IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0375154
(2003-02-28)
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우선권정보 |
JP-0095884 (2002-03-29) |
발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
12 인용 특허 :
6 |
초록
▼
An exhaust gas purifying method for an internal combustion engine, including determining an amount of particulates in an exhaust gas which is accumulated in a particulate filter disposed within an exhaust passage of the engine, determining whether the particulate filter is at an adequate state for r
An exhaust gas purifying method for an internal combustion engine, including determining an amount of particulates in an exhaust gas which is accumulated in a particulate filter disposed within an exhaust passage of the engine, determining whether the particulate filter is at an adequate state for regeneration, and executing regeneration of the particulate filter by controlling oxygen concentration in the exhaust gas depending on the amount of the trapped particulates when it is determined that the particulate filter is at the adequate state and the amount of the accumulated particulates exceeds a first preset value. An exhaust gas purifying apparatus corresponding to the method.
대표청구항
▼
1. A method for purifying exhaust gas passing through a particulate filter disposed in an exhaust passage in an internal combustion engine, the method comprising:determining an amount of particulates in the exhaust gas which is trapped and accumulated in the particulate filter; determining whether t
1. A method for purifying exhaust gas passing through a particulate filter disposed in an exhaust passage in an internal combustion engine, the method comprising:determining an amount of particulates in the exhaust gas which is trapped and accumulated in the particulate filter; determining whether the particulate filter is at an adequate state for regeneration; and executing regeneration of the particulate filter by controlling oxygen concentration in the exhaust gas depending on the amount of the accumulated particulates when it is determined that the particulate filter is at the adequate state and the amount of the accumulated particulates exceeds a first preset value wherein when the amount of the trapped particulates exceeds a second preset value larger than the first preset value, the executing operation comprises reducing the oxygen concentration in the exhaust gas to a first value smaller than a second value obtained upon the regeneration being unexecuted, wherein when the amount of the accumulated particulates exceeds a third preset value larger than the second preset value, the executing operation comprises reducing the oxygen concentration in the exhaust gas to a third value smaller than a fourth value obtained when the amount of the accumulated particulates is between the second preset value and the third preset value, regardless of whether the particulate filter is at the adequate state for regeneration. 2. The method as claimed in claim 1, wherein as the amount of the accumulated particulates increases, the oxygen concentration in the exhaust gas is reduced to a smaller value.3. The method as claimed in claim 1, wherein the executing operation comprises increasing the oxygen concentration in the exhaust gas as the amount of the accumulated particulates is reduced during execution of the regeneration.4. The method as claimed in claim 1, wherein the particulate filter has an oxidation ability oxidizing an exhaust component flowing thereinto, the adequate state determination operation determines that the particulate filter is at the adequate state for regeneration when the oxidation ability is activated.5. The method as claimed in claim 4, wherein the adequate state determination operation determines that the particulate filter is at the adequate state for regeneration when the oxidation ability is activated to oxidize a heavy hydrocarbon component present in the exhaust gas.6. The method as claimed in claim 1, wherein the first preset value is a value at which an amount of the accumulated particulates is combustible when the regeneration of the particulate filter is executed.7. The method as claimed in claim 1, wherein the second preset value is a value at which a temperature of the particulate filter exceeds an allowable upper limit when the regeneration of the particulate filter is executed at a maximum oxygen concentration in the exhaust gas flowing into the particulate filter.8. The method as claimed in claim 1, wherein the third preset value is a value at which the engine is undesirably influenced in drivability by an exhaust gas pressure upstream of the particulate filter.9. The method as claimed in claim 1, wherein the executing operation controls the oxygen concentration in the exhaust gas by controlling an excess air ratio.10. The method as claimed in claim 1, wherein the particulate amount determining operation comprises predicting the amount of the accumulated particulates on the basis of an exhaust gas pressure upstream of the particulate filter.11. An apparatus for purifying exhaust gas in an exhaust passage in an internal combustion engine, the apparatus comprising:a plurality of sensors detecting parameters relative to an operating condition; a particulate filter