The Impact of Driving Resistances on the Emission of Exhaust Pollutants from Vehicles with the Spark Ignition Engine Fuelled with Petrol and LPG

One of the important factors affecting exhaust emissions of car engines is driving resistance. A certain problem during the tests bench according to the driving cycle is the road load curve function, which is determined based on various methods. In the paper, the results of studies of the impact of the driving resistances on the exhaust gas emissions of CO (carbon monoxide), CO₂ (carbon dioxide), THC (total hydrocarbons), NO_x (nitrogen oxides) emitted by passenger cars with a SI engine, fuelled with petrol and LPG were presented. Tests were carried out in chassis dynamometer for road load coefficient determined by the road method and for type approval alternative method. The research was realized for NEDC (New European Driving Cycle) cold start tests for EURO 3 and EURO 6 standards vehicles. Results show that CO₂, CO and THC emissions for tests realized by dyno settings based on road load are higher than for tests with dyno settings by the alternative method of the load. Therefore, it is important that during the emission tests on the chassis dynamometer, the values of resistance force based on road tests are adopted.