TRANSIENT SYSTEM OPTIMIZATION OF AN EXPERIMENTAL ENGINE CONTROL SYSTEM OVER THE FEDERAL EMISSIONS DRIVING SCHEDULE

Transient System Optimization (TSO) is an iterative procedure which uses data measured during the actual federal fuel economy and emission tests, rather than a mathematical mode. The optimal control theory specifies a new improved control vector (A/F, SA, EGR, etc. ) for every half second throughout the tests. The improved control vector is correlated with the feedback control variables (e. g. , engine speed, load, temperature, etc. ) to form the improved feedback control functions. These new feedback control functions are employed during the next fuel economy and emission tests for the subsequent iteration. Unlike previous techniques, TSO deals with the engine-vehicle system during transient operation, formally including a driveability control constraint the cold-start portion of the emissions test, and the catalytic converter transient emission signature. The TSO procedure has been applied successfully to an experimental engine control structure operated over the federal cold-start emissions test. The driveability control constraint function defined in this paper was measured in real time during transient experiments. Evaluating this driveability function employing the optimal air-fuel ratio and spark advance control laws has shown the necessity of imposing driveability limits during the optimization.

  • Supplemental Notes:
    • This paper was precsented at the SAE Meeting, Febuary 27-March 3, 1978.
  • Corporate Authors:

    Society of Automotive Engineers

    400 Commonwealth Drive
    Warrendale, PA  USA  15096
  • Authors:
    • Dohner, A R
  • Publication Date: 1978-3

Media Info

  • Features: References;
  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00178114
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 780286 Preprint
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM