Clean gas injector

• US 20060124116A1
• Filed: 12/15/2004
• Published: 06/15/2006
• Est. Priority Date: 12/15/2004
• Status: Abandoned Application

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Bui, Yung T.
• Application Number:
  US11/012,458
• Publication Number:
  US 20060124116A1
• Time in Patent Office: Days
• US Class Current: 123/568.180
• CPC Class Codes: F01N 3/021 by means of filters
• CPC Class Codes: F02B 37/004 with exhaust drives arranged in series
• CPC Class Codes: F02B 37/013 with exhaust-driven pumps arranged in series
• CPC Class Codes: F02M 26/08 for engines having two or more intake charge compressors or exhaust gas turbines, e.g. a turbocharger combined with an additional compressor
• CPC Class Codes: F02M 26/10 having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
• CPC Class Codes: F02M 26/15 in relation to engine exhaust purifying apparatus
• CPC Class Codes: F02M 26/19 Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
• CPC Class Codes: F02M 26/21 with EGR valves located at or near the connection to the intake system
• CPC Class Codes: F02M 26/23 Layout, e.g. schematics
• CPC Class Codes: F02M 26/70 Flap valves; Rotary valves; Sliding valves; Resilient valves
• CPC Class Codes: F02M 35/10118 with variable cross-sections of intake ducts along their length; Venturis; Diffusers
• CPC Class Codes: F02M 35/10157 Supercharged engines
• CPC Class Codes: F02M 35/10222 Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A clean gas induction (CGI) injector having an intake air conduit with inner diameter and defining an intake air flow path, and a CGI conduit defining a clean gas flow path. The CGI conduit disposed within the intake air conduit includes an open end portion having an inner surface and an outer surface. The outer surface, having a substantially less diameter than the inner diameter of the intake air conduit, is formed to restrict the intake air flow.

Claims

1. A clean gas induction (CGI) injector, comprising:

an intake air conduit defining an intake air flow path, the intake air conduit having an inner diameter; and

a CGI conduit defining a clean gas flow path, the CGI conduit being disposed within the intake air conduit, the CGI conduit includes an open end portion having an inner surface and an outer surface, the outer surface having a substantially less diameter than the inner diameter of the intake air conduit and the open end portion being formed to restrict the intake air flow.

2. The injector of claim 1, wherein the CGI conduit includes a bent portion.

3. The injector of claim 2, wherein the CGI conduit includes a turning vane disposed within the bent portion, the turning vane being positioned to divide the clean gas flow into a first flow path and a second flow path.

4. The injector of claim 1, wherein the outer surface of the open end portion has a smooth transition.

5. The injector of claim 4, wherein the smooth transition of the open end portion is substantially a bell mouth shape.

6. The injector of claim 1, wherein the inner surface of the open end portion is formed to have a varying diameter.

7. The injector of claim 1, wherein the inner surface of the open end portion is formed to maintain a constant wall thickness.

8. The injector of claim 1, further including a CGI injector valve positioned in fluid communication with the CGI conduit.

9. The injector of claim 8, wherein the CGI injector valve includes an actuating device connected to the CGI injector valve, a bypass member positioned concentrically with the CGI conduit and a shaft connecting the actuating device and the bypass member.

10. The injector of claim 9, wherein the bypass member is a butterfly valve.

11. An internal combustion engine, the engine includes an engine block defining a plurality of combustion chambers, comprising:

an exhaust air system in fluid communication with the plurality of combustion chambers, the exhaust air system having an exhaust air conduit;

an intake air system in fluid communication with the plurality of combustion chambers, the intake air system having an intake air conduit having a inner diameter defining a intake air flow path, and an intake air compressing device;

a CGI system extending between the exhaust air system and the intake air system, the CGI system is connected to the intake air system upstream of the intake air compressing device, the CGI system includes a CGI injector having a CGI injector valve, an CGI conduit defining a clean gas flow path, the CGI conduit being disposed within the intake air conduit, the CGI conduit includes an open end portion having an inner surface and an outer surface, the outer surface having a substantially less diameter than the inner diameter of the intake air conduit and the open end portion being formed to restrict the intake air flow; and

an ECM operatively coupled to the internal combustion engine.

12. The engine of claim 11, wherein the CGI injector valve includes an actuating device, a bypass member positioned concentrically with the CGI conduit and a shaft connecting the actuating device and the bypass member.

13. The engine of claim 12, wherein the ECM is in communication with the CGI injector valve, the ECM operatively controls the CGI injector valve in response from a signal received from at least one operating parameter of the internal combustion engine to vary the amount to clean gas being introduced into the intake air system.

14. The engine of claim 13, wherein the ECM is operatively coupled to the actuator.

15. The engine of claim 12, wherein the bypass member is a butterfly valve.

16. The engine of claim 11, wherein the CGI conduit includes a bent portion.

17. The engine of claim 16, wherein the CGI conduit includes a turning vane disposed within the bent portion, the turning vane being positioned to divide the clean gas flow into a first flow path and a second flow path.

18. The engine of claim 11, wherein the outer surface of the open end portion has a smooth transition.

19. The engine of claim 18, wherein the smooth transition of the open end portion is substantially a bell mouth shape.

20. The engine of claim 11, wherein the inner surface of the open end portion is formed to have a variable diameter.

21. The engine of claim 11, wherein the inner surface of the open end portion is formed to maintain a constant wall thickness.