Abstract: The present invention provides a small-sized pressure measuring module suitable for replacement of a tire, and a tire pressure monitoring system. The pressure measuring module detects pressure of air within a tire included in a wheel assembly attached to a vehicle body, and wirelessly transmits data on the detected pressure and a module ID of the pressure measuring module to a pressure monitoring device mounted on the vehicle body. The pressure measuring module has an antenna and an identification code. At least a portion of the antenna protrudes to the outside of the wheel assembly from the surface of a wheel included in the wheel assembly through a through-hole communicating with an inner space of the tire. The antenna wirelessly transmits the detected pressure value and the module ID to the pressure monitoring device. The identifier can be viewed from the outside of the wheel assembly and indicates the module ID.

Abstract: A method and system for calibrating speed of a vehicle having a plurality of wheels includes a wheel speed sensor coupled to each of the wheels for providing a first vehicle speed based on an average tire size associated with the plurality of wheels. A GPS sensor provides a second vehicle speed based on a change in position of the vehicle over a predetermined period of time. A control module automatically calibrates the speed of the vehicle based on a comparison of the first and second vehicle speeds.

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: In a method for ensuring safe tire emergency running operation in a motor vehicle that is equipped with tires that have emergency running properties when the tire pressure is greatly reduced or absent altogether, a device is provided for detecting an emergency running mode of the motor vehicle. The device for limiting the driving speed limits the driving speed of the motor vehicle whenever emergency running is detected.

Abstract: A wheel identifying apparatus includes first and second triggering devices located on the body of a vehicle, a plurality of transceivers each of which is located on one of the running and spare wheels of the vehicle, and a receiver and a wheel identifier both of which are located on the body of the vehicle. The first and second triggering devices continuously transmit first and second trigger signals, respectively. Each of the transceivers monitors the strength of either the first or second trigger signal thereat for a given length of time, and transmits a signal indicating variation in the monitored strength. The receiver receives and provides to the wheel identifier all the signals transmitted by the transceivers. The wheel identifier identifies, for each of the signals, the wheel on which the transceiver having transmitted the signal is located through a comparison between the variations indicated by the signals.

Abstract: Method of allowing control of a vehicle provided with at least two wheels in case of puncture of a tire, each wheel having a rim and a tire associated therewith, including the steps of inflating each tire to an operating pressure at a reference temperature; admitting a fluid compressed to a first pressure higher than the operating pressure of the tire at the reference temperature into at least one tank associated with at least one of the rims; bringing the tire into communication with the tank when the inner pressure of the tire is lower than the operating pressure by a predetermined first threshold value; measuring the inner pressure of the tire with a predetermined frequency; calculating a variation of the inner pressure in the time unit; generating an alarm signal when the variation of the inner pressure corresponds to a reduction and is higher than a predetermined value; and transmitting the alarm signal to the driver.

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 pressure monitoring system, that includes a plurality of the wheel state detection unit, provided at wheel of a vehicle, and that transmits detected wheel state information. A request signal transmitter transmits a request signal to request transmission of the detected wheel state information. When each wheel state detection unit receives the request signal, it transmits the detected wheel state together with the indication information indicating that the wheel state is detected in response to the transmission request signal. The ECU sets a determination threshold value for triggering an alert regarding tire pressure based on the detected wheel state information transmitted from the plurality of wheel state detection units.

Abstract: The present invention is directed to a wheel condition detection and signalling device. The device includes a chamber which is capable of being attached to a wheel of a truck to rotate therewith and a pendulum having significant mass and is rotatably mounted within the chamber in such a manner that the pendulum remains generally non-rotating during rotation of the chamber. The device also includes a detector means for detecting an unacceptable condition of the wheel and emitting a signal dependent upon such condition and a transmitter for transmitting that signal to a receiver. The chamber carries a wire coil which is mounted on a core having two outside parallel arms provided with end faces.

