US Patent No. 10,094,313


Patent No. 10,094,313
Issue Date October 09, 2018
Title Coordination Of Vehicle Actuators During Firing Fraction Transitions
Inventorship Louis J. Serrano, Los Gatos, CA (US)
Steven E. Carlson, Oakland, CA (US)
Steven J. Haase, Okemos, MI (US)
Donavan L. Dibble, Utica, MI (US)
Allen B. Rayl, Waterford, MI (US)
Assignee Tula Technology, Inc., San Jose, CA (US) GM Global Technology Operations L...

Claim of US Patent No. 10,094,313

1. A method of controlling an engine to deliver a requested engine output, the method comprising:(a) while the engine is operating at a first effective firing fraction and an associated first cam phase, determining a requested effective firing fraction that is different than the first effective firing fraction, the requested effective firing fraction being a second effective firing fraction having an associated second cam phase, the second cam phase being different than the first cam phase;
(b) selecting an intermediate effective firing fraction that is between the first and second effective firing fractions, the intermediate effective firing fraction having an associated intermediate cam phase;
(c) identifying the selected intermediate effective firing fraction as a target effective firing fraction and the intermediate cam phase as a target cam phase;
(d) initiating a transition from the first cam phase to one of the second cam phase or the target cam phase;
(e) after an actual cam phase is at or within a predetermined range of the target cam phase transitioning to the target effective firing fraction;
(f) when the target effective firing fraction is not the second effective firing fraction, selecting a next effective firing fraction having an associated next cam phase and setting the target effective firing fraction to be the next effective firing fraction and setting the target cam phase to be the next cam phase and causing the cam phase to transition towards the next cam phase or to transition towards or to continue transitioning towards the second cam phase; and
(g) iteratively repeating (e) and (f) until the requested effective firing fraction is reached; and
(h) directing operation of the engine during the transitions to deliver the requested engine output, whereby an actual commanded effective firing fraction changes over a course of the transitions, and
wherein operating the engine at at least one of the first, second and intermediate effective firing fractions involves operating the engine in a multi-level skip fire or multi-charge level operating mode.