METHODOLOGICAL APPROACHES TO CONTROL HC AND CO EMISSIONS DURING COLD CONDITIONS
2022-01-0544
03/29/2022
- Event
- Content
- Diesel Engines are known for its low fuel consumption and at the same time for higher emission formation (NOx, HC, CO and SOOT). Meeting Emission and CO2 targets simultaneously become tough challenge for the Combustion Engineer. HCCI and PCCI combustion concepts allow the reduction of NOx and Soot simultaneously to very low levels with help of Exhaust gas re-circulation (EGR) while maintaining the CO2 emissions advantage of a diesel Engine But due to the low Combustion temperatures, HC and CO will rise drastically, especially when the catalyst bed temperature is not enough to reach light-off temperature to initiate the after-treatment process. This condition will become serve in Lower Engine temperatures (Cold condition) due to the heterogeneous nature of Diesel Combustion and also affects the BSFC of an Engine. At first multiple injection strategies (Pilot quantity and Pilot separation) has been studied to control both HC and CO by increasing the global combustion temperature. In addition to this high-pressure loop with by-passed cooler has been implemented in cold condition to improve the thermodynamic conditions in the cylinder to reduce HC and CO in low load conditions. At vehicle level Diesel oxidation catalyst (DOC) loading has been optimized to control the HC and CO emission in cold condition. The increase in complexity of combustion process requires study and understanding of in-cylinder combustion process. This paper deals with the optimal selection of EGR quantities, Main injection timing, Rail pressure, Pilot separation and Pilot quantities based on the several iterations done at Engine test bed along with the In-cylinder pressure and ROHR studies. Finally, a methodological way has been established and proposed, to optimize the Engine for both Emissions and Fuel economy
- Citation
- Mutta, S., "METHODOLOGICAL APPROACHES TO CONTROL HC AND CO EMISSIONS DURING COLD CONDITIONS," SAE Technical Paper 2022-01-0544, 2022, .