Sensor Verification Circuit for Measurement Fault Detection
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Solution Overview
Problem
Existing sensor systems face challenges in detecting and accounting for errors in measurements and calculations, which can lead to safety issues due to factors like silicon defects, radioactivity, power fluctuations, and environmental changes, and current self-test methods do not effectively address errors in measurements.
Innovation Solution
A system comprising a sensor device with multiple sensor elements and a verification circuit in a control unit that generates redundant data for verification, allowing for recalculation and identification of faults, including error handling commands to mitigate faults, using independent paths and various data transmission methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-test of calculations is performed to detect faults, then hardware faults can be identified, but measurement errors are not accounted for
Solution Approach 1:
The system segments the data processing into multiple independent paths: a first path that processes sensor data through calculation to generate results, and a second verification path that independently verifies the same data. This segmentation allows each path to be tested separately, enabling detection of both hardware faults and measurement errors without interference between them.
Solution Approach 2:
A verification circuit acts as an intermediary component between the sensor device and the controller. This intermediary receives data from both the first processing path and the second verification path, compares their outputs, and generates verification signals. The intermediary enables cross-checking of measurement data without requiring changes to the original sensor or controller, thus detecting measurement errors while preserving the existing calculation architecture.
2Reliability
If multiple sensor elements and verification circuits are added, then fault detection accuracy is improved, but device complexity increases
Solution Approach 1:
The verification circuit is designed with multi-functionality to reduce overall system complexity. It can verify data from multiple sensor elements, perform both calculation verification and measurement verification, and generate different types of verification signals depending on the detected fault type. This universal verification approach eliminates the need for separate verification circuits for each sensor element or error type, thereby improving fault detection accuracy without proportionally increasing device complexity.
Solution Approach 2:
The system implements self-service verification where the sensor device generates its own verification data internally through the verification circuit, and the controller uses this self-generated verification information to detect faults. This self-service mechanism reduces the need for external verification equipment and simplifies the overall system architecture while maintaining high fault detection accuracy through internal cross-checking.
Data Source
AI summary
A sensor device using verification includes a sensor component and a verification component. The sensor component is configured to generate first data and second data. The verification component is configured to analyze the first data and the second data and generate verification data based on the first data and the second data.