Air intake side secondary air supply system for an internal comb

Details Air intake side secondary air supply system for an internal comb Air intake side secondary air supply system for an internal comb

1986-01-14

1987-09-01

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Multiple carburetors

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

Patent

active

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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