On-road emission measurements with PEMS on a Mercedes-Benz Atego Euro VI N2 heavy-duty truck
van Gijlswijk, R.N.
van Goethem, S.
Commissioned by the Ministry of Infrastructure and Water management of The Netherlands, TNO Sustainable Transport and Logistics regularly performs measurements on heavy-duty vehicles to determine the in-service performance and durability of the tail-pipe emissions under representative driving conditions. A Euro VI heavy-duty N2 class truck, the Mercedes-Benz Atego was tested with a Portable Emission Measurement System on the road (PEMS), driving various trips. The gaseous emissions were measured and analysed according to the in-service conformity method (Annex II of 582/2011/EC and amendments). With the standard PEMS protocol adapter no access to CAN/ECU data was possible. Therefore, for all but one test only the CO2 based evaluation method was chosen. Because of the same reason for these test the engine coolant temperature was not available and therefore a warm up time of the coolant had to be assumed for these tests. For one of the tests CAN/ECU data was recorded with a separate device. The data (torque, engine speed, coolant temperature) was used for the work-based evaluation of the given test. It should be noted that the share of the sub-trip part characterized as ‘rural’ is smaller than required for an N2 trip according regulation 582/2011 amended by 64/2012. The test trips are therefore not fully conform the applicable requirements. The conclusions drawn from the measurements with this specific vehicle are as follows: - the Conformity Factor for NOx over an N2 Euro VI trip is high and well above 1.5. - the Conformity Factor for NOx varies differs per trip and varies between 3.4 and 5.8 for trips with a payload of 55%. - the Conformity Factors for CO and HC emission are well below 1.5 for all trips. Generally, for in-service conformity checking, more than one vehicle should be tested and evaluated to determine whether the vehicle type is compliant with the in-service conformity requirements. In this programme only one vehicle was tested and therefore the results are indicative only.
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Mobility & Logistics
Historisch materiaal TNO
TNO 2018 R10053
TNO, Den Haag