Browse Publications Technical Papers 2001-01-3553
2001-09-24

The Effect of Valve Lift Shape and Timing on Air Motion and Mixture Formation of DISI Engines Adopting Different VVA Actuators 2001-01-3553

A number of Variable Valve Actuators (VVA) has been recently proposed to improve the performances and the part load efficiency of spark ignition engines. Due to their peculiarity, these systems work with different strategies (late or early inlet valve closing, reduced lift etc.).
The shape and the timing of the valve lift affect not only the pumping losses, but also air motion inside the cylinder. That influences mixture formation and combustion evolution of Direct Injection Spark Ignition (DISI) engines.
The present paper compares the performances of different VVA systems with the aid of a 1D code for the simulation of the inlet and of the exhaust phases, and of a fluid-dynamic 3D code to evaluate mixing phenomena inside the cylinder.

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

Measurement and Simulation of Turbulent Flame Propagation in a Spark Ignition Engine by Using Fractal Burning Model

2001-01-3603

View Details

TECHNICAL PAPER

Impact of Tumble on Combustion in SI Engines: Correlation between Flow and Engine Experiments

2007-01-4003

View Details

X