Physical Quantity Measurement Device Failure Diagnosis
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Solution Overview
Problem
Existing physical quantity measurement devices face challenges in accurate failure diagnosis due to susceptibility to individual fluctuations of sensor elements, increased chip size, and cost issues related to vibration leakage component extraction, as well as difficulties in determining disconnections in detection electrodes.
Innovation Solution
A physical quantity measurement device with a sensor element having drive and detection electrodes forming coupling capacitances, and a circuit device with switches that change connection states to determine failure paths in detection signals, allowing for simple and accurate failure diagnosis using a failure diagnosis circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration leakage component extraction is used for failure diagnosis, then determination accuracy of failure diagnosis is improved, but chip size increases and cost increases
Solution Approach 1:
The patent extracts only the necessary signal components (drive signal and detection signal) through selective switching, eliminating the need for complex vibration leakage extraction circuits. The switch isolates and routes specific signals to the diagnosis circuit, achieving accurate failure diagnosis with minimal circuitry.
Solution Approach 2:
The switch serves multiple functions: it acts as a signal router during normal operation and as a diagnostic tool during failure diagnosis. By controlling the connection state of the switch, the system can perform both normal detection and failure diagnosis using the same circuit components, eliminating the need for separate extraction circuits.
2Measurement precision
If vibration leakage component extraction is used for failure diagnosis, then determination accuracy of failure diagnosis is improved, but cost increases
Solution Approach 1:
The switch and existing detection circuit serve dual purposes: normal detection operation and failure diagnosis. This eliminates the need for separate extraction circuits and additional components, reducing manufacturing cost while maintaining high determination accuracy through intelligent signal routing.
Solution Approach 2:
The system uses its own existing components (switch, drive circuit, detection circuit) to perform failure diagnosis without requiring external or additional specialized extraction circuits. The switch's connection state control enables the system to self-diagnose failures using already-present hardware.
3Reliability
If additional extraction circuit is added for failure diagnosis, then failure diagnosis capability is improved, but device complexity increases
Solution Approach 1:
The switch and detection circuit perform both normal operation and failure diagnosis functions. By controlling the switch connection state, the system routes signals appropriately for either mode, eliminating the need for separate extraction circuits and maintaining simple device architecture while achieving reliable failure diagnosis.
Solution Approach 2:
The patent merges the failure diagnosis function with the existing detection circuit by using the switch to route signals. This consolidation eliminates separate extraction circuits and integrates diagnosis capability into the existing structure, reducing overall device complexity while improving reliability.
4Device complexity
If simple failure diagnosis method is used, then device complexity is reduced, but determination accuracy of failure diagnosis deteriorates
Solution Approach 1:
The system changes the connection state parameter of the switch to enable failure diagnosis. By controlling whether the switch is connected or disconnected, the system can selectively route signals for diagnosis purposes, achieving high determination accuracy with simple circuitry through parameter control rather than complex circuit design.
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 precise failure diagnosis with reduced noise and increased determination accuracy, minimizing chip size and cost while eliminating the need for additional extraction circuits.
Implementation Method 1
coupling capacitances are formed between the drive electrode and the first detection electrode and between the drive electrode and the second detection electrode
Data Source
AI summary
A physical quantity measurement device includes a sensor element in which coupling capacitances are formed between a drive electrode and a first detection electrode and between the drive electrode and a second detection electrode; and a circuit device that includes a drive circuit which supplies a drive signal to the drive electrode, a detection circuit which detects physical quantity information corresponding to a physical quantity based on first and second detection signals from the first and second detection electrodes, and a failure diagnosis circuit. The circuit device includes first and second switches that are provided between first and second terminals to which the first and second detection signals are input and the detection circuit. The failure diagnosis circuit performs a failure diagnosis, based on a detection result of the detection circuit when connection states of the first and second switches are changed.