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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), NOx (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.

The reduction in the toxic pollutant emissions in diesel engine exhaust gas is one of the main tasks of designers. Toxic substances emitted in diesel exhaust are, among other things, hydrocarbons. Reducing their emissions can be achieved by affecting the exhaust gases or reducing their formation in the combustion chamber. One method is to change the control parameters of the fuel injection process. In the present study, the direct injection diesel engine with a displacement of 1850 ccm was tested. The diesel engine was equipped with a prototype common rail injection system, allowing for the injection of a fuel quantity divided into three parts during one engine working cycle. Each part can be injected when the injector opens at certain injection advance angles. This results in six different control parameters. Such a number of parameters means a large number of combinations.