Sensor Selection for Observer Feedback in Turbocharged Spark Ignited Engines
Abstract: Precise air/fuel control is necessary for low emissions in
turbocharged (TC) SI-engines. Observers are often proposed for
accurate cylinder air charge estimation in air/fuel controllers. First
it is shown using a structural method that the system is locally
structurally observable using observer-feedback from any measured
state. A systematic method to select observer feedback signals is
important as the number of possible sensor combinations reach 680 when
3 sensors are used which could be placed at 17 different
locations. Here a systematic method based on observability index is
proposed that is able to point out one combination of measured signals
as good candidates to observe the states needed for CAC
estimation. Finally the results are valid for all TC SI-engines with
the same structure but the method is generally applicable.
Per Andersson, Erik Frisk and Lars Eriksson
IFAC World Congress,
2005
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