New Hcci/Cai Combustion Process Development: Methodology for Determination

Abstract : To pass the simultaneous emission requirements for near zero pollutant and low CO2 levels, which are the challenges for future powertrains, many research studies are currently carried out over the world on new engine combustion processes, such as controlled auto-ignition (CAITM) for gasoline engines and homogeneous charge compression ignition (HCCI) for Diesel engines. These new processes have the potential to reduce, by a factor of 10 to 100, NOx (Nitric Oxide emissions) and particulate (PM) emissions in comparison with a typical gasoline or diesel engine. The main issue in the development of such combustion modes remains the limited range of engine speed and load that enable correct engine running, with acceptable levels of NOx and noise emissions. One of the promising ways to increase the CAI combustion range lies in the research of more adapted fuels, optimized to enhance combustion initiation by modifying and controlling their auto-ignition characteristics and/or their physical and chemical properties. A new procedure is set-up to select fuels, which allows a better characterization of the fuel impact on engine running in CAI, for various conditions of speed and load. The use of this methodology with a wide range of fuels, formulated according to their auto-ignition characteristics, volatility and chemical composition, underlines the complexity of the action of fuel and points out the most influent fuel characteristics for a wide range of running conditions.
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N. Jeuland, X. Montagne, P. Duret. New Hcci/Cai Combustion Process Development: Methodology for Determination. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2004, 59 (6), pp.571-579. ⟨10.2516/ogst:2004041⟩. ⟨hal-02017335⟩

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