Browse Publications Technical Papers 2009-01-1441
2009-04-20

Injection Strategy Optimization for a Light Duty DI Diesel Engine in Medium Load Conditions with High EGR rates 2009-01-1441

Further restrictions on NOx emissions and the extension of current driving cycles for passenger car emission regulations to higher load operation in the near future (such as the US06 supplement to the FTP-75 driving cycle) requires attention to low emission combustion concepts in medium to high load regimes.
One possibility to reduce NOx emissions is to increase the EGR rate. The combustion temperature-reducing effects of high EGR rates can significantly reduce NO formation, to the point where engine-out NOx emissions approach zero levels. However, engine-out soot emissions typically increase at high EGR levels, due to the reduced soot oxidation rates at reduced combustion temperatures and oxygen concentrations.
This paper presents an analysis of the effects of varying injection timing, fuel mass distributions in split injections and fuel rail pressure on emissions, combustion noise and fuel consumption during the medium load operation (≥10 bar IMEP) at high EGR rates (41%) of a single-cylinder test engine, with the overall objective to optimize a triple injection strategy. The results of some of the test cases are compared with those obtained from modelling in KIVA-3V.
Using an optimized triple injection strategy, soot and NOx emission levels from the test engine could be reduced to < 0.04 g/kWh and < 0.4 g/kWh, respectively, at the medium engine load of 10 bar IMEP.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 17% 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

Three-Dimensional Computation of the Effects of the Swirl Ratio in Direct-Injection Diesel Engines on NOx and Soot Emissions

961125

View Details

TECHNICAL PAPER

Low Temperature Combustion in a Heavy Duty Diesel Engine Using High Levels of EGR

2006-01-0075

View Details

TECHNICAL PAPER

The Effect of Post Injection Coupled with Extremely High Injection Pressure on Combustion Process and Emission Formation in an Off-Road Diesel Engine: A Numerical and Experimental Investigation

2019-24-0092

View Details

X