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Multiple Point Ion Current Diagnostics in an HCCI Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 8, 2004 by SAE International in United States
Annotation ability available
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.
- 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
CitationVressner, 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.
Homogeneous Charge Compression Ignition (Hcci) Combustion 2004
Number: SP-1819; Published: 2004-03-08
Number: SP-1819; Published: 2004-03-08
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