US Patent No. 9,267,454


Patent No. 9,267,454
Issue Date February 23, 2016
Title Drive Train Slip For Vibration Mitigation During Skip Fire Operation
Inventorship Mark A. Wilcutts, Berkeley, CA (US)
Xin Yuan, Palo Alto, CA (US)
Joshua P. Switkes, Menlo Park, CA (US)
Steven E. Carlson, Oakland, CA (US)
John F. Impeduglia, Simpsonville, SC (US)
John W. Parsels, San Jose, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 9,267,454

1. A method of mitigating power train vibration during skip fire operation of an engine, the method comprising:
operating an engine in a skip fire operational mode; and
for each firing opportunity in a sequence of firing opportunities that occur during the skip fire operation of the engine,
determining a drive train component slip dynamically on an individual firing opportunity by firing opportunity basis, wherein
the slip of the drive train component associated with each firing opportunity is based at least in part upon a skip/fire decision
associated with such firing opportunity; and

modulating the slip of the drive train component in accordance with the determined drive train component slip, whereby in
at least some circumstances, the slip of the drive train will be adjusted both up and down for different firing opportunities
within a single engine cycle while operating in the skip fire mode.