This paper presents an analysis of THC, NMHC, CO, NOx and CO2 emissions during\ntesting of two bi-fuel vehicles, fuelled with petrol and gaseous fuels, on a chassis dynamometer\nin the context of the Euro 6 emissions requirements. The analyses were performed on one Euro\n5 bi-fuel vehicle (petrol/LPG) and one Euro 5 bi-fuel vehicle (petrol/CNG), both with SI engines\nequipped with MPI feeding systems operating in closed-loop control, typical three-way-catalysts\nand heated oxygen sensors. The vehicles had been adapted by their manufacturers for fuelling\nwith LPG or CNG by using additional special equipment mounted onto the existing petrol\nfuelling system. The vehicles tested featured multipoint gas injection systems. The aim of this\npaper was an analysis of the impact of the gaseous fuels on the exhaust emission in comparison\nto the emission of the vehicles fuelled with petrol.\nThe tests subject to the analyses presented here were performed in the Engine Research\nDepartment of BOSMAL Automotive Research and Development Institute Ltd in Bielsko-Biala,\nPoland, within a research programme investigating the influence of alternative fuels on exhaust\nemissions from light duty vehicle vehicles with spark-ignition and compression-ignition engines.
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