Secondary air supply for internal combustion engine

Details Secondary air supply for internal combustion engine Secondary air supply for internal combustion engine

1984-09-04

1986-10-21

Cuchlinski, Jr., William A.

Internal-combustion engines

Engine speed regulator

Charge proportion varying

123589, F02M 2304

Patent

active

046178910

ABSTRACT:
A secondary air intake system is used in an internal combustion engine. The system supplies secondary air through a first and a second secondary air passage. The first secondary air passage includes a first vacuum operated air control valve. A vacuum control which includes an electrically operated vacuum control valve operates the first vacuum operated air control valve to vary the effective area of the first secondary air passage. The second secondary air passage includes a second vacuum operated air control valve and an electrically operated air control valve positioned in series. Intake manifold vacuum operates the second vacuum operated air control valve to vary the effective area of the second secondary air passage. An air-fuel ratio control which includes an intake air temperature sensor, an exhaust gas oxygen concentration sensor and a throttle plate vacuum sensor determines the engine air-fuel ratio to intermittently open and close the electrically operated air control valve to open and close the second secondary air control passage. The air-fuel ratio control also operates the electrically operated vacuum control valve to gradually open and close the first vacuum operated air control valve to gradually open and close the first secondary air passage.

REFERENCES:
patent: 4483308 (1984-11-01), Hasegawa
patent: 4495922 (1985-01-01), Fujimura et al.

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