A method of operating a Tire Pressure Monitoring System (TPMS) includes executing tire pressure monitoring of at least one tire installed on a vehicle in a first mode, and transmitting frequency signal loss information to a center if a loss of a frequency signal in the first mode occurs in a designated time period.

The invention relates to a method for estimating a current wheel circumference of at least one wheel arranged on a vehicle, said method comprising the following steps: (a) determining a reference speed of the vehicle at a point in time by means of a reference apparatus, (b) detecting a wheel rotational speed of the at least one wheel at said point in time by means of a wheel rotational speed sensor, (c) estimating a single wheel-circumference value based on the determined reference speed and the detected wheel rotational speed for said point in time by means of a calculation apparatus, (d) storing at least the estimated single wheel-circumference value in a circular buffer for said point in time, (e) repeating steps (a) to (d) for at least one other point in time, estimating a current wheel circumference based on the single wheel-circumference values stored in the circular buffer by means of the calculation apparatus, outputting the estimated current wheel circumference as a wheel circumference signal. The invention further relates to an associated device.

A computer and a method executable by the computer. The computer may include a processor and memory storing instructions executable by the processor. The instructions may include, to: receive sensor data from a sensor in a vehicle operating in a fully autonomous mode; using the data, determine a misalignment value; and based on the value, perform one of a plurality of vehicle driving functions that include stopping the vehicle.

An exemplary method for monitoring tire performance includes the steps of providing a wheel assembly comprising a tire and a tire characteristic sensor, providing a vehicle sensor configured to measure a vehicle characteristic, providing a controller in electronic communication with the tire characteristic sensor and the vehicle sensor, receiving, by the controller, tire characteristic data from the tire characteristic sensor and vehicle characteristic data from the vehicle sensor, determining, by the controller, whether a first condition is satisfied, if the first condition is satisfied, monitoring, by the controller, the tire characteristic data, determining, by the controller, an acceleration of the tire from the tire characteristic data, determining, by the controller, whether a second condition is satisfied, and if the second condition is satisfied, generating, by the controller, a control signal.

A method for evaluating the thermal stresses associated with the use of a tire mounted on a rim, the method comprising the steps during which a temperature of a gaseous fluid contained in an internal cavity of the tire, and a temperature of the rim, are measured at regular time intervals, and a temperature at at least one internal zone of the materials of which the tire is made is estimated using a pre-established law connecting this temperature to the temperature of the gaseous fluid contained in the internal cavity of the tire and to the temperature of the rim.

A tire damage detection method includes a preliminary stage comprising: performing tests involving test tire impacts against/on different obstacles at different motor vehicle speeds; measuring/acquiring test-related wheel speeds during the performed tests; computing test-related normalized wheel speeds based on the test-related wheel speeds; and determining a predefined tire damage model based on the test-related normalized wheel speeds corresponding to the test tire impacts and of associated test-related average wheel speeds. A tire damage detection stage comprises: acquiring signals indicative of a motor vehicle wheel speed; computing, based on quantities indicative of the wheel speed, a normalized wheel speed indicative of a ratio of the wheel speed to an average wheel speed indicative of motor vehicle speed; and detecting potential damage to a tire of the wheel based on the predefined tire damage model and on the normalized wheel speed.

A tire damage detection method includes a tire damage detection stage comprising: outputting quantities indicative of speeds of a vehicle and a corresponding wheel from an acquisition device to a processing device; computing, based on the received quantities, a normalized wheel speed indicative of a ratio of the wheel speed to the vehicle speed; and detecting a potential damage to a tire based on a predefined tire damage model and on the normalized wheel speed. A preliminary stage comprises: performing tests involving test tire impacts against/on different obstacles at different vehicle speeds; measuring/acquiring test-related wheel and vehicle speeds during the performed tests; computing test-related normalized wheel speeds based on the test-related wheel and vehicle speeds; and determining the predefined tire damage model to be used in the tire damage detection stage based on the test-related normalized wheel speeds and the test-related vehicle speeds that correspond to the test tire impacts.

A system for estimating a tire load of a tire includes a pressure sensor configured to generate a tire pressure signal; an acceleration sensor configured to generate a tire acceleration signal; a temperature sensor configured to generate a tire temperature signal; and at least one processor configured to calculate a duration of a contact patch based on the tire acceleration signal, calculate a vehicle speed based on the tire acceleration signal, determine at least one system model coefficient based on the tire pressure signal and the tire temperature signal, and calculate the tire load of the tire using a linear system model that relates tire pressure, the duration of the contact patch, and the vehicle speed to the tire load of the tire, where the linear system model further includes the at least one system model coefficient for calculating the tire load of the tire.

The present invention relates to an apparatus for monitoring a tire pressure. Provided is a tire pressure monitoring apparatus including: a radius analyzing unit which calculates a radius analysis value using a relative speed difference and an average speed calculated from wheel speeds of the wheels mounted on the vehicle; a regression equation calculating unit which calculates a first regression equation for the calculated radius analysis value and first driving information and a second regression equation for the calculated radius analysis value and second driving information; a mass calculating unit which calculates an additional mass of the vehicle; a calibration unit which corrects the calculated radius analysis value using a combination of the calculated first and second regression equations and the calculated additional mass; and a low pressure determining unit which determines a low pressure of a tire mounted on the vehicle using the corrected radius analysis value.

A vehicle and method for controlling the same are provided to provide more reliable tire pressure information than the existing tire pressure detecting system using a method of calculating a wheel frequency once every predetermined reference vibration count. The vehicle includes a sensor unit that measures a wheel speed and a controller that divides a vibration count of wheel derived based on the wheel speed by a predetermined reference vibration count to calculate at least one frequency. The at least one frequency is analyzed to derive a state of pressure of a tire mounted on the wheel, and the tire pressure state to be output is adjusted to then be output.