Abstract: An electronic vehicle tester includes a battery tester configured to measure a parameter of a battery of a vehicle. A tire tester is configured to receive a parameter of a tire of the vehicle. A wireless receiver can be configured to receive pressure information from a transmitter associated with a tire of a vehicle.

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.

Abstract: A method is provided for determining tire location in a tire pressure monitoring system having the steps of generating an initiation frequency signal having a controllable output adapted to be received by a selected one of a plurality of tires of the tire pressure monitoring system. At least two tires of the tire pressure monitoring system have associated initiation signal receivers. The method also includes transmitting a response signal from the selected tire receiving the initiation signal, the response signal having at least a unique identification signal portion associated with the selected tire. The method also receives the transmitted response signal and associates the identification signal with a location of the selected tire.

Abstract: A pressure sensing apparatus includes a pressure sensor for detecting tire pressure and generating a signal corresponding to the tire pressure, and an electrically conducting air valve seat connected to the pressure sensor for signal transmission therethrough to a transmitting antenna. The antenna has a metal cap connected to the air valve seat, at least one annual substrate defining a center coupling hole into which the cap is inserted, and at least one metal conducting wire spirally mounted in the at least one substrate around the center coupling hole. The metal conducting wire has an inner end exposed to a periphery wall of the center coupling hole of the substrate and electrically connected to the cap.

Abstract: A tire monitor for mounting to a vehicle as part of a remote tire monitoring system includes a tire condition sensor to produce a tire condition signal, a controller coupled to the tire condition sensor to control operation of the tire monitor, and a radio circuit coupled to the controller to transmit radio signals based at least in part on the tire condition signal. A shock sensor is coupled to the controller of the tire monitor to produce a motion signal indicating motion of the tire monitor.

Abstract: A tire parameter sensing system (12) for a vehicle (10) comprises a vehicle-based unit (42) for receiving parameter signals. A tire-based unit (34) is associated with a tire (16) of the vehicle (10) and rotates with the tire (16). The tire-based unit (34) is located in a communication zone (134) for communicating with the vehicle-based unit (42) through only a portion of each rotation of the tire (16). The tire-based unit (34) is configured to sense a parameter of the tire (16) and to transmit a parameter signal (54) indicative thereof. The system (12) also comprises means (78) for monitoring the rotation of the tire and for providing rotation information indicative of the monitored tire rotation. The tire-based unit (34) is responsive to the rotation information for transmitting the parameter signal (54) while the tire-based unit (34) is located the communication zone (134).

Abstract: A valve device includes a metal tube fixed to a tire rim of a vehicle. A valve is mounted in an end of an air passageway of the metal tube. A transmitter includes two switches respectively connected to two contact members fixed on the metal tube. A Bourdon tube includes a fixed end in communication with the air passageway of the metal tube and a movable end. When a tire pressure of the tire is in a normal range, the movable end of the Bourdon tube is between the contact members, leading to an open circuit. When the tire pressure is too high or too low, the movable end of the Bourdon tube is in contact with one of the contact members. One of the switches is turned on to activate the transmitter to send a signal for reminding the driver of the abnormal tire pressure.

Abstract: A sensor node arrangement in a wireless network, includes a sensor to sense information, an RF transceiver to communicate the information to at least one element of the wireless network, and a coil to establish a secondary communications channel with a handheld device via inductive coupling, the secondary communications channel used, for example, to receive, during installation of the sensor node arrangement, a node identifier of the sensor node arrangement.

Abstract: A wireless transmission method for tire detection signals increases the percentage of successfully received tire detection signals received by the receiving unit and extends the usage life of batteries. A delay time for emitting the tire detection signals via the detection unit is calculated according to the acceleration of the tire. The operation time for one rotation of the tire is divided into several equal periods. Then, the tire detection signals are emitted to the receiving unit via a wireless transmission method.

