WO2006016543A1 - 排気浄化装置の制御方法 - Google Patents
排気浄化装置の制御方法 Download PDFInfo
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- WO2006016543A1 WO2006016543A1 PCT/JP2005/014499 JP2005014499W WO2006016543A1 WO 2006016543 A1 WO2006016543 A1 WO 2006016543A1 JP 2005014499 W JP2005014499 W JP 2005014499W WO 2006016543 A1 WO2006016543 A1 WO 2006016543A1
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- WIPO (PCT)
- Prior art keywords
- temperature
- reducing agent
- catalyst
- reduction catalyst
- amount
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0406—Methods of control or diagnosing using a model with a division of the catalyst or filter in several cells
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a method for controlling an exhaust purification device for reducing and purifying NOx in exhaust gas.
- a diesel engine has been equipped with a selective reduction catalyst having a property of selectively reacting NOx with a reducing agent even in the presence of oxygen in the middle of an exhaust pipe through which exhaust gas flows.
- a necessary amount of reducing agent is added upstream of the reducing catalyst, and the reducing agent is reacted with NOx (nitrogen oxide) in the exhaust gas on the selective reducing catalyst, thereby reducing the NO X emission concentration.
- NOx nitrogen oxide
- Patent Document 1 In the case of automobiles, it is difficult to ensure safety when driving with ammonia itself, and in recent years, the use of non-toxic urea water as a reducing agent has been studied. (For example, Patent Document 1).
- Patent Document 1 JP 2002-161732 A
- urea water is added to the exhaust gas upstream of the selective catalytic reduction catalyst, the urea water is decomposed into ammonia and carbon dioxide under a temperature condition of about 170 to 180 ° C or higher.
- the NOx in the exhaust gas is reduced and purified well by ammonia on the reductive catalyst.
- the actual catalyst temperature may not reach the detected temperature, and the outlet temperature of the selective catalytic reduction catalyst is controlled.
- the actual catalyst temperature may already be higher than the detected temperature, so the injection amount of urea water is controlled too early or too late, and the NOx reduction performance is sufficient. There was a fear of being unable to withdraw.
- the present invention has been made in view of the above circumstances, and it is possible to appropriately control the injection amount of a reducing agent such as urea water so that the NOx reduction rate can be maintained high.
- a reducing agent such as urea water
- the present invention is equipped with a selective reduction catalyst in the middle of an exhaust pipe, and a reducing agent is added to the upstream side of the selective reduction catalyst by a reducing agent addition means to reduce and purify NOx.
- the exhaust purifier control method detects an exhaust temperature upstream from the selective catalytic reduction catalyst, and subdivides the selective catalytic reduction catalyst using a model of a first-order lag response to the detected temperature. Estimate the temperature in multiple cell units, add the cell volume for each temperature zone based on the estimated temperature in this cell unit, and divide the total cell volume by the total catalyst volume for each temperature zone.
- the distribution volume ratio is calculated, and the temperature distribution volume ratio is calculated with respect to the reference injection amount of the reducing agent determined in light of the current engine operating condition on the assumption that the catalyst temperature is uniformly in each temperature range. Multiply by temperature range and calculated for each temperature range These values are added together to obtain an instruction injection amount of the reducing agent to the reducing agent adding means.
- the temperature of the selective catalytic reduction catalyst installed in the middle of the exhaust pipe changes following the temperature of the exhaust gas from the engine, so the exhaust temperature upstream of the selective catalytic reduction catalyst.
- the response of the temperature change on the selective catalytic reduction catalyst side can be expressed as a model of the first-order lag response using mathematical formulas, but the temperature on the selective catalytic reduction catalyst side cannot be expressed as a uniform one. It must be taken into account that there is a temperature distribution in the flow direction of the exhaust gas.
