Abstract: A method of allowing control of a vehicle with at least two-wheels in case of puncture of a tire, each wheel including a rim and a tire associated therewith, includes the steps of: inflating each tire to an operating pressure; admitting a fluid compressed to a first pressure higher than the operating pressure of the tire 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 a predetermined first threshold value; detecting a variation of an inner pressure of the tank; activating a pressure measuring device when the inner pressure variation corresponds to a reduction and is higher than a first predetermined value; measuring the inner pressure of the tank with a predetermined frequency by means of (through) the pressure measuring device; calculating a variation in the inner pressure in a time unit; generating an alarm signal when the calculated inner pressure variation corresponds to a reduction and is

Abstract: An on-line compensation apparatus for feedback positions of an encoder and method for operating the same are applied to a motor driven to rotate at a constant speed by a driver, thus compensating the errors of feedback positions of the encoder. First, a compensation quantity calculation unit is used to calculate the compensation quantity of feedback positions of the encoder. Afterward, a position interval judgment unit is used to determine the position interval of the compensation quantity. Finally, a compensation quantity modification unit is used to modify the compensation quantity by using different weightings. Therefore, the compensation quantity is modified by an iteration calculation to achieve that an error between the feedback position and an ideal position is in an acceptable region, thus increasing accuracy of the feedback position compensation of the encoder.

Abstract: Wireless transmission from sensor devices included in tires is coordinated by a receiving unit associated with the tire, or transmission coordinator. In more detail, every sensor device is made aware of an overall time window available for transmission, and based on at least this information, it calculates a dedicated timeslot for the transmission of its data within such time window. This coordinated transmission makes possible a strong reduction of the probability of collisions and transmission errors, and reduces the number of transmissions, so as to comply with the limited power resources available at each sensor device.

Abstract: An apparatus, method, and computer program product for monitoring a tire are provided. An apparatus comprises a laser system comprising a number of lasers configured to identify a radius of a tire of a vehicle located on a ground, wherein a laser in the number of lasers is associated with an axle of the tire. The apparatus also comprises a tire monitoring system configured to identify a set of acceptable radii for the tire using a weight of the vehicle and information about the tire, determine whether the radius of the tire is within the set of acceptable radii, and generate an indication that the radius of the tire is not within the set of acceptable radii comprising the radius of the tire responsive to an absence of a determination that the radius of the tire is within the set of acceptable radii.

Abstract: A method for detecting a decrease in tire air pressure based on wheel rotation speed information obtained from tires attached to a four-wheel vehicle.

Abstract: A method of indirect tire pressure monitoring for indicating when a pneumatic tire on a wheel at one end of a motor vehicle axle is underpressurized relative to a pneumatic tire on a wheel at an opposite end of the axle while the vehicle is being driven on a road surface. ABS wheel sensors are used as inputs to a devoted processor for indirect tire pressure monitoring.

Abstract: A vehicle system that can overcome at least some of the aforementioned shortcomings includes tire sensors mounted in, on or adjacent respective tires of the vehicle, LF antennas including a door-mounted antenna on a door of the vehicle, a receiver mounted on the vehicle, a door switch associated with the door having the door-mounted antenna mounted thereto, and an ECU in communication with the antennas, the receiver and the door switch. Each tire sensor is configured to transmit a signal and to detect an LF field. Each LF antenna is configured to transmit an LF tire sensor wake up field to wake up respective tire sensors. The receiver is configured to receive signals transmitted from the tire sensors. The door switch is configured for determining whether the door is open. The ECU is configured to receive identification signals from the respective tire sensors via the RF receiver.

Abstract: A method for detecting the state of a vehicle tire and/or a roadway, in which at least one sensor, in particular an acceleration sensor, disposed in the tire interior generates a signal that is assigned to physical variables of the vehicle tire and/or the roadway. A tire state and/or characteristics of the roadway are/is determined on the basis of the signal.

Abstract: A detection-alarm mechanism is provided. The detection-alarm mechanism for a tire includes a sensor, an electronic processing unit, a post-processing unit and a display unit. The sensor includes a substrate disposed in the tire and at least one photoelectronic element fixed to the substrate. If the tire is cracked, light passes through the cracks and reaches the photoelectronic elements to generate signals. The electronic processing unit receives signals from the photoelectronic elements to generate wear information. The post-processing unit is disposed in a vehicle on which the tire is installed and receives wear information from the electronic processing unit. The display unit is disposed in the vehicle for presenting the wear information.

