McCoy Russell LLP
System and method for diesel exhaust fluid injector cleaning
Methods and systems are provided for cleaning a urea-clogged diesel exhaust fluid (DEF) injector included in a selective catalytic reduction (SCR) engine exhaust after-treatment system. In one example, a method may include, responsive to a diagnostic code indicating a clogged DEF injector, operating an engine in a DEF injector cleaning mode comprising operating the engine at a high idle speed, activating a DEF pump to deliver a desired amount of DEF at a desired flowrate, and measuring a duty cycle of DEF pump activation during DEF delivery. Responsive to the duty cycle being greater than a threshold duty cycle for a duration, DEF flow restoration is indicated.
Ford Global Technologies, LLC
F Y F F Y F F F F Y
F01N Y02T F01N F01N Y02T F01N F02B F01N F01N Y02A
inventional additional additional additional additional additional inventional inventional inventional additional
Robert James John James Smarr Jonathan Matthew Matthew
Merrell Roberts Collins Green Hargis