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

1993-05-19

1995-06-27

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123691, F01N 320

Patent

active

054269350

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine includes a LAF sensor and an O2 sensor arranged in an exhaust pipe at respective locations upstream and downstream of a catalytic converter. A desired air-fuel ratio coefficient used in calculating an amount of fuel supplied to the engine is calculated based on operating conditions of the engine, and corrected based on output from the O2 sensor. The air-fuel ratio of a mixture supplied to the engine is feedback-controlled to a stoichiometric air-fuel ratio based on the corrected desired air-fuel ratio coefficient. When the output from the O2 sensor falls within a predetermined range, the desired air-fuel ratio coefficient is not corrected, but held at an immediately preceding value thereof.

REFERENCES:
patent: 3939654 (1976-02-01), Creps
patent: 4130095 (1978-12-01), Bowler
patent: 4796425 (1989-01-01), Nagai et al.
patent: 5103640 (1992-04-01), Nada
patent: 5152137 (1992-10-01), Nishizawa
Patent Abstract of JP 2-67443 (in English) Communication from European Patent Office.
Patent Abstract of JP 61232350.
Patent Abstract of JP 4031644.

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