Abstract: An antenna core produced by shaping a soft magnetic metal powder with the use of a resin as a binder, wherein the soft magnetic metal powder is an amorphous soft magnetic metal powder or a nanocrystal-containing amorphous soft magnetic metal powder, of the general formula (1): (Fe1-x-yCoxNiy)100-a-b-cSiaBbMc (1), and wherein the resin as a binder is a thermosetting resin. In the formula, M is at least one element selected from the group consisting of Nb, Mo, Zr, W, Ta, Hf, Ti, V, Cr, Mn, Y, Pd, Ru, Ga, Ge, C, P, Al, Cu, Au, Ag, Sn and Sb. Each of x and y is an atomic ratio and each of a, b and c an atomic %, satisfying the relationships: 0?x?1.0, 0?y?0.5, 0?x+y?1.0, 0?a?24, 1?b?30, 0?c?30 and 2?a+b?30.

Abstract: A first trigger unit and a second trigger unit output trigger signals to transceivers disposed for the four wheels of a vehicle. The first and second trigger units are attached to wall surfaces of tire housings corresponding to the left front and left rear wheels respectively. Each of the first and second trigger units is arranged in a position of the wall surface having an angle from 5 to 25 degrees with respect to the side of the corresponding wheel. Transceivers attached to a right front and right rear wheels are thus located farther from the trigger units than the left front and left rear wheels, respectively. Such arrangement allows the transceivers attached to the right front and right rear wheels to receive the outputted trigger signals with sufficient accuracy due to high field strength.

Abstract: A tire pressure monitoring system includes tire-based transmitting and receiving devices and a vehicle body-based transmitting and receiving device having vehicle body-based receiving means, vehicle body-based transmitting means, wherein (2m?1)×(2n?1)?t is satisfied with t, m and n representing the number of the tire-based transmitting and receiving devices, the number of vehicle body-based transmitting groups and the number of vehicle body-based receiving groups respectively, each tire-based transmitting and receiving device receives the transmission request from any one of the vehicle body-based transmitting groups, the information transmitted from the tire-based transmitting and receiving device is received by any one of the vehicle body-based receiving groups, and each tire-based transmitting and receiving device has a different combination of the groups of the vehicle body-based transmitting means and the vehicle body-based receiving means.

Abstract: A tire module for sensing deflection of a tire and a method of sensing deflection of the tire. The tire module includes a piezoelectric converter that is configured for installation on an inside surface of the tire. The piezoelectric converter includes at least one elastically deformable region that is formed from piezoelectric material. A deflection limiting means is configured to delimit deflection of the elastically deformable region.

Abstract: Method of processing data in a vehicle tire monitoring system. For a first given period of time, referred to as the reference period, a device calculates, for each class of temperature supplied, the corresponding mean pressure in a given tire. Then, for at least a second given period of time, the device calculates, for each class of temperature supplied, the corresponding mean pressure and the difference between this mean pressure and the reference mean pressure, and the device calculates the mean value of these differences.

Abstract: The invention provides a monitoring device and tire combination wherein an antenna is mounted to the tire in a location spaced from the monitoring device. In one embodiment, the antenna may be mounted to the tire sidewall outside the body cords of the tire. The antenna may be mounted on the outer surface of the sidewall or embedded within the body of the sidewall. The antenna is connected to the monitoring device with a connector. The connector may be electrically coupled to the monitoring device or may be connected to the monitoring device with a plug and socket connection. When the antenna is outside the body cord, the connector may extend from the antenna through the bead filler, over the top of the turn up, or under the bead ring.

Abstract: The invention relates to axle end equipment for a vehicle, in particular an aircraft, the equipment comprising a stationary portion for securing to the axle and a rotary portion for securing to the wheel carried by the axle. According to the invention, the rotary portion comprises first remote connection means in communication with a sensor mounted on the wheel so as to put the sensor and the rotary portion of the equipment into contactless electromagnetic relationship.

Abstract: A tire sensor that communicates to a remote interrogator in one of two modes depending on the nature of the interrogation. The interrogator may be distributed throughout a vehicle if needed for design options. Further, the interrogator only interrogates the transponder when the interrogator has reason to believe that the transponder is in range of the interrogator. The interrogator and transponder may be configured to operate in different modes for communication during operation of the tire on a vehicle and during non-operation. The transponder may communicate tire condition information to the interrogator concerning environmental or other information sensed about the tire.

Abstract: Subject matter disclosed herein may relate to energy harvesting piezoelectric modules as may be used, for example, in power supplies for tire pressure monitoring systems.

