Control method for torque output of electric bicycle

Abstract

The invention discloses a control method for torque output of an electric bicycle, and belongs to the technical field of electric mopeds. The method comprises the following steps of Step 1, measuring motor speed n, Step 2, determining a bus current threshold set value ID according to the motor speed n when the motor speed n is greater than 0, Step 3, obtaining sampling current I(f) from a master control circuit, and obtaining a loop current control set value Ip based on a PD (proportion-differential) correction control mode of loop current Ir, and Step 4, obtaining bus current according to a formula that Id is equal to sigma*Ir. According to the control method, the bus current threshold set value ID is adjusted according to the speed, so that the variable bus current replaces the traditional constant current control mode, the torque output in a whole starting process of the electric bicycle from stationary to full speed is increased, the whole process of the electric bicycle from the stationary to the full speed is a gradual acceleration process, the acceleration time of the electric bicycle is shortened, and the smoothness of starting of the electric bicycle is improved.

Description

technical field [0001] The invention belongs to the technical field of electric bicycles, and in particular relates to a torque output control method of electric bicycles. Background technique [0002] With the rapid development of society and the continuous enhancement of human awareness of environmental protection, electric vehicles have played an increasingly important role in human production and life. Through long-term use, it has been found that, such as figure 1 As shown; because the bus current of the traditional electric bicycle adopts the constant current control method during the starting process, the output torque of the electric bicycle drops relatively quickly, resulting in a relatively slow acceleration process. Therefore, in order to achieve greater acceleration, the traditional The solution is: increase the output current, so the traditional electric vehicle will generate a large driving force at the moment of starting, and this powerful driving force will p...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of society and the continuous enhancement of human awareness of environmental protection, electric vehicles have played an increasingly important role in human production and life. Through long-term use, it has been found that, such as figure 1 As shown; because the bus current of the traditional electric bicycle adopts the constant current control method during the starting process, the output torque of the electric bicycle drops relatively quickly, resulting in a relatively slow acceleration process. Therefore, in order to achieve greater acceleration, the traditional The solution is: increase the output current, so the traditional electric vehicle will generate a large driving force at the moment of starting, and this powerful driving force will pose a great threat to the personal safety of the user; at the same time, this traditional simple The way to increase the current will bring a substantial increase in hardware costs

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