Air-fuel ratio control system for internal combustion engines

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

1997-08-07

1999-09-21

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

F02M 700

Patent

active

059540281

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine includes an air-fuel ratio sensor arranged in an exhaust system thereof for generating an output substantially proportional in value to an air-fuel ratio of exhaust gases emitted from the engine. An amount of variation in combustion of the engine is detected. A desired air-fuel ratio of a mixture supplied to the engine is set to a value leaner than a stoichiometric air-fuel ratio based on the amount of variation in combustion of the engine, when the engine is in a predetermined operating condition. Feedback control of an air-fuel ratio of the mixture to the desired air-fuel ratio is carried out in response to the output from the air-fuel ratio sensor. The desired air-fuel ratio is set to a richer value than an immediately preceding value thereof when the amount of variation in combustion of the engine detected is large and to a leaner value than the immediately preceding value thereof when the amount of variation in combustion of the engine is small. A value of the desired air-fuel ratio set is learned as an actual lean limit of the air-fuel ratio for stable combustion of the engine. A rate of change of the desired air-fuel ratio is adjusted based on the learned value of the desired air-fuel ratio.

REFERENCES:
patent: 5144932 (1992-09-01), Miyashita et al.
patent: 5209213 (1993-05-01), Miyashita et al.
patent: 5224452 (1993-07-01), Tomizawa
patent: 5224454 (1993-07-01), Miyashita et al.
patent: 5493901 (1996-02-01), Kuroda et al.
patent: 5630397 (1997-05-01), Shimizu et al.

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