Abstract: In an identification information examination mode, reception sensitivity of a reception device in an information obtaining mode is reduced. In the reception device, information transmitted from a transmission device mounted in a vehicle adjacent to the host vehicle is not received, and identification information transmitted from a transmission device mounted in the host vehicle is received. Then, an examination is performed by comparing the received identification information with the identification information stored in memory in advance.

Abstract: A system and method are provided for monitoring the physical integrity of a tire. The system and method include measuring a signal proportional to the speed of rotation of the wheel and calculating a harmonic signal of the round of wheel (e.g., equal to the energies of the harmonics of this signal), then comparing the result with a threshold and activating an alarm when over-passing this threshold.

Abstract: A tyre having an internal surface of substantially toroidal conformation, includes an electronic device including an electronic unit and an antenna, the latter being connected with the electronic unit and having an inner perimetral edge, and an anchoring body mounted on the internal surface for engagement between the electronic device and the tyre, the anchoring body including at least two portions, said electronic unit being arranged between the portions. Each of the portions has a fastening surface secured to the internal surface of the tyre and a groove in which the inner perimetral edge of the antenna is fitted to maintain a constraint between the electronic unit and the anchoring body. Also disclosed is a method of installing an electronic unit into a tyre.

Abstract: A tire parameter sensor unit for monitoring one or more vehicle tire parameters such as internal tire pressure and temperature and developing a permanent log of the operational history of the tire. The sensor unit has a power system, a processor/transmitter, a radio time clock, one or more sensors, and a memory mounted on a substrate. This assembly is permanently attached to the tire in the side wall or tread wall. Initial tire identification information is stored in the memory upon tire fabrication. During the lifetime of the tire, operational information specifying the tire operating conditions (pressure, temperature, etc.) is permanently stored in the memory along with real time data. The operational information and real time data can be read out from memory to provide the history log.

Abstract: A ground-contacting component of a vehicle, comprising at least two physical parameter measurement systems, each measurement system having a linearly polarized antenna. The polarization directions of the antennas make an angle of between 30 and 90° between them. Also disclosed are a tire and a vehicle ground contact.

Abstract: The device comprises means for measuring the pressure of the gas contained in a tire of a vehicle, means for collecting pressure measurement data and means for calculating the change in pressure between two instants of measurement data collection. The device further includes clocking means for clocking the time of the measurement data collection and for calculating the change in pressure between clocked instants of collection. The device also makes it possible for the pressure measurement to be temperature-compensated.

Abstract: A wireless and batteryless pressure sensor apparatus comprises of a SAW sensor and an antenna mounted on a printed circuit board. Optionally, and RFID tag in used in combination with the SAW sensor. A sensor antenna and a RFID antenna can be located on the printed circuit board such that the antennas communicate electrically with the sensor and the RFID device. The sensor can be interrogated utilizing a radio frequency, which is used to excite a SAW crystal inside the sensor. The interrogation signal causes the SAW to resonate wherein a resonant frequency changes with the pressure and temperature that is applied to the sensor. An interrogator can receive a return (echo) signal representing a change in SAW sensor properties (e.g., diaphragm change). A printed circuit board can be mounted on a stainless steel port and overpackaged with standard processes for hermetically sealing the sensor, or sensor and RFID device with at least one antenna.

Abstract: A vehicle tyre data monitoring system has a wheel mounted sensor means that is adapted to transmit one or more of pressure, temperature, angular velocity, and force vector data for a tyre as a digital serial datagram through a two-wire communication channel to a chassis mounted reader means. The communication channel is adapted to simultaneously supply power to the sensor means and receive the data for processing and subsequent display to a user of the system.

Abstract: Tire monitoring arrangement including at least one tire condition sensor arranged on the tire to measure a condition of the tire and an energy generating mechanism or device arranged on the tread of the tire for generating electricity upon rotation of the tire. The energy generating mechanism is connected in a circuit with each tire condition sensor and powers the circuit and thus provides energy for the tire condition sensor(s). The tire condition sensor(s) and energy generating mechanism may be part of a tire monitor assembly which is affixed to an interior surface of the tire opposite the tread or inserted into the tire opposite the tread. Various tire condition sensors may be used including accelerometers, tire pressure sensors and tire temperature sensors. Various energy generating mechanisms may be used including a piezoelectric device, a polyvinylidene fluoride (PVDF) piezoelectric polymer, and a flexible material whose flexure causes energy generation.

