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The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine

Olsson, Jan-Ola LU ; Tunestål, Per LU ; Ulfvik, Jonas LU and Johansson, Bengt LU (2003) In SAE Special Publications 2003(1742). p.21-38
Abstract
This paper discusses the effects of cooled EGR on a turbocharged multi-cylinder HCCI engine. A six-cylinder, 12-liter, Scania D12 truck engine is modified for HCCI operation. It is fitted with port fuel injection of ethanol and n-heptane and cylinder pressure sensors for closed-loop combustion control. The effects of EGR are studied in different operating regimes of the engine. During idle, low speed and no load, the focus is on the effects on combustion efficiency, emissions of unburned hydrocarbons and CO. At intermediate load, run without turbocharging to achieve a well-defined experiment, combustion efficiency and emissions from incomplete combustion are still of interest. However the effect on NOdx and the thermodynamic effect on... (More)
This paper discusses the effects of cooled EGR on a turbocharged multi-cylinder HCCI engine. A six-cylinder, 12-liter, Scania D12 truck engine is modified for HCCI operation. It is fitted with port fuel injection of ethanol and n-heptane and cylinder pressure sensors for closed-loop combustion control. The effects of EGR are studied in different operating regimes of the engine. During idle, low speed and no load, the focus is on the effects on combustion efficiency, emissions of unburned hydrocarbons and CO. At intermediate load, run without turbocharging to achieve a well-defined experiment, combustion efficiency and emissions from incomplete combustion are still of interest. However the effect on NOdx and the thermodynamic effect on thermal efficiency, from a different gas composition, are studied as well. At high load and boost pressure the main focus is NOdx emissions and the ability to run high mean effective pressure without exceeding the physical constraints of the engine. In this case the effects of EGR on boost and combustion duration and phasing are of primary interest. It is shown that CO, HC and NOdx emissions in most cases all improve with EGR compared to lean burn. Combustion efficiency, which is computed based on exhaust gas analysis, increases with EGR due to lower emissions of CO and HC. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
EGR, Combustion, HCCI, Engine
in
SAE Special Publications
volume
2003
issue
1742
pages
21 - 38
publisher
Society of Automotive Engineers
external identifiers
  • Scopus:77957888908
language
English
LU publication?
yes
id
26bcbeca-67eb-4074-9027-202f642f096e (old id 538212)
alternative location
http://www.ingentaconnect.com/content/docdel/art1031492488
http://www.sae.org/technical/papers/2003-01-0743
date added to LUP
2007-09-24 13:56:47
date last changed
2016-10-13 04:41:08
@misc{26bcbeca-67eb-4074-9027-202f642f096e,
  abstract     = {This paper discusses the effects of cooled EGR on a turbocharged multi-cylinder HCCI engine. A six-cylinder, 12-liter, Scania D12 truck engine is modified for HCCI operation. It is fitted with port fuel injection of ethanol and n-heptane and cylinder pressure sensors for closed-loop combustion control. The effects of EGR are studied in different operating regimes of the engine. During idle, low speed and no load, the focus is on the effects on combustion efficiency, emissions of unburned hydrocarbons and CO. At intermediate load, run without turbocharging to achieve a well-defined experiment, combustion efficiency and emissions from incomplete combustion are still of interest. However the effect on NOdx and the thermodynamic effect on thermal efficiency, from a different gas composition, are studied as well. At high load and boost pressure the main focus is NOdx emissions and the ability to run high mean effective pressure without exceeding the physical constraints of the engine. In this case the effects of EGR on boost and combustion duration and phasing are of primary interest. It is shown that CO, HC and NOdx emissions in most cases all improve with EGR compared to lean burn. Combustion efficiency, which is computed based on exhaust gas analysis, increases with EGR due to lower emissions of CO and HC.},
  author       = {Olsson, Jan-Ola and Tunestål, Per and Ulfvik, Jonas and Johansson, Bengt},
  keyword      = {EGR,Combustion,HCCI,Engine},
  language     = {eng},
  number       = {1742},
  pages        = {21--38},
  publisher    = {ARRAY(0x98c8d60)},
  series       = {SAE Special Publications},
  title        = {The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine},
  volume       = {2003},
  year         = {2003},
}