Abstract: A mobile terminal including an input device using a piezoelectric sensor and a method of operating the mobile terminal are provided. The mobile terminal includes: a body; and a piezoelectric sensor unit including a first piezoelectric sensor positioned at a first side surface of the body and to which at least one function key for performing a first specific function corresponding to a user function of the mobile terminal is set and a second piezoelectric sensor positioned at a second side surface of the body and to which at least one function key for performing a second specific function different to the first specific function is set.

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: A sensor location identification system may include a plurality of front and rear sensors, a transmitter, and a receiver module. The plurality of front sensors may be connected to a plurality of front tires and may generate first wireless signals indicative of a rotational direction of a corresponding one of said plurality of front tires. The plurality of rear sensors may be connected to a plurality of rear tires and may generate second wireless signals indicative of a rotational direction of a corresponding one of the plurality of rear tires. The transmitter may transmit a location signal received by the plurality of rear sensors. The receiver module may receive the first and second wireless signals and may determine a location of each of the plurality of front and rear tires based on the first and second wireless signals. The second wireless signals may indicate receipt of the location signal.

Abstract: A vehicle presence notification apparatus generates a notice sound by emitting an ultrasonic wave in mid air based on an ultrasonic signal modulated according to an audible sound. During proceeding in mid air, the modulated ultrasonic wave is self-demodulating to become an audible sound. The audible sound posterior to the self-demodulation has a significant directionality like the ultrasonic wave. The notice sound is thus conveyed mainly to a pedestrian who is present in a dangerous area range where a danger needs to be taught. In addition, the vehicle presence notification apparatus includes a sensor-use ultrasonic transducer device having a transducers. The transducer device serves as a vehicle velocity sensor by transmitting an ultrasonic wave towards a road surface based on an ultrasonic wave signal or modulated ultrasonic wave, thereby enabling the vehicle presence notification apparatus to acquire vehicle velocity information by itself.

Abstract: An apparatus for detecting a tire having a decreased pressure based on resonance frequency of tires attached to respective wheels of a vehicle. The apparatus includes a storage means for storing information regarding a distribution of resonance frequencies respectively corresponding to a plurality of air pressure statuses, an initialization means for estimating a frequency characteristic of the rotation speed information or the rotation acceleration information, a frequency estimation means for estimating a frequency characteristic of the rotation speed information or the rotation acceleration information of a running vehicle, and a Bayesian estimation means for subjecting a tire pressure status at a certain time to a Bayesian estimation based on the resonance frequency during the initialization, a resonance frequency at the certain time obtained from the frequency estimation means, and distribution-related information stored in the storage means.

Abstract: A piezoelectric triggering mechanism (10) includes a piezoelectric element (12), such as the transducer of a SAW device, that is configured to crack or break upon being subjected to excessive levels of mechanical force or other triggering mechanisms, thus generating a burst of electromagnetic energy. The large impulse of energy can then be conditioned (14) through resonant circuits or antennas and modulated (16) with an identification pattern through appropriate structures (such as SAW electrodes) to send a breakage indication signal to a remote receiver (18). Piezoelectric elements (12) may be integrated with a pneumatic tire structure to provide indication upon pressure loss or tire failure. Piezoelectric elements (12) may also be integrated with safety support features of some tire structures to provide indication of tire operation in a run-flat mode of operation.

Abstract: Disclosed is a method for detection of a pressure loss in motor vehicle tires, which detects pressure loss on at least one vehicle tire based on several parameters, which are calculated from the rolling circumference of the tires. To this end, currently calculated parameters are compared with learnt values of the parameters.

Abstract: A method of detecting a low tire pressure condition on a machine is disclosed. The method may include determining at least one of an actual pitch of the machine and an actual roll of the machine, at a known location and determining at least one of an expected pitch of the machine at the known location and an expected roll of the machine at the known location. The method may further include comparing at least one of the actual pitch to the expected pitch of the machine and the actual roll to the expected roll of the machine. The method may also include outputting a signal indicative of the low tire pressure condition of at least one tire, if at least one of the actual pitch and the actual roll deviate from the expected pitch and the expected roll of the machine, respectively.

