Air intake side secondary air supply system for an internal comb

Internal-combustion engines – Charge forming device – Multiple carburetors

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F02M 2304

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047153520

ABSTRACT:
An air intake side secondary air supply system for an internal combustion engine including an open/close valve disposed in an air intake side secondary air supply passage and an oxygen concentration sensor producing an output signal whose level is substantially proportional to an oxygen concentration of the exhaust gas, executes a duty ratio control of the open/close valve for a feedback control of the air fuel ratio of mixture to be supplied to the engine. When the air/fuel ratio has changed from rich to lean with respect to a target air/fuel ratio, a correction value for reducing the valve open period during the air/fuel ratio is detected to be lean, is increased. On the other hand, when the air/fuel ratio has changed from lean to rich with respect to the target air/fuel ratio, a correction value for increasing the valve open period during the air/fuel ratio is detected to be rich, is increased.

REFERENCES:
patent: 4356797 (1982-11-01), Matsui
patent: 4579099 (1986-04-01), Kishida et al.
patent: 4580541 (1986-04-01), Koumura
patent: 4586481 (1986-05-01), Kishida et al.

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