- the temperature of a plurality of division points of the selective catalytic reduction catalyst is estimated using the first-order lag response model, and the estimated temperature of each division point is appropriately interpolated, etc. If the selective reduction catalyst is assigned to a plurality of subdivided cell units, the catalyst temperature is estimated for each cell unit, and furthermore, for each of a plurality of temperature zones based on the estimated temperature for each cell unit. The temperature distribution volume ratio is determined by adding the cell volume and dividing the total cell volume by the total catalyst volume for each temperature zone.
- FIG. 1 is a schematic view showing one embodiment of the present invention.
- FIG. 2 is a perspective view showing the selective catalytic reduction catalyst of FIG. 1 with a part cut away.
- FIG. 3 is a flowchart showing a specific control procedure of the control device of FIG. 1.
- FIGS. 1 to 3 show an embodiment of the present invention.
- Reference numeral 1 in FIG. 1 denotes an engine that is a diesel engine, and the engine 1 shown here is provided with a turbocharger 2.
- the air 4 guided from the air cleaner 3 is sent to the compressor 2a of the turbocharger 2 through the intake pipe 5, and the air 4 pressurized by the compressor 2a is further sent to the intercooler 6 to be cooled, From the intercooler 6, air 4 is guided to an unillustrated internal hold and is introduced into each cylinder of the engine 1.
- the exhaust gas 7 from which each cylinder force of the engine 1 is also exhausted is sent to the turbine 2b of the turbocharger 2 through the exhaust motor hold 8, and the exhaust gas 7 driving the turbine 2b is transmitted. Is discharged through the exhaust pipe 9 to the outside of the vehicle.
- a selective catalytic reduction catalyst 10 is embraced by a casing 11 and this selective catalytic reduction catalyst 10 is shown in FIG. NOx is selectively formed even in the presence of oxygen. It has the property that it can be reacted with ammonia.
- a urea water injection valve 13 with an injection nozzle 12 is installed on the upstream side of the casing 11, and a urea water supply line 15 connects between the urea water injection valve 13 and a urea water tank 14 provided at a required location.
- the urea water 17 (reducing agent) in the urea water tank 14 is driven through the urea water injection valve 13 by the drive of a supply pump 16 installed in the middle of the urea water supply line 15.
- the urea water injection valve 13, the urea water tank 14, the urea water supply line 15, and the supply pump 16 constitute a urea water addition means 18 (reducing agent addition means). Speak.
- the engine 1 is equipped with a rotation sensor 19 for detecting the engine rotation speed, and a rotation speed signal 19a from the rotation sensor 19 and an accelerator sensor 20 (detecting the depression angle of the accelerator pedal).
- the load signal 20a from the sensor) is input to the control device 21 that forms the engine control computer (ECU Electronic Control Unit).
- a temperature sensor 22 for detecting the exhaust gas temperature is disposed at the inlet of the casing 11 holding the selective catalytic reduction catalyst 10, and the detection signal 22a of the temperature sensor 22 is also controlled by the control. It can be input to the control device 21! (This temperature sensor 22 can be provided at the outlet of the exhaust motor 8 to detect the engine outlet temperature).
- the amount of NOx generated is estimated based on the rotational speed signal 19 a from the rotation sensor 19, the load signal 20 a from the accelerator sensor 20, and the current operating state in which the force is also determined. Then, the base injection amount of the urea water 17 corresponding to the estimated NOx generation amount is calculated, and the temperature correction as described in detail below is performed on the base injection amount based on the detection signal 22a of the temperature sensor 22. Thus, the final commanded injection amount of the urea water 17 is calculated, and the commanded injection amount of the urea water 17 is directed toward the urea water adding means 18.
- FIG. 3 shows a specific control procedure in the control device 21.
- steps S1 to S3 a model of a first-order lag response to the exhaust temperature at the inlet of the selective catalytic reduction catalyst 10 is used.
- a method of estimating the predicted catalyst temperature at a plurality of division points of the selective catalytic reduction catalyst 10 is employed.
- the temperature of the selective catalytic reduction catalyst 10 installed in the middle of the exhaust pipe 9 changes following the temperature of the exhaust gas 7 as much as the power of the engine.
- the response of the temperature change on the selective catalytic reduction catalyst 10 side when the exhaust gas temperature on the side is input can be expressed as a model of a first-order lag response by a mathematical formula. For example, it can be expressed as Equation 1 below. (The model shown here is a discrete model, but it may be a continuous model).
- Temperature change (z) (Catalyst inlet temperature Catalyst temperature) Z (Time constant z Heat dissipation proportional coefficient)
- the catalyst prediction is performed by setting a plurality of division points such as three locations in the radial direction of the inlet portion of the selective catalytic reduction catalyst 10, two locations in the radial direction of the intermediate portion, and three locations in the radial direction of the outlet portion. Estimate the temperature.
- catalyst inlet temperature is a detected temperature measured by temperature sensor 22
- Catalyst temperature is a previous estimated value
- time constant and "heat dissipation proportional coefficient” are measured by current temperature sensor 22.
- the time constant and the heat dissipation proportional coefficient at the division point are also read out in the first step S1 for multiple division points set for the selective catalytic reduction catalyst 10. Becoming! /
- the exhaust flow rate required together with the current measured value of the temperature sensor 22 is used by the control device 21 for engine control. It should be estimated based on the known air flow value and the fuel injection command value to each cylinder.
- step S 2 the time constant and the heat dissipation proportional coefficient obtained in the previous step S 1, the catalyst inlet temperature determined from the current measured value of the temperature sensor 22, the controller 21 In
- the first-order lag response model using the previous catalyst temperature value is used to determine the temperature change at each division point.
- step S3 the temperature change at each dividing point obtained in step S2 is added to the estimated value of the previous catalyst temperature at each dividing point (the same as that used in step S2). Thus, the predicted catalyst temperature at each division point is calculated.
- step S4 mainly based on the previous command injection amount of the urea water 17! /, The endothermic amount of the cooling action due to the addition of the urea water 17 and the exothermic amount of the NOx purification reaction.
- the temperature is corrected by taking the minutes into account.
- the water contained in the urea water 17 adheres to the selective catalytic reduction catalyst 10 and exerts a cooling action, thereby causing endotherm, and the ammonia generated from the urea water 17 and NOx in the exhaust gas are reduced. Since heat is generated by reacting on the selective catalytic reduction catalyst 10, the endothermic amount and the amount of heat generated are corrected.
- the predicted catalyst temperature at each division point corrected in this way is interpolated (interpolated) using a quadratic equation or the like in the next step S5, thereby further reducing the selective catalytic reduction catalyst 10.
- the estimated temperature at the subdivided midpoint is estimated.
- the estimated temperatures of a large number of data points obtained in the previous step S5 are assigned to a plurality of cell units obtained by subdividing the selective catalytic reduction catalyst 10. As a result, selection is performed. The catalyst temperature is estimated for each cell unit of the reduced catalyst 10.
- step S7 a plurality of temperature zones are based on the estimated temperature in cell units.
- the cell volume is summed for each (for example, about 10 ° C increments), and in the next step S8, the summed cell volume is divided by the total catalyst volume for each temperature zone.
- the temperature distribution volume ratio is determined, and it is possible to accurately grasp what percentage of the area of ° C occupied in the selective catalytic reduction catalyst 10!
- step S9 the urea water 17 standard determined in light of the current operating state of the engine 1 on the assumption that the catalyst temperature is uniformly in the temperature zone for each temperature zone.
- the injection amount is calculated, and in the next step S10, the reference injection amount calculated for each temperature zone is multiplied by the temperature distribution volume ratio for each temperature zone, and the values calculated for each temperature zone are added together.
- the urea water addition means 18 outputs the urea water 17 as an indicated injection amount. It is powered.
