Turbine Engine Speed Sensing Redundancy
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Solution Overview
Problem
Existing speed sensing systems in turbine engines are susceptible to component failures, leading to inaccurate speed signal detection and potential over-speed conditions due to varying output voltages, requiring complex error detection systems that are resource-intensive.
Innovation Solution
A redundant speed sensing system with a detection module that compares speed signals to predefined voltage limits and look-up tables to determine reliability, allowing for direct corrective action to prevent over-speed conditions, bypassing the processor for immediate operational control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex neural network error detection system is used, then sensor error detection capability is improved, but device complexity and resource requirements increase significantly
Solution Approach 1:
The error detection function is segmented from the main processor and implemented as a separate detection module with dedicated hardware circuits. This segmentation allows the detection module to operate independently with simplified logic, reducing overall system complexity while maintaining detection capability.
Solution Approach 2:
A dedicated detection module acts as an intermediary between the speed probe and the processor. This intermediary contains specialized error detection circuits that filter and validate sensor signals before they reach the processor, reducing the computational burden on the main system while improving detection reliability.
2Reliability
If the processor processes all speed signal data, then comprehensive control is achieved, but response time for critical errors increases
Solution Approach 1:
The detection module performs preliminary error detection and validation of speed signals before they are processed by the main processor. By pre-screening signals for errors and anomalies, the system can immediately identify critical issues without waiting for processor analysis, significantly reducing response time for safety-critical events.
Solution Approach 2:
The detection module implements a bypass mechanism that allows critical error conditions to be detected and responded to directly without routing through the processor. This skipping of the processor step enables immediate response to dangerous conditions such as overspeed events, eliminating processing delays.
3Reliability
If redundant detection mechanisms are added, then system reliability is improved, but device complexity increases
Solution Approach 1:
The error detection functionality is merged into a dedicated detection module that combines multiple detection functions (signal validation, error detection, reliability assessment) into a single integrated unit. This merging approach provides redundant verification capabilities while avoiding the complexity of multiple separate systems.
Solution Approach 2:
The detection module is designed as a multi-functional component that performs various detection tasks including signal validation, error detection, reliability assessment, and direct corrective control. This universal detection module provides comprehensive protection without requiring multiple specialized systems, reducing overall complexity.
Data Source
AI summary
A turbo machine includes a speed probe that is configured to detect a speed of a rotating feature. Engine controls are used by a processor to control operation of the turbo machine. The processor communicates with the speed sensor and receives the speed signal to produce a command signal. A detection module is arranged in parallel with the processor and communicates with the speed probe to receive the speed signal. The detection module compares the speed signal with data to determine whether the speed signal is reliable. In one example, the detection module bypassed the processor and sends a corrective command directly to an engine control device in response to an unreliable speed signal.