Intake Air Mass Observer Design Based on Extended Kalman Filter for Air-Fuel Ratio Control on SI Engine

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.

Design and Control of a Shape Memory Alloy-Based Idle Air Control Actuator for a Mid-Size Passenger Vehicle Application

“…The dynamic characteristics of air through the bypass and their corresponding engine idling characteristics are expressed in Equations ( 10)- (13). The main inputs of the equations forming the algorithms in this section include the actual parameters for the spark ignition engine from previous research with experiments [44][45][46] and practical engines [47,48]. The triggering signal from the SMA-based IAC actuator is the opening and closing strokes that vary with time (𝑆).…”

Optimal Sensor Placement for High Pressure and Low Pressure EGR Estimation

“…Their model was validated both with dynamic and stationary measurements. Observer-based estimations were also used in [19] for estimation of the intake air mass for a SI engine using an Extended Kalman Filter, or in [20] where the authors also used an EKF applied to a light-duty diesel engine, creating 8 sub-models to estimate the air system states.…”