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The focus of this paper is to apply the fault detection and isolation (FDI) method based on the bond graph (BG) to the electric scooter system. The FDI approach utilizes the concept of analytical redundancy relations (ARRs), which are derived from a BG model with a specific causal relationship. This method is suitable for a variety of types of faults. Simulation in MATLAB/Simulink is conducted to...
In this article, a fault diagnosis method is proposed for induction motor which suffers from stator winding shorted turn fault. During fault detection, rms values of the three phase currents are calculated and two currents are subtracted from each other to form the residuals. After the fault is detected through evaluating the developed residuals, a harmony search algorithm is adopted to estimate the...
This paper proposes an adaptive data fusion algorithm for a multi-rate sensor system based on incomplete measurement. The algorithm has built a method of sensor subsystem fault detection. The subsystem failure is detected and the incomplete measurement is confirmed to avoid contaminating the entire system due to the single failure. The algorithm has built the subsystem switch control and it also introduced...
This article studies fault detection and isolation (FDI) and fault estimation in complex hybrid systems. The FDI approach is based on a set of unified constraints, called augmented Global Analytical Redundancy Relations (AGARRs), to detect and isolate the faults. In order to estimate the magnitude of the fault parameter in the fault candidates, a differential evolution (DE) method is employed. This...
A hybrid system is a complex system which consists of continuous and discrete dynamics, and it displays discrete behaviors, in addition to continuous behaviors. Due to mode changes in a hybrid system, the employment of constant threshold will cause false alarm or missed detection. The cause is that mode changes lead to different composition of component uncertainties. In this paper, in view of component...
This work considers incipient fault diagnosis and prognosis for hybrid systems with unknown mode changes. A set of augmented analytical redundancy relations (ARRs), termed AARRs, is proposed to extend the capability of ARRs to identify degradation of components which are not represented by physical parameters. The methods utilize the unified constraint relations, named global AARRs (GAARRs), for health...
A new ultra high-speed protection scheme is proposed in this paper. Using wavelet transform with multiresolution analysis, the current signals is decomposed into a series of detailed wavelet components. The spectral energies of the wavelet components are calculated and then employed to detect the faults. Characteristics of the proposed ultra high-speed protection algorithm are analyzed and results...
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