WO2012127973A1 - 粒子状物質堆積量推定装置、排気ガス浄化システム、および粒子状物質堆積量推定方法 - Google Patents
粒子状物質堆積量推定装置、排気ガス浄化システム、および粒子状物質堆積量推定方法 Download PDFInfo
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- WO2012127973A1 WO2012127973A1 PCT/JP2012/054455 JP2012054455W WO2012127973A1 WO 2012127973 A1 WO2012127973 A1 WO 2012127973A1 JP 2012054455 W JP2012054455 W JP 2012054455W WO 2012127973 A1 WO2012127973 A1 WO 2012127973A1
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- particulate matter
- deposition amount
- coefficient
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- amount
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/448—Auxiliary equipment or operation thereof controlling filtration by temperature measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/80—Chemical processes for the removal of the retained particles, e.g. by burning
- B01D46/84—Chemical processes for the removal of the retained particles, e.g. by burning by heating only
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/029—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles by adding non-fuel substances to 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration
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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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
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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
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure 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
- 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
- F01N2900/0601—Parameters used for exhaust control or diagnosing being estimated
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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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
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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
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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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
- F01N3/103—Oxidation catalysts for HC and CO only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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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
- Y02T10/40—Engine management systems
Definitions
- the particulate matter deposition amount is used to estimate the PM deposition amount in the DPF when performing regeneration processing of the DPF (Diesel Particulate Filter) for removing particulate matter (PM: Particulate Matter) contained in the exhaust gas of the engine
- the present invention relates to an estimation device, an exhaust gas purification system using the same, and a particulate matter deposition amount estimation method.
- a DPF is provided in an exhaust pipe to reduce PM contained in exhaust gas.
- the DPF collects PM such as soot contained in the exhaust gas, and discharges the exhaust gas in which the PM is reduced to the outside air. Since the filter function is reduced when the amount of PM collected by the DPF is increased, the DPF performs regeneration for burning the collected PM.
- This regeneration includes natural regeneration in which the deposited PM spontaneously burns when the temperature of the exhaust gas is high, and forced regeneration performed when the amount of deposited PM exceeds a predetermined reference value.
- PM is forcedly controlled by adjusting the operating state of the engine so as to increase the exhaust temperature, and further performing external dosing that injects the fuel in the front stage of the DPF or internal dosing that injects the fuel into the engine cylinder.
- the forced regeneration further includes automatic forced regeneration and manual forced regeneration. If the PM deposition amount is greater than the reference value when automatic forced regeneration is performed and the DPF may be blocked, a warning is issued to the driver to perform manual forced regeneration. .
- Patent Document 1 discloses a PM emission model in which PM emission is set according to the operating state of the engine, and a PM regeneration model in which PM regeneration is set by the temperature difference between the outlet temperature and the inlet temperature of the DPF.
- the DPF differential pressure model in which the PM deposition amount is set from the exhaust gas flow rate and the differential pressure of the DPF, and is determined according to the engine speed and the fuel injection amount of the engine as the difference between the PM emission amount and the PM regeneration amount.
- a DPF deposition amount estimating device is described which calculates the PM deposition estimation amount of the DPF by adding the PM deposition amount correction amount obtained by correcting the estimated value of the DPF differential pressure model using the coefficient K.
- the time change of PM generation is calculated using the above, and the time change of PM purification is calculated using the PM purification prediction model formula of the mathematical model for calculating the PM purification, and the time of these PM generation is calculated.
- An exhaust gas purification system is described which estimates the PM accumulation amount of the DPF from the change amount, the time change amount of the PM purification amount, and the collection rate of the DPF.
- PM101 collected in the cell constituting the DPF is uniformly deposited in the cell, but when the amount of PM 101 increases, as shown in the lower part of FIG. It has been confirmed that the deposited PM 101 may peel off in some places, and the peeled PM 102 may cause cell clogging.
- the present invention has been made in view of the above, and it is an apparatus for estimating the amount of deposited particulate matter that can estimate the amount of deposited PM with high accuracy, an exhaust gas purification system using the same, and the estimated amount of deposited particulate matter Intended to provide a method.
- a particulate matter deposition amount estimation apparatus comprises an inlet side and an outlet side of a particulate matter removal filter for removing particulate matter from exhaust gas of an engine.
- a differential pressure deposition amount calculation unit for calculating the differential pressure deposition amount by estimating the particulate matter deposition amount deposited on the particulate matter removal filter based on the differential pressure of the exhaust gas and the exhaust gas flow rate;
- the amount of particulate matter deposited on the particulate matter removal filter was estimated using a model that subtracts the amount of particulate matter burning in the particulate matter removal filter from the amount of particulate matter in the exhaust gas that is input Under the condition that the sum of the first coefficient and the second coefficient becomes a constant value, the model deposition amount calculating unit calculating the model deposition amount, the differential pressure change ratio calculating unit calculating the temporal change rate of the differential pressure deposition amount, and , Said differential pressure bank When the sum of the value obtained by multiplying the amount by the first
- the particulate matter deposition amount calculation unit sets a sum of the first coefficient and the second coefficient to 1, and the exhaust gas.
- the value of the first coefficient is set to 1
- the value of the first coefficient is set to 0.
