Patent ID: 8126638
Filing Date: 2012-02-28
Classification: F02D,G01M

Abstract:
1. An engine having a plurality of cylinders wherein a fuel injection valve is provided in each of the cylinders and opening timing of each of the fuel injection valves can be controlled respectively, characterized by having a fuel injection failure detection means comprising: an individual standard rotation speed output means which outputs individual standard rotation speed of each of the cylinders following fuel injection of the corresponding fuel injection valve when all the fuel injection valves are in normal state; an individual actual rotation speed calculation means which calculates individual actual rotation speed of each of the cylinders following the fuel injection of the corresponding fuel injection valve; a temporary judgment means which calculates rotation speed difference of the cylinders based on the individual standard rotation speed and the individual actual rotation speed of each of the cylinders and judges temporarily that at least one of the cylinders causes the fuel injection failure when the rotation speed difference is higher than predetermined value; a difference storage means in which the rotation speed difference of the cylinders is stored; a forced stop means which stops forcedly fuel injection to the cylinders respectively following the temporary judgment; and a contrast arithmetic operation means which operates contrastively the rotation speed difference of each of the cylinders at the time of temporary judgment with rotation speed difference of each of the cylinders at the time of the forced stop of fuel injection to the cylinders respectively, wherein when positive and negative of the rotation speed difference of each of the cylinders at the time of temporary judgment is in agreement with that at the time of the forced stop of fuel injection to one of the cylinders and each rotation speed difference at the time of the forced stop of fuel injection to the certain cylinder is not less than the absolute value of rotation speed difference at the time of the temporary judgment in a fuel injection forced stop pattern of each of the cylinder as the result of the contrast arithmetic operation, the fuel injection failure detection means judges that the cylinder that the fuel injection thereto is stopped forcedly causes the fuel injection failure.