Air intake side secondary air supply system for an internal comb

Internal-combustion engines – Charge forming device – Multiple carburetors

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123587, 123588, 123440, F02M 2306, F02M 2308, F02M 2310

Patent

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046901213

ABSTRACT:
An air intake side secondary air supply system for an internal combustion engine having an air intake side secondary air supply passage and an O.sub.2 sensor controls a duty ratio of opening and closing of an open/close valve disposed in the air intake side secondary air supply passage in accordance with a detected air-fuel ratio of mixture by means of an output signal of the O.sub.2 sensor. The system sets a base valve open period of the open/close valve every predetermined period and decreases the base valve open period by a first predetermined correction amount when the detected air-fuel ratio is leaner than a target air-fuel ratio, and increases the base valve open period by a second predetermined correction amount when the detected air-fuel ratio is richer than the target air-fuel ratio.

REFERENCES:
patent: 4136651 (1979-01-01), Hattori et al.
patent: 4478191 (1984-10-01), Kinoshita et al.
patent: 4478192 (1984-10-01), Kinoshita et al.
patent: 4566419 (1986-01-01), Ninomiya et al.

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