Patent ID: 6293095
Filing Date: 2001-09-25
Classification: F01N,F02B,F02D,Y02T

Abstract:
An in-cylinder injection type internal combustion engine including a fuel injector that injects fuel directly into a combustion chamber, comprising:a catalyst that purifies exhaust gas discharged from the combustion chamber;a fuel injection control device that controls the fuel injected from the fuel injector, said fuel injection control device having a main fuel injection control unit and an additional fuel injection control unit, said main fuel injection control unit driving the fuel injector to inject fuel that is to be subjected to premixed combustion or stratified charge combustion, depending upon operating conditions of the engine, said additional fuel injection control unit driving the fuel injector to inject additional fuel during one of a middle period and after the middle period of an expansion stroke after the fuel injector is driven by said main fuel injection control unit to generate a combustion gas that contains unburned HC when a temperature of said catalyst needs to be increased; andan exhaust manifold provided between the combustion chamber and the catalyst, said exhaust manifold having a manifold inlet connected to an exhaust port of the engine, and a manifold outlet connected to an inlet side of the catalyst, said exhaust manifold forming an exhaust chamber that interferes with the flow of the exhaust gas discharged from the combustion chamber to momentarily maintain the discharged exhaust gas in the exhaust chamber and burn the unburned HC therein to heat the catalyst.