Fuel-supply system for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10309335-B2
Application number	US-201515119211-A
Country	US
Kind code	B2
Filing date	Aug 17, 2015
Priority date	Oct 14, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

The present invention relates to a method for operating a fuel supply system for an internal combustion engine, and to a corresponding device. The fuel supply system of an internal combustion engine may include: an outlet of a high-pressure pump coupled to a pressure-limiting valve and a high-pressure fluid accumulator. The method may include, when the internal combustion engine is set into a deactivated state, actuating the high-pressure pump such that, at the outlet side of the high-pressure pump, a pressure is increased such that the pressure-limiting valve is opened.

First claim

What is claimed is:

1. A method for operating a fuel supply system of an internal combustion engine, wherein the fuel supply system includes a pump having an outlet coupled to a high-pressure region including a fluid accumulator, wherein a normal operating pressure of the high-pressure region is between 200 bar and 350 bar, and a pressure-limiting valve having an inlet coupled to the high-pressure region including the fluid accumulator, the method comprising:
when the internal combustion engine is set into a deactivated state, actuating the pump such that, at the outlet side of the pump, a pressure is increased in the high-pressure region including the fluid accumulator to a sufficient extent that the pressure-limiting valve is opened by the pressure in the high-pressure region acting on the inlet of the pressure-limiting valve; and
monitoring a pressure at the outlet of the pump and ceasing actuation of the pump when the pressure exceeds a predefined opening threshold of the pressure-limiting valve;
wherein the pressure limiting valve has an opening pressure less than 90 bar above the normal operating pressure of the high-pressure region and a closure threshold between 50 bar and 150 bar.

2. The method as claimed in claim 1 , wherein the pressure-limiting valve comprises a direct-acting safety valve.

3. The method as claimed claim 1 , wherein the pressure-limiting valve connects the outlet of the pump to a low-pressure region of the fuel supply system at the inlet side of the pump.

4. The method as claimed in claim 1 , wherein the pressure-limiting valve connects the outlet side of the high-pressure pump to a stroke chamber of the pump.

5. The method as claimed in claim 1 , wherein a predefined closure threshold of the pressure-limiting valve is between 90 bar and 150 bar.

6. The method as claimed in claim 1 , wherein the fuel supply system includes a sensor generating a measurement signal representative of the pressure at the outlet side of the pump.

7. A fuel supply system of an internal combustion engine, the fuel supply system comprising:
a pump having an outlet coupled to a high-pressure region with a normal operating pressure in the high-pressure region between 200 bar and 350 bar;
a fluid accumulator arranged in the high-pressure region coupled to the outlet of the pump;
a pressure-limiting valve having an inlet coupled to an outlet of the pump and coupled to the high-pressure region including the fluid accumulator;
a sensor measuring a pressure at the outlet of the pump; and
wherein actuation of the pump continues after the internal combustion engine has been deactivated until the sensor measures a pressure at the outlet side of the pump exceeding a predetermined opening value of the pressure-limiting valve;
wherein the pressure limiting valve has an opening pressure less than 90 bar above the normal operating pressure of the high-pressure region and a closure threshold of between 50bar and 150 bar.

8. The fuel system as claimed in claim 7 , wherein the pressure-limiting valve comprises a direct-acting safety valve.

9. The fuel system as claimed in claim 7 , wherein the pressure-limiting valve connects the outlet of the pump to a relatively lower pressure region of the fuel supply system at the inlet side of the pump.

10. The fuel system as claimed in claim 7 , wherein the pressure-limiting valve connects the outlet side of the high-pressure pump to a stroke chamber of the pump.

11. The fuel system as claimed in claim 7 , wherein a predefined closure threshold of the pressure-limiting valve is between 90 bar and 150 bar.

12. The fuel system as claimed in claim 7 , wherein actuation of the pump is ended based at least in part on the measurement signal of the sensor.

Assignees

• Continental Automotive Gmbh

Inventors

• Klesse Christoph
• Riedel Thomas
• Riepl Hans
• Ritsch Tobias
• Wirkowski Michael

Classifications

• F02D41/3845 Primary

  by controlling the flow into the common rail, e.g. the amount of fuel pumped · CPC title

• F02D41/3863

  by controlling the flow out of the common rail, e.g. using pressure relief valves · CPC title

• F02M63/0225

  Fuel-injection apparatus having a common rail feeding several injectors (F02M63/0003 takes precedence); Means for varying pressure in common rails; Pumps feeding common rails · CPC title

• F02D41/042 Primary

  for stopping the engine · CPC title

• F02D2250/02

  Fuel evaporation in fuel rails, e.g. in common rails · CPC title