US 11,680,505 B2
Separately determining firing density and pumping density during firing density transitions for a lean-burn internal combustion engine
Shikui Kevin Chen, San Jose, CA (US); Matthew A. Younkins, San Jose, CA (US); and Louis J. Serrano, Los Gatos, CA (US)
Assigned to Tula Technology, Inc., San Jose, CA (US)
Filed by Tula Technology, Inc., San Jose, CA (US)
Filed on Mar. 3, 2022, as Appl. No. 17/686,247.
Application 17/686,247 is a continuation of application No. 17/017,229, filed on Sep. 10, 2020, granted, now 11,300,026.
Application 17/017,229 is a continuation of application No. 16/576,972, filed on Sep. 20, 2019, granted, now 11,053,828, issued on Jul. 6, 2021.
Application 16/576,972 is a continuation in part of application No. 16/373,364, filed on Apr. 2, 2019, granted, now 10,823,029, issued on Nov. 3, 2020.
Application 16/373,364 is a continuation in part of application No. 16/275,881, filed on Feb. 14, 2019, granted, now 10,494,971, issued on Dec. 3, 2019.
Application 16/275,881 is a continuation of application No. 15/347,562, filed on Nov. 9, 2016, granted, now 10,247,072, issued on Apr. 2, 2019.
Claims priority of provisional application 62/254,049, filed on Nov. 11, 2015.
Prior Publication US 2022/0251992 A1, Aug. 11, 2022
Int. Cl. F01N 3/00 (2006.01); F01N 3/20 (2006.01); F02D 41/00 (2006.01); F01N 11/00 (2006.01); F01N 3/021 (2006.01); F02D 41/40 (2006.01); F01N 13/00 (2010.01); F01N 3/08 (2006.01)
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
OG exemplary drawing
 
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.