Tail-pipe NOx emissions Euro VI buses in daily operation in the Netherlands
report
In the framework of the in-service testing programme for heavy-duty vehicles for the Ministry of Infrastructure and Water management, the nitrogen oxide emissions (NOx) of five Euro VI busses for public transport were measured during real-world operation during everyday’ s use with the Smart Emissions Measurement System ‘SEMS’ [TNO 2016a]. Each measurement on a bus represents a different situation at a different public transport operator. Furthermore, the NOx emissions of two Euro VI buses have been extensively measured with the Portable Emissions Measurement System ‘PEMS’. This system is prescribed for type approval and in-service conformity testing of emissions, but can be used for non-formal emissions testing as well. All seven buses have a first generation Euro VI diesel engine with an SCR catalyst for the reduction of the NOx emissions and a diesel particulate filter for the reduction of the particulate matter emissions of the diesel engines. The engines of the seven busses tested, represent 64% of the Euro VI engines types in public transport buses registered in the Netherlands beginning 2018. Result of the measurements is that for the seven different situations the average NOx emissions varied during normal operation between 0.3 g/km to 2.9 g/km and from 0.2 to 1.9 g/kWh. For three out of the seven situations the average NOx emissions were higher than the limit value for the official European on-road emissions test for heavy-duty vehicles and engines. It must be noted that the limit value is applicable for the conditions that are prescribed for the formal European on-road bus test with PEMS2.
TNO Identifier
843418
Publisher
TNO
Collation
33 p.
Place of publication
Den Haag