Adaptive Fuel Metering Channel Selection for Turbomachine Stability
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Solution Overview
Problem
Conventional fuel injection systems in turbomachines experience oscillatory phenomena due to discrepancy anomalies between metering valve channels, particularly during acceleration and deceleration, leading to poor fuel flow rate control and thrust changes.
Innovation Solution
A method for managing the operation of a fuel injection system by selecting a metering unit channel based on the reliability of the flowmeter, adapting to its operational limitations to prevent switching between channels when measurements are unreliable, and using specific selection criteria to maintain stability during confidence and lack thereof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the known inspection method is applied to select metering valve channel during discrepancy anomaly, then fuel flow rate control is attempted, but oscillatory phenomena occur during acceleration and deceleration
Solution Approach 1:
The patent applies dynamics by making the channel selection method adaptive to operating conditions. The system dynamically switches between two selection methods: during acceleration/deceleration, it selects based on minimizing difference between measured and theoretical flow rates; during steady-state operation, it selects based on closest theoretical flow rate match. This dynamic adaptation eliminates oscillatory phenomena while maintaining control reliability across all operating regimes.
Solution Approach 2:
The patent changes the selection criterion parameter based on the operating regime. When the turbomachine is accelerating or decelerating, the system uses a time-responsive criterion (minimizing flow rate difference). When in steady-state, it uses a precision criterion (closest theoretical match). This parameter change resolves the contradiction by matching the selection method to the operational context.
2Measurement precision
If continuous inspection method is used to handle discrepancy anomaly, then channel selection is made based on theoretical flow rate, but poor channel choice occurs during rapid metering valve position changes
Solution Approach 1:
The system dynamically adjusts the channel selection criterion based on the rate of change of metering valve position. During rapid changes (acceleration/deceleration), it uses a time-responsive method that prioritizes minimizing flow rate difference. During steady-state operation, it switches to a precision method that prioritizes theoretical flow rate match. This dynamic approach resolves the time lag issue while maintaining measurement precision.
3Speed
If metering valve position changes rapidly during acceleration or deceleration, then fuel flow rate control responsiveness is improved, but time lag increases between position change and flow rate measurement
Solution Approach 1:
The patent implements a dynamic selection method that adapts to the speed of metering valve position changes. During rapid changes, it selects the channel that minimizes the difference between measured and theoretical flow rates, providing immediate responsiveness. During steady-state, it selects based on closest theoretical match, ensuring precision. This resolves the contradiction between speed and time lag.
Data Source
AI summary
The principal object of the invention is a method for managing the operation of a metering unit of a turbomachine fuel injection system, characterized in that a channel of the metering unit is selected according to the reliability of the injection system's flowmeter, determined by reliability conditions of the flowmeter providing information as to whether or not there is confidence in the flowmeter.