Valve Parameter Acquisition: Simultaneous Gain, Hysteresis, and Intercept Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control valve systems cannot calculate input/output characteristic hysteresis and intercept simultaneously with gain calculation, limiting their ability to determine comprehensive control parameters.
Innovation Solution
A parameter acquiring device that operates the regulator valve in both opening and closing directions, acquiring specific data pairs at intermediate openings to calculate gain, hysteresis, and intercept using defined equations, allowing for simultaneous determination of these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the control valve system calculates only gain for input/output characteristics, then the calculation process is simple, but hysteresis and intercept parameters cannot be obtained simultaneously
Solution Approach 1:
The patent merges the calculation of gain, hysteresis, and intercept into a single integrated calculation process. By simultaneously acquiring valve opening signals and control signals at multiple intermediate openings during both opening and closing directions, the system computes all three parameters (gain G, hysteresis H, intercept C) in one operation rather than requiring separate calculation steps for each parameter.
Solution Approach 2:
The patent employs periodic reciprocating operation of the regulator valve, alternating between opening direction and closing direction. The control signal is changed in a specific sequence that periodically moves the valve through intermediate openings in both directions, enabling the acquisition of data pairs needed for calculating gain, hysteresis, and intercept simultaneously through this cyclic test procedure.
2Productivity
If separate calculation methods are used for gain, hysteresis, and intercept, then each parameter can be calculated independently, but the overall process requires multiple operations and increases time consumption
Solution Approach 1:
The patent combines multiple parameter calculations into a single operational sequence. By acquiring valve opening signals and control signals at four specific intermediate openings (first and second in opening direction, third and fourth in closing direction) and processing them together, the system calculates gain, hysteresis, and intercept simultaneously, eliminating the need for separate calculation operations for each parameter.
Solution Approach 2:
The patent performs preliminary data acquisition during the reciprocating operation, collecting all necessary valve opening signals and control signals at the specified intermediate openings before performing the actual parameter calculations. This preliminary collection of data during the valve's normal reciprocating motion enables subsequent simultaneous computation of all parameters without requiring additional operational cycles.
3Measurement precision
If the valve is operated in only one direction for parameter calculation, then the control signal changes are simpler, but hysteresis cannot be accurately determined
Solution Approach 1:
The patent utilizes periodic reciprocating operation of the regulator valve, systematically alternating between opening direction and closing direction. The control signal changes follow a specific sequence that moves the valve through intermediate openings in both directions, enabling the acquisition of data pairs that reflect the hysteresis behavior. This periodic bidirectional operation allows accurate determination of hysteresis by comparing the valve's response during opening versus closing cycles.
Data Source
AI summary
A parameter acquiring device for acquiring parameters for a control valve has a controlling valve operating unit, a valve opening signal acquiring unit and a parameter calculator. The controlling valve operating unit operates a controlling valve in an opening direction and in a closing direction by changing, in a specific sequence, a control signal that controls an opening of a regulator valve. The valve opening signal acquiring unit acquires a signal indicating an actual opening of the regulator valve. The parameter calculator acquires data pairs of control signals and valve opening signals. The parameter calculator calculates a parameter of the control valve based on the data pairs that have been acquired.