Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
126 words
In an engine exhaust gas cleaning system in which a portion of engine gases are recirculated from an engine exhaust systeM to an intake system of an internal combustion engine so as to reduce nitrogen oxide content in the engine exhaust gases, the improvement comprising a cylindrical chamber interposed between a carburetor and an intake pipe of the engine, an exhaust gas recirculation conduit providing fluid communication between an exhaust pipe of the engine and said cylindrical chamber, and a mixture conduit providing fluid communication betweenm the carburetor and said cylindrical chamber and having its outlet tangentially connected to the latter for establishing a swirling flow therein to promote mixing between the air-fuel mixture from the carburetor and the recirculated exhaust gases from the exhaust pipe.
Claim 2
Dependent Claim
126 words
In an engine exhaust gas cleaning system in which a portion of engine gases are recirculated from an engine exhaust systeM to an intake system of an internal combustion engine so as to reduce nitrogen oxide content in the engine exhaust gases, the improvement comprising a cylindrical chamber interposed between a carburetor and an intake pipe of the engine, an exhaust gas recirculation conduit providing fluid communication between an exhaust pipe of the engine and said cylindrical chamber, and a mixture conduit providing fluid communication betweenm the carburetor and said cylindrical chamber and having its outlet tangentially connected to the latter for establishing a swirling flow therein to promote mixing between the air-fuel mixture from the carburetor and the recirculated exhaust gases from the exhaust pipe.
Claim 3
Dependent Claim
24 words
An improved engine exhaust gas cleaning system according to claim 1, wherein said exhaust gas recirculation conduit is directly connected to said cylindrical chamber.
Claim 4
Dependent Claim
26 words
An improved engine exhaust gas cleaning system according to claim 1, wherein said exhaust gas recirculation conduit has its outlet tangentially connected to said cylindrical chamber.
Claim 5
Dependent Claim
31 words
An improved engine exhaust gas cleaning system according to claim 3, wherein the angle between the outlets of said mixture conduit and said exhaust gas recirculation conduit is at most 90*.
Claim 6
Dependent Claim
24 words
An improved engine exhaust gas cleaning system according to claim 3, wherein the outlet of said exhaust gas recirculation conduit has a bifurcated shape.
Claim 7
Dependent Claim
24 words
An improved engine exhaust gas cleaning system according to claim 1, wherein said exhaust gas recirculation conduit is indirectly connected to said cylindrical chamber.
Claim 8
Dependent Claim
33 words
An improved engine exhaust gas cleaning system according to claim 6, wherein said exhaust gas recirculation conduit has its outlet connected to the intake system upstream of a throttle valve of the carburetor.
Claim 9
Dependent Claim
19 words
An improved engine exhaust gas cleaning system according to claim 1, wherein the intake pipe includes an intake manifold.
Claim 10
Dependent Claim
32 words
An improved engine exhaust gas cleaning system according to claim 8, wherein said intake manifold has at least one of its trunk pipes connected to the side walls of said cylindrical chamber.
Claim 11
Dependent Claim
29 words
An improved engine exhaust gas cleaning system according to claim 1, wherein the intake pipe includes a plurality of pipes each having its inlet connected to said cylindrical chamber.
Claim 12
Dependent Claim
47 words
An improved engine exhaust gas cleaning system according to claim 1, wherein said cylindrical chamber includes a two-wall portion defining an annular chamber in which a heated fluid is passed to interchange heat with the air-fuel mixture in said cylindrical chamber to promote atomization of the fuel.
Claim 13
Dependent Claim
66 words
An improved engine exhaust gas cleaning system according to claim 1, further comprising a partition mounted in said cylindrical chamber between the outlet of said mixture conduit and the inlet of the intake pipe and formed with an aperture through which the swirled air-fuel mixture and recirculated exhaust gases are once constricted and then expanded in said cylindrical chamber so as to further promote mixing inbetween.
Claim 14
Dependent Claim
117 words
An improved engine exhaust gas cleaning system according to claim 1, further comprising richer mixture means including a second carburetor for producing an air-fuel mixture having a mixture ratio richer than the air-fuel mixture which is to be mixed with the recirculated exhaust gases, and a second intake pipe providing fluid communication between the second-named carburetor and a combustion chamber of the engine in the vicinity of a spark plug so as to supply the richer air-fuel mixture to the spark plug so that the combustion in the combustion chamber may be stably anchored in the vicinity of the spark plug although the overall mixture ratio in the combustion chamber can be maintained within a proper range.