Abstract:
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.
Abstract:
A wheel assembly position identifying apparatus includes transmitters, each of which is provided in one of wheel assemblies and includes a transmission section and a control section, and a receiver, which includes a receiving section, a measuring section, and a wheel assembly position identifying section. The wheel assembly position identifying section is configured to detect, more than once, a rotational position of each wheel assembly at which the RSSI has an extreme value, for each position detecting signal received during one rotation of the wheel assembly, and identify the position of the wheel assembly in which the corresponding transmitter is provided based on variation of the rotational position of the wheel assembly at which the RSSI has the extreme value.
Abstract:
A tire pressure monitoring device for a wheeled vehicle that is capable of detecting vehicle motion from the output of a pressure sensor. The device determines from the output signal an indication of the power of the signal, for example the variance of the signal, and detects if the vehicle is stationary or in motion depending on the determined indication of power. The device may determine that the vehicle is in motion if the determined indication of power exceeds a threshold value.
Abstract:
An angular position is determined for an electronic module fixed to the inner face of the tread of a tire fitted to a wheel of a vehicle. A sensor for measuring the radial acceleration of the wheel is integrated into the electronic module, and a variation of the radial acceleration is detected that corresponds to a position of the electronic module when it contacts the ground. This variation is used to determine a frame of reference defined by an origin and a reference unit corresponding to an angular sector of the tire having a length is shorter than a mean length of the footprint of the grounded tire, in order to determine angular positions of the electronic module in the frame of reference.
Abstract:
A power efficient direct Tire Pressure Monitoring System, TPMS, for providing a non-continuous tire pressure monitoring of a tire of a vehicle, such as a automobile vehicle, the TPMS comprising: a processing unit having at least a first operating mode and a second operating mode; a timing unit; an acceleration measuring unit; a comparing unit; a pressure measuring unit; a transmitting unit; and, a power supplying unit for supplying power to the processing unit in the first and second operating modes wherein the latter mode is less power consuming than the former mode, wherein the processing unit is adapted to: enter the second operating mode after an acceleration threshold and an operating clock frequency have been set; and, enter the first operating mode responsive to a first trigger signal. A tire, a vehicle and a method are also claimed.
Abstract:
Provided is a tire air pressure monitoring device capable of accurately determining the wheel position of a transmitter. The tire air pressure monitoring device comprises: a transmitter installed on each wheel for transmitting detected air pressure information via a wireless signal; a rotational position detection mechanism disposed on the vehicle body side which detects the rotational position of each wheel and also outputs rotational position information to a communications line at prescribed time intervals; and a vehicle body side rotation position estimation mechanism that estimates the rotational position (i.e., number of teeth) at the time of transmission by the transmitters, on the basis of the reception information for the wireless signal from the transmitters and the rotation position information for the wheels input via the communications line.
Abstract:
A method is provided for real-time monitoring of tire pressure, wherein the pressure value determined by use of a pressure sensor in the tire is transmitted by an electronic wheel device, without the use of a trigger transmitter fixed on the vehicle, by radio, in short transmission intervals, to a monitoring device installed in the vehicle, only if, at least when the vehicle is not moving, the value is outside a prespecified normal range. When the vehicle is not moving, the electronic wheel device transmits a signal suitable for a system monitoring function, at certain time intervals and, using the same time frame or a whole-number fraction or multiple thereof, carries out a measurement of the tire pressure. The signal has a short transmission duration on the order of 25 μs to 500 μs.
Abstract:
A tire air pressure detecting device includes an air pressure detecting unit, a transmitting unit, a running state detecting unit, an air pressure change rate detecting section and a frequency adjustment section. The frequency adjustment section is configured to adjust a transmitting frequency at which the detected value of the tire air pressure detected by the air pressure detecting unit is externally transmitted by the transmitting unit according to the running state detected by the running state detecting unit and the air pressure change rate detected by the air pressure change rate detecting section. The frequency adjustment section is further configured to variably set a threshold value for switching the transmitting frequency from low frequency to high frequency according to the running state and the air pressure change rate.
Abstract:
Embodiments can provide a system, a wheel localizer, a wheel localization device, a method or a computer program for locating a position of wheel and/or for determining an acceleration of a wheel of a vehicle. The system for locating a position of at least one out of a plurality of wheels of a vehicle includes a detector configured to obtain information related to a tangential acceleration of the at least one wheel of the vehicle and an antilock braking system unit configured to obtain information related to angular rotations of the plurality of wheels. The system further includes a locator configured to determine the position of the at least one wheel based on the information related to the tangential acceleration of the at least one wheel and the information related to the angular rotations of the plurality of wheels.
Abstract:
A method for operating a tire pressure monitoring unit for monitoring pneumatic tires of a vehicle includes where a pressure measurement is taken at regular intervals using a pressure sensor and the pressure information is transmitted wirelessly at larger intervals by a transmitter. A control unit checks whether a pressure change exceeding a threshold value has occurred, and, if so, pressure measurements are taken at shortened intervals and the transmission activity is increased. The control unit uses a first threshold value for the pressure change in the case of a stationary vehicle and uses a second threshold value, which differs from the first threshold value, for the pressure change in the case of a moving vehicle. The control unit, by evaluating a signal of an acceleration sensor of the tire pressure monitoring unit, establishes whether the first threshold value or the second threshold value is used.