Abstract: A tire pressure detecting valve stem has a case, a body and a tire pressure detector. The case is rectangular and has an inner surface. The body is a valve stem and is integrally and transversely mounted on the case and has an inner section and a center pin. The inner section is integrally mounted in the case. The center pin is conductive, is coaxially mounted in the inner section and protrudes from the inner surface of the case. The tire pressure detector corresponds to and is mounted on the inner surface and is electronically connected to the center pin. Because the case is integrally and compactly mounted on the inner section of the body, the case will be mounted on and stay close to a rim when the body is mounted through the rim.

Abstract: A tire pressure monitoring system sensor includes a body provided with an air inlet that provides fluid communication between the interior of the body and the interior of a tire. A pressure plate slides within the interior of the body by pressure in the tire, in a direction away from the air inlet. A spring biases the pressure plate toward the air inlet. Several sensors are attached to the body, each configured to generate a signal indicative of proximity of the pressure plate. The sensor may further include an air supply valve to supply air to the tire, connected to the body. The body may define an air supply passage through which the air supplied from the air supply valve is supplied to the tire through the air inlet. Three sensors may be provided: one indicative of excessive pressure, one indicative of appropriate pressure, and one indicative of insufficient pressure.

Abstract: A tire parameter sensor unit for monitoring one or more vehicle tire parameters such as internal tire pressure and temperature and developing a permanent log of the operational history of the tire. The sensor unit has a power system, a processor/transmitter, a radio time clock, one or more sensors, and a memory mounted on a substrate. This assembly is permanently attached to the tire in the side wall or tread wall. Initial tire identification information is stored in the memory upon tire fabrication. During the lifetime of the tire, operational information specifying the tire operating conditions (pressure, temperature, etc.) is permanently stored in the memory along with real time data. The operational information and real time data can be read out from memory to provide the history log.

Abstract: The invention relates to systems and methods for detecting and monitoring tire deformation. In one embodiment, a tire deformation detection system comprises a first electrode, a second electrode, circuitry, and a central control unit. The first electrode is coupled to an interior surface of a tire. The second electrode is coupled to an interior surface of the tire and configured with the first electrode to form a first capacitor. The circuitry is configured to measure a first capacitance of the first capacitor. The central control unit is configured to detect a deformation of the tire based at least in part on the first capacitance.

Abstract: A sensor transponder (1) with at least one acceleration sensor is arranged on the inner side of a running surface (2) of a tire (9). The signals from the acceleration sensor are compared with prespecified threshold values and then integrated, whereby following the formation of a quotient, the tire contact length (6) is calculated independently of the velocity.

Abstract: A tire system includes a plurality of piezoelectric devices mounted to the tire. The piezoelectric devices provide output signals in response to deformation of the tire. A processor has input terminals for receiving the signals from the piezoelectric devices, and the processor is programmed to determine tire parameters in response to the output signals from the piezoelectric devices. A power converter has input terminals for receiving the signals from the piezoelectric devices, and the power converter is connected to the processor to power the processor.

Abstract: A head-up display system embedded in a vehicle having at least one tire is provided. The head-up display system includes a tire sensor, a speed detecting module, a host apparatus and a head-up display apparatus. The tire sensor is disposed within the tire for detecting a temperature and a pressure of the tire, and the speed detecting module detects a speed of the vehicle. The host apparatus drives the tire sensor with a wireless low-frequency signal and receives a high-frequency temperature signal and a high-frequency pressure signal transmitted from the tire sensor. Afterwards, according to the received signals, a processing unit of the host apparatus drives the head-up display apparatus to produce a temperature image, a pressure image and a speed image on a windshield by projecting.

Abstract: A tire system includes a plurality of piezoelectric devices mounted to the tire. The piezoelectric devices provide output signals in response to deformation of the tire. A processor has input terminals for receiving the signals from the piezoelectric devices, and the processor is programmed to determine tire parameters in response to the output signals from the piezoelectric devices. A power converter has input terminals for receiving the signals from the piezoelectric devices, and the power converter is connected to the processor to power the processor.

Abstract: In order to determine the tire positions or wheel positions automatically while the vehicle is in operation, the attenuation along a transmission path from the tire to a fixed position on the vehicle is measured and compared with stored values. Systems of this kind are error prone when other vehicles using similar systems are located in the receiving range. In order to increase the reliability of such a system it is useful to determine the attenuation along the transmission paths between the wheel units and compare it with known values. Toward that end, the novel wheel unit enables data to be provided by way of which the attenuation of the transmission path from one wheel unit to another wheel unit can be determined.

