3
IVTM
System Description
10
Displays
WABCO is offers a driver's display for indicating warning messages and tire pres-
sure checking.
For certain vehicles the data can also be transmitted to an integrated display as an
alternative. Detailed description of display functionality is given in chapter "Opera-
tion"(see chapter 5, page 25).
IVTM, and therefore TPI, cannot announce sudden, extreme tire damage caused
by external effects.
3.2 IVTM at trailer-towing operation
Operating mode
Initially, the IVTM system on the trailers will work self-sufficiently if there is a power
supply. In order to display tire pressure and trailer warnings to the driver during
driving, however, it is necessary to install IVTM to both parts of vehicle, which
means one control unit to the trailer and one unit to the towing vehicle.
Any towing vehicle equipped with IVTM could be connected to any trailer equipped
with IVTM.
Variants
The IVTM for trailer vehicles can be operated using the WABCO SmartBoard as
well as for stand-alone versions.
Tire pressure values, in connection with WABCO TCE or EBS, can be transferred
to the towing vehicle's CAN bus via standard CAN data connection according to
ISO 11992 (only in connection with appropriately prepared towing vehicle).
Automatic trailer recognition
Control unit of towing vehicle identifies control unit of trailer automatically: The stop
light is enabled on towing vehicle and trailer when hitting the brake. The trailer
ECU radios a signal with this voltage pulse that is expected by the towing vehicle's
ECU that instant. The towing vehicle thus clearly detects that the trailer belongs to
the tractor/trailer combination and subsequently transmits trailer ECU messages to
the display.
As trailers are usually not permanently powered, it is possible that due to the fre-
quency of wheel modules transmission the tire pressure data for all the wheels of
the trailer is not available in the display for up to 15 minutes after starting the drive.
3.3 Configuration for bus and towing vehicle
In this chapter, you will learn which components you require for your vehicle.
Selection of IVTM components depends on vehicle type, type and number of
wheels and type of systems connected to IVTM but not on the vehicle system volt-
age.
ECU
Trucks, buses or articulated buses are equipped with the ECU 446 220 012 0.
Display
IVTM display 446 221 000 0 is used for the retrofitting of the display and operation
devices. Original equipment, however, will often address a central computer via
CAN with the latter controlling indication of the integrated dashboard-mounted dis-
play.
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