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The Potential of Using the Ion-Current Signal for Optimizing Engine Stability - Comparisons of Lean and EGR (Stoichiometric) Operation

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Author

Summary, in English

Ion current measurements can give information useful for controlling the combustion stability in a multi-cylinder engine. Operation near the dilution limit (air or EGR) can be achieved and it can be optimized individually for the cylinders, resulting in a system with better engine stability for highly diluted mixtures. This method will also compensate for engine wear, e.g., changes in volumetric efficiency and fuel injector characteristics. Especially in a port-injected engine, changes in fuel injector characteristics can lead to increased emissions and deteriorated engine performance when operating with a closed-loop lambda control system. One problem using the ion-current signal to control engine stability near the lean limit is the weak signal resulting in low signal-to-noise ratio. Measurements presented in this paper were made on a turbocharged 9.6-liter, six-cylinder natural gas engine with port injection. Each cylinder was individually controlled by a cylinder control module (CCM). A high turbulence combustion chamber was used to be able to operate with highly diluted mixtures. Comparisons between lean and EGR (stoichiometric) operation were made to investigate the potential of using the ion-current signal to control engine stability (cylinder-to-cylinder and cycle-to-cycle variations). A much stronger ion-current signal was found with EGR compared to lean operation, for the same load and comparable emissions.

Department/s

Publishing year

2003

Language

English

Publication/Series

SAE Special Publications

Volume

2003

Issue

1749

Document type

Conference paper

Publisher

Society of Automotive Engineers

Topic

  • Energy Engineering

Keywords

  • Spark Ignition
  • Control
  • CNG
  • Natural Gas
  • Ion Current

Conference name

SAE 2003 World Congress and Exhibition

Conference date

2003-03-03 - 2003-03-06

Conference place

Detroit, Michigan, United States

Status

Published

Project

  • Competence Centre for Combustion Processes

ISBN/ISSN/Other

  • ISSN: 0099-5908