Analysis of fuel economy reduction factors of hybrid electric vehicles in winter using on-road driving data

초록

The reduction in driving range during winter is one of the major disadvantages of battery electric vehicles and hybrid electric vehicles. On-road driving tests showed that the fuel efficiency was 23.1 km/L at an ambient temperature of 20 degrees C, but it dropped to 20 km/L at 0 degrees C under the same driving conditions. Therefore, this study analyzed the effect of road load and battery internal resistance on fuel economy reduction during winter. The road load and battery internal resistance for various temperatures were extracted from on-road driving data using intuitive and simple methods. The results showed that the road load was the major factor that reduced the fuel economy of hybrid electric vehicles in winter, whereas the effect of battery internal resistance on fuel economy reduction was negligible. As the ambient temperature decreased from 20 degrees C to 0 degrees C, the energy loss due to road load increased by 2.1 kWh, while the energy loss due to battery internal resistance only increased by 0.0345 kWh. Although this study focused on hybrid vehicles, the methodology used can also be applied to battery electric vehicles.

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