- the particulate matter deposition amount calculation unit determines that the exhaust gas flow rate exceeds the predetermined value and the time change of the differential pressure deposition amount When the rate is equal to or more than a predetermined threshold value, the set first coefficient is decreased according to an increase in the time change rate of the differential pressure deposition amount.
- the particulate matter deposition amount calculation unit calculates the particulate matter removal filter when the calculated particulate matter deposition amount exceeds a threshold value. And outputting an instruction to perform manual forced regeneration for.
- An exhaust gas purification system comprises a particulate matter removal filter for removing particulate matter from exhaust gas of an engine, and an engine control unit for controlling the engine.
- a regeneration control unit that controls regeneration of the particulate matter removal filter, a differential pressure sensor that detects a differential pressure between the inlet side and the outlet side of the particulate matter removal filter, and manual forced regeneration of the particulate matter removal filter
- the regeneration control unit is configured to instruct the regeneration control unit to deposit the particulate matter deposition amount on the particulate matter removal filter based on the differential pressure and the exhaust gas flow rate input from the engine control unit.
- a particulate matter to be burned by the particulate matter removal filter from the particulate matter mass in the exhaust gas input to the particulate matter removal filter which calculates a differential pressure deposition amount estimating the Model deposition amount calculation unit for calculating a model deposition amount that estimates the particulate matter deposition amount deposited on the particulate matter removal filter using a model that subtracts an amount; temporal change of the differential pressure deposition amount
- the differential pressure deposition amount is multiplied by the first coefficient under the condition that the differential pressure change rate calculation unit that calculates the sum of the first coefficient and the second coefficient becomes a constant value, and the model deposition amount is second When the exhaust gas flow rate exceeds a predetermined value when calculating the addition value with the value multiplied by the coefficient as the particulate matter deposition amount, the value of the first coefficient is set larger than the value of the second coefficient If the exhaust gas flow rate exceeds the predetermined value and the temporal change rate of the differential pressure deposition amount is equal to or greater than a predetermined threshold, the particulate
- the regeneration control unit when the regeneration control unit receives an instruction of manual forced regeneration execution from the regeneration instructing unit, the manual forced regeneration is performed via the engine control unit. It is characterized by carrying out.
- the differential pressure between the inlet side and the outlet side of the particulate matter removal filter for removing particulate matter from exhaust gas of an engine and the exhaust gas flow rate are used.
- the differential pressure deposition amount step for calculating the differential pressure deposition amount that estimates the particulate matter deposition amount deposited on the particulate matter removal filter, and the particulate matter mass in the exhaust gas input to the particulate matter removal filter Calculating a model accumulation amount by estimating the amount of accumulation of particulate matter accumulated on the particulate matter removal filter using a model for subtracting the amount of particulate matter burned by the particulate matter removal filter;
- the differential pressure deposition amount is multiplied by the first coefficient under the condition that the sum of the first coefficient and the second coefficient becomes a constant value, and the differential pressure change ratio calculating step of calculating the temporal change ratio of the differential pressure deposition amount When the sum of the value obtained by multiplying the second model by the second model is calculated as the second model, if the exhaust
- the set first coefficient is decreased. And calculating the amount of accumulated particulate matter in the amount of accumulated particulate matter.
- the present invention under the condition that the sum of the first coefficient and the second coefficient becomes a constant value, a value obtained by multiplying the differential pressure deposition amount by the first coefficient and a value obtained by multiplying the model deposition amount by the second coefficient
- the addition value is calculated as the particulate matter deposition amount
- the value of the first coefficient is set larger than the value of the second coefficient
- the exhaust gas flow rate is If the time constant of the differential pressure deposition amount is greater than or equal to the predetermined threshold value, the particulate matter deposition amount is calculated by reducing the set first coefficient. High particulate matter deposition can be estimated.
- FIG. 1 is a schematic view showing a schematic configuration of a diesel engine including an exhaust gas purification system according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of the reproduction control unit shown in FIG.
- FIG. 3 is a view showing the relationship between the exhaust gas flow rate and the differential pressure with the amount of PM deposition as a parameter.
- FIG. 4 is a block diagram showing a detailed configuration of the model deposition amount calculation unit.
- FIG. 5 is a flowchart showing the procedure of the PM deposition amount calculation process performed by the PM deposition amount calculation unit.
- FIG. 6 is a flow chart showing the procedure of the coefficient determination process shown in FIG.
- FIG. 7 is a view showing the exhaust gas flow rate dependency of the coefficient ⁇ .
- FIG. 1 is a schematic view showing a schematic configuration of a diesel engine including an exhaust gas purification system according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of the reproduction control unit shown in FIG.
- FIG. 3 is
- FIG. 8 is a view showing a range to which the differential pressure deposition amount calculation is mainly applied.
- FIG. 9 is a time chart showing temporal changes in PM deposition amount, differential pressure, and differential pressure deposition amount time change rate in the case where differential pressure rapid increase occurs due to cell clogging of the DPF.
- FIG. 10 is a diagram showing an example of the function of decreasing the coefficient ⁇ ′ as the rate of change in pressure accumulation amount increases with time.
- FIG. 11 is a view showing an example in which the coefficient ⁇ is modulated in the vicinity of the exhaust gas flow rate threshold.
- FIG. 12 is a diagram showing an example in which both the differential pressure deposition amount and the model deposition amount are always used in calculating the PM deposition amount.
