Patent ID: 6240723
Filing Date: 2001-06-05
Classification: F02B,F02D,F02M,Y02T

Abstract:
A compression ignition type engine in which an amount of production of soot gradually increases and then peaks when an amount of inert gas in a combustion chamber increases and in which a further increase of the amount of inert gas in the combustion chamber results in a temperature of fuel and surrounding gas at the time of combustion in the combustion chamber becoming lower than a temperature of production of soot and therefore almost no production of soot any longer, said engine comprising:a catalyst arranged in an engine exhaust passage and having an oxidation function and;switching means for selectively switching between a first combustion where the amount of the inert gas in the combustion chamber is larger than the amount of inert gas where the amount of production of soot peaks and almost no soot is produced and a second combustion where the amount of inert gas in the combustion chamber is smaller than the amount of inert gas where the amount of production of soot peaks, said switching means initially performing the second combustion when the engine operation is started and then switching to the first combustion.