Evaluation of the real-time de-NO_x performance characteristics of a LNT-equipped Euro-6 diesel passenger car with various vehicle emissions certification cycles

Advanced nitrogen oxides (NO_x) after-treatment systems for diesel cars are effectively reducing tailpipe NO_x emissions in laboratory test cycles; however, some de-NO_x systems showed limitation for passing environmental standards during real-world driving conditions. In this study, the NO_x concentration of a lean NO_x trap (LNT)-equipped diesel engine were investigated over various vehicle certification cycles. The LNT performance was compared to the new European driving cycle (NEDC), world-harmonized light-duty vehicle test cycle (WLTC), federal test procedure (FTP)-75, highway fuel economy test (HWFET), and US06. The real-time NO_x concentration behaviors were tracked using NO_x sensors at the engine-out and downstream of the LNT to determine the NO_x storage and regeneration phase. The NO_x conversion efficiencies were 36.3–71.7% of which reflecting the mode severity and cycle duration of the diesel engine. The tailpipe NO_x emissions were 0.059 g/km during the NEDC which was within the Euro-6 emissions regulations. The NO_x emissions in the WLTC, FTP-75, and US06 modes were approximately 1.9, 1.5, and 6.6 times higher than the NEDC due to the higher frequency of LNT purge and higher engine-out NO_x formation. During the diesel particulate filter (DPF) regenerating stage in WLTC mode, tailpipe NO_x emissions substantially increased by more than 8.8-fold. The exhaust gas recirculation (EGR) supply and lambda control scheme were closely related with strong NO_x increment at de-NO_x and de-PM processes.