I would like to know the advantages or disadvantages of Fault Detection & Isolation (FDI) based Fault Tolerant Control (FTC) and Fault Estimation (FE) based FTC scheme in handling sensor faults of a system. Which method is better at times in handling sensor faults of a nonlinear system with external disturbance? What are the limitations of each of this methods?
Specific suggestions and answers are welcome.
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The primary difference between FDI (Fault Detection and Isolation) based FTC (Fault Tolerant Control) schemes and fault estimation based FTC schemes is the way they address faults in a system.
FDI-based FTC schemes involve detecting and isolating faults in a system and then taking appropriate actions to compensate for the faults. These actions may include reconfiguring the system or switching to a backup system. The FDI approach is based on monitoring the system's inputs and outputs to detect changes in the system's behavior that may indicate the presence of a fault. Once a fault is detected, the system's control algorithm is modified to compensate for the fault.
On the other hand, fault estimation based FTC schemes focus on estimating the fault magnitude and then using this estimate to compensate for the fault. The estimation of the fault magnitude is usually done using a model of the system, and the fault estimation algorithm is designed to minimize the difference between the predicted system behavior and the actual system behavior. Once the fault magnitude is estimated, the system's control algorithm is modified to compensate for the fault.
In summary, FDI-based FTC schemes focus on detecting and isolating faults, while fault estimation based FTC schemes focus on estimating the fault magnitude. Both approaches can be effective in providing fault tolerance for a system, and the choice between them depends on the specific requirements of the system and the nature of the faults that need to be addressed
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