Identification and Improvements of an Automotive Diesel Engine Model purposed for Model Based Diagnosis
The objective in this thesis is to improve a previously
developed model for an automotive diesel engine equipped
with EGR and VNT. The engine is the Mercedes-Benz OM611, 2.2
liter four cylinder turbocharged diesel engine. The engine
is fitted in a research car along with a measurement system
and measurements with this system are used both for modeling
and validation.
The valve of the EGR system was changed and
the main task was to make a model for the new valve. But the
performance of an EGR system model is dependent of the
overall performance of the engine model. Therefore the entire engine model will be
considered, attempting to make improvements in different
subsystems. Finally the model of the EGR system will be
added to this. The results show that the final model agree
well with measurement data and it is shown that the main
errors are caused by the models of exhaust manifold and
turbo.
The model is purposed to be used in a model based diagnostics
system. The resulting model is therefore tested in a simple
diagnostics system for intake manifold leakage. The results
show that the model allows for detection of a 4 $mm$
diameter hole in the intake manifold.
Sven Öberg
2001
Page responsible: webmaster
Last updated: 2021-11-10
LiU startsida
