Power supply management method based on vehicle-mounted wireless terminal

Abstract

The invention discloses a power supply management method based on a vehicle-mounted wireless terminal. The power supply management method comprises the following steps: determining a voltage threshold V; detecting the voltage of a main power supply of the terminal; comparing the voltage of the main power supply with the threshold V; switching to a standby battery to supply electricity when the voltage of the main power supply is lower than V; shutting down power supplies of modules step by step according to the under-voltage time of the main power supply; and switching back to the main power supply to supply electricity when the voltage of the main power supply recovers. According to the power supply management method provided by the invention, when the main power supply of the terminal generates an abnormal phenomenon that instantaneous under-voltage occurs and quickly recovers, a power supply management module can recognize that the instability is transient, and the standby battery is switched to supply electricity at the transient moment, so that the normal operation of the terminal is guaranteed not to be influenced; when the under-voltage time of the main power supply is long, the power consumption modules can be shut down step by step in a certain order, and when the main power supply of the terminal recovers to normal, the power consumption modules are started step by step; when a core power supply of a Linux system is shut down, time for storing data is provided, so that data can be prevented from being lost.

Description

technical field [0001] The invention relates to a power supply management method based on a vehicle-mounted wireless terminal. Background technique [0002] With the strengthening of the national road transport safety policy, all domestic operating passenger and trucks and dangerous goods transport vehicles must be equipped with on-board wireless terminals for real-time monitoring of operating vehicles. [0003] When the vehicle is ignited, the on-board battery is used to activate the spark plug. If the voltage of the on-board battery is not enough to ignite the spark plug, the vehicle will not be able to ignite and start; when the vehicle is turned off, the on-board wireless terminal will continue to digest the power of the on-board battery. Ensuring that the vehicle can be ignited normally has always been one of the technologies studied by the vehicle wireless terminal. [0004] The power supply of the vehicle battery may be unstable or undervoltage due to various special...

AI Technical Summary

Problems solved by technology

[0006] (1) When the main power supply of the terminal is momentarily abnormal (momentary undervoltage and quickly recovered), the situation cannot be handled well

[0007] (2) When the voltage of the vehicle battery is insufficient, it may cause the vehicle to fail to start normally next time

Other solutions do not handle this well

[0008] (3) Some other single-core power management solutions are not applicable to dual-core terminals

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