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:
Jul. 26, 2016
Filed:
Mar. 12, 2014
Tula Technology Inc., San Jose, CA (US);
Charles H. Loucks, Santa Clara, CA (US);
Joel D. Van Ess, Campbell, CA (US);
Siamak Hashemi, Farmington Hills, CA (US);
Louis J. Serrano, Los Gatos, CA (US);
Mohammad R. Pirjaberi, San Jose, CA (US);
Shikui Kevin Chen, San Jose, CA (US);
Matthew A. Younkins, San Jose, CA (US);
Mark A. Shost, Northville, MI (US);
Mark A. Wilcutts, Berkeley, CA (US);
Tula Technology, Inc., San Jose, CA (US);
Abstract
A variety of methods and arrangements for detecting misfire in a skip fire engine control system are described. In one aspect, a window is assigned to a target firing opportunity for a target working chamber. A change in an engine parameter is measured during the window. A determination is made as to whether a firing opportunity before the target firing opportunity is a skip or a fire and/or whether a firing opportunity after the target firing opportunity is a skip or a fire. Based at least in part on this skip/fire determination, a determination is made as to whether the target working chamber has misfired. In various embodiments, if the target working chamber is identified as persistently misfiring, the firing sequence is modified so that the target working chamber is deactivated and excluded from the firing sequence. In still other embodiments, a torque model is used to detect engine-related problems.