Patent ID: 7322802

Claim:
A thick matter pump comprising: a drive motor ( 50 ), a variable displacement hydraulic pump ( 6 ) coupelable to the drive motor, two hydraulic cylinders ( 5 , 5 ′) connected to the hydraulic pump and driven in counterstroke, one conveyor cylinder ( 7 , 7 ′) coupled respectively to each hydraulic cylinder, a rotational speed regulator for regulating the rotational speed of the drive motor, a displacement volume regulator ( 20 ) associated with the hydraulic pump for regulating the displacement volume, and a control module ( 54 ) for regulating the thick matter conveyance capacity by regulating (a) the rotational speed of the motor and (b) the displacement volume of the hydraulic pump via the rotational speed regulator and the displacement volume regulator ( 20 ), wherein the control module ( 54 ) includes a final control element ( 56 ) for selecting the desired thick matter conveyance capacity (F) of the conveyor cylinders ( 7 , 7 ′) and an electronic control unit ( 108 ) which reacts to the position of the final control element ( 56 ) and allocates a nominal value to the rotational speed regulator and to the displacement volume regulator ( 20 ) in a software assisted manner, wherein the electronic control unit ( 108 ) or its software includes a base-load routine ( 118 , 118 ′) for adjusting a defined base-load rotational speed of the drive motor ( 50 ) in the case of coupling to the hydraulic pump ( 6 ), wherein the base load rotational speed remains at a constant rotational speed below a predetermined maximum rotational speed over a predetermined adjustment range of the final control element ( 56 ) and wherein when the base load rotational speed is at the constant rotational speed the adjustment value (F) of the final control element ( 56 ) provides an intended value input for the displacement volume (V) of the hydraulic pump ( 6 ).