Abstract: A tire pressure detecting apparatus detects the pressure and location of a tire in a vehicle and notifies a person in the vehicle of each tire pressure and the location of the tire linked with the tire pressure. Terminals are arranged on the tires of the vehicle, respectively. Receivers are arranged in the vicinities of the tires, to receive tire pressure data signals transmitted from the terminals and measure reception levels of the received signals. An ECU is connected to receive the tire pressure data and signal levels from the receivers. The ECU obtains only one piece of the tire pressure data having a maximum signal level from the receiver showing the maximum signal level and relates the obtained tire pressure data is of the tire with the maximum-signal-level receiver. A display displays the pressure and location of each tire determined by the ECU.

Abstract: A pressure detection sensor for detecting a tire internal air pressure and a wheel side communication device for transmitting a detection result of the pressure detection sensor using a preset transmission mode are provided on each wheel. The detection result from the pressure detection sensor is transmitted to an ECU via a vehicle body side communication device provided on a vehicle body. The ECU is able to notify a transmission mode determination device provided on each wheel that adjustment of the tire internal air pressure is being performed by manipulating a state of the tire internal air pressure. The transmission mode determination device determines a transmission mode to be used by the wheel side communication device such that a transmission frequency of a notification related to the occurrence of an abnormality of the wheel is reduced while adjustment of the tire internal air pressure is being performed.

Abstract: A tire air pressure monitoring system is provided with at least one trailer-use receiving unit, which is mounted at a rear end of a tractor head to receive radio wave sent by multiple tire air pressure sending units. The tire air pressure sending units are respectively attached to wheels of a trailer. The trailer-use receiving unit, having a directional antenna, is oriented to have a stronger receiving sensitivity with respect to a direction of the trailer than other directions.

Abstract: A tire information communication system mounted on a vehicle includes a tire-pressure detector mounted on a tire wheel for detecting a pressure of a tire and transmitting a result of detection, a tire monitor mounted on a vehicle body for obtaining information about tire pressure from the tire-pressure detector, a tire transmission circuit provided in the tire-pressure detector for applying AC voltage containing information about tire pressure between the tire wheel and an annular conductor of the tire so that a radio wave is radiated from the annular conductor, a vehicle ground isolation provided in the tire monitor so as to receive the radio wave from the annular conductor thereby to be capable of generating AC voltage between the vehicle ground and itself, and a body-side receiving circuit provided in the tire monitor and connected to the vehicle ground and the vehicle ground isolation respectively for obtaining the information about the tire pressure from the AC voltage generated between the vehicle groun

Abstract: A device for interrogating at least one data sensor positioned at least one of within a vehicle tire and adjacent to a vehicle tire. The device includes a housing, remotely located from the at least one data sensor having a processor positioned therein. Means for sending and receiving at least one data signal for receipt by said sensor is connected to the processor. A least one input button is connected to the processor for activation thereof. A display is connected to the processor for displaying data thereon. The sensor generates, in response to the at least one data signal, a response signal having data corresponding to at least one of a sensed and a stored data value and the response signal is received by the sending and receiving means for display on the display.

Abstract: A tire information communication system mounted on a vehicle includes a tire-pressure detector mounted on a tire wheel for detecting a pressure of a tire and transmitting a result of detection, a tire monitor mounted on a vehicle body for obtaining information about tire pressure from the tire-pressure detector, a tire transmission circuit provided in the tire-pressure detector for applying AC voltage containing information about tire pressure between the tire wheel and an annular conductor of the tire so that a radio wave is radiated from the annular conductor, a vehicle ground isolation provided in the tire monitor so as to receive the radio wave from the annular conductor thereby to be capable of generating AC voltage between the vehicle ground and itself, and a body-side receiving circuit provided in the tire monitor and connected to the vehicle ground and the vehicle ground isolation respectively for obtaining the information about the tire pressure from the AC voltage generated between the vehicle groun

Abstract: A tire air pressure monitoring system is provided that comprises a transmitting device, a receiving device, and a tire identification number registration device. The transmitting device is mounted on a wheel of a vehicle, and configured and arranged to wirelessly transmit a signal indicative of at least tire air pressure information of a tire coupled to the wheel and a tire identification number assigned to the wheel. The receiving device is mounted on the vehicle, and configured and arranged to receive the signal transmitted from the transmitting device. The tire identification number registration device is configured to estimate a position of the wheel with respect to the vehicle based on correlation information corresponding to an extent of a correlation between strength of the signal and a tire rotational angle of the wheel, and to register the tire identification number with the position of the wheel.

