INDIVIDUAL ACCUMULATOR, HIGH-PRESSURE COMPONENT, AND COMMON RAIL FUEL INJECTION SYSTEM, AS WELL AS AN INTERNAL COMBUSTION ENGINE, ELECTRONIC CONTROL UNIT, AND METHOD FOR THE OPEN-LOOP AND/OR CLOSED-LOOP CONTROL OF AN INTERNAL COMBUSTION ENGINE

• US 20100280743A1
• Filed: 05/03/2010
• Published: 11/04/2010
• Est. Priority Date: 05/04/2009
• Status: Abandoned Application

• Current Assignee: MTU Friedrichshafen GmbH (Rolls-Royce Holdings Plc)
• Original Assignee: MTU Friedrichshafen GmbH (Rolls-Royce Holdings Plc)
• Inventors: REMELE, Joerg, SPEETZEN, Ralf, SCHMIDT, Guenther, GERBETH, Robby, WALDER, Michael, HEHLE, Marc, Willmann, Michael
• Application Number:
  US12/772,713
• Publication Number:
  US 20100280743A1
• Time in Patent Office: Days
• US Class Current: 701/103
• CPC Class Codes: F02D 2041/2055 with means for determining actual opening or closing time
• CPC Class Codes: F02D 2200/0602 Fuel pressure
• CPC Class Codes: F02D 41/3845 by controlling the flow into the common rail, e.g. the amount of fuel pumped
• CPC Class Codes: F02D 41/402 Multiple injections
• CPC Class Codes: F02M 2200/40 Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
• CPC Class Codes: F02M 57/005 the devices being sensors
• CPC Class Codes: F02M 63/0225 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 Class Codes: G01L 23/18 by resistance strain gauges
• CPC Class Codes: G01L 23/24 specially adapted for measuring pressure in inlet or exhaust ducts of internal-combustion engines
• CPC Class Codes: G01L 9/0002 using variations in ohmic resistance G01L9/0051 takes precedence

Abstract

An individual accumulator for a high-pressure component of a high-pressure fuel guide of a common rail fuel injection system. The individual accumulator is equipped with a pressure sensor, and the common rail fuel injection system is equipped with a source of high pressure and a fuel injector, which has a fluid connection with this source of high pressure via the high-pressure fuel guide, for injecting the fuel into a working chamber of an internal combustion engine. The pressure sensor is designed as a strain sensor.

Claims

1. An individual accumulator for a high-pressure component of a high-pressure fuel guide of a common rail fuel injection system equipped with a source of high pressure and a fuel injector, which has a fluid connection with the source of high pressure via the high-pressure fuel guide, for injecting fuel into a working chamber of an internal combustion engine, wherein the individual accumulator comprises a pressure sensor designed as a strain sensor.

2. The individual accumulator in accordance with claim 1, wherein the strain sensor is a strain gage.

3. The individual accumulator in accordance with claim 1, comprising a housing having an outer wall, the strain sensor being mounted on an outer side of the wall of the housing.

5. A high-pressure component of a high-pressure fuel guide of a common rail fuel injection system with an individual accumulator according to claim 1, wherein the high-pressure component is an injector.

6. The high-pressure component in accordance with claim 5, wherein the individual accumulator is connected to or integrated in a high-pressure channel within the injector.

7. The high-pressure component in accordance with claim 5, wherein the individual accumulator is arranged at a distal end of the injector opposite a tip of the injector.

8. The high-pressure component in accordance with claim 5, wherein the individual accumulator is arranged in a body of the injector that is located a distance from a tip of the injector, which body is spaced a distance from a distal end of the injector opposite the injector tip.

9. The high-pressure component in accordance with claim 5, and further comprising a hydraulic resistance arranged immediately upstream of the individual accumulator for integration in the high-pressure fuel guide.

4. A high-pressure component of a high-pressure fuel guide of a common rail fuel injection system having a source of high pressure, a fuel injector and an individual accumulator having a pressure sensor designed as a strain sensor, wherein the high-pressure component is configured for connection to or integration in a high-pressure line outside the injector.

10. The high-pressure component in accordance with claim 4, wherein the strain sensor is a strain gage.

11. The high-pressure component in accordance with claim 4, wherein the strain sensor is mounted on an outer side of a wall of the individual accumulator.

12. The high-pressure component in accordance with claim 4, wherein the high-pressure fuel guide has a high-pressure connection that opens directly into the individual accumulator.

