IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0752518
(2004-01-08)
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우선권정보 |
JP-2003-004965(2003-01-10) |
발명자
/ 주소 |
- Koga,Toshimasa
- Kawashima,Junichi
- Otake,Makoto
- Tsutsumoto,Naoya
- Kondou,Terunori
- Inoue,Takao
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
13 인용 특허 :
6 |
초록
▼
In regeneration apparatus and method for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine, a timing at which an accumulated particulate is combusted to regenerate the particulate filter is determined and a control is performed for a combustion of the p
In regeneration apparatus and method for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine, a timing at which an accumulated particulate is combusted to regenerate the particulate filter is determined and a control is performed for a combustion of the particulate, during the control for the combustion of the particulate, a temperature of the engine exhaust gas is raised to a first target temperature set at a temperature equal to or higher than a criterion temperature which provides a criterion of whether the particulate is combusted to regenerate the particulate filter when the engine falls in a first driving region, and the engine exhaust gas temperature is raised to a second target temperature set at a temperature lower than the criterion temperature when the engine falls in a second driving region different from the first driving region.
대표청구항
▼
What is claimed is: 1. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine, the regeneration apparatus comprising: a regeneration timing determining section that determines a timing at which an accumulated particulate is comb
What is claimed is: 1. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine, the regeneration apparatus comprising: a regeneration timing determining section that determines a timing at which an accumulated particulate is combusted to regenerate the particulate filter; and a regeneration mode controlling section that performs a control for a combustion of the particulate; the regeneration mode controlling section including: a first exhaust gas temperature raising section that raises a temperature of the engine exhaust gas to a first target temperature set at a temperature equal to or higher than a criterion temperature which provides a criterion of whether the particulate is combusted to regenerate the particulate filter when the engine falls in a first driving region; and a second exhaust gas temperature raising section that raises the engine exhaust gas temperature to a second target temperature set at a temperature lower than the criterion temperature when the engine falls in a second driving region different from the first driving region, and wherein the second target temperature is a temperature of the engine exhaust gas to combust the particulate whose quantity is approximately equal to a quantity of the particulate which flows into the particulate filter. 2. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine, the regeneration apparatus comprising: a regeneration timing determining section that determines a timing at which an accumulated particulate is combusted to regenerate the particulate filter; and a regeneration mode controlling section that performs a control for a combustion of the particulate, the regeneration mode controlling section including: a first exhaust gas temperature raising section that raises an exhaust gas temperature to a first target temperature set at a temperature to combust the particulate to decrease an accumulation quantity of the particulate in the particulate filter when the engine falls in a first driving region; and a second exhaust gas temperature raising section that raises the exhaust gas temperature to a second target temperature set at a temperature to combust the particulate whose quantity is approximately the same as a quantity of the particulate which flows into the particulate filter when the engine falls in a second driving region different from the first driving region. 3. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 2, wherein the second driving region is a driving region located at a lower vehicle speed side than the first driving region. 4. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 2, wherein the second exhaust gas temperature raising section includes: a detection section that detects an exhaust gas temperature; and an exhaust gas temperature controlling section that controls the exhaust gas temperature on the basis of the detected exhaust gas temperature and the second target temperature. 5. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 2, wherein the second exhaust gas temperature raising section raises the engine exhaust gas temperature to the second target temperature by adjusting at least one of a fuel injection timing of a main injection through each of fuel injectors to control an engine torque, another fuel injection timing of a post injection and an injection quantity of the post injection carried out by retarding the injection timing from the main injection, a turbo charged pressure of a turbo charger, an exhaust gas recirculation quantity (EGR quantity) from an exhaust passage of the engine to an intake air passage thereof, and an opening area of the intake air passage. 6. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 2, wherein the regeneration timing determining section comprises: a particulate accumulation quantity estimating section that estimates an accumulation quantity (PM) of the particulate in the particulate filter on the basis of a filter forward-and-rearward difference pressure (ΔPdf) and exhaust gas flowing quantity (Qexh); and a particulate accumulation quantity determining section that determines whether the particulate accumulation quantity is increased and reached to a prescribed quantity (PM1) and wherein the regeneration timing determining section determines the timing at which the accumulated particulate in the particulate filter is combusted to regenerate the particulate filter when the particulate accumulation quantity determining section determines that the accumulated particulate has reached to the prescribed quantity (PM1). 7. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 6, wherein the regeneration apparatus further comprises a vehicle speed detection section that detects the vehicle speed (VSP); and an engine driving region determining section that determines one of which of the first and second engine driving regions the engine falls on the basis of the vehicle speed. 8. