Air intake side secondary air supply system for an internal comb

Internal-combustion engines – Charge forming device – Auxiliary air or oxygen added to combustible mixture

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123589, F02M 2310

Patent

active

046605339

ABSTRACT:
Air intake side secondary air supply system for an internal combustion engine includes first and second secondary air supply passages leading to an intake manifold in which an open/close valve and an air control valve are respectively provided for a proportional control and an integral control of secondary air. In order to improve a driveability of the engine when no load is applied to the engine when the engine temperature is low, the air control valve is supplied with a pressure for rapidly closing the second air intake side secondary air supply passage so as to stop at least the integral control of the feedback control of air/fuel ratio immediately when a no-load condition is detected during a cold operation of the engine.

REFERENCES:
patent: 4541400 (1985-09-01), Kobayashi et al.
patent: 4569318 (1986-02-01), Fujimura et al.
patent: 4584979 (1986-04-01), Fujimura et al.
patent: 4586481 (1986-05-01), Kishida et al.

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