Cycle-by-cycle combustion variations in spark-ignited engines

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Under constant nominal operating conditions, internal combustion engines can exhibit substantial variation in combustion efficiency from one cycle to the next. Previous researchers have attempted to explain these variations as resulting from stochastic, linear, or chaotic physical processes. Our investigations indicate that cyclic combustion variations can be explained as the result of interactions between a global low-dimensional nonlinearity and small-scale, high-dimensional processes that perturb the nonlinearity. Using this approach, we have proposed a simple model that accurately simulates experimentally observed patterns in cyclic combustion variations. Our model also explains the apparent discrepancies among previous investigators regarding the basic nature of ... continued below

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14 p.

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Daw, C.S.; Finney, C.E.A. & Connolly, F.T. September 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Daw, C.S. Oak Ridge National Lab., TN (United States)
  • Finney, C.E.A. Univ. of Tennessee, Knoxville, TN (United States). College of Engineering
  • Connolly, F.T. Ford Motor Company, Dearborn, MI (United States)

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Description

Under constant nominal operating conditions, internal combustion engines can exhibit substantial variation in combustion efficiency from one cycle to the next. Previous researchers have attempted to explain these variations as resulting from stochastic, linear, or chaotic physical processes. Our investigations indicate that cyclic combustion variations can be explained as the result of interactions between a global low-dimensional nonlinearity and small-scale, high-dimensional processes that perturb the nonlinearity. Using this approach, we have proposed a simple model that accurately simulates experimentally observed patterns in cyclic combustion variations. Our model also explains the apparent discrepancies among previous investigators regarding the basic nature of cyclic variations. Further, it appears that symbol dynamics are useful for characterizing the observed model and experimental behavior.

Physical Description

14 p.

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OSTI as DE97008566

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  • 4. experimental chaos conference, Boca Raton, FL (United States), 6-8 Aug 1997

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  • Other: DE97008566
  • Report No.: CONF-970851--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 522755
  • Archival Resource Key: ark:/67531/metadc693254

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 25, 2016, 12:25 p.m.

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Daw, C.S.; Finney, C.E.A. & Connolly, F.T. Cycle-by-cycle combustion variations in spark-ignited engines, article, September 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc693254/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.