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

1987-12-29

Cuchlinski, Jr., William A.

Internal-combustion engines

Charge forming device

Auxiliary air or oxygen added to combustible mixture

123589, F02M 2304

Patent

active

047153504

ABSTRACT:
An air intake side secondary air supply system for an internal combustion engine having an air intake system using a carburetor and an air intake side secondary air supply passage leading to the downstream of the carburetor, includes an oxygen concentration sensor producing an output signal whose level is substantially proportional to an oxygen concentration of the exhaust gas. A control means for controlling 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 result of comparison between the level of the output signal of the oxygen concentration sensor and a level corresponding to a target air-fuel ratio. The target air-fuel ratio is up-dated in response to at least two parameters indicative of the engine operation.

REFERENCES:
patent: 4364227 (1982-12-01), Yoshida et al.
patent: 4434768 (1984-03-01), Ninomiya
patent: 4558677 (1985-12-01), Hara
patent: 4561394 (1985-12-01), Kishida et al.
patent: 4584979 (1986-04-01), Fujimura et al.

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