US Patent No. 9,689,327


Patent No. 9,689,327
Issue Date June 27, 2017
Title Multi-level Skip Fire
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. 9,689,327

1. An engine controller for an engine including a plurality of working chambers, each working chamber including at least one
cam-actuated intake valve, the engine controller comprising:
a firing fraction calculator arranged to determine a firing fraction suitable for delivering a desired torque;
a firing timing determination module arranged to determine a skip fire firing sequence based on the firing fraction wherein
the skip fire firing sequence indicates whether, during a selected firing opportunity, a selected working chamber is deactivated
or fired and further indicates, for each fire, whether the fire generates a low torque output or a high torque output; and

a firing control unit that is arranged to operate the working chambers in a skip fire manner based on the firing sequence.