US Patent No. 10,837,382


Patent No. 10,837,382
Issue Date November 17, 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. 10,837,382

1. A method of controlling operation of an internal combustion engine with an intake manifold and a plurality of working chambers to deliver a requested torque output, wherein each working chamber has at least one cam-actuated intake valve and at least one exhaust valve, the method comprising:requesting no torque output from the internal combustion engine;
shutting the intake and exhaust valves of all of the plurality of working chambers so that no air is delivered from the intake manifold into the working chambers of the internal combustion engine;
requesting a torque output from the internal combustion engine; and
in response to the torque output request, firing a selected working chamber of the plurality of working chambers during a selected working cycle, wherein the selected working chamber is capable of being fired at a high torque output level and a low torque output level, and the low torque output level is used unless the requested torque output exceeds a predetermined threshold, wherein an air charge is adjusted to obtain the low torque output level.