Tyre condition monitoring

Details Tyre condition monitoring Tyre condition monitoring

B - Operations, Transporting

60

C

B60C 23/00 (2006.01) B60C 23/04 (2006.01)

Patent

CA 2145174

A tyre condition monitoring system comprises a unit (1) having a sensor (2) for sensing pressure and temperature. The unit (1), which is mountable in a wheel of a vehicle comprises a voltage controlled oscillator (4) and a code generator (5) arranged such that a coded signal is generated in a time period related to the value of the pressure or temperature sensed by the sensor (2). The coded signal is transmitted from the unit (1) by a transmitter (8). In order to conserve power the unit (1) comprises a power supply (15) which is activated by a timer (16) from time to time causing the coded signal to be transmitted. A counter (11) moni- tors when the coded signal has been transmitted and, once transmitted, causes the power supply to be deactivated. A monitor cir- cuit (18) continuously monitors for an unacceptable condition. An override circuit (19) responsive to the monitor (18) or to an ex- ternal stimulus can also activate the power supply.

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