- FIG. 13 is a diagram showing a state in which a PDF cell is blocked.
- FIG. 1 is a schematic view showing a schematic configuration of a diesel engine 100 including an exhaust gas purification system according to an embodiment of the present invention.
- a diesel engine 100 filters an intake air using a filter and an engine main body 1 in which a plurality of combustion chambers are formed, and prevents foreign matter such as dust from mixing in the combustion chamber.
- An air cleaner 2 an air supply line 3 for supplying air to each combustion chamber in the engine body 1, an exhaust line 4 for discharging exhaust gas discharged from each combustion chamber in the engine body 1, a cooling mechanism 5 ,
- An air supply manifold 3A is attached between the engine body 1 and the air supply line 3 so that the air supply from the air supply line 3 is distributed to the combustion chambers in the engine body 1.
- An exhaust manifold 4A is attached between the engine body 1 and the exhaust pipe 4 so that exhaust gases exhausted from the combustion chambers in the engine body 1 collectively flow into the exhaust pipe 4.
- the air supply line 3 is provided with an aftercooler 11 for cooling the air compressed by the exhaust turbine supercharger 6.
- the cooling mechanism 5 includes a pump 12 driven by a not-shown crankshaft or the like housed in the engine body 2.
- the cooling water pressure-fed by the pump 12 is cooled by a radiator 13 provided in the cooling mechanism 5 after the engine main body 1, the exhaust turbine supercharger 6, the oil cooler, etc. not shown are cooled. It is supposed to be.
- the cooling action of the aftercooler 11 and the radiator 13 is promoted by a fan 14 provided on the engine body 1 and rotationally driven by a crankshaft or the like (not shown).
- the exhaust turbine turbocharger 6 is supplied to a turbine 21 provided in the middle of the exhaust pipeline 4 and a compressor 22 provided on the middle of the air supply pipeline 3 and driven by being connected to the turbine 21 and the turbine 21. And a variable turbo nozzle 23 to control the flow rate of the exhaust gas.
- the exhaust turbine turbocharger 6 controls the rotation speed of the turbine 21 by controlling the opening degree of the variable turbo nozzle 23.
- the compressor 22 is driven by the rotation of the turbine 21 to charge the engine main body 1 with charge air. When the variable turbo nozzle 23 is fully closed, the variable turbo nozzle 23 is exhausted toward the exhaust gas purification device 7 via the bypass passage 24.
- variable turbo nozzle 23 when the variable turbo nozzle 23 is open, the exhaust gas is supplied to the turbine impeller 21a to perform work, and when the variable turbo nozzle 23 is fully closed, the exhaust gas is sent to the exhaust gas purification device 7 via the bypass passage 24 The exhaust temperature is raised by reducing the work to the turbine impeller 21a by outputting.
- the exhaust purification device 2 is provided downstream of the turbine 21 to remove PM contained in the exhaust gas, and has a DOC (diesel oxidation catalyst) 71, a DPF 72, a differential pressure sensor 73, and a temperature sensor 74.
- the DOC 71 and the DPF 72 are provided inside the cylindrical exhaust pipe, the DOC 71 is provided on the upstream side of the exhaust pipe, and the DPF 72 is provided on the downstream side of the exhaust pipe.
- a dosing nozzle 70a for injecting dosing fuel supplied from the dosing fuel supply device 70 is disposed between the turbine 21 and the exhaust gas purification device 7, a dosing nozzle 70a for injecting dosing fuel supplied from the dosing fuel supply device 70 is disposed. The injection of dosing fuel is performed when forced regeneration is instructed.
- the DOC 71 is realized by Pt or the like, and oxidizes and removes CO (carbon monoxide), HC (hydrocarbon) contained in the exhaust gas, and SOF (organic soluble component) contained in PM. Furthermore, the DOC 21 oxidizes NO (nitrogen monoxide) contained in the exhaust gas to NO 2 (nitrogen dioxide), and further oxidizes the dosing fuel injected from the dosing nozzle 70 a to thereby reduce the exhaust gas temperature. Raise it.
- the DPF 72 collects PM.
- the DPF 72 is realized using silicon carbide or the like as a base material.
- PM contained in the exhaust gas is collected when passing through the fine holes formed in the DPF 72.
- cells having fine flow paths along the flow direction of the exhaust gas are densely arranged in a cylindrical exhaust pipeline.
- a wall flow type DPF is formed by alternately arranging cells in which the upstream end is plugged and cells in which the downstream end is plugged.
- the collected PM will be oxidized (burned) by the oxygen contained in the exhaust gas and the NO 2 generated by DOC 71, provided that the temperature is such that the exhaust gas can proceed with the oxidation reaction. .
- the differential pressure sensor 73 is disposed upstream of the DPF 72 and detects a pressure upstream of the DPF 72, and pressure sensor 73b disposed downstream of the DPF 72 and detects pressure downstream of the DPF 72; And a differential pressure detection unit 73c that outputs a differential pressure obtained by subtracting the pressure detected by the pressure sensor 73b from the pressure detected by the pressure sensor 73a to the regeneration control unit 40.
- the temperature sensor 74 is disposed upstream of the DPF 72, detects the exhaust temperature at the inlet of the DPF 72, and outputs the detected exhaust temperature to the regeneration control unit 40 as the DPF temperature.
