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Adopting the Features of Digital Rate Shaping (DRS) with Multiple Injections Strategy on Small 2 Cylinder Common Rail BSVI Engine to Improve FE
Abstract:
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) and injection control that benefits not only the engine combustion performance but also enables smarter thermal management of modern exhaust systems while meeting stringent emission compliances and achieving future CO2 reductions goal.
Initial DRS developments were tried with a dwell period up to 800us-500us with limitations over injector durability. Later with the advances in FIE technology the dwell periods could further be reduced to 500us-200us. The recent technologies developed are capable of reducing dwell period -100us or further lower within the boundary conditions of system application limits.
In this paper, an experimental study on the application of multiple injections coupled with an intelligent adoption of such DRS features are 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 the selected load collective points (in part load engine operating zones identified from vehicle driving cycle) shown benefit over conventional CRS (non DRS) technology.
Results show that, DRS strategy improves overall engine BSFC by 4.3% without having any additional friction reduction or energy saving gazettes on engine.
The MIDC emission test results with this strategy shows a reduction in CO2 emissions and fuel consumption by -4% over conventional strategy.