Multi-stage combustion engine

Abstract From the Canadian patent

A method of operating a multiple cylinder internal combustion engine in a fourstroke cycle. A first amount of fuel is introduced into each of the cylinders (10) earlier than 45 degrees before top dead center of a combustion stroke. Air significantly in excess of that providing a stoichiometric amount of oxygen is also introduced into each cylinder to produce a first mixture upon introduction of the fuel, which mixture is ignited to produce a first combustion event. Subsequent to substantial completion of the first combustion event, but prior to top dead center in the same combustion stroke or shortly after top dead center in the expansion stroke a second amount of fuel is , …