Browse Publications Technical Papers 2002-01-1104
2002-03-04

An Impulse Charging System for SI and Diesel Engines 2002-01-1104

This paper describes the principles, effects and the potentials of impulse charging systems applied to SI and Diesel engines. In general, impulse charging is realized by closing the inlet port upstream of the inlet valve during the intake stroke with an additional switching device. The piston, moving towards bottom dead center, generates a vacuum inside the combustion chamber and inlet port. By opening the switching device abruptly, the sub-atmospheric pressure level induces an enhanced volumetric efficiency due to the significantly increased gas dynamic effects in the intake manifold.
One major advantage of impulse charging in comparison to the well known supercharging techniques lies in the dynamic behavior. The charging effect can be realized within one engine cycle. Furthermore, impulse charging provides high low-end torque, a nearly constant torque over a wide engine speed range with charging rates from 20% to 30%.
The requirements to realize an impulse charging device are high cross sections with minimized flow resistance, extremely fast opening and closing of the switching device, air tightness, and a good timing variability. Measurements performed on a SI engine equipped with an electromagnetic impulse charging device show indicated mean effective pressures higher than 1.4 MPa in an extended engine speed range with the charging effect being realized after one engine cycle.
Additional potentials with impulse charging can be expected by combining this technique with other supercharging systems especially a turbocharger and by using the impulse charger to control flow conditions and exhaust gas recirculation at part load.

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

Development of an Actuator for a Fast Moving Flap for Impulse Charging

2003-01-0402

View Details

TECHNICAL PAPER

Impulse Charging for Diesel Engines: Improved Performance Characteristic and Inside-Engine Measures to Meet Future Emission Legislation

2004-01-1406

View Details

TECHNICAL PAPER

Effects of Cooled EGR Routing on a Second-Generation DISI Turbocharged Engine Employing an Integrated Exhaust Manifold

2009-01-1487

View Details

X