US Patent No. 10,557,427


Patent No. 10,557,427
Issue Date February 11, 2020
Title Multi-level Firing Engine Control
Inventorship Matthew A. Younkins, San Jose, CA (US)
Louis J. Serrano, Los Gatos, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 10,557,427

1. A method of controlling operation of an internal combustion engine having a plurality of working chambers to deliver a desired output, wherein each working chamber has at least one cam-actuated intake valve and at least one exhaust valve, the plurality of working chambers including first and second sets of the working chambers, each set of working chambers including at least one working chamber, wherein working chambers in the first set are deactivatable and working chambers in the second set are not capable of being deactivated during operation of the engine, the method comprising:operating the engine to deliver a desired engine output by causing each of the working chambers in the second set to be fired during every engine cycle and causing the working chambers in the first set to sometimes be fired and sometimes be skipped; and
setting an air charge for each fired working cycle based on whether a high or low torque output was selected for the fired working cycle, whereby within a selected engine cycle, at least one fired working chamber has the high torque output and at least one other fired working chamber has the low torque output.