Exhaust manifold air injection system

Claim 2

In an internal combustion engine system having a primary engine assembly wherein a mixture of fuel and air are explosively ignited to produce a mechanical motion, a throttle controlled air intake manifold, a fuel delivery system delivering fuel to the engine assembly in proportion to the air mass being inhaled, and an exhaust system for directing the gases expelled from the engine assembly to the atmosphere, an improvement for injecting supplemental air into the exhaust system having a fixed ratio to the amount to the gases expelled by the engine thereby reducing the emission of undesirable exhaust gases into the atmosphere comprising: an air pump; driving means, interconnecting said pump with said engine, operative to drive said air pump at a speed proportional to the speed of said engine; an enclosed input passage connecting said pump to the air intake manifold at a point therein downstream of the throttle and upstream of the fuel delivery system; and an enclosed output passage connecting said pump to the engine''s exhaust system, wherein the mass of the supplemental air being injected into the engine''s exhaust system from said pump is proportional to the speed of the engine and the throttle controlled less than ambient air pressure in the intake manifold downstream of the throttle.

Claim 3

The system as claimed in claim 1 wherein said air pump is a positive displacement air pump, operative to pump an air mass within a given period of time proportional to the operating speed of the pump and the absolute pressure of the air at the intake port of said pump.

Claim 4

In combination with an internal combustion engine system having a primary engine assembly wherein a mixture of fuel and air are explosively ignited to produce a mechanical motion, a throttle controlled air intake manifold, a fuel delivery system delivering fuel to the engine assembly in proportion to the air mass being inhaled, an exhaust manifold for directing the gases expelled from the engine assembly to the atmosphere, and an air injection system for injecting supplementary air into the exhaust manifold to enhance the oxidation of unburned gases being expelled by the engine, and reduce the emission of undesirable gases, an improvement for controlling the amount of supplementary air being injected into the exhaust manifold comprising: an air pump; driving means, interconnecting said pump with said engine, operative to drive said air pump at a speed proportional to the speed of said engine; an enclosed input passage connecting said pump to the engine intake manifold downstream of the throttle and upstream of said fuel delivery system; and an enclosed output passage, connecting said pump to the engine''s exhaust system, wherein the mass of the supplemental air being injected into the exhaust manifold by said pump is directly proportional to the speed of the engine and the throttle controlled air pressure in the intake manifold.

Claim 5

In combination with an internal combustion engine system having a primary engine assembly wherein a mixture of fuel and air are explosively ignited to produce a mechanical motion, a throttle controlled air intake manifold, a fuel delivery system delivering fuel to the engine assembly in proportion to the air mass being inhaled, an exhaust manifold for directing the gases expelled from the engine assembly to the atmosphere, and an air injection system for injecting supplementary air into the exhaust manifold to enhance the oxidation of unburned gases being expelled by the engine, and reduce the emission of undesirable gases, an improvement for controlling the amount of supplementary air being injected into the exhaust manifold comprising: an air pump; driving means, interconnecting said pump with said engine, operative to drive said air pump at a speed proportional to the speed of said engine; an enclosed input passage connecting said pump to the engine intake manifold downstream of the throttle and upstream of said fuel delivery system; and an enclosed output passage, connecting said pump to the engine''s exhaust system, wherein the mass of the supplemental air being injected into the exhaust manifold by said pump is directly proportional to the speed of the engine and the throttle controlled air pressure in the intake manifold.

Claim 6

The system as claimed in claim 3 wherein said air pump is a positive displacement air pump, operative to pump an air mass proportional to the operating speed of the pump and the pressure of the air at the intake port of said pump.

Claim 7

An air injection system for supplying supplementary air to the exhaust manifold of an internal combustion engine system proportional to the amount of exhaust gases being emitted wherein said engine system comprises a primary engine assembly wherein a mixture of fuel and air are explosively ignited to produce a mechanical motion, a throttle controlled air intake manifold, a fuel delivery system delivering fuel to the engine assembly in proportion to the air mass being inhaled, and an exhaust system for directing the gases expelled from the engine assembly to the atmosphere, said air injection system comprising: an air pump; driving means, interconnecting said pump with said engine, operative to drive said air pump at a speed proportional to the speed of the engine; an enclosed air input passage connecting said pump to said engine intake manifold, downstream of the throttle, and upstream of the fuel delivery system; an enclosed air output passage, connecting said pump to the engine''s exhaust system wherein the supplemental air being injected into the exhaust manifold by said pump is directly proportional to the speed of the engine and the throttle controlled air pressure in the intake manifold.

Claim 8

An air injection system for supplying supplementary air to the exhaust manifold of an internal combustion engine system proportional to the amount of exhaust gases being emitted wherein said engine system comprises a primary engine assembly wherein a mixture of fuel and air are explosively ignited to produce a mechanical motion, a throttle controlled air intake manifold, a fuel delivery system delivering fuel to the engine assembly in proportion to the air mass being inhaled, and an exhaust system for directing the gases expelled from the engine assembly to the atmosphere, said air injection system comprising: an air pump; driving means, interconnecting said pump with said engine, operative to drive said air pump at a speed proportional to the speed of the engine; an enclosed air input passage connecting said pump to said engine intake manifold, downstream of the throttle, and upstream of the fuel delivery system; an enclosed air output passage, connecting said pump to the engine''s exhaust system wherein the supplemental air being injected into the exhaust manifold by said pump is directly proportional to the speed of the engine and the throttle controlled air pressure in the intake manifold.

Claim 9

The system as claimed in claim 5 wherein said air pump is a positive displacement air pump, operative to pump an air mass within a given period of time, proportional to the operating speed of the pump and the absolute pressure of the air at the intake port of said pump.

Claim 10

In an internal combustion engine having a throttle controlled air intake manifold, a fuel delivery system connected downstream of the throttle for delivering fuel to the engine in proportion to the air being inducted, and an exhaust system for exhausting exhaust gases from the engine to the atmosphere, an improved air injected exhaust system for reducing the emission of certain exhaust gas constituents comprising: an air injection conduit having an inlet enD and an outlet end, said inlet end connected intermediate said throttle and said fuel delivery means so that pressure at said inlet end and at said fuel delivery system are substantially the same less-than-atmospheric pressure, and said outlet end connected to the engine exhaust system; air pump means connected intermediate said inlet end and said outlet end of said conduit for controllably pumping air mass from said inlet end to said outlet end; and drive means connecting said air pump and said engine operative to drive said air pump at a speed proportional to the speed of said engine, whereby with the fuel delivery system and the air injection conduit inlet both exposed to substantially the same less-than-atmospheric pressure and with the air pump means pumping in proportion to the speed of the engine, the air mass injected into the control system is controlled to effect a predetermined ratio to the exhaust mass being expelled by the engine.

Claim 11

In an internal combustion engine having a throttle controlled air intake manifold, a fuel delivery system connected downstream of the throttle for delivering fuel to the engine in proportion to the air being inducted, and an exhaust system for exhausting exhaust gases from the engine to the atmosphere, an improved air injected exhaust system for reducing the emission of certain exhaust gas constituents comprising: an air injection conduit having an inlet enD and an outlet end, said inlet end connected intermediate said throttle and said fuel delivery means so that pressure at said inlet end and at said fuel delivery system are substantially the same less-than-atmospheric pressure, and said outlet end connected to the engine exhaust system; air pump means connected intermediate said inlet end and said outlet end of said conduit for controllably pumping air mass from said inlet end to said outlet end; and drive means connecting said air pump and said engine operative to drive said air pump at a speed proportional to the speed of said engine, whereby with the fuel delivery system and the air injection conduit inlet both exposed to substantially the same less-than-atmospheric pressure and with the air pump means pumping in proportion to the speed of the engine, the air mass injected into the control system is controlled to effect a predetermined ratio to the exhaust mass being expelled by the engine.