Controlled exhaust gas fuel atomizing nozzle

A controlled exhaust gas fuel atomizing nozzle for an internal combustion engine having a carburetor for supplying air flowing from an air metering valve upstream thereof and for supplying fuel from a source of fuel under pressure to an induction passage, the carburetor having a throttle plate with at least one secondary throttle controlled opening therethrough positioned in the induction passage of the carburetor downstream of the air metering valve for controlling secondary air flow to an intake manifold of the engine and an exhaust passage for exhaust flow from the engine;

• said exhaust gas fuel atomizing nozzle including a housing means adapted to be positioned in the induction passage, said housing means having an inlet passage therein terminating at an induction port opening toward the intake manifold downstream of the throttle plate, a stepped valve guide bore in said housing means extending from said induction port through said housing means concentric with said induction port, a poppet valve movably supported in said housing means for movement between a first position partly blocking flow through said induction port to a second position permitting full flow through said induction port, said poppet valve including a stem slidably journalled in said stepped valve guide bore to extend from said housing means, said stem forming with said stepped valve guide bore a first annulus and a second annulus below said first annulus and in communication therewith, said second annulus being of a predetermined size and opening into said inlet passage directly above the head of said poppet valve, spring means operatively connected to said poppet valve to normally bias said poppet valve to said first position, lever means actuatable by an operator operatively connected to said poppet valve for effecting movement of said poppet valve toward said second position, an air passage connected at one end to said induction passage upstream of said secondary throttle controlled opening and downstream of the air metering valve and at its other end to said inlet passage, an exhaust gas recirculating line including an exhaust control valve means connected between said exhaust passage and said inlet passage, said exhaust control valve means having a scheduled flow path therethrough, a fuel valve means operatively connectable to the source of fuel for controlling fuel flow from a source of fuel under pressure to said first annulus as a function of fuel pressure, and said exhaust control valve means further including means responsive to movement of said fuel valve means for effecting operation of said exhaust control valve means as a function of fuel pressure sensed by said fuel valve means.

A controlled exhaust gas fuel atomizing nozzle for an internal combustion engine having a carburetor for supplying air flowing from an air metering valve upstream thereof and fuel from a source of fuel under pressure to an induction passage connected to the intake manifold for the engine, a throttle plate with at least one secondary throttle controlled opening therein in said induction passage for controlling air flow therethrough to the intake manifold, and an exhaust passage for exhaust gas flow from the engine, said atomizing nozzle including a housing means positioned in said induction passage, said housing means having an inlet passage therein terminating at an annular induction port opening toward said intake manifold downstream of the throttle plate, a stepped stem bore extending from one end of said housing through to said inlet passage adjacent to said induction port and concentric therewith, a poppet valve having a stem reciprocally journalled in said stepped stem bore and having a head positioned to control flow through said induction port, said stem extending from said housing means whereby said poppet valve can be reciprocated between a partly closed position and an open position relative to said induction port and forming with said stepped bore a first annulus of a predetermined size opening into said induction port and a second annulus of a diameter greater than said first annulus and in communication therewith, spring means operatively connected to said stem and to said housing means to normally bias said poppet valve to a first position blocking flow through said induction port, lever means operatively connected to said poppet valve and operatively connectable for actuation by an operator to effect movement of said poppet valve to a second position permitting flow through said induction port, an air-exhaust mixing valve means fixed to said housing means and having a scheduled air flow path therethrough for connecting said induction passage downstream of said air metering valve to said inlet passage and having a scheduled exhaust flow path therethrough for connecting said exhaust passage to said inlet passage, said air-exhaust mixing valve further including a valve shaft and a valve plate fixed thereon for pivotal movement to control flow through said scheduled exhaust flow path, said housing means having a fuel chamber therein connected to said source of fuel, an orifice passage extending from said fuel chamber to said second annulus, a spring bellows assembly fixed at one end in said chamber and having its opposite end freely movable as a function of fuel pressure within said chamber, a valve fixed to said opposite end of said bellows for movement therewith and positioned to control the flow of fuel from said fuel chamber through said orifice passage, a plunger slidably journalled in said bellows assembly and positioned with one end thereof abutting said opposite end of said bellows assembly and its opposite end extending from said housing means, and lever means operatively connected to said plunger and to said valve shaft to effect movement of said valve plate to effect opening and closing of said scheduled exhaust flow path whereby an scheduled ratio of exhaust gas recirculation to air inlet flow through said passage to effect vaporization of fuel discharged from said first annulus is effected as fuel pressure increases.