Electric bicycle, control device and method thereof

Abstract

The invention discloses an electric bicycle, a control device and a method thereof. The control device comprises a cell sensor module, a PWM (Pulse Width Modulation) control module and a motor drive module, wherein the cell sensor module is used for detecting cell power; the motor drive module is used for driving a motor; and the PWM control module comprises a first voltage judging unit, an accelerate starting unit, a current-limitation judging unit, an undervoltage judging unit and a PWM set-value regulating unit. The invention has the advantages that by reducing starting current and judging the voltage value of the cell power, when judging that the cell voltage dropping variation is greater than a threshold value, the increased proportion of current is reduced immediately, and the voltage drops into a normal range and is finally retained on an undervoltage point. The invention ensures that the electric bicycle can continually run in a state with slightly lower current, an endurance mileage is effectively increased, and cell deep discharge is avoided so that the cell life is prolonged at the same time.

Description

technical field [0001] The invention relates to the field of electric bicycles, in particular to an electric bicycle and its control device and method. Background technique [0002] Due to the limitation of battery capacity, electric bicycles have short cruising range as a key factor restricting their development, and battery life is also another important factor. [0003] In order to protect the battery, all current electric bicycle controllers have an undervoltage protection function, that is, after the controller judges that the battery voltage is lower than a certain value (undervoltage point), it will perform undervoltage protection and stop the motor drive output to prevent The purpose of battery overload operation. [0004] Because the battery has the characteristics of large output current and fast voltage drop, when the battery power is insufficient but the voltage is still higher than the undervoltage point, it is very easy to cause the battery voltage to drop bel...

AI Technical Summary

Problems solved by technology

[0004] Because the battery has the characteristics of large output current and fast voltage drop, when the battery power is insufficient but the voltage is still higher than the undervoltage point, it is very easy to cause the battery voltage to drop below the undervoltage point for a short time due to the large starting current of the electric bicycle and automatically start the battery. protection, the battery cannot continue to be used, reducing the cruising range, and at the same time, the output of high current under low power also reduces the battery life

[0005] The Chinese patent number is "ZL200820033385.1", and the patent title is "Under-voltage continuation control device for electric bicycles". mileage, but the setting of the undervoltage point cannot be dynamically set according to the actual value of the battery power, and the second undervoltage point cannot be dynamically adjusted according to the battery power. Long-term use of the second undervoltage point will cause abnormal current flow of the battery under low power output, while reducing battery life

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