Ecological impact of CNG/gasoline Bi-fuelled vehicles

Abstract

The paper presents the results of an investigation carried on the potentiality of CNG as an alternative fuel for retrofitted gasoline engine analyzing its impact on exhaust gas emissions. In that case the results from emission testing of DACIA Logan on a chassis dynamometer MD-1750 are presented and discussed. The tests were realized at different testing conditions (idling, IM-240 cycle, 50 and 90 km.h-1) to see the influence on regulated and unregulated emissions. The analysis of the obtained experimental results has shown rapid increase of HC and NOx emissions and reduction of CO and CO2emissions, when fuelled with CNG compared to gasoline.