Layer-Wise Fault Diagnosis Based on Key Performance Indicator for Cylinder-Piston Assembly of Diesel Engine*

This paper proposes a novel layer-wise fault diagnosis method based on key performance indicator for cylinderpiston assembly of diesel engine. For the purpose of layer-wise fault diagnosis, the wear degree of cylinder-piston assembly is first described with the aid of a series of key performance indicators. Then, fault diagnosis incorporating fault detection and isolation between the assembly layer, the subassembly layer and the underlying monitoring layer is conducted by means of the partial least squares. Finally, an application on cylinderpiston assembly of a two-stroke five-cylinder low-speed marine diesel engine is given in order to demonstrate the effectiveness of the proposed scheme.