ANALYSIS OF CYCLE-BY-CYCLE VARIATION OF COMBUSTION

An indicator analyzer has been developed capable of statistical analysis from pressure data of each cylinder of a multi-cylinder engine under steady state conditions by an on-line mini-computer. This analyzer is able to acquire engine data under transient conditions as well and to perform interlocutory analyses of any specified combustion cycle utilizing an off-line large computer. Analysis on the causes of cycle-by-cycle variation (cbcv) of combustion has been made and a simple relation has been derived therefrom such that the variance of indicated mean effective pressure may be broken down into three terms such as variances of released heat and change of internal energy and their co-variance. Experiments revealed that the variance of released heat manifests some characteristics related to the fuel supply system, and that of change of internal energy manifests some characteristics related to the heat released pattern in the cylinder, but the interpretation of the physical significance of the co-variance term remains to be solved. This method is found to be a useful one for analysis of the causes of cbcv of combustion and its improvement in actual engines. (TRRL)

  • Availability:
  • Corporate Authors:

    Society of Automotive Engineers of Japan

    10-2 Goban-cho, Chiyoda-ku
    Tokyo,   Japan 

    Society of Automotive Engineers of Japan

    16-15, 1-chome, Takanawa, Minato-ku
    Tokyo 108,   Japan 
  • Authors:
    • Nohira, H
    • Konomi, T
    • ISHIYAMA, S
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00302959
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jan 30 1980 12:00AM