Control Valve Voltage Adaptation for Fast Flow Without Overshoot
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluid control apparatuses face challenges in setting an initial applied voltage close to the opening start voltage without causing overshoot, while maintaining response speed, especially due to fatigue in control valves and changes in opening start voltage.
Innovation Solution
A fluid control apparatus with a control valve, fluid sensor, voltage generation circuit, and valve controller that adjusts the initial driving voltage based on drive history information and usage environment temperature, allowing for precise control and preventing overshoot by varying the initial voltage according to the valve's fatigue and processing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the initial applied voltage is set to a value larger than the opening start voltage, then the response speed increases, but the flow rate overshoots largely
Solution Approach 1:
The patent applies dynamics by making the initial applied voltage adjustable rather than fixed. The control device changes the initial applied voltage based on the opening degree of the control valve, creating a dynamic adaptation mechanism that optimizes both response speed and overshoot prevention for different operating conditions
Solution Approach 2:
The patent changes the voltage parameter dynamically based on the valve opening degree. By adjusting the initial applied voltage according to the specific opening degree required, the system achieves optimal balance between fast response and precise control without excessive overshoot
2Manufacturing precision
If the initial applied voltage is set to a value close to the opening start voltage, then the flow rate overshoot is reduced, but the response speed decreases
Solution Approach 1:
The system dynamically adjusts the initial applied voltage based on the target opening degree, transitioning from static to dynamic control. This allows the system to optimize the balance between response speed and overshoot suppression for each specific control scenario
Solution Approach 2:
The patent implements parameter changes by modifying the initial applied voltage according to the required opening degree. This adaptive parameter adjustment enables the system to achieve both fast response and precise control by selecting optimal voltage values for different operating points
3Speed
If the opening start voltage is increased due to fatigue, then the initial applied voltage must be increased to maintain response speed, but this causes larger overshoot
Solution Approach 1:
The patent implements feedback by detecting the actual opening degree of the control valve and using this information to adjust the initial applied voltage. This closed-loop approach allows the system to adapt to changes in valve characteristics due to fatigue and maintain optimal control performance
Solution Approach 2:
The system dynamically adapts to changes in valve characteristics by continuously adjusting the initial applied voltage based on the detected opening degree. This dynamic adjustment compensates for fatigue-induced changes in the opening start voltage while maintaining precise control
Data Source
AI summary
Provided is a fluid control apparatus capable of setting, to a value as close as possible to an opening start voltage, an initial applied voltage applied when controlling a control valve so that a measured amount becomes a set amount from a fully closed state and capable of preventing occurrence of large overshoot while increasing a response speed. A valve controller inputs a voltage command for setting an initial driving voltage to be applied to a control valve to a voltage generation circuit in a case where the control valve is changed from a fully closed state to a predetermined opening degree, and includes a drive history storage unit that stores therein drive history information of the control valve. The controller is configured to change a value of the initial driving voltage in accordance with the drive history information.