Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Closed-Loop Combustion Control for a 6-Cylinder Port-Injected Natural-gas Engine

In English

Författare

Summary, in Swedish

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 for a heavy duty 6-cylinder port injected natural gas engine. A closed loop load control is also applied for keeping the load at a constant level when using EGR. Furthermore, cylinder pressure based dilution limit control is applied on the EGR in order to keep the coefficient of variation at the desired level of 5%. This way confirms that the EGR ratio is kept at its maximum stable level all times. Pumping losses decrease due to the further opening of the throttle, thereby the gas exchange efficiency improves and since the regulator keeps track of the changes the engine all the time operates in a stable region. Our findings show that excellent steady-state performance can be achieved using closed loop combustion control for keeping the EGR level at the highest level while the stability level is still good enough.

Publiceringsår

2009

Språk

Engelska

Sidor

1232-1241

Publikation/Tidskrift/Serie

SAE International Journal of Fuels and Lubricants

Volym

1

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

SAE

Ämne

  • Energy Engineering

Nyckelord

  • Internal Combustion Engine
  • Natural Gas
  • Control

Conference name

SAE International Powertrains, Fuels and Lubricants Congress

Conference date

2008-06-23

Conference place

Shanghai, China

Status

Published

Projekt

  • Competence Centre for Combustion Processes

ISBN/ISSN/Övrigt

  • ISSN: 1946-3952
  • SAE Technical Paper 2008-01-1722