Technical Paper
Conceptual Design of Small Direct-Injection Spark-Ignition Engine Concepts with Various Injector Positions by Use of CAE-Tools
2012-10-23
2012-32-0066
Within a project of a research association (Forschungsver-einigung Verbrennungskraftmaschinen e.V.) a DI spark-ignition engine with small engine displacement was designed at the Institute of Internal Combustion Engines of the Technische Universitat Braunschweig. The objective of the project is to investigate the minimum bore diameter which allows the reasonable use of the advantages of gasoline direct injection. This article outlines the preliminary studies to identify suitable geometry variants for lateral and central injector position concerning effective engine operating data. Under consideration of current production possibilities and geometries of available injector and spark plug CAD studies were carried out. All suitable valve concepts, beginning with a two-valve (2V) concept and up to a four-valve (4V) concept, were examined in the CAD studies. The bore diameter was varied in a range from 56 to 62 mm combined with a variation of the stroke/bore ratio from 0.9 to 1.2.
