Adopting the features of Digital Rate Shaping (DRS) with Multiple injections strategy on small 2 Cylinder Common Rail BSVI engine to improve FE

The Common Rail Fuel Injection System (CRS) has completely changed the whole diesel engine combustion cloud dynamics and enhanced the applicability of diesel engines further with a motto of providing a more cleaner sky and greener earth. The most cutting-edge technological developments made in CRS and EGT system enables OEMs to achieve further more stringent emission norms and adopt the environmental protection compliances. Today’s CRS systems are the most advanced generation fuel injection systems providing further high injection pressures, wide multiple injections capability with shorter dwell periods enabling real smoother Digital Rate Shaping (DRS) benefits and Smart thermal management of exhaust systems while meeting stringent emission compliances and achieving future CO2 reductions goal. Initial DRS I system developments were tried with a dwell period up to 500us-800us due to injector durability life limitations. DRS II system is such an advanced system developed in recent years having potential of reducing dwell period less than 200us. In this paper, an experimental study on the application of multiple injections coupled with intelligent adoption of DRS II features were studied on 2 Cylinder Common Rail BSVI engine in order to improve engine part load BSFC performance and on road FE in vehicle city driving conditions. Preliminary DoE trials conducted on engine test bed for selected load collective points and part load engine operating zones identified from vehicle driving cycle shows benefit over conventional CRS and DRS I technology. Results show that, DRS II strategy improves overall engine BSFC by 4.5% without having any additional friction reduction or energy saving gazettes on engine.The FE is also found to be improved in on road vehicle driving conditions by more than 3%. The MIDC emission test results with this strategy shows reduction in CO2 emissions and fuel consumption.