Vehicle emission air injection

Details Vehicle emission air injection Vehicle emission air injection

1994-09-14

1996-02-20

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

137506, 137510, 1376142, F01N 322

Patent

active

054919762

ABSTRACT:
A valve for an automotive vehicle emission system is provided which includes a valve housing with an inlet communicating the valve housing with an air pump; an outlet fluidly communicating the valve with a catalytic converter, the outlet having a check valve preventing flow from an engine exhaust conduit through the valve to the air pump; an upper diaphragm in the valve housing creating a first chamber in the housing which is fluidly exposed to the inlet; a lower diaphragm in the housing creating a second chamber between itself and the first diaphragm, the lower diaphragm forming a third chamber between itself and the housing generally opposite the first chamber; a sealing wall located within the housing separating the second chamber from the inlet, the sealing wall having a surface forming a valve seat with the lower diaphragm, dividing the inlet from the second chamber; a spring urging the lower diaphragm toward the first chamber; and a valve stem connecting the upper and lower diaphragms wherein the air pressure within the lower chamber causes a generally equal force on the upper diaphragm to move in a first direction as it causes on the lower diaphragm to move in a second direction opposite from the first direction, moving the lower diaphragm away from the sealing wall.

REFERENCES:
patent: 3910040 (1975-10-01), Garcea
patent: 3942321 (1976-03-01), Eckhardt et al.
patent: 4178755 (1979-12-01), Klimazewski et al.
patent: 4269028 (1981-05-01), Hattori
patent: 4342194 (1982-08-01), Paddock et al.
patent: 4370102 (1983-01-01), Sasaki et al.
patent: 4630642 (1986-12-01), Detweiler
patent: 5065575 (1991-11-01), Cook et al.
patent: 5301504 (1994-04-01), Bertling et al.

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