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混杂系统故障诊断的关键在于系统模型的建立及状态的估计。利用粒子滤波在混杂系统状态估计上的优势和键合图易于系统建模的特点,提出了一种基于粒子滤波和键合图理论的混杂系统故障诊断方法。首先把系统用键合图语言描述,进而得出系统的状态方程。然后利用粒子滤波算法,同时估计系统的离散和连续状态,当残差超过阈值时,认为系统发生故障。最后在三容水箱传感器故障诊断中验证了该方法的有效性。
The key to fault diagnosis of hybrid system lies in the establishment of system model and the estimation of state. Using the advantages of particle filter in the state estimation of hybrid systems and the characteristics of bond diagrams easy to system modeling, a hybrid system fault diagnosis method based on particle filter and bond graph theory is proposed. First, the system is described by the bond graph language, and then the state equation of the system is obtained. Then the particle filter algorithm is used to estimate the discrete and continuous states of the system simultaneously. When the residual exceeds the threshold, the system is considered to be faulty. Finally, the validity of this method is verified in the fault diagnosis of tank sensor.