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Simultaneous reduction of NOx and PM from engine exhaust of a diesel engine is an interesting area of research due to the implementation of stringent emission regulations all over the world. Cost involved in expensive after treatment systems such as DPF and SCR necessitate minimization of engine out pollutants. With minimum engine out emission achieved through engine hardware and combustion parameter optimization, possibility of elimination or downsizing of the after treatment system can be explored. The paper presents the effect of fuel injection parameters and EGR rate on exhaust emission of a boosted diesel engine. Effects of parameters such as rail pressure, pilot-post injections, SOI, EGR rate and EGR temperature on a 4 cylinder two valve direct injection diesel engine is studied. Present study reveals the possibility of elimination of after treatment systems at BS IV level with optimization of engine hardware and combustion parameters.

The paper presents the development of a naturally aspirated direct injection diesel engine for multi utility vehicles with a cam driven mechanical fuel injection pump to meet stringent Bharat Stage III norms (akin to Euro III norms). The paper describes the cost effective techniques adopted for the development of a 3 liter DI engine used for multi utility vehicle applications. Inherent design architecture of engine not being contemporary, plus need to achieve targets without turbo charging, intercooling or electronic common rail injection system to keep low product cost, posed major development challenge. Extensive experimental studies have been conducted to evaluate the effect of nozzle configuration, part load retardation, needle tip protrusion, catalytic converter, variable EGR and compression ratio on mass emission of the vehicle. Interaction of swirl and EGR strategy governed through electronic EGR controller has been studied in depth to reach targeted emission norms.

The advent of April 2005 saw the introduction of Bharat Stage-III (akin to Euro-III) norms in 11 major Indian Cities for all class of vehicles and 74 dB(A) vehicle pass by requirement as per EEC homologation norms for M1 class of vehicles across the country. This paper summarizes development methodology investigated and adopted for 3.0 lit direct injection, naturally aspirated diesel engine with cam driven mechanical fuel injection equipment on multi utility vehicle. This lean technical package compared to the trends of using turbocharger, intercooler and electronic common rail system was conceived to meet the requirement of low cost product offering. The base engine was a derivative of commercial vehicle engine with design features posing significant challenge to achieve the impending regulatory requirements.