MULTIPLE ARX MODEL-BASED AIR-FUEL RATIO PREDICTIVE CONTROL FOR SI ENGINES

Abstract

In this article, predictive control is suggested to control the injection fuel pulse width in such a manner that the air-fuel ratio deviates as little as possible from the stoichiometric ratio during the transients of an SI engine. The applied control strategy is based on the knowledge of an internal model of the air-path, predicting the change of the air flow through cylinders, and consequently, setting the prediction profile of the desired values of the objective function. The second modeled subsystem, the fuel-path, is an explicit component of the objective function where the amount of the fuel is a function of the control action. It was demonstrated by simulation that multiple model predictive control has the potential to be appropriate mixture control strategy. Thus with further research in the predictive control of air-fuel ratio, cleaner exhausts may be expected.