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Fuel Effects on Ion Current in an HCCI Engine

Vressner, Andreas LU ; Hultqvist, Anders LU ; Tunestål, Per LU ; Johansson, Bengt LU and Hasegawa, Ryo LU (2005) In SAE Transactions, Journal of Engines 114(3). p.1382-1395
Abstract
An interest in measuring ion current in Homogeneous Charge Compression Ignition (HCCI) engines arises when one wants to use a cheaper probe for feedback of the combustion timing than expensive piezo electric pressure transducers. However the location of the ion current probe, in this case a spark plug, is of importance for both signal strength and the crank angle position where the signal is obtained. Different fuels will probably affect the ion current in both signal strength and timing and this is the main interest of this investigation. The measurements were performed on a Scania D12 engine in single cylinder operation and ion current was measured at 7 locations simultaneously. By arranging this setup there was a possibility to... (More)
An interest in measuring ion current in Homogeneous Charge Compression Ignition (HCCI) engines arises when one wants to use a cheaper probe for feedback of the combustion timing than expensive piezo electric pressure transducers. However the location of the ion current probe, in this case a spark plug, is of importance for both signal strength and the crank angle position where the signal is obtained. Different fuels will probably affect the ion current in both signal strength and timing and this is the main interest of this investigation. The measurements were performed on a Scania D12 engine in single cylinder operation and ion current was measured at 7 locations simultaneously. By arranging this setup there was a possibility to investigate if the ion current signals from the different spark plug locations would correlate with the fact that, for this particular engine, the combustion starts at the walls and propagates towards the center of the combustion chamber. The fuels investigated were isooctane, n-heptane, PRF80, gasoline, diesel, ethanol and methanol. A special interest was how the ion current timing was affected by low temperature reactions, which were present with the n-heptane and diesel fuels as well as mixtures of isooctane and n-heptane, i.e., PRF80. The most interesting results were that ion current is both affected by the ion current probe location in the combustion chamber and the fuel used. Fuels with higher octane numbers seem to provoke ion current more easily, thus with LTR fuels as n-heptane and diesel ion current was only achieved at richer mixtures. The cycle-to-cycle variations of ion current increased with leaner mixtures. Ion current was also affected by combustion phasing and engine speed. (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
Ion Current, Fuel Effects, HCCI, Engine
in
SAE Transactions, Journal of Engines
volume
114
issue
3
pages
1382 - 1395
publisher
Society of Automotive Engineers
external identifiers
  • scopus:84877195351
ISSN
0096-736X
language
English
LU publication?
yes
id
b19db343-28f5-4242-918f-5d638c1c3b45 (old id 164414)
alternative location
http://www.ingentaconnect.com/content/docdel/art1055541592
http://www.sae.org/technical/papers/2005-01-2093
date added to LUP
2007-07-04 08:55:17
date last changed
2017-09-10 04:24:36
@article{b19db343-28f5-4242-918f-5d638c1c3b45,
  abstract     = {An interest in measuring ion current in Homogeneous Charge Compression Ignition (HCCI) engines arises when one wants to use a cheaper probe for feedback of the combustion timing than expensive piezo electric pressure transducers. However the location of the ion current probe, in this case a spark plug, is of importance for both signal strength and the crank angle position where the signal is obtained. Different fuels will probably affect the ion current in both signal strength and timing and this is the main interest of this investigation. The measurements were performed on a Scania D12 engine in single cylinder operation and ion current was measured at 7 locations simultaneously. By arranging this setup there was a possibility to investigate if the ion current signals from the different spark plug locations would correlate with the fact that, for this particular engine, the combustion starts at the walls and propagates towards the center of the combustion chamber. The fuels investigated were isooctane, n-heptane, PRF80, gasoline, diesel, ethanol and methanol. A special interest was how the ion current timing was affected by low temperature reactions, which were present with the n-heptane and diesel fuels as well as mixtures of isooctane and n-heptane, i.e., PRF80. The most interesting results were that ion current is both affected by the ion current probe location in the combustion chamber and the fuel used. Fuels with higher octane numbers seem to provoke ion current more easily, thus with LTR fuels as n-heptane and diesel ion current was only achieved at richer mixtures. The cycle-to-cycle variations of ion current increased with leaner mixtures. Ion current was also affected by combustion phasing and engine speed.},
  author       = {Vressner, Andreas and Hultqvist, Anders and Tunestål, Per and Johansson, Bengt and Hasegawa, Ryo},
  issn         = {0096-736X},
  keyword      = {Ion Current,Fuel Effects,HCCI,Engine},
  language     = {eng},
  number       = {3},
  pages        = {1382--1395},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Engines},
  title        = {Fuel Effects on Ion Current in an HCCI Engine},
  volume       = {114},
  year         = {2005},
}