Secondary air supply system for internal combustion engines

Details Secondary air supply system for internal combustion engines Secondary air supply system for internal combustion engines

1977-12-06

1979-04-03

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

F01N 310

Patent

active

041470338

ABSTRACT:
A relief pressure control valve for controlling the pressure in a secondary air supply line has first and second pressure chambers divided by a diaphragm, a spring for biasing the diaphragm towards the second pressure chamber, a relief port connected to the secondary air supply line, a valve head connected to the diaphragm and being biased to close the relief port.
The air pumped out from an air pump is supplied to the first pressure chamber and the first pressure chamber is communicated with the second pressure chamber through an orifice. Accordingly, during stable running operations of the engine, the pressures in the first and second pressure chambers are made equal by means of the orifice, while during the accelerations pressure difference is produced between the chambers for a certain time period. The pressure difference urges the diaphragm in the same direction as that of the urging force of the spring, whereby the pressure in the secondary air supply line controlled by the relief pressure control valve is increased during the accelerations so as to supply the increased amount of the secondary air to the exhaust pipe of the engine.

REFERENCES:
patent: 3591961 (1971-07-01), Woodward
patent: 3748855 (1973-07-01), Day
patent: 3791146 (1974-02-01), Hayashi
patent: 3805522 (1974-04-01), Sheppard
patent: 3945205 (1976-03-01), Atago
patent: 3975905 (1976-08-01), Shimo

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