Egr enrichment valve

Claim 2

In an engine having an exhaust manifold, an intake manifold and a system for inducting a mixture of air and fuel into said intake manifold having a carbureted mixture flow controlled by a throttle, and means for recirculating exhaust gases from said exhaust manifold back into said intake manifold, the combination comprising: a. means for metring supplementary fuel to said induction system in response to the dissipation of the vacuum level in said intake manifold, and b. secondary means for metering additional fuel to said induction system in response to an increase in the vacuum signal obtained from said system immediately adjacent and in advance of said throttle.

Claim 3

The combination as in claim 1, in which the secondary means for metering additional fuel comprises a fuel having an orifice normally exposed to the fuel reservoir of said induction system, resilient means for urging said valve to a normally closed position, and a diaphragm assembly communicating with the vacuum signal upstream from said throttle in a manner to overcome said resilient means for opening said valve in response to the advance vacuum obtained during cruising conditions of the engine.

Claim 4

The combination as in claim 1, in which the secondary means for metering additional fuel has a restriction to limit the maximum flow of fuel to said intake manifold.

Claim 5

For use with an internal combustion engine having a manifold subject to engine intake vacuum, means for recirculating engine exhaust gases back to said manifold, a control operated by vacuum responsive regulator for admitting said recirculation, and carburetion means having a throttle and a first port subject to vacuum slightly in advance of said throttle and a second port subject to vacuum downstream of said throttle, the combination comprising: a. means defining first and second fuel valves each calibrated independently for effecting supplementary addition of fuel to said carburetion means under predetermined conditions, b. means effective to communicate said first port with said first fuel valve for actuation thereof in response to a first predetermined range of engine conditions, and c. means effective to communicate said second port with said second fuel valve for actuation thereof in response to a predetermined range of engine conditions different then those for said first fuel valve.

Claim 6

For use with an internal combustion engine having a manifold subject to engine intake vacuum, means for recirculating engine exhaust gases back to said manifold, a control operated by vacuum responsive regulator for admitting said recirculation, and carburetion means having a throttle and a first port subject to vacuum slightly in advance of said throttle and a second port subject to vacuum downstream of said throttle, the combination comprising: a. means defining first and second fuel valves each calibrated independently for effecting supplementary addition of fuel to said carburetion means under predetermined conditions, b. means effective to communicate said first port with said first fuel valve for actuation thereof in response to a first predetermined range of engine conditions, and c. means effective to communicate said second port with said second fuel valve for actuation thereof in response to a predetermined range of engine conditions different then those for said first fuel valve.

Claim 7

The combintation as in claim 4 in which said carburetor has a booster venturi containing an internal channel for inducting fuel to the air flow through said booster venturi substantially about the annular interior thereof, said channel being in communication with said first and second fuel valves for providing induction of said fuel to said manifold.