US Patent No. 9,212,610

ENGINE DIAGNOSTICS WITH SKIP FIRE CONTROL


Patent No. 9,212,610
Issue Date December 15, 2015
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. 9,212,610

1. A method comprising:
operating a engine in a skip fire manner to deliver a desired engine output; identifying a time period during skip fire operation
that is suitable for initiating or performing a selected engine diagnosis, wherein the selected engine diagnosis utilizes
a sensor that is associated with a group of cylinders and the identified time period is one selected from the group consisting
of (i) a time period in which a single first cylinder in the group of cylinders is fired a plurality of times in isolation
relative to the sensor used in the diagnosis, and (ii) a time period in which no cylinder in a first bank of cylinders associated
with the sensor used in the diagnosis is fired over the course of at least one engine cycle while at least one other cylinder
not associated with the first bank of cylinder is fired; and

conducting or initiating the selected engine diagnosis during the identified time period while the engine is operated in a
skip fire manner to deliver the desired engine output.