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Model Based Diagnosis of the Air Path of an Automotive Diesel Engine

A model based diagnosis system for the air-path of a turbo-charged diesel engine with EGR is constructed. The faults considered were air-mass flow sensor fault, intake-manifold pressure sensor fault, air-leakage, and the EGR-valve stuck in closed position. A non-linear engine model, with four states, is constructed. The diagnosis system is then constructed in the framework of \emph{structured hypothesis tests}, and by using adaptive observers. The diagnosis system is successfully evaluated in a real car driving on the road.

Mattias Nyberg, Thomas Stutte and Volker Wilhelmi

IFAC Workshop: Advances in Automotive Control, 2001

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