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These day diesel engines are gaining lots of attention as prime movers for  various source of transportation. It offers better drive ability, very good  low end torque and importantly the lower CO2 emission. Diesel engines are  bridging the gap between gasoline and diesel engines. Better noise vibration  and harshness levels of gasoline engine are realized to great extent in  diesel engine, thanks to common rail direct injection system. Common rail  injection system is now well known entity. Its unique advantage is flexible  in operation. In common rail injection system, number of injection prior and  after main injection at different injection pressure is possible. Due to  multiple injections, gain in emission reduction as well as noise has been  already experienced and demonstrated by researcher in the past. However,  stringent emission norms for diesel engine equipped vehicle demands for  further lower emission of oxides of nitrogen (NOx) and particulate matter  (PM). In the present paper, authors attempted to study the effect of multiple  injections in combination with two level of compression ratio. The aim was to  study the combustion behavior with the reduced compression ratio which is  going to be tried out as low temperature combustion concept in near future.  The results were compared with the current level of compression ratio.  Experiments were carried out in 2.2L cubic capacity engine with two levels of  compression ratios. Pilot injection separation and quantities were varied  keeping the main injection, rail pressure, boost pressure and EGR rate  constant. Cylinder pressure traces and gross heat release rates were measured  and analyzed to understand the combustion behavior

Investigations of effects of pilot injection with change in level of compression ratio in a common rail diesel engine