User's Manual

TSS 2. Generation, “AUDI B6 / C6”
Tire Safety System TSS 2nd. Generation,”AUDI B6 / C6”
Dept. BEE
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Bedienungsanleitung TSS 2.
Generation, “AUDI B6 / C6
User Manual 2
nd
Generation “TSS AUDI B6 / C
6
freigegeben am /date of release
11.05.04
2 Functional description
The wheel electronics are mounted within the tires and measure tire pressure, temperature
and wheel electronics. The measured data is sent from the wheel via a send stage in the
wheel electronics. A system with relatively seldom measured data transfer is adequate for tire
pressure monitoring provided it features the additional option of detecting sudden pressure
loss. This enables the electronics in the wheel to be designed for minimum power draw and
battery operation.
All wheel electronics have their own code (ID) that is forwarded with the data at each
transfer. The HF transfer occurs in the 433 MHz range, referred to as the ISM range and/or in
some countries in the 315 MHz range. The trigger functionality of the C6 High Line System is
achieved by a 125kHz LF channel.
All wheel electronics send measured values every 30 seconds if it detects a radial
acceleration > 11 g (vehicle moving). The wheel electronics send no data when the vehicle is
stood. With the C6 High Line system, the wheel electronics are called-up for sending data
messages by the control unit via the trigger sender every 54 s. Tire pressure and wheel
electronics temperature are also measured every 3 seconds. When a pressure loss 0.2 bar
on the last send pressure value is detected, the wheel electronics switch immediately to fast-
send mode. In this situation, the wheel electronics measure and send every 0.8.
The TSS measures and transfers considerably more data than is necessary to ensure
reliable basic function. It can therefore use a data transfer path that is not assigned for the
error-free transfer of each individual data protocol. The B6 and C6 LowLine systems send
measured data from wheel to vehicle using a unidirectional HF transfer. During this HF
transfer, data messages can be destroyed by incidental, external interference sources or
through statistical fluctuations of the receive amplitude due to varying receive relationships in
the wheelhouse for wheel rotation and wheel position. The C6 High Line system employs the
trigger functionality and requests again an implausible and/or non-received data message
from the corresponding wheel electronics.
The data sent by the wheel electronics are received via the digital antenna and decoded. The
decoded data are transferred onwards to the control unit via a digital interface (LIN interface).
In the B6, the antenna is installed in the rear bumper, in the C6, in the roofliner.
The control unit evaluates the received data and forwards the information to the driver
information system as required. This provides the driver with information on the necessary
tire pressure or tire tension adjustments.