The present application relates to the technical field of automobile wheel positioning, and more particularly to a wheel positioning method, a system and an electronic control unit and a tire pressure sensor. The system comprises an electronic control unit, a tire pressure sensor and an ABS sensor. Embodiments of the present application provide the wheel positioning method, the system, the electronic control unit, and the tire pressure sensors to improve the accuracy of wheel positioning.

A tire position determination system is provided with: a plurality of tire air pressure transmitters each capable of transmitting a first radio signal including air pressure data and a tire ID; a plurality of axle rotation detection units each generating axle rotation information; and a receiver mounted to a vehicle body and capable of receiving the first radio signal. Each of the plurality of tire air pressure transmitters includes a specific position detection unit capable of detecting the arrival of the tire air pressure transmitter at a specific position on a trajectory of rotation of the tire, and a transmission control unit that, based on a result of detection, generates a second radio signal including data indicating the arrival of the tire air pressure transmitter at the specific position on the trajectory of rotation of the tire and the ID. The receiver includes a position determination unit that determines a tire position of the plurality of tires based on the second radio signal.

Provided is a tire air pressure transmission device configured to determine the rotational position of the tire air pressure transmission device based on a gravitational acceleration component of a centrifugal acceleration at the time of transmission of the tire air pressure information and to transmit in a wireless signal and at a prescribed cycle, tire air pressure information and tire air pressure transmission device rotational position information.

A method for pairing a measurement module with a wheel of a vehicle including, for each angular orientation signal associated with a specific wheel received by a computer, the steps of transmitting, by the computer, a measurement signal or a request to transmit a measurement signal to each module, measuring, by the computer or each module, a value of at least one parameter differentiating the signal, performing repetitions of the transmissions of measurement signals for each angular orientation signal received by the computer and storing values of the parameter, pairing a specific wheel with a measurement module when the values are substantially constant with a variation of less than 10% for the values, each wheel being associated with a module at the end of the method.

A wheel position detector for a vehicle includes: a transmitter at each wheel having a first control portion for generating and transmitting a frame with specific identification information; and a receiver at a vehicle body receiving the frame from one wheel and having a second control portion for performing wheel position detection; and a wheel speed sensor for detecting a tooth of a gear. The second control portion: acquires gear information indicating a tooth position; corrects the tooth position based on a time difference between acquiring of the gear information and receiving time of the frame; and specifies the one wheel based on the tooth position at reception time.

A pulse count part acquires the minimum value among the numbers of pulse signals outputted by respective wheel-speed sensors during a wheel speed is within a minute low speed range. The pulse count part sets said minimum value as the numbers of the pulse signals of respective wheel-speed sensors during the wheel speed is within the minute low speed range, when the wheel speed increases out of said minute low speed range. Thereby, even when a vehicle stops in the middle of a wheel location discrimination treatment, a wheel location discrimination treatment can be continued using a proper pulse count value.

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 via which tire modules can be associated with tire positions on a vehicle includes: inputting vehicle data and tire information via a mobile detecting device; analyzing the input information via the detecting device; providing an instruction to the user of the detecting device indicating the first tire for performing a first tire module identification; positioning the detecting device near the first tire which is specified by the detecting device; activating an inquiry signal having a transmission frequency specified by the detecting device and a specified signal amplitude to a tire module arranged in the tire, wherein the tire module includes at least one sensor for tire-pressure monitoring; capturing a response signal from the tire module, wherein the response includes the identification data of the tire module; and, evaluating the response signal of the tire module and associating the identified tire module with a tire position.

A wheel assembly rotational position identifying apparatus includes an acceleration detector, a control section, and a battery. The control section identifies the rotational position of the wheel assembly based on an acceleration detected by the acceleration detector. The control section operates in a control mode that is a selected one of a normal mode and a power saving mode, in which a power consumption associated with identification of the rotational position of the wheel assembly is smaller than that in the normal mode. The control section switches the control mode to the normal mode when an initiation condition is met in accordance with an input from outside. The control section also switches the control mode to the power saving mode when a termination condition is met in the normal mode.

A method for monitoring a tire condition includes the following steps: sense a rotational speed of a tire of a moving vehicle; when the sensed rotational speed reaches a predetermined rotational speed range, obtain a condition of the rotating tire through at least one sensor to generate a piece of first condition data; compare the first condition data with a plurality of pieces of pavement feature data to obtain the corresponding one; process with the obtained piece of pavement feature data and the first condition data to filter a pavement feature out of the first condition data, generating a piece of second condition data; determine whether the condition of the tire is abnormal based on the second condition data; and send out a warning message when the condition of the tire is determined as abnormal Whereby, the road security is improved.