Abstract: A wheel sensor communication system (10) includes a primary coil (30) and a secondary coil (32), which operate as an electromagnetic transformer which is uncoupled mechanically but coupled electrically through a vehicle wheel assembly rotational interface. The electromagnetic transformer provides for the transfer of energy and data from a sensor (18) to a controller (14).

Abstract: A wireless tire pressure sensing system for an aircraft comprises: dual resonant circuits mounted to a wheel of the aircraft, each resonant circuit comprising: a variable capacitance sensor and a wire loop of a predetermined inductance coupled thereto, one capacitance sensor for monitoring the pressure of a tire mounted to the wheel, and the other capacitance sensor operative as a reference to the one capacitance sensor; an interrogating circuit magnetically coupleable to the dual resonant circuits and operative to induce magnetically a variable frequency current in the dual resonant circuits, the one resonant circuit responding to the induced current with an E-field signal at a first resonant frequency commensurate with the capacitance of the one sensor, and the other resonant circuit responding to the induced current with an E-field signal at a second resonant frequency commensurate with the capacitance of the other sensor; a receiving circuit E-field coupleable to the dual resonant circuits and operative t

Abstract: A tire pressure monitoring device includes a planar circuit board, a sensor, a controller, and an antenna. The sensor is mounted on the circuit board, is adapted for detecting a pressure of a pneumatic tire of a vehicle, and is operable so as to generate a signal that corresponds to the detected pressure of the pneumatic tire of the vehicle. The controller is mounted on the circuit board, and is operable so as to control operation of the tire pressure monitoring device. The antenna is mounted on the circuit board, is operable so as to transmit the signal generated by the sensor, and includes a spiraling antenna section that lies on a plane parallel to the circuit board.

Abstract: To issue a warning against an improper (a lowered) air pressure in accordance with a vehicle state and driver's presence/absence, the warning system includes air pressure measuring means for measuring an air pressure of a tire of a vehicle; air pressure judging means for judging whether or not the air pressure is proper; warning issuing means for issuing, if a result of the judgment is negative, a warning; and driver on-board judging means for judging whether or not a driver is on board the vehicle; and driver detecting means for detecting whether or not the driver is in the proximity to the vehicle. If the results of the judgments by the air pressure judging means and the driver on-board judging means are negative and a result of the detection by the driver detecting means is positive, the warning issuing means issues the warning outside the vehicle.

Abstract: A system and method for monitoring vehicle tire pressure. A tire pressure monitor for each tire includes a pressure sensor for sensing tire pressure, a transmitter for transmitting a tire pressure signal representative of the sensed tire pressure, and a batter providing power to the transmitter. To conserve battery power, each tire pressure signal transmitted by the transmitters includes a wake-up signal only when the vehicle has been stationary for a predetermined time period. The wake-up signal ensures receipt of the tire pressure signal by a vehicle mounted receiver alternating between active state and inactive states.

Abstract: A tire parameter sensing system (12) for a vehicle (10) having a plurality of tires (16, 18, 20, 22) comprises a plurality of tire-based units (34, 36, 38, 40). Each tire-based unit (34, 36, 38, 40) being configured to receive initiation signals and, in response thereto, to transmit response signals (54, 56, 58, 60). A vehicle-based unit (42) receives the response signals (54, 56, 58, 60) and transmits the initiation signals (90). A plurality of signal masking devices (44, 46, 48, 50) is coupled to the vehicle-based unit (42). The signal masking devices (44, 46, 48, 50) have associated tire locations on the vehicle (10) and are actuatable for masking the initiation signals (90) near the associated tire locations. The vehicle-based unit (42) controls the signal masking devices (44, 46, 48, 50) so as to control the tire location from which a tire-based unit responds to the initiation signals (90).

