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Different Strategies for Transient Control of the Air-Fuel Ratio in a SI Engine
Blomqvist, Daniel, Byttner, Stefan, Rögnvaldsson, Thorsteinn, Holmberg, Ulf
This paper compares several strategies for air-fuel ratio tran-sient control. The strategies are: A factory-standard look-up table based system (a SAAB Trionic 5), a feedback PI controller with and without feed-forward throttle correction, a linear feed-forward control algorithm, and two nonlinear feed- forward algorithms based on artificial neural networks. The control strategies have been implemented and evaluated in a SAAB 9000 car during a transient driving test, consisting of an acceleration in the second gear from an engine speed of 1500 rpm to 3000 rpm. The best strategies are found to be the neural network based ones, followed by the table based factory system. The two feedback PI controllers offer the poorest performance.
Nyckelord: Transient Control; SI Engine