Abstract
Homogeneous charge compression ignition (HCCI) is an alterna -tive combustion process which received considerable interest to meetthe stringent emission norms. One such technology developed is par -tially premixed charge compression ignition (PCCI) combustion modea variant of HCCI combustion mode. In this work an attempt has beenmade to experimentally analyze the performance and emission char-acteristics with Premixed Charge Compression Ignition (PCCI) modeassisted with pilot injection. Experiments were conducted in a modifiedsingle cylinder water-cooled diesel engine employing a conceptual sys -tem known as transient state fuel induction with different modes suchas diesel and biodiesel conventional mode, diesel PCCI–diesel, biodieselPCCI-diesel and biodiesel PCCI-biodiesel modes. In the present work,diesel and jatropha methyl ester was used premixed fuel along with con-ventional injection of either diesel or 20% jatropha oil methyl ester blendwith diesel. The results indicate that brake thermal efficiency decreasesmarginally as the methyl ester in the conventional and PCCI modes andHC, CO emissions are higher and soot levels are lower in the case ofbiodiesel PCCI-biodiesel mode.
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