Press Detection Apparatus Vibration Filtering
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Solution Overview
Problem
Existing press detection apparatuses face challenges in accurately determining pressing operations on a press target while minimizing the influence of vibration, particularly in vehicle environments, due to complex methods requiring signal processing, time measurements, and frequency filtering.
Innovation Solution
A press detection apparatus that detects a pressing force in a predetermined cycle and determines a definitive value by comparing the change in measured values to a reference amount, using a simple method to reduce vibration influence without needing FFT conversions or time measurements, thereby allowing reliable pressing operation determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FFT conversion or frequency filtering is used to reduce vibration influence, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the necessary information from the load signal by comparing sequential measured values directly, rather than processing the entire frequency spectrum. This extraction approach achieves vibration filtering by taking out the essential pressing detection function while discarding the complex frequency analysis machinery.
Solution Approach 2:
The patent uses simple, disposable-like computational operations (sequential value comparisons) instead of expensive, complex signal processing algorithms. Each measured value is processed independently through simple threshold comparisons, avoiding the need for maintaining complex FFT or filtering state machines.
2Reliability
If FFT or filtering methods are applied to eliminate vibration, then reliability is improved, but processing time increases
Solution Approach 1:
The patent segments the signal processing into simple, independent sequential comparisons of individual measured values against thresholds. This segmentation breaks down the complex task of vibration filtering into discrete, time-efficient steps that can be executed rapidly for each sampling cycle.
Solution Approach 2:
The patent employs periodic sampling and comparison operations at fixed time intervals. By periodically measuring the load signal and immediately comparing sequential values against predetermined thresholds, the system achieves reliable vibration rejection through rhythmic, time-efficient processing cycles.
3Measurement precision
If complex signal processing is used to reduce vibration influence, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent enables the measurement system to self-filter vibration effects through automatic sequential comparison of measured values against thresholds. The system serves itself by using its own measured data to automatically distinguish pressing operations from vibration, eliminating the need for external complex processing assistance.
Solution Approach 2:
The patent extracts only the essential pressing detection function from the load signal through simple sequential value comparisons, removing the burden of complex signal processing while maintaining measurement precision. This extraction focuses computational resources on the core measurement task.
Data Source
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AI summary
In determining a definitive value, if a measured value detected at one timing changes by an amount less than a reference amount from a definitive value generated at a timing one cycle before the one timing, a definitive-value determination unit of a press detection apparatus determines the measured value detected at the one timing as a definitive value at the one timing, and if the measured value detected at the one timing has changed by an amount equal to or more than the reference amount from the definitive value at the preceding timing, the definitive-value determination unit determines a value obtained by adding the reference amount to the definitive value at the preceding timing as a definitive value at the one timing. This allows a value in which the influence of generated vibration is limited to be used in determination on a pressing operation.