A Layered Model Based Diagnosis: Application to a Gear Box System

A two layers diagnosis system is proposed for a passenger car gearbox system. Conventional physical constraints based diagnosis is placed on the first layer. Model based diagnosis and specific symptom diagnosis are built on the second layer. Diagnosis rules for the first layer are described in a tabular form, then an algorithm is described with a symbolic coding tool. The residual method was selected for the model based diagnosis. The proposed strategy was implemented into time domain simulation to evaluate accuracy of the FDI system. A simulation study illustrates the proposed diagnosis process and shows effectiveness of the method