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:
Mar. 27, 2018
Filed:
Oct. 20, 2016
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 and potentially variable displacement operation of an engine. In general, cam first transition strategies are described in which the cam phase is changed to, or close to a target cam phase before a corresponding firing fraction change is implemented. When the cam phase 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—with each step using a cam first transition approach. A number of intermediate target selection schemes are described as well.