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Influence of Mixture Quality on Homogeneous Charge Compression Ignition

Christensen, Magnus LU and Johansson, Bengt LU (1998) In SAE Transactions, Journal of Fuels and Lubricants 107.
Abstract
The major advantages with Homogeneous Charge Compression Ignition, HCCI, is high efficiency in combination with low NOx emissions. The major drawback with HCCI is the problem to control the ignition timing over a wide load and speed range. Other drawbacks are the limitation in attainable IMEP and relatively high emissions of unburned hydrocarbons. But the use of Exhaust Gas Recycling (EGR) instead of only air, slows down the rate of combustion and makes it possible to use lower air/fuel ratio, which increases the attainable upper load limit. The influence of mixture quality was therefore experimentally investigated. The effects of different EGR rates, air/fuel rations and inlet mixture temperatures were studied. The compression ratio was... (More)
The major advantages with Homogeneous Charge Compression Ignition, HCCI, is high efficiency in combination with low NOx emissions. The major drawback with HCCI is the problem to control the ignition timing over a wide load and speed range. Other drawbacks are the limitation in attainable IMEP and relatively high emissions of unburned hydrocarbons. But the use of Exhaust Gas Recycling (EGR) instead of only air, slows down the rate of combustion and makes it possible to use lower air/fuel ratio, which increases the attainable upper load limit. The influence of mixture quality was therefore experimentally investigated. The effects of different EGR rates, air/fuel rations and inlet mixture temperatures were studied. The compression ratio was set to 18:1. The fuels used were iso-octane, ethanol and commercially available natural gas. The engine was operated in naturally aspirated mode for all tests. Stable operation could be achieved with ethanol at about 5 bar of IMEP with a gross indicated efficiency close to 50%. Stable operation of the engine was achieved with over 60% EGR. (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
Mixture Quality, HCCI, Combustion, Engine
in
SAE Transactions, Journal of Fuels and Lubricants
volume
107
publisher
Society of Automotive Engineers
external identifiers
  • scopus:77952822262
ISSN
0096-736X
language
English
LU publication?
yes
id
7ef62132-150f-4999-9e6e-eacc634f884b (old id 164567)
alternative location
http://www.sae.org/technical/papers/982454
date added to LUP
2007-06-27 11:58:51
date last changed
2017-05-28 04:41:39
@article{7ef62132-150f-4999-9e6e-eacc634f884b,
  abstract     = {The major advantages with Homogeneous Charge Compression Ignition, HCCI, is high efficiency in combination with low NOx emissions. The major drawback with HCCI is the problem to control the ignition timing over a wide load and speed range. Other drawbacks are the limitation in attainable IMEP and relatively high emissions of unburned hydrocarbons. But the use of Exhaust Gas Recycling (EGR) instead of only air, slows down the rate of combustion and makes it possible to use lower air/fuel ratio, which increases the attainable upper load limit. The influence of mixture quality was therefore experimentally investigated. The effects of different EGR rates, air/fuel rations and inlet mixture temperatures were studied. The compression ratio was set to 18:1. The fuels used were iso-octane, ethanol and commercially available natural gas. The engine was operated in naturally aspirated mode for all tests. Stable operation could be achieved with ethanol at about 5 bar of IMEP with a gross indicated efficiency close to 50%. Stable operation of the engine was achieved with over 60% EGR.},
  author       = {Christensen, Magnus and Johansson, Bengt},
  issn         = {0096-736X},
  keyword      = {Mixture Quality,HCCI,Combustion,Engine},
  language     = {eng},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Fuels and Lubricants},
  title        = {Influence of Mixture Quality on Homogeneous Charge Compression Ignition},
  volume       = {107},
  year         = {1998},
}