The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 2018
Filed:
Feb. 22, 2018
Tula Technology, Inc., San Jose, CA (US);
GM Global Technology Operations Llc, Detroit, MI (US);
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);
Tula Technology, Inc., San Jose, CA (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A variety of methods and arrangements are described for controlling transitions between firing fractions during skip fire or other dynamic firing level modulation operation of an engine. In general, actuator first transition strategies are described in which an actuator position (e.g., cam phase, TCC slip, etc.) is changed to, or close to a target position before a corresponding firing fraction change is implemented. When the actuator change associated with a desired firing fraction change is relatively large, the firing fraction change is divided into a series of two or more firing fraction change steps. A number of intermediate target selection schemes are described as well.