Rate-Based Fault Restart Control for Soft Error Tolerance
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Solution Overview
Problem
Aircraft electrical systems face limitations due to fixed fault thresholds for soft errors, leading to premature invocation of Failsafe mode and unnecessary system restrictions, especially at high altitudes during long flights.
Innovation Solution
Implementing a rate-based fault management scheme that allows an unlimited number of system restarts as long as the frequency of errors does not exceed a predetermined threshold, using a fault detection circuit with a system controller and a separate or integrated fault detection controller to monitor and manage error rates, thereby preventing excessive system restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed fault threshold is used for soft errors, then the system can detect electrical faults, but the system reaches the Failsafe mode prematurely and suffers unnecessary system restrictions
Solution Approach 1:
The patent transitions from a static fixed fault threshold to a dynamic rate-based threshold that adapts to the frequency of errors. The system monitors the rate of soft errors over time and compares it against a predetermined rate threshold, allowing the fault detection mechanism to respond dynamically to varying error conditions rather than triggering Failsafe mode based on a rigid count limit.
Solution Approach 2:
The patent changes the parameter used for fault detection from a fixed numerical threshold to a rate-based threshold with time components. By introducing temporal parameters (time windows, error rates per unit time), the system can distinguish between transient errors and persistent fault conditions, thereby reducing premature Failsafe mode invocations while maintaining reliable fault detection.
2Reliability
If the system allows unlimited restarts for soft errors, then the system tolerance to Single Event Effects is enhanced, but the error frequency may exceed acceptable limits and cause system instability
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the rate of soft errors and uses this information to control restart operations. The fault detection controller receives feedback about error occurrences, calculates the error rate, and adjusts system behavior accordingly - allowing restarts when error rates are acceptable and preventing them when rates exceed the threshold, thus maintaining system stability while tolerating Single Event Effects.
Solution Approach 2:
The patent introduces an intermediary rate-based threshold mechanism between the soft error detection and the Failsafe mode invocation. This intermediary layer analyzes the temporal pattern and frequency of errors before triggering system-wide restrictions, serving as a buffer that prevents premature Failsafe mode activation while still providing protection against excessive error rates that could indicate genuine system instability.
3Duration of action of stationary object
If a rate-based fault management scheme is implemented, then continuous operation is maintained without unnecessary Failsafe mode invocation, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining rate thresholds and time windows before system operation. Instead of implementing complex real-time analysis algorithms, the system uses predetermined parameters for error rate calculation and comparison. This approach extends continuous operation by avoiding unnecessary Failsafe mode invocations while keeping the implementation relatively simple through pre-computed reference values.
Data Source
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AI summary
A fault detection circuit includes a system controller (102) and a fault detection controller (104). The system controller includes at least one memory device to control at least one electrical system. The fault detection controller (104) communicates with the system controller to detect at least one fault of the system controller (102) and to control operation of the system controller based on comparison between a frequency of detected faults corresponding to the system controller and at least one frequency threshold value.