Air-fuel ratio control method for internal combustion engines

Details Air-fuel ratio control method for internal combustion engines Air-fuel ratio control method for internal combustion engines

1991-09-25

1992-09-08

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

051449323

ABSTRACT:
An air-fuel ratio control method for an internal combustion engine. The air-fuel ratio of an air-fuel mixture supplied to the engine is feedback-controlled to a desired air-fuel ratio in response to output from an exhaust gas ingredient concentration sensor. When the desired air-fuel ratio is to be changed in a leaning direction from a value equal to or leaner than a stoichiometric air-fuel ratio, it is changed at a larger rate until it reaches a predetermined value than after it has reached the predetermined value. The predetermined value is set to a value slightly leaner than an air-fuel ratio at which the amount of emission of NO.sub.X increases.

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