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.
Senast uppdaterad: 2016-12-22