Sensor Fault Detection via Discharge Time Constant Comparison
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Solution Overview
Problem
Existing methods for detecting faults in sensors, particularly piezoelectric sensors used in vehicles, are inadequate as they only record measurement errors indirectly, lacking precision and reliability in diagnosing sensor malfunctions.
Innovation Solution
A method that filters measurement signals using a time-dependent discharge function with logarithmization to determine parameter values, comparing first and second discharge time constants to accurately detect sensor faults, thereby enhancing diagnostic accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect detection methods using calibration procedures and pseudosensor values are used, then sensor faults can be detected, but the detection precision and reliability are insufficient
Solution Approach 1:
The patent replaces indirect mathematical transformation methods (calibration procedures and pseudosensor value calculations) with direct physical measurement of the sensor's discharge time constant. This substitution of measurement approach enables direct observation of the sensor's actual physical state rather than inferring faults through complex data transformations, thereby improving both detection precision and reliability simultaneously.
2Measurement precision
If sensor characteristics are directly measured using discharge time constant, then detection precision improves, but measurement and evaluation complexity increases
Solution Approach 1:
The patent extracts the discharge time constant as a separate, isolated characteristic parameter from the sensor's output signals. By focusing measurement efforts on this single extracted parameter rather than analyzing complex raw sensor data, the method achieves high detection precision while keeping the measurement and evaluation process relatively simple. The extraction of this specific physical characteristic simplifies the overall diagnostic approach.
3Reliability
If continuous monitoring of discharge time constant is performed, then sensor availability and safety improve, but energy consumption and processing load increase
Solution Approach 1:
The patent implements periodic measurement of the discharge time constant at predetermined intervals rather than continuous monitoring. This periodic approach maintains sensor operation safety by detecting faults when they occur, while significantly reducing energy consumption and processing load compared to continuous monitoring. The system balances safety requirements with resource efficiency by measuring only when necessary.
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
This approach ensures precise detection of sensor faults, reducing their influence on measurements and enabling timely maintenance by generating warning events, thus ensuring high reliability and availability of vehicle components.
Implementation Method 1
a sensor (1), in particular a piezoelectric sensor (1), for vehicles... wherein measurements (2) are carried out using the sensor (1)... wherein the sensor (1) monitors a vehicle component
Implementation Method 2
filtered signals (9) are formed by filtering the measurement signals (3), wherein the parameter values of the time-dependent discharge function comprising a time matrix with a first time, a second time up to an N-time are determined by taking the logarithm of the filtered signals (9)
Implementation Method 3
discharge time data with a first discharge time constant (τ1) of the sensor are read from a data storage (TEDS) of the sensor... a second discharge time constant (τ2) is determined from the discharge function... by comparing the first discharge time constant (τ1) with the second discharge time constant (τ2)
Data Source
Figure 1~2
Figure 3~4
AI summary
A method for detecting disturbances in a sensor (1), wherein measurements (2) are performed, discharge time data with a first discharge time constant τ1 are read from a data memory of the sensor (1), and corresponding measurement signals (3) as well as the discharge time data are transmitted to a processing unit (4), wherein signal processing (5), signal evaluation (6), and data evaluation (7) are performed in the processing unit (4), and wherein filtered signals (9) are generated by filtering (8) the measurement signals (3). It is proposed that parameter values of a discharge function b- are determined by taking the logarithm (10) of the filtered signals (9), that a second discharge time constant τ2 is determined from the discharge function b-, and that disturbances, errors, or damage to the sensor (1) are detected by comparing (11) the first discharge time constant τ1 with the second discharge time constant τ2. This allows the influence of sensor disturbances on the measurements (2) to be reduced.