Patent ID: 6591818
Filing Date: 2003-07-15
Classification: F01N,F02D,F02M,Y02T

Abstract:
An internal combustion engine having an exhaust gas recirculation passage for recirculating an exhaust gas discharged from a combustion chamber into an engine intake passage, wherein as an amount of a recirculating exhaust gas (EGR) supplied into the combustion chamber is increased, an amount of a soot produced gradually increases and peaks, and as the amount of the EGR supplied into the combustion chamber is further increased, a temperature of a fuel and a surrounding gas upon combustion in the combustion chamber becomes lower than a temperature that allows the soot to be produced, so that substantially no soot is produced, the internal combustion engine comprising:an exhaust gas control catalyst that purifyies the exhaust gas discharged from the combustion chamber; and a controller that, at engine start-up, first causes performance of a second combustion in which the amount of the EGR supplied into the combustion chamber is less than the amount of EGR that peaks the amount of the soot produced, and then causes performance of a first combustion in which the amount of EGR supplied into the combustion chamber is greater than the amount of EGR that peaks the amount of the soot produced, and substantially no soot is produced, wherein when the second combustion is performed at the engine start-up, the controller first curbs an amount of a hydrocarbon supplied to the exhaust gas control catalyst by causing performance of a combustion in which the amount of the hydrocarbon in the exhaust gas does not increase and a temperature of the exhaust gas discharged from the combustion chamber becomes relatively high, and then the controller increases the amount of the hydrocarbon supplied to the exhaust gas control catalyst by causing performance of a combustion in which the amount of the hydrocarbon in the exhaust gas increases and the temperature of the exhaust gas discharged from the combustion chamber becomes relatively high.