User's Manual

Truck TSS
Tire Safety System TSS for trucksfor trucks
Dept. BEE
Dokument Nr.:
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modification:
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00
a
User Manual TSS
User Manual TSS
freigegeben am /date of release
2/20/06
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. The optional trigger receiver (125kHz LF channel
receiver inside the wheel electronic) can be used to implement future auto location functionality in Truck TSS.
Tire pressure and wheel electronics temperature are measured every 5 seconds and were transmitted
periodically every 60 seconds together with Wheel electronic identification and additional wheel electronic status
information. When a pressure loss > 0.4 bar on the last sent pressure value is detected, the wheel electronics
switch immediately to fast-transmitting mode. In this operation mode, the wheel electronic measures and sends
every 0.8 seconds.
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. In case of a critical pressure loss, fast transmitting mode enables the generation of a warning
immediately.
The data sent by the wheel electronics is received via the digital antenna and is decoded. The decoded data is
transferred onwards to the control unit via a digital interface (LIN interface).
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.
The main functional characteristics of the control unit are:
- A central warning algorithm
- Generation of wheel position specific, pressure and temperature based warnings
- The vehicle-specific connection for the power supply system and OEM specific operation and display
integration.
The essential feature of adaption to several wheel configurations is the possibility to adapt the truck TSS to the
numerous truck applications available into the market.