Exhaust gas measurements of a passenger car under real-world driving conditions

In the framework of the MOBINET-project, dealing with mobility in cities, a passenger car was equipped with on-board exhaust gas measurement devices. In the city of Munich more than 20 hours of measurements of limited exhaust components were conducted. It is shown that the driving parameters velocity and velocity times acceleration observed in real-world-driving are not reflected by common driving cycles of chassis dynamometers. Comparison of measured exhaust figures with simulations by the state-of-the-art model COPERT III revealed discrepancies of up to one order of magnitude. These discrepancies are most important to nitrogen oxides. Emissions of nitrogen oxides can be reduced by measurements of traffic jam prevention more efficiently than hydrocarbons and carbon monoxide, which are emitted mainly during cold starts.