A device for purifying exhaust gases from a combustion engine (1) is provided with a first filter (10) arranged in an exhaust conduit (7) between the engine (1) and an exhaust outlet (8) for removing particular constituents from the exhaust gases, and a recirculation conduit (11) for diverting a par
A device for purifying exhaust gases from a combustion engine (1) is provided with a first filter (10) arranged in an exhaust conduit (7) between the engine (1) and an exhaust outlet (8) for removing particular constituents from the exhaust gases, and a recirculation conduit (11) for diverting a part of the exhaust gases passing through the first filter (10) recirculating this part of the exhaust gases to the air intake (2) of the engine. A second filter (30) is arranged between the inlet end (20) of the recirculation conduit and the air intake (2) of the engine. A method for purifying exhaust gases from the combustion engine (1) and using this device to purify exhaust gas, in particular, from a diesel engine, are also provided.
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The invention claimed is: 1. A device for purifying exhaust gases from a combustion engine (1), comprising a first filter (10) arranged in an exhaust conduit ( 7) between the engine (1) and an exhaust outlet (8) for removing particulate constituents from the exhaust gases, a recirculation conduit (
The invention claimed is: 1. A device for purifying exhaust gases from a combustion engine (1), comprising a first filter (10) arranged in an exhaust conduit ( 7) between the engine (1) and an exhaust outlet (8) for removing particulate constituents from the exhaust gases, a recirculation conduit (11) branching off the exhaust conduit (7) downstream of the first filter (10) and upstream of the exhaust outlet (8) for diverting a part of the exhaust gases that have passed through said first filter (10) and recirculating this part of the exhaust gases to the air intake (2) of the engine (1), a second filter (30) arranged downstream of an inlet end (12) of the recirculation conduit (11) from the exhaust gas conduit (7) and between the inlet end (12) and air intake (2) of the engine (1), and having a lower nominal filtering grade than said first filter (10), and said exhaust conduit (7), recirculation conduit ( 11) and first and second filters (10, 30) arranged such that gas flow occurs in only one direction through said exhaust conduit (7) and first filter (10), and then through said recirculation conduit (11) and second filter (30). 2. A device according to claim 1, wherein the second filter (30) is designed with lower or essentially the same filtering efficiency as the first filter (10). 3. A device according to claim 2, wherein the second filter (30) has such a filtering efficiency that is capable of catching particulate constituents of engine-damaging nature. 4. A device according to claim 3, wherein the second filter (30) has essentially the same filtering efficiency as a conventional air filter intended for the engine (1). 5. A device according to claim 1, wherein the second filter (30) has such a filtering efficiency that is capable of catching particulate constituents of engine-damaging nature. 6. A device according to claim 5, wherein the second filter (30) has essentially the same filtering efficiency as a conventional air filter intended for the engine (1). 7. A device according to claim 1, wherein the second filter (30) is arranged in the outlet end of the recirculation conduit (11). 8. A device according to claim 1, wherein the first filter (10) comprises a catalytic material for transferring constituents in the exhaust gases into less environmentally hazardous substances. 9. A device according to claim 1, wherein the device comprises a catalyst (9) arranged in the exhaust conduit (7) . 10. A device according to claim 1, structured and arranged for purifying exhaust gases from a diesel engine. 11. A device according to claim 1, wherein the nominal filtering grade is a measure of per cent removal of particulates of a particular size. 12. A device according to claim 1, additionally comprising a cooler (13) located in said recirculation conduit (11), with said second filter (30) located downstream of said cooler (13) and within said recirculation conduit (11). 13. A device according to claim 1, additionally comprising an air inlet channel (4) coupled to the air intake ( 2) of the engine (1), a valve (14) arranged to join an outlet end of the recirculation conduit (11) with the air inlet channel (4), and an EGR-control device (15) structured and arranged to control the valve (14) to regulate ratio of fresh air suppled through the air inlet channel (4) to recirculated exhaust gases through the recirculation conduit (11). 14. A device according to claim 13, wherein the EGR-control device (15) additionally comprises a probe (16) arranged for measuring oxygen in the exhaust conduit (7), a sensor (17) arranged for measuring engine speed, and a sensor (18) arranged for detecting throttle position. 15. A device according to claim 14, additionally comprising an air cooler (6) situated in the air intake (2) , and a turbo charger (5) comprising a compressor wheel ( 5a) situated to feed air with over-pressure along the air intake (2) to the engine (1), and a turbine wheel (5 b) coupled to said compressor wheel (5a) and arranged to be rotated by the exhaust gases leaving the engine (1) along the exhaust conduit (7). 16. A device according to claim 15, additionally comprising a catalyst (9) situated upstream of said first filter (10) in said exhaust conduit (7). 17. A method for purifying exhaust gases from a combustion engine (1), comprising the steps of passing the exhaust gases in a single direction from the engine (1) through a first filter (10) arranged in an exhaust conduit (7) between the engine (1) and an exhaust outlet (8) for removing particulate constituents from the exhaust gases, diverting a part of the exhaust gases that have passed through said first filter (10) and prior to passing through said exhaust outlet (8), through a recirculation conduit (11) in a single direction to be recirculated to an air intake (2) of the engine (1), and passing the diverted part of the exhaust gases through a second filter (30) having a lower nominal filtering grade than said first filter (10) and arranged downstream of an inlet end ( 12) of the recirculation conduit (11) from the exhaust gas conduit (7) and between the inlet end (12) and air intake (2) of the engine (1). 18. A method according to claim 17, wherein the nominal filtering grade is a measure of per cent removal of particulates of a particular size. 19. A method according to claim 17, comprising the additional step of purifying exhaust gases from a diesel engine. 20. A method according to claim 17, comprising the additional step of cooling the diverted part of the exhaust gases in the recirculation conduit (11) by passing through a cooler (13) prior to passing through said second filter (30) situated within said recirculation conduit (11).
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이 특허에 인용된 특허 (9)
Berg Morris (Grand Blanc MI) Schaefer Carl F. (Flint MI) Johnston William J. (Birkdale GB2), Ceramic filters for diesel exhaust particulates and methods for making.
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