Abstract: A method of estimating the occurrence of a specific tire pressure deviation between actual and nominal pressure values for one or a plurality of wheels (i) is provided. One or more wheel radius analysis measurement values (?R) are subsequently obtained from a wheel radius analysis component (104), wherein the wheel radius analysis measurement values (?R) are related to single wheel radius values (?ri) of which each is indicative of the wheel radius of a particular wheel (i). One or more wheel vibration data values (?ƒi) are subsequently obtained from a wheel vibration analysis component (102), wherein each of the wheel vibration data values (?ƒi) is indicative of a vibration phenomena in the time dependent behavior of the rotational velocity of a particular wheel (i).

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 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: Arrangement for providing a boosted signal from a signal-generating device, such as a SAW device or an RFID tag, including an antenna and a circulator having a first port connected to the antenna to receive a signal therefrom and a second port connectable to the device to provide a signal thereto and receive a signal therefrom. The circulator amplifies the signal from the antenna and the signal received from the device such that a twice-amplified signal is directed to the antenna. A receiving and processing module transmits a signal to the antenna causing the antenna to generate its signal and receive a signal from the antenna derived from the twice-amplified signal. Various pumping systems for vehicle tires and electricity generating systems which generate energy upon rotation of a tire are also disclosed.

Abstract: A tire pressure indicating apparatus has a plurality of interconnected concentric cylindrical parts including, a base, a flexible diaphragm providing an annular U-shaped wall, a valve body, an indicator sleeve, a cover and a spring, the spring compressively engaged between the cover and the indicator sleeve, such that a pressure differential across the diaphragm acts in opposition to the spring to move the indicator sleeve axially so as to display a colored surface of the sleeve through a window in the cover, or an alternate color uncovered by sleeve movement.

Abstract: Each sensor is provided with an emitter and the vehicle is provided with a corresponding receiver adapted to receive signals emitted by each sensor. The receiver is provided with at least one antenna disposed such that it is not located substantially equidistantly from the sensors, the antennas being located on a same side of the vehicle. The location of the sensors is carried out by analyzing the power of the field received by the receiver of each antenna for each sensor, the field power received by one antenna being the greater, the nearer to the antenna is the sensor that emitted the corresponding signal.

Abstract: A wheel-state obtaining apparatus for a vehicle, including wheel-side devices (10–16) each having an air pressure sensor (32) for detecting an air pressure of a wheel tire of the vehicle, and a body-side device (18) having receiver antennas (20–26) and arranged to receive wheel-side information from the wheel-side devices through the receiver antennas and extract air-pressure information representative of the detected air pressure, that is, detected-air-pressure information, and wherein the body-side device includes an estimating portion (54) which is operable, in the event of a failure of any of the receiver antennas to receive the wheel-side information, to estimate the tire air pressure on the basis of detected speeds of the wheel, and obtain estimated-air-pressure information representative of the estimated air pressure.

Abstract: A system for sensing at least one characteristic parameter of a tyre fitted to a vehicle includes a movable unit and a fixed unit. The movable unit is combined with the tyre and includes a device for sensing the at least one characteristic parameter, a device for transmitting a signal out of the tyre that relates to the at least one characteristic parameter, and a device for generating electrical energy. The fixed unit is combined with the vehicle and includes a device for receiving signals from the movable unit. The electrical energy generating device is capable of supplying electrical energy to the sensing device and to the transmitting device. The electrical energy generating device includes a capacitor that charges itself with electrical energy in response to mechanical stresses applied to the tyre. The movable unit and a vehicle wheel are also disclosed.

Abstract: A tyre pressure monitoring or warning system comprising at least one receiver responsive to signals transmitted by transmitters associated with one or more tyres. The system including a memory which stores a list of identity tags captured by the receiver, and a list of associated confidence values for each identity tag indicative of the confidence that the stored identity tag corresponds to a transmitter that belongs to the vehicle. The list may be split into a member and a candidate list comprising those identity tags that are deemed to refer and that possibly refer respectively to transmitters associated with the vehicle respectively. Initiators may be provided to initiate transmission from the transmitters in order to locate the position of each tyre.

Abstract: A tire air-pressure alarming device includes wheel speed sensors for detecting wheel speeds of wheels of a motor vehicle and also includes a microcomputer-base control device and an alarming unit. The control device is programmed to execute function steps of: deriving a decision value based on the wheel speeds detected by the wheel speed sensors; judging the occurrence of air-pressure drop of the tires constituting wheels, based on the decision value; and outputting a command when the occurrence of the air-pressure drop of the tires is judged. The alarming unit is responsive to the command from the control device thereby to raise an alarm indicating the occurrence of the air-pressure drop of the tire. The tires are monitored by the tire air-pressure alarming device, wherein the control device is also programmed to execute a function step of standardizing the speed dependency of a rolling radius of the tires thereby to standardize the performance in judging the air-pressure drop of the tires.

