Traditional regenerative braking control strategies only consider how to ensure motor to work along with the battery/\nmotor joint high-efficiency working line, but do not consider continuously variable transmission efficiency. However, continuously\nvariable transmission efficiency varies between 70% and 95% which cannot be neglected. Based on the analysis\nof relationship among the battery, motor, continuously variable transmission, and synthesis efficiency, the battery/motor/\ncontinuously variable transmission joint high efficiency is calculated and obtained, and the regenerative braking control\nstrategy is proposed. Comparing the previous control strategy with battery/motor joint high efficiency, the motor average\ngenerating efficiency increases by 2.91%, and braking energy recovery rate increases by 4.09% under Extra Urban\nDriving Cycle, while the motor average generating efficiency increases by 3.84%, and braking energy recovery rate\nincreases by 5.74% under Federal Test Procedure-72 through offline simulation. Furthermore, under the hardware-inthe-\nloop test, the average generating efficiency increases by 2.72%, and the braking energy recovery rate increases by\n5.03% under Extra Urban Driving Cycle, while the average generating efficiency increases by 3.13%, and the braking\nenergy recovery rate increases by 3.94% under Federal Test Procedure-72. Both simulation and hardware-in-the-loop\ntest results show that the proposed regenerative braking control strategy can realize battery, motor, and continuously\nvariable transmission to work with joint high efficiency which can enhance braking energy recovery rate.
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