Abstract: A measurement system scans the given surface of a tire component (e.g., a brush-finished tread or buffed tire casing) to electronically measure data points corresponding to vertical and horizontal coordinates along the given surface. Associated computer processors electronically calculate the slope at a plurality of different locations by determining the degree of steepness (e.g., rise over run, angle or grade) between selected ones of the first and second coordinates and electronically comparing at least one slope-based parameter to one or more predetermined levels to determine a characterization defining one or more of surface adhesion fitness, finishing brush wear level and brush bristle placement location. Slope may be determined between every adjacent pair of data points or between selected data points (e.g., identified local maximum and minimum). The at least one-slope based parameter compared to the predetermined levels may correspond to the slopes themselves or to a calculated average slope value.

Abstract: An apparatus, method, and computer program product for monitoring a tire are provided. An apparatus comprises a laser system comprising a number of lasers configured to identify a radius of a tire of a vehicle located on a ground, wherein a laser in the number of lasers is associated with an axle of the tire. The apparatus also comprises a tire monitoring system configured to identify a set of acceptable radii for the tire using a weight of the vehicle and information about the tire, determine whether the radius of the tire is within the set of acceptable radii, and generate an indication that the radius of the tire is not within the set of acceptable radii comprising the radius of the tire responsive to an absence of a determination that the radius of the tire is within the set of acceptable radii.

Abstract: A transceiver includes a receiver, a signal strength determiner, and a controller. The receiver receives a trigger signal transmitted by a triggering device; the trigger signal indicates both a signal strength range and a command. The signal strength determiner determines the strength of the trigger signal received by the receiver. The controller is configured to: 1) determine whether the strength of the trigger signal determined by the signal strength determiner is within the signal strength range indicated by the trigger signal; 2) and perform a task in accordance with the command indicated by the trigger signal only when the strength of the trigger signal is within the signal strength range.

Abstract: An apparatus for detecting a decreased air pressure of a tire includes an acceleration calculation circuit for calculating, based on rotation velocity information of tires of respective wheels of a vehicle; an acceleration variation calculation circuit for calculating acceleration variations of the respective tires; a comparison circuit for comparing the acceleration variations of the respective tires; an estimation component for estimating, when a comparison result of the comparison shows that an acceleration variation of a certain tire is greater than acceleration variations of the other tires, a decrease in air pressure of the certain tire; a test circuit for determining a tire having a rotation velocity that is faster than the rotation velocities of the other tires or that is further slower than a predetermined reference; and a judgment circuit for judging, when a certain tire identified by the estimation is identical with the tire identified by the test, a decrease in air pressure of the certain tire.

Abstract: A tire pressure detecting apparatus has a micro-controller, a detecting module and a transceiver. The detecting module is electronically connected to the micro-controller and has a tire pressure detecting unit controlled by the micro-controller to detect a tire pressure inside a tire. The transceiver is electronically connected to the micro-controller, transmits a high frequency signal corresponding to detected characteristic tire parameters from the detecting module to a monitoring system inside a car and receives an external high frequency signal sent from external tire pressure detecting apparatus for the micro-controller, with the micro-controller temporarily delaying sending of the high frequency signal until a waiting time has expired to prevent signal collision between the high frequency signal and the external high frequency signal.

Abstract: A method of detecting the motion of a vehicle (13) of which at least one wheel unit (11) of said vehicle is equipped with a motion detection element (D) that generates a motion signal (20) when the vehicle is in motion, including: establishing (19) a collection of characteristics of parasitic signals (Sp) stored in the wheel unit; comparing each motion signal (20) from the wheel unit (11) against the collection (19) of parasitic signals (Sp) stored in memory; and sending to a vehicle central processing unit (17) only those wheel unit signals (16) that are not present in the collection of parasitic signals.

Abstract: An object is to provide a method capable of reducing calculation number of times for obtaining a primary regression line of a slip ratio and acceleration, and detecting a decrease in internal pressure of tires with high accuracy even in the case where is no evenness in a road surface.

