. Only a group of two (18, 20) antennas are used commonly for all the tires, and work during operation is not necessary. In particular, registration of the position of a wheel whereon a new tire is installed corresponding to the tire ID is not necessary when a tire is replaced on any of four wheels (FL, FR, RL, RR).
  • FIGS. 7, 8 show other embodiments regarding the arrangement of two antennas 18, 20 in these embodiments.
  • two antennas 18, 20 are arranged such that straight line L that connects two antennas 18, 20 is parallel with the width direction of automobile 10 and is offset in the length direction toward the rear wheels from the central point M of the four wheels.
  • front left wheel FL is positioned in the range of about [0. l ⁇ to 0.2 ⁇ ]
  • front right wheel FR is positioned in the range of about [-0. l ⁇ to -0.2 ⁇ ]
  • rear left wheel RL is positioned in the range of about [0.3 ⁇ to 0.45 ⁇ ]
  • rear right wheel RR is positioned in the range of about [-0.3 ⁇ to -0.45 ⁇ ].
  • the positions of four wheels (FL, FR, RL, RR) on the equal phase difference curves are also set without partial superimposition. Consequently, during operation, the same effect as that of said receiver 22 can be realized.
  • said two antennas 18, 20 can be arranged such that the straight line L that connects two antennas 18, 20 is offset toward the front wheels from the central point M of the four wheels.
  • two antennas 18, 20 are arranged such that the straight line L that connects two antennas 18, 20 is parallel with the length direction of automobile 10 and is offset in the width direction toward the left wheels or right wheels from the central point M of the four wheels.
  • two antennas 18, 20 are arranged such that the front wheels (FL, FR) and rear wheels (RL, RR) of the automobile are set at different positions on the equal phase difference curves specified between two antennas 18, 20.
  • the straight line L that connects antennas 18, 20 is parallel with the length direction of automobile 10, and the central point C of straight line L is consistent with the central point M of the four wheels.
  • both front left wheel FL and front right wheel FR are positioned close to the range of about [-0.4 ⁇ to -0.45 ⁇ ]
  • both rear left wheel RL and rear right wheel RR are positioned close to the range of about [0.4 ⁇ to 0.45 ⁇ ].
  • the positions of front wheels (FL, FR) and the positions of rear wheels (RL, RR) on the equal phase difference curve are set without superimposition between them.
  • signal processing circuit 46 can judge or distinguish whether the tire of the radio wave transmitter is front wheel (FL, FR) or rear wheel (RL, RR) by comparing the phase difference detected value supplied from phase detecting circuit 44 with the set registered information regarding each wheel position on the equal phase difference curves.
  • the direct measurement type sensor module may also include a rotation direction sensor that detects the rotation direction of the concerned tire (clockwise direction or counterclockwise direction viewed from the shaft of the wheel) by using a pair of gravity detecting sensors and sends the detected rotation direction along with other tire state information, such as tire air pressure or tire temperature.
  • signal processing circuit 46 can extract the information of the tire rotation direction from the data received from discriminator circuit 40, 42, identify the rotation direction of the tire as the radio wave transmitter, and determine whether the concerned tire is a left wheel or right wheel. In this way, it is possible to determine or distinguish which of the four wheels (FL, FR, RL, RR) is the installation location of the tire as the radio wave transmitter based on the received radio wave phase difference information and the tire rotation direction.
  • two antennas 18, 20 can be arranged such that the left wheels (FL, RL) and right wheels (FR, RR) of the automobile are set at different positions on the equal phase difference curves specified between two antennas 18, 20.
  • the distance D between two antennas 18, 20 is set at 1 A wavelength of the radio waves in the aforementioned embodiments.
  • Said distance can also be set differently, preferably, in the range of 0 ⁇ D ⁇ .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un dispositif permettant d'identifier précisément la position d'une roue, chaque pneu étant muni d'un émetteur d'onde radio de configuration simple et compacte dont l'installation ne requiert aucune opération ni moyen spécial. Ce TPMS comporte des modules de capteur (14A, 14B, 14C, 14D) sur le côté transmission équipés de pneus (12FL, 12FR, 12RL, 12RR) installés sur une automobile (10) et un dispositif principal (16) sur le côté récepteur chargé dans une automobile. Le dispositif principal (16) est composé d'un groupe de deux antennes (18, 20), d'un récepteur (22) et d'un système d'affichage (24). Deux antennes sont agencées de façon appropriée pour recevoir les ondes radios transmises par chacun des modules de capteur et espacées par une différence de phase.
PCT/US2008/070999 2007-07-25 2008-07-24 Dispositif et procédé de surveillance de pneu Ceased WO2009015265A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2007-193538 2007-07-25
JP2007193538A JP2009029209A (ja) 2007-07-25 2007-07-25 タイヤ監視装置及びタイヤ不具合検出装置
US12/177,683 US7944348B2 (en) 2007-07-25 2008-07-22 Tire monitoring device and tire problem detecting device
US12/177,683 2008-07-22

