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Boosting for High Load HCCI

Olsson, Jan-Ola LU ; Tunestål, Per LU and Johansson, Bengt LU (2004) In SAE Transactions, Journal of Engines 113(3). p.579-588
Abstract
Homogeneous Charge Compression Ignition (HCCI) holds great promises for good fuel economy and low emissions of NOdx and soot. The concept of HCCI is premixed combustion of a highly diluted mixture. The dilution limits the combustion temperature and thus prevents extensive NOdx production. Load is controlled by altering the quality of the charge, rather than the quantity. No throttling together with a high compression ratio to facilitate autoignition and lean mixtures results in good brake thermal efficiency. However, HCCI also presents challenges like how to control the combustion and how to achieve an acceptable load range. This work is focused on solutions to the latter problem.



The high dilution required to avoid NOdx... (More)
Homogeneous Charge Compression Ignition (HCCI) holds great promises for good fuel economy and low emissions of NOdx and soot. The concept of HCCI is premixed combustion of a highly diluted mixture. The dilution limits the combustion temperature and thus prevents extensive NOdx production. Load is controlled by altering the quality of the charge, rather than the quantity. No throttling together with a high compression ratio to facilitate autoignition and lean mixtures results in good brake thermal efficiency. However, HCCI also presents challenges like how to control the combustion and how to achieve an acceptable load range. This work is focused on solutions to the latter problem.



The high dilution required to avoid NOdx production limits the mass of fuel relative to the mass of air or EGR. For a given size of the engine the only way to recover the loss of power due to dilution is to force more mass through the engine. This paper shows that this can be done by the use of turbocharging or a mechanically driven compressor. The cost of forcing more air through the engine and the higher peak pressure requirements are discussed and quantified by simple engine modelling supported by experimental data. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combustion, HCCI, Engine
in
SAE Transactions, Journal of Engines
volume
113
issue
3
pages
579 - 588
publisher
Society of Automotive Engineers
external identifiers
  • scopus:79959541170
ISSN
0096-736X
language
English
LU publication?
yes
id
c1493c04-7672-4aab-a658-4b71397b1fbe (old id 163617)
alternative location
http://www.sae.org/technical/papers/2004-01-0940
http://www.ingentaconnect.com/content/docdel/art1045772220
date added to LUP
2007-07-04 09:50:13
date last changed
2017-12-03 03:38:32
@article{c1493c04-7672-4aab-a658-4b71397b1fbe,
  abstract     = {Homogeneous Charge Compression Ignition (HCCI) holds great promises for good fuel economy and low emissions of NOdx and soot. The concept of HCCI is premixed combustion of a highly diluted mixture. The dilution limits the combustion temperature and thus prevents extensive NOdx production. Load is controlled by altering the quality of the charge, rather than the quantity. No throttling together with a high compression ratio to facilitate autoignition and lean mixtures results in good brake thermal efficiency. However, HCCI also presents challenges like how to control the combustion and how to achieve an acceptable load range. This work is focused on solutions to the latter problem.<br/><br>
<br/><br>
The high dilution required to avoid NOdx production limits the mass of fuel relative to the mass of air or EGR. For a given size of the engine the only way to recover the loss of power due to dilution is to force more mass through the engine. This paper shows that this can be done by the use of turbocharging or a mechanically driven compressor. The cost of forcing more air through the engine and the higher peak pressure requirements are discussed and quantified by simple engine modelling supported by experimental data.},
  author       = {Olsson, Jan-Ola and Tunestål, Per and Johansson, Bengt},
  issn         = {0096-736X},
  keyword      = {Combustion,HCCI,Engine},
  language     = {eng},
  number       = {3},
  pages        = {579--588},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Engines},
  title        = {Boosting for High Load HCCI},
  volume       = {113},
  year         = {2004},
}