Abstract: Sensor package systems and methods are disclosed, which include a quartz sensor package encapsulated by an overmold material. A surface acoustic wave sensing element and one or more bonding pads can be integrated with the quartz sensor package. Additionally, one or more antennas can be respectively bonded to the quartz sensor package at the bonding pads, such that the antennas communicates electrically with the surface acoustic wave sensing element and permits wireless interrogation of the quartz sensor package including the surface acoustic wave sensing element from an external wireless source.

Abstract: A method of localizing the location of a received signal from a tire pressure sensor includes sending an AM identification signal. The AM signal is adjusted for speed such that the frequency of the signal equals a constant multiplied by the speed of the vehicle. Each of the tire locations on a vehicle have an expected sequence of black-out points in the signal received by a receiver at any point on the vehicle. That is, given a particular vehicle design, the AM signal described above would be received at a receiver with an expected sequence of received peaks and black-out points. Since the frequency of the signal is adjusted for speed, the received signal will accurately allow the location of black-out points to be utilized to identify the tire location for a particular signal.

Abstract: The invention discloses a method for compensating temperature in a system for tire pressure monitoring which is especially implemented by detecting a tire pressure and/or by detecting a tire pressure loss. The method is especially characterized in that the temperature is compensated by determining the gas temperature in the tire by way of at least two items of temperature information and by taking the determined temperature as a basis for said tire inflation monitoring. One significant advantage of this method involves that externally active temperature changes, such as a heat-emitting brake disc causing the wheel rim of the tire and, hence, also a temperature sensor arranged thereat to be heated more intensely than the gas in the tire, do not lead to an indication error with respect to the tire pressure (or a spurious alarm).

Abstract: A dual-sectional monitor signal transmission module for Wireless Tire Pressure Monitoring Systems. On one side of this monitor signal transmission module, an air tap is designed, which can be assembled and fixed in the hole of the tire rim. This Monitor Signal Transmission Module and the air-tap are a dual-sectional combination to allow the air-tap to be fittingly snapped into the hole on the tire rim. Moreover, a mounting seat is designed on the Monitor Signal Transmission Module at the end where the air-tap is to be positioned so that the air-tap and the outer-end of the mounting seat can be connected in a counter-screw setup. The Monitor Signal Transmission Module can be easily detached with just a simple step of unscrewing the air-tap when replacing tires.

Abstract: A tire characteristic monitoring method allows automatic programming of tire position information in a remote tire pressure monitoring system (10). The method includes, from a remotely located exciter (16) using a primary coil (18) to transmit a relatively low frequency signal to a secondary coil (L1) of a tire monitor (12) associated with a tire of a vehicle. The method further includes the step of, at the tire monitor, in response to the relatively low frequency signal, transmitting a relatively high transmitting signal to convey data. The data are received at the exciter and subsequently loaded into a receiving unit (14) of the vehicle.

Abstract: A wireless tire-pressure monitor mainly has a cylindrical body, a seal assembly, a screw and a sensor. The cylindrical body is mounted through a hole in a wheel rim wall and has an air passage, an interior thread defined in the air passage and a flange formed around the body. The seal assembly is mounted around the body on opposite sides of the wheel rim wall and abuts the flange on the body. The screw is screwed into the air passage and squeezes the seal assembly against the wheel rim wall. The sensor is mounted on the body. Therefore, the wireless tire-pressure monitor is easily and securely attached to the wheel rim to detect pressure and temperature of the wheel. Further, the sensor is positioned outside of the wheel rim to prevent the wireless detecting signals from being interfered by the wheel rim or wheel.