- the reference injection amount of urea water 17 calculated in the previous step S9 is the NOx generation amount estimated based on the current operating state. This refers to an injection amount that is temperature-corrected according to the reaction rate when it is assumed that the catalyst temperature is uniformly in the relevant temperature range.
- the exhaust purification device is controlled by such a control device 21, the exhaust temperature at the inlet of the selective catalytic reduction catalyst 10 is detected, and a model of a first-order lag response to the detected temperature is used.
- the temperature can be estimated in units of a plurality of cells obtained by subdividing the selective catalytic reduction catalyst 10, and the cell volumes are added up for each of a plurality of temperature zones based on the estimated temperatures in the units of cells, and the sum is obtained.
- the temperature distribution volume ratio it is possible to determine the temperature distribution volume ratio.
- the temperature distribution volume ratio is multiplied by the temperature distribution volume ratio by the temperature distribution volume ratio for the reference injection amount of urea water 17 for each temperature band, and the temperature
- the temperature By adding the values calculated for each band to obtain the commanded injection amount of the urea water 17 to the urea water adding means 18, there is no excess or deficiency corresponding to the volume ratio of each temperature range of the selective catalytic reduction catalyst 10.
- the injection of urea water 17 is realized.
- the urea water 17 can be injected without excess or deficiency according to the volume ratio of each selective reduction catalyst 10 for each temperature zone.
- Appropriate control of the injection quantity of 17 can maximize the NOx reduction performance of the selective catalytic reduction catalyst 10 and maintain a high NOx reduction rate, and can also avoid excessive injection of urea water 17 Therefore, the consumption of the urea water 17 can be suppressed to the minimum necessary, and the possibility that the excess urea water 17 may be discharged through the selective catalytic reduction catalyst 10 while remaining unreacted can be avoided. be able to.
- the temperature in units of a plurality of cells when the temperature is estimated in units of a plurality of cells, temperature correction is performed in consideration of the endothermic amount of the cooling action due to the addition of urea water 17 and the exothermic amount of the NOx purification reaction.
- the temperature in units of cells can be estimated with higher accuracy and, as a result, the commanded injection amount of the urea water 17 can be controlled more accurately.
- the volume of the temperature distribution in the control method of the exhaust gas purification apparatus of the present invention can be used, for example, when fuel is added to the upstream side of the particulate filter carrying the oxidation catalyst and the particulate filter is forcibly regenerated.
- the fuel injection amount is switched based on the fact that the volume ratio of the area above the predetermined temperature in the particulate filter is equal to or higher than the predetermined ratio, or the volume ratio of the high temperature area is higher than the predetermined ratio. Sometimes it is possible to suppress the addition of fuel.
