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 method of determining the position of a tire on a vehicle using signal pulses is described. The method includes receiving a plurality of signal pulses from a transmitter associated with the tire in the time the tire completes approximately one rotation, providing at least one predetermined signal pattern associated with a unique tire position on the vehicle, and comparing the plurality of signal pulses to the predetermined signal pattern to determine the position of the tire on the vehicle.

Abstract: A tire pressure monitoring system (12) for a vehicle (10) has a pressure sensor circuit (16A) that includes an ECU (95), a transmitter/receiver (90), and pressure sensor (94). A method of operating a tire pressure monitoring system includes calibrating a tire pressure sensor circuit in a first range and a second range and generating a first calibration data for the first range and second calibration data for the second range. The first calibration data and the second calibration data are stored in a memory of the tire pressure sensing circuit (16A). A data signal corresponding to the pressure is generated. The first or second calibration data is generated in response to the range of the data signal to form a selected calibration. The data signal is calibrated with the selected calibration to form a pressure indicative signal. The pressure indicative signal is transmitted to a receiver (28) within the vehicle (10) with a range status corresponding to the selected calibration.

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 wheel information processing device comprises a plurality of wheel-side communication units provided in a wheel of an automotive vehicle, and a body-side communication unit provided in a body of the vehicle to communicate with the plurality of wheel-side communication units. A pattern of transmission of signals transmitted by the plurality of wheel-side communication units respectively is determined based on a characteristic of the wheel-side communication unit concerned.

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: A power supply using a static magnetic field of a tire pressure monitoring system is provided. The power supply includes: a static magnetic field generator installed at a car position adjacent to a tire, and generating the static magnetic field; and an EMF (ElectroMotive Force) coil installed at the tire, and generating an induced electromotive force by the generated static magnetic field and a relative motion resulting from rotation of the tire, and providing the generated electromotive force to the transmitter and the sensor.

Abstract: The present invention provides a wireless tire pressure and tire temperature detecting system, using a wireless monitoring and transmission device with a centrifugal switch. When the tire rotational speed of the car reaches a certain speed, it turns on the centrifugal switch. The centrifugal switch is used to turn on the entire wireless monitoring and transmission device to detect, process signal, and transmit. The wireless monitoring and transmission device is not working, until the tire rotational speed of the car reaches a certain speed before it is initiated and causes power consumption. The present invention saves more power consumption than the conventional structure, which extends the shelf life of the wireless tire pressure and temperature detecting system as well as time involved to change the battery, which is practical and convenient.

Abstract: A circuit arrangement is provided for a power supply to a transponder including an antenna resonant circuit and a downstream rectifier circuit for receiving and for rectifying an electromagnetic signal, a charging capacitor connected downstream on the output side of the rectifier circuit to provide a first supply voltage, with a tuning circuit for tuning the antenna resonant circuit to its resonance frequency, and with an auxiliary voltage source, which is designed to provide a second supply voltage, lower than the first supply voltage, for supplying the tuning circuit. A method is also provided for supplying power to a transponder with a first supply voltage, as well as a transponder having a circuit arrangement for a power supply.

Abstract: A tire pressure monitoring system includes sensors respectively associated with tires normally installed on a vehicle. Each sensor transmits a sensor signal indicative of a parameter of the associated tire to a controller. The signal strength of each sensor signal as received by the controller varies over time when the tire is rolling and remains constant over time when the tire is stationary. The controller generates a received signal strength indicator (RSSI) signal indicative of the signal strength of each sensor signal as received by the controller. The controller processes the RSSI signals along with a speed signal indicative of whether the vehicle is moving or is stationary to determine if any tire is stationary while the vehicle is moving, and generates a warning indicative of an unmonitored tire installed on the vehicle in place of a tire upon determining that the tire is stationary while the vehicle is moving.

Abstract: A navigation apparatus including a central processing unit, an imaging module, a GPS module, a tire pressure monitoring module, and a storage module is provided. The imaging module captures an image signal. The central processing unit controls the imaging module to capture the image signal for generating image data, and further stores the image data in the storage module. The central processing unit executes the electronic map software stored in the storage module and receives the positional data generated by the GPS module for generating route guidance. The central unit receives the digital tire pressure signal received by the tire pressure monitoring module to generate tire pressure data and further identifies whether or not the tire pressure data is in compliance with a safety value.

