CPC F01N 3/2033 (2013.01) [F01N 3/021 (2013.01); F01N 3/0814 (2013.01); F01N 3/2066 (2013.01); F01N 11/005 (2013.01); F01N 13/009 (2014.06); F02D 41/0087 (2013.01); F02D 41/401 (2013.01); F01N 2430/08 (2013.01); F01N 2900/08 (2013.01); F01N 2900/1404 (2013.01); F01N 2900/1602 (2013.01); F02D 2041/0012 (2013.01); F02D 2200/0802 (2013.01); F02D 2200/0804 (2013.01); Y02T 10/12 (2013.01); Y02T 10/40 (2013.01)] | 20 Claims |
1. An engine controller configured to operate a variable displacement internal combustion engine by:
defining a firing pattern and a pumping pattern for maintaining an air-fuel ratio for one or more cylinders of the variable displacement internal combustion engine within a predefined range between 20 and 35 during a transition from a first firing density to a second firing density; and
implementing the defined firing pattern and the defined pumping pattern so that the air-fuel ratio for the one or more cylinders is maintained within the predefined range between 20 and 35 during the transition from the first firing density to the second firing density.
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