- control method of the exhaust gas purification apparatus of the present invention is not limited to the above-described embodiment, and as a reducing agent added to the selective catalytic reduction catalyst, light oil or the like is adopted in addition to urea water. It is also possible to develop a predictive control for avoiding abnormalities by executing temperature estimation several cycles ahead using a model of the first-order lag response. In determining the injection amount, it is possible to correct the reference injection amount by estimating the amount of reducing agent already adsorbed on the selective catalytic reduction catalyst, and within the range without departing from the gist of the present invention. Of course, various changes can be obtained.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05768538A EP1801374A4 (en) | 2004-08-09 | 2005-08-08 | METHOD FOR CONTROLLING AN EXHAUST GAS CLEANING DEVICE |
US11/573,067 US7572637B2 (en) | 2004-08-09 | 2005-08-08 | Method for controlling exhaust emission control device |
CN2005800269572A CN101002007B (zh) | 2004-08-09 | 2005-08-08 | 排气净化装置的控制方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004232164A JP4267536B2 (ja) | 2004-08-09 | 2004-08-09 | 排気浄化装置の制御方法 |
JP2004-232164 | 2004-08-09 |
Publications (1)
Publication Number | Publication Date |
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WO2006016543A1 true WO2006016543A1 (ja) | 2006-02-16 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/014499 WO2006016543A1 (ja) | 2004-08-09 | 2005-08-08 | 排気浄化装置の制御方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7572637B2 (ja) |
EP (1) | EP1801374A4 (ja) |
JP (1) | JP4267536B2 (ja) |
KR (1) | KR20070050940A (ja) |
CN (1) | CN101002007B (ja) |
WO (1) | WO2006016543A1 (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4501877B2 (ja) * | 2006-03-14 | 2010-07-14 | 株式会社デンソー | 内燃機関の制御装置 |
JP2009127500A (ja) * | 2007-11-22 | 2009-06-11 | Hino Motors Ltd | 排気浄化装置 |
JP5553582B2 (ja) * | 2009-11-25 | 2014-07-16 | 日野自動車株式会社 | エンジンの排ガス浄化装置 |
WO2011118095A1 (ja) * | 2010-03-25 | 2011-09-29 | Udトラックス株式会社 | エンジンの排気浄化装置及びエンジンの排気浄化方法 |
JP5655349B2 (ja) * | 2010-03-31 | 2015-01-21 | いすゞ自動車株式会社 | 内燃機関の排気浄化制御システム |
AT507865A2 (de) * | 2010-05-04 | 2010-08-15 | Avl List Gmbh | Verfahren zum betreiben einer brennkraftmaschine |
JP5091988B2 (ja) * | 2010-08-02 | 2012-12-05 | 本田技研工業株式会社 | 内燃機関の排気浄化システム |
CN102207015B (zh) * | 2011-05-20 | 2015-02-25 | 潍柴动力股份有限公司 | 一种scr催化器的温度预测装置和方法 |
CN102230413B (zh) * | 2011-05-20 | 2013-06-12 | 潍柴动力股份有限公司 | 一种scr控制装置、系统和方法 |
CN103696838B (zh) * | 2013-12-03 | 2016-03-16 | 潍柴动力股份有限公司 | 一种scr上游温度控制方法及装置 |
FR3023318B1 (fr) | 2014-07-07 | 2016-07-22 | Peugeot Citroen Automobiles Sa | Procede de limitation d'un encrassement d'un mixeur. |
DE102017010825A1 (de) * | 2017-11-23 | 2019-05-23 | Daimler Ag | Verfahren zum Betreiben einer Abgasanlage, insbesondere eines Kraftfahrzeugs |
KR101967467B1 (ko) * | 2017-12-14 | 2019-04-09 | 현대오트론 주식회사 | 배기가스 정화용 촉매 손상 방지를 위한 물분사 인젝터 제어방법 및 이에 의해 운용되는 엔진 |
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- 2005-08-08 KR KR1020077004937A patent/KR20070050940A/ko not_active Application Discontinuation
- 2005-08-08 WO PCT/JP2005/014499 patent/WO2006016543A1/ja active Application Filing
- 2005-08-08 US US11/573,067 patent/US7572637B2/en not_active Expired - Fee Related
- 2005-08-08 EP EP05768538A patent/EP1801374A4/en not_active Withdrawn
- 2005-08-08 CN CN2005800269572A patent/CN101002007B/zh not_active Expired - Fee Related
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JPH0783073A (ja) * | 1993-09-13 | 1995-03-28 | Hitachi Ltd | ガスタービン設備の起動計画作成装置 |
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Also Published As
Publication number | Publication date |
---|---|
EP1801374A4 (en) | 2008-01-16 |
JP4267536B2 (ja) | 2009-05-27 |
JP2006046289A (ja) | 2006-02-16 |
EP1801374A1 (en) | 2007-06-27 |
US20070217984A1 (en) | 2007-09-20 |
US7572637B2 (en) | 2009-08-11 |
CN101002007B (zh) | 2011-07-27 |
CN101002007A (zh) | 2007-07-18 |
KR20070050940A (ko) | 2007-05-16 |
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