Abstract: A method and apparatus are provided for determining pressure within a tire mounted to a vehicle, wherein the tire is coupled to a tire pressure monitoring system including a sensor coupled to a transmitter, the sensor configured to sense tire pressure and the transmitter configured to transmit the sensed tire pressure to a receiver. First, a first tire pressure is sensed. Then, a calculation is made as to whether the sensed first tire pressure is greater than a predetermined pressure threshold, equal to the predetermined pressure threshold, or less than the predetermined pressure threshold. Next, an indication is provided external to the vehicle that the sensed first tire pressure is greater than a predetermined pressure range, within the predetermined pressure range, or less than the predetermined pressure range.

Abstract: A transmitter for a tire condition monitoring apparatus includes a pressure sensor for detecting of the internal pressure of a tire, a transmission circuit for generating a transmission signal, and a transmission antenna for transmitting the transmission signal as a radio wave. The transmission antenna is a planar antenna and includes a plate-like transmission conductor for transmitting the radio wave. The transmission antenna is configured such that the radio wave transmitted from the transmission conductor becomes a circularly polarized wave. As a result, the transmitter has a superior transmission performance and a reduced size.

Abstract: A vehicle C is provided with four wheel speed sensors VS (VSfl, VSfr, VSrl, VSrr) (wheel vibration detection means) for detecting wheel speed V (Vfl, Vfr, Vrl, Vrr) at respective four wheels W (left and right front wheels Wfl, Wfr and left and right rear wheels Wrl, Wrr). When the tire pressure is in the normal value, a tire pressure monitoring system 1 prepares vibration frequency reference spectrum data for predetermined vehicle speed bands based on the detection values of each wheel speed sensor VS. The tire pressure monitoring system 1 compares the current vibration frequency spectrum data and the vibration frequency reference spectrum data corresponding to the current vehicle speed band, and determines that the tire is underinflated if the comparison result exceeds a predetermined value.

Abstract: A sensor housing assembly for mounting a tire pressure sensor module within the pressurized cavity of a wheel and tire assembly includes a central housing that includes a housing bottom and defines a cavity therein. A bobbin cover is coupled to the central housing. The bobbin cover and the central housing are mountable to a mounting surface on the wheel. The bobbin cover and the central housing bottom include curved mounting surfaces that are complementary to a curvature of the mounting surface on the wheel. At least one bobbin assembly is received in the bobbin cover. The bobbin assembly is substantially straight and coupled to the central housing at a downward angle toward 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: An apparatus and method for measuring gas flow rates and an improved automatic vehicle tire inflation system which utilizes the inventive gas flow measurement apparatus and method. The gas flow measuring apparatus and method utilize a porous media material effective for creating an appropriate pressure differential relative to the gas flow rate.

Abstract: A tire pressure monitoring system as described herein leverages a real-time onboard vehicle mass estimate to determine whether tire pressure is appropriate for the current loading conditions. The system is suitable for use with vehicles having two or more placard tire pressures (with two or more corresponding tire loading capacities). The system can notify the driver to adjust the tire pressure to the proper placard tire pressure for the given load conditions, and/or initiate automatic inflation or deflation by an onboard tire inflation system.

Abstract: A transmitter in an apparatus for monitoring a condition of a tire attached to a wheel of a vehicle is fixed to the wheel such that the transmitter faces an outer circumferential surface of a wheel rim. The transmitter includes a circuit portion that detects the condition of the tire. The transmitter includes a casing that accommodates the circuit portion, and a leg that extends from the casing toward the outer circumferential surface of the wheel rim. The extended amount of the leg is adjustable such that the leg contacts the outer circumferential surface of the wheel rim when the transmitter is fixed to the wheel. Therefore, the transmitter is mounted to the wheel such that legs of the casing abut against the wheel rim regardless of the size of the wheel.

Abstract: A vehicular remote control system has a mobile unit, a vehicle unit for establishing bidirectional wireless communication with the mobile unit, wherein the vehicle unit is able to transmit a wireless signal to the mobile unit through transmission antennas provided at a plurality of positions of a vehicle, and operational intention detector, provided at the plurality of positions of the vehicle corresponding to the transmission antennas, for detecting operational intention of a user approaching the positions. When a user's operational intention is detected, a predetermined request signal is transmitted from the vehicle unit to the mobile unit through a first transmission antenna, and the vehicle unit transmits an interrupt signal for preventing reception of the request signal, through a second transmission antenna.