Abstract: There is provided a vehicle abnormality detection method detecting an abnormal state in which a high temperature occurs due to maladjustment of a vehicle bearing mechanism section or vehicle brake mechanism section, and a device thereof and a sensor unit thereof. By use of the sensor unit 100 mounted in a rim 31, an air temperature within a tire 2 is sensed as a first temperature and a temperature (second temperature) of the rim 31 is sensed as a temperature related to at least one of a temperature of the vehicle bearing mechanism section and a temperature of the vehicle brake mechanism section 40. Then a temperature difference between the first and second temperatures is calculated and when the temperature difference is a predetermined value or more, it is determined that an abnormality has occurred in the vehicle bearing mechanism section or vehicle brake mechanism section 40. The abnormality is thus detected.

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: A tire wear detection device includes a wear detector embedded in a tread of a tire, a sensor unit arranged on a wheel, and a receiver unit arranged on a vehicle body. The wear detector includes a piezoelectric element and a resonance circuit, which generates a radio wave signal from a voltage signal generated by the piezoelectric element. The sensor unit transmits through wireless communication a pressure data signal indicating an internal air pressure of the tire, generates a wear data signal indicating a wear state of the tire based on the received radio wave signal, and transmits through wireless communication the wear data signal. The receiver unit receives the pressure data signal and the wear data signal from the sensor unit.

Abstract: A method for monitoring a tire during running includes acquiring and storing, at least temporarily, a first curve representing an acceleration profile of a first point of a tread area of the tire; acquiring and storing, at least temporarily, at least one second curve representing an acceleration profile of a second point of the tread area; and comparing the first curve and the at least one second curve, or parameters derived from the first curve and the at least one second curve, so as to determine a dynamic behavior of the tire. The first and second points are located substantially on a same meridian plane of the tire. A related tire, wheel for a vehicle, system for monitoring a tire during running, and method for controlling a vehicle are also disclosed.

Abstract: A transmitter unit has a housing adapted to be coupled in association with a trailing vehicle. The housing also has a multiple axis accelerometer adapted to sense the status of the transmitter unit and a trailing vehicle. The housing also has electronic components coupled with the accelerometer. A receiver unit has a housing adapted to be coupled in association with a leading vehicle. A user in audio proximity to the receiver unit is wirelessly signaled in the event of an anomaly at the transmitter unit.

Abstract: A tire-pressure control apparatus includes time calculation means for calculating an up time over which the tire pressure of each wheel increases from a lower limit set value to an upper limit set value and a down time over which the tire pressure of the wheel decreases from the upper limit set value to the lower limit set value, on the basis of the detection value of a corresponding pressure sensor; average-rotational-speed calculation means for calculating an average rotational speed of the wheel during the up time on the basis of the detection value of a corresponding wheel speed sensor; first-pump-supplied-air-quantity calculation means (403) for calculating a first pump-supplied air quantity Qvw* of a corresponding air pressure generation unit in a single generation and non-generation cycle on the basis of the up time and the average rotational speed; second-pump-supplied-air-quantity calculation means (404) for calculating a second pump-supplied air quantity Qp* of the air pressure generation unit in a

Abstract: A method of indirect tire pressure monitoring for indicating when a pneumatic tire on a wheel at one end of a motor vehicle axle is underpressurized relative to a pneumatic tire on a wheel at an opposite end of the axle while the vehicle is being driven on a road surface. ABS wheel sensors are used as inputs to a devoted processor for indirect tire pressure monitoring.

Abstract: A system for automatically recognizing the locations of respective tires includes tire sensors, startup antennas, and a control unit. Locations of the respective tire sensors can be recognized based information of which antenna is involved and whether signals transmitted are identical. With this system, the locations of respective tires of a vehicle can be recognized in a simpler and more efficient way.

Abstract: A system for and a method of controlling the stability of a vehicle includes an electronic control system controlling a vehicle stability control subsystem based at least in part on static tire data received by the electronic control unit.

Abstract: Transceiver ID information associated with a subject vehicle is accurately registered even when another vehicle having transceivers is nearby. During ID registration, a degree of a variance among received strength data elements is obtained in relation to a plurality of transceivers each having ID information associated therewith. ID information associated with data elements having a small degree of a variance is recognized as ID information of a transceiver attached to the subject vehicle. Therefore, ID information associated with transceivers attached to the subject vehicle can be reliably discriminated from ID information associated with transceivers attached to another vehicle.

