Investigation of the effects of a passenger car's first idle time and environmental conditions on real driving emissions

Internal combustion engines are one of the major factors of global warming, as they emit harmful emissions such as CO2, CO, HC and NOX. Therefore, the regulations on CO2 and other exhaust emissions for vehicles are gradually being tightened in all countries, and different test procedures are applied to reduce global warming. In this study, exhaust emissions of the spark ignition engine are measured by using the portable emissions measurement system and compact exhaust gas analyzer for the vehicle used in tests carried out according to Real Driving Emission procedures to reach sustainable environmental future. The effects of the ambient temperature in which the vehicle is kept before starting and the time from starting the vehicle's engine to the moment of first departure on the exhaust emissions released along the test route were investigated. The reductions in CO, THC and NOX emissions along the test route by increasing the initial idle time were found to be approximately 23%, 45% and 66.5%, respectively. With the effect of increasing the ambient temperature, better emission values are obtained during the test. In the tests carried out along the determined route, it was observed that the first idle time of the engine and the increase in the ambient temperature in which the vehicle was kept reduced the emission values.