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This paper designs the diagnosis strategy for OBD system oxygen sensor degradation and the relevant test on engine bench is made by oxygen signal generator. The engine emission influence due to oxygen sensor degradation is analysed. Based on the structure and sensing principle of zirconia type oxygen sensor, the mechanism of oxygen sensor deterioration is analysed, and some proposals are put forward...
The quantitative descriptions of fault responses' characters are the chiefly presupposition of circuit fault analysis and diagnosis. Aimed to solving the deficiency of traditional information entropy theory in characters extraction of the information mutation, an energy based information entropy model is proposed to measure the complexity feature of signals. Firstly, the energy distribution uncertainty...
In equipment monitoring and fault diagnosis, correctly evaluating and selecting the signal features contribute greatly to the effectiveness and accuracy of recognition result. Because it is difficult to create a criterion to evaluate the feature of measured signals in condition of small samples when we use traditional statistic pattern recognition theory to do this, this paper put forward a method...
This study concerns maintenance service technology and maintenance activities in supply chain, and designs a framework of collaborative maintenance service platform (CMSP) based on a whole maintenance service cycle. Previous studies of maintenance service technology are related to the operation of an enterprise-level without considering collaboration in supply chain. This paper point out that CMSP...
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