PID Control Device Variation Range Monitoring

Solution Overview

Problem

Existing PID control systems take a long time to update PID parameters when they deviate from an appropriate range, leading to decreased yield rates and increased running costs due to prolonged periods of suboptimal control.

Innovation Solution

A PID control device that continuously monitors the variation range of the control target and updates the PID parameters proactively, adjusting the proportional gain based on detected ranges to maintain optimal values, even when outside the appropriate range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PID parameter update is triggered only when disturbance in response waveform is detected, then the system maintains stability with conservative updates, but the period in which PID parameter value is outside appropriate range becomes long

Engineering Contradiction:

ImprovePID parameter update reliabilityVSAvoidperiod until PID parameter updating is completed

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary action by continuously monitoring the variation range of control target and proactively updating PID parameters before they completely depart from appropriate range. The update unit updates PID parameters based on whether variation range exceeds first or second ranges, preventing prolonged suboptimal control rather than reacting after disturbance detection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements continuous feedback by monitoring variation range of control target and using this information to dynamically adjust PID parameters. The update unit receives feedback about variation range and automatically updates PID parameters when ranges exceed thresholds, creating a closed-loop control that continuously optimizes parameters rather than relying on periodic disturbance-triggered updates.

Inventive Principle:

Principle #23Feedback

2Reliability

If PID parameter update is triggered only when disturbance in response waveform is detected, then false updates are avoided, but yield rate decreases due to prolonged suboptimal control

Engineering Contradiction:

ImprovePID parameter update accuracyVSAvoidyield rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system performs preliminary action by continuously monitoring the variation range of control target and proactively updating PID parameters before they completely depart from appropriate range. The update unit updates PID parameters based on whether variation range exceeds first or second ranges, preventing prolonged suboptimal control rather than reacting after disturbance detection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes parameters by updating PID parameters based on variation range thresholds. When variation range exceeds first range, PID parameters are updated to reduce proportional gain; when variation range is below second range, PID parameters are updated to increase proportional gain. This dynamic parameter adjustment maintains optimal control and improves yield rate.

Inventive Principle:

Principle #35Parameter changes

3Loss of time

If continuous monitoring and updating of PID parameters is implemented, then the period outside appropriate range is shortened, but device complexity increases

Engineering Contradiction:

Improveperiod with PID parameter outside appropriate rangeVSAvoidPID control system complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The system changes parameters by updating PID parameters based on variation range thresholds. When variation range exceeds first range, PID parameters are updated to reduce proportional gain; when variation range is below second range, PID parameters are updated to increase proportional gain. This dynamic parameter adjustment maintains optimal control and improves yield rate.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10558175B2PID control device, PID control method, and PID control program

Publication Date: 2020.02.11 OMRON CORP

AI summary

A technique capable of shortening a period in which value of a PID parameter is outside of an appropriate range is provided. A measured value acquisition functional unit processes a sensing signal of a sensor that measures a barrel and acquires a measured value of the barrel. A storage unit stores a target value of the barrel and a PID parameter. An operation amount calculation functional unit calculates an amount of operation using the PID parameter and a difference between the measured value and the target value. A first output unit and a second output unit output the amount of operation. A first updating functional unit updates the PID parameter through a first update process when the variation range is greater than a first range, and a second updating functional unit updates the PID parameter through a second update process when the variation range is less than a second range.