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 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: A vehicle monitoring system comprises a tire pressure sensor, a transmitter coupled to the tire pressure sensor for wirelessly transmitting a signal indicative of a tire pressure; and a receiver for receiving the signal indicative of the tire pressure and for receiving a signal of a remote keyless entry device. The system further comprises a controller coupled to the receiver for processing the signal indicative of the tire pressure and outputting a status signal, and a status indicator for receiving the status signal and indicating a tire pressure status according to the status signal.

Abstract: A transmitter is mounted on a wheel of a vehicle by a jig of an automatic mounting machine. The transmitter has a measuring-transmitting portion, a valve stem, and a casing. The measuring-transmitting portion measures data representing the conditions of the tire and transmits data. The valve stem is inserted into the wheel and allows air to flow into the tire. The casing accommodates the measuring-transmitting portion, and has a recessed portion. The jig of the automatic mounting machine is engaged with the recessed portion when the automatic mounting machine holds the valve stem. Therefore, even a valve stem with the casing is easily attached to a valve hole of the wheel by using the automatic mounting machine.

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: In an internal memory of a reception controller such as, for example, a ROM, a correction table is stored for correcting air pressure data. The reception controller receives a signal representing vehicle speed from a speedometer of the vehicle. The reception controller obtains a correction value from the correction table on the basis of the vehicle speed signal to add and deduct the correction value obtained and the air pressure data received. For this reason, the reception controller can obtain corrected air pressure data.

Abstract: A method for alarming decrease in tire air-pressure in which decrease in tire air-pressure is determined on the basis of rotational velocity information of a wheel of a vehicle. Respective thresholds for determining whether judgment of decrease in tire air-pressure is to be made or not are changed depending on magnitude of driving torque of the vehicle when the vehicle is performing turning movements. It is possible to improve the detection accuracy without issuing an erroneous alarm even in the case where a large driving force is applied when the vehicle is, for instance, running on a climbing road or when it performs trailer towing.

Abstract: A passive keyless entry device is constructed by a car mounting device mounted to an automobile, a portable device and transmitter-receivers for monitoring a tire pneumatic pressure. The car mounting device has a low frequency signal transmitting section for transmitting a request signal to the portable device and the transmitter-receivers for monitoring the tire pneumatic pressure, a receiving section for a keyless entry for receiving an answer signal responsive to the request signal from the portable device, a receiving section for monitoring the tire pneumatic pressure for receiving the answer signal responsive to the request signal from the transmitter-receivers for monitoring the tire pneumatic pressure, and a controller for forming the request signal and controlling the operation of a door lock mechanism in response to the answer signal and displaying tire pneumatic pressure information.

Abstract: A system for monitoring conditions within a tire includes a sensor assemblies (14). The sensor assemblies (14) emit a transmission (26) containing information indicative of conditions within a tire to a receiver (16). The transmission (26) from the sensor assemblies (14) includes an amplitude shift key wake up portion and various data packet portions. The data packet portions are separated by a variable interval to prevent collisions of transmissions at the receiver.

Abstract: A device for quality testing of a body comprising a surface comprising a structuring bounded by edges and a substantially edge-free unevenness, wherein the structuring illustrates a quality impairment and wherein the unevenness illustrates a potential quality impairment, includes a means for generating a height representation, wherein the height representation of the surface includes the structuring and the unevenness. A means for calculating a variation representation calculates the variation associated to the point for every point of the height representation, so that at a boundary of the structuring a high variation is obtained, while at a boundary of the unevenness a low variation is obtained. A means for detecting regions which are potentially quality affecting detects regions as potentially quality-affecting which comprise a variation which is smaller than a predetermined variation threshold value regarding its magnitude.

Abstract: A system for facilitating training of a tire pressure monitoring system on a vehicle by providing an indication to the exterior of the vehicle. The system includes a receiver circuit configured to detect a wireless message including a tire sensor identifier, a memory configured to receive and store a number of tire sensor identifiers, at least one external indicator on the vehicle configured to provide an indication to the exterior of the vehicle, and a control circuit configured to provide a control signal to the external indicator on the vehicle to indicate to a user to actuate a tire sensor transmitter.

