Battery Abnormality Detection via Segmented Voltage-Current Logic
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Solution Overview
Problem
Existing failure determination devices for current sensors in power supplies cannot accurately distinguish between open failures in batteries and intermediate fixed failures, leading to incorrect determinations when battery voltage changes exceed reference values due to power consumption or when batteries are not charging/discharging.
Innovation Solution
An abnormality determination device using a current sensor and a voltage sensor that determines open failures based on voltage and current thresholds, and intermediate fixed failures by assessing internal resistance through regression curves, allowing for accurate discrimination between battery and sensor failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing failure determination device uses battery voltage change amount and battery current change amount to determine current sensor failure, then it can detect intermediate fixed failure in the current sensor, but it may erroneously determine failure when open failure occurs in the battery
Solution Approach 1:
The failure determination is segmented into two distinct determination processes: first determining whether open failure has occurred in the battery using voltage sensor and current sensor data, and then determining intermediate fixed failure in the current sensor based on the open failure determination result. This segmentation prevents erroneous determination by establishing a hierarchical decision logic where the first determination acts as a prerequisite check before the second determination.
Solution Approach 2:
The system performs preliminary determination of open failure in the battery before determining intermediate fixed failure in the current sensor. By checking whether open failure has occurred first (using voltage change amount and current change amount thresholds), the system prepares the determination state and avoids erroneous conclusions in the subsequent current sensor failure detection.
2Adaptability or versatility
If the battery voltage changes exceed reference values due to power consumption changes or lack of charging/discharging, then the voltage stabilization effect wears off, but the existing device cannot distinguish this from actual sensor failure
Solution Approach 1:
The determination thresholds and criteria are made dynamic by considering multiple operating conditions. The system adapts its determination logic based on whether the vehicle is in charging state, discharging state, or idle state, and adjusts its sensitivity accordingly. This dynamic approach allows the system to tolerate normal voltage fluctuations while maintaining precision in detecting actual failures.
Solution Approach 2:
The system changes the determination parameters by introducing multiple threshold values (first predetermined value, second predetermined value) and using different combination criteria for voltage and current changes. By varying these parameters based on operating conditions, the system can distinguish between normal voltage changes due to power consumption and actual sensor failures.
3Device complexity
If the system uses only current sensor data for failure determination, then the determination process is simple, but it cannot distinguish between battery open failure and current sensor intermediate fixed failure
Solution Approach 1:
The system merges data from multiple sensors (voltage sensor and current sensor) and combines multiple determination criteria (voltage change amount, current change amount, charging/discharging state) into a unified failure determination process. This merging allows the system to maintain relatively simple device structure while achieving high precision in distinguishing between different failure types through integrated analysis.
Data Source
AI summary
A power supply having a battery (2) that supplies electric power to an electric load (6), a current sensor (4) that detects the current of the battery (2), and a voltage sensor (5) that detects the voltage of the battery (2) includes abnormality determination means for determining that an open failure has occurred in the battery (2) when the voltage detected by the voltage sensor (5) is larger than a first predetermined change amount and the current detected by the current sensor (4) is smaller than a second predetermined change amount, and determining, if an open failure is not found in the battery (2), that an intermediate fixed failure has occurred in the current sensor (4) when the internal resistance of the battery (2) is greater than or equal to a predetermined value.