5
TEBS E
braking system
40
5.9.2 Load Sensing Valve (LSV)
1-circuit Axle load determination
Vehicle type
Trailers with all suspension types.
Purpose
Trailer EBS E includes a load-dependent braking pressure control, with which the
braking pressure is adapted to the load status. Characteristic curves are stored
based on the braking calculations via the parameter settings.
The current load status is determined by sensing the air-suspension bellows pres-
sure, the hydraulic pressure, by evaluating the compression travel with mechanical
suspension or derived from the rotational speed differentials of the wheel speeds in
two axles sensed with rotational speed.
Semitrailers and drawbar trailers are controlled differently.
2-circuit Axle load determination (right/left)
Vehicle type
Trailer vehicles with separate hydraulic suspension or air suspension per side.
Purpose
This function enables the creation of a right-left average value of the axle loads.
This improves the braking behaviour of the trailer (more precise determination of
the actual load status). An additional axle load sensor is installed on the main axle
c-d, which must be set in the TEBS E Diagnostic Software as a second External
axle load sensor c-d.
Determining the axle loads
The axle load of main axle c-d can be determined with the following options:
• Measuring the air spring pressure with a pressure sensor integrated in the
modulator with air-suspension vehicles
• Measuring the air spring bellows pressure using an external pressure sensor for
air/hydraulically suspended vehicles (External axle load sensor c-d)
• Measuring the compression travel with a height sensor for mechanically sus-
pended vehicles
The axle load of additional axle e-f can be determined with the following options:
• Measuring the bellows pressure using an external pressure sensor for
air/hydraulically suspended vehicles
• Measuring the compression travel with a height sensor for mechanically sus-
pended vehicles (External axle load sensor e-f)
• Determining the axle load via slip detection in 4S/3M systems
Safety function ‘Vehicle on buffer’
If the bellows pressure is less than 0.15 bar and less than 50 % of the defined
empty bellows pressure (always the lower value), the LSV characteristic curve
‘Laden’ is controlled because the vehicle frame is probably resting on the buffer of
the axle and no reliable conclusion can be drawn regarding the load status.
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