0
Research Papers

Modeling of Air-Fuel Ratio Dynamics of Gasoline Combustion Engine With ARX Network

[+] Author and Article Information
Tomáš Polóni1

Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, 812 31 Bratislava, Slovakiatomas.poloni@stuba.sk

Tor Arne Johansen

Department of Engineering Cybernetics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway

Boris Rohaľ-Ilkiv

Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, 812 31 Bratislava, Slovakia

1

Corresponding author.

J. Dyn. Sys., Meas., Control 130(6), 061009 (Sep 25, 2008) (10 pages) doi:10.1115/1.2963049 History: Received October 30, 2006; Revised May 19, 2008; Published September 25, 2008

This article deals with nonlinear modeling of air-fuel ratio (AFR) dynamics of gasoline engines during transient operation. With a collection of input-output data measured near several operating points of the commercial engine, we have identified a global model of the system. The global model structure comes out of the modeling principles based on a weighting of local linear ARX model parameters in dependency on the operating point. It was found that the studied global model has the ability to approximate nonlinear effects and varying response time as well as varying time delay of air-fuel ratio dynamics. The advantage of the local linear approach is that it is flexible to fit experimental data and provides an appropriate structure for advanced nonlinear control algorithm synthesis. Moreover, the proposed nonlinear AFR model with identified numeric values of parameters listed in this article can be used for simulation purposes and also for testing of control algorithms.

FIGURES IN THIS ARTICLE
<>
Copyright © 2008 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Weighted ARX local model network structure

Grahic Jump Location
Figure 2

Engine setup with input/output relations; dashed arrows, inputs; solid arrows, outputs

Grahic Jump Location
Figure 3

Identification scheme of LLM

Grahic Jump Location
Figure 4

Validation of ARX local model in the OP1; the air-path

Grahic Jump Location
Figure 5

Validation of ARX local model in the OP1; the fuel-path

Grahic Jump Location
Figure 6

The results of air-path identification

Grahic Jump Location
Figure 7

The results of fuel-path identification

Grahic Jump Location
Figure 8

Weighting functions used in the global AFR model; the air-path

Grahic Jump Location
Figure 9

Weighting functions used in the global AFR model; the fuel-path

Grahic Jump Location
Figure 10

Spectral density plot of the PRBS signals

Grahic Jump Location
Figure 11

Air-path validation of the global AFR model in the operating points (OP) 1–9

Grahic Jump Location
Figure 12

Fuel-path validation of the global AFR model in the OP 1–9

Grahic Jump Location
Figure 13

Air-path simulation with the constant throttle steps

Grahic Jump Location
Figure 14

Fuel-path simulation with the fuel pulse width modulation

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In