Abstract
Air-fuel ratio (AFR) control is important for the exhaust emission reduction while using the three-way catalytic converter in the spark ignition (SI) engine. However, the transient cylinder air mass is unable to acquire by sensors directly and it may limit the accuracy of AFR control. The complex engine dynamics and working conditions make the intake air estimation a challenge work. In this paper, a novelty design of intake air observer is investigated for the port-injected SI engine. The intake air dynamical modeling and the parameter fitting have been carried out in detail. Extended Kalman Filter (EKF) has been used to optimize the instantaneous cylinder charge estimation and minimize the effort of pump gas fluctuation, random noise, and measurement noise. The experiment validation has been conducted to verify the effectiveness of the proposed method.
Highlights
The spark ignition (SI) engine emission is reduced by using the three-way catalytic converter (TWC) based on electronic fuel injection control to meet the strict emission requirements
Some the Kalman filters to develop the intake air mass observer have been reported an effective wayair to charge observers have reported in [8,9]measurements on the SI engine and the results showed solve the problem, as itbeen is difficult to obtain in time for experimental the accurate cylinder air mass that input estimation the control performance
The dynamometer was set at a constant load of 40 N·m and the engine speed fluctuated between about
Summary
The spark ignition (SI) engine emission is reduced by using the three-way catalytic converter (TWC) based on electronic fuel injection control to meet the strict emission requirements. Some the Kalman filters to develop the intake air mass observer have been reported an effective wayair to charge observers have reported in [8,9]measurements on the SI engine and the results showed solve the problem, as itbeen is difficult to obtain in time for experimental the accurate cylinder air mass that input estimation the control performance. Althoughtechniques there was could some enhance work about the engine air charge, the complex intake air to develop the intake air mass observer have been reported an effective way to solve the problem, dynamics and accurate AFR control demand still aroused interest for the research of accurate intake as is difficult to obtain measurements in time for the accurate cylinder air mass flow [6,10,11]. The experimental validation invested the effectiveness of the proposed intake air mass observer designofmethod
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