# US 12,215,718 B2 · Electronic control unit, hydraulic system, and method for controlling a hydraulic system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,215,718 B2
- Document ID: US12215718B2
- Status: Granted
- Kind: B2
- Application number: 17/823,460
- Filed: 2022-08-30
- Published: 2023-03-02
- Granted: 2025-02-04
- Earliest claimed: 2021-08-31
- Assignees: Dana Motion Systems Italia S.R.L.
- Applicants: Dana Motion Systems Italia S.R.L.
- Inventors: Alessandro Benevelli; Nicola Francesco Musciagna
- Web page: https://patentgrep.com/patent/US12215718B2

## CPC

- F15B 11/165: {for adjusting the pump output or bypass in response to demand}
- E02F 9/207: {of the type electric propulsion units, e.g. electric motors or generators}
- E02F 9/2246: {Control of prime movers, e.g. depending on the hydraulic load of work tools}
- F15B 11/08: with only one servomotor
- F15B 2211/20515: Electric motor
- F15B 2211/20523: Internal combustion engine
- F15B 2211/20538: constant capacity
- F15B 2211/20546: variable capacity
- F15B 2211/253: Pressure margin control, e.g. pump pressure in relation to load pressure
- F15B 2211/605: Load sensing circuits
- F15B 2211/6306: representing a pressure
- F15B 2211/6309: the pressure being a pressure source supply pressure
- F15B 2211/6313: the pressure being a load pressure
- F15B 2211/633: representing a state of the prime mover, e.g. torque or rotational speed
- F15B 2211/6651: Control of the prime mover, e.g. control of the output torque or rotational speed
- F15B 2211/6656: Closed loop control, i.e. control using feedback
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)

## Abstract

The disclosure concerns 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. The electronic control unit is configured to receive a load sensing signal corresponding to a sensed load measure of the hydraulic system; determine, based on the load sensing signal and a predetermined pump margin, a target torque parameter for the motor; and adjust the motor based on the target torque parameter. The disclosure further concerns a hydraulic system and a method for controlling a hydraulic system.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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

### Claim 5 (depends on 3)

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

### Claim 6 (depends on 3)

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.

### Claim 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.

### Claim 8 (depends on 7)

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

### Claim 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, 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.