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HCCI Combustion Phasing in a Multi Cylinder Engine Using Variable Compression Ratio

Haraldsson, Göran LU ; Hyvönen, Jari LU ; Tunestål, Per LU and Johansson, Bengt LU (2002) In SAE Transactions, Journal of Engines 111(3). p.2554-2663
Abstract
Combustion phasing in a Homogeneous Charge Compression Ignition (HCCI) engine can be achieved by affecting the time history of pressure and temperature in the cylinder. The most common way has been to control the inlet air temperature and thereby the temperature in the cylinder at the end of the compression stroke. However this is a slow parameter to control, especially cycle to cycle. A multi- cylinder engine using Variable Compression Ratio (VCR) for controlling the compression temperature and consequently the combustion phasing is used in the experiments. Operating range in terms of speed and load is investigated in naturally aspirated mode. Trade-off between inlet air temperature and Compression Ratio (CR) is evaluated. Primary... (More)
Combustion phasing in a Homogeneous Charge Compression Ignition (HCCI) engine can be achieved by affecting the time history of pressure and temperature in the cylinder. The most common way has been to control the inlet air temperature and thereby the temperature in the cylinder at the end of the compression stroke. However this is a slow parameter to control, especially cycle to cycle. A multi- cylinder engine using Variable Compression Ratio (VCR) for controlling the compression temperature and consequently the combustion phasing is used in the experiments. Operating range in terms of speed and load is investigated in naturally aspirated mode. Trade-off between inlet air temperature and Compression Ratio (CR) is evaluated. Primary reference fuels, isooctane/n-heptane, are used during the tests. High-speed HCCI operation up to 5000 rpm is possible with a fuel corresponding to RON 60. The effect of octane number with and without exhaust cam phasing is also investigated. Brake thermal efficiency of 33% at a maximum load of 4.4 bar BMEP for 2000 rpm is achieved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Closed-Loop Combustion Control, HCCI, Engine Control
in
SAE Transactions, Journal of Engines
volume
111
issue
3
pages
2554 - 2663
publisher
Society of Automotive Engineers
external identifiers
  • scopus:79959859457
ISSN
0096-736X
language
English
LU publication?
yes
id
c2945d10-cb1f-4bdc-8eba-a5456b1b29e1 (old id 163605)
date added to LUP
2007-07-04 09:05:40
date last changed
2017-03-12 04:28:18
@article{c2945d10-cb1f-4bdc-8eba-a5456b1b29e1,
  abstract     = {Combustion phasing in a Homogeneous Charge Compression Ignition (HCCI) engine can be achieved by affecting the time history of pressure and temperature in the cylinder. The most common way has been to control the inlet air temperature and thereby the temperature in the cylinder at the end of the compression stroke. However this is a slow parameter to control, especially cycle to cycle. A multi- cylinder engine using Variable Compression Ratio (VCR) for controlling the compression temperature and consequently the combustion phasing is used in the experiments. Operating range in terms of speed and load is investigated in naturally aspirated mode. Trade-off between inlet air temperature and Compression Ratio (CR) is evaluated. Primary reference fuels, isooctane/n-heptane, are used during the tests. High-speed HCCI operation up to 5000 rpm is possible with a fuel corresponding to RON 60. The effect of octane number with and without exhaust cam phasing is also investigated. Brake thermal efficiency of 33% at a maximum load of 4.4 bar BMEP for 2000 rpm is achieved.},
  author       = {Haraldsson, Göran and Hyvönen, Jari and Tunestål, Per and Johansson, Bengt},
  issn         = {0096-736X},
  keyword      = {Closed-Loop Combustion Control,HCCI,Engine Control},
  language     = {eng},
  number       = {3},
  pages        = {2554--2663},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Engines},
  title        = {HCCI Combustion Phasing in a Multi Cylinder Engine Using Variable Compression Ratio},
  volume       = {111},
  year         = {2002},
}