Active fault diagnosis for hybrid systems based on sensitivity analysis and EKF

Abstract

An active fault diagnosis (AFD) approach for different kinds of faults is proposed. The AFD approach excites the system by injecting a so-called excitation input. The input is designed off-line based on a sensitivity analysis in order that the maximum sensitivity for each individual system parameter is obtained. Using the maximum sensitivity results in better precision in the estimation of the corresponding parameter. The fault detection and isolation is done by comparing the nominal parameters with those estimated by an extended Kalman filter. In this study, Gaussian noise is used as the input disturbance as well as the measurement noise for simulation. This method is implemented on a large scale livestock hybrid ventilation model which was obtained during previous research.

Active fault tolerant control of piecewise affine systems with reference tracking and input constraints

“…The AFTC procedure is as follows: Normal control law: when no fault in the system is detected, the supervisor selects this control law in the closed‐loop system to satisfy the control objectives. FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and . AFDI controller: once, after the supervisor receives a message from FD block denoting an abnormal behavior of the system, the supervisor selects the active fault diagnosis control law in order to isolate and identify the current faults in the system. When the AFDI controller isolates and identifies the faults, it informs the supervisor. Family of PFTC: it consists of a family of passive fault tolerant controllers designed to be robust against specific set of faults.…”

“…FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and .…”

“…The design of the AFDI is also not detailed in the following section. The reader is referred to the corresponding literatures as for instances paper and . We focus in Section 5 on the PFTC design method.…”

“…As the results, our AFTC technique reduces the delay period, when the system is controlled by irrelevant controller, by the help of AFDI block. The readers are referred to and for more details on AFDI controller design.…”

Active fault tolerant control of piecewise affine systems with reference tracking and input constraints

“…The AFTC procedure is as follows: Normal control law: when no fault in the system is detected, the supervisor selects this control law in the closed‐loop system to satisfy the control objectives. FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and . AFDI controller: once, after the supervisor receives a message from FD block denoting an abnormal behavior of the system, the supervisor selects the active fault diagnosis control law in order to isolate and identify the current faults in the system. When the AFDI controller isolates and identifies the faults, it informs the supervisor. Family of PFTC: it consists of a family of passive fault tolerant controllers designed to be robust against specific set of faults.…”

“…FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and .…”

“…The design of the AFDI is also not detailed in the following section. The reader is referred to the corresponding literatures as for instances paper and . We focus in Section 5 on the PFTC design method.…”

“…As the results, our AFTC technique reduces the delay period, when the system is controlled by irrelevant controller, by the help of AFDI block. The readers are referred to and for more details on AFDI controller design.…”

A Fault-Tolerant Control Architecture for Different Battery Topologies in Electrified Vehicles

“…The suggested detection method belongs to the category of active fault detection schemes and is similar to what is proposed in Gholami et al (2011b). In general fault detection is divided into passive or active methods.…”

Active fault tolerant control of piecewise affine systems with reference tracking and input constraints

“…The AFTC procedure is as follows: Normal control law: when no fault in the system is detected, the supervisor selects this control law in the closed‐loop system to satisfy the control objectives. FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and . AFDI controller: once, after the supervisor receives a message from FD block denoting an abnormal behavior of the system, the supervisor selects the active fault diagnosis control law in order to isolate and identify the current faults in the system. When the AFDI controller isolates and identifies the faults, it informs the supervisor. Family of PFTC: it consists of a family of passive fault tolerant controllers designed to be robust against specific set of faults.…”

“…FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and .…”

“…The design of the AFDI is also not detailed in the following section. The reader is referred to the corresponding literatures as for instances paper and . We focus in Section 5 on the PFTC design method.…”

“…As the results, our AFTC technique reduces the delay period, when the system is controlled by irrelevant controller, by the help of AFDI block. The readers are referred to and for more details on AFDI controller design.…”

A Fault-Tolerant Control Architecture for Different Battery Topologies in Electrified Vehicles

“…The suggested detection method belongs to the category of active fault detection schemes and is similar to what is proposed in Gholami et al (2011b). In general fault detection is divided into passive or active methods.…”

Active fault tolerant control of piecewise affine systems with reference tracking and input constraints

“…The AFTC procedure is as follows: Normal control law: when no fault in the system is detected, the supervisor selects this control law in the closed‐loop system to satisfy the control objectives. FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and . AFDI controller: once, after the supervisor receives a message from FD block denoting an abnormal behavior of the system, the supervisor selects the active fault diagnosis control law in order to isolate and identify the current faults in the system. When the AFDI controller isolates and identifies the faults, it informs the supervisor. Family of PFTC: it consists of a family of passive fault tolerant controllers designed to be robust against specific set of faults.…”

“…FD block: the fault diagnosis (FD) block is an observer, which estimates the output of the system at every sample instant in order to detect an abnormal behavior of the system and inform the supervisor. For the details of the fault diagnoser, the readers are referred to observer design section of the following papers: and .…”

“…The design of the AFDI is also not detailed in the following section. The reader is referred to the corresponding literatures as for instances paper and . We focus in Section 5 on the PFTC design method.…”

“…As the results, our AFTC technique reduces the delay period, when the system is controlled by irrelevant controller, by the help of AFDI block. The readers are referred to and for more details on AFDI controller design.…”

A Fault-Tolerant Control Architecture for Different Battery Topologies in Electrified Vehicles

“…The suggested detection method belongs to the category of active fault detection schemes and is similar to what is proposed in Gholami et al (2011b). In general fault detection is divided into passive or active methods.…”