Current Sensor Diagnosis via Voltage Deviation Analysis
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Solution Overview
Problem
Current methods for diagnosing current sensors on charging/discharging paths connected to battery modules are inefficient as they cannot continuously measure voltage, current, and temperature, leading to inaccurate overcurrent determinations and potential misdiagnosis of open circuit states.
Innovation Solution
An apparatus and method that includes a measuring unit to monitor voltages and currents at both ends of secondary batteries and the battery module, and a control unit with deviation checking parts to diagnose open circuit states by comparing voltage deviations over time, allowing continuous measurement and accurate diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current sensor diagnosis mode is performed, then current sensor open circuit state can be diagnosed, but voltage, current and temperature measurement and transmission are interrupted for predetermined time
Solution Approach 1:
The patent implements continuous measurement and transmission of voltage, current, and temperature data during current sensor diagnosis by using a separate measurement path that operates independently of the diagnosis mode. The measurement unit continuously monitors battery parameters and transmits them to the control unit regardless of whether diagnosis mode is active, ensuring uninterrupted data flow while maintaining diagnosis functionality.
Solution Approach 2:
The patent introduces a separate measurement unit as an intermediary component that independently measures voltage, current, and temperature without being affected by the current sensor diagnosis mode. This measurement unit acts as a mediator between the battery and the control unit, providing continuous data transmission while the diagnosis function operates separately, thus resolving the conflict between diagnosis and continuous monitoring.
2Measurement precision
If conventional current sensor diagnosis method is used, then open circuit state can be detected, but continuous measurement of voltage, current and temperature cannot be maintained
Solution Approach 1:
The patent divides the monitoring system into two independent functional segments: a diagnosis unit for detecting current sensor open circuit states and a measurement unit for continuous voltage, current, and temperature monitoring. This segmentation allows both functions to operate simultaneously without interfering with each other, maintaining measurement precision for diagnosis while preserving continuous monitoring productivity.
Solution Approach 2:
The measurement unit is designed with multi-functionality to serve dual purposes: it continuously monitors battery parameters (voltage, current, temperature) and simultaneously provides data for current sensor diagnosis. This universal measurement capability eliminates the need to choose between diagnosis accuracy and continuous monitoring, as both functions share the same measurement infrastructure.
3Ease of operation
If current sensor diagnosis is performed, then diagnosing function can operate, but voltage, current and temperature data transmission to MCU or ECU is stopped
Solution Approach 1:
The patent ensures continuous transmission of battery parameter information (voltage, current, temperature) to the MCU or ECU during diagnosis operation by implementing a separate data transmission path. The measurement unit continuously sends data to the control unit, which then transmits it to superior control devices without interruption, even when diagnosis functions are actively operating.
Solution Approach 2:
The patent implements a feedback mechanism where the control unit receives continuous measurement data from the measurement unit and uses this information to maintain system operation during diagnosis. The control unit processes the continuous data stream and provides feedback to the MCU or ECU, ensuring that no information is lost during the diagnosis process and that system control is maintained.
Data Source
AI summary
Apparatus and method for diagnosing a current sensor serially connected to a battery module having at least one secondary battery, including a measuring unit connected to both ends of at least one secondary battery and both ends of the battery module to measure voltages, and connected to both ends of the current sensor to measure current flowing through, and a control unit including a first deviation checking part checking a first voltage deviation between the voltage at both ends of each secondary battery at first and second times by setting a time difference, a second deviation checking part summing the voltages at both ends of each secondary battery and checking a second voltage deviation between the summed voltage and the voltage at both ends of the battery module, and a diagnosing part diagnosing whether the current sensor is in an open circuit state using the first and second voltage deviations.