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Multiple Point Ion Current Diagnostics in an HCCI Engine
Technical Paper
2004-01-0934
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
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 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.
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Authors
- Andreas Vressner - Division of Combustion Engines, Lund Institute of Technology
- Petter Strandh - Division of Combustion Engines, Lund Institute of Technology
- Anders Hultqvist - Division of Combustion Engines, Lund Institute of Technology
- Per Tunestål - Division of Combustion Engines, Lund Institute of Technology
- Bengt Johansson - Division of Combustion Engines, Lund Institute of Technology
Citation
Vressner, A., Strandh, P., Hultqvist, A., Tunestål, P. et al., "Multiple Point Ion Current Diagnostics in an HCCI Engine," SAE Technical Paper 2004-01-0934, 2004, https://doi.org/10.4271/2004-01-0934.Also In
Homogeneous Charge Compression Ignition (Hcci) Combustion 2004
Number: SP-1819; Published: 2004-03-08
Number: SP-1819; Published: 2004-03-08
References
- Christensen Magnus Homogeneous Charge Compression Ignition (HCCI) Engine -Mixture Requirements, Engine Load Range and Emission Characteristics Department of Heat & Power Engineering Lund 2002
- Johansson Bengt Internal Combustion Engines, part 1 & 2 Department of Heat & Power Engineering Lund
- Strandh Petter Christensen Magnus Bengtsson Johan Johansson Rolf Vressner Andreas Tunestål Per Johansson Bengt Ion Current Sensing for HCCI Combustion Feedback SAE 2003-01-3216
- Auzins John Johansson Hasse Nytomt Jan Ion-Gap Sense in Misfire Detection, Knock and Engine Control SAE 950004
- Förster Jürgen Günther Achim Ketterer Markus Wald Klaus-Jürgen Ion Current Sensing for Spark Ignition Engines SAE 1999-01-0204
- Olsson Jan-Ola Tunestål Per Johansson Bengt Closed-Loop Control of an HCCI Engine SAE 2001-01-1031
- Olsson Jan-Ola Tunestål Per Ulfvik Jonas Johansson Bengt The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine