Effects of driving cycle on CO2 emission of heavy-duty commercial vehicles based on VECTO simulation

Abstract

European has adopted Vehicle Energy Consumption Calculation Tool (VECTO) to calculate the fuel consumption of heavy-duty commercial vehicles for fulfill the carbon-neutral requirement. In this paper, VECTO was used to evaluate the CO2 emission for four types of vehicles including city bus, coach, heavy truck and trailer tractor. China Version World Transient Vehicle Cycle (C-WTVC) and China Heavy-duty Commercial Vehicle Test Cycle (CHTC) were used as simulation cycles. The CO2 emission characteristics and cycle differences of both cycles were compared and analyzed. The results show that CO2 emissions of CHTC are higher than that of C-WTVC for these four types of vehicles with increase percentages ranging from 1.5% to 19%. Cycle average acceleration difference is the most predominant factor. Driving strategy changes due to the cycle difference also lead to the CO2 emission difference because the engine operation points has changed to some extent.