IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
UP-0980681
(2004-11-03)
|
| 등록번호 |
US-7770385
(2010-08-30)
|
| 우선권정보 |
GB-0327332.4(2003-11-25) |
|
발명자
/ 주소 |
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
0 인용 특허 :
61 |
초록
An internal combustion engine exhaust system 10 comprises an exhaust gas recirculation pipe 22 which, in use, recirculates engine exhaust gas into the engine air intake. A particulate filter 18 is provided and a burner arrangement 36 is arranged to burn off particulates caught by the filter.
대표청구항
▼
The invention claimed is: 1. An internal combustion engine exhaust system comprising a particulate filter through which substantially all engine exhaust gas from an internal combustion engine is directed, an exhaust gas recirculation path which recirculates engine exhaust gas from a point in the ex
The invention claimed is: 1. An internal combustion engine exhaust system comprising a particulate filter through which substantially all engine exhaust gas from an internal combustion engine is directed, an exhaust gas recirculation path which recirculates engine exhaust gas from a point in the exhaust system downstream of the particulate filter into an engine air intake, and a fuel-fired burner to effect regeneration of the particulate filter while the particulate filter is filtering the engine exhaust gas. 2. An internal combustion engine exhaust system according to claim 1 in which there is provided a trigger mechanism arranged to trigger regeneration of the filter by activation of the burner. 3. An internal combustion engine exhaust system according to claim 2 in which the trigger mechanism senses the back pressure in the exhaust system. 4. An internal combustion engine system according to claim 2 in which the trigger mechanism is a timer that ignites the burner after a predetermined period of engine operation. 5. An internal combustion engine exhaust system according to claim 2 in which the trigger mechanism senses a combination of two or more of exhaust back pressure, time elapsed since last burn, mass of particulates retained by filter and particular engine operating characteristics. 6. An internal combustion engine exhaust system according to claim 1 in which the internal combustion engine exhaust system comprises a controller which controls both the burner operation and the exhaust gas recirculation. 7. An internal combustion engine exhaust system according to claim 1 in which the exhaust gas recirculation path includes a cooling mechanism arranged in the exhaust gas recirculation path. 8. An internal combustion engine exhaust system according to claim 1 in which the exhaust gas recirculation is effected by the provision of an exhaust gas recirculation valve in the air intake path of the engine. 9. An internal combustion engine exhaust system according to claim 7 in which the cooling mechanism arranged in the exhaust gas recirculation path is arranged to provide additional cooling during operation of the burner. 10. An internal combustion engine exhaust system according to claim 8 in which the exhaust gas recirculation valve is closed to prevent exhaust gas recirculation during operation of the burner. 11. A method of operating an internal combustion engine exhaust system comprising the steps of directing substantially all exhaust gas from an internal combustion engine through a particulate filter, operating the particulate filter to filter particulates from the exhaust gas, recirculating the exhaust gas from a point in the exhaust system downstream of the particulate filter into an engine air intake, and periodically regenerating the particulate filter with a fuel-fired burner while the particulate filter is filtering the engine exhaust gas. 12. A method of operating an internal combustion engine exhaust system according to claim 11 in which the step of periodically regenerating the particulate filter comprises effecting regeneration in response to a trigger, the trigger including one or more of the back pressure in the exhaust, the time elapsed since the last regeneration, other engine parameters indicative of particular engine operating conditions. 13. A method of operating an internal combustion engine exhaust system according to claim 11 in which the step of recirculating the exhaust gas includes cooling the recirculated exhaust gas. 14. A method of operating an internal combustion engine exhaust system according to claim 13 in which the method includes the step of providing additional cooling to the recirculated exhaust gas on operation of the burner to regenerate the filter. 15. An internal combustion engine exhaust system according to claim 7 in which the exhaust gas recirculation is effected by the provision of an exhaust gas recirculation valve in the air intake path of the engine. 16. An internal combustion engine exhaust system having an exhaust gas recirculation path which recirculates engine exhaust gas from a point in the exhaust system downstream of the particulate filter into the engine air intake, a cooling mechanism arranged in the exhaust gas recirculation path, a particulate filter and a fuel-fired burner to effect regeneration of the particulate filter. 17. An internal combustion engine exhaust system according to claim 16 in which the cooling mechanism arranged in the exhaust gas recirculation path is arranged to provide additional cooling during operation of the burner. 18. A method of operating an internal combustion engine exhaust system comprising the steps of providing a particulate filter, operating the particulate filter to filter particulates from the exhaust gas stream, providing a cooling mechanism arranged in an exhaust gas recirculation path, recirculating exhaust gas from a point in the exhaust system downstream of the particulate filter along the exhaust gas recirculation path into the engine air intake and periodically regenerating the particulate filter with a fuel-fired burner. 19. The method of claim 18 in which the exhaust gas recirculation is effected by the provision of an exhaust gas recirculation valve in the air intake path of the engine. 