Air-fuel-ratio control of engine system with unknown input observer

Jing Na, Guido Herrmann, Clement Rames, Richard Burke, Chris Brace

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

3 Citations (Scopus)

Abstract

This paper presents an alternative control to maintain the air-fuel-ratio (AFR) of port-injected spark ignition (SI) engines at certain value, i.e. stoichiometric value, to improve the fuel economy. We first reformulate the AFR regulation problem as a tracking control for the injected fuel mass flow rate, which can simplify the control synthesis when the fuel film dynamics are taken into account. The unknown engine parameters and dynamics can be lumped as an unknown signal, and then compensated by incorporating the unknown input observer into the control design. Only the measurable air mass flow rate through throttle, manifold pressure and temperature, and the universal exhaust gas oxygen (UEGO) sensor are utilized. Simulations based on a mean-value engine model (MVEM) illustrate that the proposed control can achieve satisfactory transient and steady-state performance with strong robustness when the engine is operated in varying speed conditions.

LanguageEnglish
Title of host publication2016 UKACC International Conference on Control, UKACC Control 2016
PublisherIEEE
ISBN (Electronic)9781467398916
DOIs
StatusPublished - 7 Nov 2016
Event11th UKACC United Kingdom Automatic Control Council International Conference on Control, UKACC Control 2016 - Belfast, UK United Kingdom
Duration: 31 Aug 20162 Sep 2016

Conference

Conference11th UKACC United Kingdom Automatic Control Council International Conference on Control, UKACC Control 2016
CountryUK United Kingdom
CityBelfast
Period31/08/162/09/16

Keywords

  • Air-to-fuel ratio control
  • Mean-value engine model
  • Spark ignition engine
  • Unknown input observer

ASJC Scopus subject areas

  • Control and Optimization
  • Control and Systems Engineering
  • Energy Engineering and Power Technology

Cite this

Na, J., Herrmann, G., Rames, C., Burke, R., & Brace, C. (2016). Air-fuel-ratio control of engine system with unknown input observer. In 2016 UKACC International Conference on Control, UKACC Control 2016 [7737647] IEEE. https://doi.org/10.1109/CONTROL.2016.7737647

Air-fuel-ratio control of engine system with unknown input observer. / Na, Jing; Herrmann, Guido; Rames, Clement; Burke, Richard; Brace, Chris.

2016 UKACC International Conference on Control, UKACC Control 2016. IEEE, 2016. 7737647.

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

Na, J, Herrmann, G, Rames, C, Burke, R & Brace, C 2016, Air-fuel-ratio control of engine system with unknown input observer. in 2016 UKACC International Conference on Control, UKACC Control 2016., 7737647, IEEE, 11th UKACC United Kingdom Automatic Control Council International Conference on Control, UKACC Control 2016, Belfast, UK United Kingdom, 31/08/16. https://doi.org/10.1109/CONTROL.2016.7737647
Na J, Herrmann G, Rames C, Burke R, Brace C. Air-fuel-ratio control of engine system with unknown input observer. In 2016 UKACC International Conference on Control, UKACC Control 2016. IEEE. 2016. 7737647 https://doi.org/10.1109/CONTROL.2016.7737647
Na, Jing ; Herrmann, Guido ; Rames, Clement ; Burke, Richard ; Brace, Chris. / Air-fuel-ratio control of engine system with unknown input observer. 2016 UKACC International Conference on Control, UKACC Control 2016. IEEE, 2016.
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