Patent ID: 6973910
Filing Date: 2005-12-13
Classification: F02D,F02M

Abstract:
1. A fuel injection control apparatus for an internal combustion engine, wherein the engine has a first fuel injection valve for injecting fuel into a cylinder of the engine, and a second fuel injection valve for injecting fuel into an intake passage connected to the cylinder, the engine is operated in a combustion mode that is selected from at least stratified lean combustion and homogeneous combustion, the apparatus comprising; control means that selects the combustion mode according to the operational state of the engine and controls the fuel injection valves in a fuel injection mode that corresponds to the selected combustion mode, wherein, when the stratified lean combustion is selected, the control means causes the first fuel injection valve to inject fuel during the compression stroke of the engine, and wherein, when the homogeneous combustion is selected, the control means causes the first fuel injection valve to inject fuel during the intake stroke of the engine; misfire detecting means for detecting a misfire in the cylinder; and switching means, wherein, when a misfire is detected by the misfire detecting means while the engine is operated in the stratified lean combustion or the homogeneous combustion, the switching means switches the fuel injection mode such that the ratio of the amount of fuel injected from the second fuel injection valve to the entire amount of fuel supplied into the cylinder is increased.