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Multiple Point Ion Current Diagnostics in an HCCI Engine

Vressner, Andreas LU ; Strandh, Petter LU ; Hultqvist, Anders LU ; Tunestål, Per LU and Johansson, Bengt LU (2004) In SAE Transactions, Journal of Engines 113(3). p.544-550
Abstract
Interest in ion current sensing for HCCI combustion arises when a feedback signal from some sort of combustion sensor is needed in order to determine the state of the combustion process. A previous study has revealed that ion current sensors in the form of spark plugs can be used instead of expensive piezoelectric transducers for HCCI combustion sensing. Sufficiently high ion current levels were achieved when using relatively rich mixtures diluted with EGR. The study also shows that it is not the actual dilution per se but the actual air/fuel equivalence ratio which is important for the signal level. Conclusions were made that it is possible to obtain information on combustion timing and oscillating wave phenomena from the measurements.... (More)
Interest in ion current sensing for HCCI combustion arises when a feedback signal from some sort of combustion sensor is needed in order to determine the state of the combustion process. A previous study has revealed that ion current sensors in the form of spark plugs can be used instead of expensive piezoelectric transducers for HCCI combustion sensing. Sufficiently high ion current levels were achieved when using relatively rich mixtures diluted with EGR. The study also shows that it is not the actual dilution per se but the actual air/fuel equivalence ratio which is important for the signal level. Conclusions were made that it is possible to obtain information on combustion timing and oscillating wave phenomena from the measurements. However, the study showed that the ion current is local compared to the pressure which is global in the combustion chamber. This observation triggered the

present study where the aim is to investigate the ion current at different locations in the combustion chamber. The ion current was measured simultaneously at seven locations in the combustion chamber. In order to achieve this, 6 spark plugs were fitted circumferentially in a spacer placed between the cylinder block and the head. The seventh spark plug was placed in the cylinder head. Individual DC sources of 85 volts were applied across the spark plug gaps. The present study indicates that the combustion timing seems to be dependent on the wall temperature at the different spark plug locations. The largest difference in timing between different locations in the combustion chamber was 2 CAD. The ion current amplitude varies with different spark plug locations up to 1.5 μA. The signal strength increases with decreasing air/fuel ratio and is also affected by dilution. (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
HCCI, Multiple locations, Ion Current, Engine
in
SAE Transactions, Journal of Engines
volume
113
issue
3
pages
544 - 550
publisher
Society of Automotive Engineers
external identifiers
  • scopus:84877165086
ISSN
0096-736X
language
English
LU publication?
yes
id
4dc5659f-b3d2-445f-9733-b36595f7fa23 (old id 164406)
alternative location
http://www.ingentaconnect.com/content/docdel/art1045772217
http://www.sae.org/technical/papers/2004-01-0934
date added to LUP
2007-07-04 08:52:52
date last changed
2017-12-10 04:26:46
@article{4dc5659f-b3d2-445f-9733-b36595f7fa23,
  abstract     = {Interest in ion current sensing for HCCI combustion arises when a feedback signal from some sort of combustion sensor is needed in order to determine the state of the combustion process. A previous study has revealed that ion current sensors in the form of spark plugs can be used instead of expensive piezoelectric transducers for HCCI combustion sensing. Sufficiently high ion current levels were achieved when using relatively rich mixtures diluted with EGR. The study also shows that it is not the actual dilution per se but the actual air/fuel equivalence ratio which is important for the signal level. Conclusions were made that it is possible to obtain information on combustion timing and oscillating wave phenomena from the measurements. However, the study showed that the ion current is local compared to the pressure which is global in the combustion chamber. This observation triggered the<br/><br>
present study where the aim is to investigate the ion current at different locations in the combustion chamber. The ion current was measured simultaneously at seven locations in the combustion chamber. In order to achieve this, 6 spark plugs were fitted circumferentially in a spacer placed between the cylinder block and the head. The seventh spark plug was placed in the cylinder head. Individual DC sources of 85 volts were applied across the spark plug gaps. The present study indicates that the combustion timing seems to be dependent on the wall temperature at the different spark plug locations. The largest difference in timing between different locations in the combustion chamber was 2 CAD. The ion current amplitude varies with different spark plug locations up to 1.5 μA. The signal strength increases with decreasing air/fuel ratio and is also affected by dilution.},
  author       = {Vressner, Andreas and Strandh, Petter and Hultqvist, Anders and Tunestål, Per and Johansson, Bengt},
  issn         = {0096-736X},
  keyword      = {HCCI,Multiple locations,Ion Current,Engine},
  language     = {eng},
  number       = {3},
  pages        = {544--550},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Engines},
  title        = {Multiple Point Ion Current Diagnostics in an HCCI Engine},
  volume       = {113},
  year         = {2004},
}