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Title: Combustion diagnostic for active engine feedback control

Abstract

This invention detects the crank angle location where combustion switches from premixed to diffusion, referred to as the transition index, and uses that location to define integration limits that measure the portions of heat released during the combustion process that occur during the premixed and diffusion phases. Those integrated premixed and diffusion values are used to develop a metric referred to as the combustion index. The combustion index is defined as the integrated diffusion contribution divided by the integrated premixed contribution. As the EGR rate is increased enough to enter the low temperature combustion regime, PM emissions decrease because more of the combustion process is occurring over the premixed portion of the heat release rate profile and the diffusion portion has been significantly reduced. This information is used to detect when the engine is or is not operating in a low temperature combustion mode and provides that feedback to an engine control algorithm.

Inventors:
 [1];  [1]
  1. Knoxville, TN
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
917188
Patent Number(s):
7,277,790
Application Number:
11/380,019
Assignee:
UT-Battelle, LLC (Oak Ridge, TN)
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Green, Jr., Johney Boyd, Daw, Charles Stuart, and Wagner, Robert Milton. Combustion diagnostic for active engine feedback control. United States: N. p., 2007. Web.
Green, Jr., Johney Boyd, Daw, Charles Stuart, & Wagner, Robert Milton. Combustion diagnostic for active engine feedback control. United States.
Green, Jr., Johney Boyd, Daw, Charles Stuart, and Wagner, Robert Milton. 2007. "Combustion diagnostic for active engine feedback control". United States. https://www.osti.gov/servlets/purl/917188.
@article{osti_917188,
title = {Combustion diagnostic for active engine feedback control},
author = {Green, Jr., Johney Boyd and Daw, Charles Stuart and Wagner, Robert Milton},
abstractNote = {This invention detects the crank angle location where combustion switches from premixed to diffusion, referred to as the transition index, and uses that location to define integration limits that measure the portions of heat released during the combustion process that occur during the premixed and diffusion phases. Those integrated premixed and diffusion values are used to develop a metric referred to as the combustion index. The combustion index is defined as the integrated diffusion contribution divided by the integrated premixed contribution. As the EGR rate is increased enough to enter the low temperature combustion regime, PM emissions decrease because more of the combustion process is occurring over the premixed portion of the heat release rate profile and the diffusion portion has been significantly reduced. This information is used to detect when the engine is or is not operating in a low temperature combustion mode and provides that feedback to an engine control algorithm.},
doi = {},
url = {https://www.osti.gov/biblio/917188}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {10}
}