Secondary air supply control apparatus for internal combustion e

Details Secondary air supply control apparatus for internal combustion e Secondary air supply control apparatus for internal combustion e

1979-05-23

1981-01-20

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60289, F01N 310

Patent

active

042454727

ABSTRACT:
A secondary air supply control apparatus for an internal combustion engine comprises an air pump for producing the secondary air flow, a secondary air supply passage leading to an exhaust system of the engine, a bypass passage leading to the atmosphere, and a valve element connected to a diaphragm. The diaphragm constitutes one wall of a pressure chamber which is supplied with a negative intake pressure prevailing in an intake system of the engine, so as to move the valve element to a position at which the secondary air flow is directed to the secondary air supply passage when the negative intake pressure is higher than a predetermined level. There is provided a control unit operable in response to the pressure of the secondary air flow supplied to the exhaust system to apply the atmospheric pressure to the pressure chamber, thereby moving the valve element to another position at which the secondary air flow is directed to the bypass passage when the pressure of the secondary air flow supplied to the exhaust system is increased beyond a level which imposes overload on the air pump.

REFERENCES:
patent: 3433242 (1969-03-01), Voorheis
patent: 3903695 (1975-09-01), Nakada
patent: 3908370 (1975-09-01), Kuroda
patent: 3934413 (1976-01-01), Beiswenger
patent: 3950943 (1976-04-01), Paddock
patent: 4007756 (1977-02-01), Umino
patent: 4139983 (1979-02-01), Shibata

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