Abstract:

In the processing of state，actuator and sensor fault detection and isolation，the last is the most difficult.In the under-measurement system and the sensor redundancy system，this problem becomes more difficult.Firstly，three typical mathematical models of sensor fault containing lock-in-place，gain time-varying and bias time-varying are established.Secondly，the output equation to converted sensor fault into state disturbance of the dynamic system is reported.The problem of converted result is processed with least-square solutions and the basic solutions in the under-measurement system.For the sensor redundancy system，two parallel residual generators are constructed using twice system state.Then，the residual generator which can well be used to fault detection and isolation is designed.Finally，the effectiveness of this method is verified through example simulation.