Current Sensor State Detection in Multi-Storage Power Supply
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing technologies face challenges in efficiently determining the states of current sensors in a power storage device with multiple electric storage sections, leading to potential control accuracy decline and accelerated degradation due to malfunction detection limitations.
Innovation Solution
A system that includes multiple current sensors and a battery ECU for comparing current values between storage batteries and a PDU side current sensor, using specific patterns and voltage conversion ratios to determine the state of each current sensor, allowing for efficient detection even during vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current sensor malfunction detection methods are used, then detection capability is limited, but system complexity and detection time increase
Solution Approach 1:
The system uses the existing current sensors themselves to detect malfunctions by comparing their readings against each other and against expected values calculated from power balance equations. The sensors serve both their primary measurement function and the secondary function of self-diagnosis, eliminating the need for separate detection circuits.
Solution Approach 2:
The battery ECU performs multiple functions: it manages power supply control, monitors battery states, and detects current sensor malfunctions all using the same hardware resources and data processing capabilities. The system integrates sensor monitoring into the existing power management architecture rather than adding separate specialized equipment.
2Reliability
If frequent current sensor state detection is performed, then reliability improves, but processing time and computational load increase
Solution Approach 1:
The battery ECU continuously monitors current sensor states during normal power supply operations without interrupting or pausing the detection process. The monitoring occurs continuously as part of the regular power management control loop, allowing real-time detection without dedicated detection phases that would waste time.
Solution Approach 2:
The system detects sensor malfunctions by monitoring changes in current value relationships and power balance parameters. By tracking parameter variations over time and comparing them against expected ranges, the system can identify malfunctions efficiently without requiring extensive processing time for each individual measurement.
3Measurement precision
If special detection patterns or circuits are added, then detection precision improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The system uses the existing current sensors themselves to detect malfunctions by comparing their readings against each other and against expected values calculated from power balance equations. The sensors serve both their primary measurement function and the secondary function of self-diagnosis, eliminating the need for separate detection circuits.
Solution Approach 2:
The battery ECU acts as an intermediary that processes data from existing current sensors and power management components to detect sensor malfunctions. Rather than adding new detection hardware, the ECU uses software-based analysis of existing electrical parameters and sensor readings to identify malfunctioning sensors.
Data Source
AI summary
A power supply includes a first and second electric storage sections, a first sensor detecting a first current of charge/discharge of the first storage section, a second sensor detecting a second current of the charge/discharge of the second storage section, and a circuit module having a control section to determine a state of the first sensor, the second sensor, and/or a third sensor detecting a third current of a driving section by comparing a first current with a third current in a charge/discharge between the first storage section and the driving section, and/or a second current with the third current in a charge/discharge between the second storage section and the driving section, and by comparing the first current with the second current and the first current with the third current in the discharge of the first storage section to the second storage section and the driving section.