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Turbocharged common rail direct injection engines offer multiple benefits compared to their naturally aspirated counterparts by allowing for a significant increase in the power and torque output, while simultaneously improving the specific fuel consumption and smoke. They also make it possible for the engine to operate at a leaner air/fuel mixture ratio, thereby reducing particulate matter emission and permitting higher EGR flow rates. In the present work, a two cylinder, naturally aspirated common rail injected engine for use on a load carrier platform has been fitted with a turbocharger for improving the power and torque output, so that the engine can be used in a vehicle with a higher kerb weight. The basic architecture and hardware remain unchanged between the naturally aspirated and turbocharged versions. A fixed geometry, waste gated turbocharger with intercooling is used.

Stringent emission regulations on one hand, and increasing demand from the customer for better drivability, NVH and fuel economy on the other, call for the adoption of advanced common rail technologies even in the commercial vehicle segment that is typically dominated by mechanically governed engines. Common Rail Direct Injection has traditionally been the forte of the passenger car and Sports Utility Vehicle (SUV) segment, and the benefits have been accorded to the premium segment users. The present work is undertaken in an attempt to downsize larger common rail direct injection engines for use on a 0.85 tonne load carrying platform, bringing the advantages of this technology to a wider section of users, while keeping the cost at a comparable level with mechanically governed engines. This work describes the strategies adopted to accomplish the performance targets on a 0.9l two cylinder naturally aspirated common rail engine.