Adaptive Tolerance Threshold for Motion Detection
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Solution Overview
Problem
Existing safety-related monitoring systems in machine systems are prone to unnecessary shutdowns due to minimal impermissible movements caused by external influences like mechanical vibrations, leading to reduced availability and potential safety risks from prolonged slow drift in incorrect directions.
Innovation Solution
A device and method that continuously recalculates a tolerance threshold for permissible movements, adapting it to the object's position only when moving in a permissible direction, allowing slight impermissible movements without shutdown while ensuring safety by switching off the system when the threshold is exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed tolerance threshold is used for safety monitoring, then the system is simple to operate, but it causes unnecessary shutdowns due to minimal impermissible movements from external influences
Solution Approach 1:
The patent applies the dynamics principle by making the tolerance threshold adaptive rather than fixed. The evaluation unit continuously adjusts the tolerance threshold based on the current permissible direction of movement, allowing the threshold to dynamically respond to changing operational conditions while maintaining safety requirements
Solution Approach 2:
The patent implements feedback by continuously monitoring the direction of movement and using this information to adjust the tolerance threshold. The system evaluates measurement signals to determine movement direction and feeds this information back to adaptively set appropriate tolerance thresholds, preventing both unnecessary shutdowns and safety compromises
2Productivity
If the tolerance threshold is continuously adapted to position changes, then the system avoids unnecessary shutdowns, but it may fail to detect dangerous slow drifts in impermissible directions
Solution Approach 1:
The system dynamically adapts the tolerance threshold only when movement occurs in a permissible direction, while maintaining a fixed threshold when movement is in an impermissible direction. This dynamic behavior allows the system to accommodate normal operational variations without compromising safety detection
Solution Approach 2:
The evaluation unit continuously monitors movement direction and uses this feedback to determine whether to adapt or maintain the tolerance threshold. When impermissible direction movement is detected, the system maintains a strict fixed threshold to ensure dangerous drifts are detected, while allowing adaptive threshold adjustment during permissible operations
Data Source
Figure 1
AI summary
The present invention solves the problem of improving a motion monitoring system to enhance the safety and availability of a machine system by providing a device for detecting the position, relative movement, angular position, and/or rotation of a moving object, comprising at least one detector and electronic means for evaluating the measurement signals supplied by the at least one detector. The electronic means are configured to determine a tolerance threshold that defines a permissible range for movements of the object in an impermissible direction and to recalculate the tolerance threshold when the observed object moves in a permissible direction. With the present invention, permissible movements of machine parts within normal tolerances can also be better detected in an impermissible direction.This can improve the availability of the system, avoid unnecessary shutdowns of a machine system and superfluous maintenance work.