Browse Publications Technical Papers 2019-26-0033
2019-01-19

Cost Effective BS-VI Solution- A Combined Low Temperature Combustion and Conventional Diesel Combustion Concepts 2019-26-0033

Air Pollution in India and also global warming are major concern. In this situation, India is moving from BS-IV to BS-VI for on-road applications with 90% reduction in NOx and 50% in PM with limit of particulate number. Also moving to Trem-IV and Trem-V for off-road applications subsequently. It needs higher efficiency aftertreatment systems like SCR and DPF. Addition of these complex after-treatment system almost doubles the cost of diesel power plant with heavy penalty on fuel economy. Hence, it is challenge to auto industry to reduce the complexity and cost, so that it requires an alternate solution to reduce NOx and PM emissions at source to reduce cost and system complexity. Low temperature combustion (LTC) is a potential concept to reduce the NOx and PM emissions simultaneously. LTC was experimentally demonstrated on engines of passenger car and light commercial segments, but not much work carried out for heavy duty engines. The current research work focused on development of LTC concept to reduce both NOx and PM emissions to a greater extent with fuel efficiency improvement so that aftertreatment system cost and complexity will be reduced to a great extent for BS-VI norms. Extensive simulation work carried out in this research for selecting the engine features such as CRDI system, combustion package and air handling system suitable to run the engine on both LTC and conventional modes. Engine was built with all modified features and experiments were performed as per BS-VI cycles (WHSC and WHTC). Experiments carried out over entire engine operating zone with smooth transition between LTC mode in part loads and conventional combustion mode in high load zone. Cycle engine out emissions reduced up to 2.3 g/kWh NOx and ~0.03g/kWh PM with 5% overall cycle BSFC improvement. The lowest BSFC noticed during experiments was close to 200 g/kWh. Achieved engine out emissions reduce the aftertreatment complexity, size and cost significantly. Utmost important is reduced engine out emissions and improved fuel economy which reduces aftertreatment system cost & complexity, operating cost, maintenance cost and improved field performance with increased regeneration intervals. This result in lower urea and fuel consumption. In summary, LTC is a cost effective solution for BS-VI.

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