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 7, wherein the engine is determined to fall in the second driving region including a predetermined low vehicle speed region, the regeneration controlling section sets a device controlled variable increment/decrement value (dCONTb) during a balance control region which corresponds to the predetermined low vehicle speed region for at least one regeneration mode controlled device of the engine to obtain the exhaust gas temperature at which the particulate whose quantity is approximately the same as the quantity of the particulate which flows into the particulate filter is enabled to be combusted. 9. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 2, wherein the second exhaust gas temperature raising section comprises: a balance control region controlled variable increment/decrement value setting section that sets a device controlled variable increment/decrement value (dCONTb) of at least one controlled device during the engine balance control region to obtain the second target temperature in accordance with the engine driving state when the engine falls in the second driving region including the balance control region; an exhaust gas temperature detecting section that detects an exhaust gas temperature (Texhin) at an inlet portion of the particulate filter; a feedback correction coefficient setting section that sets a feedback correction coefficient (Kfb) in accordance with a difference between the exhaust gas temperature (Texhin) and the second target temperature (tTexh); and a controlled variable increment/decrement value correcting section that corrects the controlled variable increment/decrement value (dCONTb) with the feedback correction coefficient (Kfb). 10. A regeneration apparatus for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine as claimed in claim 9, wherein the correction coefficient (Kfb) is one when the difference between the exhaust gas temperature (Texhin) and the second target temperature is zero and as the difference becomes larger, the feedback correction coefficient (Kib) becomes larger. 11. A regeneration method for a particulate filter that collects a particulate in exhaust gas of an internal combustion engine, the regeneration method comprising: determining a timing at which an accumulated particulate is combusted to regenerate the particulate filter; and performing a control for a combustion of the particulate, the performing of the control of the combustion of the particulate including: raising an exhaust gas temperature to a first target temperature set at a temperature to combust the particulate to decrease an accumulation quantity of the particulate in the particulate filter when the engine falls in a first driving region; and raising the exhaust gas temperature to a second target temperature set at a temperature to combust the particulate whose quantity is approximately the same as a quantity of the particulate which flows into the particulate filter when the engine falls in a second driving region different from the first driving region. 12. An exhaust gas purifying device for an internal combustion engine, comprising: a particulate filter, disposed within an exhaust passage of the engine, to collect a particulate in exhaust gas of the engine; and a regeneration apparatus to regenerate the particulate filter, the regeneration apparatus comprising: a regeneration timing determining section that determines a timing at which an accumulated particulate is combusted to regenerate the particulate filter; and a regeneration mode controlling section that performs a control for a combustion of the particulate, the regeneration mode controlling section including: a first exhaust gas temperature raising section that raises a temperature of the engine exhaust gas to a first target temperature set at a temperature equal to or higher than a criterion temperature which provides a criterion of whether the particulate is combusted to regenerate the particulate filter when the engine falls in a first driving region; and a second exhaust gas temperature raising section that raises the engine exhaust gas temperature to a second target temperature set at a temperature lower than the criterion temperature when the engine falls in a second driving region different from the first driving region, and wherein the second target temperature is a temperature at which the particulate whose quantity is approximately the same as a quantity of the particulate which flows into the particulate filter is combusted. 13. An exhaust gas purifying device for an internal combustion engine, comprising: a particulate filter, disposed within an exhaust passage of the engine, to collect a particulate in exhaust gas of the engine; and a regeneration apparatus to regenerate the particulate filter, the regeneration apparatus comprising: a first exhaust gas temperature raising section that raises an exhaust gas temperature to a first target temperature set at. a temperature to combust the particulate to decrease an accumulation quantity of the particulate in the particulate filter when the engine falls in a first driving region; and a second exhaust gas temperature raising section that raises the exhaust gas temperature to a second target temperature set at a temperature to combust the particulate whose quantity is approximately the same as a quantity of the particulate which flows into the particulate filter when the engine falls in a second driving region different from the first driving region. 14. An exhaust gas purifying device for an internal combustion engine as claimed in claim 13, wherein the second driving region is a driving region of the engine located at a lower vehicle speed side than the first driving region. 15. An exhaust gas purifying device for an internal combustion engine as claimed in claim 13, wherein the exhaust gas temperature raising section includes: a detection section that detects an exhaust gas temperature; and an exhaust gas temperature controlling section that controls the exhaust gas temperature on the basis of the detected exhaust gas temperature and the second target temperature. 16. An exhaust gas purifying device for an internal combustion engine as claimed in claim 13, wherein the second exhaust gas temperature raising section raises the engine exhaust gas temperature to the second target temperature by adjusting at least one of a fuel injection timing of a main injection through each of fuel injectors to control an engine torque, another fuel injection timing of a post injection and an injection quantity of the post injection, the post injection being carried out by retarding the injection timing from the main injection, a turbo charged pressure of a turbo charger, an exhaust gas recirculation quantity from an exhaust passage of the engine to an intake air passage thereof, and an opening area of the intake air passage.
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