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

1986-05-06

Cuchlinski, Jr., William A.

Internal-combustion engines

Charge forming device

Auxiliary air or oxygen added to combustible mixture

123589, F02M 2304

Patent

active

045864810

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. The second secondary air passage includes a second vacuum operated air control valve and an electrically operated air control valve positioned in series. A vacuum control which includes an electrically operated vacuum control valve operates the first and second vacuum operated air control valves to vary the effective area of the two air passages. 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 second electrically operated air control valve to open and close the second secondary air passage. The air-fuel ratio control also operates the electrically operated vacuum control valve to gradually open and close the first and second vacuum operated air control valves to gradually open and close the first and second secondary air passages.

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

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