US Patent No. 10,611,359

MANAGING ENGINE FIRING FRACTION CHANGES DURING GEAR SHIFTS


Patent No. 10,611,359
Issue Date April 07, 2020
Title Managing Engine Firing Fraction Changes During Gear Shifts
Inventorship Xiaoping Cai, Fremont, CA (US)
Louis J. Serrano, Los Gatos, CA (US)
Andrew W. Phillips, Rochester, MI (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 10,611,359

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 whether a first effective firing fraction that is a current operational effective firing fraction is suitable for use in association with the second transmission gear after the proposed gear change is completed;
when it is determined that the current effective firing fraction is not suitable for use after the gear change is completed, directing a change to a second effective firing fraction that is suitable for use in association with the second transmission gear after the proposed gear change is completed, the second effective firing fraction being different than the first effective firing fraction; and
shifting from the first transmission gear to the second transmission gear, wherein the change to the second effective firing fraction occurs before the shift to the second transmission gear is completed.