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.

Embodiments may provide a system, a wheel localizer, a wheel localization device, or methods for locating a position of at least one wheel out of a plurality of wheels of a vehicle. In one embodiment, a system comprises a detector that obtains information related to a reference magnetic field in which the at least one wheel rotates, an antilock braking system (ABS) unit that obtains information related to angular rotations of the plurality of wheels, and a locator that determines the position of the at least one wheel based, at least in part, on the information related to the reference magnetic field and the information related to the angular rotations of plurality of wheels, where the position comprises a wheel location from among the plurality of wheels. The reference magnetic field may be the earth's magnetic field.

Examples provide a method, a component, a tire-mounted TPMS module, a TPMS system and a machine readable storage or computer program for determining time information of at least one contact patch event of a rolling tire and a method for locating a tire. A method for determining time information of at least one contact patch event of a rolling tire, comprises obtaining information indicative of a rotational rate of the tire; obtaining a sequence of samples indicative of at least an acceleration component during at least one rotation of the tire; and determining a position of at least one reference sample in the sequence, wherein the position of the at least one reference sample is indicative of the time information of the contact patch event of the rolling tire.

Examples provide a method, a component, a tire-mounted TPMS module, a TPMS system and a machine readable storage or computer program for determining a duration of at least one contact patch event of a rolling tire. A method for determining a duration of at least one contact patch event of a rolling tire, comprises obtaining a sequence of acceleration measurement samples of the rolling tire from a tire-mounted acceleration sensor; and determining the duration of the contact patch event based on acceleration measurement samples of the sequence between a first time instance when the acceleration measurement samples cross a first threshold and a second time instance when the acceleration measurement samples cross a second threshold.

The invention relates to a method for self-tracking of a data acquisition sensor equipping a wheel including a tire on a vehicle comprising a plurality of wheels (200) and being equipped with a system comprising an electronic unit (300) for a data acquisition sensor placed in each tire equipped with a radio-frequency transmitter for the purpose of the wireless transmission of said data to a central transmission and reception module (100) placed on the axle or frame of the vehicle, with the central transmission and reception module (100) receiving and decoding the information signals issued by the transmitters of each wheel, each electronic unit (300) being equipped to measure acceleration. The method is remarkable in that it consists of determining the front and rear of a tire by measuring the acceleration.

A wheel position detecting device can suppress an erroneous detection of a wheel position even if a moving direction of a vehicle cannot be determined by wheel speed sensors whether in a forward direction or in a rearward direction. When an edge number (or a tooth number) is incremented based on detection signals of the wheel speed sensors of one, two or three wheels while the vehicle is at a halt, the edge number (or the tooth number) is not used as learning data. Thus, it is less likely that the wheel position is erroneously detected based on erroneous learning data. Therefore, even if the moving direction of the vehicle cannot be determined whether in the forward direction or the rearward direction by the wheel speed sensors, the wheel position detecting device can suppress the erroneous wheel position detection.

A method for determining a vehicle wheel's radial acceleration for a tyre pressure monitoring system, having a central electronic unit. The wheels each including a wheel unit attached to a rim or to a valve or the tyre tread's inner face, and including at least one radial acceleration sensor at a distance from the wheel's rotational axis, to measure the wheel's radial acceleration when it is not saturated, and a microprocessor, including: when the radial acceleration sensor is not saturated, measuring the radial acceleration of the wheel using the radial acceleration sensor; determining the wheel's rotation period; deducing, from the radial acceleration and the period, the distance of the wheel unit; storing the distance in the wheel unit's memory; and when the radial acceleration sensor is saturated, determining the wheel's rotation period, and calculating the radial acceleration from the rotation period and the stored distance.

A reception control section obtains a rotation angle of each wheel assembly when a reception circuit receives transmission data. The reception control section calculates the absolute value of the difference between the obtained rotation angle and a previously obtained rotation angle. The reception control section determines whether the absolute value of the difference is included in a reference range or a specific range. The reference range includes 0. The specific range includes the angle difference between specific angles.

Each of transmitters attached to respective wheel assemblies transmits transmission data when the wheel assembly reaches any of specific angles set at equal angular intervals. A receiver mounted in the vehicle obtains the rotation angles of the wheel assemblies from a rotation angle detecting section upon reception of the transmission data and obtains specific rotation angles by correcting the obtained rotation angles by using the value of the angle difference between the specific angles. The specific rotation angles are values that can be regarded as rotation angles that are obtained upon reception of the transmission data transmitted at the same specific angle. The receiver identifies the correspondence between ID codes included in the transmission data and the wheel assemblies by using the specific rotation angles.

A wheel position detection device includes: a transmitter in each wheel of a vehicle having a first control unit for transmitting a frame with ID and an acceleration sensor; and a receiver on a vehicle body, including a second control unit for registering the ID in association with the wheel. The first control unit detects a wheel speed, and stores data of the acceleration sensor in the frame. The second control unit includes: a first determination device that determines a condition that the acceleration sensor is not in an on-state; a candidate registration device that registers a candidate of the ID of a spare wheel when the condition is satisfied; a second determination device that determines a travel history of the vehicle; and a registration device that identifies the ID of the spare wheel when the travel history is present, and registers the ID in association with the spare wheel.