Method for controlling an air/fuel ratio of an internal combusti

Details Method for controlling an air/fuel ratio of an internal combusti Method for controlling an air/fuel ratio of an internal combusti

1987-03-03

1990-05-01

Lall, Parshotam S.

Boots, shoes, and leggings

36443105, 123489, 123440, 123480, F02B 5102, F02B 304

Patent

active

049224298

ABSTRACT:
A method for feedback controlling an air/fuel ratio of mixture supplied to an internal combustion engine to a target air/fuel ratio, which uses an output signal of an oxygen concentration sensor. The sensor's output signal is proportional to the oxygen concentration in the exhaust gas of the engine. When the target air/fuel ratio is set at a stoichiometric air/fuel ratio, the air/fuel ratio of the mixture is varied by a small amount around the stoichiometric value if the air/fuel ratio of mixture supplied to the engine is detected to be in a predetermined air/fuel ratio range which includes the stoichiometric air/fuel ratio. The determination of the air/fuel ratio is calculated from the output signal of the oxygen concentration sensor.

REFERENCES:
patent: 4365299 (1982-12-01), Kondo et al.
patent: 4430976 (1984-02-01), Kondo et al.
patent: 4467769 (1984-08-01), Matsumura
patent: 4580539 (1986-04-01), Kitahara
patent: 4646699 (1987-03-01), Yasuoka et al.

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