Techniques for controlling a dedicated EGR engine

Patent metadata

Field	Value
Publication number	US-9631582-B2
Application number	US-201414582895-A
Country	US
Kind code	B2
Filing date	Dec 24, 2014
Priority date	Jun 28, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A system includes an internal combustion engine having a number of cylinders, with at least one of the cylinders plumbed to have a complete recycle of the exhaust gases from the cylinder. The system further includes the completely recycled cylinder having an EGR stroke cycle, and the non-recycled cylinders of the engine having an exhaust stroke cycle. The system includes the EGR stroke cycle being distinct from the exhaust stroke cycle. An amount and composition of the exhaust gases from the recycled cylinder are distinct from the amount and composition of the exhaust gases from the non-recycled cylinders, at least at certain operating conditions of the engine.

First claim

What is claimed is:

1. A system comprising:
an internal combustion engine having a dedicated EGR cylinder;
the dedicated EGR cylinder comprising a direct injector;
a controller structured to interpret a warmup condition, and in response to the warmup condition to provide a warmup operation command; and
the direct injector being responsive to the warmup operation command.

2. The system of claim 1 , wherein the dedicated EGR cylinder is a selectively dedicated EGR cylinder.

3. The system of claim 2 , wherein the selectively dedicated EGR cylinder operates as a dedicated EGR cylinder during the warmup condition.

4. The system of claim 1 , wherein the warmup operation command comprises at least one command selected from the commands consisting of;
a retarded injection timing;
a stratified injection timing;
a predetermined rich fueling amount;
a predetermined injection timing determined to produce a desired amount of one of H 2 unburned HC, and CO.

5. The system of claim 1 , wherein the engine further comprises non-dedicated EGR cylinders, and wherein the non-dedicated EGR cylinders include one of: port fuel injection and not having a direct injector.

6. The system of claim 1 , wherein the engine further comprises non-dedicated EGR cylinders, and wherein the dedicated FOR cylinder operates with a distinct AFR from the non-dedicated EGR cylinders during the warmup condition.

7. The system of claim 1 , wherein the dedicated EGR cylinder further comprises a port fuel injector, and wherein the port fuel injector is not active during the warmup condition.

8. The system of claim 1 , wherein the dedicated EGR cylinder further comprises a port fuel injector, and wherein the direct injector provides an additional amount of fuel beyond fuel provided by the port fuel injector during the warmup condition.

9. The system of claim 8 , wherein an intake of the dedicated EGR cylinder is fluidly isolated from non-dedicated EGR cylinders of the engine.

10. The system of claim 1 , wherein the warmup condition comprises at least one condition selected from the conditions selected from: a cold start condition, a low catalyst temperature conditions, a low engine temperature condition, a low engine coolant temperature condition, and a low engine oil temperature condition.

11. The system of claim 1 , wherein the controller is further structured to provide a transition operation command in response to one of an end of the warmup condition and an approaching end of the warmup condition.

Assignees

• Cummins Inc

Inventors

• Geckler Samuel C
• Gandikota Madhuri
• Subramanian Rajkumar
• Loye Axel Otto Zur

Classifications

• F02D41/064

  at cold start (F02D41/067 takes precedence) · CPC title

• F02D41/3094

  the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder · CPC title

• F02D41/008

  Controlling each cylinder individually · CPC title

• F02M26/22

  with coolers in the recirculation passage · CPC title

• F02D41/3058

  the engine working with a variable number of cycles · CPC title