WABCO IVTM, System Description

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IVTM
3
System Description
3 System Description
This chapter describes the mode of operation of the IVTM system. Furthermore,
you will also obtain information concerning technical reports for installing and retro-
fitting.
3.1 IVTM Basic Functions
fig. 3-1: Solo system
A
Electronic Control Unit (ECU)
B
Wheel module
C
Display
Each wheel continuously transmits actual tire pressure to a central electronic con-
trol unit (ECU). The signals of all wheels are evaluated there and the information is
conveyed to a display in the driver's cab.
Measuring
Wheel modules measure the air pressures on the conventional valves every 15
minutes and transmit them to the ECU. If the pressure changes critically then the
wheel module would sent the values in shorter periods.
Evaluating
Evaluation is far more than just comparing a current pressure value with an al-
lowed one and sending a warning message on falling below. The ECU discrimi-
nates a real problem situation from usual pressure fluctuations during vehicle op-
eration also on bad road conditions or uneven load.
In the event that an irregularity occurs then this fact would not only be reported on
the display but the wheel in question would be exactly indicated too.
An IVTM ECU can receive and process data from up to 16 wheel modules each
and further ECUs. Dual tires will each be fitted with individual sensors. Sensor
pressure range is between 2 and 14 bar corresponding to nominal pressure values
from 3 to 10.5 bar.
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