Automatic charging method and system for electric automobile on-board storage battery

Abstract

The invention discloses an automatic charging method and system for an electric automobile on-board storage battery. The automatic charging method comprises the steps that 1, after an automobile is powered off, the still standing time exceeds the still standing time threshold value, and low-voltage power supply is conducted on a DC-DC converter; 2, whether the voltage of low-voltage power supply is smaller than the low voltage limiting value of the storage battery or not is judged; if not, the voltage of the DC-DC converter is low, and an automobile controller is powered off; and if yes, the automobile controller controls a high-voltage relay to be closed, the DC-DC converter is subjected to high-voltage power supply, and the storage battery is charged; 3, whether the voltage of high-voltage power supply is smaller than the undervoltage limiting value of a power battery or not is judged, and if yes, the DC-DC converter stops working, the automobile controller controls the high-voltage relay to be switched off, and the automobile controller is powered off; and 4, whether the charging current value is smaller than the full current threshold value or not is judged, and if yes, the automobile controller controls the high-voltage relay to be switched off, the voltage of the DC-DC converter is low, and the automobile controller is powered off. According to the automatic charging method and system for the electric automobile on-board storage battery, the problem that an error exists between the estimated still standing time and the estimated charging time is solved.

Description

technical field [0001] The invention relates to the technical field of electronic control, in particular to an automatic charging method and system for an on-board storage battery of an electric vehicle. Background technique [0002] Electric vehicles have a lot of constant power supply equipment, such as BMS management system, body controller, etc. When the electric vehicle is left unused for a long time, although the low-voltage power supply of the main components is disconnected, the vehicle battery still needs to provide constant power supply. Electric equipment is used to supply power, and the battery may be depleted due to excessive energy consumption, resulting in the failure of the electric vehicle to start normally. [0003] In order to prevent the battery from running out of power, current electric vehicles have automatic charging functions, such as figure 1 As shown, it is a structural schematic diagram of the automatic charging system for the on-board battery of...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an automatic charging method and system for an on-board battery of an electric vehicle, which solves the problem in the prior art that there is an error in estimating the resting time of the battery and the estimated charging time through the remaining power of the battery, which causes the battery to lose power or cannot be fully charged.

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