Heuser, P., Ghetti, S., Rathod, D., Petri, S. et al., "Bharat Stage VI Solutions for Commercial Engines for the India Market," SAE Technical Paper 2017-26-0043, 2017, doi:10.4271/2017-26-0043.
The Bharat Stage VI (BS-VI) emission legislation will come into force in 2020, posing a major engineering challenge in terms of system complexity, reliability, cost and development time. Solutions for the EURO VI on-road legislation in Europe, from which the BS-VI limits are derived, have been developed and have already been implemented. To a certain level these European solutions can be transferred to the Indian market. However, several market-specific challenges are yet to be defined and addressed. In addition, a very strict timeline has to be considered for application of advanced technologies and processes during the product development. In this paper, the emission roadmap will be introduced in the beginning, followed by a discussion of potential technology solutions on the engine itself as well as on the exhaust aftertreatment side. This includes boosting and fuel injection technologies as well as different exhaust gas recirculation methods. Exhaust gas aftertreatment solutions like SCR only or SCR plus EGR solutions, will also be discussed in addition to advanced engine and aftertreatment models for the electronic control unit (ECU). An analysis of the benefits and challenges of the individual technologies will be presented. Furthermore, advanced calibration tools and methods will be introduced, which help to reduce development time and cost. As a summary, the paper will identify most favorable concepts for future on-road engines.