System and method for controlling hydraulic fluid flow within a work vehicle

Patent metadata

Field	Value
Publication number	US-11313388-B1
Application number	US-202117162359-A
Country	US
Kind code	B1
Filing date	Jan 29, 2021
Priority date	Jan 29, 2021
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A system for controlling hydraulic fluid flow within a work vehicle includes a pilot conduit fluidly configured to receive a pilot flow of the hydraulic fluid from a fluid supply conduit such that an operation of a compensator valve is controlled based on a pressure of the pilot flow. Furthermore, the system includes a pilot conduit valve configured to adjust the pressure of the pilot flow within the pilot conduit. A computing system is configured to determine the pressure of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve based on the data captured by a pressure sensor. Furthermore, the computing system is configured to control an operation of the pilot conduit valve to selectively adjust the pressure of the pilot flow within the pilot conduit based on the determined pressure.

First claim

The invention claimed is:

1. A system for controlling hydraulic fluid flow within a work vehicle, the system comprising:
a hydraulic load;
a pump configured to supply hydraulic fluid to the hydraulic load via a fluid supply conduit;
a flow control valve fluidly coupled to the fluid supply conduit upstream of the hydraulic load;
a compensator valve fluidly coupled to the fluid supply conduit upstream of the hydraulic load;
a pilot conduit fluidly coupled to the fluid supply conduit downstream of the flow control valve and the compensator valve, the pilot conduit configured to receive a pilot flow of the hydraulic fluid from the fluid supply conduit such that an operation of the compensator valve is controlled based on a pressure of the pilot flow within the pilot conduit;
a pilot conduit valve fluidly coupled to the pilot conduit, the pilot conduit valve configured to adjust the pressure of the pilot flow within the pilot conduit;
a pressure sensor configured to capture data indicative of a pressure of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve;
a flow sensor configured to capture data indicative of a flow rate of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve; and
a computing system communicatively coupled to the pressure sensor and the flow sensor, the computing system configured to:
determine the pressure of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve based on the data captured by the pressure sensor;
determine the flow of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve based on the data captured by the pressure sensor; and
control an operation of the pilot conduit valve to selectively adjust the pressure of the pilot flow within the pilot conduit based on the determined pressure and the determined flow rate.

2. The system of claim 1 , wherein the compensator valve is configured to adjust a pressure drop of the hydraulic fluid across the flow control valve based on the pressure of the pilot flow received from the pilot conduit.

3. The system of claim 2 , wherein, when controlling the operation of the pilot conduit valve, the computing system is configured to control the operation of the pilot conduit valve in a manner that selectively reduces the pressure of the pilot flow received by the compensator valve such that the pressure drop across the compensator valve is selectively reduced.

4. The system of claim 1 , wherein the pilot conduit corresponds to a first pilot conduit and the pilot flow corresponds to a first pilot flow, the system further comprising:
a second pilot conduit fluidly coupled to the fluid supply conduit upstream of the flow control valve, the pilot second conduit configured to receive a second pilot flow of the hydraulic fluid from the fluid supply conduit such that the operation of the compensator valve is controlled based on a pressure of the second pilot flow and the pressure of the first pilot flow.

5. The system of claim 1 , wherein the pressure sensor corresponds to a first pressure sensor and the pressure of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve corresponds to a first pressure, the system further comprising:
a second pressure sensor configured to capture data indicative of a second pressure of the hydraulic fluid being discharged by the pump, the computing system further configured to:
determine the second pressure based on the data captured by the second pressure sensor; and
control the operation of the pilot conduit valve to adjust the pressure of the pilot flow within the pilot conduit based on the determined first and second pressures and the determined flow rate.

6. The system of claim 5 , wherein the flow sensor corresponds to a first flow sensor and the flow rate of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve corresponds to a first flow rate, the system further comprising:
a second flow sensor configured to capture data indicative of a second flow rate of the hydraulic fluid being discharged by the pump, the computing system further configured to:
determine the second flow rate based on the data captured by the second flow sensor; and
control the operation of the pilot conduit valve to adjust the pressure of the pilot flow within the pilot conduit based on the determined first and second pressures and the determined first and second flow rates.

7. The system of claim 1 , wherein the compensator valve is positioned upstream of the flow control valve.

8. The system of claim 1 , wherein the pilot conduit valve comprises a pilot-operated valve.

9. The system of claim 8 , wherein the pilot-operated valve comprises an electronically controlled solenoid.

10. The system of claim 1 , wherein the pilot flow is retained within the pilot conduit when the pressure of the pilot flow is adjusted by the pilot valve.

11. A method for controlling hydraulic fluid flow within a work vehicle, the work vehicle including a pump configured to supply hydraulic fluid to a hydraulic load via a fluid supply conduit, a flow control valve fluidly coupled to the fluid supply conduit upstream of the hydraulic load, a compensator valve fluidly coupled to the fluid supply conduit upstream of the hydraulic load, and a pilot conduit fluidly coupled to the fluid supply conduit and the compensator valve, the pilot conduit configured to receive a pilot flow of the hydraulic fluid from the fluid supply conduit such that an operation of the compensator valve is controlled based on a pressure of the pilot flow within the pilot conduit, the method comprising:
determining, with a computing system, a flow rate of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve based on received flow sensor data;
determining, with the computing system, a pressure of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve based on received pressure sensor data; and
controlling, with the computing system, an operation of a pilot conduit valve fluidly coupled to the pilot conduit in a manner that selectively adjusts the pressure of the pilot flow within the pilot conduit to adjust the operation of the compensator valve based on the determined flow rate and the determined pressure.

12. The method of claim 11 , wherein the compensator valve is configured to adjust a pressure drop across the flow control valve based on the pressure of the pilot flow received from the pilot conduit.

13. The method of claim 11 , wherein controlling the operation of the pilot conduit valve comprises controlling, with the computing system, the operation of the pilot conduit valve in a manner that selectively reduces the pressure of the pilot flow received by the compensator valve such that a pressure drop of the hydraulic fluid across the compensator valve is selectively reduced.

14. The method of claim 11 , wherein the pressure of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve corresponds to a first pressure, the method further comprising:
determining, with the computing system, a second pressure of the hydraulic fluid being discharged by the pump, and
wherein controlling the operation of the pilot conduit valve comprises controlling, with the computing system, the operation of the pilot conduit valve to adjust the pressure of the pilot flow within the pilot conduit based on the determined first and second pressures and the determined flow rate.

15. The method of c

Assignees

• Cnh Ind America Llc

Inventors

• Pintore Francesco
• Fiorati Stefano
• Fox Jason David
• Vacca Andrea
• Tian Xin

Classifications

• E02F9/2296

  Systems with a variable displacement pump · CPC title

• E02F9/2235

  including an electronic controller · CPC title

• E02F9/2228

  including an electronic controller · CPC title

• F15B2211/6309

  the pressure being a pressure source supply pressure · CPC title

• F15B2211/355

  Pilot pressure control · CPC title