Method with a hydraulic pressure medium supply arrangement, and hydraulic pressure medium supply arrangement

A method with a hydraulic pressure medium supply arrangement for an open hydraulic circuit having a hydraulic machine, with an adjusting mechanism, which comprises an adjustment cylinder with an adjustment piston for adjusting a displacement volume or pivot angle of the hydraulic machine and an electrically proportionally controllable valve, via which an inflow into and/or an outflow from a control chamber, delimited by the adjustment piston, of the adjustment cylinder can be controlled for adjustment, and with an electronic control unit for controlling the valve, the method comprising:

• a) reading a respective actual value and a first setpoint value associated therewith, corresponding to one or more of a displacement volume or pivot angle of the hydraulic machine a working pressure and a torque of the hydraulic machine, into a first external control loop of the control unit;
• b) determining a first manipulated variable from each respective actual value and first setpoint value associated therewith, via the control unit;
• c) determining a setpoint adjustment speed as a function of at least one first manipulated variable, via the control unit;
• d) reading the respective actual value and a second setpoint value associated therewith, corresponding to one or more of the displacement volume or pivot angle, the working pressure and the torque;
• e) determining a second manipulated variable from each respective actual value and the associated second setpoint value, via the control unit, such that the step of determining the setpoint adjustment speed also takes place as a function of at least one second manipulated variable;
• and
• f) reading an actual adjustment speed and the setpoint adjustment speed determined in step c) into an inner control loop of the control unit subordinate to the first external control loop,
• wherein the inner control loop comprises a control element pilot-controlled via a pilot control value with an I-portion, the manipulated variable of which is limited via a manipulated variable limiter, further comprising:
• limiting the I-portion as a function of the pilot control value and the restriction by the manipulated variable limiter via an I-portion limiter.

A method with a hydraulic pressure medium supply arrangement for an open hydraulic circuit having a hydraulic machine, with an adjusting mechanism, which comprises an adjustment cylinder with an adjustment piston for adjusting a displacement volume or pivot angle of the hydraulic machine and an electrically proportionally controllable valve, via which an inflow into and/or an outflow from a control chamber, delimited by the adjustment piston, of the adjustment cylinder can be controlled for adjustment, and with an electronic control unit for controlling the valve, the method comprising:

• a) reading a respective actual value and a first setpoint value associated therewith, corresponding to a displacement volume or pivot angle of the hydraulic machine, a working pressure and a torque of the hydraulic machine, into a first external control loop of the control unit;
• b) determining a first manipulated variable from each respective actual value and first setpoint value associated therewith, via the control unit;
• c) reading the respective actual value and a second setpoint value associated therewith, corresponding to the displacement volume or pivot angle, the working pressure and the torque, into a second external control loop separate from said first external control loop, wherein each second setpoint value corresponding to each respective actual value is different from each first setpoint value corresponding to the respective actual value;
• d) determining a second manipulated variable from each respective actual value and the associated second setpoint value, via the control unit and,
• e) determining a setpoint adjustment speed as a function of at least one first manipulated variable and at least one second manipulated variable, via the control unit.