Browse Publications Technical Papers 2019-26-0152

An Investigation with Mechanical Supercharging as Boosting Solution on Less than 0.5 litre Single Cylinder Diesel Engine Towards Forthcoming Emission Norms 2019-26-0152

Small single & two cylinder diesel engines, still have primitive technical design features and extensively used in India and various Asian countries to power small and light motor vehicles viz., 3-wheeler, light duty 4-wheelers. These vehicles have become inevitable for the transport for both urban and rural areas. Vehicles with small single & two cylinder engines have high market demand in commercial transport due to restrictions on entry of Heavy Commercial Vehicles (HCV) in congested cities roads. Due to ever rising market demand for higher power and torque requirement along with better fuel economy, vehicle manufacturer are developing high bmep engines or replacing single cylinder engine by two cylinder engine, similarly two cylinder engine by three cylinder engines. Further, these engines should meet the present and forthcoming stringent emission limits. Several studies & research work so far conducted on these engine have revealed that, successful turbocharging of single cylinder diesel engine is not yet achieved. This is due to its phase mismatch between intake and exhaust stroke timings, long gap between two exhaust stroke and continuous flow of exhaust gas to drive the turbine wheel efficiently. This paper addresses the problems of single cylinder diesel engine for its future existence by mechanical supercharging approach. For this research work a small 0.4 litre, three wheeler (3W) naturally aspirated, air-cooled, DI diesel engine equipped with mechanical fuel injection system is used. A roots type supercharger driven mechanically from driver pulley directly mounted on crankshaft is used for boosting the engine. Experiments were conducted with various engine parameters settings and different step-up ratios of driver pulley. The experimental outcomes and reviews which are required to arrive at adequate boosting required to enhance the performance of engine & emissions are reported. With the limitation of maximum cylinder pressure for this engine, power with supercharged version is increased in the range of 15%~50% over full load curve. Part load BSFC is improved with supercharged version, more improvement is observed at lower speed. Emission up-gradation from existing BSIII to BSIV achieved with good margin with supercharged version. With modified after-treatment system PM is achieved beyond BSVI emission norms for 3 wheeler vehicle.


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