Amplifier-Based Failure Diagnosis Circuit for Resonance False Flags

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Solution Overview

Problem

Existing physical quantity detection devices are prone to erroneous failure diagnosis due to resonance caused by mechanical impacts or vibrations, leading to incorrect detection of failures even when the device is functioning correctly.

Innovation Solution

A physical quantity detection circuit with a failure diagnosis system that includes an amplifier circuit, failure diagnosis circuit, mask signal output circuit, and disabling determination circuit to accurately diagnose device failures by comparing signal levels and masking erroneous signals, thereby improving reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If failure diagnosis is performed by monitoring signals from the amplifier circuit, then reliability of failure detection is improved, but false failure diagnosis occurs due to resonance signals from mechanical impacts

Engineering Contradiction:

Improvefailure detection reliabilityVSAvoidfailure diagnosis accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

A mask signal output circuit is introduced as an intermediary component between the amplifier circuit and the failure diagnosis circuit. This mask signal circuit monitors the output signals from the amplifier and generates mask signals to inhibit false failure flags when resonance occurs, thereby preventing erroneous failure diagnosis while maintaining reliable failure detection

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system changes the operational parameters of the amplifier circuit by adjusting gain settings and applying notching filters to suppress resonance frequencies. The mask signal output circuit dynamically adjusts mask signal levels based on detected resonance conditions, allowing the system to adapt to different operational states and distinguish between normal resonance and actual failures

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the amplifier circuit gain is increased to improve signal detection sensitivity, then measurement precision is improved, but resonance signals are amplified causing false failure diagnosis

Engineering Contradiction:

Improvesignal detection sensitivityVSAvoidresonance interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The mask signal output circuit converts the harmful resonance signals into useful information by detecting their presence and using them to generate appropriate mask signals. The resonance signals, which would normally cause false failure diagnosis, are instead used to trigger the mask signal mechanism that prevents erroneous diagnosis

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The amplifier circuit employs dynamic gain control and adjustable notching filters that can adaptively suppress resonance frequencies while maintaining sensitivity to actual failure signals. The system dynamically adjusts its parameters based on the operational state, allowing high gain for sensitivity when needed while suppressing resonance interference when it occurs

Inventive Principle:

Principle #15Dynamics

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 system effectively distinguishes between normal and faulty operation by disabling false failure flags, enhancing the accuracy of failure diagnosis and reducing erroneous diagnoses due to resonance-induced signals.

Implementation Method 1

an amplifier circuit that amplifies a signal output from a physical quantity detection element

Methodology Applied

Scientific EffectElectrical amplification:

Implementation Method 2

a physical quantity detection element that detects a physical quantity

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS20260002783A1Physical Quantity Detection Circuit And Physical Quantity Detection Device

Publication Date: 2026.01.01 SEIKO EPSON CORP

AI summary

A physical quantity detection circuit includes: a physical quantity detection signal output circuit that includes an amplifier circuit that amplifies a signal output from a physical quantity detection element, and outputs a physical quantity detection signal corresponding to a physical quantity; a failure diagnosis signal output circuit that outputs a failure diagnosis signal based on a signal output from at least one of a plurality of amplifiers included in the amplifier circuit; a failure diagnosis circuit that performs failure diagnosis based on the failure diagnosis signal and outputs a failure flag indicating a result of the failure diagnosis; a mask signal output circuit that compares a level of a signal output from each of the plurality of amplifiers with each of a plurality of set detection levels and outputs a mask signal based on a result of the comparison; and a disabling determination circuit that disables the failure flag based on the mask signal.