WABCO OptiTire, System Description

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System description
4.3.1 OptiTire
TM
in trailer operation
Operating mode
The OptiTire
TM
system in the trailer operates self-sufficiently if supplied with
power.
Tire pressures can be displayed with the SmartBoard. In addition, the tire
pressure information is transmitted to the towing vehicle via the ISO 7638 CAN
connection.
!
Not all towing vehicles display the tire pressures transmitted via CAN in the
dashboard. Please contact the manufacturer of the towing vehicle if you have
any questions on this subject.
Alternatively the trailer’s tire pressures can be transmitted to the OptiTire
TM
in
the towing vehicle by means of a radio.
This wireless transmission can only occur if the external sensors are configured
on both vehicles.
Apart from the display of trailer tire data in the towing vehicle, this data can also
be transmitted directly to the haulage company by means of telematics. The
combination of OptiTire
TM
with TX-TRAILERGUARD
TM
is of particular interest if
the trailer is transported by subcontractors or rented to third parties.
Automatic trailer recognition
The towing vehicle ECU automatically detects the combination with a trailer
ECU: 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
frequency of sensor transmission the tire pressure data for all the wheels of the
trailer is not available in the display for up to 21 minutes after starting the drive –
depending on the sensor used.