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It is known that the levels of hydrocarbon (HC) emissions from Homogeneous Charge Compression Ignition (HCCI) engines are relatively higher than that of Spark-Ignition (SI) engines because of the lower combustion temperature. In order to improve understanding of the mechanisms and products of HCCI combustion in comparison with SI combustion, a quantitative analysis of individual hydrocarbons in the C1 - C6 range emitted in the exhaust gases of gasoline direct injection V6 engine operating in SI and HCCI modes with cam profile switching has been carried out using gas chromatography - mass spectrometry (GCMS) apparatus attached on-line to engine exhaust. In this study, with a GC run time of 20 minutes all aliphatic and olefinic hydrocarbon species in the range C1 to C6 are resolved.

Increasing biodiesel content in mineral diesel is being promoted considerably for road transportation in Europe. With positive benefits in terms of net CO2 emissions, biofuels with compatible properties to those of conventional diesel are increasingly being used in combustion engines. In comparison to standard diesel fuel, the near zero sulphur content and low levels of aromatic compounds in biodiesel fuel can have a profound effect not only on combustion characteristics but on engine-out emissions as well. This paper presents analysis of particulate matter (PM) emissions from a turbo-charged, common rail direct injection (DI) V6 Jaguar engine operating with an RME (rapeseed methyl ester) biodiesel blended with ultra low sulphur diesel (ULSD) fuel (B30 - 30% of RME by volume). Three different engine load and speed conditions were selected for the test and no modifications were made to the engine hardware or engine management system (EMS) calibration.