DEVICE AND METHOD FOR CONTROLLING A HYDRAULIC MACHINE

摘要

The invention relates to a hydraulic machine, in particular to a hydraulic motor with two working lines, from one of which a high pressure line and from the other one a low pressure line is branched off. An electronic control unit and a servo displacement unit are provided to control the displacement of the displacement volume of a drive mechanism of the hydraulic machine, wherein the displacement volume can be determinated by the displacement of a servo piston within the servo displacement unit. For this, the servo piston can be loaded at least on one side via a servo pressure line with hydraulic fluid under servo pressure, wherein the servo pressure level can be adjusted by a control spool arranged moveable within a control valve. For this, hydraulic fluid from the low pressure line or, perhaps, from the high pressure line is guidable via the control valve to the servo pressure line if a suitable control signal is available at a switching valve.

主权项

1. A variable hydraulic motor with two working lines, from one of which a high pressure line and from the other one a low pressure line is branched off, and with a control valve, within which a control spool is arranged movable by means of a first actuator, such that a servo displacement unit can be provided with hydraulic fluid under pressure via a servo pressure line arranged at the output side of the control valve such that the displacement volume of the hydraulic motor is adjustable in a controlled manner, wherein
the inlet side of the control valve is connected to the low pressure line, and in that hydraulic fluid from the low pressure line can be forwarded to the servo pressure line via the control valve.