Abstract: A combined tire pressure gauge and remote tire pressure display includes a port adapted to couple to a vehicle tire valve stem and to open a valve in the valve stem; a chamber in physical communication with the port; a local pressure transducer in the chamber for detecting a pressure of a fluid within the vehicle tire and providing an output signal representative of the detected pressure; a wireless receiver for receiving a signal identifying a tire pressure sensor and having a detected tire pressure and for providing an output signal; a processor for receiving the output signal from the pressure transducer and the output signal from the wireless receiver, and for providing a processor output signal indicative of an identified tire and a value of the detected pressure, in a remote tire display mode, and for providing a processor output signal indicative of a detected tire pressure, in a tire pressure gauge mode; and a display coupled to the processor for providing a visible indication of detected pressure val

Abstract: A tyre having a radially internal surface of substantially toroidal conformation, includes: a housing mounted on the internal surface of the tyre and an electronic unit at least partially housed in the housing, the housing including at least two portions, each having a cavity in contact with a respective portion of the electronic unit and housing the same, each portion of the housing being mounted on the internal surface of the tyre, and a fastening element applied to the portions of the housing to maintain a constraint between such portions and the electronic unit. A method of installing the electronic unit into a tyre.

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 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: A universal monitor to be mounted in a tire of a vehicle, the monitor for use in a remote tire pressure monitoring system for the vehicle. The monitor includes a sensor for sensing tire pressure, and a storage device for storing a plurality of codes, each code comprising at least a data format. The monitor also includes a transmitter in communication with the sensor and the storage device, the transmitter for transmitting a wireless signal including data representing the sensed tire pressure. The wireless signal is transmitted by the transmitter according to at least one of the stored plurality of codes.

Abstract: A transmitter unit of an apparatus for monitoring the condition of a tire includes a casing having an opening defined in an end of the casing. A transmitter is received in the casing through the opening. The transmitter gathers and wirelessly transmits information regarding the condition of the tire. The casing is secured to the outer circumferential surface of a rim wheel of the tire by an adhesive tape or an adhesive agent. Accordingly, the transmitter unit is capable of being attached to the rim wheel in a suitable manner.

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 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: In the system for monitoring tire pressure in a tire of a vehicle, temporally successive tire pressure measured values are sensed by a transmitting unit, and at least part of the tire pressure measured values is transmitted to a receiving unit with a variable frequency of occurrence, wherein the frequency of occurrence is derived from the sensed tire pressure measured values by means of a control unit.

Abstract: A tire pressure monitoring system receiver includes a storage unit to store transmitter IDs associated with a plurality tire pressure monitoring system transmitters, a receiving unit to receive a transmitted tire pressure monitoring system telegram and a transmitted checksum, a calculating unit to calculate a test checksum from the received telegram and one of the stored IDs, a comparing unit to compare the test checksum with the transmitted checksum, and an identification unit to identify a source transmitter from the test checksum in response to finding a match between the test checksum and the transmitted checksum.

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: The invention provides a tire condition information collection apparatus and a relay apparatus thereof, which corrects a predetermined physical quantity within tire by use of a predetermined physical quantity outside tire in a vicinity of tire to inform of the corrected physical quantity. An air pressure and temperature of tire are detected by a detection apparatus 10 provided in each wheel 2. The detection data is transmitted from the detection apparatus 10 to a relay apparatus 20 disposed in the vicinity of each wheel by electromagnetic wave of a first frequency. When receiving the transmitted data, the relay apparatus 20 detects an atmospheric pressure and temperature in the vicinity of the wheel 2, and transmits the data to a main apparatus 30 along with the detection data received from the detection apparatus 10.

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: 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 method and a device for a vehicle-related telematics service are provided in which the telematics service is divided into partial functionalities and these partial functionalities are subdivided between server and data terminal.

Abstract: A vehicle information processing apparatus provided in a vehicle is provided with a TPMS valve that includes an air pressure sensor which obtains a tire air pressure as wheel information and a wheel-side communication device that transmits the wheel information and an ID unique to that wheel-side communication device at regular intervals; an ECU which receives the wheel information from the wheel-side communication device in each TPMS valve via a vehicle body-side communication device and processes that wheel information; and an onboard battery which supplies power to the ECU. Upon receiving a command to shift into a verification mode while power is being supplied from the onboard battery, the ECU performs a predetermined verification based on a signal transmitted at regular intervals from each wheel-side communication device. After receiving the command to shift into the verification mode, the ECU remains in the verification mode until a preset condition is satisfied.

