jost 613403, User Manual

Page: 8 / 92

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 r
otat
ion
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.
For the EF-S system to work correctly, the wheels of the trail-
er/semi-trailer must be aligned according to the specifications.
Manually, the wheels can be steered according to both the Ackermann principle and the crab
steering principle
(see Figure 1-3)
.
Should an error occur while driving in a bend, then the steering beha-
vior will be different and this will affect the covered track of the trail-
er/semi-trailer combination.
Part no.: 162014 EN-1
4
Release 07/2020
User manual 2300 EF-S system