US 11,053,828 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); and Cummins Inc., Columbus, IN (US)
Filed by Tula Technology, Inc., San Jose, CA (US)
Filed on Sep. 20, 2019, as Appl. No. 16/576,972.
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.
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.
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 62/250,049, filed on Nov. 11, 2015.
Prior Publication US 2020/0025050 A1, Jan. 23, 2020
Int. Cl. 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)] 40 Claims
OG exemplary drawing
 
1. An engine controller in a vehicle for controlling a lean burn internal combustion engine having a plurality of working chambers, each working chamber being configured to operate in a series of working cycles each having an associated firing opportunity, the controller configured to:
direct operation of the internal combustion engine at a first firing density suitable to meet a first torque demand for the internal combustion engine;
determine a target firing density suitable to meet a requested torque demand for the internal combustion engine;
determine an intermediate firing density associated with a transition from the first firing density to the target firing density;
determine a pumping density associated with the transition from the first firing density to the target firing density;
direct operation of the internal combustion engine during the transition by:
selectively firing or not firing each working chamber firing opportunity in accordance with the determined intermediate firing density;
for each working cycle which is not fired, selectively either (a) pumping or (b) not pumping air through the associated working chamber in accordance with the determined pumping density, whereby some of the working cycles that are not fired pump air through the associated working chamber and others of the working cycles that are not fired do not pump air through the associated working chamber during the transition from the first firing density to the target firing density.