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In meeting the stringent emission norms the injector selection plays a vital role. Selection of optimum injection parameters helps in achieving good spray targeting and efficient atomization of fuel to generate optimum mixing effect. The purpose of this experimental study is to investigate the effect of injection parameters on a heavy duty diesel engine performance and emission characteristics. The injection parameters such as hydraulic through flow, cone angle, number of holes & hole diameter are studied on 6-cylinder turbocharged common rail diesel engine (BS-IV). The influence of these parameters and their combinations along with the various injection strategies are analyzed using different parametric variations in order to see the combustion and performance trend of engine. The performance of the various hardware configurations are then evaluated and discussed based on the fuel consumption and exhaust emission values.

SCR being an advanced active emission technology system for diesel engine, is one of the most cost-effective and fuel-efficient technologies available for complying with the stringent NOx emission legislations. SCR catalyst volume is being considered as the most concerned part for NOx reduction and durability and a key element leading to high financial assessments. The SCR Optimization reduces the possibility of ammonia slip and leads to high NOx conversion rates. By improving the performance of the SCR, the optimization solution also reduces the amount of catalyst needed, thereby reducing associated costs. The decrease in SCR catalyst volume by 1m3 with respect to current set-up will lead to 15% reduction in the total cost of catalyst. All the factors affecting the SCR catalyst volume were focused in detail and the plausible range of catalyst volume was investigated by comparative measurement of these factors.