Dokument 1.pdf - Universität Siegen

Abstract
With the growing complexity of new control concepts, for example GDI 1 and new strategies
for diesel engines, the number of calibration tasks is steadily increasing. In order to
handle the increasing number of calibration tasks in shorter development times the automatic
calibration procedures are becoming more and more important. The calibration
tasks can be differentiated in static and dynamic procedures. A wide range of experience
already exists in the field of static automatic calibration routines and supportive tools
following the research phase on the market. The research and implementation in the
field of the model-based calibration of dynamic plant behaviour is just in the starting
phase.
The subject of this Ph.D. thesis is the procedure and algorithms of model-based dynamic
calibration. The focus will be on the dynamic calibration procedure and it will
demonstrate the results for the application of the calibration of the dynamic behaviour
of the air and fuel path of an SI 2 -engine.
The following procedure will be used for the model-based dynamic calibration:
1. Plant behaviour must be modeled or dynamic model of the plant exists as a priori
knowledge.
2. Excitation of the dynamic system and identification of the parameters of the dynamic
model with the input/output measurements.
3. Verification of the identified parameters.
A mathematical model description is necessary in order to use the procedure shown
above. The first focus of this work (see chapter two) is to present the model descriptions
based on differential equations for the time continuous and difference equations for the
time discrete case. These cases are discussed for the linear and nonlinear mathematical
descriptions. Furthermore the derived model descriptions are extended to a stochastical
description to take into account the disturbances at the input and the output of the
observed system. The derived mathematical model descriptions are the basis for the
model-based calibration procedures (see chapters five and six).
1 Gasoline Direct Injection
2 Sequential Injection
v