A technique based on Horowitz’s nonlinear quantitative feedback theory is presented, in which the size of the uncertainty is reduced by cancellation of the plant nonlinearity through nonlinear inverse compensation. Linear identification of the open loop nonlinear inverse compensated plant is used to obtain an unstructured uncertainty representation, however, rather than computing QFT templates based on parametric uncertainty. An increase in achievable robust performance with any linear robust performance control design technique may then be obtained. The method is experimentally validated by application to a SISO automotive SI engine idle speed control problem using an electric dynamometer.
Issue Section:
Technical Papers
Keywords:
Engine Control,
Gro¨bner Bases,
Identification,
Idle-Speed,
Inverse Systems,
Lie Derivatives,
Nonlinear,
QFT,
Robust Performance,
State-Elimination,
robust control,
velocity control,
identification,
feedback,
compensation,
linear systems,
nonlinear control systems,
uncertain systems,
control system synthesis,
internal combustion engines
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.Copyright © 2003
by ASME
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