Synchronization of Combustion Variations in a Multicylinder Spark Ignition Engine

Abstract

We report experimental observations of synchronization among combustion variations in different cylinders at fuel-lean conditions in an eight-cylinder spark ignition engine. Our results appear to confirm that synchronization readily occurs and that it becomes stronger as the overall equivalence ratio is reduced from stoichiometric. It also appears that the onset of synchronization is associated with bifurcation instabilities reported previously for combustion in single cylinders. We use both cross-correlation and symbolic time series analysis to quantify the apparent relationships between pairs of cylinders and multicylinder groups. Extension of a simple dynamic model for single-cylinder combustion variations to the multicylinder case appears to agree with the observations and provides a basis for further studies. The occurrence of significant cylinder-to-cylinder synchronization may have significant implications for engine diagnostics and control.

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Document Details

Document Type
Technical Report
Publication Date
Aug 04, 2000
Accession Number
ADA452500

Entities

People

  • C. S. Daw
  • Charles E. Finney
  • Francis T. Connolly
  • Johney B. Green Jr.
  • Robert M. Wagner

Organizations

  • Oak Ridge National Laboratory

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Acquisition
  • Combustion
  • Couplings
  • Cross Correlation
  • Data Acquisition
  • Data Analysis
  • Engineering
  • Engines
  • Frequency
  • Heat Energy
  • Ignition
  • Intake Manifolds
  • Measurement
  • Observation
  • Pressure Measurement
  • Spark Ignition
  • Spark Ignition Engines

Readers

  • Combustion science or combustion engineering.
  • Parallel and Distributed Computing.
  • Petroleum Engineering