TEBS E
6
GIO functions
59
6.1 Lifting axle control
Vehicle type
Trailer vehicle with one lifting axle or multiple lifting axles.
Lifting axle control in drawbar trailer
With a 3-axle drawbar trailer, it is possible to use axle 2 or 3 as a lifting axle. If the
TEBS Modulator is installed on the front axle of the vehicle, the rear axle, which
remains on the ground, must be monitored with an external pressure sensor.
Purpose
Lifting one axle of the partially laden or unladen vehicle reduces tire wear, particu-
larly while driving around curves.
Function
Control of the lifting axles via TEBS E depending on the current axle load and the
current load status.
Several lifting axles of a vehicle can be controlled jointly or separately.
The driving speed at which it is still permitted to lift the lifting axle(s) can be set.
The sequence in which the axles are lifted can be set in the parameter settings.
Parameters are set for the pressure applied for lifting and lowering the lifting axle.
The 1st lifting axle is always lifted first, then the second lifting axle.
The TEBS E Diagnostic Software provides intelligent bellows pressure values for
the lifting axle control. However, these suggestions can be adapted by the user for
special vehicles (e.g. 3-axle drawbar trailer with forklift transport).
The position of the lifting axles is transmitted to the ‘Towing vehicle’ CAN interface
and can be displayed there on the instrument panel provided the required towing
vehicle equipment is installed.
The bellows and supply pressure are checked in TEBS E1 or later.
The lifting axle is no longer raised if the vehicle has been lowered to
the buffer or the supply pressure is too low (< 6.5 bar).
A new plausibility check for the lifting axles is also integrated when
lifting or lowering to prevent a so-called yo-yo effect. This yo-yo effect
always occurs if the pressure difference between lifting/lowering pres-
sure is < 1.0 bar.
This pressure difference is checked by the TEBS E Diagnostic Soft-
ware on entry and an appropriate message is provided when entering
the parameter.
If the ISO 7638 power supply does not exist while the towing vehicle is
driving and therefore the ECU is supplied only via the 24N stop light
supply, there is no lifting axle control.
Only if ISO 7638 power supply is guaranteed and v = 0 km/h, will the
lifting axle control work correctly.
Setting the behaviour of the lifting axle when the ignition is
switched off
With a spring returned lifting axle valve (LACV), the lifting axle is al-
ways lowered when the ignition is turned off. With a pulse-controlled
lifting axle valve, the lifting axle can remain in lifted position.
Up to three pulse-controlled valves can be controlled in parallel on the
TEBS E Modulator.
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