US Patent No. 9,399,963


Patent No. 9,399,963
Issue Date July 26, 2016
Title Misfire Detection System
Inventorship 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)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 9,399,963

1. A method for detecting misfire in a skip fire engine control system, the method comprising:
assigning a window to a target firing opportunity for a target working chamber;
attempting to fire the target working chamber during the target firing opportunity;
measuring a change in an engine parameter during the window;
determining whether a firing opportunity before the target firing opportunity is a skip or a fire and whether a firing opportunity
after the target firing opportunity is a skip or a fire; and

determining whether the target working chamber misfired based at least in part on the skip or fire determination from before
and after the target firing opportunity and the measured change in the engine parameter.