Limits on downsizing in spark ignition engines due to pre-ignition

Abstract

The combination of gasoline direct injection and supercharging technologies allows the substitution of naturally aspirated engines through downsized supercharged engines with comparable performance. However, increasing the mean effective pressure is limited by the occurrence of unwanted pre-ignition phenomena. The following article provides an insight into the pre-ignition phenomenon and its relevant triggering mechanisms. The presented results stem from a research project by Volkswagen AG Group Research, in cooperation with the Institute for Internal Combustion Engines and Automotive Engineering at Vienna University of Technology.