Dual-Sensor Current Monitoring for Fault Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrical current monitoring systems in electric and hybrid powertrains face challenges in accurately monitoring current flow across a wide range, from under 1.0 ampere to 300 amperes, leading to potential faults such as open or short circuits, which can result in system malfunctions and customer dissatisfaction, and necessitate robust diagnostic capabilities to comply with regulatory requirements.
Innovation Solution
A dual-sensor system comprising a first sensor for monitoring low current ranges (+/â30 amperes) and a second sensor for high current ranges (+/â300 amperes, with validation and comparison of outputs at zero current, magnitude, and polarity to detect faults and ensure accurate state-of-charge estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used to monitor the full current range, then device complexity is reduced, but measurement precision deteriorates across different current ranges
Solution Approach 1:
The current monitoring range is segmented into multiple ranges, with each sensor optimized for a specific range. The first sensor monitors low current ranges (+/- 30 amperes) with high precision, while the second sensor monitors high current ranges (+/- 300 amperes). This segmentation allows each sensor to operate within its optimal precision range, resolving the contradiction between device simplicity and measurement accuracy across the full current spectrum.
2Measurement precision
If dual sensors are used to improve measurement precision across different current ranges, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines two sensors with different monitoring ranges into a unified current monitoring system. The control system merges the outputs of both sensors through validation checks and comparison logic, selecting the appropriate sensor reading based on the current magnitude. This merging approach maintains high measurement precision across the full current range while managing system complexity through integrated control logic.
Solution Approach 2:
The dual-sensor system is designed with universal applicability across the entire current range from low to high amperes. Both sensors are integrated into a single monitoring framework that can handle any current level, making the system universally functional rather than requiring separate monitoring systems for different current ranges.
3Ease of operation
If sensor outputs are monitored without validation and comparison, then ease of operation is improved, but reliability deteriorates due to undetected faults
Solution Approach 1:
The control system implements feedback mechanisms that continuously validate and compare outputs from both sensors. The system checks for consistency between sensor readings, validates that outputs are within expected ranges, and compares magnitudes and polarities. This feedback loop automatically detects faults such as open or short circuits without requiring manual intervention, thereby maintaining ease of operation while significantly improving reliability.
Solution Approach 2:
The system performs preliminary validation and comparison of sensor outputs before using the data for state-of-charge determination. By pre-checking sensor validity, comparing readings at zero current, and verifying polarity consistency in advance, the system prevents faulty data from affecting reliability while maintaining simple operation through automated checks.
Data Source
AI summary
A method and article of manufacture are provided to monitor a sensing system operative to monitor electrical current in a transmission line between an electrical storage device and an electrical machine. The sensing system comprises first and second sensors, operative to monitor first and second ranges of electrical current. The method comprises determining outputs of the first and second sensors are valid, and comparing outputs of the first and second sensors when current is substantially zero. The method comprises comparing magnitudes of the outputs of the first and second sensors when the monitored electrical current, and monitoring polarity of each of the outputs of the first and second sensors.