Daniel J Draper

US Patent:

20050241297, Nov 3, 2005

Filed:

Apr 30, 2004

Appl. No.:

10/836656

Inventors:

Wenbo Wang - Novi MI, US
Igor Anilovich - Walled Lake MI, US
Louis Avallone - Linden MI, US
Daniel Draper - Fenton MI, US
Michael Emmorey - Brighton MI, US
Brian Wallace - Grand Blanc MI, US

International Classification:

F01N003/00

US Classification:

060276000, 060285000, 060274000

Abstract:

A control system and method for optimizing fuel control in an internal combustion engine utilizes a signal from an oxygen sensor disposed in an exhaust downstream of a catalytic converter. An air/fuel mixture introduced into the engine is compensated based on the signal exceeding predetermined enabling thresholds. The predetermined rich or lean condition enable threshold represents an oxygen content so less or greater than desired that the normal closed loop control including regular secondary fuel trim is not sufficient enough to bring the outlet oxygen sensor signal back to the desired window quickly. A reduced or increased amount of fuel is introduced into the engine based on the signal exceeding the predetermined rich or lean enable threshold respectively.