Abstract
Considering the problems of the low energy recovery efficiency and the short driving range of pure electric vehicles, a new electromechanical–hydraulic coupled power electric vehicle is proposed. First, we develop an electromechanical–hydraulic coupled power electric vehicle model and design an energy management strategy to match it. On this basis, an optimization strategy is proposed with the goal of improving the braking energy recovery efficiency and avoiding the impact of high-speed braking energy recovery on the hydraulic system. The energy recovery mode conversion is optimized for different vehicle speeds when braking. Finally, the proposed optimization strategy is verified by joint simulation. The results show that when the vehicle speed is higher than 10 m/s for energy recovery mode switching, the total recovery efficiency of the whole vehicle increases to 97.273% and the SOC of the power battery increases by 0.14%. This provides strong support for improving the driving range of electromechanical–hydraulic coupled power electric vehicles.
Highlights
With the significant increase in the use of vehicles, the application of renewable resources has become one of the most critical developments in the modern automotive industry [1]
Governments strongly support the development of vehicles based on new forms of energy, which are currently divided into electric vehicles (EVs), hybrid electric vehicles (PHEVs), and fuel cell electric vehicles (FCEVs) [4,5]
PHEVs usually use a small internal combustion engine powered by fossil fuels with an electric motor, which can increase the range of the vehicle but not eliminate the use of fossil fuels [9]
Summary
With the significant increase in the use of vehicles, the application of renewable resources has become one of the most critical developments in the modern automotive industry [1]. Governments strongly support the development of vehicles based on new forms of energy, which are currently divided into electric vehicles (EVs), hybrid electric vehicles (PHEVs), and fuel cell electric vehicles (FCEVs) [4,5]. Vehicles based on new forms of energy will undoubtedly become the key to the future development of and competition in the world’s automotive industry [6]. FCEVs are considered to be one of the cleanest vehicles that do not use fossil fuels, but they are limited by the hydrogen infrastructure and the procurement cost of fuel cells, which will have a low penetration rate in the coming years [11]
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