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: An apparatus for detecting positions of wheels of a vehicle is provided. In the apparatus, a triggering signal is transmitted from the body side to each transceiver mounted at each wheel. In each transceiver, the strength of the received triggering signal is measured and formatted into a frame of data to be transmitted to a receiver mounted to the vehicle body. The strength of the triggering signal is used to detect wheel positions by determining that each transducer is disposed at which wheel. The receiver determines if there is a reply of the flame of data containing the strength when the triggering device transmits the triggering signal. When no replay comes from the transceiver, the strength of noise is measured in the transceiver in response to a command from the receiver. When the noise strength is less than a threshold, the receiver commands an alarm member to issue alarm.

Abstract: A pneumatically actuated switching device has an elliptical dome with spaced apart support columns protruding from a concave inner face surface for anchoring to a floor of a wedge shaped base. The base is elliptical and bounded by an endless upstanding sidewall having a projected edge that varies continuously in height about one of the major axis and the minor axis, the projected edge having one of a channel and a locking lip and the other of the channel and the locking lip being formed on the elliptical edge for interlocking engagement in an air tight fashion. An electrically conductive switch is coupled by a duct for responding to a volume of pressurized air within the dome and the base by deflection of the convex actuating wall.

Abstract: A magnetic pressure sensing device for rotatably moving parts, of the type including at least one magnetic field source element associated to said rotatably moving part and a magnetic field sensing element associated to a fixed part to measure parameters of a magnetic field determined by said magnetic field source element, said parameters of the magnetic field being a function of the pressure applied to said rotatably moving part. The magnetic field source element includes means for rotating around at least one axis the direction of said magnetic field as a function of the pressure applied to said rotatably moving part.

Abstract: A tire condition monitoring system monitoring a condition of a tire attached to a tire wheel, includes a tire side communication device mounted on the tire wheel for detecting an inner pressure of the tire and transmitting a result of detection by electromagnetic waves, a vehicle-body side communication device provided on a vehicle body including a plurality of components for receiving by electromagnetic waves information transmitted by the tire side communication device, a tire side modulator provided in the tire side communication device for superimposing information including the result of detection on electromagnetic waves, thereby outputting the electromagnetic waves as surface waves of the tire wheel, and a vehicle body side demodulator provided in the vehicle-body side communication device for receiving the electromagnetic waves propagated from the tire wheel to surfaces of the components of the vehicle body.

Abstract: An air pressure sensor (2) for a vehicle tire warning system includes a tubular housing (21) defining a chamber (218), an air pressure actuating device seated in the chamber and being moveable back and forth in the chamber in response to air pressure change in the vehicle tire, and a switch device to electrically connect a high air pressure warning circuit or a low air pressure warning circuit under the drive of the air pressure actuating device. The chamber of the tubular housing is communicated to the atmosphere via a connecting pipe (29).

Abstract: A method of detecting a rapid leak of gas contained in an automobile tire based on periodic measurements of a pressure Pa and a temperature Ta of the gas. The method includes determining a reference pressure Pcref, calculating an alarm threshold pressure Sref from the reference pressure Pcref, calculating a temperature-compensated pressure Pc at each measurement acquisition period, and comparing the compensated pressure Pc with the alarm threshold pressure Sref, wherein the leak is detected if the compensated pressure Pc is less than the alarm threshold pressure Sref.

Abstract: A tire inflation pressure sensing apparatus according to the invention includes a plurality of transmitters, each of which is provided on one of a plurality of wheels of a vehicle, and a receiver provided on a body of the vehicle. Each transmitter includes a pressure sensor working to generate a pressure signal representative of an inflation pressure of a tire on a corresponding one of the wheels and a noise receiver working to receive a noise generated by a noise source in the vehicle. Each transmitter is configured to transmit the pressure signal and the received noise to the receiver. The receiver is configured to determine the inflation pressures of tires based on the pressure signals and make a determination for each of the transmitters as to whether the transmitter is provided on a front-wheel or a rear-wheel of the vehicle based on a level of the corresponding received noise.