Abstract: The invention relates to a monitoring system for vehicle wheels and a wireless measurement module. The wireless measurement module is configured to be attached to a vehicle wheel and comprises: an acceleration measurement unit for determining acceleration information associated with wheel motion of the vehicle; a state determination unit for determining a value of at least one parameter characterizing a characteristic or state of the vehicle wheel by using the acceleration information; and a module communication unit for communicating the value of said at least one parameter by means of a wireless communication signal.

Abstract: The procedure and the facility are used for wireless transmission between a wheel module (9) arranged in a tire (2) and an external control device (3). A first transmission signal is transmitted from an antenna (6) of the control device (3) to an antenna (11) of the wheel module (9). Data is transmitted via a second transmission signal from the wheel module (9) to the control device (3), whereby the first transmission signal has a different frequency from the second transmission signal. The first transmission signal is received by the antenna (11) of the wheel module (9) during a coupling period, within which while the tires (2) are rotating, an area of influence (15) of the antenna (11) of the wheel module (9) which also rotates, and a stationary area of influence (14) of the antenna (6) of the control device (3) overlap. After the beginning of the coupling period is recognised, the data transmission is started from the wheel module (9) to the control device (3).

Abstract: A vehicle monitoring system which may easily identify information transmitted from each of detecting devices without registration of identification information of the detecting devices and a transponder thereof are provided. A display is disposed in a distal end of the transponders all connected in series through a cable. Each of the detecting devices detects conditions in a predetermined portion of a vehicle and transmits vehicle information including measurement results, its own identification information and the number of transmissions. Each of the transponders determines whether the vehicle information transmitted from the detecting devices is received or not based on the identification information of the detecting devices registered in advance, and transmits the vehicle information to the transponder connected to the transmitting side or the display, when it determines that the vehicle information is to be received.

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 tire pressure monitoring device and system includes a support or housing mounted to a rim of a wheel of a vehicle. A casing is movably secured to the support and a pair of spaced magnets are disposed within the casing. The casing is collapsible for varying the length of the casing in response to changes in the tire pressure to move the magnets relative to each other. A sensor is mounted a distance from the casing for sensing a presence of each of the magnets. A controller is in communication with the sensor to determine the length of the casing and the relative movement between the magnets to calculate any changes in tire pressure.

Abstract: An apparatus for detecting a tire having a decreased pressure based on resonance frequency of tires attached to respective wheels of a vehicle. The apparatus includes a storage means for storing information regarding a distribution of resonance frequencies respectively corresponding to a plurality of air pressure statuses, an initialization means for estimating a frequency characteristic of the rotation speed information or the rotation acceleration information, a frequency estimation means for estimating a frequency characteristic of the rotation speed information or the rotation acceleration information of a running vehicle, and a Bayesian estimation means for subjecting a tire pressure status at a certain time to a Bayesian estimation based on the resonance frequency during the initialization, a resonance frequency at the certain time obtained from the frequency estimation means, and distribution-related information stored in the storage means.

Abstract: A tire management system includes a sensor module secured to inside of a tire that is mounted on a vehicle, for measuring a tire state value and transmitting the measured data to the vehicle side, and a receiver module secured to the vehicle side for transmitting a signal demanding the measured data to the sensor module at a predetermined cycle and receiving the measured data transmitted from the sensor module. The sensor module measures a tire status value at a predetermined cycle, judges whether the measured data is out of a predetermined normal range, and immediately transmits the measured data and an abnormal state data through a predetermined channel exclusively used for transmitting the abnormal state data to the receiver module, if the data is judged to be out of the normal range. With this structure, if an abnormal state occurs, the receiver module can receive the abnormality without any delay, while preventing shortening of the cell life.

Abstract: A sensor system has a least one voltage generator for conversion of non-electrical energy to electrical energy. At least one energy store is connected downstream from the voltage generator. At least one voltage converter is connected to the energy store such that its output signal is suitable for operation of a processor controller. At least one sensor is provided, and at least one transmitter enables wire-free transmission of transmission messages produced by the processor controller and containing at least one measured value from the at least one sensor. A timer circuit is triggered as a function of a voltage level of the at least one energy store, and activates the sensor system to transmit at least one transmission message after a specific time interval.

