Control Method of Electronic Gas Circuit in Gas Chromatography

CN120428544BActive Publication Date: 2025-08-29ZENITH SHANGHAI AUTO TECH CO LTD
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Patent Information

Application Number
CN202510929127.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-07
Publication Date
2025-08-29
Estimated Expiration
2045-07-07

AI Technical Summary

Technical Problem

In the existing electronic gas circuit control of gas chromatography, the PID controller can easily cause the integration term error to accumulate when the gas source pressure changes suddenly, resulting in the system being unable to reach the set value for a long time, which in turn causes severe pressure overshoot and damages the chromatographic column, inlet or detector.

Method used

Build a gas path elastic parameter model, embed it into the PID controller, adjust the accumulated rate of the integral term in real time, and automatically adjust the controller structure to a non-PID structure when a non-stable scenario is detected, freeze or suppress the integration term update, and perform adaptive optimization after recovery.

Benefits of technology

It effectively avoids integral saturation and control overshoot caused by gas source disturbance, improves the stability and safety of the gas chromatography system, and enhances the stability and safety of the regulation process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses a method for controlling an electronic gas circuit of a gas chromatography, and specifically relates to the technical field of electronic gas circuit control. By constructing a gas circuit elasticity parameter model including a maximum instantaneous flow rate, a maximum pressure difference response rate and a gas source recovery delay time, dynamic adjustment of the integral term of a PID controller is achieved. During the control process, feedback values ​​and control signals are collected in real time to judge the system operation scenario. When an unstable state is encountered, the control structure is automatically switched to a non-PID mode and the integral path is frozen. After the system regains stability, the PID structure is smoothly restored, and the gas circuit elasticity parameters are adaptively optimized based on the adjustment effect. The method can be widely used in high-precision gas chromatographs to achieve safer, more efficient and intelligent gas circuit control.
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Citation Information

Patent Citations

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