During automatic steering, the angular rotation of the wheels of the trailer/semi-trailer is
100% up to a vehicle speed of 30 km/h(see Figure 1-2). That means that the steering angles of
the trailer’s wheels are exactly the same as the pre-set angular rotations. The angular rota-
tions reduce at a speed of 30-50 km/h. They are, therefore, smaller than the pre-set angles.
At speeds above 50 km/h, the wheels of the trailer/semi-trailer are no longer steered when
the tractor unit changes direction. The centring function automatically becomes active at a
speed of more than 65 km/h.
2300_100_22
20
40
60
80
100
120
0
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
km/h
%
Speed
Angular rotation
Figure 1-2
The EF-S system uses two EBS signals:
n The speed signal
n The on/off signal
To determine the speed of the articulated vehicle, the EF-S system uses the speed signal.
The on/off signal is used to start the battery-charging main control unit when EBS becomes
active.
FortheEF-Ssystemtoworkcorrectly,thewheelsofthetrail-
er/semi-trailermust bealignedaccordingtothespecifications.
Manually, the wheels can be steered according to both the Ackermann principle and the crab
steering principle (see Figure 1-3).
Shouldanerroroccurwhiledrivinginabend,thenthesteeringbeha-
viorwillbedifferentandthiswillaffect thecoveredtrackofthetrail-
er/semi-trailercombination.
Part no.: 162014 EN-1
4
Release 07/2020
User manual 2300 EF-S system
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