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: Tires of wheels of a vehicle incorporate detectors that detect the pneumatic pressures and transmit them wirelessly to a plurality of receivers installed on the vehicle. A monitoring device monitors the pneumatic pressures in the tires based on the tire data obtained by the receivers. The receivers and the monitoring devices are connected together through a single communication line, and the monitoring device obtains tire data from the receivers by polling. For each receiver, a receiver ID necessary for the communication with the monitoring device of the vehicle-side is set through a connector that connects the single communication line and the power source line to the receiver.

Abstract: An apparatus for alarming a decrease in tire air-pressure which alarms the decrease in inner pressure of the tire by using a judged value calculated based on wheel speed information obtained from tires fitted to a four-wheeled vehicle. The apparatus comprises calculating means for calculating the judged value based on the wheel speed information on each of the tires, the calculating means being connected to one of on-vehicle LANs, via which the wheel speed information on each of the tires is transmitted. The calculates means captures the wheel speed information on each of the tires via one of the on-vehicle LANs. The wheel speed information is converted into the digital data, which is then captured into the apparatus for alarming the decrease in tire air-pressure via the on-vehicle LAN, thus remarkably reducing the number of lines laid in the vehicle in comparison with the prior art.

Abstract: An arrangement having a device for measuring the tire pressure in a pneumatic tire, wich device is enclosed in a casing which is located inside the pneumatic tire when the pneumatic tire has been mounted on a wheel and also having spring acting resiliently upon the casing and a holder for the spring, which is to be fixed to the wheel. According to the invention, the spring and the casing are so designed and adapted one to the other that the casing finds support on the holder and is clamped for this purpose between the spring and the holder.

Abstract: A dual purpose key fob has manipulable keys for, in a normal mode, locking and unlocking a vehicle and keys for opening a vehicle trunk and activating a panic alarm and, in a training mode, for sending code signals to tire pressure sensors to tell the sensors what tire they are in, e.g., after wheel rotation, so that the sensors subsequently can transmit the proper location signals to the vehicle's ECM along with the pressure signals.

Abstract: A data transmission method for a tire-pressure monitoring system (10) of a vehicle. The data is transmitted by wheel units (12) to a central computer (13) located in the vehicle. The method comprises: a data transmission phase in parking mode, over a first period; and a data transmission phase in running mode, over a second period shorter than the first period. The method is characterized in that a natural time lag between various internal clocks with which each wheel unit (12) is equipped is used to prevent collisions between transmissions from the various wheel units of one and the same 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: A tire pressure monitoring system for monitoring pressure of tires mounted on a vehicle by comparing a detected tire pressure, detected by a pressure sensor installed at each of the tires, with a predetermined value to determine whether the detected tire pressure is proper. The system includes a first temperature sensor that detects internal temperature of the tire, a second temperature sensor that detects ambient temperature at a place where the vehicle locates, and the predetermined value is corrected based on a difference between the detected tire internal temperature and ambient temperature, when the tire pressure is to be adjusted. With this, even if the tire pressure is adjusted when the tire internal temperature is higher than the ambient temperature, the tire pressure can be prevented from falling below the proper pressure when the internal temperature falls to the ambient temperature.

Abstract: A low or no pressure use indicator for use on a tire is provided. The tire has a crown and a pair of sidewalls that extend from the crown. Each of the sidewalls has a bead located on an end of the sidewall that is opposite from the crown. The low or no pressure use indicator is located on a wall of one of the sidewalls. The low or no pressure use indicator is configured for indicating by a permanent physical change whether the tire has been subjected to an operation condition of an undesirable amount of low tire pressure.

Abstract: A tire pressure monitoring system (12) for a vehicle (10) has a plurality of tires (14a, b, c and d) in respective rolling locations and a spare tire (14e) generating a spare tire identification. A controller (22) starts the timer (44) and sets a tire status to a rolling status, a pending rolling status, a spare status or a pending spare status in response to the timer and the vehicle speed. The controller (22) stores the status and the spare tire identification in the memory.

Abstract: Disclosed is a device (10) and method for determining a temperature-corrected tire pressure. A preselected baseline temperature (26) is measured or selected. A second temperature (28) is measured using a temperature probe (22). An actual tire pressure (30) is measured (24). A programmed processor calculates and displays (14) a corrected tire pressure (32) corresponding to the baseline temperature (26) according the ideal gas law.

Abstract: The invention relates to a system for regulating the pressure in a tire comprising an outer casting (3) which is mounted on a rim (2). The tire comprises an inner casting (5) which is disposed at the bottom of the rim (2) and which can constitute a high-pressure air reserve, a first actuator (6) which is integrated in the inner casting (5) and which authorizes the flow of air to the outer casting (3) for inflation purposes, a second actuator (8) which is integrated in the outer casting (3) and which authorize the release of air to the outside for deflation purposes; an electronic assembly which can send information to one or other of the actuators (6, 8) and/or receive the information delivered by the detector(s) (7, 9) in order to control the pressure and the temperature in the outer casting (3) and/or in the inner casting (5), a mean for controlling said electronic assembly and a keyboard. The inventive system is suitable for vehicles.