Publications (1)

Publication Number Publication Date
WO2009015265A1 true WO2009015265A1 (fr) 2009-01-29

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PCT/US2008/070999 Ceased WO2009015265A1 (fr) 2007-07-25 2008-07-24 Dispositif et procédé de surveillance de pneu

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102712228A (zh) * 2010-01-21 2012-10-03 法国欧陆汽车公司 用于定位和检测汽车车轮的位置的方法
AU2009332075B2 (en) * 2008-12-26 2014-05-01 Sharp Kabushiki Kaisha Mobile station apparatus, management method in a mobile station apparatus, processing section, base station apparatus and communication system
CN109808428A (zh) * 2017-11-21 2019-05-28 福特全球技术公司 用于车辆胎压监测系统定位的系统和方法
US20220234398A1 (en) * 2021-01-28 2022-07-28 Chih-Wei YU Multi-antenna tire-pressure monitoring system with automatically positioning function
FR3131560A1 (fr) * 2022-01-03 2023-07-07 Continental Automotive Procédé pour la localisation des roues d’un véhicule automobile

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Publication number Priority date Publication date Assignee Title
JP2003237329A (ja) * 2002-02-19 2003-08-27 Mazda Motor Corp 自動車の空気圧警報装置
US20040017290A1 (en) * 2000-11-10 2004-01-29 Michelin Recherche Et Technique S.A. & Cie. System for monitoring the tires of a vehicle, comprising a device for automatic location of wheel transmitters
JP2005088781A (ja) * 2003-09-18 2005-04-07 Hino Motors Ltd タイヤ空気圧警報装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040017290A1 (en) * 2000-11-10 2004-01-29 Michelin Recherche Et Technique S.A. & Cie. System for monitoring the tires of a vehicle, comprising a device for automatic location of wheel transmitters
JP2003237329A (ja) * 2002-02-19 2003-08-27 Mazda Motor Corp 自動車の空気圧警報装置
JP2005088781A (ja) * 2003-09-18 2005-04-07 Hino Motors Ltd タイヤ空気圧警報装置

Cited By (7)

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AU2009332075B2 (en) * 2008-12-26 2014-05-01 Sharp Kabushiki Kaisha Mobile station apparatus, management method in a mobile station apparatus, processing section, base station apparatus and communication system
CN102712228A (zh) * 2010-01-21 2012-10-03 法国欧陆汽车公司 用于定位和检测汽车车轮的位置的方法
US9020777B2 (en) 2010-01-21 2015-04-28 Continental Automotive France Method for locating and detecting the position of the wheels of a vehicle
CN109808428A (zh) * 2017-11-21 2019-05-28 福特全球技术公司 用于车辆胎压监测系统定位的系统和方法
US20220234398A1 (en) * 2021-01-28 2022-07-28 Chih-Wei YU Multi-antenna tire-pressure monitoring system with automatically positioning function
US11760137B2 (en) * 2021-01-28 2023-09-19 Sysgration Ltd. Multi-antenna tire-pressure monitoring system with automatically positioning function
FR3131560A1 (fr) * 2022-01-03 2023-07-07 Continental Automotive Procédé pour la localisation des roues d’un véhicule automobile

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