Abstract: A tire sensor that communicates to a remote interrogator in one of two modes depending on the nature of the interrogation. The interrogator may be distributed throughout a vehicle if needed for design options. Further, the interrogator only interrogates the transponder when the interrogator has reason to believe that the transponder is in range of the interrogator. The interrogator and transponder may be configured to operate in different modes for communication during operation of the tire on a vehicle and during non-operation. The transponder may communicate tire condition information to the interrogator concerning environmental or other information sensed about the tire.

Abstract: The present invention provides a tire pressure sensor system that has multiple functions and is integrated into a small package. The system includes one or more Micro Electro Mechanical System (MEMS)-based sensors, including a MEMS-based pressure sensor; a MEMS-oscillator-based wireless signal transmitter; and a microcontroller, where the microcontroller processes the data generated by at least one of the MEMS-based sensors, controls at least one of the MEMS-based sensors, and controls the encoding and timing of transmission of data from the wireless signal transmitter. Preferably, the MEMS-based sensors, MEMS-oscillator-based wireless signal transmitter, and microcontroller are integrated onto one or more chips in one or more packages. The system also preferably includes a MEMS-based motion sensor, a low frequency (LF) receiver, an IC-based voltage sensor, a voltage regulator, a temperature sensor and a polarization voltage generator.

Abstract: A wheel identifying apparatus according to the present invention includes a plurality of transceivers, a triggering device, a receiver, and a wheel identifier. Each of the transceivers is located on one of a plurality of wheels of a vehicle and works to receive a trigger signal and transmit a response signal in response to receipt of the trigger signal. The triggering device is located on a body of the vehicle at different distances from the transceivers and works to transmit the trigger signal. The receiver works to receive the response signals transmitted by the transceivers. The wheel identifier is operatively connected to the receiver and works to identify, for each of the response signals received by the receiver, the wheel on which the transceiver having transmitted the response signal is located using the fact that strengths of the trigger signal at the transceivers are different from each other.

Abstract: A method for monitoring pressure is described herein. The method includes the steps of performing an accurate measurement of pressure and performing an approximate measurement of pressure. Then, providing a notification signal if a difference between the approximate measurement and the accurate measurement is greater than a predetermined value. An apparatus for performing the method is also disclosed.

Abstract: A method for assigning a position of a tire, having a tire sensor, on a vehicle, includes transmitting, with the sensor, a signal including at least an identification number of the sensor following activation by a signal from an LF antenna connected to an evaluation unit. At a system start time, the evaluation unit first initiates an initialization including determination of the position of each tire having a sensor. The evaluation unit stores the identification number of each sensor together with the determined position of the tire having the sensor, before switching into a normal operating mode in which tire data, for example air pressure, is monitored by the sensors, with the position and preferably assignment of the sensor to a specific LF antenna, being stored in the sensor and kept available for retrieval. A device and a system for measuring air pressure in a vehicle tire are also provided.

Abstract: A tire pressure gauge is provided mountable to a valve stem of a tire/wheel combination or to a rim of a wheel. The tire pressure gauge includes both a proximal display viewable by an individual adjacent the tire/wheel combination and a remote indicator of tire pressure status. This remote indicator can be in the form of a warning light or in the form of a remote display with a receiver/antenna communicating with a transmitter coupled to a pressure transducer which monitors tire pressure. Most preferably, both the warning light and remote display are provided together. A valve core is associated with the tire pressure sensor for ease in adding air to the tire when needed. The pressure transducer and warning light and/or transmitter are contained together within a transmission module preferably removably coupleable to a gauge including the tire pressure sensor and the proximal display.

Abstract: A portable remote controller for a tire status detector, includes a portable casing, a transmission circuit disposed in the casing, a low-pass filter disposed at an output side of the transmission circuit for permitting a signal with a frequency of not more than the first frequency to pass through the low-pass filter, a receiving circuit disposed in the casing, a high-pass filter disposed at an input side of the receiving circuit for permitting a signal with a frequency of not less than the second frequency to pass through the high-pass filter, a ferrite bar antenna housed in the casing and having a ferrite bar wound with an antenna coil, the antenna coil having two terminals, one of which being connected to the ground and the other being connected in common to the low-pass and high-pass filers and a duplexer composed of the low-pass and high-pass filters. The ferrite bar antenna is used both for transmission of the long wave signals and for receipt of the ultra high frequency signals.

