WABCO TAILGUARD, System Description

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System and function
Silent mode: If a buzzer is connected, it can be deactivated temporarily by
engaging the reverse gear twice (within 3 seconds), e.g. when making deliveries
in residential areas.
Depending on the parameter settings, the entire TailGUARD function can be
deactivated temporarily by engaging the reverse gear twice.
The distance information is indicated to the driver in accordance with the
respective system configuration as soon as an object is detected within
3 metres of the rear of the vehicle.
Vehicles with Trailer Remote Control: The distance to the object is indicated
in green, yellow or red bars and a tone whose frequency changes with the
distance.
Braking via a prepared interface for TailGUARD:
Indication is implemented via the instrument panel.
Vehicles with option: Indication via flashing rear outline marker lamps.
5 .2 Reverse monitoring system
The ultrasonic sensors transmit ultrasonic waves to the area behind the vehicle.
If an object or a person reflects these sonic waves, the ultrasonic sensors
receive an echo. The distance to the object is calculated from the time the
ultrasonic waves take from transmission to reception of the echo.
The distance to detected objects is indicated by means of LED bars in the
driver's cabin. Alternatively, the distance can be indicated by a flashing
frequency of the rear outline marker lamps or an additional lamp in the
instrument panel.
TailGUARD can support up to 6 sensors. Each ultrasonic sensor monitors an
area that is similar in shape to a flattened club. By arranging the ultrasonic
sensors on the vehicle accordingly, objects near the roof area or the ground, for
example, can also be identified.
All ultrasonic sensors are connected to one input on the electronic control unit
as a LIN (Local Interconnect Network), which connects all ultrasonic sensors as
a tree structure.
Each ultrasonic sensor is assigned its own LIN address so that its data can be
evaluated separately within this network.
The maximum permitted cable length between ECU and the last ultrasonic
sensor is 40 m.