Vehicle Battery Cutoff Control for Low-Start-Power Protection
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Solution Overview
Problem
Lead-acid batteries in vehicles self-discharge and continue to supply power to external devices after being turned off, leading to a loss of power and inability to start the engine, with existing solutions focusing on miniaturized emergency power supplies that may not be readily available, posing safety risks.
Innovation Solution
A method and device that calculates a target battery level using historical maximum starting current and a pre-stored battery characteristic table to cut off power to external devices when the battery level falls below this threshold, reducing self-consumption and preserving battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the battery continues to supply power to external devices after the vehicle is turned off, then the external devices can remain functional, but the battery voltage drops below the ignition voltage causing the engine to fail to start
Solution Approach 1:
The control unit calculates the target battery level in advance based on the historical maximum starting current and battery characteristic table before the battery voltage drops below the ignition voltage. This preliminary determination of the threshold level allows the system to proactively cut off power to external devices before starting failure occurs, rather than reacting after the problem has manifested.
Solution Approach 2:
The control unit continuously detects the real-time battery level and compares it with the calculated target battery level. When the real-time level falls below the target, the system automatically cuts off power coupling between the battery and external devices. This closed-loop feedback mechanism ensures the battery voltage is maintained above the critical ignition voltage threshold.
2Reliability
If emergency starting power supply is provided, then the engine can be started when battery voltage is low, but the user may not have the emergency power supply readily available causing safety risks
Solution Approach 1:
The vehicle's own battery system provides protection by automatically detecting low battery conditions and cutting off power to external devices. This self-service mechanism eliminates the need for external emergency starting equipment, as the system prevents the low-voltage condition from developing in the first place through automated monitoring and control.
3Adaptability or versatility
If the battery characteristic table is made modifiable, then the system can adapt to different battery types, but the system complexity and potential for errors increase
Solution Approach 1:
Instead of allowing direct modification of the battery characteristic table, the system uses a pre-stored copy of typical battery characteristics. The control unit calculates the target battery level based on this reference table and the specific vehicle's historical maximum starting current, avoiding the need for users to directly edit or configure complex battery parameters while still achieving adaptation to different battery types.
Data Source
AI summary
A low battery protection method, device, and medium are provided, the method includes: obtaining a historical maximum starting current of an engine, detecting a real-time battery level of the battery, obtaining a pre-stored battery characteristic table, the battery characteristic table includes a mapping relationship between a battery capacity and a maximum instantaneous discharge current of the battery; selecting a maximum instantaneous discharge current that is higher than the historical maximum starting current, forming a set of battery levels corresponding to the maximum instantaneous discharge currents, taking the battery level with a smallest value from the set as a target battery level; when the real-time battery level is lower than the target battery level, cutting off a power coupling between the battery and an external device of a vehicle, which can effectively reduce a self-consumption of the battery.