- the exhaust gas recirculation system 8 includes an exhaust gas recirculation passage 31 communicating the exhaust manifold 4A with the air supply conduit 3.
- the exhaust gas recirculation passage 31 extracts a part of the exhaust gas from the exhaust manifold 4A and recirculates the exhaust gas to the air supply line 3.
- the exhaust gas recirculation passage 31 is provided with an EGR valve 32 for opening and closing the exhaust gas recirculation passage 31 and an EGR cooler 33 for cooling the exhaust gas from the exhaust manifold 4A.
- the exhaust gas recirculation system 8 reduces the concentration of oxygen in the charge air and reduces the combustion temperature of the engine main body 1 by recirculating a part of the exhaust gas to the charge manifold 3A via the exhaust gas recirculation passage 31. Thus, the amount of nitrogen oxide contained in the exhaust gas can be reduced.
- the diesel engine 100 includes, as a control system, an engine rotational speed sensor 3a, an air supply pressure sensor 3c, an exhaust pressure sensor 3d, a turbine rotational speed sensor 3e, and a flow rate sensor 3f.
- the engine rotational speed sensor 3 a detects the rotational speed of a crankshaft (not shown) of the engine body 1 and inputs a signal indicating the rotational speed of the crankshaft (not shown) to the engine controller 30.
- the air supply pressure sensor 3 c detects the air supply pressure between the outlet passage of the compressor 22 and the air supply manifold 3 A, and inputs the air supply pressure to the engine controller 30.
- the exhaust pressure sensor 3 d detects the exhaust pressure between the exhaust manifold 4 A and the inlet passage of the turbine 21, and inputs a signal indicating the exhaust pressure to the engine controller 30.
- the turbine rotational speed sensor 4 e detects the rotational speed of the turbine 21 and inputs a signal indicating the rotational speed of the turbine 21 to the engine controller 30.
- the regeneration control unit 40 includes a differential pressure deposition amount calculation unit 41, a model deposition amount calculation unit 42, a differential pressure deposition amount time change rate calculation unit 43, and a PM deposition amount calculation unit 44.
- the regeneration control unit 40 is based on exhaust gas flow rate information obtained from the engine controller 30, PM generation amount information, PM combustion amount information, differential pressure obtained from the differential pressure sensor 73, and DPF temperature obtained from the temperature sensor 74.
- the PM deposition amount deposited on the DPF 72 is estimated, and when the PM deposition amount exceeds a predetermined threshold value, the regeneration instruction unit 50 is notified.
- the regeneration control unit 40 causes the engine controller 30 to perform manual forced regeneration. Also, when the manual forced regeneration ends, the control unit 50 notifies that effect to the reproduction instruction unit 50.
- the reproduction instructing unit 50 is provided on a display panel provided near the driver's seat and capable of input / output operations, and when notified by the reproduction control unit 40, displays a warning prompting a manual reproduction instruction and also performs a manual reproduction instruction.
- a manual regeneration instruction is output to the regeneration control unit 40.
- the regeneration instruction unit 50 displays and outputs that effect.
- FIG. 2 is a block diagram showing a detailed configuration of the reproduction control unit 40.
- the differential pressure deposition amount calculation unit 41 receives the differential pressure of the DPF 72 from the differential pressure sensor 73, the DPF temperature from the temperature sensor 74, and the exhaust gas flow rate information from the engine controller 30.
- the exhaust gas flow rate information is the exhaust gas volume flow rate input to the DPF 72.
- the engine controller 30 outputs a mass flow rate obtained by adding the supplied air mass flow rate detected by the flow rate sensor 3 f and the exhaust mass flow rate estimated from the fuel injection amount detected by the fuel injection amount sensor 3 b to the differential pressure deposition amount calculation unit 41 Do.
- the differential pressure deposition amount calculation unit 41 converts the exhaust gas flow rate input from the engine controller 30 into an exhaust volume flow rate based on the DPF temperature input from the temperature sensor 74.
- the differential pressure deposition amount calculation unit 41 has a three-dimensional map indicating the relationship between the converted exhaust gas flow rate, the differential pressure, and the PM deposition amount, and PM deposition using the converted exhaust gas flow rate and differential pressure as input values Output the quantity.
- FIG. 3 is a view showing the relationship between the exhaust gas flow rate and the differential pressure with the amount of PM deposition as a parameter.
- the PM deposition amount increases as the differential pressure increases.
- the differential pressure is constant, the PM deposition amount decreases as the exhaust gas flow rate increases. For example, as shown in FIG. 3, when the exhaust gas flow rate is QV1 and the differential pressure is DP1 to DP4, the PM deposition amount is P1 to P4, respectively.
- the differential pressure deposition amount calculation unit 41 outputs the estimated PM deposition amount as the differential pressure deposition amount PMa to the PM deposition amount calculation unit 44 and the differential pressure deposition amount time change rate calculation unit 43.
- the model accumulation amount calculation unit 42 receives the PM generation amount information and the PM combustion amount information from the engine controller 30, and the DPF temperature from the temperature sensor 74.
- the engine controller 30 outputs PM generation amount information indicating the PM generation amount in the exhaust gas estimated based on the fuel injection amount, the air fuel ratio, etc., the NO 2 generation amount estimated to be output from the DOC 71, and the DOC 71
- the PM deposition amount information indicating the O 2 generation amount is output to the model deposition amount calculation unit 42.
