Residual Gas Trapping for Natural Gas HCCI

D Yap, Athanasios Megaritis, Miroslaw Wyszynski, Hongming Xu

Research output: Contribution to journalArticle

16 Citations (Scopus)


With the high auto ignition temperature of natural gas, various approaches such as high compression ratios and/or intake charge heating are required for auto ignition. Another approach utilizes the trapping of internal residual gas (as used before in gasoline controlled auto ignition engines), to lower the thermal requirements for the auto ignition process in natural gas. In the present work, the achievable engine load range is controlled by the degree of internal trapping of exhaust gas supplemented by intake charge heating. Special valve strategies were used to control the internal retention of exhaust gas. Significant differences in the degree of valve overlap were necessary when compared to gasoline operation at the same speeds and loads, resulting in lower amounts of residual gas observed. The dilution effect of residual gas trapping is hence reduced, resulting in higher NOx emissions for the stoichiometric air/fuel ratio operation as compared to gasoline.
Original languageEnglish
Article number2004-01-1973
JournalSAE Technical Papers
Publication statusPublished - 8 Jun 2004


Dive into the research topics of 'Residual Gas Trapping for Natural Gas HCCI'. Together they form a unique fingerprint.

Cite this