Abstract: A method for monitoring an operating condition of a vehicular tire. The method includes providing magnetized areas in the tire and magnetic field sensors on the chassis of the vehicle. Rotation of the tire produces magnetic field pattern signatures which characterize the tire's materials, construction and deformation conditions. Changes in magnetic field pattern signatures from a baseline are indicative of impending abnormalities in tire integrity that can be recognized in advance to forestall vehicle accidents attributed to tire faults.

Abstract: A device for continuously measuring deformations in a tire mounted on a rim includes at least one emitter, at least one reflecting element, and at least one optical sensor of luminous intensity. The at least one emitter and the at least one optical sensor are disposed on the rim. The at least one reflecting element is disposed on a portion of an inner surface of the tire. The at least one emitter emits a light beam toward the at least one reflecting element, the at least one reflecting element reflects the light beam toward the at least one optical sensor, and the at least one optical sensor receives the reflected light beam, measures a prechosen physical parameter associated with the reflected light beam, and provides a signal representing a deformation of the tire on the portion of the inner surface of the tire.

Abstract: A vehicle wheel speed is calculated based on a vehicle wheel speed signal outputted from a vehicle wheel speed sensor and a change width w which is an amplitude of a time change component of the calculated vehicle wheel speed. When the calculated change width w is equal to or more than a reference value w0 it is judged that a quick tire deformation is currently generated and a driver of the vehicle is informed of the quick deformation by actuating a warning device.

Abstract: An external mount tire pressure sensor system with a stretch sensor having a variable resistance longitudinal displacement characteristic. The stretch sensor is coupled to a processor which samples the resistance of the stretch sensor periodically. The sensor body is attached to the external side wall of a pneumatic tire so that the body is displaced by the tire side wall and the resistance is a function of internal tire pressure. When the processor determines that the pressure is below a threshold value, an r.f. generator is activated by the processor to generate a low tire pressure signal. This signal is converted by a receiver to a warning for the driver.

Abstract: A system for monitoring deformations of a moving tire mounted on a rim associated with a vehicle includes a moving station and a fixed station. The moving station is operatively coupled to the rim. The moving station measures, at least intermittently and in at least one direction, a distance between the moving station and an inner surface of the tire. The fixed station is operatively coupled to the vehicle. The fixed station receives from the moving station, at least intermittently, at least one first signal associated with the measurement. The moving station measures the distance within a time interval when a first antenna associated with the moving station and a second antenna associated with the fixed station are in proximity to each other. Related methods for monitoring deformations of a moving tire mounted on a rim associated with a vehicle are also disclosed.

Abstract: Each transmitter transmits temperature/pressure data of an associated tire together with an ID assigned to each transmitter. A pneumatic tire pressure monitoring apparatus receives the temperature/pressure data, and inputs traveling condition specifying data which specifies traveling conditions of the vehicle. Then, the pneumatic tire pressure monitoring apparatus identifies IDs assigned to the transmitters of respective tires actually installed on vehicle wheels of its own vehicle based on the temperature/pressure data and the traveling condition specifying data, and registers the identified IDs into a memory of the pneumatic tire pressure monitoring apparatus.

Abstract: A tire pressure indicator includes a hollow annular pressure cell fixed fastened to the inner side of the rim for synchronous rotation, the hollow annular pressure cell having a diaphragm that displaces subject to the condition of the tire pressure of the tire, a contactless displacement sensor adapted to detect axial displacement of the diaphragm and to produce a corresponding modulated signal, a signal processor adapted to process the modulated signal from the displacement sensor into a tire pressure signal, a pressure display adapted to display the value of the tire pressure signal output from the signal processor, and a link tube connected between the hollow annular pressure cell and the tire to keep the internal air pressure of the hollow annular pressure cell in balance with the internal air pressure of the tire.

Abstract: A tire air pressure detection device includes an ideal driving status calculating portion (3e) and a rotational status value compensating portion (3f). The ideal driving status calculating portion calculates an ideal status value (?id) corresponding to a slip value under an ideal driving status without tire slippage. The rational status value compensating portion calculates and ideal rotational status value under the ideal driving status without tire slip based on the regression line calculated by a regression line calculating portion (3d) and the ideal slip status value calculated by the ideal driving status calculating portion.