Valve Controller Self-Calibration via Auxiliary Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Valve controllers often require calibration during installation and operation, which can be inconvenient due to the need for external tools or interfaces, especially in physically challenging environments or when tools are not available.
Innovation Solution
A self-calibration routine in the valve controller that uses auxiliary terminals to initiate internal calibration processes, eliminating the need for external interfaces or tools, with programmable timing and signal requirements for activation and completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a built-in user interface is added to the valve controller for calibration, then calibration capability is improved, but device complexity and cost increase
Solution Approach 1:
The valve controller is designed to perform self-calibration automatically using its existing auxiliary terminals and internal processing capabilities. The controller monitors signals on the auxiliary terminals, detects calibration initiation conditions, and executes calibration routines without requiring a separate user interface or external calibration tools, thus maintaining simplicity while enabling calibration functionality.
Solution Approach 2:
The auxiliary terminals, originally designed for other purposes, are made multi-functional to also serve as calibration initiation interfaces. This allows the same hardware components to perform multiple functions, eliminating the need for dedicated calibration buttons or interfaces, thereby reducing device complexity while maintaining calibration capability.
2Measurement precision
If external calibration tools are required for valve controller calibration, then calibration precision may be improved, but ease of operation deteriorates due to physical accessibility issues
Solution Approach 1:
The valve controller performs self-calibration using its own internal resources and existing auxiliary terminals, eliminating the need for external calibration tools. The controller can initiate and complete calibration routines autonomously by monitoring signals on the auxiliary terminals and executing internal calibration algorithms, making calibration accessible in physically challenging environments without compromising the process.
3Ease of operation
If auxiliary terminals are used to initiate self-calibration, then ease of operation is improved, but device complexity increases due to additional programming requirements
Solution Approach 1:
The system uses changes in electrical parameters (signal presence, impedance changes, or voltage levels) on the existing auxiliary terminals to trigger calibration modes. The processor monitors these parameter changes and transitions the controller into calibration routines accordingly. This approach leverages existing hardware with minimal additional programming, as the same terminals and processor are used for both normal operation and calibration initiation.
4Device complexity
If self-calibration routine is implemented without user interface, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The self-calibration routine incorporates feedback mechanisms where the processor monitors signals from the auxiliary terminals during calibration, adjusts calibration parameters based on detected conditions, and validates calibration results. The system can detect when calibration is needed, execute appropriate calibration algorithms, and verify completion, ensuring adequate precision while maintaining simplicity through automated feedback control.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A valve controller may have inputs that can be programmably set to one of several functions. A first function is for use as a event monitor, whereby a signal at the inputs may cause the valve controller to report an alert or send an alarm. A second function is to activate a self-calibration routine in the valve controller responsive to the signal where the valve controller tests and records the limits of valve travel. An optional pressure range calibration and performance tuner may also be activated in conjunction with the valve travel calibration. While the self-calibration routine is running, applying the signal a second time may cancel the self-calibration routine and restore system variables and modes to their state prior to initiating the self-calibration.