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Fault Detection, Isolation, and Recovery

Design algorithms and applications for failure detection, recovery, and management

When system faults occur in your Stateflow^® model, detect and isolate them by using SimStates. Design patterns that enable your safety-critical model to recover from system failures by using redundant logic, explicit transitions for every state, and filtering out transient signals. Use SimStates to test your model at specific fail times without rerunning the entire simulation.

Topics

Reduce Transient Signals with Debounce Logic

Learn to design a state machine with switch logic that is resilient to transient signals.

Test a Chart with Fault Detection and Redundant Logic

Test the response of a chart to failures by using fault detection and redundant logic.

Map Fault Conditions to Actions in Truth Tables

Use truth tables to map fault conditions of a system to their consequent actions.

Design for Isolation and Recovery in a Chart

Learn how to detect system faults and recover from failure modes.

Featured Examples

Modeling a Fault-Tolerant Fuel Control System

This example shows how to combine Stateflow® with Simulink® to efficiently model hybrid systems. This type of modeling is particularly useful for systems that have numerous possible operational modes based on discrete events. Traditional signal flow is handled in Simulink while changes in control configuration are implemented in Stateflow. The model described below represents a fuel control system for a gasoline engine. The system is highly robust in that individual sensor failures are detected and the control system is dynamically reconfigured for uninterrupted operation.

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Modeling a Launch Abort System

This example shows how to model a launch abort system. An aircraft is launched into outer space. If an anomaly or fault occurs during the launch, the operation is aborted, and the aircraft is sent back down to Earth.

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Fault Detection Control Logic in an Aircraft Elevator Control System

This example shows how to design a fault detection, isolation, and recovery (FDIR) application for a pair of aircraft elevators with redundant actuators. The fault detection control logic used in this model is the same that is used in the Avionics subsystem of the Aerospace Blockset™ example entitled "NASA HL-20 with Optional FlightGear Interface."

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