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

Patent metadata

Field	Value
Publication number	US-11143211-B1
Application number	US-202117162296-A
Country	US
Kind code	B1
Filing date	Jan 29, 2021
Priority date	Jan 29, 2021
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A system for controlling hydraulic fluid flow within a work vehicle includes a pilot conduit configured to receive a pilot flow of hydraulic fluid from a fluid supply conduit such that the operation of a compensator valve is controlled based on a pressure of the pilot flow within the pilot conduit. Furthermore, a pilot conduit valve is configured to adjust the pressure of the pilot flow within the pilot conduit. In addition, the system includes a load sense conduit configured to receive a bleed flow of the hydraulic from the fluid supply conduit such that the operation of the pump is controlled based on a pressure of the bleed flow within the load sense conduit. Moreover, a load sense valve is configured to adjust the pressure of the bleed flow within the load sense conduit.

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 load sense conduit fluidly coupled to the fluid supply conduit downstream of the flow control valve and the compensator valve, the load sense conduit configured to receive a bleed flow of the hydraulic fluid from the fluid supply conduit such that an operation of the pump is controlled based on a pressure of the bleed flow within the load sense conduit; and
a load sense valve fluidly coupled to the load sense conduit, the load sense valve configured to adjust the pressure of the bleed flow within the load sense conduit.

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

3. 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.

4. The system of claim 1 , further comprising:
a pump compensator fluidly coupled to the load sense conduit such that the pump compensator receives the bleed flow from the load sense conduit, the pump compensator being configured to control the operation of the pump based on the pressure of the received bleed flow.

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

6. The system of claim 1 , wherein the load sense valve comprises a pilot-operated valve.

7. 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 conduit valve.

8. The system of claim 1 , wherein the bleed flow is retained within the load sense conduit when the pressure of the bleed flow is adjusted by the load sense valve.

9. The system of claim 1 , further comprising:
a computing system to control an operation of the pilot conduit valve and an operation of the load sense valve.

10. The system of claim 9 , further comprising:
a first pressure sensor configured to capture data indicative of a first pressure of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve; and
a second pressure sensor configured to capture data indicative of a second pressure of the hydraulic fluid being discharged by the pump,
wherein the first and second pressure sensors are communicatively coupled to the computing system.

11. The system of claim 10 , wherein the computing system is further configured to:
determine the first and second pressures based on the data captured by the first and second pressure sensors, respectively; and
control the operation of the pilot conduit valve and the operation of the load sense valve based on the determined first and second pressures.

12. The system of claim 11 , further comprising:
a first flow sensor configured to capture data indicative of a first flow rate of the hydraulic fluid within the fluid supply conduit downstream of the flow control valve; and
a second flow sensor configured to capture data indicative of a second flow rate of the hydraulic fluid being discharged by the pump,
wherein the first and second flow sensors are communicatively coupled to the pump.

13. The system of claim 12 , wherein the computing system is further configured to:
determine the first and second flow rates based on the data captured by the first and second pressure sensors, respectively; and
control the operation of the pilot conduit valve and the operation of the load sense valve based on the determined first and second flow rates.

14. A system for controlling hydraulic fluid flow within a work vehicle, the system comprising:
a first hydraulic load;
a second hydraulic load in parallel with the first hydraulic load;
a pump configured to supply hydraulic fluid to the first hydraulic load via a first fluid supply conduit and the second hydraulic load via a second fluid supply conduit;
a first flow control valve fluidly coupled to the first fluid supply conduit upstream of the first hydraulic load;
a second flow control valve fluidly coupled to the second fluid supply conduit upstream of the second hydraulic load;
a first compensator valve fluidly coupled to the first fluid supply conduit upstream of the first hydraulic load;
a second compensator valve fluidly coupled to the second fluid supply conduit upstream of the second hydraulic load;
a first pilot conduit fluidly coupled to the first fluid supply conduit downstream of the first flow control valve and the first compensator valve, the first pilot conduit configured to receive a pilot flow of the hydraulic fluid from the first fluid supply conduit such that an operation of the first compensator valve is controlled based on a pressure of the pilot flow within the first pilot conduit;
a second pilot conduit fluidly coupled to the second fluid supply conduit downstream of the second flow control valve and the second compensator valve, the second pilot conduit configured to receive a pilot flow of the hydraulic fluid from the second fluid supply conduit such that an operation of the second compensator valve is controlled based on a pressure of the pilot flow within the second pilot conduit;
a pilot conduit valve fluidly coupled to one of the first or second pilot conduits, the pilot conduit valve configured to adjust the pressure of the pilot flow within the one of the first or second pilot conduits;
a load sense conduit fluidly coupled to the first and second fluid supply conduits downstream of the first and second flow control valves, respectively, the load sense conduit configured to receive a bleed flow of the hydraulic from the first or second fluid supply conduit in which the hydraulic fluid is at a greater pressure such that an operation of the pump is controlled based on a pressure of the bleed flow within the load sense conduit; and
a load sense valve fluidly coupled to the load sense conduit, the load sense valve configured to adjust the pressure of the bleed flow within the load sense conduit.

15. The system of claim 14 , wherein the pilot conduit valve corresponds to a first pilot conduit valve, the system further comprising:
a second pilot conduit valve fluidly coupled to another of the first or second pilot conduits, the second pilot conduit valve configured to adjust the pressure of the pilot flow within the other of the first or second pilot conduits.

16. The system of claim 15 , further comprising:
a computing system to control an operation of the first and second pilot conduit valves and an operation of the load sense valve.

17. The system of claim 16 , further comprising:
a first pressure sensor configured to capture data indicative of a first pressure of the hydraulic fl

Assignees

• Cnh Ind America Llc

Inventors

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

Classifications

• F15B2211/7052

  Single-acting output members · CPC title

• F15B2211/67

  Methods for controlling pilot pressure · CPC title

• F15B2211/6355

  having valve means · CPC title

• F15B2211/6326

  the flow rate being an output member flow rate · CPC title

• F15B2211/6323

  the flow rate being a pressure source flow rate · CPC title