20. An internal combustion engine exhaust system comprising a particulate filter through which substantially all exhaust gas from an internal combustion engine is directed, an exhaust gas recirculation path which recirculates engine exhaust from a point in the exhaust system downstream of the particulate filter into an engine air intake, and a fuel-fired burner to effect regeneration of the particulate filter. 21. The internal combustion engine exhaust system of claim 1 further comprising a cooling mechanism arranged in the exhaust gas recirculation path. 22. The internal combustion engine exhaust system of claim 1 further comprising a cooling mechanism arranged in the exhaust gas recirculation path. 23. The internal combustion engine exhaust system of claim 20 further comprising a cooling mechanism in the exhaust gas recirculation path. 24. The internal combustion engine exhaust system of claim 1 further comprising a turbo charger turbine. 25. The internal combustion engine exhaust system of claim 16 further comprising a turbo charger engine. 26. The internal combustion engine exhaust system of claim 20 further comprising a turbo charger engine. 27. The internal combustion engine exhaust system of claim 21 further comprising a turbo charger engine. 28. The internal combustion engine exhaust system of claim 16, wherein the particulate filter includes a filter housing having a single exhaust inlet, a single exhaust outlet, and a filter positioned within the filter housing such that all exhaust gases from an engine enters the exhaust inlet, goes through the filter, and exits the exhaust outlet, and wherein the burner effects regeneration of the particulate filter while the particulate filter is filtering the engine exhaust gas. 29. The internal combustion engine exhaust system of claim 20, wherein the burner effects regeneration of the particulate filter while the particulate filter is filtering the engine exhaust gas. 30. The internal combustion engine exhaust system of claim 16 wherein substantially all of the engine exhaust gas is directed through the particulate filter. 31. The method of claim 18 further comprising the steps of directing substantially all the exhaust gas through the particulate filter by providing the particulate filter with a filter housing having a single exhaust inlet, a single exhaust outlet, and a filter positioned within the filter housing such that all exhaust gases from an internal combustion engine enters the exhaust inlet, goes through the filter, and exits the exhaust outlet, and including positioning a burner of the fuel-fired burner in the filter housing upstream of the filter with the single exhaust inlet being positioned axially between the burner and the filter such that the burner effects regeneration of the particulate filter while the particulate filter is filtering the engine exhaust gas. 32. The internal combustion engine exhaust system according to claim 1 including a sensor immediately upstream of the particulate filter to measure back pressure of the particulate filter, and wherein operation of the fuel-fired burner is initiated when the back pressure exceeds a predetermined limit. 33. The internal combustion engine exhaust system according to claim 1 including a fuel line that directly supplies fuel to the fuel-fired burner, an air line that supplies air directly to the fuel-fired burner to mix with the fuel to provide combustion air, and an ignition device that ignites the combustion air to ignite the fuel-fired burner. 34. The internal combustion engine exhaust system of claim 20 including a sensor immediately upstream of the particulate filter to measure back pressure of the particulate filter, and wherein operation of the fuel-fired burner is initiated when the back pressure exceeds a predetermined limit. 35. The internal combustion engine exhaust system of claim 20 including a fuel line that directly supplies fuel to the fuel-fired burner, an air line that supplies air directly to the fuel-fired burner to mix with the fuel to provide combustion air, and an ignition device that ignites the combustion air to ignite the fuel-fired burner. 36. The internal combustion engine exhaust system according to claim 33 wherein the particulate filter comprises a filter housing having a single exhaust inlet, a single exhaust outlet, and a filter positioned within the filter housing such that all exhaust gases from an engine enters the exhaust inlet, goes through the filter, and exits the exhaust outlet, and wherein the fuel-fired burner includes a burner positioned within the filter housing upstream of the filter. 37. The internal combustion engine exhaust system according to claim 36 wherein the single exhaust inlet is positioned axially between the burner and the filter. 38. A method of operating an internal combustion engine exhaust system according to claim 11 including providing the particulate filter with a filter housing having a single exhaust inlet, a single exhaust outlet, and a filter positioned within the filter housing such that all exhaust gases from an internal combustion engine enters the exhaust inlet, goes through the filter, and exits the exhaust outlet, and including positioning a burner of the fuel-fired burner in the filter housing upstream of the filter with the single exhaust inlet being positioned axially between the burner and the filter. 39. The internal combustion engine exhaust system of claim 20 wherein the particulate filter includes a filter housing having a single exhaust inlet, a single exhaust outlet, and a filter positioned within the filter housing such that all exhaust gases from the internal combustion engine enters the exhaust inlet, goes through the filter, and exits the exhaust outlet, and wherein the fuel-fired burner includes a burner positioned within the filter housing upstream of the filter with the single exhaust inlet being positioned axially between the burner and the filter such that the burner effects regeneration of the particulate filter while the particulate filter is filtering the engine exhaust gas.
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