Air Path Model for Gasoline Engines with Fully Variable Valvetrain Systems Methodology & Tools for Cost-Efficient Calibration

Autoren

Dr.-Ing. Massimo Abrate, Dipl.-Ing. Fabio De Giacomo, Dipl.-Ing. Piergiacomo Traversa, Dr.-Ing. Martin Scheidt, Schaeffler Technologies AG & Co. KG, Herzogenaurach

Zusammenfassung

The Schaeffler UniAir system allows an unprecedented unmatched level of freedom in the engine valve lift control. This high degree of flexibility requires changes in the engine control system. For example, the capability to control different valve lifts in each cylinder and every engine revolution enables th e use of the air path to manage fast torque variations, keeping the spark advance in the optimal position with consequent CO₂ and engine raw emission reduction. To manage the high dynamic response of the air, it is necessary to implement a feed forward model in the engine control software (ECM) able to predict the air and EGR trapped in the cylinders with high precision. This
article shows a flexible physical based air and EGR prediction model combined with a tool for the physical based model calibration to minimize the engine calibration effort.

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