Scientific paper ID 1943 : 2020/3

Environmental as well as economical issues provide a compelling impetus to develop clean, efficient, and sustainable vehicles for urban transportation. Environmental and economical advantages can also be gained by applying the alternative transportation technologies to industrial and commercial off-road vehicles. Passenger vehicles constitute an integral part of our everyday life, yet the exhaust emissions of the conventional internal combustion engine (ICE) vehicles are the major source of urban pollution that causes the greenhouse effect, which in turn leads to global warming [1]. The hybrid electric vehicles (HEVs) or simply hybrid vehicles use both electric motors (EM) and an ICE for delivering the propulsion power, these vehicles have lower emissions compared to a similarly sized conventional ICE vehicle, resulting in less environmental pollution. The ICE used in a HEV is, of course, downsized compared to an equivalent ICE vehicle. The ICE in combination with the EM and an energy storage unit (battery B) provide an extended range for HEV and bring down pollution. The hybrid vehicle serves as a compromise for the environmental pollution problem and the limited range capability of today”s purely electric vehicle. The HEV energy efficiency is the main factor for its advantage and evaluating. This paper considers the method for determining the HEV energy efficiency in urban transportation.