A systematic air-fuel ratio control strategy for lean-burn SI engines

B. Ebrahimi, R. Tafreshi, H. Masudi, M. A. Franchek, J. Mohammadpour, K. Grigoriadis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

In this paper, we present a new synthesis method to control air-fuel ratio (AFR) in lean-burn spark ignition engines to maximize the fuel economy. The major challenge in the control of AFR for lean-burn engines is the large time-varying delay in the control loop which restricts the application of conventional control techniques. Time-varying delay in the system dynamics is first approximated by the Padé approximation which renders the system dynamics into non-minimum phase characteristics. Application of dynamic compensators is invoked to retrieve unstable internal dynamics. The associated error dynamics is utilized to construct a PID controller combined with a dynamic compensator to track the desired AFR command using the feedback from the universal exhaust gas oxygen (UEGO) sensor. The proposed method is shown to achieve desired dynamic properties independent of the matched and unmatched disturbances. Results of applying the proposed method to experimental data demonstrate the closed-loop system stability and performance against time-varying delay, canister purge disturbances and measurement noise.

Original languageEnglish (US)
Title of host publication2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012
PublisherIFAC Secretariat
Pages296-301
Number of pages6
Edition30
ISBN (Print)9783902823168
DOIs
StatePublished - 2012
Event2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012 - Rueil-Malmaison, France
Duration: Oct 23 2012Oct 25 2012

Publication series

NameIFAC Proceedings Volumes (IFAC-PapersOnline)
Number30
Volume45
ISSN (Print)1474-6670

Other

Other2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012
CountryFrance
CityRueil-Malmaison
Period10/23/1210/25/12

Keywords

  • AFR control
  • Dynamic compensator
  • Non-minimum phase system
  • Spark ignition engine
  • Time-varying delay

ASJC Scopus subject areas

  • Control and Systems Engineering

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