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Abstract



Model-based Air and Fuel Path Control of a VCR Engine


The objective of the work was to develop a basic control system for an advanced experimental engine from scratch. The engine this work revolves around is a Saab variable compression engine. A new control system is developed based on the naked engine, stripped of the original control system. Experiments form the basis that the control system is built upon. Controllers for throttles, intake manifold pressure for pressures less than ambient pressure and exhaust gas oxygen ratio are developed and validated. They were found to be satisfactory. The lambda controller is tested with several parameter sets, and the best set is picked to be implemented in the engine. Models necessary for the development and validation of the controllers are developed. These models include models for the volumetric efficiency, the pressure dynamics of the intake manifold, the fuel injectors and wall wetting.

Tobias Lindell

2009

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