US Patent No. 9,416,746

METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE, METHOD FOR SWITCHING OFF AN INTERNAL COMBUSTION ENGINE AND ENGINE CONTROL DEVICE


Patent No. 9,416,746
Issue Date August 16, 2016
Title Method For Operating An Internal Combustion Engine, Method For Switching Off An Internal Combustion Engine And Engine Control Device
Inventorship Jan Harmsen, Simpelveld (NL)
Matthew Allen Schneider, Aachen (DE)
Alexey A. Dubkov, Novosibirsk (RU)
Monika Angst, Aachen (DE)
Assignee Ford Global Technologies, LLC, Dearborn, MI (US)

Claim of US Patent No. 9,416,746

1. A method for an engine, comprising:
during engine operation with non-shutdown conditions, operating the engine with lean combustion when an NOx storage capacity
of a lean NOx trap is below a threshold;

responsive to an engine shut down signal being detected, delaying engine shutdown and operating the engine with rich combustion
until regeneration of the lean NOx trap reaches a threshold level; and

responsive to the engine shut down signal not being detected, determining that an engine shutdown is expected within a given
period of time and operating the engine with rich combustion until regeneration of the lean NOx trap reaches the threshold
level.