| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately judge whether or not a scavenging operation has finished in the vicinity of a sensor provided in an exhaust passage. <P>SOLUTION: The electronic control device 50 executes a scavenging operation in the vicinity of the air-fuel ratio sensors 56a, 56b by introducing fresh air to the vicinity of air-fuel ratio sensors 56a, 56b each provided in exhaust passages 21a, 21b during execution of a fuel cut under deceleration of an internal combustion engine 10, and it judges whether or not the scavenging operation has finished in the vicinity of the air-fuel ratio sensors 56a, 56b, respectively. Specifically, it is judged that the scavenging operation has finished in the vicinity of the air-fuel ratio sensors 56a, 56b when the accumulation value of the intake air amount ΣGAr is same as or more than the scavenging operation finish judging value ΣGAt after execution of the fuel cut during deceleration, that is, from stoppage of fuel injection. The scavenging operation finish judging value ΣGAt is set variably according to the scavenging environment in the exhaust passages 21a, 21b. <P>COPYRIGHT: (C)2013,JPO&INPIT |
