WO2021162437A1 - Système de post-traitement de gaz d'échappement - Google Patents

Système de post-traitement de gaz d'échappement Download PDF

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Publication number
WO2021162437A1
WO2021162437A1 PCT/KR2021/001756 KR2021001756W WO2021162437A1 WO 2021162437 A1 WO2021162437 A1 WO 2021162437A1 KR 2021001756 W KR2021001756 W KR 2021001756W WO 2021162437 A1 WO2021162437 A1 WO 2021162437A1
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WIPO (PCT)
Prior art keywords
exhaust gas
differential pressure
particulate filter
diesel particulate
control device
Prior art date
Application number
PCT/KR2021/001756
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English (en)
Korean (ko)
Inventor
김정호
김태섭
이웅건
안태식
변종욱
이영훈
Original Assignee
두산인프라코어 주식회사
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Publication of WO2021162437A1 publication Critical patent/WO2021162437A1/fr

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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, e.g. for catalytic activity
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • 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 present invention relates to an exhaust gas aftertreatment system, and more particularly, to an exhaust gas aftertreatment system comprising a diesel particulate filter for removing particulate matter contained in exhaust gas.
  • the exhaust gas after-treatment system includes a diesel particulate filter (DPF) to remove particulate matter (PM) and a selective catalytic reduction (SCR) reactor to reduce nitrogen oxides (NOx) etc.
  • DPF diesel particulate filter
  • SCR selective catalytic reduction
  • the diesel particulate filter removes particulate matter such as soot from the exhaust gas of a diesel engine by collecting it in the filter, the particulate matter collected in the filter gradually increases as the engine operating time passes. Accordingly, it is necessary to periodically perform a regeneration operation to burn particulate matter trapped in the diesel particulate filter. For example, regeneration of the diesel particulate filter is performed by increasing the temperature of exhaust gas flowing into the diesel particulate filter to burn particulate matter collected in the diesel particulate filter.
  • a diagnosis of the filtering efficiency of a diesel particulate filter is also newly required. Accordingly, in order to diagnose the filtering efficiency of the diesel particulate filter (DPF), the particulate matter emission amount of the exhaust gas passing through the diesel particulate filter (DPF) is measured using a particulate matter sensor (PM sensor).
  • PM sensor particulate matter sensor
  • the particulate matter sensor (PM sensor) is not only a relatively expensive equipment, but also has a problem in that accuracy is reduced and the lifespan is shortened in an environment in which pressure and temperature are greatly changed.
  • An embodiment of the present invention provides an exhaust gas aftertreatment system capable of effectively diagnosing whether a diesel particulate filter (DPF) is abnormal.
  • DPF diesel particulate filter
  • another embodiment of the present invention provides an exhaust gas post-treatment system capable of effectively diagnosing whether a diesel particulate filter (DPF) is abnormal and whether deposits are generated in a mixer.
  • DPF diesel particulate filter
  • an exhaust gas post-treatment system for post-treatment of exhaust gas includes a diesel particulate filter (DPF) for removing particulate matter contained in exhaust gas, and exhaust gas passing through the diesel particulate filter
  • DPF diesel particulate filter
  • a differential pressure sensor that measures the differential pressure of and a control device for diagnosing whether the diesel particulate filter is abnormal by comparing the differential pressure with the selected differential pressure reference value.
  • the exhaust gas post-treatment system may further include a flow meter for measuring the flow rate of the exhaust gas. And the control device may acquire the exhaust gas flow rate information using the flow meter.
  • control device calculates the flow rate of the exhaust gas through the rotation speed of the engine that discharges the exhaust gas, the rotation speed of the supercharger mounted on the engine, the load of the engine, or the scavenging air pressure of the engine.
  • the exhaust gas flow rate information can also be acquired.
  • control device may diagnose that an abnormality has occurred in the diesel particulate filter when a preset time elapses in a state in which the differential pressure of the exhaust gas measured by the differential pressure sensor is less than the selected differential pressure reference value.
  • the control device may diagnose that the amount of particulate matter discharged through the diesel particulate filter is greater than 25 mg/kWh.
