Patent ID: 6907861
Filing Date: 2005-06-21
Classification: F02D,Y02T

Abstract:
1. A fuel injection control device of an internal combustion engine, the fuel injection control device comprising: determining means for determining whether a learning condition for performing a learning injection in a specific cylinder of the engine through an injector is established, the learning injection being performed to learn a fuel injection quantity; commanding means for commanding the injector to perform the learning injection in the specific cylinder when the learning condition is established; sensing means for sensing rotation speed of the engine as engine rotation speed; first calculating means for calculating a difference between a variation in the engine rotation speed in the case where the learning injection is performed and a variation in the engine rotation speed in the case where the learning injection is not performed in the specific cylinder as a rotation speed increase; second calculating means for calculating an actual injection quantity of the fuel actually injected from the injector or an actual injection quantity related value related to the actual injection quantity, based on the calculated rotation speed increase; and third calculating means for calculating a difference between the calculated actual injection quantity and a command injection quantity which the injector is commanded to inject or a difference between the calculated actual injection quantity related value and a command injection quantity related value related to the command injection quantity as an injection correction value.