Exhaust gas re-circulation arrangement

• US 6,216,459 B1
• Filed: 12/10/1999
• Issued: 04/17/2001
• Est. Priority Date: 12/11/1998
• Status: Expired due to Fees

• Current Assignee: Erwin Schmidt
• Original Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Inventors: Sumser, Siegfried, Schmidt, Erwin, Finger, Helmut, Daudel, Helmut
• Primary Examiner(s): KOCZO JR, MICHAEL
• Application Number:
  US09/459,243
• Time in Patent Office: 494 Days
• Field of Search: 606/02, 606/052, 415/158
• US Class Current: 60/605.2
• CPC Class Codes: F02B 37/007 with exhaust-driven pumps arranged in parallel , e.g. at least one pump supplying alternatively
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/183 Arrangements of bypass valves or actuators therefor
• CPC Class Codes: F02C 3/32 Inducing air flow by fluid jet, e.g. ejector action
• CPC Class Codes: F02C 3/34 with recycling of part of the working fluid, i.e. semi-closed cycles with combustion products in the closed part of the cycle
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F02D 9/06 Exhaust brakes
• CPC Class Codes: F02M 26/05 High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the 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 26/25 with coolers having bypasses
• CPC Class Codes: F02M 26/34 with compressors, turbines or the like in the recirculation passage
• CPC Class Codes: F02M 26/38 with two or more EGR valves disposed in parallel
• CPC Class Codes: F02M 26/42 having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

In an exhaust gas re-circulation arrangement for a supercharged internal combustion engine including an exhaust gas turbocharger with an exhaust gas turbine and a compressor, first and second exhaust pipes extending from the engine separately to the exhaust gas turbine, a charge air duct extending from the compressor to the engine and an exhaust gas recirculation line extending from one of the exhaust pipes upstream of the exhaust gas turbine to the charge air duct downstream of the compressor, the exhaust gas turbine has two turbine inlet flow passages, which provide for different flow volumes and to each of which one of the exhaust pipes is connected and a control arrangement is provided for controlling the exhaust gas flow through the turbine inlet flow passages so as to control the pressure in the exhaust gas re-circulation line to be higher than in the charge air intake duct.

Claims

1. An exhaust gas re-circulation arrangement in a supercharged internal combustion engine comprising:

an exhaust gas turbocharger with an exhaust gas turbine and a compressor, first and second exhaust pipes extending from said engine separately to said exhaust gas turbine, a charge air duct extending from said compressor to said engine, an exhaust gas recirculation line extending from one of said exhaust pipes upstream of said exhaust gas turbine to said charge air duct downstream of said compressor, said exhaust gas turbine having two inlet flow passages, one connected to said first and the other to said second exhaust pipe and including means for causing different exhaust gas flow volumes to pass through said inlet flow passages, said turbine further having a variable geometry for changing the relative flow volumes to pass through said inlet flow passages, and a control arrangement for controlling the exhaust gas flows to provide a pressure in said exhaust gas re-circulation line, which is higher than the pressure of the charge air in said charge air duct downstream of said compressor.

2. An exhaust gas re-circulation arrangement according to claim 1, wherein, in order to provide for different exhaust gas flow volumes to pass through the two inlet flow passages, said inlet flow passages are asymmetrical, one having a smaller flow cross-section than the other.

3. An exhaust gas re-circulation arrangement according to claim 1, wherein, in order to provide for different exhaust gas flow volumes to pass through the two inlet flow passages, at least one of said inlet flow passages includes at least one flow restriction.

4. An exhaust gas re-circulation arrangement according to claim 1, wherein at least one of said inlet flow passages includes a variable guide vane structure for achieving said variable geometry of said exhaust gas turbine.

5. An exhaust gas re-circulation arrangement according to claim 3, wherein said flow restriction comprises a variable guide vane structure.

6. An exhaust gas re-circulation arrangement according to claim 1, wherein a flow control device is connected to said exhaust pipe for selectively supplying exhaust gas from the exhaust pipe leading to one of said turbine inlet flow passages to the exhaust pipe leading to the other inlet flow passage or to the turbine exhaust.

7. An exhaust gas re-circulation arrangement according to claim 1, wherein said charge air duct includes a flow control device, which is connected to the one exhaust pipe.

8. An exhaust gas re-circulation arrangement according to claim 7, wherein said flow control device is a variable ejector.

9. An exhaust gas re-circulation arrangement according to claim 1, wherein said adjustable guide vane structure comprises an axial slide member.

10. An exhaust gas re-circulation arrangement according to claim 1, wherein said exhaust gas turbocharger includes a supplemental compressor for compressing exhaust gas for recirculation to said charge air intake duct.

11. An exhaust gas re-circulation arrangement according to claim 10, wherein said exhaust gas turbocharger includes a shaft on which all turbine, said compressor and said supplemental compressor are disposed.

12. An exhaust gas re-circulation arrangement according to claim 1, wherein said arrangement includes two of said turbochargers arranged in parallel.

13. An exhaust gas re-circulation arrangement according to claim 1, wherein said exhaust gas re-circulation line includes a flutter valve.