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This paper presents the design and application of a robust, gain scheduled controller based on a third-order linear parameter-varying (LPV) model of the airpath of the turbocharged diesel engine under investigation. This model-based control design reduces the calibration effort significantly (a major task faced by the automotive industry), while achieving the same performance as the fully calibrated engine controller. It is accomplished by using the intake manifold air pressure as scheduling variable; since this is also a state variable it yields a quasi-LPV model. A second parameter adjusting the gain of the controller is introduced to render it Calibratable while the robustness estimates still hold. It is demonstrated how online tuning of this single parameter optimizes the performance of the LPV model-based airpath controller. Experimental results from the New European Drive Cycle (NEDC) (including the extra-urban part) demonstrate the validity of this approach.
Date of Publication: Jan. 2006