Laser welded automotive diesel exhaust HC dosing valve

• US 20080105841A1
• Filed: 06/11/2007
• Published: 05/08/2008
• Est. Priority Date: 11/08/2006
• Status: Active Grant

• Current Assignee: Vitesco Technologies USA, LLC (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Siemens VDO Automotive Corporation (Siemens AG)
• Inventors: Bugos, Stephen C., Stockmaster, David, Hornby, Michael J., Sayar, Hamid
• Granted Patent: US 9,151,201 B2
• Time in Patent Office: Days
• US Class Current: 251/129.01
• CPC Class Codes: F01N 13/009 having two or more separate purifying devices arranged in series
• CPC Class Codes: F01N 13/0093 the purifying devices are of the same type
• CPC Class Codes: F01N 13/0097 the purifying devices are arranged in a single housing
• CPC Class Codes: F01N 13/1838 characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
• CPC Class Codes: F01N 3/0253 adding fuel to exhaust gases
• CPC Class Codes: F01N 3/103 Oxidation catalysts for HC and CO only
• CPC Class Codes: F01N 3/106 Auxiliary oxidation catalysts
• CPC Class Codes: F01N 3/2033 using a fuel burner or introducing fuel into exhaust duct
• CPC Class Codes: F02B 37/22 by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits F02B37/24 takes precedence
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

Dosing structure (30) supplies diesel fuel to an exhaust passage of a diesel system. The dosing structure includes an electrically operated control valve (31). An inlet tube (45) is coupled with an inlet of the control valve. A first welded joint (6) is between the inlet tube and the control valve. The inlet tube is constructed and arranged to be coupled to a supply of diesel fuel for feeding fuel to the control valve. A dosing valve (32) is constructed and arranged to receive fuel from the control valve and deliver the fuel to the exhaust passage. An extension tube (33) is fluidly coupled between the control valve and the dosing valve to space the control valve from the dosing valve. A second welded joint (62) is between the extension tube and the control valve and a third welded joint (64) is between the extension tube and the dosing valve.

Claims

1. Dosing structure for supplying diesel fuel to an exhaust passage of a diesel system, the dosing structure comprising:

an electrically operated control valve,

an inlet tube coupled with an inlet of the control valve,

a first welded joint between the inlet tube and the control valve, the inlet tube being constructed and arranged to be coupled to a supply of diesel fuel for feeding fuel to the control valve,

a dosing valve constructed and arranged to receive fuel from the control valve and deliver the fuel to the exhaust passage,

an extension tube fluidly coupled between the control valve and the dosing valve to space the control valve from the dosing valve and to permit fuel to be delivered from the control valve, through the extension tube, and to the dosing valve,

a second welded joint between the extension tube and the control valve, and

a third welded joint between the extension tube and the dosing valve.

2. The structure of claim 1, wherein each of the first, second and third welded joints is a laser welded joint.

3. The structure of claim 1, wherein the control valve is a fuel injector.

4. The structure of claim 1, wherein the dosing valve is a poppet valve.

5. The structure of claim 4, wherein the poppet valve is composed entirely of metal.

6. The structure of claim 5, wherein the poppet valve is constructed and arranged to be coupled to an exhaust manifold.

7. The structure of claim 1, wherein the extension tube is a metal tube.

8. The structure of claim 1, wherein the extension tube is a flexible tube.

9. The structure of claim 8, wherein the flexible tube is fiberglass braided Teflon hose.

10. The structure of claim 1, in combination with a control unit electronically controlling operation of the control valve.

11. The structure of claim 4 wherein the poppet valve has a valve member constructed and arranged, when in an opened position, to extend outwardly from a body of the poppet valve.

12. The structure of claim 1, further comprising a bracket associated with the control valve for mounting the control valve.

13. The structure of claim 1, wherein the bracket includes a pair of clips, one of the clips being coupled to the inlet tube and another clip being coupled to the control valve near the extension tube.

14. The structure of claim 1, wherein the dosing valve has a cap that is constructed and arranged to be in threaded engagement with a portion of the exhaust passage.

15. A method of providing a diesel dosing structure for supplying diesel fuel to an exhaust passage of a diesel system to reduce particulates in the exhaust passage, the method including the steps of:

providing a dosing valve coupled to an exhaust passage of a diesel system and constructed and arranged to inject fuel into the exhaust passage,

providing an electrically operated control valve associated with the dosing valve to supply diesel fuel to the dosing valve,

welding a first end of an extension tube to the control valve and welding a second end of the extension tube to the dosing valve to space the control valve from the dosing valve such that heat generated in the exhaust passage is less at the control valve than at the dosing valve,

welding an inlet tube to an inlet of the control valve, and

providing a source of diesel fuel to the inlet tube and thus to the control valve so that the control valve can control an amount of diesel fuel through the extension tube to the dosing valve for injection into the exhaust passage.

16. The method of claim 15, wherein the welding steps including laser welding.

17. The method of claim 15, wherein the step of providing the dosing valve includes providing a poppet valve as the dosing valve.

18. The method of claim 15, wherein the step of providing the control valve includes providing a fuel injector as the control valve.