Electronic control unit, hydraulic system, and method for controlling a hydraulic system

A method for controlling a hydraulic system, the hydraulic system comprising a pump drivingly coupled to a motor, the pump configured to provide a supply pressure in a supply line of the hydraulic system,

• comprising:
• receiving, by an electronic control unit, a load sensing signal corresponding to a sensed load measure of the hydraulic system, wherein the sensed load measure is a load sensing pressure;
• determining, by the electronic control unit and based on the load sensing pressure and a predetermined pump margin of the pump, a target torque parameter for the motor, wherein the predetermined pump margin is a pressure differential between the supply pressure and the load sensing pressure;
• and
• adjusting, by the electronic control unit, the motor based on the target torque parameter;
• wherein determining the target torque parameter comprises determining, via a closed loop controller, a closed-loop target torque parameter based on a current speed of the motor;
• and
• wherein adjusting the motor based on the target torque parameter comprises adjusting a speed of the motor based on the closed-loop target torque parameter.

An electronic control unit for a hydraulic system, the hydraulic system comprising a pump drivingly coupled to a motor, the pump configured to provide a supply pressure in a supply line of the hydraulic system;

• wherein the electronic control unit is configured to:
• receive a load sensing signal corresponding to a sensed load measure of the hydraulic system, wherein the sensed load measure is a load sensing pressure;
• determine, based on the load sensing pressure and a predetermined pump margin, a target torque parameter for the motor, wherein the predetermined pump margin is a pressure differential between the supply pressure and the load sensing pressure;
• and
• adjust the motor based on the target torque parameter;
• and
• wherein the target torque parameter is determined by the equation
• T
• =
• V
• p
• ×
• P
• l
• ⁢
• s
• +
• P
• m
• -
• P
• t
• η
• h
• ⁢
• m
• ,
• wherein T is the target torque parameter, Vp is a displacement volume of the pump, Pis is a load sensing pressure, Pm is the pump margin, Pt is a pressure at an inlet line or suction port of the pump, and ηhm is a hydro-mechanical efficiency of the pump.