| 摘要 |
The invention is a combustion method for operation of a multiple cylinder internal combustion engine in a cycle including intake, compression, expansion and exhaust strokes. A first amount of fuel is introduced into each of the cylinders with introduction initiated earlier than 45 DEG before top dead center of a combustion stroke. An amount of air significantly in excess of that providing a stoichiometric amount of oxygen, typically 2-3 times stoichiometry, is also introduced into each of the cylinders 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 compression stroke (or shortly after top dead center in the expansion stroke), a second amount of fuel is introduced into each of the cylinders without introduction of additional air. The second amount of fuel, products of combustion from the first combustion event and oxygen-depleted air form a second mixture which is ignited to produce a second combustion event. Utilizing two (or more) distinct combustion events in each "combustion cycle" significantly reduces the formation of NOx. |
