Abstract
Extensive research has been dedicated towards identifying the sources of pollution and the ways and means of mitigating the emission levels to save our planet from alarmingly high pollution levels. It is not exaggeration to say that the petroleum run engines are one of the major contributors to this high pollution levels. For meeting stringent emission legislation, engine has to be optimized for lower emission with better performance. In the recent years, more work is being carried out to reduce NOx emissions from the diesel engines. The present work deals with the development of variable injection cam and the optimization of DI automotive 510cc engine incorporated with VIC (Variable Injection Cam) and the engine performance is studied both analytically and experimentally. Also, it is well established that by diluting the incoming charge with exhaust gases (with EGR technique), the NOx emission could be significantly reduced. A comparison was also made with VIC and EGR and their combined effect on the performance as well as on emissions. The performance is analytically studied with combustion pressure and heat release data. It is observed that the combined effect of VIC and with 7% EGR could reduce CO by about 88%, HC+ NOx by 37% and PM by 90%. The Engine was successfully upgraded to meet proposed Bharat Stage -III emission norms with the combination of VIC and EGR with improved power and fuel consumption
Keywords: Power Unit, Variable Injection Cam, IDC, Emission, EGR.