Control Device External Force Inference for Wear Detection
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Solution Overview
Problem
Existing control systems that utilize friction force, such as in machining devices, face challenges in accurately detecting tool wear when actions are varied, as they rely solely on rotation torque variations, which is insufficient for precise wear detection.
Innovation Solution
A control device and method that calculates an external force inferred value and velocity inferred value using a predetermined model, evaluating reliability based on the difference between actual and inferred values, and outputs the inferred external force only when reliability is designated, incorporating a mass coefficient and viscosity resistance parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wear detection is performed using only rotation torque value variation, then the detection method is simple, but the measurement precision is insufficient when actions are varied
Solution Approach 1:
The patent introduces an intermediary calculation process that uses a predetermined model to compute expected torque values based on actual velocity and operation conditions. This intermediary step allows comparison between actual torque and model-based torque to infer wear, providing more precise measurement while maintaining relatively simple implementation through standard computational methods.
Solution Approach 2:
The patent changes the detection parameters from solely torque value variation to a combination of velocity actual values, operation conditions, and model-based expected torque values. By incorporating multiple parameters and their relationships through a predetermined model, the system achieves higher measurement precision without proportionally increasing device complexity.
2Measurement precision
If a predetermined model with multiple parameters is used to infer external force, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The predetermined model serves multiple functions: it calculates expected torque values for wear detection, validates velocity consistency, and adapts to different operation conditions. This multi-functionality allows the same model structure to handle various scenarios without requiring separate detection systems for each condition, thereby improving precision without proportional complexity increase.
Solution Approach 2:
The system incorporates feedback mechanisms where the predetermined model continuously compares expected torque values with actual torque measurements, and adjusts wear inference based on velocity consistency validation. This feedback loop enables accurate external force inference while maintaining manageable complexity through iterative refinement rather than complex direct measurement.
3Adaptability or versatility
If wear detection is performed for varying actions, then the adaptability is improved, but the reliability of detection decreases due to insufficient data consistency
Solution Approach 1:
The patent implements dynamic adaptation where the predetermined model adjusts its expected torque calculations based on actual velocity values and specific operation conditions. The system dynamically validates whether velocity actual values match model predictions, and only performs wear detection when consistency is confirmed. This dynamic approach maintains reliability across varying actions by adapting detection criteria to current operational context.
Solution Approach 2:
The system performs preliminary validation of velocity consistency before executing wear detection. By first checking whether actual velocity values align with model predictions under current operation conditions, the system ensures data reliability is established beforehand. This preliminary action filters out inconsistent data, maintaining high detection reliability even when adapting to various actions and conditions.
Data Source
AI summary
The invention provides a control device comprising: an actual value obtaining part, obtaining a torque actual value and a velocity actual value, wherein the torque actual value represents a torque generated by the driving source and the velocity actual value represents a velocity of the motion body; an inferring part, which calculates an external force inferred value and a velocity inferred value every other operation period based on the torque actual value by using an operation formula of a predetermined model representing driving of the motion body, wherein the external force inferring value represents an external force generated by the control system; and an output part, evaluating a reliability of the external force inferred value based on the velocity inferred value calculated together if the inferring part calculates the external inferred value, and effectively outputting the external force inferred value when it is judged that there is a designated reliability.