Robot Sensor Unit With Adaptive Sampling for Failure Diagnosis
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Solution Overview
Problem
Existing techniques for generating failure diagnosis data from sensors on moving robots face challenges in detecting defects when the absolute value of the data is close to zero, leading to missed defect detection due to reduced sampling frequency.
Innovation Solution
A sensor unit with an acceleration sensor that specifies periods where the absolute value of acceleration is equal to or less than a threshold, outputting failure diagnosis data only during these periods to enhance defect detection while reducing data amount and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the sampling frequency is lowered when the absolute value of acceleration data is equal to or less than a predetermined threshold, then the data amount of failure diagnosis data is reduced, but the defect detection reliability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the sampling strategy based on the operational state. When acceleration absolute value exceeds the threshold (indicating acceleration/deceleration phases), high-frequency sampling is maintained for defect detection. When acceleration absolute value is below the threshold (indicating constant speed phases), low-frequency sampling is used to reduce data amount. This localized adaptation of sampling quality resolves the contradiction between data reduction and defect detection reliability.
2Productivity
If the sampling frequency is lowered to reduce data amount, then the transmission efficiency is improved, but the defect detection capability deteriorates
Solution Approach 1:
The patent implements dynamics by making the sampling frequency adaptive rather than static. The sampling frequency dynamically changes based on the acceleration state: high frequency during acceleration/deceleration when defects are more likely to manifest, and low frequency during constant speed movement when data reduction is prioritized. This dynamic adjustment resolves the contradiction between transmission efficiency and defect detection capability.
Data Source
AI summary
A sensor unit, a control method, and a recording medium are provided for reducing data amount of failure diagnosis data while detecting a failure of a device performing work while moving more reliably. The disclosure includes an output limiting part outputting the failure diagnosis data only for a period in which an absolute value of the acceleration is equal to or less than a predetermined threshold.