Patent ID: 9309817
Filing Date: 2016-04-12
CPC Classification: F01N,F02D

Claim Text:
1. An internal combustion engine fuel cut control device for an internal combustion engine including a plurality of cylinders, wherein the internal combustion engine fuel cut control device performs the following: performing a first operation and/or a second operation, wherein the first operation is to cut off fuel supply to part of the cylinders, and the second operation is to cut off fuel supply to all of the cylinders; when performing both the first and second operations, performing the first operation in response to satisfaction of a predetermined fuel cut condition, and performing the second operation in response to a lapse of a first predetermined time period after the first operation; when performing the first operation, performing a third operation and a fourth operation in response to satisfaction of a first predetermined fuel cut recovery condition during the first operation, wherein the third operation is to restart fuel supply to the part of the cylinders, and the fourth operation is to control exhaust gas to a first air fuel ratio richer than a theoretical air fuel ratio by an increased amount of fuel supply during a second predetermined time period after the third operation; when performing the second operation, performing a fifth operation and a sixth operation in response to satisfaction of a second predetermined fuel cut recovery condition during the second operation, wherein the fifth operation is to restart fuel supply to all of the cylinders, and the sixth operation is to control exhaust gas to a second air fuel ratio richer than the theoretical air fuel ratio by an increased amount of fuel supply during a third predetermined time period after the fifth operation; and setting the first air fuel ratio higher in degree of being rich than the second air fuel ratio.