Patent ID: 8573184
Filing Date: 2013-11-05
Classification: F02B,F02D,F02M,F02P,Y02T

Abstract:
1. A control apparatus for an engine provided with a plurality of cylinders, comprising: a unit for calculating a mean value of an angular acceleration with respect to each cylinder; a unit for calculating a dispersion of the angular acceleration with respect to each cylinder; a unit for estimating a torque and an air/fuel ratio, with respect to each cylinder on the basis of the mean value of the angular acceleration and the dispersion of the angular acceleration; and a unit for controlling an intake air amount and/or a fuel injection amount and/or an ignition timing, with respect to each cylinder on the basis of the estimated torque and the estimated air/fuel ratio; wherein the unit for estimating the torque and the air/fuel ratio of each cylinder specifies the cylinder of which the mean value of the angular acceleration is minimum, and judges that the torque of the specified cylinder is smaller than the torque of any other cylinders and that the air/fuel ratio of the specified cylinder is comparable with the air/fuel ratios of all the other cylinders, when the mean value of the angular acceleration of the specified cylinder is not greater than a predetermined value A wherein, when it is judged that the torque of the specified cylinder is smaller than the torques of any other cylinder and the air/fuel ratio of the specified cylinder is comparable with the air/fuel ratios of all the other cylinders, the unit for controlling the intake air amount and/or the fuel injection amount and/or the ignition timing corrects the intake air amount of the specified cylinder to be increased until the mean value of the angular acceleration of the specific cylinder becomes greater than the predetermined value A wherein the unit for estimating the torque and the air/fuel ratio of each cylinder specifies the cylinder of which the dispersion of the angular acceleration is maximum, and judges that the torque of the specified cylinder is comparable with the torques of all the other cylinders and that the air/fuel ratio of the specified cylinder is lean as compared with the air/fuel ratios of all the other cylinders, when the mean value of the angular acceleration of the specified cylinder is greater than the predetermined value A wherein, when it is judged that the torque of the specified cylinder is comparable with the torques of all the other cylinders and that the air/fuel ratio of the specified cylinder is lean, the intake air amount of the specified cylinder is corrected to be decreased until the dispersion of the angular acceleration of the specific cylinder becomes smaller than the predetermined value B