Electric vehicle low-voltage battery electricity shortage prevention automatic control method

Abstract

The invention provides an electric vehicle low-voltage battery electricity shortage prevention automatic control method. The method comprises the following steps: when an electric vehicle is in a power-off state, allowing an intelligent vehicle machine to regularly detect whether the voltage value of a low-voltage storage battery is lower than a first preset voltage value needing to be charged or not; if yes, waking up a vehicle control unit; after the vehicle control unit receives a charging request message sent by the intelligent vehicle machine, judging whether the vehicle state of the electric vehicle allows charging of the low-voltage storage battery or not ; if yes, controlling a power battery system to be electrified by high voltage, and starting a direct-current power supply converter to charge a low-voltage storage battery; and when monitoring is carried out and the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging and / or preset stopping time, stopping awakening of the vehicle control unit . In this way, the automatic charging function of the low-voltage storage battery can be achieved, and it can be ensured that the low-voltage storage battery cannot be insufficient in power or over-discharged; and the second preset voltage value for stopping charging and the preset stopping time are set, so that the low-voltage storage battery can be effectively prevented from being overcharged.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an automatic control method, system and computer-readable storage medium for preventing power loss of a low-voltage battery of an electric vehicle. Background technique [0002] At present, new energy electric vehicles such as pure electric vehicles, plug-in hybrid electric vehicles, and fuel cell electric vehicles are oriented toward intelligent development. In the process, the low-voltage battery often loses power, and it is necessary to manually connect the low-voltage battery, which adds a lot of manpower and time costs to the operation. [0003] At the same time, when the low-voltage battery loses power, if it is a lead-acid battery, it will cause the battery plate to vulcanize, which will lead to the problem of capacity attenuation and shortened life, which will increase the cost of vehicle operation and maintenance. [0004] At present, the prevention of low-vol...

AI Technical Summary

Problems solved by technology

[0005] However, this technical solution is realized by a mechanical structure, requires manual operation, and cannot be automated; and after the discharge circuit is cut off, all control modules and smart devices of the vehicle are powered off, and the vehicle status cannot be monitored, such as if the vehicle is stolen or collided. In case of an accident, the alarm cannot be issued, and there are certain hidden dangers to asset safety.

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