Browse Publications Technical Papers 2019-01-0723

Research on Key Factors for Range and Energy Consumption of Electric Vehicles 2019-01-0723

Investigations have been carried out to examine the potential to optimize the energy consumption and drive range of the Electric Vehicles (EV). Theoretically, the energy consumption is strongly influenced by system efficiency, coasting resistance and energy recovery technology. In this paper, these three aspects have been studied in detail through both simulation tool and experimental test. Research has been conducted on a Changan sedan EV to explore the influence of each factor on the energy consumption and drive range. The most paramount factor is the vehicle coasting resistance, followed by the power-train system efficiency. To reduce the coasting resistance, interests can be drawn to the application of tire with low resistance coefficient, low friction brake clamp and the modification of vehicle styling. The drive-train efficiency includes the motor efficiency, inverter efficiency and the gearbox efficiency. Interestingly, the effect of energy recovery technology is sensitive to the driving conditions. The I-pedal technology which can supply deceleration up to 0.2g has little influence over NEDC but can extend the range over real-world driving by up to 10% as the real-world driving condition is more intense. In summary, with all the feasible approaches applied on the test vehicle, the energy consumption can be reduced by 11.5%. The predominant factor, coasting resistance, contributes 5.5% to the energy consumption reduction and 6.5% to the range increase. Improving the power-train system efficiency yields a 3% reduction in energy consumption and a 3.3% increase in drive range.


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