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

doi:10.3182/20121023-3-FR-4025.00007

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 proceeding › Conference contribution

7 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 language	English (US)
Title of host publication	2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012
Publisher	IFAC Secretariat
Pages	296-301
Number of pages	6
Edition	30
ISBN (Print)	9783902823168
DOIs	https://doi.org/10.3182/20121023-3-FR-4025.00007
State	Published - 2012
Event	2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012 - Rueil-Malmaison, France Duration: Oct 23 2012 → Oct 25 2012

Publication series

Name	IFAC Proceedings Volumes (IFAC-PapersOnline)
Number	30
Volume	45
ISSN (Print)	1474-6670

Other

Other	2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012
Country/Territory	France
City	Rueil-Malmaison
Period	10/23/12 → 10/25/12

Keywords

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

ASJC Scopus subject areas

Control and Systems Engineering

Access to Document

10.3182/20121023-3-FR-4025.00007

Cite this

Ebrahimi, B., Tafreshi, R., Masudi, H., Franchek, M. A., Mohammadpour, J., & Grigoriadis, K. (2012). A systematic air-fuel ratio control strategy for lean-burn SI engines. In 2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012 (30 ed., pp. 296-301). (IFAC Proceedings Volumes (IFAC-PapersOnline); Vol. 45, No. 30). IFAC Secretariat. https://doi.org/10.3182/20121023-3-FR-4025.00007

A systematic air-fuel ratio control strategy for lean-burn SI engines. / Ebrahimi, B.; Tafreshi, R.; Masudi, H. et al.
2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012. 30. ed. IFAC Secretariat, 2012. p. 296-301 (IFAC Proceedings Volumes (IFAC-PapersOnline); Vol. 45, No. 30).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ebrahimi, B, Tafreshi, R, Masudi, H, Franchek, MA, Mohammadpour, J & Grigoriadis, K 2012, A systematic air-fuel ratio control strategy for lean-burn SI engines. in 2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012. 30 edn, IFAC Proceedings Volumes (IFAC-PapersOnline), no. 30, vol. 45, IFAC Secretariat, pp. 296-301, 2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012, Rueil-Malmaison, France, 10/23/12. https://doi.org/10.3182/20121023-3-FR-4025.00007

Ebrahimi B, Tafreshi R, Masudi H, Franchek MA, Mohammadpour J, Grigoriadis K. A systematic air-fuel ratio control strategy for lean-burn SI engines. In 2012 IFAC Workshop on Engine and Powertrain Control, Simulation and Modeling, E-COSM 2012. 30 ed. IFAC Secretariat. 2012. p. 296-301. (IFAC Proceedings Volumes (IFAC-PapersOnline); 30). doi: 10.3182/20121023-3-FR-4025.00007

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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 Pad{\'e} 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.",

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AU - Grigoriadis, K.

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N2 - 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.

AB - 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.

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

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Keywords

ASJC Scopus subject areas

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