The invention provides a driving system for an electric power-assisted bicycle based on a double-planetary gear mechanism and double motors, which is characterized in that an electronic variable-speed ECVT system is formed by a double-planetary gear train and a speed regulating motor, and the mechanical structure of the system is free of the traditional variable-speed structures such as a crankset tooth sheet, a derailleur and a flywheel. And the vehicle control unit determines the working modes of the double planetary gear sets and the double motors according to the control strategy. Under the heavy-load climbing and acceleration working conditions, the double motors jointly output power to participate in driving; under the low-load working condition, the motor B does not work, the motor A is controlled to achieve stepless speed change within a certain range, the treading frequency and torque can be kept within a proper interval, and the riding comfort is improved; and under the sliding or braking deceleration working condition, the motor A does not work, the motor B is switched into a regenerative braking mode, braking energy recovery is achieved, and regenerative braking force is provided. When the moped slides, the one-way clutch can block power transmission from the planetary gear support to the pedals, the problem that the pedals hit the feet is solved, and accidental injuries are avoided.
本发明提出了一种基于双行星齿轮机构及双电机的电动助力自行车用驱动系统,其特征为通过双行星轮系、调速电机组成电子变速ECVT系统,此系统的机械结构去除了牙盘齿片、拨链器、飞轮等传统变速结构。整车控制器依据控制策略,确定双行星齿轮组及双电机的工作模式。重载爬坡、加速工况,双电机共同输出功率参与驱动;低负载工况,B电机不工作,控制A电机可实现一定范围内无级变速,且可以保持踩踏频率和力矩在适宜的区间,提升骑乘舒适性;滑行或制动减速工况,A电机不工作,B电机切换为再生制动模式,实现制动能量回收并提供再生制动力。助力车滑行时,单向离合器会阻断行星齿轮支架到脚踏的动力传递,防止出现脚踏“打脚”问题,避免意外伤害。
Driving system for electric power-assisted bicycle based on double planetary gear mechanism and double motors
一种基于双行星齿轮机构及双电机的电动助力自行车用驱动系统
2022-06-24
Patent
Electronic Resource
Chinese
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