To learn and correct the displacement of injection characteristics of two fuel injection valves of each cylinder, in an internal combustion engine having two fuel injection valves on the intake side of each cylinder.
While an air-fuel ratio F/B control is performed by injecting both of two fuel injection valves 21 of each cylinder for each fuel injection timing of the cylinder, the displacements (total displacements of injection characteristics) of the injection characteristics of all the fuel injection valves 21 of an engine 11 are learned, based on the corrected amount of the air-fuel ratio F/B. Then, a control to inject a fuel of an injection amount requested by the cylinder to be learned by only one fuel injection valve 21 with the injection of the other fuel injection valve 21 stopped, is performed on only either cylinder (cylinder to be learned) while the air-fuel ratio F/B control is performed while alternately switching between the cylinder to be learned and the injection-stopped fuel injection valve 21. Based on the variation amount of the correction amounts of the air-fuel ratio F/B obtained before and after the stop of the injection of each fuel injection valve 21, the displacement of the injection characteristics of each fuel injection valve 21 of the cylinder to be learned (displacement of individual injection characteristics) is learned individually.
COPYRIGHT: (C)2010,JPO&INPIT
Sugiyama Koichi
Yoshinori Yamashita
Hidekazu Omura
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