Engine operation with spark ignition retarded from MBT timing is used at cold start to reduce HC emissions and increase exhaust gas temperature; however it also results in increased cyclic variations. Steady-state cold fluids testing was performed to better understand the causes of the cycle-to-cycle variations. Detailed analysis of individual cycles was performed to help gain an understanding of the causes of cyclic variations. The important results were:
SI Engine Operation with Retarded Ignition: Part 1 - Cyclic Variations
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1999
1999-10-25
Conference paper
English
Spark-ignition engine operation with retarded ignition: part 1 - cyclic variations
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