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Abstract Exhaust gas recirculation (EGR) is a known method of reducing nitrogen oxides (NOX), but the impact of its deactivation on emissions has not been quantified. This paper, therefore, considers the impact of deactivating the EGR valve on NOX emissions in a diesel Euro 5 vehicle. The measurements were performed during nine driving cycles and in all cases, a significant increase in NOX emissions was found when the EGR valve was deactivated. NOX emissions increased between 176% and 407%, depending on the cycle driven. Measurement results indicate the origin of significant amounts of NOX emissions. Recommendations are to inform regulatory authorities about the effects of such manipulations in order to adopt more stringent measures and introduce them during periodic technical inspection of vehicles with the view to preventing such interventions.
Increase in nitrogen oxides due to exhaust gas recirculation valve manipulation
2022-01-01
Article (Journal)
Electronic Resource
English
Nitrogen oxides , Emission factor , Exhaust gas recirculation , Chassis dynamometer , Driving cycle , COPERT , computer programme to calculate emissions from road transport , CVH , Centre for Vehicles of Croatia (Cro. Centar za vozila Hrvatske) , DEF , diesel exhaust fluid , DPF , diesel particulate filter , ECE , Economic Commission for Europe , EEA , European Economic Area , EF , emission factor , EGR , exhaust gas recirculation , EMEP , European Monitoring and Evaluation Programme , EUDC , extra-urban driving cycle , FAP , particle filter (Fr. filtre à particule) , HDDV , heavy-duty diesel vehicle , NEDC , New European driving cycle , NO<inf>X</inf> , nitrogen oxides , OBD , on-board diagnostics , PTI , periodic technical inspection , RPM , revolution per minute , SCR , selective catalytic reduction
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