Wirtgen Gmbh

Markus Bach

Stefan Wagner

Axel Mahlberg

Christian Berning

Markus Schäfer

Eduard Fitz

Markus SCHÄFER

A self-propelled construction machine comprises a machine frame, at least three travelling devices, at least one hydraulic drive system for driving at least two travelling devices, wherein the hydraulic drive system comprises at least one controllable hydraulic motor with variable displacement volume and at least one hydraulic pump, at least one working device (e.g. a milling drum), for working the ground pavement. A detection device detects fluctuations in the longitudinal speed of the construction machine during movement thereof, wherein a control unit alters the displacement volume of the at least one controllable hydraulic motor as a function of the detected fluctuations so that the natural frequency of the hydraulic drive system is altered, wherein the control unit adjusts the discharge volume of the pump as a function of the amount of adjustment of the displacement volume in such a fashion that the specified drive speed remains constant.

Self-propelled construction machine and method for working ground pavements

In a self-propelled construction machine (), in particular road milling machine, recycler, stabilizer or surface miner, comprising a machine frame (), at least two travelling devices (), at least one hydraulic drive system () for driving at least two travelling devices (), at least one working device, in particular a milling drum (), for working the ground pavement (), it is provided for the following features to be achieved: a detection device () is provided which detects fluctuations in the longitudinal speed (v) of the construction machine () during movement of the construction machine (), wherein a control unit () controls the hydraulic drive system () as a function of the detected fluctuations in such a fashion that the drive speed (v) for driving the travelling devices () specified by means of the hydraulic drive system () is continuously adjusted so that the detected fluctuations are reduced or compensated for.

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Bonn, Germany

Markus Bach