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

1. 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;

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.

2. The electronic control unit according to claim 1 , further configured to determine the predetermined pump margin, as a variable pump margin, based on a variable fluid flow rate in the supply line and a pre-established relation between the predetermined pump margin and the variable fluid flow rate.

3. A hydraulic system, comprising:

a pump configured to provide a supply pressure in a supply line of the hydraulic system;

a motor drivingly coupled to the pump; and

an electronic control unit according to claim 1 .

4. The hydraulic system according to claim 3 , wherein the pump is a fixed-displacement pump.

5. The hydraulic system according to claim 3 , wherein the motor is an electric motor.

6. The hydraulic system according to claim 3 , further comprising a directional control valve with at least two load supply paths selectively connectable with the supply line and a pressure sensor configured to sense, as the sensed load measure, a pressure in at least one of the at least two load supply paths.

7. 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.

8. The method of claim 7 , wherein the hydraulic system is a working hydraulic system of an off-highway vehicle.

9. 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, V p is a displacement volume of the pump, P is is a load sensing pressure, P m is the pump margin, P t is a pressure at an inlet line or suction port of the pump, and η hm is a hydro-mechanical efficiency of the pump.