IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0171105
(2005-06-29)
|
등록번호 |
US-7546728
(2009-07-01)
|
우선권정보 |
DE-10 2004 031 624(2004-06-30) |
발명자
/ 주소 |
- Ripper, Wolfgang
- Wickert, Stefan
- Schaller, Johannes
- Lueders, Hartmut
- Walz, Christian
- Mayer, Thorsten
- Schernewski, Ralf
- Loehr, Matthias
- Schmeling, Ulf Peter
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
14 |
초록
▼
A method for operating a catalytic converter used for purifying the exhaust gas of an internal combustion engine, and a device for implementing the method, which provide for an open-loop or closed-loop control of the reagent fill level in the catalytic converter to a predefined storage setpoint valu
A method for operating a catalytic converter used for purifying the exhaust gas of an internal combustion engine, and a device for implementing the method, which provide for an open-loop or closed-loop control of the reagent fill level in the catalytic converter to a predefined storage setpoint value. The targeted stipulation of the storage setpoint value ensures, on one hand, that in non-stationary states of the internal combustion engine, there is a sufficient quantity of reagent available for the completest possible removal of at least one unwanted exhaust-gas component, and on the other hand, a reagent slip is avoided.
대표청구항
▼
What is claimed is: 1. A method for operating a catalytic converter used for purifying exhaust gas of an internal combustion engine, the method comprising: introducing into an exhaust duct, upstream of the catalytic converter, a reagent needed in the catalytic converter; controlling a reagent fill
What is claimed is: 1. A method for operating a catalytic converter used for purifying exhaust gas of an internal combustion engine, the method comprising: introducing into an exhaust duct, upstream of the catalytic converter, a reagent needed in the catalytic converter; controlling a reagent fill level of the catalytic converter to a predefined storage setpoint value, wherein the predefined storage setpoint value is adjusted by a control element as a function of a measure for a temperature of the catalytic converter; below an operating-temperature range of the catalytic converter toward lower temperatures, continuously reducing the temperature-dependent storage setpoint value by the control element; and after a maximum lying within an operating-temperature range of the catalytic converter toward higher temperatures, reducing the temperature-dependent storage setpoint value by the control element. 2. The method according to claim 1, further comprising ascertaining a storage actual value reflecting the reagent fill level at least on the basis of a reagent flow streaming in. 3. The method according to claim 1, further comprising calculating a storage actual value reflecting the reagent fill level from a time integral of a reagent flow passing into the catalytic converter, reduced by a difference between an NOx mass flow, which is related to the reagent, that flows into the catalytic converter and that leaves the catalytic converter, reduced further by a reagent slip. 4. The method according to claim 1, further comprising ascertaining a storage actual value reflecting the reagent fill level of the catalytic converter at least on the basis of an NOx mass flow, which is related to the reagent, that flows into the catalytic converter. 5. The method according to claim 4, further comprising ascertaining the NOx mass flow, which is related to the reagent, that flows into the catalytic converter, at least on the basis of operating parameters of the internal combustion engine which include at least one of a load status of the internal combustion engine, an engine speed and an air signal provided by an air sensor disposed in an intake region of the internal combustion engine. 6. The method according to claim 1, further comprising ascertaining a storage actual value reflecting the reagent fill level at least on the basis of an NOx mass flow, which is related to the reagent, that leaves the catalytic converter. 7. The method according to claim 6, further comprising ascertaining the NOx mass flow, which is related to the reagent, that leaves the catalytic converter, on the basis of a catalytic-converter efficiency, and wherein, to ascertain the catalytic-converter efficiency, at least one of (a) at least one measure for a temperature of the catalytic converter, (b) a storage actual value reflecting the reagent fill level of the catalytic converter, (c) an exhaust-gas velocity and (d) a feed ratio, which indicates a ratio between a reagent flow that streams in and the NOx mass flow, which is related to the reagent, that streams in, is taken into account. 8. A device for operating a catalytic converter used for purifying exhaust gas of an internal combustion engine, the device comprising: means for introducing into an exhaust duct, upstream of the catalytic converter, a reagent needed in the catalytic converter; means for controlling a reagent fill level of the catalytic converter to a predefined storage setpoint value, wherein the predefined storage setpoint value is adjusted by a setpoint control element as a function of a measure for a temperature of the catalytic converter; wherein the setpoint control element continuously reduces, below an operating-temperature range of the catalytic converter toward lower temperatures, the temperature-dependent storage setpoint value; and wherein the setpoint control element reduces, after a maximum lying within an operating-temperature range of the catalytic converter toward higher temperatures, the temperature-dependent storage setpoint value.
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