Valve Shaft Position Detection Using Color Sensors
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Solution Overview
Problem
Existing valve position detection systems are bulky, complex, and prone to wear, requiring precise manufacturing and assembly, which limits their use in high-vibration environments and increases overall valve size.
Innovation Solution
A valve position detection system using colour sensors to determine the rotational position of a valve shaft, utilizing colour indicators on the shaft and a corresponding sensor to detect reflected light, eliminating the need for micro-mechanical switches and allowing for a smaller, simpler, and more robust assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro-mechanical switches are used for position detection, then position detection accuracy is achieved, but device complexity and size increase
Solution Approach 1:
The patent replaces the mechanical micro-mechanical switch system with an optical detection system using a colour sensor and coloured indicators. This substitution eliminates the need for complex mechanical switches while maintaining position detection accuracy, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent uses coloured indicators (different colors at different positions) on the shaft that are detected by a colour sensor. This approach simplifies the detection mechanism by using optical color recognition instead of mechanical switches, reducing device complexity while preserving measurement precision
2Measurement precision
If micro-mechanical switches are used for position detection, then position detection is achieved, but wear and reliability in high-vibration environments worsen
Solution Approach 1:
The patent replaces mechanical contact-based micro-mechanical switches with a non-contact optical detection system using colour sensors and coloured indicators. This eliminates mechanical wear and improves reliability in high-vibration environments while maintaining position detection accuracy
Solution Approach 2:
The patent introduces coloured indicators as an intermediary medium between the shaft and the colour sensor. This intermediary enables position detection through optical color recognition without mechanical contact, eliminating wear and improving reliability while preserving measurement precision
3Measurement precision
If irregular shaft shape and high tolerance manufacturing are used, then accurate position determination is achieved, but manufacturing time and cost increase
Solution Approach 1:
The patent uses coloured indicators applied to the shaft surface instead of requiring the shaft to have an irregular shape. This approach allows for accurate position determination while using standard shaft geometry and simpler manufacturing processes, reducing both manufacturing time and assembly time
Solution Approach 2:
The patent uses coloured indicators as visual copies or markers of position information on the shaft. This allows position determination through optical detection of colors rather than through precise mechanical tolerances, significantly reducing manufacturing and assembly time while maintaining accuracy
4Measurement precision
If complex mechanical sensor construction is used, then position detection is achieved, but overall valve size increases
Solution Approach 1:
The patent replaces the bulky mechanical sensor assembly with a compact optical detection system consisting of a colour sensor and coloured indicators. This substitution dramatically reduces the overall valve assembly size while maintaining position detection capability
Solution Approach 2:
The patent extracts the position detection function from the mechanical domain and implements it in the optical domain. This extraction allows for a much more compact implementation, reducing the volume of the valve assembly while preserving measurement precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The colour sensor-based system reduces the overall size of the valve assembly, minimizes wear, and simplifies assembly, while maintaining accurate position detection without the need for precise machining and calibration.
Implementation Method 1
utilizing colour indicators on the shaft and a corresponding sensor to detect reflected light
Data Source
Figure 1~5
Figure 5A
Figure 6
AI summary
A position detection assembly for detecting a spatial position of a moveable element (11), the assembly comprising a colour sensor (6) and one or more colour indicators (8) provided on a surface of the moveable element, the colour sensor being spaced from the surface of the moveable element and arranged to emit light onto the surface and detect light reflected from the surface and to determine the position of the element based on the reflected light.