Redundant Sensor Fault Detection via Signal Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Field sensors, particularly in critical applications like automotive systems, face challenges with fault detection due to measurement drift, environmental changes, and material defects, leading to inaccurate readings and potential device failure, necessitating improved diagnostic capabilities to identify and correct faults in real-time.
Innovation Solution
A field-sensor device comprising two sensors with different orientations and a control circuit that converts and compares their signals to determine faulty sensors, allowing for continuous operation by identifying and isolating faulty components, thereby providing accurate and redundant measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single field sensor is used, then the device complexity is reduced, but the reliability and fault detection capability deteriorate
Solution Approach 1:
The field sensor is segmented into multiple sensing elements (first field sensor and second field sensor) with different orientations. Each element independently measures field components, enabling both simplified individual structures and enhanced collective reliability through comparative fault detection.
2Reliability
If multiple field sensors with different orientations are used, then the reliability and fault detection capability are improved, but the device complexity increases
Solution Approach 1:
Multiple field sensors serve dual functions: they simultaneously provide accurate field measurements and enable fault detection through comparison. The same sensing elements used for measurement also detect faults when discrepancies arise, eliminating the need for separate diagnostic components.
Solution Approach 2:
The control circuit continuously compares signals from field sensors with different orientations and provides feedback to identify faults. When discrepancies exceed threshold values, the system generates fault indicators, enabling real-time monitoring and diagnostic capabilities.
3Adaptability or versatility
If field sensors operate in harsh environmental conditions, then the adaptability is improved, but the measurement precision deteriorates due to drift and defects
Solution Approach 1:
The system monitors changes in sensor output parameters over time and compares them against expected ranges. When drift or defects cause parameter deviations beyond threshold values, faults are detected, enabling the system to maintain measurement precision awareness in harsh environmental conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables real-time fault detection and correction, ensuring accurate field measurements even when one sensor fails, using smaller and less expensive circuits, and compensating for defects or material faults in sensors, thus enhancing diagnostic capabilities and system reliability.
Implementation Method 1
Magnetic sensors can incorporate Hall-effect sensors that generate an output voltage proportional to an applied magnetic field
Implementation Method 2
magneto-resistive materials whose electrical resistance changes in response to an external magnetic field
Data Source
AI summary
A field-sensor device comprises first and second field sensors disposed in corresponding different first and second orientations, each responsive to an external field to produce corresponding first and second sensor signals. One of or both the first and second sensor signals are converted to equivalent comparable sensor signals in a common orientation and compared to determine a faulty field sensor. If a faulty field sensor is determined, a faulty sensor signal is produced or, if a faulty sensor is not determined, an output sensor signal responsive to the first, second or comparable sensor signals is produced. Evaluation of the direction of differences between the comparable sensor signals can determine which of the first and second field sensors is faulty.