Battery Management Backup Control for EV Emergency Power Cut-Off
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Solution Overview
Problem
Existing battery management systems in electric vehicles may fail to properly control power output due to malfunctioning electronic control units, leading to potential accidents or injuries when drivers attempt to brake or change speed.
Innovation Solution
A battery management system that independently receives signals from brake and accelerator pedals, monitors battery output, and generates emergency power cut-off signals to control power supply to the drive device, supplementing the electronic control unit's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electronic control unit is used to control power output, then the power control function is integrated, but the reliability decreases when the ECU malfunctions
Solution Approach 1:
The patent divides the power control function into two independent parts: the electronic control unit for normal operation and the battery management system for emergency backup. This segmentation ensures that if one system fails, the other can take over, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The battery management system monitors parameters such as brake signal duration, accelerator pedal signal duration, and battery output current to determine when to activate emergency power cut-off. By changing the operational parameters from continuous control to threshold-based emergency control, the system achieves reliable backup functionality.
2Reliability
If the battery management system independently monitors brake and accelerator signals, then the reliability improves, but the device complexity increases
Solution Approach 1:
The battery management system is designed to perform multiple functions: it monitors battery status for normal operation and simultaneously monitors brake and accelerator signals for emergency power cut-off determination. This multi-functionality allows the system to improve reliability without adding separate dedicated monitoring systems.
Solution Approach 2:
The battery management system uses its existing monitoring capabilities and processing resources to independently determine emergency conditions and execute power cut-off decisions. By leveraging its own built-in functions rather than requiring external assistance, the system achieves enhanced reliability without proportionally increasing complexity.
3Reliability
If the power cut-off condition requires signal duration verification, then the false activation is reduced, but the response time increases
Solution Approach 1:
The battery management system continuously monitors brake and accelerator pedal signals in advance, tracking their duration and intensity. This preliminary monitoring allows the system to quickly determine when emergency cut-off conditions are met without requiring additional processing time during the actual emergency event.
Solution Approach 2:
The system implements continuous feedback monitoring of signal durations and compares them against predetermined thresholds. This real-time feedback mechanism enables the system to accurately distinguish between normal operation variations and genuine emergency conditions, reducing false activations while maintaining rapid response capability.
Data Source
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AI summary
A method of controlling power of a battery of an electric vehicle includes receiving at least one of a brake signal or an accelerator pedal signal from at least one of a brake or an accelerator pedal, determining whether at least one of the brake signal or the accelerator pedal signal satisfies a power cut-off condition, and generating an emergency output cut-off signal in response to the power cut-off condition being satisfied.