Constant EGR rate engine and method

• US 7,788,923 B2
• Filed: 02/02/2006
• Issued: 09/07/2010
• Est. Priority Date: 02/02/2006
• Status: Active Grant

• Current Assignee: International Engine Intellectual Property Company, LLC (Volkswagen AG)
• Original Assignee: International Engine Intellectual Property Company, LLC (Volkswagen AG)
• Inventors: Rowells, Robert L.
• Primary Examiner(s): Trieu; Thai Ba
• Application Number:
  US11/345,961
• Publication Number:
  US 20070175215A1
• Time in Patent Office: 1,678 Days
• Field of Search: 606/12, 606/11, 606/051, 60600-603, 606/052, 602/85, 123/562, 123/564
• US Class Current: 60/612
• CPC Class Codes: F01N 13/009 having two or more separate purifying devices arranged in series
• CPC Class Codes: F02B 29/0418 the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface
• CPC Class Codes: F02B 37/04 Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
• CPC Class Codes: F02B 37/16 by bypassing charging air
• 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 37/24 by using pumps or turbines with adjustable guide vanes
• 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 26/23 Layout, e.g. schematics
• CPC Class Codes: F02M 26/34 with compressors, turbines or the like in the recirculation passage
• CPC Class Codes: F02M 26/43 in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An internal combustion engine (100) includes a first exhaust manifold (120), and a second exhaust manifold (118) fluidly connected to the first exhaust manifold (120) through an exhaust valve (122). An exhaust gas recirculation (EGR) cooler (124) constantly fluidly connects the second exhaust manifold (118) with an intake manifold (112). A turbocharger (102) has a turbine (126) in fluid communication with the first exhaust manifold (120), and a compressor (132) in fluid communication with a supercharger (140). A charge air cooler (150) fluidly connects the supercharger (140) with the intake manifold (112).

Claims

1. A method comprising the steps of:

dividing an exhaust flow of an engine into a first portion and a second portion;

passing the first portion through a turbocharger;

recirculating the second portion to an intake system through an exhaust gas recirculation cooler;

compressing intake air in a compressor; and

supercharging intake air in a supercharger,

further comprising the step of mixing the first portion and the second portion when the engine is cold.