Abstract
In the Russian Federation, unlike the European countries, where the Euro-6 standard is in effect and introduction of Euro-7 is expected until 2025, the Euro-5 standard has been adopted and the possibility of introducing Euro-6 is only being formed, but the production and technical infrastructure of the service is not ready for this. The article defines the main parameters characterizing the qualitative and quantitative difference of the fuel-air mixture and their effect on the output parameters of exhaust gas toxicity, examines in detail the areas of change in toxicity parameters when varying the main operating modes of the engine, analyzes the maximum and minimum values of toxicity parameters and possible areas of their displacement in case of changing the technical condition of engine systems. As a result of theoretical studies, it was revealed that concentration of toxic components of exhaust gases before entering the converter may be several times different from mode to mode. Such operation at the limit of the maximum degree of conversion of the catalytic converter accelerates its aging, leads to the loss of operational properties and, as a result, to deterioration in the environmental safety of the car.
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