A mode-swappable tire pressure detection system and a method of operating the same are provided and applied to tires of motor vehicles. The mode-swappable tire pressure detection system has a tire pressure detector. The tire pressure detector has a memory module. The memory module is configured with sensing modes, rendering the tire pressure detector capable of switching between different sensing modes. When a user issues a control instruction to a host or the tire pressure detector, the tire pressure detector can switch between different sensing modes through the memory module.

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.

A system for detecting leaks of tires of a vehicle is provided that includes sensors that measure pressure and temperature of the tires. The system has a processor that obtains the data from the sensors and detects a leak of one of the tires by using a natural leak model and/or a damage comparison model. The natural leak model uses temperature measurements of the tires to detect leakage of the tire which can be a slow leak of the tire. The damage comparison model detects leakage of the tire by comparing it to other tires on the vehicle.

In a method for controlling a processor on a wheel, wheel operation parameters are calculated and transmitted to a CPU. A first default operating mode (standby mode) is defined, during which activities related to calculating and checking the characteristic data of the tread mark of the tire are deactivated, a second operating mode for detection of significant changes in the value of a characteristic datum of the tread mark, sought during the appearance, in standby mode, of at least one event likely to be preceded by a significant change in the value, and a third operating mode for calculation and transmission, to a CPU, a sequence of values representing the characteristic datum of the footprint, sought during the confirmation, in detection mode, of a significant change in the value of the characteristic datum of the tread mark, and at the end of which a switch is made into monitoring mode.

A tire monitoring device and method in which an error can be detected and indicated. The tire monitoring device includes an indicator and a wireless communication interface. The method of operating the tire monitoring device includes: receiving an instruction to measure a tire pressure via the wireless communication interface; measuring a tire pressure; determining an error status of the tire pressure monitoring device; and responsive to a determination that the error status is not indicative of an error, activating the indicator to provide an indication based on the tire pressure.

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 tire parameter measurement method, device, and system of using the same are described herein. One method includes an inflatable tire and wheel assembly with an internally mounted pressure sensor apparatus, measuring pressure values, associating the sensor to an identification reader to receive the pressure values from the pressure sensor, and notifying a user of the measured pressure.

A tire pressure monitoring system monitors the pressure in at least one tire supporting a vehicle. The system includes at least one sensor mounted on the tire for measuring a pressure and a temperature of the tire. Transmission means transmit the measured pressure data and temperature data to a processor, and a tire pressure model is executed on the processor. The tire pressure model includes a driving event extractor to extract cold pressure data from the measured pressure data, and a temperature compensator to generate a compensated cold tire pressure from the cold pressure data. A noise filter filters sensor noise and generates a filtered cold tire pressure from the compensated cold tire pressure. A detection module receives the filtered cold tire pressure and determines an air pressure leak rate of the tire, and a leak notification corresponding to the air pressure leak rate is generated.

The invention provides a tire inflation pressure method and system. A tire inflation pressure adjustment signal is generated in order to maintain the centerline length of the tire's footprint within a range that allows the good performance of the tire. In embodiments of the invention, a linear relationship between tire inflation pressure, footprint centerline length and vehicle load are exploited to allow for an efficient implementation.

A tire pressure monitoring unit is mounted on a vehicle wheel having a pressure and acceleration sensor. A method for assigning wheel positions includes pressure and acceleration data determined from the sensors. The pressure data and at least one piece of information derived from the acceleration data are transmitted wirelessly in a data telegram together with a characteristic identifier. Information concerning the reliability of the information derived from the acceleration data is acquired in the tire pressure monitoring unit on the basis of the measurements and is transmitted with the data telegram. A central evaluation unit considers a plurality of data telegrams and, taking account of data from the ABS sensors, assigns the individual tire pressure monitoring units to wheel positions. Data telegrams in which the reliability is higher receive a greater weighting, and data telegrams in which the reliability is smaller receive a smaller weighting.