Patent ID: 8381708
Filing Date: 2013-02-26
Classification: F02D,G01M

Abstract:
1. A vehicle comprising: an internal combustion engine having a plurality of cylinders; an exhaust gas purification catalyst which is arranged in an exhaust passage of the internal combustion engine and purifies exhaust gas; a first air-fuel ratio detecting portion that is arranged upstream of the exhaust gas purification catalyst; a second air-fuel ratio detecting portion that is arranged downstream of the exhaust gas purification catalyst; and a control apparatus of the internal combustion engine, wherein the control apparatus executes main feedback control that controls an air-fuel ratio of the internal combustion engine based on a detection value of the first air-fuel ratio detecting portion, and sub-feedback control that calculates a learning value for correcting the main feedback control based on a detection value of the second air-fuel ratio detecting portion; and wherein the controlling apparatus includes a rotational variation calculating portion that calculates a rotational variation of an output shaft of the internal combustion engine based on combustion of each of the cylinders, a variation integrating portion that calculates a cumulative value of the rotational variation by adding the rotational variation calculated by the rotational variation calculating portion to the rotational variation integrated thus far, an integration counting portion that counts the number of times the rotational variation has been integrated by the variation integrating portion, a combustion state estimating portion that estimates a combustion state of the internal combustion engine according to the cumulative value of the rotational variation integrated by the variation integrating portion, on the condition that the number of integrations counted by the integration counting portion has reached a predetermined value; and a learning value correcting portion that corrects the learning value of the sub-feedback control according to the combustion state estimated by the combustion state estimating portion.