Battery Management Power Cut-Off for ECU Failure in EVs
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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, power buttons, and electronic control units to determine power cut-off conditions, generating emergency signals to control power supply directly 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 functionality is integrated, but the system reliability deteriorates when the ECU malfunctions
Solution Approach 1:
The patent segments the power control function from the electronic control unit and creates an independent battery management system. The BMS directly receives signals from the power button, brake pedal, and accelerator pedal, and independently controls power output to the drive device. This segmentation ensures that ECU malfunction does not affect power control reliability.
Solution Approach 2:
The battery management system acts as an intermediary between the input signals (power button, brake pedal, accelerator pedal) and the power output control. It receives signals directly from these components and independently determines power cut-off conditions, serving as a mediator that ensures reliable power control regardless of ECU status.
2Reliability
If the battery management system independently controls power, 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 state, receives signals from power button/brake/accelerator pedals, determines power cut-off conditions, and controls power output. By consolidating these functions in a single multi-functional BMS, the patent avoids adding separate complex subsystems while achieving independent power control.
3Measurement precision
If the power cut-off condition is determined by multiple signals, then the accuracy of emergency detection improves, but the measurement complexity increases
Solution Approach 1:
The patent establishes predetermined power cut-off conditions that are determined in advance through signal value comparisons and duration checks. The BMS compares signal values against reference values and checks if signals persist for predetermined time periods, allowing rapid emergency detection without complex real-time analysis.
Data Source
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.