- the model accumulation amount calculation unit 42 uses a combustion model M that estimates the PM accumulation amount by subtracting the PM combustion amount burned in the DPF 72 from the PM generation amount generated from the engine.
- the combustion model M calculates the PM deposition rate.
- PM combustion amount calculating unit 42a by the NO 2 is oxidized on the basis of and the DPF temperature NO 2 generation amount input from an engine controller 30, PM deposited on the DPF72 which has been determined by actually measured or the like by NO 2 ( The PM burning rate by NO 2 is calculated using the reaction rate to be burned stored in a map or the like.
- PM combustion amount calculating section 42b by the O 2 is oxidized on the basis of the O 2 generation amount input and a DPF temperature from an engine controller 30, PM deposited on the DPF72 which has been determined by actually measured or the like by O 2 ( The PM burning rate by O 2 is calculated using the reaction rate to be burned stored in a map or the like.
- the PM generation amount input from the engine controller 3 is the PM generation rate
- the calculator 42c calculates the PM deposition rate obtained by subtracting the PM combustion rate by NO 2 and the PM combustion rate by O 2 from the PM generation rate. It outputs to the integrating part 42d.
- the integration unit 42d integrates the PM deposition amount based on the input PM deposition rate, and outputs the integrated PM deposition amount as a model deposition amount PMb to the PM integrated amount calculation unit 44.
- the PM deposition amount calculation unit 44 applies a weighting factor to the differential pressure deposition amount PMa input from the differential pressure deposition amount calculation unit 41 and the model deposition amount PMb input from the model deposition amount calculation unit 42.
- the PM accumulation amount PMs is calculated by That is, the PM deposition amount PMs can be expressed by the following equation (1) as a coefficient ⁇ (0 ⁇ ⁇ ⁇ 1).
- PMs ⁇ ⁇ PMa + (1- ⁇ ) ⁇ PMb (1) That is, the coefficient ⁇ , which is a weighting coefficient applied to the differential pressure deposition amount PMa, and the coefficient (1 ⁇ ), which is a weighting coefficient applied to the model deposition amount PMb, are respectively added to be “1”.
- the distribution ratio between the differential pressure deposition amount PMa and the model deposition amount PMb is determined by the coefficient ⁇ . If the coefficient ⁇ is 1, the PM deposition amount Ps is a value of the differential pressure deposition amount PMa, and if the coefficient ⁇ is 0, the PM deposition amount Ps is a value of the model deposition amount PMb.
- the PM deposition amount calculation unit 44 further includes a coefficient determination unit 45 that determines the coefficient ⁇ .
- the exhaust gas flow rate information from the engine controller 30 and the DPF temperature from the temperature sensor 24 are input to the coefficient determination unit 45, and the exhaust gas flow rate in the DPF 72 converted and corrected by the DPF temperature is calculated. Is set to 1 when the value of x exceeds the predetermined value QVth, and is set to 0 when the value of the exhaust gas flow rate is less than the predetermined value QVth.
- the differential pressure deposition amount time change rate calculation unit 43 calculates a differential pressure deposition amount time change rate ⁇ PMa that is a time change rate of the differential pressure deposition amount input from the differential pressure deposition amount calculation unit 41, and the coefficient determination unit The coefficient correction unit 46 in FIG.
- the coefficient determining unit 46 corrects the value of the coefficient ⁇ to a coefficient ⁇ ′ smaller than the value of the coefficient ⁇ when the differential pressure deposition amount time change rate ⁇ PMa exceeds the threshold value ⁇ P Math.
- the PM deposition amount calculation unit 44 first acquires the differential pressure deposition amount PMa from the differential pressure deposition amount calculation unit 41 (step S101). Further, the PM deposition amount calculation unit 44 acquires the model deposition amount PMb from the model deposition amount calculation unit 42 (step S102). Thereafter, the coefficient determination unit 45 performs coefficient determination processing to determine the coefficient ⁇ (step S103). Thereafter, the PM deposition amount calculation unit 44 calculates the PM deposition amount PMs according to the equation (1) using the determined coefficient ⁇ (step S104).
- the PM deposition amount calculation unit 44 determines whether the calculated PM deposition amount PMs exceeds the threshold PMth (step S105). If the PM deposition amount PMs does not exceed the threshold PMth (No at Step S105), the process proceeds to Step S101 and the above-described process is repeated. On the other hand, when the PM deposition amount PMs exceeds the threshold PMth (step S105, Yes), an instruction to perform manual forced regeneration is issued to the regeneration instructing unit 50 (step S106), and then step S101. And repeat the process described above.
- step S103 The coefficient determination process shown in step S103 is performed according to the flowchart shown in FIG. That is, the coefficient determination unit 45 first determines whether the exhaust gas flow rate exceeds the predetermined value QVth (step S201). If the exhaust gas flow rate does not exceed the predetermined value QVth (step S201, No), the coefficient ⁇ is set to 0 (step S203), and the process returns to step S103. On the other hand, if the exhaust gas flow rate exceeds the predetermined value QVth (step S201, Yes), it is determined whether the differential pressure deposition amount temporal change rate ⁇ PMa exceeds the threshold value ⁇ P Math (step S202).
