Sensor Fault Detection via Parameter Modulation
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Solution Overview
Problem
Existing fault detection methods for sensor arrangements during operation are limited in detecting deviations in both the sensing elements and the readout chain without additional complex hardware, which can malfunction, and may interfere with the physical quantity being measured, especially in power-critical applications and can only be performed during idle times.
Innovation Solution
Modulating physical parameters of the sensor arrangement using configuration values, comparing the output with a reference output to detect deterministic alterations, allowing for continuous fault detection without additional hardware by utilizing the existing measurement signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If predetermined stimuli are applied to test the sensor arrangement, then fault detection capability is improved, but the testing can only be performed during idle times when the sensor is not in use
Solution Approach 1:
The patent enables continuous fault detection during sensor operation by modulating physical parameters of existing sensing elements rather than requiring separate test stimuli during idle periods. The sensing elements continuously provide both measurement and self-test functions through parameter modulation, eliminating idle time requirements.
Solution Approach 2:
The sensing elements serve dual purposes: they perform both normal measurement functions and self-test functions by modulating their physical parameters. This multi-functionality eliminates the need for separate dedicated test hardware and allows testing during operational periods.
2Reliability
If additional hardware is added for fault detection, then testing coverage is improved, but device complexity and power consumption increase
Solution Approach 1:
The sensing elements perform self-testing by modulating their own physical parameters and evaluating their responses. This self-service capability eliminates the need for additional external test hardware, reducing device complexity and power consumption while maintaining comprehensive testing coverage.
Solution Approach 2:
Existing sensing elements are utilized for both measurement and fault detection functions. By making the sensing elements multi-functional, the patent avoids adding separate test hardware, thereby reducing overall device complexity and power requirements.
3Reliability
If additional hardware is added for fault detection, then testing coverage is improved, but power consumption increases
Solution Approach 1:
The sensing elements conduct self-tests by modulating their own physical parameters without requiring additional powered test hardware. This approach maintains comprehensive testing coverage while avoiding the power consumption associated with separate test equipment.
4Reliability
If predetermined stimuli are applied for testing, then fault detection is improved, but interference with the physical quantity being measured occurs
Solution Approach 1:
The patent applies periodic modulation to physical parameters of sensing elements during operation. This periodic action enables fault detection through parameter variation without requiring separate test stimuli that would interfere with continuous measurement of the physical quantity.
Solution Approach 2:
Instead of applying external test stimuli that interfere with measurements, the patent modulates physical parameters (such as bias current, voltage, or frequency) of the sensing elements themselves. This parameter change approach enables fault detection while maintaining continuous, interference-free measurement of the target physical quantity.
Data Source
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AI summary
A method for detecting a fault in a sensor arrangement (100, 210) is described. The method comprising modulating (410) at least one physical parameter of the sensor arrangement (100, 210) by a configuration value (130), wherein the at least one physical parameter of the sensor arrangement (100, 210) is modulated during operation of the sensor arrangement (100, 210), comparing (420) an output (120) of the sensor arrangement (100, 210) with a reference output (150) related to the modulated at least one physical parameter and detecting (430) a fault based on the comparison. Furthermore, also a corresponding processing circuit is described.