A wireless tire pressure detector automatic find and locate system and the operation method thereof are provided. The wireless tire pressure detector automatic find and locate system includes a plurality of wireless tire pressure detectors and a wireless host. The wireless host and each wireless tire pressure detector are wirelessly paired and connected through a wireless system, and a first wireless tire pressure detector is designated. The wireless host and the first wireless tire pressure detector detect signal data between the first wireless tire pressure detector and other wireless tire pressure detectors, and the first wireless tire pressure detector transmits the data to the wireless host for analyzing and positioning to localize each wireless tire pressure detector.

A transmitter is configured to be attached to each of wheel assemblies in a vehicle and execute a process in accordance with a command included in a trigger signal. The transmitter includes a condition detecting section, a trigger receiving section which receives, as the trigger signal, an unmodulated wave having a received signal strength indication a transmitting section, and a controlling section. When the trigger receiving section receives the unmodulated wave, the controlling section causes the transmitting section to transmit the signal in response to the unmodulated wave. The controlling section is configured to execute an accumulation process to accumulate reception time of the unmodulated wave from a starting point in time, and shift into a restriction state to restrict a response to the unmodulated wave when the accumulated reception time reaches a predetermined time.

The present disclosure relates to a system and method for a tire pressure monitoring system. Embodiments may include a first amplifier associated with a plurality of amplifiers that is configured to receive a signal. The plurality of amplifiers may be configured to generate a first output, wherein generating includes filtering the signal and increasing an amplitude of the signal. A fixed threshold comparator may be configured to receive the first output and to generate a second output, based upon, at least in part, the first output, wherein the second output has the same frequency as the signal. Automatic gain control logic may be configured to receive the second output and determine a number of cycles in a given time period, the automatic gain control logic may be further configured to determine whether a revision to a setting of the automatic gain control logic is necessary.

A method for detecting a change in location of at least one wheel of a motor vehicle, the vehicle having at least one central processing unit, one wheel unit which includes an electronic assembly of sensors and which is mounted on the wheel, and one bidirectional communications assembly. The method notably includes a first comparison step, during which a first evaluation pattern is compared with a first reference pattern to determine whether the location of the wheel has changed, the patterns being representative of the effective location of the wheel unit in the motor vehicle.

A tire pressure monitoring system (TPMS) sensor module as provided herein includes a pressure sensor configured to measure an internal air pressure of a tire and generate tire pressure information; a transducer configured to receive a structure borne sound signal induced by sound waves; a receiver circuit electrically connected to the transducer and configured to detect the structure borne sound signal and generate a detection indication that the structure borne sound signal has been detected; a processing circuit electrically connected to the pressure sensor and the receiver circuit, and configured to receive the tire pressure information from the pressure sensor, receive the detection indication from the receiver circuit, and generate a communication signal in response to receiving the detection indication; and a transmitter electrically connected to the processing circuit and configured to transmit the communication signal.

Approaches are provided where direct communications between tire pressure sensors are provided. One sensor may act as a teacher while other sensors may act as students and learn from the teacher sensor.

According to one embodiment, a method of improved communication between a wheel unit sensor and a master controller is disclosed. In this particular embodiment, the method includes determining, by the wheel unit sensor, whether a receive schedule of the wheel unit sensor indicates that a receive window has started. The method also includes in response to determining that the receive schedule indicates that the receive window has started, turning-on, by the wheel unit sensor, for the duration of the receive window, a wireless receiver of the wheel unit sensor. In this embodiment, the wireless receiver is configured to receive messages from the master controller.

A system for determining abnormalities of a TPMS that includes a pressure sensor that senses a pressure inside a tire and transmits sensed pressure data as a radio signal, a reception unit that receives the radio signal from the pressure sensor and measures strength of the received radio signal, and a determination unit that determines an abnormality of the TPMS based on the radio signal received, and the strength of the radio signal measured, by the reception unit.

A radio-transmitting sensor for a vehicle wheel, suitable for measuring at least one physical quantity and for transmitting a radio signal representative of this measured physical quantity. The sensor includes a measurement and transmission circuit, an antenna impedance matching circuit, and an antenna circuit. The sensor includes a sensitivity switch controlled by the measurement and transmission circuit and suitable for switching the antenna circuit according to two modes: a dynamic mode in which the antenna circuit is configured as a magnetic antenna, and in which the sensor transmits said radio signal representative of the measured physical quantity, this signal including transmitted data frames; and a static mode in which the antenna circuit is configured as an electric antenna.

A method for determining the instantaneous frequency and phase of a periodic signal includes: acquiring a periodic signal characteristic of the frequency to be determined and a particular point of which is characteristic of a reference of the phase of the signal; identifying, by optimization, a reference sequence in at least one consecutive portion of the signal; determining a temporal evolution of the frequency of the signal by computing a function of the lag between the identification of the reference sequence in at least one consecutive portion of the signal; determining an instant corresponding to a point characteristic of a reference of the phase of the signal in the course of the period of the signal, and deducing therefrom the temporal evolution of the frequency, the instantaneous phase of the signal with respect to the point characteristic of phase reference.