operative to trap and accumulate particulates present in exhaust gas flowing thereinto, to particulate filter being disposed in the exhaust passage; and a controller programmed to determine an amount of the particulates accumulated by the particulate filter using the parameter detected by the sensors, to determine whether the particulate filter is at an adequate state for regeneration, to execute regeneration of the particulate filter by controlling oxygen concentration in the exhaust gas depending on the amount of the accumulated particulates when it is determined that the particulate filter is at the adequate state and the amount of the accumulated particulates exceeds a first preset value, and, to reduce the oxygen concentration in the exhaust gas to a smaller value as the amount of the accumulated particulates increases. 12. An apparatus for purifying gas in an exhaust passage in an internal combustion engine, the apparatus comprising:a plurality of sensors detecting parameters relative to an engine operating condition; a particulate filter operative to trap and accumulate particulates present in exhaust gas flowing thereinto, the particulate filter being disposed in the exhaust passage; and a controller programmed to determine an amount of the particulates accumulated by the particulate filter using the parameters detected by the sensors, to determine whether the particulate filter is at an adequate state for regeneration, to execute regeneration of the particulate filter by controlling oxygen concentration in the exhaust gas depending on the amount of the accumulated particulates when it is determined that the particulate filter is a the adequate state and the amount of the accumulated particulates exceeds a first preset value, and, to reduce the oxygen concentration in the exhaust gas to a first value smaller than a second value obtained upon the regeneration being unexecuted, when the amount of the accumulated particulates exceeds a second preset value larger than the first preset value. 13. An apparatus for purifying exhaust gas in an exhaust passage in an internal combustion engine, the apparatus comprising:a plurality of sensors detecting parameters relative to an engine operating condition; a particulate filter operative to trap and accumulate particulates present in exhaust gas flowing thereinto, the particulate filter being disposed in the exhaust passage; and a controller programmed to determine an amount of the particulates accumulated by the particulate filter using the parameters detected by the sensors, to determine whether the particulate filter is at an adequate state for regeneration, and to execute regeneration of the particulate filter by controlling oxygen concentration in the exhaust gas depending on the amount of the accumulated particulates when it is determined that the particulate filter is at the adequate state and the amount of the accumulated particulates exceeds a first preset value, wherein the controller is programmed to reduce the oxygen concentration in the exhaust gas to a first value smaller than a second value obtained upon the regeneration being unexecuted when the amount of the accumulated particulates exceeds a second preset value larger than the first preset value, wherein the controller is programmed to reduce the oxygen concentration in the exhaust gas to a third value smaller than a fourth value obtained when the amount of the accumulated particulates is between the second preset value and a third preset value, regardless of whether the particulate filter is at the adequate state for regeneration, when the amount of the accumulated particulates exceeds the third preset value larger than the second preset value. 14. The apparatus as claimed in claim 13, wherein the particulate filter has an oxidation ability oxidizing an exhaust component flowing thereinto, and the controller is programmed to determine that the particulate filter is at the adequate state for regeneration when the oxidation ability is activated.15. The apparatus as claimed in claim 14, wherein the controller is programmed to determine that the particulate filter is at the adequate state for regeneration when the oxidation ability is activated to oxidize a heavy hydrocarbon component present in the exhaust gas.16. The apparatus as claimed in claim 13, wherein the first preset value is a value at which an amount of the accumulated particulates is combustible when the regeneration of the particulate filter is executed.17. The apparatus as claimed in claim 13, wherein the third preset value is a value at which the engine is undesirably influenced in drivability by an exhaust gas pressure upstream of the particulate filter.18. The apparatus as claimed in claim 13, wherein the controller is programmed to control the oxygen concentration in the exhaust gas by controlling an excess air ratio.19. The apparatus as claimed in claim 13, wherein the controller is programmed to predict the amount of the accumulated particulates on the basis of an exhaust pressure upstream of the particulate filter.20. The apparatus as claimed in claim 13, wherein the second preset value is a value at which a temperature of the particulate filter exceeds an allowable upper limit when the regeneration of the particulate