Closed-Loop Combustion Control Using Ion-Current Signals in a 6-Cylinder Port-Injected Natural-gas Engine

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

High EGR rates combined with turbocharging has been identified as a promising way to increase the maximum load and efficiency of heavy-duty spark ignition engines. With stoichiometric conditions a three-way catalyst can be used which means that regulated emissions can be kept at very low levels. Obtaining reliable spark ignition is difficult however with high pressure and dilution. There will be a limit to the amount of EGR that can be tolerated for each operating point. Open-loop operation based on steady state maps is difficult since there is substantial dynamics both from the turbocharger and from the wall heat interaction. The proposed approach applies standard closed-loop lambda control for controlling the overall air/fuel ratio. Furthermore, ion-current-based dilution limit control is applied on the EGR in order to maximize EGR rate as long as combustion stability is preserved. The proposed control strategy has been successfully tested on a heavy-duty, 6-cylinder, port-injected natural gas engine and our findings show that 1.5-2.5% units (depending on the operating points) improvement in Brake Efficiency can be achieved.

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Subject classification (UKÄ) – MANDATORY

  • Energy Engineering
Original languageEnglish
Title of host publicationSAE technical paper series
Number of pages14
Publication statusPublished - 2008
Publication categoryResearch
Peer-reviewedYes
EventSAE International Powertrains, Fuels and Lubricants Congress - Shanghai, China
Duration: 2008 Jun 23 → …

Conference

ConferenceSAE International Powertrains, Fuels and Lubricants Congress
CountryChina
CityShanghai
Period2008/06/23 → …

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