Browse Publications Technical Papers 2006-01-2995
2006-09-14

Knock Resistance in a Small Turbocharged Spark-Ignition Engine 2006-01-2995

Spark-ignition engines are characterized by poor levels of thermal efficiency, it is known, especially when running at partial load.
Since part-load operating points are the most commonly used in engine average life, achieving a given torque value with small displacement, high mean effective pressure engines, the so-called “downsizing”, permits, in general, to limit some typical engine losses (for instance: pumping and friction losses), improving the fuel consumption in a wide range of engine operating points.
Small displacement engines, usually, achieve high toque values thanks to supercharging techniques.
In this paper, knock risks for a small displacement turbo-charged spark-ignition engine have been analyzed. A parametric analysis of numerous variable influencing engine performance and knock resistance has been carried out by means of 1-D numerical simulations.
At low engine speed, the influence of inlet valve close angle on engine octane requirement has been assessed for different values of the turbocharging pressure ratio.
Computations have been performed by means of the 1-D AVL Boost code. Initial and boundary conditions have been evaluated by experimental tests.
The model utilized in this study has been validated by comparing the obtained results to the measured data provided by the research center of the engine manufacturer.

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 Visualization Study of Liquid Fuel Distribution and Combustion Inside a Port-Injected Gasoline Engine Under Different Start Conditions

2000-01-0242

View Details

TECHNICAL PAPER

Engine Braking: A Perspective in Terms of Brake Power

2019-26-0288

View Details

TECHNICAL PAPER

Analysis of Stick-Slip Noise of Piston Ring

940694

View Details

X