Tailpipe emission study of aged after treatment system on Medium duty commercial vehicle

As the emission norms are getting stringent in BSVI and regulations like OBD-II on vehicle. It is essential to define the life of exhaust after treatment along with the vehicle. The After treatment mainly consist DOC+DPF+SCR. Lubricating oil consumption is always be there with engine running condition and these additive oils contains phosphorus or zinc which gives an adverse effect on DOC and there is unburnt hydrocarbon (UNHBC), SOF in tail pipe that get accumulated in DPF which further require regeneration means a higher temperatures in exhaust after treatment (EATS ) and as the regeneration count increases there is ash accumulation in DPF that reduces its capability for soot accumulation. The tail pipe emission also consist Sulphur which has a negative impact on SCR for Nox conversion. So in present study we analyze the effect of (1) Chemical aging (2) Thermal aging on 3.77 liter diesel engine after treatment. A test cycle was prepared to run durability for EATS which consist total normal running hours and also cumulative regeneration hours to analyze both chemical and thermal aging impact on EATS. The results shows the impact on DOC in terms of HC slip at DOC out, total ash accumulation in DPF and SCR conversion efficiency and Nh3 slip with same dosing level , at different running hours so that the safest life span can be calculated.