A new method of sensor fault diagnosis for under-measurement system based on space geometry approach

Sensor fault cannot be converted to system equation under the condition of under- measurement system. Aiming to solve this problem, we present a new method which treats sensor fault as state variable to enforce fault diagnosis. Firstly, the system model of sensor fault is constructed by putting sensor fault into the state equation. Then, the residual generator is designed using the space projection operation to solve the relevant parameter matrices. Since the proposed algorithm satisfies one-to-one correspondence of faults and residuals, it can achieve single and multiple sensors FDI. Simulation results show the effectiveness of the proposed approach.