Open AccessIN-CYLINDER MASS FLOW ESTIMATION AND MANIFOLD PRESSURE DYNAMICS FOR STATE PREDICTION IN SI ENGINES
Author(s) -
Sławomir Wojnar,
Boris Rohal’-Ilkiv,
Peter Šimončič,
Marek Honek,
Jozef Csambál
Publication year - 2014
Publication title -
acta polytechnica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.207
H-Index - 15
eISSN - 1805-2363
pISSN - 1210-2709
DOI - 10.14311/ap.2014.54.0240
Subject(s) - inlet manifold , spark (programming language) , cylinder , computational fluid dynamics , manifold (fluid mechanics) , flow (mathematics) , ignition system , control theory (sociology) , mechanics , computer science , flow control (data) , engineering , simulation , automotive engineering , mechanical engineering , control (management) , physics , internal combustion engine , aerospace engineering , artificial intelligence , programming language , computer network
The aim of this paper is to present a simple model of the intake manifold dynamics of a spark ignition (SI) engine and its possible application for estimation and control purposes. We focus on pressure dynamics, which may be regarded as the foundation for estimating future states and for designing model predictive control strategies suitable for maintaining the desired air fuel ratio (AFR). The flow rate measured at the inlet of the intake manifold and the in-cylinder flow estimation are considered as parts of the proposed model. In-cylinder flow estimation is crucial for engine control, where an accurate amount of aspired air forms the basis for computing the manipulated variables. The solutions presented here are based on the mean value engine model (MVEM) approach, using the speed-density method. The proposed in-cylinder flow estimation method is compared to measured values in an experimental setting, while one-step-ahead prediction is illustrated using simulation results.