Emission Optimization Approach to Meet the Current Indian Emission Norm Without EGR Cooling for a Vehicle Equipped with Common Rail Diesel Engine

摘要

In India, diesel engine powered vehicles are finding rising demand due to the subsidy offered on diesel. Currently, BS-IV emission norm (equivalent to E-IV in Europe) is in existence. To meet this emission norm, OEM look for improved engine design, use of common rail injection system, advanced after treatment. In the current article, a methodology is demonstrated by which the required emissions on multipurpose vehicle (MPV) powered with 2.2L common rail injection system was met with no need of EGR cooling. This was achieved by identifying the operating points from the BS-IV emission cycle where EGR cooling is beneficial. The next step involves assessing the loss of function due to its removal. The final step involves strategies which can bring the original optimized value of NO_x-PM. Removal of EGR cooling avoids the cooling of intake charge and reduces the HC and CO emission. Also, it gets rid of complication in the under bonnet packaging and leads to maintenance free operation. This resulted in overall reduction of the precious metal loading on the catalytic convertor by 50% from its value in the production. Thus, the overall cost saving of 3.5% of the total engine cost was achieved without losing the functional requirement.