Disclosed is a method of locating the position of wheels of a vehicle equipped with an electronic unit for measuring operating parameters of each wheel, involving, for the purpose of locating the position of a wheel, the ordering of the transmission, by the electronic unit outfitting that wheel, of n RFi signals transmitted at times t.sub.1 to t.sub.n for angular positions .sub.1 to .sub.n of the electronic unit, to a central unit additionally connected to speed sensors that are each positioned in proximity to a wheel and able to furnish data .sub.1 representative of the orientation of the wheel.

A tire air pressure detection device has transmitters each detecting a running state of a vehicle on the basis of a detection signal of an acceleration sensor and transmitting a frame when it is determined that the vehicle is running. Because acceleration varies independently of a tire rotation speed, a frame can be transmitted even before a vehicle speed reaches or exceeds, for example, 30 km/h. Consequently, data on a tire air pressure can be transmitted in a short time period from a running start of the vehicle and hence a decrease in tire air pressure can be detected in a short time period from the running start of the vehicle.

Each time identification information specific to each of wheels is received, a rotation position of each of the wheels is obtained and accumulated as rotation position data of each wheel with respect to each piece of identification information. Then, with respect to all the identification information, when a first tentative mounting position and a second tentative mounting position are the same in a vehicle width direction and different from each other in a vehicle longitudinal direction, the first and second tentative mounting positions being mounting positions of two of the wheels where a smallest degree of dispersion and a second smallest degree of dispersion are detected, and when the first tentative mounting position determined for each piece of the identification information is different from one another, each first tentative mounting position is determined as the mounting position of each of the wheels corresponding to the identification information, respectively.

The present disclosure provides a method for monitoring a motion status of a vehicle, a related chip, and a system. The method includes: obtaining N acceleration values in a first axial direction collected from N times sampling and a maximum acceleration change value within a preset time period; and obtaining N acceleration values in a second axial direction collected from N times sampling and a maximum acceleration change value within the preset time period; determining whether the vehicle is in motion or in a first stationary state based on the acceleration values in the first and second axial direction; and in response to the vehicle being in the first stationary state, further determining whether the vehicle is in motion or in a second stationary state based on the maximum acceleration change values in the first and second axial direction.

A vehicle includes a front wheel assembly and a rear wheel assembly having different outer diameters. A wheel position identifying device includes a reception circuit and processing circuitry. The reception circuit is configured to receive a first transmission signal and a second transmission signal. The first transmission signal is transmitted from a transmitter attached to the front wheel assembly at a specific rotational position of the front wheel assembly. The second transmission signal is transmitted from a transmitter attached to the rear wheel assembly at a specific rotational position of the rear wheel assembly. The processing circuitry is configured to determine whether each of the transmitters is attached to the front wheel assembly or the rear wheel assembly based on a reception interval of the first transmission signal and a reception interval of the second transmission signal.

A method for communication between a wheel unit and a central processing unit of a TPMS system, the wheel unit being intended for integration in a wheel of a motor vehicle. The method includes the following steps, which are aimed at: transmitting a set of transmission frames containing information relating to the wheel that is associated with the wheel unit; and sending an acknowledgement frame once the central processing unit has received a frame of the set of transmission frames transmitted by the wheel unit. The method includes a step which is aimed at interrupting the sending of a frame of said set of transmission frames transmitted by the wheel unit.

Systems (100) and methods (200) are provided for estimating at least a load acting on a vehicle-mounted tire (122). In an embodiment, tire-mounted sensor (118) generates output signals corresponding to at least tire inflation pressure and footprint length. A linear model between load and footprint length for the tire is retrievably stored (214, 224), along with derived model coefficients as a function of at least sensed tire inflation pressure. Local controller (102), remote server (130), or other computing device (140) is linked to tire-mounted sensor and data storage (106, 134), and further configured to estimate the load (230) acting upon the tire from the linear model, based on at least footprint length, sensed tire inflation pressure, and the derived model coefficients (222), and to generate an output signal corresponding to the estimated load (240) for display (242, 244), wear detection (246), traction detection (248), or other control functions.

A wheel assembly position identifying apparatus includes transmitters, each of which is provided in one of wheel assemblies, and a receiver, which is provided in a body of a vehicle. Each transmitter includes a transmission section, an acceleration sensor, and a transmission-side control section. The receiver includes a reception section, which is configured to receive the signals, and a reception-side control section, which is configured to execute a first identifying process and a second identifying process. In the first identifying process, the positions of the wheel assemblies, in which the corresponding transmitters are provided, are identified based on variations of the rotational positions of the wheel assemblies at the time when the constant position signals are received. In the second identifying process, the positions of the wheel assemblies, in which the corresponding transmitters are provided, are identified based on the received signal strength indications (RSSIs).

Tire pressure control devices include first sensors to deliver repeatedly a measured value M1 for the rotation speed of the wheel. A measurand, from which the rotation speed of the associated wheel can be derived, is detected in a pointwise manner by means of a second sensor over a predetermined rotation angle of the wheel as a function of time, is subjected to a low pass filtering in a subsequent first time interval t1 and from the filtered development of the measurand a second measured value M2 is determined, which is a measurement for the rotation speed or respectively for the angular speed of the associated wheel. Each tire pressure control device transmits at the end of a second time interval t2 the second measured value M2 together with an identification of the tire pressure control device to a central unit. Comparing M1 and M2 determines wheel position.

A method for transmitting n identification signals (P1-P4) formulated according to n different protocols, using an electronic casing (6) provided on a wheel (2) of a vehicle, as part of an angular correlation locating procedure. An electronic casing (6) is used, which is programmed to carry out, per wheel turn, x transmissions commanded for x angular positions offset from each other by predetermined angular values and, during each sending operation, a fixed angular position of the electronic casing (6) is determined, to which position is assigned the reference angular position function for determining the x transmission angular positions of the electronic casing, and a burst of n identification signals sent consecutively for transmission successive angular positions of the electronic casing (6) is transmitted, each of the signals being formulated according to one of the n protocols and including data for identifying the electronic casing and the transmission angular position thereof.