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Simple Models for Cyclic Variations Spark Ignition Engines

[+] Author Affiliations
T. K. Chandrashekar


A. J. Antony

St. Joseph College of Engineering

Paper No. IMECE2005-79678, pp. 185-193; 9 pages
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Energy Conversion and Resources
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Power Division
  • ISBN: 0-7918-4218-5 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME


Cycle to Cycle variations in SI engines have increased our attention as reducing these CBC fluctuations will lead to better drivability, increased power output, better fuel economy, reduced emissions. As auto industry is growing at an alarming rate, numbers of users of automobiles are increasing day by day & strict emission standards have led people to think about the ways of increasing power with the same input. In this aspect evaluating the reasons for CBC variations has become the urgent need. In the present work a C-program has been written to simulate the same and pressure crank angle diagrams and MFB-crank angle diagrams for three different models & three different burn rates. The results are plotted & analyzed so that the best operating conditions are developed. The effects of Equivalence ratio, speed, throttle etc are studied.

Copyright © 2005 by ASME



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