1 Description
The following paragraphs contain information about the components that make up the EF-S
system and how the system works.
1.1 Operation
The EF-S system is a total system developed by TRIDEC. Its purpose it to steer trailers/semi-
trailers with one or more steered axles.
It allows the driverto alter the steering angle of the wheels on the steered axles when man-
oeuvring a trailer/semi-trailer, which makes manoeuvring easier. Once the manoeuvring has
been completed, the wheels can be turned back to the driving direction, either manually or
automatically.
The EF-S system allows the driver to steer the trailer/semi-trailer either manually or auto-
matically. When the “Automatic” function is active, the EF-S system only steers according to
the Ackermann principle (see Figure 1-1).
Figure 1-1
With the Ackermann principle, each steered wheel draws a circle. The middle points of
these circles are all in the same place.
The wheels of the trailer turn depending on the angle (0WS) (see "System info" on page74)
between the tractor unit and the trailer/semi-trailer. These angular rotations are determ-
ined in advance and are set per axle in the EF-S system’s program. The EF-S system has a
centring circuit and a number of steering circuits (dependent on the order).
Part no.: 162014 EN-1
3
Release 07/2020
User manual 2300 EF-S system
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