System for mixing air with fuel tank vapor

Claim 2

A fuel vapor recovery system for an internal combustion engine having an intake manifold and a fuel reservoir, an airfuel vapor mixing valve including a valve housing having passage means therein and a valve movable in said passage means between an open position and a closed position, valve operating means including a pressure responsive diaphragm in said housing to form a chamber therein, means operatively connecting said diaphragm and said valve whereby said valve may be positioned by said diaphragm, fuel vapor conduit means in communication with said fuel tank and with said chamber, metering orifice means connected to said fuel vapor conduit means and with said passage means, an air conduit means in communication with said passage means and with a source of atmospheric air, and conduit means in communication with said passage means and with said intake manifold, said metering orifice means and said air conduit means being operatively connected to said pAssage means in position whereby said valve when in said closed position will block flow of air and fuel vapor to said conduit means.

Claim 3

A fuel vapor recovery system according to claim 1 wherein said diaphragm in said housing forms a second chamber therein, spring means in said second chamber in operative relation to said diaphragm to normally bias said valve to said closed position.

Claim 4

A fuel vapor recovery system according to claim 2 wherein said metering orifice means includes a plurality of metering orifices of progressively larger diameters positioned so that as said valve moves from said closed position to said open position, said valve will sequentially unblock said metering orifices of progressively larger diameters.

Claim 5

A fuel vapor recovery system according to claim 2 wherein said valve is a spool valve having spaced apart upper and lower lands slideably journaled in said passage means and having a reduced portion between said upper and lower lands forming with said passage means a mixing chamber in communication with said conduit means, said metering orifice means and said air conduit means normally being blocked from the communication with said passage means by said upper land.

Claim 6

A fuel vapor recovery system according to claim 1 wherein said air-fuel vapor mixing valve further includes at least a second diaphragm forming with said diaphragm said chamber and with said valve housing an air chamber and second air conduit means in communication with said air chamber and with a source of atmospheric air, said valve extending through said second diaphragm in sealing engagement therewith.

Claim 7

A fuel vapor recovery system according to claim 1 wherein said air-fuel vapor mixing valve further includes a second diaphragm and a third diaphragm forming with said valve and said passage means an air chamber and a mixing chamber, second air conduit means in communication with said air chamber and with a source of atmospheric air, said conduit means being in communication with said passage means into said mixing chamber, said valve when moved from said closed position to said open position placing said air conduit means and said metering orifice means in communication with said mixing chamber.

Claim 8

A fuel vapor recovery system for an internal combustion engine having an air-fuel intake manifold and a fuel reservoir, a fuel vapor mixing valve including a valve housing having passage means therein and a valve movable in said passage means, pressure responsive diaphragm means in said housing operatively connected to said valve, fuel vapor conduit means in communication with said fuel tank and with one side of said diaphragm means whereby fuel vapor under pressure will effect movement of said diaphragm means for moving said valve, metering orifice means connected to said fuel vapor conduit means and with said passage means, an air conduit means in communication with said passage means and with a source of atmospheric air, and conduit means in communication with said passage means and with said intake manifold, said valve being movable from a first position blocking flow of air from said air conduit means and fuel vapor from said metering orifice means into said passage means to a second position to permit fluid communication between said metering orifice means, said air conduit means and said conduit means.

Claim 9

A fuel vapor recovery system for an internal combustion engine having an air-fuel intake manifold and a fuel reservoir, a fuel vapor mixing valve including a valve housing having passage means therein and a valve movable in said passage means, pressure responsive diaphragm means in said housing operatively connected to said valve, fuel vapor conduit means in communication with said fuel tank and with one side of said diaphragm means whereby fuel vapor under pressure will effect movement of said diaphragm means for moving said valve, metering orifice means connected to said fuel vapor conduit means and with said passage means, an air conduit means in communication with said passage means and with a source of atmospheric air, and conduit means in communication with said passage means and with said intake manifold, said valve being movable from a first position blocking flow of air from said air conduit means and fuel vapor from said metering orifice means into said passage means to a second position to permit fluid communication between said metering orifice means, said air conduit means and said conduit means.

Claim 10

A fuel vapor recovery system for an internal combustion engine having an air-fuel intake manifold and a fuel reservoir, a fuel vapor mixing valve including a valve housing having passage means therein, a fuel vapor conduit means connected in fuel vapor flow relation to said fuel tank, metering orifice means in communication with said fuel vapor conduit means and with said passage means, an air conduit means in communication with said passage means and with a source of atmospheric air, conduit means in communication with said passage means and with said air-fuel intake manifold, a valve movable in said passage means between a closed position to block communicatIon between said metering orifice means and said conduit means and between said air conduit means and said conduit means to an open position to permit fluid communication between said metering orifice means, said air conduit means and said conduit means, and differential pressure operating means connected to said valve to effect movement of said valve between said open position and said closed position, said differential pressure operating means including spring means to normally bias said valve to said closed position, and fuel vapor passage means in communication with said fuel vapor conduit means and said differential pressure operating means.

Claim 11

A fuel vapor recovery system for an internal combustion engine having an air-fuel intake manifold and a fuel reservoir, a fuel vapor mixing valve including a valve housing having passage means therein, a fuel vapor conduit means connected in fuel vapor flow relation to said fuel tank, metering orifice means in communication with said fuel vapor conduit means and with said passage means, an air conduit means in communication with said passage means and with a source of atmospheric air, conduit means in communication with said passage means and with said air-fuel intake manifold, a valve movable in said passage means between a closed position to block communicatIon between said metering orifice means and said conduit means and between said air conduit means and said conduit means to an open position to permit fluid communication between said metering orifice means, said air conduit means and said conduit means, and differential pressure operating means connected to said valve to effect movement of said valve between said open position and said closed position, said differential pressure operating means including spring means to normally bias said valve to said closed position, and fuel vapor passage means in communication with said fuel vapor conduit means and said differential pressure operating means.

Claim 12

A fuel vapor recovery system according to claim 8 wherein said metering orifice means includes a plurality of metering orifices of progressively larger diameters and wherein said valve is a spool valve having spaced apart lands with a reduced portion therebetween forming with said passage means a mixing chamber in communication with said conduit means, one of said lands blocking communication of said metering orifices and said air conduit means with said mixing chamber when said valve is in said closed position.