- step S202 If the differential pressure deposition amount time change rate ⁇ PMa does not exceed the threshold value ⁇ P Math (step S202, No), the coefficient ⁇ is set to 1 (step S204), and the process returns to step S103. On the other hand, if the differential pressure deposition amount time change rate ⁇ PMa exceeds the threshold value ⁇ P Math (Yes at step S202), the coefficient ⁇ is corrected to a coefficient ⁇ ′ smaller than 1 (step S205), and the process returns to step S103. .
- the coefficient ⁇ is determined as shown in FIG. That is, when the exhaust gas flow rate QV is less than the predetermined value QVth, the coefficient ⁇ is zero.
- the coefficient ⁇ is 1 when the differential pressure deposition amount time change rate ⁇ PMa is less than the threshold value ⁇ P Math in the case where the predetermined value QVth is exceeded.
- the coefficient ⁇ is corrected to a coefficient ⁇ ′ smaller than one.
- the reason why the coefficient ⁇ is set to 0 when the exhaust gas flow rate QV is less than the predetermined value QVth is that the estimation accuracy of the differential pressure deposition amount PMa is low in the region R1. . Therefore, in the region R1, the PM accumulation amount PMs is estimated by the model accumulation amount PMb with the coefficient ⁇ set to 0. Further, in the case where the exhaust gas flow rate QV exceeds the predetermined value QVth (region R2 shown in FIG. 8), the PM deposition amount PMs is estimated by the differential pressure deposition amount PMa with the coefficient ⁇ set to 1.
- the coefficient ⁇ is set to a coefficient ⁇ ′ smaller than 1 and the influence of the increase in the differential pressure deposition amount PMa accompanying the rapid rise in differential pressure due to cell occlusion. To make it smaller.
- the differential pressure DP rapidly rises as shown by the broken line part along with the cell blockage as shown in FIG. 9 (b).
- the differential pressure deposition amount time change rate ⁇ PMa exceeds the threshold value ⁇ P Math at a time point t1 as indicated by a broken line.
- the calculated PM deposition amount PMs exceeds a threshold PMth for instructing manual forced regeneration.
- the PM deposition amount increment ⁇ S which is the difference between the actual PM deposition amount shown by the solid line in FIG.
- the coefficient ⁇ is set to a coefficient ⁇ ′ smaller than 1 to decrease the PM deposition amount increment ⁇ S, and the estimated percentage of the model deposition amount PMb is increased to compensate.
- the PM deposition amount PMs is estimated using the model deposition amount PMb having a smaller error than the differential pressure deposition amount PMa
- the PM deposition amount PMs is estimated using the differential pressure deposition amount PMa with high accuracy
- the coefficient ⁇ is reduced to reduce the error component due to the pressure difference rapid rise accompanying the cell blockage of the DPF 72, it is possible to reliably give an instruction of manual forced regeneration with high accuracy and no waste.
- the coefficient ⁇ ′ is set to a predetermined value (L1 in FIG. 10) regardless of the fluctuation of the pressure change amount temporal change rate ⁇ PMa (L1 in FIG. 10).
- the value of the coefficient ⁇ ′ may be decreased as the differential pressure deposition amount time change rate ⁇ PMa increases.
- the differential pressure deposition amount time change rate ⁇ PMa may be replaced with a function of the differential pressure time change rate.
- the coefficient is rapidly changed at the predetermined value QVth of the exhaust gas flow rate QV, but the present invention is not limited to this, as shown in FIG. After the value QVth is exceeded, modulation may be performed so that the coefficient ⁇ changes smoothly.
- the coefficient ⁇ is set to 0 in the region R1 and the coefficient ⁇ is set to 1 in the region R2 when there is no occurrence of a rapid rise in the differential pressure deposition amount time change rate ⁇ PMa.
- the coefficient ⁇ of the region R1 is not 0, the model deposition amount PMb is mainly used in the region R1, and the coefficient ⁇ of the region R2 is not 1.
- the differential pressure deposition amount PMa may be mainly used in the region R2.
