FUEL INJECTION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To differentiate a rich control pattern after fuel cut control (FC) between a case in which an integrated value of deviation is converged and a case in which it is not converged in a fuel injection control device for performing air-fuel ratio feedback control at least based on the integrated value of deviation updated by the counting of deviation between the output value of an air-fuel ratio sensor on the downstream side of a catalyst and a value equivalent to a theoretical air-fuel ratio. SOLUTION: An air-fuel ratio is controlled to the theoretical air-fuel ratio AFstoich based on the feedback correction amount calculated by PID treatment of the deviation between the output value of the air-fuel ratio sensor on the downstream side of the catalyst and the sensor value equivalent to the theoretical air-fuel ratio AFstoich. The conversion of the integrated value of the deviation is determined. The FC is performed according to the operating conditions of an engine. Post-FC rich control is performed immediately after completing FC. When the integrated value of deviation is determined to be converged (Fig.4A), a reduction in the oxygen storage amount of the catalyst by the post-FC rich control is increased more than a case in which the integrated value of deviation is determined to be not converged (Fig.4B). COPYRIGHT: (C)2008,JPO&INPIT