Riassunto analitico
This work presents an analysis and evaluation of the NOx emissions generated by a diesel engine powered light commercial vehicle. With the help of AVL Italia, several Real Driving Emissions test cycles are performed either on a chassis dynamometer or directly on the road under different conditions. The main objective is to evaluate if current diesel engines and exhaust aftertreatment systems have the capability to comply with current, extremely restrictive, emission regulations. Initially, two different operating modes are prepared to enable the engine to modify its combustion characteristics, with the goal of having a direct effect on the temperatures of the aftertreatment system. The setpoints that control the switching between modes have a critical impact on final emission results. The negative effects of different parameters such as vehicle payload, driving dynamics, and ambient temperature on NOx emissions are controlled in a robust way with the calibration of exhaust aftertreatment system temperature setpoints. Test results are confronted against some of the most restrictive emission regulations of actuality, showing an excelling performance of the vehicle that provides a positive view towards homologation.
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