Current Sensor Diagnosis Using Section-Based Error Thresholds
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Solution Overview
Problem
Existing current sensor diagnosis methods using fixed reference values inaccurately diagnose errors due to variations in current size, leading to misdiagnosis in both small and large current measurements.
Innovation Solution
A current sensor diagnosis system that uses section reference values determined by multiplying a current value by a predetermined error ratio, allowing accurate error diagnosis by comparing the difference between two current sensors' measurements within specific current sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed reference value is used for current sensor diagnosis, then the diagnosis method is simple to implement, but the diagnosis accuracy deteriorates when current size varies
Solution Approach 1:
The reference value is changed from a fixed constant to a dynamic value that varies with the measured current magnitude. The diagnosis device selects different reference values based on the current section (small, medium, large current ranges), allowing the reference value to adapt to the actual measurement conditions and maintain high diagnosis accuracy across different current levels.
Solution Approach 2:
The reference value parameter is changed according to the current magnitude. Instead of using a single fixed reference value, the system employs multiple reference values corresponding to different current sections. The appropriate reference value is selected based on the measured current size, thereby resolving the contradiction between implementation simplicity and diagnosis accuracy.
2Device complexity
If a fixed reference value is used, then the system complexity is low, but misdiagnosis occurs in both small and large current measurements
Solution Approach 1:
The current measurement range is segmented into multiple sections (small current, medium current, large current). Each section has its own dedicated reference value. This segmentation allows the system to handle different current magnitudes appropriately, preventing misdiagnosis while keeping each segment's processing relatively simple.
Solution Approach 2:
Different reference values are assigned to different current sections, creating local optimization. Each current section uses a reference value specifically suited to its characteristics, ensuring high diagnosis reliability locally. The overall system maintains moderate complexity through this localized approach rather than requiring a completely complex adaptive algorithm.
Data Source
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AI summary
The present invention relates to a current sensor diagnosis method, and a current sensor diagnosis system and a battery system providing the method, and the current sensor diagnosis system of the present invention includes: a first current sensor; a second current sensor connected in series with the first current sensor; a communication unit configured to receive a first current value measured by the first current sensor and a second current value measured by the second current sensor; and a control unit configured to select a current section to which the first current value and the second current value belong among a plurality of current sections distinguished by a size of a current, calculate a difference value between the first current value and the second current value, compare the difference value with a section reference value corresponding to the selected current section, and diagnose a state of the first current sensor and the second current sensor.