Low electric quantity detection and protection system and method for vehicle storage battery

Abstract

The embodiment of the invention provides a low electric quantity detection and protection system and method for a vehicle storage battery. The system comprises the vehicle storage battery, a power supply cord and vehicle-mounted electronic equipment, the vehicle-mounted electronic equipment comprises a voltage comparator, an analog-to-digital converter and a processor, a first voltage input end ofthe voltage comparator is connected with a voltage output end of the vehicle storage battery through the power supply cord, a second voltage input end of the voltage comparator is connected with a low voltage hint threshold voltage, and an output end of the voltage comparator is connected with the processor; an input end of the analog-to-digital converter is connected with a voltage output end ofthe vehicle storage battery, and an output end and switch control end of the analog-to-digital converter are connected with the processor. According to the embodiment of the invention, the electric quantity of the vehicle storage battery is detected and fed back by combining the voltage comparator and the analog-to-digital converter, the electric quantity of the vehicle storage battery can be monitored accurately and quickly, a response can be quickly made according to the low electric quantity condition of the vehicle storage battery, and the situation is avoided that some faults are causedby excessive consumption of the storage battery.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of vehicle equipment, and in particular to a low battery detection and protection system and method for a vehicle battery. Background technique [0002] The battery is the main power supply component of the car, and its power directly affects whether the vehicle can run normally. [0003] In the prior art, the detection of the electric quantity of the automobile storage battery often directly detects the terminal voltage of the vehicle-mounted electronic equipment connected to the vehicle storage battery, and the voltage of the vehicle-mounted electronic equipment terminal is tested by an analog-to-digital converter ADC (Analog-to-Digital Converter, analog-to-digital converter). Sampling, by reading the voltage obtained by ADC sampling, and then estimating and judging the power condition of the battery. [0004] In the process of realizing the present invention, the inventor found that...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has the following defects: due to the difference in power consumption of automobile electrical equipment, for example: the power consumption of the same electrical equipment in different application scenarios is different, and the power consumption of the same vehicle is different. The number of multiple electrical devices installed is different, resulting in inconsistent line loss on the power line connecting the car battery and the on-board electronic device

At the same time, there will be different phenomena in the instantaneous fluctuation of voltage

Therefore, directly detecting the terminal voltage of the vehicle electronic equipment through ADC sampling to estimate the power of the car battery will lead to a large difference between the estimated voltage value and the actual voltage value, resulting in the car not being able to respond in time and accurately to the low power of the car battery to protect the car battery

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