WABCO OptiTire, System Description

Page: 31 / 72

31
Components
5.2 ECU – The electronic control unit
Purpose and function
The ECU receives the sensor signals and immediately recognises all changes
from programmed nominal tire pressure 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).
Faults occurring during operation are stored in the electronic unit for diagnostic
purposes.
The ECU is mounted to chassis in central part of vehicle, so that perfect radio
contact with all sensors and between trailer ECU and towing vehicle ECU is
ensured. You should use special brackets for good radio contact.
Fixing bracket (WABCO part number: 446 220 000 4)
Radio contact is provided by antenna integrated in the ECU housing that
guarantees interference-free pressure signal reception from all sensors.
Information and technical data
ECU – THE ELECTRONIC CONTROL UNIT
WABCO part numbers
„
446 220 100 0: Towing vehicle and bus
„
446 220 110 0: Trailer and trailer train (can be cascaded up to 5 times with
22 sensors respectively, must be parametrized by diagnosis)
ECUs essentially differ by radio communication signal structure and CAN bus
(ID) connection. External distinguishing mark by type label only.
Further ECU types are tailored to specific customer requests and have other
pin assignments.
Supply voltage 12 or 24 volts
Mounting Central position on the vehicle chassis