Patent ID: 6131388
Filing Date: 2000-10-17
Classification: F02B,F02D,Y02T

Abstract:
A compression ignition type engine in which an amount of production of soot gradually increases and then peaks when an amount of recirculated exhaust gas supplied in a combustion chamber increases and in which a further increase of the amount of recirculated exhaust gas supplied in the combustion chamber results in a temperature of fuel and surrounding gas 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:switching means for selectively switching between a first combustion where the amount of the recirculated exhaust gas supplied to the combustion chamber is larger than the amount of recirculated exhaust gas where the amount of production of soot peaks and almost no soot is produced and a second combustion where the amount of recirculated exhaust gas supplied to the combustion chamber is smaller than the amount of recirculated exhaust gas where the amount of production of soot peaks and;judging means for judging one of if the temperature of burned gas in the combustion chamber should be raised and if the amounts of unburned HC and CO exhausted from the combustion chamber should be increased, said switching means switching from said second combustion to said first combustion when it is judged by said judging means that one of the temperature of burned gas in the combustion chamber should be raised or the amounts of unburned HC and CO exhausted from the combustion chamber should be increased when the second combustion is being performed.