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 sensing system for a vehicle includes wheel end sensors (WES), each WES proximate to at least one predetermined tire and configured to sense angular data, including at least one of angular position, angular velocity, angular acceleration, and/or angular displacement. The system includes a plurality of tire pressure monitoring (TPM) sensors, each TPM sensor inside one of the tires and configured to sense pressure, temperature, and angular data within said tire. The sensing system is configured to compare the angular data sensed by each WES to the angular data sensed by each TPM sensor to automatically identify, for each TPM sensor, a corresponding WES, and based on the position on the vehicle of the predetermined tire of the corresponding WES, identify the position on the vehicle corresponding to said TPM sensor.

A wheel position detection apparatus is applicable to a vehicle in which four wheels provided with tires are attached to a vehicle body, and is provided with sensor transmitters and a receiver. The sensor transmitters each include an acceleration sensor and a first control portion that detects the position of the corresponding wheel on the basis of the acceleration thereof, and creates and transmits a frame in which data indicating the result of the wheel position detection are stored. The receiver is provided in the vehicle body, and includes: a receiving portion that receives each transmitted frame by means of a receiving antenna; and a second control portion that identifies whether the sensor transmitter that has transmitted each frame is attached to the right wheels or the left wheels, from among the four wheels.

A method for pairing a measurement module with a wheel of a motor vehicle. The wheel revolution frequency value and the total number of acquisitions are sent with the emission angle value to the computer that stored a current angular position for at least one wheel and a series of angular positions. The computer selects angular positions sampled from a series of angular positions up to a total number of acquisitions, then filters the wheel revolution frequency, which filtering is similar to the filtering performed in the measurement module in order to obtain a sampled and filtered angular position and is then compared with the angular position with, for a difference of less than an experimentally predetermined percentage, a validation of the phase shift between the emission angles of the signals of the measurement module and the angular positions.

A wheel registration apparatus applied to a vehicle comprises: a transmitter that is provided on each of the four traveling wheels provided with tires and has a first controller configured to create and transmit a frame including unique identification information; and a receiver that is provided on a vehicle body, receives the frames transmitted by the transmitters provided on the four traveling wheels via a reception antenna in a registration mode, and has a second controller configured to register four pieces of the identification information included in the respective frames as pieces of identification information of the transmitters provided on current four traveling wheels.

A tire pressure monitoring device can include: a magnetic sensor configured to measure a first magnetic field intensity in a first direction, and to measure second magnetic field intensity in a second direction; and a controller configured to control a state of the tire pressure monitoring device based on a variation of the first magnetic field intensity and a variation of the second magnetic field intensity.

A method for operating an electronic wheel unit disposed on a vehicle wheel of a vehicle includes providing the electronic wheel unit with a detecting device for detecting rotation angle positions of the vehicle wheel that are present at certain detection times, and a radio transmitter device for transmitting a sequence of individual electromagnetic signals which include data representative of the detected rotation angle positions and their associated detection times. The detecting device is further used to detect an amount of a wheel acceleration of the vehicle wheel and to set an interval of time between the detection times of the rotation angle positions to be shorter the greater the amount of wheel acceleration. A corresponding electronic wheel unit and a method and an apparatus for localizing respective installation positions of a plurality of such electronic wheel units on a vehicle are also provided.

A method of measuring and transmitting a tire characteristic using a sensor device mounted to a tire of a wheel, the sensor device comprising a sensor element, an accelerometer, a wireless transmitter, and a microprocessor; the method comprising the steps of: a) obtaining acceleration data; b) digitally filtering the acceleration data; c) determining moments in time when the wheel is in an angular position range; d) obtaining other sensor data; e) transmitting the other sensor data at said moments in time, step b) comprising using exponential moving average filters connected in series, corresponding to a predefined set of formulas comprising parameters, and f) determining number of samples per 360 rotation, and setting the parameters to a value proportional to said number of samples. A sensor device adapted for performing said method.

A road surface state determination device includes a tire-side device and a vehicle-body-side system. The tire-side device is attached to each of a plurality of tires included in a vehicle. The vehicle-body-side system is included in a body of the vehicle. The tire-side device may output a detection signal corresponding to a magnitude of vibration of the tire. The tire-side device may sense the detection signal and generate road surface data indicative of a road surface state appearing in a waveform of the detection signal. The tire-side device may transmit the road surface data. The vehicle-body-side system may perform bidirectional communication with the tire-side device and receive the road surface data. The vehicle-body-side system may determine the road surface state of a road surface on which the vehicle is traveling based on the road surface data.

A vehicle body side system is provided with a second data communication unit that performs bidirectional communication with a tire side device and receives road surface data and measurement data transmitted from a first data communication unit, a road surface determination unit that determines the road surface condition of a road surface on which a vehicle travels based on the road surface data, a reception strength measurement unit that measures the reception strength of the measurement data, and a transmission angle setting unit that stores the reception strength of the measurement data during one rotation of a tire, sets as a transmission angle, a presence angle when the reception strength of the measurement data during one rotation of the tire is high, and transmits data indicating the transmission angle to the tire side device via the second data communication unit. In addition, a control unit causes the first data communication unit to transmit the road surface data when the presence angle becomes the transmission angle.