Pulse Shot Gas Flow Control Using Stored Filling Time Feedback
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Solution Overview
Problem
Conventional pulse shot-type flow rate control devices require a long response time to adjust gas flow rates to target levels due to inconsistent gas usage conditions and reliance on pressure differences for flow rate adjustments.
Innovation Solution
A pulse shot-type flow rate control device with a controller that calculates and stores optimal pressures and filling times to regulate gas flow rates, allowing for immediate pressure control and flow rate adjustments, reducing the need for sequential adjustments and improving response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the conventional pulse shot-type flow rate control device performs the first pulse shot in the same manner for each process and gradually changes the manner according to pressure difference, then the device can control gas flow rate, but the response time from the start of each process until the flow rate is adjusted to the target flow rate becomes long
Solution Approach 1:
The controller stores optimal filling times determined from pressure differences in previous processes. Before executing the first pulse shot in a new process, the controller retrieves and applies this pre-stored optimal filling time, eliminating the need to start from a standard filling time and gradually adjust. This preliminary preparation of control parameters directly reduces the response time to reach target flow rate.
Solution Approach 2:
The controller measures the pressure difference between the gas filling capacity and the downstream side during pulse shots, uses this feedback to determine optimal filling times, and stores these optimized parameters for future use. This feedback loop enables the system to learn from each process and continuously improve flow rate control efficiency, reducing response time in subsequent processes.
2Measurement precision
If the device uses pressure difference to determine filling time in each pulse shot, then the flow rate can be adjusted, but the control process becomes sequential and time-consuming
Solution Approach 1:
The controller determines and stores optimal filling times based on pressure differences before the actual pulse shot execution in each process. By preparing these optimal parameters in advance rather than adjusting them sequentially during the process, the system maintains precise flow rate control while significantly reducing the time required to achieve target flow rate.
Solution Approach 2:
The controller copies previously determined optimal filling times from past processes and applies them to current and future processes. This copying of optimized parameters eliminates the need to重新determine filling times from scratch, maintaining measurement precision while accelerating the control process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces the time required to stabilize gas flow rates at target levels, enhancing the device's response efficiency and accuracy.
Implementation Method 1
a pressure sensor for measuring a pressure in the gas filling capacity
Data Source
AI summary
A pulse shot-type flow rate control device including first and second shutoff valves, a tank, a pressure sensor, and a controller is caused to perform two or more processes. In each process, the controller repeats pulse shots of alternately causing the first shutoff valve and the second shutoff valve to open and close, changes a way of the pulse shots based on a pressure difference between the pressure after filling and the pressure after discharge, and controls a volume flow rate. In each process, the controller stores, as an optimal filling time, a filling time when the volume flow rate is controlled to a target flow rate, and opens and closes the first shutoff valve by using the optimal filling time in a first pulse shot in the next process.