filter is executed at a maximum oxygen concentration in the exhaust gas flowing into the particulate filter.21. The apparatus as claimed in claim 12, wherein the second preset value is a value at which a temperature of the particulate filter exceeds an allowable upper limit when the regeneration of the particulate filter is executed at a maximum oxygen concentration in the exhaust gas flowing into the particulate filter.22. An apparatus for purifying exhaust gas in an exhaust passage in an internal combustion engine, the apparatus comprising:plurality of sensors detecting parameters relative to an engine operating condition; a particulate filter operative to trap and accumulate particulates present in exhaust gas flowing thereinto, the particulate filter being disposed in the exhaust passage; and a controller programmed to determine an amount of the particulates accumulated by the particulate filter using the parameters detected by the sensors, to determine whether the particulate filter is at an adequate state for regeneration, to execute regeneration of the particulate filter by controlling oxygen concentration in the exhaust gas depending on the amount of the accumulated particulates when it is determined that the particulate filter is at the adequate state and the amount of the accumulated particulates exceeds a first present value, and to increase the oxygen concentration in the exhaust gas as the amount of the accumulated particulates is reduced during execution of the regeneration. 23. An article of manufacture comprising:a computer storage medium having a computer executable program code, the code for purifying exhaust gas passing through a particulate filter disposed in an exhaust passage in an internal combustion engine, the code comprising: code to determine an amount of the particulates present in the exhaust gas which is trapped and accumulated by the particulate filter; code to determine whether the particulate filter is at an adequate state for regeneration; and code to execute regeneration of the particulate filter by controlling oxygen concentration in the exhaust gas depending on the amount of the accumulated particulates when it is determined that the particulate filter is at the adequate state and the amount of the accumulated particulates exceeds a first preset value wherein when the amount of the accumulated particulates exceeds a second preset value larger than the first preset value, the code to execute regeneration reduces the oxygen concentration in the exhaust gas to a first value smaller than a second value obtained upon the regeneration being unexecuted, wherein when the amount of the accumulated particulates exceeds a third preset value larger than the second preset value, the code to execute regeneration reduces the oxygen concentration in the exhaust gas to a third value smaller than a fourth value obtained when the amount of the accumulated particulates is between the second preset value and the third preset value, regardless of whether the particulate filter is at the adequate state for regeneration. 24. The article as claimed in claim 23, wherein the code to execute regeneration reduces the oxygen concentration in the exhaust as to a smaller value as the amount of the accumulated particulates increases.25. The article as claimed in claim 23, wherein the code to execute regeneration increases the oxygen concentration in the exhaust gas as the amount of the accumulated particulates is reduced during execution of the regeneration.26. The article as claimed in claim 23, wherein the particulate filter has an oxidation ability oxidizing an exhaust component flowing thereinto, the code to determine the adequate state determines that the particulate filter is at the adequate state for regeneration when the oxidation ability is activated.27. The article as claimed in claim 26, wherein the code to determine the adequate state determines that the particulate filter is at the adequate state for regeneration when the oxidation ability is activated to oxidize a heavy hydrocarbon component present in the exhaust gas.28. The article as claimed in claim 23, wherein the first preset value is a value at which an amount of the accumulated particulates is combustible when the regeneration of the particulate filter is executed.29. The article as claimed in claim 23, wherein the second preset value is a value at which a temperature of the particulate filter exceeds an allowable upper limit when the regeneration of the particulate filter is executed at a maximum oxygen concentration in the exhaust gas flowing into the particulate filter.30. The article as claimed in claim 23, wherein the third preset value is a value at which the engine is undesirably influenced in drivability by an exhaust gas pressure upstream of the particulate filter.31. The article as claimed in claim 23, wherein the code to execute regeneration controls the oxygen concentration in the exhaust gas by controlling an excess air ratio.32. The article as claimed in claim 23, wherein the code to determine the amount of the accumulated particulates predicts the amount of the accumulated particulates on the basis of an exhaust pressure upstream of the particulate filter.
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