US Patent No. 9,328,672

ENGINE BRAKING CONTROLLER


Patent No. 9,328,672
Issue Date May 03, 2016
Title Engine Braking Controller
Inventorship Louis J. Serrano, Los Gatos, CA (US)
Steven E. Carlson, Oakland, CA (US)
Joshua P. Switkes, Menlo Park, CA (US)
Ronald D. Yuille, Sarasota, FL (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 9,328,672

1. A method of controlling the amount of engine braking provided by an engine having at least one working chamber, the method
comprising:
determining a desired amount of engine braking; and
operating the engine in a skip cylinder engine braking mode that substantially delivers the desired amount of engine braking,
wherein in the skip cylinder engine braking mode, selected working cycles of at least one selected working chamber are deactivated
and other selected working cycles of the at least one selected working chamber are operated in a braking mode such that at
least one working chamber is sometimes deactivated and sometimes operated in the braking mode, and wherein at least some of
the working cycles operated in a braking mode, fuel is delivered to the working chambers operated in the braking mode, the
working chambers operated in the braking mode are fired and the fired working chambers in the braking mode each generate a
net negative torque.