Turbine Engine Ps3 Model Resetting for Pressure Sensor Arbitration
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Solution Overview
Problem
Turbine engines experience false pumping detections due to deviations in static pressure measurements, leading to operational impacts and safety concerns, as existing thermodynamic models struggle to accurately reflect real values, resulting in erroneous arbitration between sensor channels.
Innovation Solution
A method for resetting the static pressure model in a turbine engine using a compressor speed-based model, which involves measuring pressure values, resetting the model using integral correction, and selecting the closest acquisition channel to the reset model to improve arbitration and reduce false detection events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermodynamic model is used to arbitrate between two pressure sensors, then analytical redundancy is provided to resolve measurement deviations, but the model values are remote from real values leading to erroneous arbitration
Solution Approach 1:
The patent applies preliminary action by resetting the thermodynamic model before arbitration to ensure it reflects current operating conditions. The model is periodically reset using recent measurement data, so when arbitration is needed, the model starts from an accurate baseline rather than drifting values, preventing erroneous arbitration decisions.
Solution Approach 2:
The patent implements feedback by continuously comparing model predictions with actual sensor measurements and using this information to reset and update the model. This closed-loop approach ensures the model remains synchronized with real system behavior, improving both accuracy and arbitration reliability.
2Adaptability or versatility
If the Ps3 model is used for channel arbitration, then a third analytical quantity is provided, but sudden changes in selection occur causing false pumping detections
Solution Approach 1:
The patent applies preliminary action by resetting the Ps3 model to current operating conditions before performing arbitration. This ensures the model reflects the actual system state, preventing sudden erroneous switches between sensor channels that would trigger false pumping detections.
Solution Approach 2:
The patent applies preliminary anti-action by proactively resetting the model to prevent drift and divergence. This counteracts the tendency of the model to accumulate errors over time, which would otherwise lead to incorrect arbitration decisions and false channel switching.
3Reliability
If two independent pressure sensors are used to measure Ps3, then measurement redundancy is achieved, but deviation between channels causes false detections when voting is impossible
Solution Approach 1:
The patent uses the thermodynamic model as an intermediary to resolve conflicts between the two pressure sensors. Instead of directly comparing sensor readings, the model serves as a mediator that predicts the expected pressure, allowing the system to identify which sensor is deviating and make informed arbitration decisions.
Solution Approach 2:
The patent changes the parameter being monitored from raw pressure values to model residuals (difference between measured and predicted values). This transformation simplifies the arbitration logic by providing a clear metric for detecting sensor deviations and determining which channel to trust.
Data Source
AI summary
The present intention relates to a method for resetting the static pressure model (mod_Ps3(PCN25R)), called “Ps3 model”, upstream of a combustion chamber in a turbine engine comprising a compressor (3), the Ps3 model being used to arbitrate between two acquisition channels (V10, V20) of the static pressure (Ps3), called “Ps3 pressure”, upstream of the combustion chamber, the two acquisition channels (V10, V20) using two sensors (10, 20), the model expressing the pressure Ps3 as a function at least of the speed (PCN25R), called “PCN25R speed”, of the compressor (3), and comprising the following steps: E1: measuring a value of the pressure Ps3 using one of the two sensors (10, 20); E2: resetting the Ps3 model using the measurement of the value of Ps3.