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Transient Control of Combustion Phasing and Lambda in a 6-Cylinder Port-Injected Natural-gas Engine

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Author

  • Mehrzad Kaiadi
  • Magnus Lewander
  • Patrick Borgqvist
  • Per Tunestål
  • Bengt Johansson

Summary, in English

Fuel economy and emissions are the two central parameters in heavy duty engines. 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 keeps the regulated emissions at very low levels. The Lambda window which results in very low emissions is very narrow. This issue is more complex with transient operation resulting in losing brake efficiency and also catalyst converting efficiency.



This paper presents different control strategies to maximize the reliability for maintaining efficiency and emissions levels under transient conditions. Different

controllers are developed and tested successfully on a heavy duty 6-cylinder port injected natural gas engine. Model Predictive Control (MPC) was used to control lambda which was modeled using System Identification. Furthermore, a Proportional Integral (PI) regulator combined with a feedforward map for obtaining Maximum Brake Torque (MBT) timing was applied. The results show that excellent steady-state and transient performance can be achieved.

Department/s

Publishing year

2009

Language

English

Pages

655-662

Publication/Series

Proceedings of the Internal Combustion Engine Division 2009 Spring Technical Conference

Document type

Conference paper

Publisher

American Society Of Mechanical Engineers (ASME)

Topic

  • Energy Engineering

Keywords

  • Internal Combustion Engine
  • Natural Gas
  • Control
  • Transient

Conference name

Internal Combustion Engine Division 2009 Spring Technical Conference

Conference date

2009-05-03

Status

Published

Project

  • Competence Centre for Combustion Processes

ISBN/ISSN/Other

  • ISBN: 978-0-7918-4340-6