Browse Publications Technical Papers 2009-01-0653
2009-04-20

Gas Exchange Optimization and the Impact on Emission Reduction for HSDI Diesel Engines 2009-01-0653

The main tasks for all future powertrain developments are: regulated emissions, CO2-values, comfort, good drivability, high reliability and affordable costs.
One widely discussed approach for fuel consumption improvement within passenger car applications, is to incorporate the downsizing effect. To attain constant engine performance an increase of boost pressure and/or rated speed is mandatory. In both cases, the mass flow rate through the intake and exhaust ports and valves will rise. In this context, the impact of the port layout on the system has to be reassessed.
In this paper, the impact of the port layout on a modern diesel combustion system will be discussed and a promising concept shall be described in detail. The investigations shown include flow measurements, PIV measurements of intake flow, CFD simulations of the flow field during intake and results from the thermodynamic test bench. One of the important topics is to prove the impact of the flow quality on the combustion.
Based on these investigations, a new port concept shall be presented, which uses a variable valve lift to provide a highly variable swirl, a homogenous flow field in the cylinder and excellent flow coefficients, in order to increase the volumetric efficiency in combination with reduced flow losses.

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

Turbulence Intensity Calculation from Cylinder Pressure Data in a High Degree of Freedom Spark-Ignition Engine

2010-01-0175

View Details

TECHNICAL PAPER

Investigation of Cylinder Deactivation (CDA) Strategies on Part Load Conditions

2014-01-2549

View Details

TECHNICAL PAPER

Development Process to Optimize Design and Performance of Small Gasoline Engines

2007-32-0093

View Details

X