Internal combustion engine having dual EGR loops (dedicated EGR loop and low pressure EGR loop) and dual cylinder intake ports

Patent metadata

Field	Value
Publication number	US-9200599-B2
Application number	US-201313862797-A
Country	US
Kind code	B2
Filing date	Apr 15, 2013
Priority date	Apr 15, 2013
Publication date	Dec 1, 2015
Grant date	Dec 1, 2015

Abstract

A dual EGR loop exhaust gas recirculation (EGR) system for an internal combustion engine. The engine has both a dedicated EGR loop and a low pressure EGR loop. This means that one or more engine cylinders is operable as a dedicated EGR cylinder, such that all of its exhaust is recirculated via the dedicated EGR loop. The other cylinders are operable as main cylinders having two intake ports, such that each main cylinder may receive a mixture of fresh air and dedicated EGR through one intake port and a mixture of fresh air and low pressure EGR through the other intake port. A control unit controls this dual loop EGR system to either provide EGR only from the dedicated EGR loop or to also provide additional EGR from the low pressure EGR loop.

First claim

What is claimed is:

1. A method of using exhaust gas recirculation (EGR) to improve combustion efficiency of an internal combustion engine having a number of cylinders, comprising:
operating one or more of the cylinders as dedicated EGR cylinder(s), such that all exhaust from the dedicated EGR cylinders) is recirculated as dedicated EGR, and thereby operating the remaining cylinders as main cylinders;
operating the dedicated EGR cylinder(s) at a different air-fuel ratio than th…

Assignees

• Southwest Res Inst

Inventors

• Gukelberger Raphael
• Gingrich Jess W

Classifications

• F02M25/0727

  Mechanical Engineering · mapped topic

• F02M25/074

  Mechanical Engineering · mapped topic

• F02M25/0707 Primary

  Mechanical Engineering · mapped topic

• F02M25/0749

  Mechanical Engineering · mapped topic

• Y02T10/121

  Cross-Sectional Technologies · mapped topic