Browse Publications Technical Papers 2007-01-0219
2007-04-16

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.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

A Computational Analysis of Direct Fuel Injection During the Negative Valve Overlap Period in an Iso-Octane Fueled HCCI Engine

2007-01-0227

View Details

TECHNICAL PAPER

HCCI Combustion Control by Injection Strategy with Negative Valve Overlap in a GDI Engine

2006-01-0415

View Details

TECHNICAL PAPER

Expansion of HCCI Operating Region by the Combination of Direct Fuel Injection, Negative Valve Overlap and Internal Fuel Reformation

2003-01-0749

View Details

X