  • control device may diagnose that the carrier of the diesel particulate filter is damaged or the carrier is removed.
  • an exhaust gas post-treatment system for post-treatment of exhaust gas includes a diesel particulate filter (DPF) for removing particulate matter contained in exhaust gas, and the diesel particulate filter A mixer through which the coarse exhaust gas passes, a differential pressure sensor for measuring the differential pressure of exhaust gas that has passed through the diesel particulate filter and the mixer, and data on a differential pressure reference range for each flow rate of exhaust gas are stored, and exhaust gas flow rate Control for diagnosing abnormalities in the diesel particulate filter and the mixer by acquiring information and selecting a differential pressure reference range according to the acquired exhaust gas flow rate information, and comparing the differential pressure of exhaust gas measured by the differential pressure sensor with the selected differential pressure reference range includes the device.
  • DPF diesel particulate filter
  • the exhaust gas post-treatment system may further include a flow meter for measuring the flow rate of the exhaust gas. And the control device may acquire the exhaust gas flow rate information using the flow meter.
  • the control device calculates a flow rate of exhaust gas through a rotation speed of an engine for discharging exhaust gas, a rotation speed of a supercharger mounted on the engine, a load of the engine, or a scavenging air pressure of the engine to calculate the exhaust gas flow rate.
  • Gas flow rate information can be acquired.
  • the control device may diagnose that an abnormality has occurred in the diesel particulate filter when a preset time elapses in a state in which the differential pressure of the exhaust gas measured by the differential pressure sensor is less than the minimum value of the selected differential pressure reference range.
  • the control device may perform forced regeneration of the diesel particulate filter when a preset time elapses in a state in which the differential pressure of the exhaust gas measured by the differential pressure sensor exceeds the maximum value of the selected differential pressure reference range.
  • the control device may diagnose that an abnormality has occurred in the diesel particulate filter when the differential pressure of the exhaust gas measured by the differential pressure sensor is out of the selected differential pressure reference range even after the forced regeneration of the diesel particulate filter.
  • differential pressure of the exhaust gas measured by the differential pressure sensor falls within the selected differential pressure reference range after forcible regeneration of the diesel particulate filter, a precipitate is generated in the mixer and the exhaust gas measured by the differential pressure sensor It may be diagnosed that the differential pressure has exceeded the maximum value of the selected differential pressure reference range.
  • the exhaust gas after-treatment system can effectively diagnose whether the diesel particulate filter (DPF) is abnormal.
  • DPF diesel particulate filter
  • the exhaust gas after-treatment system can effectively diagnose whether the diesel particulate filter (DPF) is abnormal and whether deposits are generated in the mixer.
  • DPF diesel particulate filter
  • FIG. 1 is a block diagram of an exhaust gas post-treatment system according to a first embodiment of the present invention.
  • Figure 2 shows a normal diesel particulate filter used in the exhaust gas aftertreatment system of Figure 1;
  • 3 and 4 show abnormal diesel particulate filters used in an exhaust gas aftertreatment system.
  • FIG. 5 is a flowchart illustrating an operation process of the exhaust gas post-treatment system of FIG. 1 .
  • FIG. 6 is a block diagram of an exhaust gas post-treatment system according to a second embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating an operation process of the exhaust gas post-treatment system of FIG. 6 .
  • the embodiment of the present invention specifically represents an ideal embodiment of the present invention. As a result, various modifications of the diagram are expected. Therefore, the embodiment is not limited to a specific shape of the illustrated area, and includes, for example, a shape modification by manufacturing.
  • a diesel engine 100 for a construction machine is exemplarily shown as an emission source for discharging exhaust gas, but the first embodiment of the present invention is not limited thereto. That is, the first embodiment of the present invention can be applied to various power units.
  • the engine 100 discharges exhaust gas containing environmental control substances such as particulate matter (PM) and nitrogen oxides (NOx).
  • PM particulate matter
  • NOx nitrogen oxides
  • the engine 100 may be equipped with a turbo charger 150 . That is, the exhaust gas discharged from the engine 100 may be discharged through the supercharger 150 .
