Capacitive Throttle Position Sensing for Gas Valve Misstep Errors
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Solution Overview
Problem
Existing systems for determining the position of a throttle in a gas valve are prone to errors due to stepper motor missteps, leading to inaccurate regulation of gas flow and air-to-gas ratio in combustion processes.
Innovation Solution
A throttle position measurement system that utilizes a conductive blade and housing forming a capacitor, where capacitance changes represent the throttle's position, providing an independent verification of the throttle's opening and flow regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stepper motor is used to move the throttle, then the valve can be positioned to regulate gas flow, but errors occur in determining the valve positioning due to missed steps
Solution Approach 1:
The patent replaces the mechanical step-counting method with a capacitive sensing system. A conductive blade connected to the throttle and a conductive housing form a capacitor whose capacitance varies with the throttle position. This electrical measurement system substitutes the mechanical stepper motor step-counting, providing direct and accurate position feedback without relying on motor step accuracy.
2Reliability
If flame detection methods are used to verify combustion, then combustion quality can be monitored, but these methods are ineffective with hydrogen combustion
Solution Approach 1:
The capacitive throttle position measurement system serves multiple functions: it accurately measures throttle position for gas flow regulation and provides reliable operation data for various combustion types including hydrogen. The system is universally applicable across different fuel types because it measures mechanical position rather than detecting combustion characteristics, making it versatile for both traditional hydrocarbon and hydrogen combustion applications.
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
Ensures accurate and reliable measurement of throttle position, ensuring precise air-to-gas ratio even in situations where flame detection methods are ineffective, such as with hydrogen combustion, enhancing safety and operational efficiency.
Implementation Method 1
A throttle position measurement system that utilizes a conductive blade and housing forming a capacitor, where capacitance changes represent the throttle's position
Data Source
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AI summary
A system for measuring position of a gas valve throttle (212) is provided, the system comprising a gas valve throttle (212), arranged to adjust the flow of a gas; a stepper motor (204) connected to the throttle (212) by a connecting member (205), the stepper motor (204) being arranged to move the connecting member (205) and the throttle (212); a first member (203), arranged to be movable together with connecting member (205); a second member (201), arranged such that the movement of the of the first member (203) relative to the second member (201) changes an electrical parameter representative of the position and/or movement of the gas valve throttle (212).