In-use emissions testing of diesel-driven buses in Southampton: is selective catalytic reduction as effective as fleet operators think?

摘要: Despite the continuously tightening emissions legislation, urban concentrations of nitrogen oxides (NO x ) remain at harmful levels. Road transport is responsible for a large fraction, wherein diesel engines are principal culprits. Turbocharged have long been preferred in heavy duty applications, due to their torque delivery and low fuel consumption. Fleet operators under pressure understand control vehicles, yet performance abatement technology real-world driving largely unquantified. The most popular NO x vehicles selective catalytic reduction. In this work, authors empirically determine efficiency factory-fitted reduction (SCR) system by instrumenting passenger buses with both portable measurement custom-built telematics unit record key parameters from vehicle diagnostics systems. They find that even relatively favourable conditions, while there some improvement use SCR, operate far design targets. archival value study quantification real world versus levels factors discrepancy, as well examination technologies reduce difference.