Abstract: A tire pressure control system for a tire mounted to a wheel of a vehicle is disclosed. The tire pressure control system comprises a servo system mounted to the wheel that includes a servo mechanically connected to a vent valve that is in fluid communication with a gas inside the tire. The vent valve is adapted for bleeding the gas out of the tire and into the ambient atmosphere. A pressure sensor is in fluid communication with the gas inside the tire, and a control circuit is electrically connected to the servo and the pressure sensor. The control circuit further includes a signal receiving means and a memory for storing a commanded pressure signal. The control circuit actuates the servo to open the vent valve when the pressure sensor indicates a tire pressure of greater than the commanded pressure. A master control unit is adapted to transfer the commanded pressure signal to the control circuit through a transmission means.

Abstract: A tire has a piezoelectric flexing element associated with an energy storage device (e.g., a capacitor). The piezoelectric flexure element is mounted in cantilever fashion in a housing so as to be positioned substantially along a plane orthogonal to a radial direction of the tire and, so that a first end of the piezoelement is restrained by the housing. A loading mass is coupled to the second end of the piezoelectric flexure element. A small gap is formed between the inner walls of the housing and the outer surface of the loading mass in order to allow limited flexure of the piezo-electric element. The housing including the piezoelectric is mounted in a tire portion in correspondence of a tread area of the tire, preferably on the inner surface of the tire. The piezoelectric element flexes under the action of the radial acceleration when the tire rotates.

Abstract: A method for monitoring deformations in a tire of a vehicle wheel, the wheel including the tire and a rim, the method including: providing the wheel with at least two magnetic-field emitters mutually disposed so as to yield a composite magnetic field having one or more space portions where at least one component of the composite magnetic field is substantially null; disposing at least one main magnetic-field sensor substantially in one of the one or more space portions; monitoring variation of the at least one component of the composite magnetic field; and correlating the variation with tire deformations. At least one of the magnetic-field emitters is disposed in contact with the tire. A system for monitoring deformations in a tire of a vehicle wheel includes the wheel, the at least two magnetic-field emitters, and the at least one main magnetic-field sensor.

Abstract: In the automotive industry that there is an increasing need for automatic tire pressure checking systems. One challenge here is to identify the positions of the tires on the vehicle. This is normally programmed-in it at the factory at the end of the production line. The tires however mostly do not remain in the same position during their lifetime. The invention allows a wheel unit to be automatically assigned to its wheel position on the motor vehicle. To this end the attenuation along a transmit path from a wheel unit to a transmission unit or receiving unit on the motor vehicle is determined. The attenuation determined is a characteristic value which allows conclusions to be drawn about the position of a wheel unit. An assignment by way of the attenuation has the advantage that the wheel unit is independent of variations in the transmit power of the transmission unit.

Abstract: A tire location detecting apparatus for a vehicle with four wheels includes four rotation direction detecting devices, four transmitters, a triggering device, a receiver, and a controller. Each of the rotation direction detecting devices outputs a rotation direction signal which is then transmitted by an associated one of the transmitters. The triggering device triggers the transmitter on a first one of the four wheels to transmit an identification signal specific thereto. The receiver receives all of the signals transmitted from transmitters and provides those signals to the controller. The controller identifies the transmitter and tire on the first wheel based on the identification signal transmitted from the transmitter on the first wheel and determines, for each of the transmitters, whether the transmitter and the associated tire are located on one of the right-side wheels or one of the left-side wheels based on the rotation direction signal transmitted from the transmitter.

Abstract: A tire-information administration system includes a plurality of sensor modules installed in tires; at least one reception module configured to receive data from the sensor modules; and a central control module configured to command the reception module to acquire data from the sensor modules. The central control module includes a predetermined number of connection ports for the reception module, assigned in advance to each sensor modules; and a specifically configured control means.

Abstract: Wheel for a vehicle includes a wheel rim, a tire mounted on the wheel rim to define an inflatable interior compartment, a pump for pumping air into the compartment, and an energy generating system for generating energy upon rotation of the wheel to power the pump and cause the pump to pump air into the compartment. The energy generating system may include a first coil, a magnetized mass movable upon rotation of the wheel relative to and partly in a chamber surrounded by the first coil, and an energy storage or load device coupled to the first coil. Upon rotation of the wheel, the mass moves relative to the first coil imparting a charge to the first coil which is stored in the energy storage or load device and used to power the pump when needed.

