Huf Baolong Electronics Bretten TSSRE4B, TSSRE4PB, TSSRE3B, TSSRE3PB Users Manual

Reifendruck-Kontrollsystem

Tire pressure monitoring system

1 Description of the system

The tire pressure monitoring system is applied for the permanent control of the tire pressure during
driving and also during standstill periods.
An electronic system which is installed in the interior of the tire measures the tire pressure and the
temperature in regular intervals and transmits information to a central control unit by means of a high
frequency transmission line. The control unit evaluates the incoming data and transmits the information
to the driver, if required. In the case of a puncture, the driver is given a warning, and he is also informed
when the tire pressure should be corrected.

2 System components

The tire pressure control system consists of the following components:

• or 5 aluminium valves

• 4 or 5 electronic units in the wheels (sensor and high-frequency sending unit)

• 4 or 5 receiving antennas

• a special connecting cable appropriate for high-frequency transmission, between the receiving

antennas and the control unit

• a control unit (high-frequency receiver and evaluation system)

•

option: keying device for entering a default pressure

Figure 1: components of the tire pressure monitoring system

At present, an individual output unit is not available, since the output of the messages to the driver is
done via the driver information system belonging to the standard equipment.

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Reifendruck-Kontrollsystem

Tire pressure monitoring system

Figure 2: schematic representation of the system´s layout in a vehicle

2.1 Electronic wheel unit

The battery-based electronic wheel units are mounted inside the tires to measure the tire pressure
and the temperature of the electronic wheel systems. Every electronic wheel unit
has an individual code (ID), which is transmitted with every message. Furthermore, the data telegram
includes information about the remaining service life of the battery.

The measured data are transmitted from the wheel through a transmission point.
A tire pressure monitoring system has to carry out two main functions: The recognition of a pressure
loss and the measurement of the absolute pressure.
For the measurement of the absolute pressure, a relatively low frequency of measurement data
transmissions is sufficient, a pressure loss must be transmitted immediately. The electronic wheel
system shifts automatically to the various operating modi in order to carry out these functions at a
minimum power consumption.

Transmitting intervals

• Normally, every electronic wheel unit measures the tire pressure and the approximate
temperature of the air in the tire every three seconds but if the measured values are stable, sending
processes are carried out only every 54 seconds.

• At a pressure loss of more than 0.2 bar per minute, the electronic wheel unit shifts temporarily to
a high transmission frequency. It will then carry out measurements and sending processes every

0.8 seconds. This energy management allows battery-based operation with a sufficient service life.

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