Abstract: A tire pressure monitoring system (TPMS) for a vehicle, and related operating methods are provided. The TPMS includes a plurality of tire pressure sensors, each being configured to wirelessly transmit respective sensor signals, and a wireless receiver configured to wirelessly receive and process sensor signals transmitted by the tire pressure sensors. The location of the wireless receiver is biased toward the fore or aft of the vehicle. The wireless receiver has an adjustable sensitivity setting that accommodates wireless signal reception in a key fob mode and a TPMS mode. One operating method for the TPMS involves wirelessly receiving sensor signals transmitted by the tire pressure sensors, determining respective received signal strength (RSS) values for the received sensor signals, and processing the RSS values to resolve whether the received sensor signals were transmitted by a fore tire pressure sensor or an aft tire pressure sensor.

Abstract: A wireless time stamp system and associated method is disclosed and includes a plurality of slave wireless sensor components each configured to transmit a sensed system condition at unique predetermined time intervals. The system further includes a master wireless control component configured to receive the transmitted sensed system conditions from each of the slave wireless sensor components. The master wireless control component is further configured to assign the unique predetermined time intervals to each of the slave wireless sensor components, thereby eliminating data collisions at the master wireless control component.

Abstract: A tire monitoring system for a vehicle having tires determines if two tires share a same side of the vehicle based on a state of each of the two tires. In at least one embodiment, a first output signal indicative of a state of a first tire and a second output signal indicative of a state of a second tire are transmitted and received. A determination as to whether the first tire and the second tire are on a same side of the vehicle based on the state of the first tire and the state of the second tire is made.

Abstract: A tire and wheel rim assembly includes a tire supporting rim having an outward facing mounting surface; a tire mounted to the rim positioning an internal tire cavity over the rim mounting surface; a passageway extending through the rim for communicating air pressure between the tire cavity and a side of the rim opposite the tire cavity; and means for controllably regulating the flow of air through the passageway. A connecting member such as a bolt may extend through the rim outside mounting surface to affix a tire pressure monitoring housing to the rim and the axial passageway through the rim may be an axial bore through the bolt. Regulation of air flow through the passageway may be effected by setting the diameter of the passageway sufficiently small; or incorporating a needle orifice in the passageway; or incorporating a porous insert body into the passageway. The insert body may be composed of sintered metal and may be fused to the internal sidewalls of the bolt.

Abstract: An allocation method combines two tire pressure monitoring systems in motor vehicles being equipped with pressure measuring modules. Each pressure measuring module records a value responsive to the tire inflation pressure and sends the latter to a receiving unit connected to an evaluating device together with an individual identification code (IDx) allocated to the respective pressure measuring module. Signals about the rotational speed of each one wheel being sensed by wheel rotational speed sensors are transmitted to the evaluating device, and since the installation positions y of the wheels at the vehicle are known to the evaluating device, the wheels at the vehicle are known, and the allocation method is performed by taking into consideration established probability values W_IDx_y, with the probability values W_IDx_y describing a frequency distribution which indicates how often pressure measuring modules with the identification codes IDx are detected as pertaining to the installation positions y.

Abstract: A tire pressure monitoring system may adjust the power it consumes. In at least one embodiment, the system includes a receiver that receives a first signal having a signal strength, determines the signal strength, and causes a second signal to be sent if the signal strength is more than a desired signal strength.

Abstract: A method for estimating accurately and stably the change of forces exerted on the tire or change of contact condition with the ground of the tire and an apparatus for putting it in operation.

Abstract: The invention concerns a tire provided with a capacitative sensor including two substantially parallel electrodes, the sensor being carried by a sidewall of the tire. The electrodes of the sensor lie substantially in a plane perpendicular to the rotation axis of the tire and are substantially orientated in an ortho-radial direction. The invention also concerns a tire provided with a deformation sensor, a method for evaluating the deflection of a tire, and a deformation sensor.

Abstract: A tire parameter monitoring system has a plurality of sensor units each mounted with a different vehicle tire. Each sensor unit has a magnetic sensing element for converting magnetic field signals generated by a proximate set of magnets mounted to the vehicle at the tire locations. Each magnet set generates a unique magnetic field which identifies the magnet set location. Each sensor unit has a microcontroller for combining the converted magnetic field signals with fire parameter signals, and a transmitter for transmitting the combined signals to a receiving location. Received tire parameter signals are correlated with the tire location using the location signals, and driver advisory signals are presented to the driver.

