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System description
System description
5.3.1 OptiTire in trailer operation
Operating mode
The OptiTire system in the trailer operates self-sufciently 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 tire pressures of the trailer can be transmitted by a radio signal to an OptiTire system
in the towing vehicle.
This wireless transmission can only occur if the external sensors are congured 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 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 the towing vehicle and trailer when actuating the brake. The trailers ECU sends a radio
signal with the 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.
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