| 摘要 |
PURPOSE:To reduce NOX and HC in the exhaust gas in such a way that one injection port of a multiple-injection port nozzle is directed to the axial line of an auxiliary communicating port, fuel jetted in an eddy-current chamber is diffused, and at the initial stage of combustion, rarefied combustion gas is jetted through a main communicating port into a main combustion chamber. CONSTITUTION:Spray jetted through two auxiliary inspection ports 13, 14 to the plane Y among fuel spray jetted through a three-injection port nozzle 11 into an eddy-current chamber 7 is diffused on both sides in the eddy-current chamber 7, and most of the spray which has been jetted through a main injection port 12 toward an auxiliary communicating port 6 comes into a main combustion chamber 4 within a cycle for ignition lag. In consequence, the inside of the eddy-current chamber 7 becomes a fuel rarefying zone 15 in which there is more air rate than fuel, and its both sides become fuel super- condensed zone 16. Subsequently, fuel in the main combustion chamber 4 and in the eddy-current chamber 7 is ignited, and initial combustion starts. As a piston 2 is coming down, combustion gas in the rarefying zone 15 comes through a main communicating port 5 into the combustion chamber 4. Since the gas is involved in high temperature, it makes combustion in the main combustion chamber 4 favorable, and can reduce NOX and HC in the exhaust gas. |
