초록 ▼

The invention relates to a device for purifying exhaust gases from a combustion engine (1), comprising an arrangement (30) for recirculating exhaust gases from the engine to an air intake (2) thereof, a valve device (12) controlled by a control device (13) for regulating the relation between fresh a

The invention relates to a device for purifying exhaust gases from a combustion engine (1), comprising an arrangement (30) for recirculating exhaust gases from the engine to an air intake (2) thereof, a valve device (12) controlled by a control device (13) for regulating the relation between fresh air and recirculated exhaust gases supplied to the engine, and a regenerable filter (8) adapted to catch particulate constituents of the exhaust gases. The device further comprises means (14) for recording the temperature of the exhaust gases from the engine. The control device (13) is adapted to be supplied with temperature information from said temperature recording means (14), the control device (13) being adapted, with the aid of this temperature information and the valve device (12), to regulate the relation between fresh air and recirculated exhaust gases supplied to the engine so as to achieve a composition of the exhaust gases from the engine that is favourable with respect to the regeneration of the filter (8).

대표청구항 ▼

The invention claimed is: 1. A device for purifying exhaust gases from a combustion engine (1), comprising an arrangement (30) for recirculating exhaust gases from the engine to an air intake (2) thereof, a valve device (12) controlled by a control device (13) for regulating the relation between fr

The invention claimed is: 1. A device for purifying exhaust gases from a combustion engine (1), comprising an arrangement (30) for recirculating exhaust gases from the engine to an air intake (2) thereof, a valve device (12) controlled by a control device (13) for regulating the relation between fresh air and recirculated exhaust gases supplied to the engine, a regenerable filter (8) adapted to catch particulate constituents of the exhaust gases, and means (14) for recording the temperature of the exhaust gases from the engine, the control device (13) being adapted to be supplied with temperature information from said temperature recording means (14), wherein the control device (13) is adapted, with the aid of said temperature information and the valve device (12), to regulate the relation between fresh air and recirculated exhaust gases supplied to the engine to achieve a relation between NOx and soot of the exhaust gases from the engine that is favorable for regeneration of the filter (8). 2. A device according to claim 1, wherein the control device (13) is adapted, with the aid of said temperature information and the valve device (12), to regulate the relation between fresh air and recirculated exhaust gases supplied to the engine so that regeneration of the filter (8) will take place at prevailing temperature level of the exhaust gases. 3. A device according to claim 1, comprising means (7) for converting NO occurring in the exhaust gases into NO2. 4. A device according to claim 3, wherein said converting means comprises a catalyst (7) for converting NO into NO2, which is arranged upstream of the filter (8). 5. A device according to claim 3, wherein said converting means comprises a catalytic material for converting NO into NO2, which material is integrated in the filter (8). 6. A device according to claim 1, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted. 7. A method for regulating the relationship between supplied fresh air and recirculated exhaust gases of the combustion engine (1) which, comprises an arrangement (30) for recirculating exhaust gases from the engine to an air intake (2) thereof, a valve device (12) controlled by a control device (13) for regulating the relation between fresh air and recirculated exhaust gases supplied to the engine, and a regenerable filter (8) adapted to catch particulate constituents of the exhaust gases, the temperature of the exhaust gases from the engine being recorded and the control device (13) being supplied with information regarding said temperature, wherein the control device (13), with the aid of said temperature information and the valve device (12), regulates the relation between fresh air and recirculated exhaust gases supplied to the engine to achieve a relation between NOx and soot of the exhaust gases from the engine that is favorable for regeneration of the filter (8). 8. A method according to claim 7, wherein the control device (13), with the aid of said temperature information and the valve device (12), regulates the relation between fresh air and recirculated exhaust gases supplied to the engine so that a regeneration of the filter (8) will take place at the prevailing temperature level of the exhaust gases. 9. Use of a device according to claim 1 for purifying exhaust gases from a diesel engine. 10. A device according to claim 2, comprising means (7) for converting NO occurring in the exhaust gases into NO2. 11. A device according to claim 10, wherein said converting means comprises a catalyst (7) for converting NO into NO2, which is arranged upstream of the filter (8). 12. A device according to claim 11, wherein said converting means comprises a catalytic material for converting NO into NO2, which material is integrated in the filter (8). 13. A device according to claim 4, wherein said converting means comprises a catalytic material for converting NO into NO2, which material is integrated in the filter (8). 14. A device according to claim 2, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted. 15. A device according to claim 3, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted. 16. A device according to claim 4, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted. 17. A device according to claim 5, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted. 18. A device according to claim 10, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted. 19. A device according to claim 11, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted. 20. A device according to claim 12, wherein the filter (8) comprises a catalytic material for lowering the temperature at which particulate constituents deposited in the filter are ignited and combusted.