US 11,685,380 B1
Managing engine firing fraction changes during gear shifts
Louis J. Serrano, Los Gatos, CA (US); Xiaoping Cai, Fremont, CA (US); and Andrew W. Phillips, Rochester, MI (US)
Assigned to Tula Technology, Inc., San Jose, CA (US)
Filed by Tula Technology, Inc., San Jose, CA (US)
Filed on Jan. 14, 2022, as Appl. No. 17/576,160.
Int. Cl. B60W 30/19 (2012.01); F02D 41/02 (2006.01); F02D 41/00 (2006.01); B60W 10/06 (2006.01); B60W 10/11 (2012.01)
CPC B60W 30/19 (2013.01) [B60W 10/06 (2013.01); B60W 10/11 (2013.01); F02D 41/0087 (2013.01); F02D 41/0225 (2013.01); F02D 2200/101 (2013.01); F02D 2200/501 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method of managing a powertrain having an internal combustion engine and a transmission during transmission gear changes, the method comprising:
receiving an indication of a proposed gear change indicative of an intent to shift from a first transmission gear to a second transmission gear, the first transmission gear being a current operational gear;
in response to the indication of the proposed gear change, determining a target engine speed that is suitable for use in association with the second transmission gear after the proposed gear change is completed;
after determining the target engine speed, determining a target firing fraction or induction ratio suitable to adjust a speed of the engine to the target engine speed, wherein the target firing fraction or induction ratio is suitable for providing desired engine power output based on the target engine speed;
directing a change to the target firing fraction or induction ratio if the target firing fraction or induction ratio is different from a current firing fraction; and
adjusting an engine speed to the target engine speed.