BMS Voltage Threshold Counting for Fast Mode Diagnosis
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Solution Overview
Problem
Current battery management system (BMS) diagnostic methods require excessive time and effort to check the measuring cycle, making it inefficient to determine if the BMS is operating normally.
Innovation Solution
A measuring device and diagnostic system that measures voltage from a node connected to the BMS, counts the number of times the voltage reaches a reference value during a measuring period, and determines the BMS state as normal or abnormal based on predefined ranges for different measurement modes, with an output device providing visual diagnostic results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional equipment such as oscilloscope is used to check the measuring cycle of BMS, then the measuring cycle can be observed, but the diagnostic process requires excessive time and manual effort
Solution Approach 1:
The BMS performs self-diagnosis by automatically monitoring its own voltage signals and determining its operating mode without requiring external oscilloscope equipment or manual intervention. The controller counts voltage threshold crossings and compares them against expected ranges for different modes, enabling the system to self-verify its proper operation.
Solution Approach 2:
The patent replaces the mechanical/manual oscilloscope-based diagnostic method with an automated electronic measurement system. The voltage measurer and controller automatically capture, process, and analyze voltage signals, substituting the manual mechanical adjustment and visual observation process with automated electronic detection and digital comparison.
2Loss of information
If manual operation of oscilloscope and screen manipulation is required to check BMS measuring cycle, then the measuring cycle information can be obtained, but the operation complexity and time consumption increase significantly
Solution Approach 1:
The diagnostic system performs automatic self-diagnosis by having the controller internally count voltage threshold crossings and compare the count against predefined ranges for different BMS modes. This eliminates the need for operators to manually manipulate oscilloscope controls or interpret complex waveforms, as the system automatically determines and reports the BMS operating state.
Solution Approach 2:
The patent extracts only the essential diagnostic information (voltage threshold crossing count) from the complex voltage waveform, comparing it against predetermined ranges to directly determine the BMS mode. This extraction approach eliminates the need for operators to perform complex screen manipulations or analyze detailed waveform characteristics, simplifying the diagnostic process to a single automated comparison.
3Productivity
If automated voltage measurement and counting method is used to determine BMS mode, then the diagnostic speed and accuracy are improved, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions using a single integrated unit: it receives voltage signals from the voltage measurer, counts the number of times the voltage reaches the reference threshold, compares the count against predetermined ranges, and determines the BMS operating mode. This multi-functionality approach avoids the need for separate dedicated components for each diagnostic function, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent combines the voltage measurement, signal processing, threshold counting, and mode determination functions into an integrated controller system. By merging these functions that could potentially be separate components into a single controller, the overall device complexity is minimized while still achieving automated high-speed diagnostic capability.
Data Source
AI summary
A measuring device includes: a voltage measurer configured to measure a voltage from a node on a wire connected to a battery management system (BMS); and a controller configured to receive the measured voltage signal from the voltage measurer to derive a voltage value, to count the number of times the voltage value reaches a reference voltage during a measuring period, and to determine a state of the BMS as one of a normal state of a first mode, a normal state of a second mode, or an abnormal state based on the number of times.