Abstract: A fluctuation warning unit for issuing a warning when fluctuations of the tire pressure per unit time exceed a predetermined threshold fluctuation, and a detected value warning unit for issuing a warning when a detected value of the tire pressure has fallen to a value below a predetermined threshold detected value are provided. For example, air leakage may be recognized rapidly, and abnormalities of air pressure may be recognized even when a faint air leakage occurs wherein fluctuations of the tire pressure per unit time do not exceed the predetermined threshold fluctuation.

Abstract: A tire monitoring system providing tire status and notifying or warning the vehicle operator of early detection of imminent tire failure and performance degradation; thus improving safety by preventing blowouts from occurring, lengthening tire life by encouraging preventive maintenance, and improving fuel mileage by encouraging the operator to fill the tire to its proper pressure or repair it. The system monitors temperature of the rim of the wheel to which the tire is attached, such temperature being transmitted to the vehicle operator or other interested parties via means such as radio frequency.

Abstract: A tire pressure monitoring system having a monitoring unit that receives the output of a transmitted pressure sensor through a receiving antenna, and compares the output with a predetermined value to determine whether the tire pressure is proper, and informs a result of the determination to an operator by an indicator or alarm section connected to an onboard battery through an ignition switch. In the system, an operating switch is installed in a vehicle compartment to be operable by the operator for supplying the operating power to the indicator by connecting it to the battery, while bypassing the ignition switch. Alternatively, a portable terminal device to be carried by the operator is connected to the monitoring unit in such a manner that the monitoring unit transmits the result of the determination to the portable terminal device to inform the result of the determination to the operator by a second indicator provided at the portable terminal device.

Abstract: A method for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of wheel speed information obtained from wheels attached to a vehicle. The method includes the steps of: detecting wheel speed information of the respective tires; storing the wheel speed information of the respective tires; obtaining a vehicle body velocity of the vehicle; obtaining vehicle information of the vehicle during running such as driving force, wheel torque or slip rate; calculating a judged value of decompression; and detecting decrease in air-pressure of a tire upon calculating a multiple correlation coefficient for the judged value between the vehicle body velocity and the vehicle information and comparing the multiple correlation coefficient with a specified threshold. It is possible to accurately detect decompression of a tire.

Abstract: When a vehicle travels a bend, tire pressure measurement devices (2) are assigned to wheel positions. For this purpose, it is determined by means of ABS (4) whether it is a left-hand or right-hand bend. Wheel revolution counts are then measured in each tire and sent along with identification codes to a central analysis unit (3). There the wheel revolution counts are collated with the bend data determined by the ABS. The two higher wheel revolution counts are then assigned to the side of the vehicle on the outside of the bend and the two lower wheel revolution counts are assigned to the other side of the vehicle.

Abstract: A receiver of a tire status monitoring apparatus which can specify tire mounting positions and does not require initial registration work. The tire status monitoring apparatus includes a plurality of transmitters which are provided on the respective tires of a vehicle and transmit data indicating statuses of the respective tires. The data includes an identification code to identify each tire, and the receiver is supplied with an activation signal to activate a drive source of the vehicle. The receiver includes a reception unit which receives the data from the transmitters, and a control circuit which is connected to the reception unit and collates the identification code included in the data upon detection of the activation signal and specifies, based on the identification code, each transmitter which has transmitted the data.

Abstract: Apparatus and method for post-cure application of electronics to a tire includes the steps: forming an antenna wire into a predetermined shape having first and second free ends; creating a transponder splice region between the first and second free antenna ends, incorporating transponder splice region identification indicia; curing the antenna wire into a tire during a tire manufacturing procedure; locating the transponder splice region by means of the transponder splice region identification indicia; and splicing the antenna wire ends to a sensor in a post-cure procedure. The transponder splice region identification indicia may include sandwiching a junction box or the overlapped ends of the antenna wire or wires between layers of select material that will not bond to the tire inner liner or antenna cover compounds and incorporating an air pocket in the sandwiched region.

