The constellation is not always favorable, one axle pulls, even if equipped with twin tyres, and four others run along. But much worse: Most of the weight in the trailer is
distributed over the area of the rear three axles.
Remedy is initially possible by lifting the first of the three axles, if it is a lift axle. As a result, the weight is distributed more strongly to the drive axle. The weight of the raised
axle is even partly added.
Of course, the many axles have the purpose not to stress the road surface too much. According to EC directives, they can be loaded up to 30% for a short time, but only up
to a speed of 30 km/h.
In order to avoid an overrun of either 30% or 30 km/h, and at the same time a further stop to lower the axle on a difficult terrain and thus a new start-up weakness, Knorr
has developed an automatic lift axle control integrated into the TEBS braking module.
With appropriate prerequisites and if there is no lifting axle, more pressure can also be exerted on the drive axle via the control of the individual axle air suspension. The
start of the application can be triggered automatically or by the driver.