1. Univ logo D ETECTION AND I SOLATION OF A S ENSOR D RIFT F AULT Yilun Zhou Prof. Thomas Parisini Imperial College London UKACC PhD Presentation Showcase

2. Univ logo UKACC PhD Presentation Showcase Slide 2 Introduction  Background Complex control systems and demand for fault toleranceComplex control systems and demand for fault tolerance Process fault and sensor fault in nonlinear systemsProcess fault and sensor fault in nonlinear systems Model-based fault detection and isolation schemes (FDI)Model-based fault detection and isolation schemes (FDI) Time evolution of faults: abrupt and incipient faultsTime evolution of faults: abrupt and incipient faults  Objectives A class of nonlinear systems with sensor drift faultsA class of nonlinear systems with sensor drift faults Adaptive and less conservative thresholdAdaptive and less conservative threshold

3. Univ logo UKACC PhD Presentation Showcase Slide 3 Problem Formulation and Methodology  A class of nonlinear MIMO system with sensor drift faults  Detection Estimators and Isolation Estimators  Residual and Threshold  A class of nonlinear MIMO system with sensor drift faults  Detection Estimators and Isolation Estimators  Residual and Threshold > s Drift faults, s Isolators. d crossing Any crossing excludes faulty assumption.

4. Univ logo UKACC PhD Presentation Showcase Slide 4 Simulation Result  Detection At t = 13s, a fault occurs. Then the fault is detected at t = 16.64s

5. Univ logo UKACC PhD Presentation Showcase Slide 5 Simulation Result  Isolation There is a crossing in isolator 2. The possibility of fault occurrence in Sensor 2 is excluded. Drift fault occurred in Sensor 3

6. Univ logo UKACC PhD Presentation Showcase Slide 6 Conclusion and Future work  Conclusion: Adaptive threshold increases robustness and stabilityAdaptive threshold increases robustness and stability Fault compensation in isolators improves performanceFault compensation in isolators improves performance  Future Work: Design a FDI approach for a hybrid sensor faultDesign a FDI approach for a hybrid sensor fault Design a distributed fault diagnosis approachDesign a distributed fault diagnosis approach Design a benchmark test using the FDI schemeDesign a benchmark test using the FDI scheme