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Abstract
Description
前記粒子状物質除去フィルタの再生を制御する再生制御部と、前記粒子状物質除去フィルタの入口側と出口側との差圧を検出する差圧センサと、前記粒子状物質除去フィルタに対する手動強制再生を指示する再生指示部と、を備え、前記再生制御部は、前記差圧および前記エンジン制御部から入力される排気ガス流量をもとに前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定した差圧堆積量を算出する差圧堆積量算出部と、前記粒子状物質除去フィルタに入力される前記排気ガス内の粒子状物質量から前記粒子状物質除去フィルタで燃焼する粒子状物質量を減算するモデルを用いて前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定したモデル堆積量を算出するモデル堆積量算出部と、前記差圧堆積量の時間変化率を算出する差圧変化率算出部と、第1係数と第2係数との和が一定値となる条件で、前記差圧堆積量に第1係数を乗算した値と前記モデル堆積量に第2係数を乗算した値との加算値を粒子状物質堆積量として算出する際、前記排気ガス流量が所定値を超える場合、前記第1係数の値を前記第2係数の値に比して大きく設定し、前記排気ガス流量が前記所定値を超え、かつ前記差圧堆積量の時間変化率が所定閾値以上である場合、該設定された前記第1係数を小さくして前記粒子状物質堆積量を算出し、この算出した前記粒子状物質堆積量が閾値を超える場合、前記手動強制再生を行うべき旨の指示を前記再生指示部に出力する粒子状物質堆積量算出部と、を備えたことを特徴とする。
PMs=α・PMa+(1-α)・PMb …(1)
すなわち、差圧堆積量PMaにかかる重み係数である係数αと、モデル堆積量PMbにかかる重み係数である係数(1-α)とは、それぞれ加算して「1」となるようにしている。換言すれば、係数αによって、差圧堆積量PMaとモデル堆積量PMbとの配分比を決定している。係数αが1であれば、PM堆積量Psは、差圧堆積量PMaの値となり、係数αが0であれば、PM堆積量Psは、モデル堆積量PMbの値となる。
α‘=f(ΔPMa)
とし、図10のL2に示すように、差圧堆積量時間変化率ΔPMaの増加に伴って係数α‘の値が減少するようにすればよい。これによって、可能な限り差圧堆積値PMaを用いて推定精度を上げるとともに、無駄な手動強制再生の指示発生を抑えることができる。なお、差圧堆積量時間変化率ΔPMaに替えて、差圧時間変化率の関数としてもよい。
2 エアクリーナ
3 給気管路
4 排気管路
5 冷却機構
6 排気タービン過給機
7 排気浄化装置
8 排気再循環システム
3a エンジン回転速度センサ
3c 給気圧センサ
3d 排気圧センサ
3e タービン回転速度センサ
3f 流量センサ
21 タービン
21a タービン翼車
22 コンプレッサ
23 可変ターボノズル
24 バイパス路
30 エンジンコントローラ
31 排気再循環通路
32 EGRバルブ
33 EGRクーラ
40 再生制御部
41 差圧堆積量算出部
42 モデル堆積量算出部
42a NO2によるPM燃焼量算出部
42b O2によるPM燃焼量算出部
42c 演算器
42d 積算部
43 差圧堆積量時間変化率算出部
44 PM堆積量算出部
45 係数決定部
46 係数修正部
50 再生指示部
70 ドージング燃料供給装置
70a ドージングノズル
71 DOC
72 DPF
73 差圧センサ
74 温度センサ
100 ディーゼルエンジン
Claims (7)
- エンジンの排気ガスから粒子状物質を除去する粒子状物質除去フィルタの入口側と出口側との差圧および排気ガス流量をもとに前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定した差圧堆積量を算出する差圧堆積量算出部と、
前記粒子状物質除去フィルタに入力される前記排気ガス内の粒子状物質量から前記粒子状物質除去フィルタで燃焼する粒子状物質量を減算するモデルを用いて前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定したモデル堆積量を算出するモデル堆積量算出部と、
前記差圧堆積量の時間変化率を算出する差圧堆積量変化率算出部と、
第1係数と第2係数との和が一定値となる条件で、前記差圧堆積量に第1係数を乗算した値と前記モデル堆積量に第2係数を乗算した値との加算値を粒子状物質堆積量として算出する際、前記排気ガス流量が所定値を超える場合、前記第1係数の値を前記第2係数の値に比して大きく設定し、前記排気ガス流量が前記所定値を超え、かつ前記差圧堆積量の時間変化率が所定閾値以上である場合、該設定された前記第1係数を小さくして前記粒子状物質堆積量を算出する粒子状物質堆積量算出部と、
を備えたことを特徴とする粒子状物質堆積量推定装置。 - 前記粒子状物質堆積量算出部は、前記第1係数と前記第2係数との和を1に設定し、前記排気ガス流量が所定値を超える場合、前記第1係数の値を1に設定し、前記排気ガス流量が所定値を超えない場合、前記第1係数の値を0に設定することを特徴とする請求項1に記載の粒子状物質堆積量推定装置。
- 前記粒子状物質堆積量算出部は、前記排気ガス流量が前記所定値を超え、かつ前記差圧堆積量の時間変化率が所定閾値以上である場合、前記差圧堆積量の時間変化率の増加に応じて、設定された前記第1係数を減少させることを特徴とする請求項1または2に記載の粒子状物質堆積量推定装置。
- 前記粒子状物質堆積量算出部は、算出した前記粒子状物質堆積量が閾値を超える場合、前記粒子状物質除去フィルタに対する手動強制再生を行わせる指示を出力することを特徴とする請求項1~3のいずれか一つに記載の粒子状物質堆積量推定装置。
- エンジンの排気ガスから粒子状物質を除去する粒子状物質除去フィルタと、
前記エンジンを制御するエンジン制御部と、
前記粒子状物質除去フィルタの再生を制御する再生制御部と、
前記粒子状物質除去フィルタの入口側と出口側との差圧を検出する差圧センサと、
前記粒子状物質除去フィルタに対する手動強制再生を指示する再生指示部と、
を備え、
前記再生制御部は、
前記差圧および前記エンジン制御部から入力される排気ガス流量をもとに前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定した差圧堆積量を算出する差圧堆積量算出部と、
前記粒子状物質除去フィルタに入力される前記排気ガス内の粒子状物質量から前記粒子状物質除去フィルタで燃焼する粒子状物質量を減算するモデルを用いて前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定したモデル堆積量を算出するモデル堆積量算出部と、
前記差圧堆積量の時間変化率を算出する差圧変化率算出部と、
