The diploma thesis identifies and analyzes increased emissions of certain pollutants while driving a bi-fuel vehicle on the road when using petrol and CNG using new test cycles and procedures adopted by the European Union in order to reduce the gap between emissions measured on homologation tests and between real driving emissions. At the same time it examines the potential for reducing pollutant emissions with the use of alternative gaseous fuel CNG. Emissions were measured using PEMS by mimicking the WLTC cycle on the road and on standard and extended RDE test drives. We have concluded that the implementation of novelties will positively contribute to the approximation of the homologated emission values to the actual ones. The comparison of emissions between both used fuels under similar operating conditions have shown that, when using CNG, the vehicle emits smaller amounts of CO2, CO and THC and a higher amount of NOx into the atmosphere. In a detailed analysis of instantaneous emissions, a measurement error was detected in the measurements of CO emissions when using CNG. The diploma thesis gives a possible explanation of the occurrence of a measurement error with interference of CO and N2O infrared absorption bands in a non-dispersive infrared sensor (NDIR).
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