Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Patent
1978-11-13
1981-01-06
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
60306, F01N 315
Patent
active
042428661
ABSTRACT:
An improved by-pass valve (1) for use in an automobile exhaust system (ES) comprises an air inlet (7) connected to an air pump (AP), first and second air outlets (15,23) respectively connected to first and second portions (P1,P2) of a catalytic converter (CC) and a third outlet (33) through which air is dumped to atmosphere. Air is directed from the inlet to the first outlet when engine temperature is less than a predetermined value and from the inlet to the second outlet when engine temperature reaches the predetermined value. A first and normally closed valve (81) is intermediate the air inlet and the first and second outlets and a second and normally open valve (83) is intermediate the air inlet and the third outlet. The first valve is opened and the second valve closed when engine vacuum exceeds a predetermined level so air flows to either the first or second outlet. The second valve is reopened whenever the outlet to which air is directed is blocked so air is dumped to atmosphere. To accomplish this, the first valve is mounted on the first section (111) of a split shaft (109) and the second valve is mounted on a second shaft section (113). The sections are movable in unison to open the first valve, but the second section is movable relative to the first section when a blockage occurs to reopen the second valve.
REFERENCES:
patent: 3479816 (1969-11-01), Masters
patent: 3906723 (1975-09-01), Matumoto
patent: 4178755 (1979-12-01), Klimazewski
patent: 4178953 (1979-12-01), White
ACF Industries Incorporated
Hart Douglas
Muller J. Joseph
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