Patent ID: 8515649
Filing Date: 2013-08-20
Classification: F02D,F02M

Abstract:
1. A fuel injection device for an internal combustion engine comprising: a port injector for injecting fuel into an intake port of the internal combustion engine; a cylinder injector for directly injecting fuel into a cylinder of the internal combustion engine; fuel injection quantity calculating means for calculating, for each cycle, a fuel injection quantity required for achieving a target air-fuel ratio; fuel injection share ratio setting means for setting, for each cycle, an injection share ratio of fuel to be shared between the port injector and the cylinder injector; parameter acquiring means for acquiring a predetermined parameter associated with a temperature of the internal combustion engine; a model for associating a ratio of non-contributing fuel, of fuel injected during one cycle, not contributing to combustion with a predetermined parameter associated with the temperature of the internal combustion engine and the injection share ratio of fuel to be shared between the port injector and the cylinder injector; and non-contributing fuel quantity calculating means for calculating a quantity of the non-contributing fuel by using the calculated fuel injection quantity and the ratio of non-contributing fuel which is calculated by applying the set injection share ratio and the acquired predetermined parameter to the model.