US Patent No. 9,581,098


Patent No. 9,581,098
Issue Date February 28, 2017
Title Engine Diagnostics With Skip Fire Control
Inventorship Shikui Kevin Chen, San Jose, CA (US)
Xin Yuan, Palo Alto, CA (US)
Joshua P. Switkes, Menlo Park, CA (US)
Steven E. Carlson, Oakland, CA (US)
Mark A. Shost, Northville, MI (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 9,581,098

1. A method of operating an internal combustion engine having a plurality of cylinder banks, each bank including a plurality
of cylinders, the method comprising:
operating the engine in a skip fire operational mode that utilizes most evenly spaced firings;
while operating in the skip fire operational mode, identifying a period in which a single one of the cylinders in a first
cylinder bank is isolated as the only firing cylinder in the first cylinder bank; and

conducting a diagnosis of the isolated cylinder during the identified period, wherein the diagnosis conducted on the isolated
cylinder is not conducted on the isolated cylinder when such cylinder is not isolated.