Ecotraffic have on behalf of Trafikverket carried out emission tests on 4 Euro 6 vehicles with respect to Real Drive Emissions (RDE). The cars represent 4 different Euro 6 technologies. 1. VW Passat – Euro 6 – diesel This car use a technology named DeNOX or (LNT). NOX is trapped in the catalyst and reduced to nitrogen gas by use hydrocarbons (diesel fuel) as reducing agent. This car is also equipped with diesel particle filter. 2. VW Passat – Euro 6 – diesel This car use a technology named SCR (Selective Catalytic Reduction) there NOX is reduced to nitrogen gas by using urea (trade name adblue) as reducing agent. This car is also equipped with diesel particle filter. 3. Mazda 6 – Euro 6 – diesel This car do not use a trap or catalytic reduction. The main technology used for decreasing the concentration of NOX in the exhaust gases is EGR (Exhaust gas reduction). This car is also equipped with diesel particle filter. 4. Mercedes A 180 – Euro 6 – gasoline This car use a three way catalytic converter in combination with a lambda sond to control the exhaust gases. The engine is of the type direct injection (DI). Read more about the different technologies in chapter Conclusions. The cars have been tested according to the test cycles below: - NEDC at + 22°C. - WLTP at + 22°C. - WLTP at – 7°C. - WLTP at – 15°C. All tests were carried out during the second half of 2015 at TÜV NORD’s emission laboratory in Essen, Germany. By comparing emissions measured from the tests we can draw these conclusions: Generally conclusions are that NOX is a problem for diesel powered passenger cars and emission of small particles (high number) is a problem for gasoline cars. - Tests outside the NEDC cycle (certification condition) show much higher NOX emissions compared to the Euro 6 limit. - Higher HC emissions for the DeNOX system (especially at WLTP test cycle) compared with SCR - Increased fuel consumption with decreased ambient temperatures for all cars tested. - High NOX emissions at low ambient temperatures (especially at WLTP test cycle) for all tested diesel cars. - The SCR system seems to have lower NOX emissions than the DeNOX system. - Almost all emitted NOX consists of NO – most significant for the gasoline car. - Relatively low particle emissions (both mass and number) for all tested diesel cars. - Relatively high numbers of particles from the gasoline cars but the car met the Euro 6 limit. - These measurement clearly show that filters are very efficient in reducing the number of particles emitted.