Tyre condition monitoring system
First Claim
1. A tyre condition monitoring system, comprising:
- at least one wheel transceiver unit mountable in a wheel of a vehicle; and
a central transceiver unit for transmitting commands to the at least one wheel transceiver unit and receiving tyre condition data transmitted in reply to said commands from said wheel transceiver unit, wherein the transmission of each command is preceded by a preamble and wherein the preamble comprises a plurality of preamble periods in which time information is transmitted relating to the time until the command will be transmitted and the wheel transceiver unit is arranged to respond to said time information by powering down depending on the time remaining until transmission of the command.
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Abstract
A tyre condition monitoring system comprises a wheel transmitter unit for each wheel of a vehicle. The transmitter unit is mountable in the wheel and has sensors for sensing pressure and temperature in and rotation of the wheel. Signals from the sensors are processed by a processor to produce data which is transmitted via a radio frequency transmitter. The data is transmitted with the data representing a unit identity code. Transmitted data is received by a receiver unit where it is analyzed to determine the condition of the tyre. The receiver unit includes a user operable input for setting threshold limits for the temperature and/or pressure such that if a threshold is passed an alarm is sounded. Each wheel transmitter unit includes a power supply and is arranged so that power is only applied during the sensing and transmission of data. Intervals between transmissions of data can be varied depending on whether rotation of the wheel has been sensed.
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Citations
24 Claims
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1. A tyre condition monitoring system, comprising:
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at least one wheel transceiver unit mountable in a wheel of a vehicle; and
a central transceiver unit for transmitting commands to the at least one wheel transceiver unit and receiving tyre condition data transmitted in reply to said commands from said wheel transceiver unit, wherein the transmission of each command is preceded by a preamble and wherein the preamble comprises a plurality of preamble periods in which time information is transmitted relating to the time until the command will be transmitted and the wheel transceiver unit is arranged to respond to said time information by powering down depending on the time remaining until transmission of the command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24)
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13. A transceiver circuit, comprising:
- an oscillator circuit for providing a reference frequency signal, a modulating circuit for modulating a data signal representing data to be transmitted with the reference signal and outputting the modulated signal for transmission, a receiver circuit for receiving a modulated data signal which receiver circuit is arranged to receive also signals from the modulating circuit derived from the reference signal, and a demodulating circuit for demodulating the received signal to extract the data therefrom.
- View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
Specification