Air-fuel ratio controlling apparatus for an internal combustion

Details Air-fuel ratio controlling apparatus for an internal combustion Air-fuel ratio controlling apparatus for an internal combustion

1977-03-31

1979-08-21

Croyle, Carlton R.

Internal-combustion engines

Noncompression

123119DB, 123124A, 123124B, F02M 700, F02M 2304

Patent

active

041649141

ABSTRACT:
An apparatus for controlling the air-fuel ratio of an air-fuel mixture to be supplied into a combustion chamber of an internal combustion engine comprises a passage bypassing a carburetor and a throttle valve of the engine for supplying an additional air into the engine intake duct downstream of the throttle valve to dilute the air-fuel mixture to an air-fuel ratio most suited for the engine operation. An air valve is provided in the bypass passage to vary the air-flow cross-sectional area of the passage. The opening of the air valve is controlled mainly in accordance with the air-fuel ratio of the mixture as detected by an air-fuel ratio detector in the path of flow of engine exhaust gases. A variable orifice is provided in the bypass passage downstream of the air valve and defined by a valve seat and a needle valve operatively associated therewith to vary the opening area of the orifice. The needle valve is actuated by a pneumatic valve actuator which is responsive to variations in the engine manifold vacuum. The arrangement is such that the pressure difference across the air valve is kept substantially constant whereby the supply of the additional air is substantially in proportion to the engine intake air and free from influence by the engine manifold vacuum.

REFERENCES:
patent: B405899 (1976-03-01), Moriya et al.
patent: 3677241 (1972-07-01), Gele et al.
patent: 3759232 (1973-09-01), Wahl et al.
patent: 3911884 (1975-10-01), Moriya et al.
patent: 3977375 (1976-08-01), Laprade et al.
patent: 4015568 (1977-04-01), Horiye et al.
patent: 4036186 (1977-07-01), Hattori et al.

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