Dynamic Model Based Diagnosis for Combustion Engines in RODON
Diagnosis is the task of finding faults or malfunctioning components in a
technical system, e.g a car. When doing diagnosis on cars with combustion
engines, a computer program can be used. The computer program, also
called diagnosis system, needs information about the car. This information
could be data sheets of all the electronic components in the car. It could also
be a description of how the engine behaves in a nominal and a non-nominal
case. This information is contained in a model of the engine. RODON, a diagnostic
tool developed by S¨orman Information and Media AB, uses models
of systems for conflict detection diagnosis. RODON needs fault models of the
components to do diagnosis. The diagnosis system is then used in workshops,
factories, or other places where cars need to be surveyed.
In this thesis, a Simulink model of the nominal behaviour of a combustion
engine is given. The problem is how to make use of the model as well as the
diagnostic tool RODON for combustion engine diagnosis. To solve this, the
Simulink model is translated into a RODON model. Translating a Simulink
model into a RODON model requires a new library in RODON. The library
developed in this thesis is called AdvancedBlocks library.
The Simulink model describes the nominal behaviour of a combustion engine
but for diagnosis with RODON, fault models are needed as well. Several
types of faults that can occur in an engine have been studied and fault models
have been implemented in RODON. The conclusion is that diagnosis in
RODON with a translated engine model is possible.
Joella Lundkvist and Stina Wahnström
2007
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