Comparative study of gasoline HCCI and MPCI modes in a diesel engine

Paper #:
  • 2017-01-2257

Published:
  • 2017-10-08
Abstract:
This study compares the combustion and emission performance of gasoline Homogeneous Charge Compression Ignition (HCCI) and Multiple Premixed Compression Ignition (MPCI) in a single-cylinder, intake-boosting and water-cooling diesel engine with a compression ratio of 16.7. The test fuel was commercial gasoline in China with RON of 92, and intake pressure varied from 0.16 to 0.21 MPa, while Indicated Mean Effective Pressure (IMEP) was fixed at 1.0 MPa. Both the knock limit and misfire limit of gasoline HCCI were studied. The results showed that Low Temperature Heat Release (LTHR) was observed before High Temperature Heat Release (HTHR) in gasoline HCCI, and the LTHR accounted for less than 10 percent of total heat release. The knock limit and misfire limit of gasoline HCCI coincided when the intake pressure decreased to 0.16 MPa. Increasing the intake pressure helped to promote the Indicated Thermal Efficiency (ITE) for both gasoline HCCI and MPCI. When intake pressure was increased, CA50 was advanced and combustion duration extended with HCCI mode, while CA50 remained the same and combustion duration was shortened with MPCI mode. CO emission of both gasoline HCCI and MPCI increased with intake pressure increasing, while HC emission of both modes showed little change. However, CO and HC emissions of HCCI mode were dramatically higher than those of MPCI mode, while near-zero NOx and soot emissions of HCCI mode were observed.
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