SEMS operating as a proven system for screening real-world NOx and NH3 emissions

NOx emissions of heavy-duty and light-duty diesel vehicles depend strongly on the driving conditions. The introduction of combined emission reduction technologies in Euro VI vehicles have demonstrated that NOx emissions become less predictable when the data is based on relatively short test cycles. Due to the decreased predictability with the...

A smart and robust NOx emission evaluation tool for the environmental screening of heavy-duty vehicles

At the request of the Dutch Ministry of Infrastructure and Environment a smart measurement system was developed to judge the real world NOx emission of heavy-duty vehicles. The measurement system uses a NOx - O2 sensor for the measurement of the tail pipe concentration of NOx and to estimate the tail pipe concentration of CO2 for diesel engines....

CO2 reduction: Is increasing the diesel share the way to go?

Different scenarios have been compared for the future reduction of CO2-emission under real-world driving conditions. A significant shift towards diesel appears hardly to benefit the CO2 but would carry a real NOx penalty. Introduction of DI petrol engines and a shift towards gaseous fuels for s.i. engines would have similar results for CO2,...

Heavy duty test cycles and in-use compliance testing

Measurement procedures for the legal limitation of emissions from heavy duty engines should adequately reflect the actual use of such engines in practice. Equally important is the possibility to monitor the emission performance of certified engines on the market. This paper gives a short overview of the experiences with the Dutch in-use...