Browse Publications Technical Papers 2002-01-0961
2002-03-04

Strategies for High EGR Rates in a Diesel Engine 2002-01-0961

The potential to achieve future NOx targets for a heavy-duty diesel engine with low and high-pressure EGR solutions is controlled by the choice of boosting system. A cycle simulation model representing a current production 6-cylinder truck diesel engine with variable turbine geometry was used to investigate the impact of EGR while maintaining air excess ratio and BSFC.
The disadvantages of the high EGR rates necessary are discussed in terms of increased peak cylinder pressure, compressor work, pumping power and heat rejection requirements. The importance of choosing the correct compressor characteristics for the specific EGR system is demonstrated. Low-pressure systems can achieve EURO 4 limits of 3.5 g/kWh but the increased compressor inlet temperature becomes critical at the high EGR rates necessary for EURO 5. It is possible to reach EURO 5 limits of 2.0 g/kWh NOx with a high pressure EGR loop if the boost characteristics can be extended beyond the current single stage turbocharger to provide greater pressure ratios.

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 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

Experimental Research on EGR in a Diesel Engine Equipped with Common Rail Injection System

2003-01-0351

View Details

TECHNICAL PAPER

W/O Emulsion Realizes Low Smoke and Efficient Operation of DI Engines without High Pressure injection

890449

View Details

TECHNICAL PAPER

Effects of the Intake Charge Distribution in HSDI Engines

2010-01-1119

View Details

X