Abstract: This invention provides a tire monitoring system, comprising a remote tire monitoring unit installed in the tire, a central controller, a speech indicating unit and a brake deceleration mechanism; wherein the remote tire monitoring unit is used to monitor and sample the pressure and temperature within the tire, and generate the sampling data signals of tire conditions which are subsequently wirelessly transmitted to the central controller; the central controller wirelessly receives sampling data signals of tire conditions, and calculates received data signals so as to generate speech indicating order and/or brake deceleration order, and afterward conveys the speech indicating order to the speech indicating unit, while the brake deceleration order to the brake deceleration mechanism; a speech indication unit, provided to receive said speech indication order and output the speech indication information; and a brake deceleration mechanism, provided to receive said brake deceleration order and performs action of

Abstract: In order to develop an electronic communication system (100; 100?), designed for a progressive movement means, having at least one base station (10) and having at least one carrier station (60) such that the possible uses of this communication system (100; 100?) can also be extended to other important areas of use of a progressive movement means, it is proposed that the carrier station (60) be designed as in each case at least one sensor unit, which is assigned to at least one wheel or tire (90) of the progressive movement means and—which is designed to detect and/or determine at least one characteristic parameter of the wheel or tire (90), such as for example the air pressure and/or the temperature and/or the wear of the wheel or tire (90).

Abstract: A holder for a component on a vehicle has two holding elements fastened independently and at a distance from each other to the vehicle. A first holding element has a first latching element which interacts perpendicular to the plane of the holding region with a first mating latching element which is complementary thereto and is formed on a first end side of the component. A second holding element has a second latching element which interacts parallel to the holding region plane with a second mating latching element which is complementary thereto and is formed on a second end side of the component. The second holding element has a receiving opening which is passed through by a protruding region, which is formed on the second end side, wherein an opening edge of the receiving opening engages around the protruding component region at least on a side remote from the holding region.

Abstract: A tire parameter monitoring system has a plurality of sensor units each mounted with a different vehicle tire. Each sensor unit has a magnetic sensing element for converting magnetic field signals generated by a proximate set of magnets mounted to the vehicle at the tire locations. Each magnet set generates a unique magnetic field which identifies the magnet set location. Each sensor unit has a microcontroller for combining the converted magnetic field signals with fire parameter signals, and a transmitter for transmitting the combined signals to a receiving location. Received tire parameter signals are correlated with the tire location using the location signals, and driver advisory signals are presented to the driver.

Abstract: A method determines a direction of rotation of a rotating body about its axis of rotation by measuring two acceleration signals x and y with an acceleration sensor. The two acceleration signals x and y are at a 90° angle to each other, are oriented not parallel to the axis of rotation, and both a centrifugal acceleration generated by a circular movement and a gravitational acceleration are taken into account. The measured acceleration signals x and y are differentiated mathematically. The differentiated x acceleration signal is differentiated a further time and correlated with a y signal that has been differentiated once for obtaining a correlation function. The differentiated y acceleration signal can be differentiated a further time and correlated with the x signal that has been differentiated once for obtaining a second correlation function. The method determines the direction of rotation of rotating tires of a motor vehicle.

Abstract: The position of the rotation of a tire complicates the establishing of a wireless connection between a sensor unit attached to the tire and a sensor control unit attached to a vehicle body. A reflection plate (20) is attached to an inner surface of a wheel housing (16) at a position different from that of a sensor control unit (10). A transmission electromagnetic field from the sensor control unit (10) is reflected by the metal reflection plate (20) and transmitted to a sensor unit (6) rotated to a position to which the field does not readily reach directly from the sensor control unit (10). The sensor unit (6) varies an impedance of a coil antenna in accordance with transmission data, and generates a variation in the transmission electromagnetic field. The variation is detected via the reflection plate (20) as a variation in a transmission load of the sensor control unit (10), and the transmission data from the sensor unit (6) is detected in the sensor control unit (10).

Abstract: Identification information for identifying a tire, a tire inner pressure and a tire inner temperature are sent to a tire checking device from a first electronic device provided within a tire and measured results are shown on a display. Groove depth data from a depth meter are also received by the tire checking device and shown on the display. The tire checking device stores received management information such as a tire inner pressure, a tire inner temperature, a groove depth and so on in a memory with associating them with each tire. The stored management information is extracted by a control unit if required and shown on the display. Therefore, a tire inner pressure and a tire inner temperature are detected automatically and groove depth data are stored with being associated with each tire, and thereby the tire inner pressure, the tire inner temperature and the groove depth data can be displayed.