Abstract: A collision detection apparatus for a vehicle having a vehicle bumper, which includes a bumper reinforcement includes a chamber member, a pressure sensor, and a collision detecting device. The chamber member is provided inside the vehicle bumper at a front surface of the bumper reinforcement. The pressure sensor is configured to sense change of pressure in the chamber space. The chamber member includes a deformable part and a non-deformable part, each of which extends in a vehicle width direction. The deformable part is compressed to be deformed between the collision object and the bumper reinforcement in a case, where the collision object collides with the vehicle bumper. The non-deformable part is limited from being compressed to be deformed.

Abstract: The present invention provides an apparatus, method and program for detecting abnormality in tire air-pressure which allow detecting abnormality in tire air-pressure even if pressure in a tire is completely zero. The apparatus for alarming abnormality in tire air-pressure includes means of (1) calculating the acceleration variations of respective tires from accelerations of the tires calculated by rotational wheel velocities; (2) comparing the calculated acceleration variations of the respective tires; and (3) detecting air-pressure in a tire is abnormal when the acceleration variation of the tire is larger than the acceleration variations of the remaining tires as a result of comparison.

Abstract: The present invention includes a sensor malfunction determination unit 207 detects the pressure value corresponding to a signal outputted by a pressure sensor 101 capable of measuring the internal pressure of a pneumatic tire 10. When the detected pressure value is decreasing along the time axis, the sensor malfunction determination unit 207 determines that the pressure sensor 101 is not malfunctioning.

Abstract: A tire inflation pressure detecting apparatus includes a second transceiver provided on the body of a vehicle which changes its operation alternately between a second transmitter and a second receiver mode, thereby intermittently transmitting a radio wave. A first transceiver provided on a wheel of the vehicle operates in a first receiver mode to receive the radio wave, thereby charging a charging unit. When the charging unit has been sufficiently charged, the first transceiver changes operation thereof from the first receiver mode to a first transmitter mode, in which the first transceiver first repeatedly transmits an informing signal at predetermined time intervals for a predetermined time period and then transmits a pressure signal. When the informing signal is received by the second transceiver in the second receiver mode, the second transceiver keeps its operation in the second receiver mode until the pressure signal is completely received.

Abstract: A process for monitoring a tire (11 to 14) mounted on a land vehicle (VH), the process being implemented by means of a central control unit (UC) and an electronic chip (21g to 24g) implanted in a sidewall of the tire. A tire is provided with two chips (21g to 24g, 21d to 24d) implanted in its respective sidewalls, but only one of them is operational during use depending on the mounting direction of the tire. The chips of the same tire contain a given tire identification code (K11 to K14) and specific respective codes (Kg, Kd) that indicate their implantation in the tire. The process is implemented by compiling and/or updating, both in the central unit (UC) and in the operational chip (21g, 22d, 23g, 24d), historical records of the use of the tire by memorising updated values of evolutive parameters of the use of the tire, such as the number of kilometers (DIST) it has covered or its highest running speed (VMAX).

Abstract: An apparatus for detecting a decrease in a tire air pressure includes; a rotation velocity information detection means for regularly detecting tire rotation velocity information regarding the respective wheels of a vehicle; a resonance frequency estimation means for estimating a resonance frequency of the rotation velocity information based on the rotation velocity information obtained by the rotation velocity information detection means; and a determination means for determining, based on the estimated resonance frequency, a decrease in the tire air pressure. The apparatus includes a data rejecting means for rejecting data of rotation velocity information hindering the estimation of the resonance frequency.

Abstract: The invention includes: a rotation velocity information detection means for regularly detecting tire rotation velocity information regarding the respective wheels of a vehicle; a frequency characteristic estimation means for estimating a frequency characteristic of the rotation velocity information based on the rotation velocity information obtained from the rotation velocity information detection means; and a determination means for determining a decrease in the air pressure of the tire based on the estimated frequency characteristic. The frequency characteristic estimation means is configured to extract a resonance peak of the rotation velocity information by calculating a gain corresponding to an arbitrary frequency.

Abstract: A tire pressure sensing device for a tow trailer that signals the driver of the tow vehicle subsequent to deflation of at least one tire mounted to the trailer. The tire pressure sensing device further includes a base plate mounted to the axle of the tow trailer releasably secured by a generally u-shaped clamp. A switch is superposed on the base plate. The switch further includes an actuating rod support member and an actuating rod extending in a downward direction. The actuating rod biases the switch to a closed position subsequent to deflation of the tire thereby electrically activating a warning indicator.