WABCO IVTM, System Description

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4
IVTM Components
20
Mode of function
After system installation, commissioning by PC diagnostic software must be per-
formed.
Any faults occurring during operation are stored in the electronic unit for diagnostic
purposes.
Design
Three standard versions of the electronic control unit (ECU) are employed:
in 220 012
• Trailer: 446 220 013 0
• Trailer Train: 446 220 014 0 (can be cascaded up to 5 times with 16 modules
D)
All ECUs are suitable for 12 or 24 volt operation and can be mounted on the vehi-
Software change
ce pressure has been extended downward to be-
sing
the diagnostic software. The new software allows different reference pressures to
Radio transmission
The ECU is mounted to chassis in central part of vehicle, so that perfect radio con-
tact with all wheel modules and connection between trailer ECU and towing vehicle
ECU is ensured. You should use special brackets for good radio contact.
The ECU immediately recognises all changes from programmed nominal tire pres-
sure values by combined comparison with threshold pressure values and pressure
changes.
Incorrect values of tire pressures are already displayed before departure (if ECU is
permanently powered).
The system may be extended up to 12 wheel modules for towing vehicles and for
trailers up to 16 wheel modules per ECU.
• Tow g vehicle and bus: 446 0
each)
ECUs essentially differ by radio communication signal structure and CAN bus (I
connection. External distinguishing mark by type label only.
Further ECU types are tailored to specific customer requests and have other pin
assignments.
cle frame.
ECUs produced after calendar week 43/07 already have new software installed.
The setting range for the referen
tween 3 and 10.5 bar. The software change allows the reference pressure to be set
within certain tolerances on-board. Furthermore, it is also possible to measure the
signal quality of the radio contact to the wheel modules and to display them u
be set per axle.
fig. 4-5: Bracket 960 901 050 4
ntact is provided by antenna integrated in the control unit housing that
re signal reception from all wheel modules even under most dif-
ficult operating conditions.
Radio co
guarantees pressu