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BSIV implementation for commercial vehicle in pans India effectively from April 2017. It’s very challenging job for performance and emission engineer to meet engine performance & fuel economy with stringent emission norms for high power and torque density HD diesel engine. In Altitude, lack of air availability & combustion energy passes by mechanical waste gate, lead to lower boost at partial load in waste gate region; which in turn leads to poor engine performance & fuel efficiency and higher turbo speed. To control the turbocharger design speed limit various methodologies adopted like engine derating or optimizing the combustion parameters leads to poor vehicle performance. Combustion parameter optimsation is having limited scope for turbocharger speed control.

Nowadays technology is changing day by day and so as the expectation of the customers. Customers relate their vehicle and their reputation. Smoke coming out of vehicle affects badly on the reputation of the customer that is why today’s customer wants smoke free vehicle during transient condition. Low Air Fuel Ratio leads to smoke due to rich combustion mixture. Smoke could be generated due to turbo leg, sudden acceleration, gear changing, cold condition, altitude etc. During sudden acceleration, turbo leg leads to rich mixture which is favourable condition for smoke generation. It is difficult to reduce turbo leg in waste gate type turbocharger while maintaining EGR requirement in EGR based Engine. Smoke can be optimized by controlling fuelling in sudden acceleration or in transient condition. However it might adversely affect on vehicle pick up and could improve fuel economy.