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Ion Current Sensing in an Optical HCCI Engine with Negative Valve Overlap
Technical Paper
2007-01-0009
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Ion current sensors have high potential utility for obtaining feedback signals directly from the combustion chamber in internal combustion engines. This paper describes experiments performed in a single-cylinder optical engine operated in HCCI mode with negative valve overlap to explore this potential. A high-speed CCD camera was used to visualize the combustion progress in the cylinder, and the photographs obtained were compared with the ion current signals. The optical data indicate that the ions responsible for the chemiluminescence from the HCCI combustion have to be in contact with the sensing electrode for an ion current to start flowing through the measurement circuit. This also means that there will be an offset between the time at which 50% of the fuel mass has burned and 50% of the ion current peak value is reached, which is readily explained by the results presented in the paper. In addition the results show that the ion current sensor generates good combustion phasing signals for HCCI combustion with negative valve overlap at low engine speeds and low engine loads, provided that the electrode area and bias voltage are both sufficiently large.
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Larsson, M., Denbratt, I., and Koopmans, L., "Ion Current Sensing in an Optical HCCI Engine with Negative Valve Overlap," SAE Technical Paper 2007-01-0009, 2007, https://doi.org/10.4271/2007-01-0009.Also In
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