Method and apparatus for controlling air-fuel ratio in internal

Details Method and apparatus for controlling air-fuel ratio in internal Method and apparatus for controlling air-fuel ratio in internal

1984-04-17

1985-08-20

Cuchlinski,, Jr.,

Internal-combustion engines

Engine speed regulator

Charge proportion varying

123391, 123392, 36443105, F02M 5100

Patent

active

045357366

ABSTRACT:
Disclosed is a method of controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine. The method employs a feedback control in which the control is made to maintain the air-fuel ratio at the stoichiometric level in accordance with the air-fuel ratio read through the detection of a component of the exhaust gas and, at least during the idling of the engine after the warming up of the same, a lean control in which the control is made to maintain the air-fuel ratio at the leaner side of the stoichiometric level. The lean control is allowed when the mean value of the engine speed over a predetermined period is greater than a predetermined reference value during the idling after warming up of the engine, while the feedback control is conducted when the mean value is below the predetermined reference value. Disclosed also is an apparatus suitable for carrying out this method.

REFERENCES:
patent: 4425895 (1984-01-01), Yoshida et al.
patent: 4434768 (1984-03-01), Ninomiya
patent: 4471738 (1984-09-01), Smojver

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