Abstract
Emission regulations across the globe are becoming stringent day by day. Seeing the alarming pollution levels across many cities in India, the Government of India has decided to enforce Bharat Stage 6 (BS 6) emission legislation with Modified Indian Driving Cycle (MIDC) by the year 2020 & Real Driving Emissions (RDE) cycle in the next coming few years (13)(19). This has put forward a major challenge for the Indian automotive industry. An RDE cycle represents the actual driving scenarios and therefore is dynamic as well as aggressive in terms of accelerations and transiency compared to the MIDC cycle, Therefore the operation load points are spread across the larger part of the engine map. A Small Commercial Vehicle (SCV) is a unique application having very low power to weight ratios of around 17.5 W/kg. This low power to weight ratio and its typical operational duty cycle involving very high loading on the engine makes the SCV segment unique developing countries like India, where it is used as the last mile connectivity solution in the cities and urban areas. Thus, no solution are directly available which can be implemented for this segment from developed countries, where already strict emission legislations have been implemented. The Exhaust After-Treatment System (EATS) designed for meeting the year 2020-emission requirements with MIDC cycle alone will not be sufficient to meet the requirements of an RDE cycle. India market being a cost driven country, which is very sensitive to both product cost and operational cost, it is mandatory for the automotive industry to come out with an optimized solution with respect to cost as well as emission performance. The work presented here targets to arrive at the most optimum engine and EATS architecture for this SCV segment using simulations and analytical techniques. Making the overall development time and effort lower. The study presented here provides an optimized solution for the Diesel SCV segment to meet the future BS 6 solution with RDE cycle legislation requirements. As first step, an RDE cycle has been developed for the selected vehicle by collecting the parameters in real driving conditions around the Pune city which Page 2 of 26 has been termed as Pune RDE cycle. This cycle has been then utilized in all further simulations performed for this study.