Upstream Valve Pressure Control for Fast Closed-Space Convergence
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Solution Overview
Problem
Conventional fluid control systems face challenges in stabilizing the pressure between upstream and downstream valves, leading to inaccurate flow rate control and reduced controllability due to pressure fluctuations, which can result in overshooting and increased convergence time.
Innovation Solution
A pressure control system that calculates the convergent pressure of a closed space using upstream and downstream pressures, and adjusts the upstream valve to maintain a predetermined target pressure, preventing overshooting and enabling high-speed control of convergent pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the upstream valve is fully closed and then opened to cause fluid flow, then the upstream pressure can reach the target pressure, but the pressure in the closed space exceeds the predetermined convergent pressure causing measurement inaccuracy
Solution Approach 1:
The system performs preliminary action by fully closing the downstream valve before opening the upstream valve to establish a sealed closed space. This preliminary configuration ensures that when the upstream valve is opened, the fluid flows into a predetermined closed volume, allowing the pressure to converge to a predictable value that improves measurement accuracy.
Solution Approach 2:
The system uses feedback by measuring the upstream pressure and comparing it with the predetermined convergent pressure. When the upstream pressure reaches or exceeds the target pressure, the system closes the upstream valve, creating a closed space with controlled pressure. This feedback mechanism ensures accurate flow rate measurement by maintaining pressure within the optimal range.
2Stress or pressure
If on-off control is performed on the upstream valve to prevent pressure overshooting, then the pressure can be controlled, but the time until convergence increases
Solution Approach 1:
The system performs preliminary action by fully closing the downstream valve before operating the upstream valve. This creates a sealed closed space with known volume, which fundamentally changes the pressure dynamics. When the upstream valve is opened, the fluid flows into a confined space, causing rapid pressure convergence to a predictable value, thereby reducing convergence time while maintaining pressure control.
Solution Approach 2:
The system changes the system configuration parameter by closing the downstream valve to create a closed space, which fundamentally alters the pressure convergence characteristics. This parameter change transforms the open-system pressure behavior into closed-system behavior, enabling faster convergence and better controllability without requiring continuous on-off cycling of the upstream valve.
3Stress or pressure
If the upstream valve is closed when upstream pressure reaches target pressure, then pressure control is achieved, but the channel is blocked on downstream side causing pressure to exceed convergent pressure
Solution Approach 1:
The system performs preliminary action by closing the downstream valve before opening the upstream valve. This establishes a sealed closed space downstream of the fluid resistance, ensuring that when the upstream valve is closed at target pressure, the downstream side remains isolated. This preliminary configuration prevents pressure buildup that would otherwise occur when the channel is blocked, maintaining stable flow rate control.
Solution Approach 2:
The system inverts the conventional approach by closing the downstream valve first rather than closing the upstream valve first. This reversal of operation sequence fundamentally changes the system behavior: the downstream closure creates a sealed space that prevents pressure overshooting when the upstream valve is subsequently closed, thereby improving flow rate control stability.
Data Source
AI summary
The present invention controls convergent pressure of a closed space provided with a fluid resistance at high speed while an upstream valve provided on the upstream of the fluid resistance prevents overshooting. A pressure control system is provided with a fluid resistance in a channel forming a closed space and is configured to control pressure of the closed space by controlling an upstream valve provided on the upstream of the fluid resistance. The pressure control system includes a convergent pressure arithmetic unit and a valve controller. The convergent pressure arithmetic unit calculates convergent pressure of the closed space when the upstream valve is fully closed using at least one of upstream pressure and downstream pressure on the fluid resistance in the channel. The valve controller compares the calculated convergent pressure with a predetermined target convergent pressure and fully close the upstream valve based on the result of the comparison.