Valve Pressure Control Using Dead Volume Parameter Mapping
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Solution Overview
Problem
Users face difficulty in setting optimal control parameters for digital closed-loop control units of digital valves due to the non-proportional and nonlinear relationship between dead volume changes and control parameters, making it hard to adapt valve behavior effectively.
Innovation Solution
A device with a dead volume setting unit that adjusts multiple control parameters simultaneously using a single dead volume parameter, utilizing characteristic curves determined through hydraulic tests and implemented via software with a graphical user interface, ensuring automatic consideration of the relationship between control parameters and dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple control parameters are adjusted to adapt to dead volume changes, then the valve behavior can be optimized, but the complexity of parameter setting increases significantly
Solution Approach 1:
The patent combines multiple control parameters (proportional band, integral time, derivative time, and current limits) into a single dead volume parameter. When the user sets one dead volume parameter, the control unit automatically calculates and adjusts all necessary control parameters based on stored characteristic curves, transforming a complex multi-parameter adjustment task into a simple single-parameter setting.
Solution Approach 2:
The control unit acts as an intermediary between the user and the complex control parameters. The user interacts with a simple dead volume parameter through the graphical interface, and the control unit mediates by automatically translating this single parameter into the appropriate settings for multiple control parameters using pre-stored characteristic curves and mathematical relationships.
2Adaptability or versatility
If multiple control parameters are manually adjusted to optimize valve behavior, then adaptation to different dead volumes is possible, but the time and effort required increases
Solution Approach 1:
The control unit stores characteristic curves and mathematical relationships in advance during manufacturing or initial setup. These pre-calculated relationships between dead volume and control parameters allow the system to instantly determine optimal settings when a user inputs a dead volume parameter, eliminating the need for time-consuming manual trial and error adjustment during operation.
Solution Approach 2:
The control unit performs self-adjustment by automatically calculating and setting all control parameters based on the single dead volume parameter provided by the user. The system uses stored characteristic curves and internal algorithms to autonomously determine the optimal proportional band, integral time, derivative time, and current limits without requiring user expertise or iterative manual adjustment.
3Ease of operation
If the relationship between control parameters and dead volume is made linear and proportional, then parameter setting becomes simpler, but the accuracy of pressure control decreases
Solution Approach 1:
The system uses stored characteristic curves that contain non-linear relationships between dead volume and control parameters. When the user inputs a dead volume parameter, the control unit retrieves the appropriate non-linear values from these curves, allowing the system to maintain both simplicity of operation (single parameter input) and precision of pressure control (accurate non-linear parameter relationships).
Data Source
AI summary
A device for controlling a valve with an electromagnet having a coil fed by a current, includes a closed-loop control unit configured to control the current using a closed-loop control circuit, the closed-loop control circuit having a plurality of elements which are set by a plurality of control parameters to generate an actual pressure value at the valve, the actual pressure value depending upon the dead volume. The device includes a dead volume setting unit configured to adapt to a change in dead volume while accounting for a nonlinear relationship between the dead volume and the plurality of control parameters by simultaneously setting the plurality of control parameters based upon a single dead volume parameter.