Hydraulic system with servo drive and hydraulic load and control unit for the hydraulic system

A hydraulic system comprising:

• a servo drive composed of an electric motor and a pump;
• a control unit;
• and
• a hydraulic load,
• wherein the control unit is given a target system pressure as a reference variable and an actual system pressure of the hydraulic load as the control variable,
• wherein the control unit specifies to the electric motor an electric torque as a variable,
• wherein the electric motor transmits the motor torque to the pump, whereby the pump generates a volume flow at the hydraulic load, by which the actual system pressure is generated, and
• wherein a mechanical load torque sets in at the electric motor,
• wherein a limiting unit is connected to the control unit,
• wherein the limiting unit limits the motor torque transmitted by the control unit to the electric motor by using a system variable of the hydraulic system, and
• wherein a calculation unit is on hand, which, by using the system variable, calculates an estimated load torque and transmits it to the limiting unit, which limits the motor torque as a function of the estimated load torque.