A battery operated device includes a receiver for receiving a transmission that includes a postamble. A sensor, in a tire, measures a parameter of the tire and outputs data indicative of the parameter. A microprocessor is coupled to the receiver and the sensor. The microprocessor is configured to periodically partially awaken to determine whether the transmission is likely a forward link packet (FLP) by examining the postamble, and to transmit the data in a reverse link packet (RLP) in response to confirming that the transmission is a FLP.

System for conserving battery life in a battery operated device

wheel-state obtaining apparatus for a vehicle, including wheel-side devices (10-16) each having an air pressure sensor (32) for detecting an air pressure of a wheel tire of the vehicle, and a body-side device (18) having receiver antennas (20-26) and arranged to receive wheel-side information from the wheel-side devices through the receiver antennas and extract air-pressure information representative of the detected air pressure, that is, detected-air-pressure information, and wherein the body-side device includes an estimating portion (54) which is operable, in the event of a failure of any of the receiver antennas to receive the wheel-side information, to estimate the tire air pressure on the basis of detected speeds of the wheel, and obtain estimated-air-pressure information representative of the estimated air pressure. Thus, the wheel-state obtaining apparatus is capable of obtaining information on the air pressure even in the event of a failure of the receiver antennas (20-26) to receive the wheel-side information.

Wheel-state obtaining apparatus, and vehicle-state obtaining apparatus

Systems and methods for auto-location of tire pressure monitoring sensor units on a vehicle measure the angle of a wheel at two different times using a rim mounted or a tire mounted sensor and determines a difference in measured angles. The systems and methods provide for transmitting the angles and/or the difference in the measured angles along with a sensor identification to an electronic control module. Alternatively, the systems and methods provide for transmitting time differences to the electronic control module. The electronic control module correlates information transmitted from the wheel unit with antilock brake system data. A location of the wheel mounting the sensor is determined and the sensor identification is assigned.

System and method for performing auto-location of a wheel in a vehicle using wheel phase angle information

A tire pressure monitoring device includes a memory that includes a plurality of selectable communication protocols to govern communication and operation.

Universal tire pressure monitoring sensor

A communication device (e.g., an vehicle-mounted device) comprises a transmitter that transmits a distance-calculation signal with which to calculate a distance to a partner communication device (e.g., a mobile device), a detector that receives the distance-calculation signal returned from the partner communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received, and a calculator that calculates the distance to the partner communication device based on the phase difference detected by the detector.

Communication device and distance calculation system

A bi-directional dialogue is carried out between a portable code emitter (15) and a base station (1) for access to a motor vehicle. Both signals are correlated with each other and the dialogue repeated at an altered carrier frequency. The distance of the code emitter (15) from the base station (11) is determined from the difference in two phase difference measurements between the sent and received signal in one station (11 or 15). Access to, or use of the motor vehicle (10) is only permitted when the code emitter (15) is within a certain distance from the motor vehicle (10).

Method for measuring distance between two objects and method for controlling access to an object or the use thereof, in particular access control and driving authorisation for a motor vehicle

The method comprises the steps of monitoring the wheels (R1, R2, R3, R4,) of a motor vehicle having an antilock brake system (ABS), for fault states, in particular for incorrect tire pressures, the occurrence of a fault state and the wheel position (FL, FR, RL, RR) of the wheel (R1, R2, R3, R4,) at which the fault state has occurred being indicated. Each wheel (R1, R2, R3, R4,) to be monitored is assigned a wheel unit (E1, E2, E3, E4) which monitors the respective wheel (R1, R2, R3, R4,) for fault states, and wherein at least the wheel position (FL, FR, RL, RR) of a wheel (R1, R2, R3, R4,) at which a fault state has occurred is determined by means of output signals of sensors (S1, S2, S3, S4) of the antilock brake system (ABS).

Method and system for monitoring the wheels of a motor vehicle

A method of operating key-less access control device for a vehicle (1), in which a transmission- and receiving-unit (2) on the vehicle side, outputs a request signal for actuating an enabling device, and waits for the reception of an answer signal. A received answer signal is evaluated in the transmission/reception unit (2) and with authorisation, a control signal is generated and is used to lock or unlock a safety/security system. The request signal as a result of an enabling event, is intermittently and multiply outputted and a portable encoder (5) transmitting the answer signal, is enabled or remains enabled, for subsequent unlocking/locking procedures, if within a given time period no answer signal is received for at least one discrete request signal.

Key-less access control method e.g. for motor vehicle access authorisation

The invention relates to a system for monitoring the wheels (R1, R2, R3, R4) of a motor vehicle (10) for fault states, in particular for incorrect tire pressures, each wheel (R1, R2, R3, R4) to be monitored being assigned a wheel unit (E1, E2, E3, E4) which, after the reception of a trigger signal (TR), supplies data (D1, D2, D3, D4) which is suitable for detecting a fault state and/or for determining the wheel position (FL, FR, RL, RR) of at least one wheel (R1, R2, R3, R4). There is provision for a portable transmitter (12) which can be included with which a trigger signal (TR), in particular a radio-frequency trigger signal, can be generated for at least one wheel unit (E1, E2, E3, E4).

System and method for monitoring the wheels of a motor vehicle

A method for determining the wheel position (FL, FR, RL, RR) of wheels (R1, R2, R3, R4) of a motor vehicle (10) which, for monitoring purposes, in particular for monitoring the tire pressures, are each assigned a wheel unit (E1, E2, E3, E4) which transmits data (D1, D2, D3, D4) to a central evaluation device (ECU) of the vehicle (10), at least in response to a trigger signal (TR1, TR2, TR3, TR4, TR5, TR6). The wheel positions (FL, FR, RL, RR) of the monitored wheels (R1, R2, R3, R4) can be determined by activating a portable transmitter (12) whose position with respect to the vehicle (10) is sensed.

Method and system for determining wheel position

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