STUDY OF THE FUEL EFFICIENCY AND ECOLOGICAL ASPECTS OF CNG BUSES IN URBAN PUBLIC TRANSPORT IN BELGRADE

Slaven Tica; Predrag Živanović; Stanko Bajčetić; Branko Milovanović; Andrea Nađ

doi:10.5937/jaes17-17035

Slaven Tica Faculty of transport and traffic engineering
Predrag Živanović Faculty of transport and traffic engineering
Stanko Bajčetić Faculty of transport and traffic engineering
Branko Milovanović Faculty of transport and traffic engineering
Andrea Nađ Teaching assistant

DOI: https://doi.org/10.5937/jaes17-17035

Keywords: Urban public transport, transportation, fuel, ecology, dieseling,

Abstract

This paper investigated the fuel efficiency and ecological aspects of CNG (compressed natural gas) buses in urban public transport in Belgrade. For this study, CNG bus equipped with lean burn combustion and OCs (oxidation catalysts), and diesel bus with EGR (exhaust gas recirculation) - CRT (continuously regenerating technology) were tested on four urban public transport lines (55, 58, 74 and 94). Based on the recorded data regarding bus speed, acceleration, deceleration and mileage, for typical stop distance, driving cycle and its parameters is defined for urban public transport lines in Belgrade. Results of this study showed that under identical conditions on the same lines, average consumption of diesel bus was 12% higher than for tested CNG bus, but average energy consumption was 15.7% lower. Applying ''Student's t - test'' it has been determined that emission of NO_X from tested CNG bus is lower than for diesel bus for 40%, CO₂ for 21.6%, while emission of HC is higher more than ten times.

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