Abstract: A transmitter for a tire state monitoring apparatus that is easily connected to a wheel in an optimal manner. The transmitter includes a valve stem connected to a wheel to which the tire is attached. Electric components are mounted on a circuit board to detect the state of the tire. A casing accommodates the circuit board in the tire. The casing faces toward an outer circumferential surface of the wheel. A connecting portion connects the casing to the valve stem pivotally about a line perpendicular to the axial direction of the valve stem. A pressing mechanism presses the casing toward the outer circumferential surface of the wheel to restrict pivoting of the casing.

Abstract: A vehicle wheel information obtaining apparatus for obtaining wheel information relating to a wheel of a vehicle. The apparatus includes: (a) a wheel state detector which detects a state of the wheel; (b) a transmitter which is provided on the wheel and which transmits a wheel data set containing a wheel state data representing the detected state of the wheel and a wheel identification data identifying the wheel; (c) a receiver which is provided on a vehicle body and which receives the wheel data set transmitted by the transmitter; (d) a data processor which processes the wheel data set received by the receiver; and (e) a communication-intensity reducing device which reduces a transmission strength of the transmitter or/and a reception sensitivity of the receiver, such that the transmission strength or/and the reception sensitivity is lower when the data processor is in an identification-data registering mode, than when the data processor is in a wheel-state data obtaining mode.

Abstract: System for monitoring the tires of a vehicle, comprising a device for automatic location of a radio transmitter, comprising a first radio reception channel having a first aerial and a second radio reception channel having a second aerial, the first and second aerials defining an axis D1, a first means of comparison of the phases of a radio signal received by the first and second aerials in order to determine whether the radio signal received by the first aerial is ahead of phase, behind phase or has an identical phase relative to the radio signal received by the second aerial and a means of processing the results originating from the first means of comparison intended to indicate the position of the radio transmitter relative to the said aerials.

Abstract: A method and system for monitoring and reporting vehicle tire pressure information. The system includes tire pressure monitors mounted to the tires of a vehicle. The tire pressure monitors detect tire pressure information from their respective tires and transmit that information to transponders that are fixedly-mounted to the vehicle. Each tire pressure monitor corresponds to a single transponder. When a tire pressure monitor transmits tire pressure information, the corresponding transponder receives the signal and transmits the tire pressure signal along with a unique transponder identification code to a vehicle central system controller. Based upon the transponder identification code, the central controller associates the tire pressure information with a particular tire location. However, under certain conditions, a transmitted tire pressure signal is received by one or more of the non-corresponding transponders as well as the corresponding transponder.

Abstract: A wheel assembly includes a wheel having a rim which is adapted to receive a tire. The wheel carries a sensor for measuring pressure inside the tire. The wheel is mounted so as to rotate around a spindle. In addition a communication device is located between the sensor and a device which is associated with the spindle for using measurements that are performed by the sensor. The communication device comprises a radio transmission device which includes a rotary antenna carried by the wheel and a fixed antenna that is carried by the spindle.

Abstract: Method and apparatus for mounting a transponder module (400, 702, 951, 1000, 1020, 1751, 1752, 1852, 1852?, 1951, 1951a) and a separate antenna (1520, 1520?, 1520?, 1620, 1720, 1820, 1920) to an inner surface (1504, 1504?, 1504?, 1704, 1804) of a pneumatic tire (312, 650, 1204, 1350, 1350?, 1550, 1550?, 1550?), and for coupling the transponder module to the antenna by coupling coils which are included with the transponder module (450, 760, 953, 1004, 1024) and the antenna (750, 750?, 866, 938, 968, 1538, 1538?, 1538?, 1638, 1638?, 1738, 1738?, 1838, 1838?, 1938). The transponder module mounting methods generally allow it to be inserted, removed, or accessed for maintenance at any time during the tire's life cycle, and allow sensing access to the tire's inner atmosphere.