PID Controller Integration Initial Value for Temperature Stability
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Solution Overview
Problem
Existing PID controllers face challenges in rapidly achieving set temperatures without overshoot, as they often react too quickly, leading to temperature overshoot or take too long to stabilize, due to limitations in their proportional, integral, and derivative control mechanisms.
Innovation Solution
A method is introduced to determine an integration initial value for the PID controller by performing on-off switching during automatic tuning, calculating an estimated initial value based on temperature amplitude and differences, and adding it when approaching the set temperature to reduce reaction time and prevent overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the PID controller uses traditional integration control from 0 to set temperature, then the temperature control is stable, but the steady state time is lengthy and temperature drops may occur
Solution Approach 1:
The patent applies preliminary action by calculating and setting an initial integration value before the temperature control process begins. This initial value is determined based on the relationship between heating power and temperature change rate, allowing the integration control to start from a predetermined value rather than zero, thereby reducing the time to reach steady state and preventing temperature drops during the integration process
2Speed
If the PID controller increases proportional parameter for fast temperature response, then the temperature reaction is fast, but temperature overshoot occurs
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the integration parameter based on the current temperature and the predetermined initial integration value. Instead of using a fixed integration parameter, the system modifies the integration component adaptively, allowing fast temperature response without causing overshoot by controlling the integration contribution appropriately at different temperature stages
Data Source
AI summary
A method for determining integration initial value of PID controller is applied to obtain an integration initial value for temperature control and to fast eliminate stability error. This method uses a set temperature value and temperature error setting to perform on-off switching with the range of temperature error setting after an automatic tune is activated. An amplitude for the highest and the lowest temperature curve is obtained. An integration is calculated based on the amplitude, the temperature value and the lowest temperature to obtain an estimated control initiation value for PID controller performing temperature. A stabilizing integration value is added when temperature is near a preset value to reduce temperature reaction time. Therefore, the dilemma of temperature overshoot caused by fast reaction and low reaction to prevent temperature overshoot can be solved.