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Homogeneous charge compression ignition (HCCI) is considered as a clean and high effective combustion technology. Alternative fuel Dimethyl Ether(DME) has some problems in HCCI combustion mode, such as narrow stable conditions and higher unregulated emissions. In this research, a single cylinder diesel engine zs195 was applied to HCCI operation, methanol and DME were fueled to the engine by fuel injection system with an electric controlled port in dual fuel mode. Regulated DME and methanol proportions can significantly expand the stable HCCI operation and obtained over a broad speed and load region. The emission tests indicated that NOx and smoke emissions were overall very low under normal HCCI operation, while HC and CO emissions were much higher than conventional CI-engines. HC and CO emissions increased with methanol content but reduced with output power.

The effects of different ethanol-diesel blended fuels on the performance and emissions of a single cylinder engine have been experimentally evaluated and compared in this study. Several diesel blends containing up to 20% ethanol have been operated on the IC engine and compared with the pure diesel fuel. The regulated and unregulated emissions have been measured, the regulated emissions were HC, CO, NOx and CO2, the unregulated emissions were formaldehyde(CH20), formic acid(HCOOH), acetaldehyde(CH3CHO) and ethanol(C2HsOH). Addition of ethanol in the fuel made an increase of ignition delay and burning phase lag, but had little effects on the largest pressure of cylinder. The emission tests indicated that NOx emissions declined with the increasing ethanol-containing, especially in high-speed and high-load conditions. For ethanol-containing fuels, HC emissions were appreciably increasing (up to 50%).CO emissions were extremely high under high load conditions.