Electric vehicle speed limiting method

Abstract

The invention provides an electric vehicle speed limiting method, which belongs to the technical field of electric vehicle manufacturing, and comprises the following steps: (1) an electric control unit ECM is adopted to acquire a motor speed through a phase signal and calculate a vehicle speed Vt according to a wheel diameter; (2) Vt is compared with speed limit V1, and when Vt is smaller than V1,the step (3) is executed; when Vt is greater than V1, the step (4) is executed; (3) the ECM is adopted to enable the motor to be controlled by a rotating handle; (4), the ECM is adopted to enable thephase frequency to be gradually reduced at the V1 starting point, the speed reduction duration is t1 seconds, Vt is compared with V1, if Vt is larger than V1, the step (5) is executed, and if Vt is smaller than V1, the step (3) is executed, and then the step 6 is executed; (5) the speed reduction signal is changed into a zero duty ratio signal, returning to the step (3) is carried out until Vt isless than V1, and then returning to the step (6) is carried out; (6) the step (3) ismaintained if the opening degree of the accelerator rotating handle is smaller than the first opening degree, and the step (7) is executed if the opening degree is not smaller than the first opening degree; and (7) the phase frequency is controlled to be increased progressively, the maximum value is controlled tobe V1 time phase frequency, and returning to the step (3) is carried out after t2 seconds.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle manufacturing, and in particular relates to a speed limiting method for an electric vehicle. Background technique [0002] Electric vehicles are relatively portable means of transportation for people. With the continuous regulation of the management of riding electric vehicles, the speed limit of electric vehicles has become an important technical parameter for whether electric vehicles meet the standards. [0003] However, most of the current speed limit methods are overspeed power cuts. The technology of this speed limit method is too simple, that is, only by identifying the vehicle speed, when the vehicle speed exceeds a predetermined upper limit, cut off the power supply of the electric vehicle motor, including disconnecting the overall power supply or The way of turning off the driving pulse of the MOS tube, the power supply of the motor will be restored when the vehicle speed drops ...

AI Technical Summary

Problems solved by technology

[0003] However, most of the current speed limit methods are overspeed power cuts. The technology of this speed limit method is too simple, that is, only by identifying the vehicle speed, when the vehicle speed exceeds a predetermined upper limit, cut off the power supply of the electric vehicle motor, including disconnecting the overall power supply or The way of turning off the driving pulse of the MOS tube, the power supply of the motor will be restored when the vehicle speed drops below the predetermined upper limit after the power is cut off, this simple logic control method makes the riding experience significantly worse The cyclist feels a sudden decrease in speed, and when the power supply is restored, the cyclist feels a sudden increase in speed due to the sudden increase in power. The phenomenon of leaning forward and sitting back quickly makes people feel tired and bored, which brings great bad feelings and distracts attention to travel, which is not conducive to physical and mental health and safe travel

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