Air-fuel ratio (AFR) control is important for the exhaust emission reduction while using the\nthree-way catalytic converter in the spark ignition (SI) engine. However, the transient cylinder air\nmass is unable to acquire by sensors directly and it may limit the accuracy of AFR control. The complex\nengine dynamics and working conditions make the intake air estimation a challenge work. In this\npaper, a novelty design of intake air observer is investigated for the port-injected SI engine. The intake\nair dynamical modeling and the parameter fitting have been carried out in detail. Extended Kalman\nFilter (EKF) has been used to optimize the instantaneous cylinder charge estimation and minimize\nthe effort of pump gas fluctuation, random noise, and measurement noise. The experiment validation\nhas been conducted to verify the effectiveness of the proposed method.
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