13. The high-pressure component in accordance with claim 12, wherein a volume of the individual accumulator together with a volume of the high-pressure connection of the high-pressure guide forms an approximately T-shaped or approximately L-shaped cross section at the individual accumulator.

14. The high-pressure component in accordance with claim 4, wherein a diameter of the individual accumulator determined transversely to an axial direction of conveyance of the fuel is greater than a transverse diameter of the high-pressure component upstream of the individual accumulator determined transversely to an axial direction of conveyance of the fuel.

15. The high-pressure component in accordance with claim 4, wherein the high-pressure component has a diameter with a course along an axial direction of conveyance of the fuel that has a throat upstream of the individual accumulator.

16. A common rail fuel injection system comprising:

a high-pressure source;

a fuel injector; and

a high-pressure guide for placing the fuel injector in fluid connection with the high pressure source, for injecting fuel into a working chamber of an internal combustion engine, wherein the high-pressure guide has a high-pressure component and/or individual accumulator with a pressure sensor, the pressure sensor being designed as a strain sensor.

17. The common rail fuel injection system in accordance with claim 16, wherein the strain sensor is a strain gage.

18. The common rail fuel injection system in accordance with claim 16, wherein the high-pressure guide has a hydraulic resistance upstream of the individual accumulator that is greater than a hydraulic resistance of the high-pressure guide after an outlet of the high-pressure source.

19. The common rail fuel injection system in accordance with claim 16, wherein in the high-pressure guide, only the individual accumulator is provided with a pressure sensor.

20. The common rail fuel injection system in accordance with claim 19, wherein the pressure sensor is a strain gage.

21. The common rail fuel injection system in accordance with claim 16, wherein the high-pressure source also has a strain sensor.

22. An internal combustion engine, comprising:

a common rail fuel injection system, having a high-pressure source, a fuel injector, and a high-pressure guide for placing the fuel injector in fluid connection with the high pressure source, for injecting fuel into a working chamber of the internal combustion engine, wherein the high-pressure guide has a high-pressure component and/or individual accumulator with a pressure sensor the pressure sensor being designed as a strain sensor; and

an electronic control unit for open-loop or closed-loop control of the internal combustion engine, the electronic control unit being operative to process a measured quantity of a strain sensor for the pressure of the individual accumulator.

23. The internal combustion engine in accordance with claim 22, wherein the electronic control unit has a signal input connected with a signal output of the strain sensor.

24. An electronic control unit for the open-loop and/or closed-loop control of an internal combustion engine having a common rail fuel injection system including a high-pressure source, a fuel injector, and a high-pressure guide for placing the fuel injector in fluid connection with the high pressure source, for injecting fuel into a working chamber of the internal combustion engine, wherein the high-pressure guide has a high-pressure component and/or individual accumulator with a pressure sensor the pressure sensor being designed as a strain sensor, wherein the electronic control unit is operative to process a measured quantity of a strain sensor for the pressure of the individual accumulator.

25. The electronic control unit in accordance with claim 24, wherein the electronic control unit has a signal input connectable with a signal output of the strain sensor.

26. A method for open-loop and/or closed-loop control of an internal combustion engine with a common rail fuel injection system having a high-pressure source, a fuel injector, and a high-pressure guide for placing the fuel injector in fluid connection with the high pressure source, for injecting fuel into a working chamber of the internal combustion engine, wherein the high-pressure guide has a high-pressure component and/or individual accumulator with a pressure sensor, the pressure sensor being designed as a strain sensor, the method comprising the steps of:

detecting and storing a pressure of the individual accumulator during a measurement interval; and

interpreting a significant change in the pressure as a start of injection or an end of injection for the control system, wherein the pressure of the individual accumulator is measured by a pressure sensor formed as a strain sensor on the individual accumulator the steps being carried out by an electronic control unit.

27. The method in accordance with claim 26 including supplying a measured quantity for the pressure of the individual accumulator as a signal at a signal output at the strain sensor, and

determining a first measured pressure value before the internal combustion engine is started;

determining a second measured pressure value in a static state of the internal combustion engine; and

relating a third measured pressure value to the first and/or the second measured pressure value.

28. The method in accordance with claim 26, further including measuring and relating the pressure of the high-pressure source to the pressure of the individual accumulator.

29. The method in accordance with claim 27, including making the pressure of the individual accumulator available to the control system instead of the pressure of the high-pressure source.

30. The method in accordance with claim 26, including measuring the pressure of the individual accumulator by the strain sensor on the individual accumulator for the open-loop and/or closed-loop control of the internal combustion engine with a common rail fuel injection system during the course of a main injection and/or preinjection and/or post-injection.