第1係数と第2係数との和が一定値となる条件で、前記差圧堆積量に第1係数を乗算した値と前記モデル堆積量に第2係数を乗算した値との加算値を粒子状物質堆積量として算出する際、前記排気ガス流量が所定値を超える場合、前記第1係数の値を前記第2係数の値に比して大きく設定し、前記排気ガス流量が前記所定値を超え、かつ前記差圧堆積量の時間変化率が所定閾値以上である場合、該設定された前記第1係数を小さくして前記粒子状物質堆積量を算出し、この算出した前記粒子状物質堆積量が閾値を超える場合、前記手動強制再生を行うべき旨の指示を前記再生指示部に出力する粒子状物質堆積量算出部と、
を備えたことを特徴とする排気ガス浄化システム。 - 前記再生制御部は、前記再生指示部から手動強制再生実行の指示を受け付けた場合、前記エンジン制御部を介して手動強制再生を実行することを特徴とする請求項5に記載の排気ガス浄化システム。
- エンジンの排気ガスから粒子状物質を除去する粒子状物質除去フィルタの入口側と出口側との差圧および排気ガス流量をもとに前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定した差圧堆積量を算出する差圧堆積量ステップと、
前記粒子状物質除去フィルタに入力される前記排気ガス内の粒子状物質量から前記粒子状物質除去フィルタで燃焼する粒子状物質量を減算するモデルを用いて前記粒子状物質除去フィルタに堆積する粒子状物質堆積量を推定したモデル堆積量を算出するモデル堆積量算出ステップと、
前記差圧堆積量の時間変化率を算出する差圧変化率算出ステップと、
第1係数と第2係数との和が一定値となる条件で、前記差圧堆積量に第1係数を乗算した値と前記モデル堆積量に第2係数を乗算した値との加算値を粒子状物質堆積量として算出する際、前記排気ガス流量が所定値を超える場合、前記第1係数の値を前記第2係数の値に比して大きく設定し、前記排気ガス流量が前記所定値を超え、かつ前記差圧堆積量の時間変化率が所定閾値以上である場合、該設定された前記第1係数を小さくして前記粒子状物質堆積量を算出する粒子状物質堆積量算出ステップと、
を含むことを特徴とする粒子状物質堆積量推定方法。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/976,620 US8762034B2 (en) | 2011-03-18 | 2012-02-23 | Particulate matter deposition amount estimation device, exhaust gas purification system, and particulate matter deposition amount estimation method |
| DE112012001284.4T DE112012001284B4 (de) | 2011-03-18 | 2012-02-23 | Partikelbestandteilablagerungsmengenschätzvorrichtung, Abgasreinigungssystem und Partikelbestandteilablagerungsmengenschätzverfahren |
| KR1020137014344A KR101420582B1 (ko) | 2011-03-18 | 2012-02-23 | 입자상 물질 퇴적량 추정 장치, 배기 가스 정화 시스템, 및 입자상 물질 퇴적량 추정 방법 |
| CN201280004122.7A CN103261598B (zh) | 2011-03-18 | 2012-02-23 | 粒子状物质堆积量推定装置、废气净化系统及粒子状物质堆积量推定方法 |
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| CN110043381A (zh) * | 2018-01-15 | 2019-07-23 | 马涅蒂-马瑞利公司 | 用于控制从适于内燃发动机的微粒过滤器流出的微粒量的方法 |
| CN110645075A (zh) * | 2018-06-26 | 2020-01-03 | 株式会社久保田 | 柴油发动机的排气处理装置 |
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- 2012-02-23 DE DE112012001284.4T patent/DE112012001284B4/de active Active
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| CN110043381A (zh) * | 2018-01-15 | 2019-07-23 | 马涅蒂-马瑞利公司 | 用于控制从适于内燃发动机的微粒过滤器流出的微粒量的方法 |
| CN110043381B (zh) * | 2018-01-15 | 2022-03-18 | 马涅蒂-马瑞利公司 | 用于控制从适于内燃发动机的微粒过滤器流出的微粒量的方法 |
| CN110645075A (zh) * | 2018-06-26 | 2020-01-03 | 株式会社久保田 | 柴油发动机的排气处理装置 |
| CN112761757A (zh) * | 2021-01-27 | 2021-05-07 | 东风商用车有限公司 | 一种dpf初始化自学习方法及装置 |
| CN112761757B (zh) * | 2021-01-27 | 2022-03-15 | 东风商用车有限公司 | 一种dpf初始化自学习方法及装置 |
| CN114215630A (zh) * | 2021-12-17 | 2022-03-22 | 同济大学 | 一种混合动力汽油车的尾气排放控制方法 |
| CN114215630B (zh) * | 2021-12-17 | 2022-10-25 | 同济大学 | 一种混合动力汽油车的尾气排放控制方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5325249B2 (ja) | 2013-10-23 |
| CN103261598B (zh) | 2014-07-23 |
| JP2012197705A (ja) | 2012-10-18 |
| DE112012001284T5 (de) | 2014-01-09 |
| CN103261598A (zh) | 2013-08-21 |
| KR20130114174A (ko) | 2013-10-16 |
| US20130269323A1 (en) | 2013-10-17 |
| US8762034B2 (en) | 2014-06-24 |
| KR101420582B1 (ko) | 2014-07-16 |
| DE112012001284B4 (de) | 2015-01-22 |
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