In a previous study, a wide range of gasolines with RON∼90 were tested in a single cylinder engine operated in HCCI mode using negative valve overlap, and all were found to have very similar behavior near the low-load limit. Here we broaden the range of gasolines to include PRF90 and PRF60. At high engine speed, both PRF60 and PRF90 behave similarly to all the other gasolines tested. However, at 1000 RPM, PRF90 is very different from all the other gasolines: it ignites very late, and the engine cannot be operated at low load. Simulations using a popular fuel chemistry model cannot distinguish PRF60 and PRF90 under these conditions. However, a new fuel chemistry model correctly shows the onset of fuel sensitivity at low engine speed. Sensitivity analyses indicate the low-load limit at low engine speed strongly depend on both the chemistry parameters and on the heat-transfer parameters.
Primary Reference Fuel Behavior in a HCCI Engine near the Low-Load Limit
Sae Int. J. Fuels Lubr
Sae International Journal of Fuels and Lubricants
2008 SAE International Powertrains, Fuels and Lubricants Congress ; 2008
Sae International Journal of Fuels and Lubricants ; 1 , 1 ; 1098-1109
2008-06-23
12 pages
Aufsatz (Konferenz)
Englisch
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