A control method and device for extending the cruising range of an electric vehicle

Abstract

The invention relates to the control field of an electric bicycle, and discloses a control method and device for prolonging the driving mileage of the electric bicycle. The method comprises the following steps that (1) a controller judges whether a slow-down mode is started or not; (2) if the slow-down mode is started, the speed at present is collected to be compared with a preset speed; (3) the current at present is collected to be compared with a preset current; (4) the duty ratio of PWM is adjusted. The control method for prolonging the driving mileage of the electric bicycle is used, when a rider feels that the dump energy can not be used for getting the destination, the controller is manually switched to be in the slow-down mode. Under the slow-down mode, the controller reduces the duty ratio of the PWM, so that the output current is reduced, the rotating speed of the motor is reduced, the speed of the electric bicycle is reduced, and the energy consumption per kilometer of the entire electric bicycle is limited within a reasonable range. Through experiment measurement, under the same condition, the driving mileage obtained by the scheme of the control method and device is improved by about 61% than the driving mileage of a conventional scheme, the energy consumption per kilometer is reduced by about 40%, and the driving mileage under the same electric quality is effectively improved.

Description

technical field [0001] The invention relates to the field of electric vehicle control, in particular to a control method and device for extending the cruising range of an electric vehicle. Background technique [0002] Existing electric vehicles, such as electric bicycles, all have a set of controllers that control the working state of the electric motor, and the controller controls the work of the electric motor according to the manual operation instructions of the rider. The power of the motor comes from the battery, but the battery voltage decay of the battery is nonlinear. When the battery is fully charged, the voltage decreases slowly. When the voltage is insufficient, the decay is a faster and faster process. [0003] At present, for the undervoltage protection of electric bicycles, most car manufacturers adopt the controller undervoltage protection method. When the battery voltage is detected to be close to the undervoltage point, the controller adjusts the output PWM...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of increasing the cruising range of an electric vehicle without increasing the hardware cost, and to provide a control method and device for extending the cruising range of an electric vehicle, which effectively improves the mileage that can be driven under the same amount of electricity

Images