AN APPROACH TO COMBUSTION CONTROL FOR LOW POLLUTION ENGINES BY TWO STAGED COMBUSTION PROCESS

An approach to combustion control for low pollution engines by two staged combustion process. Combustion control in homogeneously charged spark ignition engines was tried by modification of combustion chamber for the purpose of low exhaust emission. Combustion chamber is divided into two compartments by piston crown during some crank angles before and after near tdc. A spark plug located on one of the compartments ignites turbulent homogeneous mixture, then some amount of unburnt mixture in spark chamber and flame blow off to the other one. Combustion rate in the other chamber is variable by the dividing period of the chamber, size of connection hole through two chambers and volume ratio of the two. Test results show that shortening of combustion duration and optimum selection of heat release pattern are possible. In this experiment high rate combustion induced by this system extends lean mixture limit, reduces NOX and CO emissions and cycle to cycle variation of combustion without deterioration of fuel economy, and furthermore improves irregular combustion at light load operation. Thereby this system is particularly effective in lean mixture with heavy EGR operation which is hardly attainable by conventional direct spark ignited engines. /Author/TRRL/

  • Corporate Authors:

    International Federation of Auto Techniques Engs

    3 Avenue du President Wilson
    F 75116 Paris,   France 
  • Authors:
    • Mizunuma, T
    • Sato, T
    • Matsuna, T
  • Publication Date: 0

Media Info

  • Pagination: 1 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00163345
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1978 12:00AM