Air/fuel ratio control with adaptive learning of purged fuel...

F - Mech Eng,Light,Heat,Weapons – 02 – D

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Details

F02D 41/14 (2006.01) F02D 41/00 (2006.01) F02M 25/08 (2006.01) G05B 13/02 (2006.01)

Patent

CA 2052774

- 23 - ABSTRACT OF THE DISCLOSURE A system and method for controlling operation of an engine wherein a fuel vapor recovery system is coupled between an air/fuel intake and a fuel supply system. An air/fuel ratio indication is provided by a proportional plus integral feedback controller coupled to a two-state exhaust gas oxygen sensor. In response to the air/fuel ratio indication and a measurement of inducted air flow, a base fuel command is generated. To compensate for purging of fuel vapors, a reference air/fuel ratio is subtracted from the air/fuel ratio indication and the resulting error signal generated. This compensation factor represents a learned value which is directly related to fuel vapor concentration, and it is subtracted from the base fuel command to correct for induction of fuel vapors.

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