Model Based Diagnosis of Both Sensor-Faults and Leakage in the Air-Intake System of an SI-Engine
Many model based solutions to diagnosis problems in SI-engines have
been discussed in literature. However most presented methods are
useful only for a specific class of faults. Here a systematic and more
general method is presented. With this method, which is based on a
structure of hypothesis tests, it is possible to diagnose a large
variety of different types of faults. The method is applied to the diagnosis of
sensor-faults and leakage in the air-intake system of an SI-engine.
The features of the method are demonstrated by using experiments on a
real SI-engine. The experiments show that the method is capable to
diagnose both leakage and different types of sensor faults. Both
detection and isolation are considered. It is for example possible to
distinguish between a manifold leak and a manifold pressure sensor
fault.
M. Nyberg
SAE Paper,
1999
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