Fuel injection system with pressure-controlled bleed function

Patent metadata

Field	Value
Publication number	US-9541045-B2
Application number	US-201113809895-A
Country	US
Kind code	B2
Filing date	Jun 15, 2011
Priority date	Jul 14, 2010
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A fuel injection system with a high-pressure fuel injection pomp is provided for pressurizing fuel and delivering it for injection into an internal combustion engine. The system and the high-pressure fuel injection pump have an inlet, a return port, at least one plunger, a suction, channel positioned between the inlet and plunger, and a bleed valve connectively arranged at the suction channel of the high-pressure fuel injection pump, A selector valve is provided between the inlet, and return port.

First claim

The invention claimed is:

1. A high-pressure fuel injection system for pressurizing fuel and delivering it fur injection into an internal combustion engine, the system comprising a high-pressure fuel injection pump with an inlet, at least one plunger, a suction channel positioned between the inlet and plunger, the system further comprising a return port, and a bleed valve connectively arranged at the suction channel of the high-pressure fuel injection pump, wherein a selector valve is provided between the inlet and return port, and an inlet metering valve is connectively arranged between the inlet and the suction channel, the bleed valve being connectively arranged between the inlet metering valve and the plunger, an outlet of the selector valve being in fluid communication with an outlet of the bleed valve.

2. A fuel injection system according to claim 1 , wherein the bleed valve is connectively arranged between the suction channel and the return port.

3. A fuel injection system according to claim 1 . wherein the selector valve is able to control hydraulic flow restriction between the inlet and return port.

4. A fuel injection system according to claim 1 , wherein the selector valve is able to open or close the hydraulic connection between the inlet and return port.

5. A fuel injection system according to claim 1 , wherein the selector valve is controlled by pressure developed by the plunger.

6. A fuel injection system according to claim 5 , wherein the selector valve is fully closed when the pressure developed by the plunger is below a predetermined level, and is partially or fully open when the pressure is at or above the predetermined level.

7. A fuel injection system according to claim 1 , wherein the selector valve is electronically controlled.

8. A fuel injection system according to claim 1 , wherein the bleed valve is controlled by pressure developed by the plunger.

9. A fuel injection system according to claim 1 , wherein the bleed valve is fully open when the pressure developed by the plunger is below a predetermined level, and is partially or fully closed when the pressure is at or above the predetermined level.

10. A fuel injection system according to claim 1 , wherein the bleed valve is electronically controlled.

11. A fuel injection system according to claim 1 , wherein the bleed valve is a non-re urn valve connected by its inlet to the suction channel.

12. A fuel injection system according to claim 1 , wherein an hydraulic flow restrictor is installed between the inlet and return port.

13. A fuel injection system according to claim 1 , wherein an hydraulic flow restrictor is installed downstream of the return port.

14. A fuel injection system according to claim 1 , wherein the bleed valve is in constant fluid communication with the suction channel.

15. A fuel injection system according to claim 1 , wherein the bleed valve is directly connected to the suction channel.

Assignees

• Yudanov Sergi
• Volvo Lastvagnar Ab

Inventors

• Yudanov Sergi

Classifications

• F02M37/0052

  Details on the fuel return circuit; Arrangement of pressure regulators · CPC title

• F02M63/0052

  with means for adjusting the opening pressure, e.g. electrically controlled · CPC title

• F02M21/0245

  High pressure fuel supply systems; Rails; Pumps; Arrangement of valves · CPC title

• F02M59/34

  by throttling of passages to pumping elements or of overflow passages {, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment} · CPC title

• F02M37/0029 Primary

  Pressure regulator in the low pressure fuel system (pressure regulator in low-pressure injection apparatus F02M69/54) · CPC title