Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1978-07-27
1980-03-18
Myhre, Charles J.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
251 614, 55316, 220 85VR, F02M 5900, F16K 31365, B01D 5000
Patent
active
041933834
ABSTRACT:
In an evaporative control system for reducing emission of fuel vapors from an engine fuel system there is provided a vacuum operated valve arrangement having a two-position valve which is spring biased to open to permit venting of fuel vapor from a carburetor fuel bowl to a carbon canister when the engine is not running and is responsive to engine vacuum only above a predetermined negative pressure to close to prevent such venting when the engine is running, and a check valve and bleed valve arrangement which is operable to trap engine vacuum at the two-position valve at a vacuum at or above the predetermined negative pressure whenever the engine vacuum drops below such pressure to thereby maintain the two-position valve in its closed position preventing fuel vapor venting during engine running at low engine vacuum and operating to release the trapped engine vacuum at the two-position valve to thereby permit the valve to open to permit fuel vapor venting when the engine is not running.
REFERENCES:
patent: 1912203 (1933-05-01), Hueber et al.
patent: 3322142 (1967-05-01), Baumann
patent: 3628517 (1971-12-01), Soberski
patent: 3683597 (1972-08-01), Beveridge et al.
patent: 3752134 (1973-08-01), Hollis, Jr.
patent: 3986353 (1976-10-01), Otsubo et al.
patent: 4137882 (1979-02-01), Thornburgh
"Evaporative Emision Control System" (EECS) from Buick Chassis Manual, 1978, pp. 6c-65, 66.
General Motors Corporation
Lall P. S.
Myhre Charles J.
Phillips Ronald L.
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