Abstract: A tire information detecting apparatus includes an interrogator which transmits an interrogation signal toward a tire in a vehicle at a transmitting timing, and receives a reply signal including tire information at a receiving timing so as to process the signals. A responder is disposed in the tire and has a sensor excited by a predetermined frequency signal for detecting tire information so as to return the reply signal to the interrogator at the receiving timing in responding to the interrogation signal. A mixer unit receives the interrogation signal having a first signal and a second signal which is spaced the predetermined frequency away from the first signal, from the interrogator, and outputs a signal of the frequency difference between the two signals to the responder by mixing the first and second signals.

Abstract: A method for monitoring tire pressure of a system is disclosed. The method includes the steps of detecting a signal other than that of an in-use tire pressure signals and in response to the detection of the signal, maintaining the proper reception of the in-use tire pressure signals by a receiver.

Abstract: The invention relates to a method and a device for localising the position of at least two emission units, especially for monitoring at least one parameter for a plurality of wheels pertaining to a motor vehicle. The average power of the reception signals of a central evaluation and control unit (5) is detected. The aim of the invention is to improve the reliability of a correct localisation. To this end, at least two association criteria are used to associate the reception signals or emission units with positions or regions, when the examination of a reliability criterion for the first association criterion does not produce a sufficiently high reliability for the association carried out.

Abstract: A data communication device includes a receiving circuit configured to receive a data signal in an active state. An intermittent activation control circuit activates the receiving circuit into the active state in a predetermined time interval. A control unit operates in response to the data signal received by the receiving circuit. Also, the control unit controls the time interval of the intermittent activation control circuit.

Abstract: A tire administration system selects a frequency of a high reception probability, when a measured data request signal is transmitted from a receiver module (1) to a sensor module (3), or when a frequency of the data request signal is changed, so as to promptly acquire a measured data from the sensor module (3). The receiver module (1) transmits the measured data request signal to the sensor module (3), at a frequency used for a latest, successful acquisition of the measured data from a sensor module (3), transmits the measured data request signal, if the measured data cannot be acquired, repeatedly until the measured data can be acquired, and transmits, if the transmission number of the measured data request signal reaches a designated transmission number, the measured data request signal to the sensor module (3) at a frequency used for a second latest, successful acquisition of the measured data.

Abstract: In a vehicle's wheel position detecting apparatus, a first triggering device, attached to the vehicle's body, outputs a triggering signal including information indicating that the triggering signal is for front wheels. A second trigging device, attached to the body, outputs a triggering signal including information indicating that the triggering signal is for rear wheels. The first and second triggering devices output the triggering signals simultaneously. A transceiver is attached to each of the front and rear four wheels. Each transceiver receives the triggering signal, calculates a reception intensity of the triggering signal, stores both the reception intensity data and the information into a frame, and transmits the frame. A receiver, attached to the body, receives the frame and processes the received frame to read out both the data and the information and use the read-out data and information to detect the positions of the wheels.

Abstract: A method and device for locating the position, on the right or on the left, of a vehicle wheel. The wheel is equipped with two magnetic sensors having axes of maximum sensitivity lying in a plane that is secant to the axis of rotation of the wheel and which are offset from one another in this secant plane by a predetermined angle ?. As the vehicle moves in a given travel direction, a signal generated by the variation in a magnetic field is measured at the terminals of each of the magnetic sensors to deliver two periodic signals phase-shifted from one another by an angular value equal to (+ or ?) ?, this phase shift is used to determine the direction of wheel rotation, and from such direction and the travel direction, the location, on the right or on the left, of the wheel is deduced.

Abstract: A transmitter module has a sensor module that includes a plurality of sensors and operates intermittently, a signal processor module that permits transmission of an output of the sensor module to a receiver module at given permission timings, a radio transmission module that wirelessly transmits data when the transmission is permitted, and a power source that supplies power to each module. The signal processor module has a microcomputer and an interval timer that outputs a first timing signal when a count value corresponds to a set value. The microcomputer is activated by the first timing signal and changes the set value in a compare register according to a vehicle operation state.