Flow control valve for vehicle emissions control system

Details Flow control valve for vehicle emissions control system Flow control valve for vehicle emissions control system

1980-11-20

1982-08-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60289, 137 67, 137517, 137521, F01N 322, F16K 1306, F16K 1740

Patent

active

043454283

ABSTRACT:
A vehicle emissions control system includes an air pump (12), a catalytic converter (22) communicated to the air pump, and a bleed control valve (28) which controls the quantity of air communicated from the air pump to the catalytic converter. The bleed valve includes a support arm (50) which suspends a valve element (40) adjacent a tapered valve surface (36). The support arm relaxes in response to repeated flexing due to the pulsating output of the air pump. Accordingly, when the vehicle is new, the valve element is held away from the valve seat to permit substantially uninhibited communication through the bleed valve so that almost all of the air which would otherwise be communicated to the catalytic converter is bled off. As the vehicle is used, the support arm relaxes, which permits the valve element to move progressively closer to the valve surface, thereby decreasing the quantity of air bled off through the bleed valve to thereby progressively increase the quantity of air communicated to the catalytic converter.

REFERENCES:
patent: 2217380 (1940-10-01), Pedder
patent: 2367402 (1945-01-01), Kelly
patent: 2563200 (1951-08-01), Venning
patent: 2899981 (1959-08-01), Binks
patent: 3057373 (1962-10-01), Bragg
patent: 3380474 (1968-04-01), Mills
patent: 3523559 (1970-08-01), Gibson
patent: 3586018 (1971-06-01), Bogardh
patent: 3984976 (1976-10-01), Nagai
patent: 4000615 (1977-01-01), Bockelmann
patent: 4200596 (1980-04-01), Iiyama

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