Fuel Metering Valve Position Sensing for Pump Health Monitoring
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Solution Overview
Problem
The performance of gas turbine engine fuel control systems is hindered by the lack of direct measurement of fuel pump performance, making it difficult to assess the remaining life of the fuel metering unit or the fuel pump.
Innovation Solution
A fuel metering unit with a metering valve and sensor system, where the valve body is movable within a housing and includes recessed regions and windows, allowing the sensor to detect the position and quantify fuel flow, enabling the assessment of fuel pump performance without direct contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fuel pump performance measurement methods are used, then the system structure remains simple, but the ability to assess fuel pump performance and remaining life is insufficient
Solution Approach 1:
A magnetic coupling mechanism is introduced as an intermediary between the drive shaft and valve body. The drive shaft contains a magnet that magnetically couples to a ferromagnetic material in the valve body, enabling force transmission and position indication without direct mechanical contact or complex sensors. This intermediary approach enables precise measurement of valve body position (indicating fuel pump performance) while maintaining relatively simple system architecture.
2Measurement precision
If direct mechanical contact measurement methods are used, then measurement accuracy improves, but system reliability decreases due to wear and contact issues
Solution Approach 1:
The patent replaces direct mechanical contact measurement with magnetic field-based position indication. The drive shaft contains a magnet that creates a magnetic field interacting with ferromagnetic material in the valve body. This magnetic interaction transmits position information without mechanical contact, eliminating wear between measurement components while maintaining accurate position detection capability.
3Loss of information
If complex sensor systems are implemented to measure fuel pump performance, then measurement capability improves, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential information needed for fuel pump performance assessment - the position of the valve body - and uses a simplified magnetic coupling mechanism to obtain it. Rather than implementing complex sensor systems to measure multiple parameters, the invention focuses on extracting the single most important indicator (valve body position, which correlates to fuel flow and pump performance) through a simple magnetic field interaction between the drive shaft and valve body.
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
Enables the quantification of fuel pump performance and detection of potential issues prior to failure, facilitating more accurate monitoring and maintenance without the need for a flowmeter.
Implementation Method 1
The sensor being arranged to provide a signal indicative of a position of the first window relative to the sensor
Data Source
AI summary
A fuel metering unit includes a metering valve and a sensor. The metering valve includes a valve body movably disposed within a valve housing. The valve body defines a first bore that extends from a first valve body end towards a second valve body end along a first axis and a first window that extends through the valve body along a second axis. The sensor extends at least partially through the valve housing and faces towards the first window. The sensor being arranged to provide a signal indicative of a position of the first window relative to the sensor.