audi debuts tyre pressure monitoring system

["Dave Eaton" <Dave.Eaton@clear.net.nz>]

on the a8/s8, and later for other models.....

dave
'95 rs2
'90 ur-q
'88 mb 2.3-16
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"The tyre-pressure monitoring system consists of battery-operated wheel
electronics, mounted on the valve inside the tyre. A sensor measures the
tyre’s pressure and temperature. These values together with additional data
are then transmitted with the individual wheel code as a data telegram. The
radio aerials integrated into the wheel arches are not visible from outside;
they receive and transmit the data telegrams and forward them via screened
twisted-pair cables to the control unit. This evaluates the data telegram,
identifies the tyre from which the information comes and assigns it a
priority level.

"The tyre pressure is measured every three seconds, but unless something is
seriously amiss, only transmitted to the control unit every 54 seconds. The
driver only receives messages if tyre pressure problems arise. If the
measured values start to drop by 0.2 bar per minute, however, the system
shifts to a faster transmission mode: it then takes a reading every 0.8
seconds. The driver is advised to stop the car in good time and can bring it
safely to a standstill.