Second-order sliding mode strategy for air-fuel ratio control of lean-burn SI engines

Behrouz Ebrahimi, Reza Tafreshi, Javad Mohammadpour, Matthew Franchek, Karolos Grigoriadis, Houshang Masudi

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Higher fuel economy and lower exhaust emissions for spark-ignition engines depend significantly on precise air-fuel ratio (AFR) control. However, the presence of large time-varying delay due to the additional modules integrated with the catalyst in the lean-burn engines is the primary limiting factor in the control of AFR. In this paper, the engine dynamics are rendered into a nonminimum phase system using Padé approximation. A novel systematic approach is presented to design a parameter-varying dynamic sliding manifold to compensate for the instability of the internal dynamics while achieving desired output tracking performance. A second-order sliding mode strategy is developed to control the AFR to remove the effects of time-varying delay, canister purge disturbance, and measurement noise. The chattering-free response of the proposed controller is compared with conventional dynamic sliding mode control. The results of applying the proposed method to the experimental data demonstrate improved closed-loop system responses for various operating conditions.

Original languageEnglish
Article number6612669
Pages (from-to)1374-1384
Number of pages11
JournalIEEE Transactions on Control Systems Technology
Volume22
Issue number4
DOIs
Publication statusPublished - 2014

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Engines
Air
Sliding mode control
Fuel economy
Internal combustion engines
Closed loop systems
Controllers
Catalysts

Keywords

  • Air-fuel ratio (AFR) control
  • dynamic sliding manifold
  • lean-burn engine
  • nonminimum phase system
  • second-order sliding mode
  • time-varying delay

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Cite this

Second-order sliding mode strategy for air-fuel ratio control of lean-burn SI engines. / Ebrahimi, Behrouz; Tafreshi, Reza; Mohammadpour, Javad; Franchek, Matthew; Grigoriadis, Karolos; Masudi, Houshang.

In: IEEE Transactions on Control Systems Technology, Vol. 22, No. 4, 6612669, 2014, p. 1374-1384.

Research output: Contribution to journalArticle

Ebrahimi, Behrouz ; Tafreshi, Reza ; Mohammadpour, Javad ; Franchek, Matthew ; Grigoriadis, Karolos ; Masudi, Houshang. / Second-order sliding mode strategy for air-fuel ratio control of lean-burn SI engines. In: IEEE Transactions on Control Systems Technology. 2014 ; Vol. 22, No. 4. pp. 1374-1384.
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