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Ion Current Sensing in an Optical HCCI Engine with Negative Valve Overlap

Chalmers University of Technology-Martin Larsson, Ingemar Denbratt
Volvo Car Corporation-Lucien Koopmans
Published 2007-01-23 by SAE International in United States
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…
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Comparative Study of In-Cylinder Pressure Sensors for Combustion Engine Feedback Control

Chalmers University of Technology-Martin Larsson, Ingemar Denbratt
Volvo Car Corporation-Lucien Koopmans
  • Technical Paper
  • 2006-08-0187
Published 2006-05-01 by Society of Automotive Engineers of Japan in Japan
Developing more sensitive controls for internal combustion engines to meet increasingly strict emission limits is becoming an urgent task, especially for automotive engines. Pressure-sensing systems could be important components of such controls, especially since recent advances have reduced their costs, and increased both their durability and the available options. For these reasons three different types of pressure sensor (one piezo-resistive, one fiber optic and one gasket-type) were installed and evaluated in a single-cylinder SI engine, using a water-cooled piezoelectric pressure sensor as a reference system. In addition, heat release analysis and pressure ratio management strategies were explored to compare the potential utility of different combustion-phasing measures. This paper describes the key findings and discusses their implications.