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Transient Control of Combustion Phasing and Lambda in a Six-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 exhaust gas recirculation 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 six-cylinder port injected natural gas engine. Model predictive control was used to control lambda, which was modeled using system identification. Furthermore, a proportional integral regulator combined with a feedforward map for obtaining maximum brake torque timing was applied. The results show that excellent steady-state and transient performance can be achieved. [DOI: 10.1115/1.4000605]

Department/s

Publishing year

2010

Language

English

Publication/Series

Journal of Engineering for Gas Turbines and Power

Volume

132

Issue

9

Document type

Journal article

Publisher

American Society Of Mechanical Engineers (ASME)

Topic

  • Other Mechanical Engineering

Status

Published

Project

  • Competence Centre for Combustion Processes

ISBN/ISSN/Other

  • ISSN: 1528-8919