Experimental Investigation into the Effects of Direct Fuel Injection During the Negative Valve Overlap Period in an Gasoline Fueled HCCI Engine 2007-01-0219
A single cylinder Yamaha research engine was operated with gasoline HCCI combustion using negative valve overlap (NVO). The injection strategy for this study involved using fuel injected directly into the cylinder during the NVO period (pre-DI) along with a secondary injection either in the intake port (PI) or directly into the cylinder (DI). The effects of timing of the pre-DI injection along with the percent of fuel injected during the pre-DI injection were studied in two sets of experiments using secondary PI and DI injections in separate experiments.
Results have shown that by varying the pre-DI timing and pre-DI percent the main HCCI combustion timing can be influenced as a result of varied heat release during the negative valve overlap period along with hypothesized varied degrees of reformation of the pre-DI injected fuel. In addition to varying the main combustion timing the ISFC, emissions and combustion stability are all influenced by changes in pre-DI timing and percent.
Experiments performed using secondary DI and secondary PI have shown similar trends on the influence of HCCI combustion timing when the pre-DI timing and pre-DI percent are varied.
Citation: Waldman, J., Nitz, D., Aroonsrisopon, T., Foster, D. et al., "Experimental Investigation into the Effects of Direct Fuel Injection During the Negative Valve Overlap Period in an Gasoline Fueled HCCI Engine," SAE Technical Paper 2007-01-0219, 2007, https://doi.org/10.4271/2007-01-0219. Download Citation
Author(s):
John Waldman, Dennis Nitz, Tanet Aroonsrisopon, David E. Foster, Minoru Iida
Affiliated:
Engine Research Center, University of Wisconsin-Madison, Yamaha Motor Company, Japan
Pages: 15
Event:
SAE World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Homogeneous Charge Compression Ignition Engines, 2007-SP-2100
Related Topics:
HCCI engines
Combustion and combustion processes
Fuel injection
Engine cylinders
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