A method for calibrating a radial acceleration sensor of a wheel of a vehicle including the following steps: acquisition, by the sensor, of signals S.sub.i, each signal S.sub.i being acquired during a predetermined time window W.sub.i when the vehicle is in motion, the windows W.sub.i being different from one another; detection, for each time window W.sub.i, of local extrema of the signal S.sub.i associated respectively with phase values and detection instants; determination, for each time window W.sub.i, of a frequency F.sub.i of the rotation of the wheel of the vehicle as a function of the phase values and of the detection instants for the local extrema detected; low-pass filtering of the signals S.sub.i, so as to obtain, for each time window W.sub.i, a filtered value Z.sub.i; calibration of a constant error E.sub.c of the radial acceleration sensor as a function of the filtered values Z.sub.i and of the frequencies F.sub.i.

A method of determining an orientation of a tire mounted device with respect to a wheel rim using an acceleration sensor. With the wheel in a designated orientation and not rotating, a polarity of acceleration along a vertical axis is determined. Then it is determined which of a first absolute orientation or a second absolute orientation the tire mounted device is in depending on the determined polarity. The determined absolute orientation is correlated with the designated orientation to determine which of a first or second orientation with respect to the wheel rim the tire mounted device is in.

A sensor transmitter calculates a tilt angle for attachment of a G sensor to a corresponding one of wheels and estimates whether the sensor transmitter itself is attached to a right wheel or a left wheel based on a calculation quadratic function, a calculation linear function, a measurement quadratic function, and a measurement linear function. Then, a receiver determines whether the sensor transmitter is attached to a front wheel or a rear wheel based on the result of the estimation and an effective tire radius. In this manner, it can be determined which one of the wheels the sensor transmitter is attached to.

A system includes detecting devices secured respectively on wheels of a vehicle at different angular positions, sensors assigned respectively to the wheels and a control unit. Each detecting device emits a detecting signal when disposed at a first position and a second position different from the first position by a first angle. The first position where each detecting device emits the detecting signal during a current rotation cycle of the respective wheel differs from that during a next rotation cycle of the respective wheel by a second angle. The control device analyzes the detecting signals and tooth number signals from the sensors to associate the detecting devices respectively with the sensors.

A tire condition monitoring system includes transmitters that are respectively attached to wheel assemblies of a vehicle. Each transmitter includes a power source, a data generating section, a storage section that stores a correspondence relationship in which ranges obtained by dividing possible values of the detection value of a traveling state detecting section are respectively assigned to a plurality of specific angles set for the rotation angles of the wheel assemblies, and a transmission control section capable of performing specific angle transmission in which the transmission control section transmits the transmission data from the transmitting section when detecting that the rotation angle of the wheel assembly is any of the specific angles. When performing the specific angle transmission, the transmission control section transmits the transmission data when detecting that the rotation angle is the specific angle that corresponds to the detection value of the traveling state detecting section.

A pneumatic tire comprises: a fastener disposed on a tire inner surface, the mechanical fastener being a first mechanical fastener of a separatable pair of mechanical fasteners composed of at least two fastener members; wherein a) the fastener members sandwich a rubber-coated fiber reinforced member and fix together; b) the fastener is disposed within a region such that the following relationship is satisfied: 0.05≤A/H≤0.4, where A is a height in a tire radial direction from a bead toe end to a center position (C) of the fastener, and H is a height of a cross section of the tire; and c) the fiber reinforced member includes fiber bundles disposed in alignment in at least one direction, and forms an angle (minor angle θ) with a tire circumferential direction such that: 30 degrees≤θ≤90 degrees.

A reception control section obtains the rotation angles of wheel assemblies when receiving transmission data by a reception circuit. The reception control section divides 360°, which is the range of the possible rotation angles of the wheel assembly, into equal parts to obtain angle ranges and assigns each of the obtained rotation angles to one of angle ranges. The reception control section derives the angle range in which the number of times (frequency) the obtained rotation angles are included is a maximum value. The reception control section calculates a reception-side angle difference, which is the difference between the median values of the angle ranges in which the number of times the obtained rotation angle is included is a maximum value. The reception control section associates the ID codes with the wheel assemblies based on the correspondence between the reception-side angle difference and the angle difference between specific angles.

An apparatus for determining a wheel condition on whether wheel locking occurs in each wheel of a vehicle having a main brake apparatus and an auxiliary brake apparatus. The apparatus includes: a WSS (Wheel Speed Sensor) configured to primarily detect whether wheel locking occurs; a TPMS (Tire Pressure Monitoring System) configured to secondarily detect whether wheel locking occurs; and a control unit configured to determine, when the WSS fails, a wheel condition indicative of whether wheel locking occurs in each wheel, by using information detected through the TPMS.

A wheel position detection apparatus applied to a vehicle including a vehicle body attached with multiple travelling wheels. The apparatus includes: multiple transmitters respectively disposed at travelling wheels; and a receiver disposed at the vehicle body. The transmitter includes: an acceleration sensor outputting a detection signal according to an acceleration including a gravitational acceleration component being varied by a rotation of the corresponding travelling wheel attached with the transmitter; and a first controller creating a frame including unique identification information, and transmit the frame in response to the receiver outputting a transmission command. The receiver includes a second controller executing a wheel position detection through: identifying, from each set of the unique identification information included in the frame, which of the travelling wheels is attached with the transmitter having transmitted the frame; and registering the travelling wheels in association with the unique identification information of the transmitter.

The present application provides a tire pressure positioning method and apparatus. The method includes: obtaining turning information used to indicate turning of a vehicle; obtaining a y-axis acceleration of a tire pressure sensor in a tire of the vehicle, where a y-axis is an axial direction parallel to a wheel bearing; and determining a position of the tire pressure sensor according to the turning information and the y-axis acceleration. Information about the y-axis acceleration of the tire pressure sensor is processed. Compared with a method in the prior art in which information about an x-axis acceleration and information about a z-axis acceleration need to be processed simultaneously, the method can reduce a data processing amount, thereby simplifying data collection and calculation processes and improving system operation efficiency.