Browse Publications Technical Papers 2007-01-0191
2007-04-16

Effects of Fuel Property Changes on Heavy-Duty HCCI Combustion 2007-01-0191

Homogeneous charge compression ignition (HCCI) offers the potential for significant improvements in efficiency with a substantial reduction in emissions. However, achieving heavy-duty (HD) HCCI engine operation at practical loads and speeds presents numerous technical challenges. Successful expansion of the HCCI operating range to include the full range of load and speed must be accomplished while maintaining proper combustion phasing, control of maximum cylinder pressure and pressure rise rates, and low emissions of NOx and particulate matter (PM). Significant progress in this endeavour has been made through a collaborative research effort between Caterpillar and ExxonMobil.
This paper evaluates fuel effects on HCCI engine operating range and emissions. Test fuels were developed in the gasoline and diesel boiling range covering a broad range of ignition quality, fuel chemistry, and volatility. All fuels were evaluated in a Caterpillar 3401E Single Cylinder Oil Test Engine (SCOTE) under HCCI conditions. Exhaust emissions and engine performance were measured as a function of key engine variables, including engine speed, amount of exhaust gas recirculation (EGR), and fuel injection timing. The results show that the proper combination of fuel quality and engine conditions can achieve heavy-duty HCCI operation over a broad load range while realizing significant emission reductions. At the 12:1 engine compression ratio (CR) tested, it was found that fuels with ignitability intermediate between current gasoline and diesel fuels provided the maximum high load operability.

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

Operating a Heavy-Duty Direct-Injection Compression-Ignition Engine with Gasoline for Low Emissions

2009-01-1442

View Details

TECHNICAL PAPER

Advantages of Fuels with High Resistance to Auto-ignition in Late-injection, Low-temperature, Compression Ignition Combustion

2006-01-3385

View Details

TECHNICAL PAPER

Partially Pre-Mixed Auto-Ignition of Gasoline to Attain Low Smoke and Low NOx at High Load in a Compression Ignition Engine and Comparison with a Diesel Fuel

2007-01-0006

View Details

X