  • the supercharger 150 increases the output of the engine 100 by turning the turbine with the pressure of the exhaust gas of the engine 100 and supplying new external air to the engine 100 by compressing it. And the exhaust gas discharged from the engine 100 passes through the supercharger 150, the temperature and pressure are lowered.
  • the exhaust gas aftertreatment system 101 includes a diesel particulate filter (DPF) 200, a differential pressure sensor 720, and a control device ( 700).
  • DPF diesel particulate filter
  • the exhaust gas post-treatment system 101 may further include an exhaust flow path 610 and a flow meter 400 .
  • the exhaust flow path 610 is connected to the exhaust port of the engine 100 , which is the aforementioned power device, to move the exhaust gas discharged from the engine 100 .
  • a diesel particulate filter (DPF) 200 is installed on the exhaust flow path 610 to physically collect and burn particulate matter contained in the exhaust gas to remove it.
  • the diesel particulate filter (DPF) 200 removes particulate matter, such as soot, from the exhaust gas of the engine 100 by collecting it, the particulate matter collected in the diesel particulate filter 200 is 100) gradually increases as the operating time elapses. Therefore, it is necessary to periodically perform a regeneration operation to burn the particulate matter collected in the diesel particulate filter 200 .
  • the diesel particulate filter 200 may be regenerated by increasing the temperature of exhaust gas flowing into the diesel particulate filter 200 to burn particulate matter collected in the diesel particulate filter 200 , and the diesel particulate filter 200 may be regenerated.
  • the temperature of the exhaust gas required for regeneration of the filter 200 may be in the range of 500 degrees Celsius to 650 degrees Celsius.
  • a separate sensor (not shown) may be installed in the diesel particulate filter 200 or upstream and downstream of the diesel particulate filter 200 to check the regeneration condition.
  • the separate sensor may include a temperature sensor and a pressure sensor, and measure the pressure or temperature of exhaust gas passing through the diesel particulate filter 200 to help determine whether to regenerate.
  • upstream and downstream refer to the flow of exhaust gas.
  • the differential pressure sensor 720 measures the differential pressure of exhaust gas that has passed through the diesel particulate filter 200 .
  • the flow meter 400 measures the flow rate of exhaust gas discharged from the engine 100 .
  • the flow meter 400 may be omitted in some cases.
  • the control device 700 stores data on the reference value of differential pressure for each flow rate of exhaust gas.
  • the data may be a table as exemplified in Table 1 or a mapping graph.
  • the control device 700 acquires exhaust gas flow rate information.
  • the exhaust gas flow rate information may be acquired using the flow meter 400 .
  • the control device 700 includes the rotation speed of the engine 100 emitting exhaust gas, and the supercharger 150 mounted on the engine 100 . ), the load of the engine 100, or the exhaust gas flow rate information may be obtained by calculating the exhaust gas flow rate through the scavenging air pressure of the engine 100 .
  • the control device 700 selects a differential pressure reference value according to the acquired exhaust gas flow rate information, and compares the differential pressure of the exhaust gas measured by the differential pressure sensor 720 with the selected differential pressure reference value to diagnose whether the diesel particulate filter 200 is abnormal. can do.
  • the control device 700 may diagnose that an abnormality has occurred in the diesel particulate filter 200 when a preset time elapses when the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is less than the selected differential pressure reference value.
  • the differential pressure measured by the differential pressure sensor 720 may also change instantaneously.
  • the differential pressure may be momentarily and abruptly changed due to sensor noise of the differential pressure sensor 720 . Accordingly, when the differential pressure measured for a predetermined time is maintained lower than the selected differential pressure reference value, the control device 200 may confirm the diagnosis to increase accuracy.
  • the control device 700 may diagnose that an abnormality has occurred in the diesel particulate filter 200 when a preset time elapses when the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is less than the selected differential pressure reference value.
  • the control device 700 determines that the amount of particulate matter discharged through the diesel particulate filter 200 is greater than 25 mg/kWh. can be diagnosed
  • control device 700 may diagnose that the carrier of the diesel particulate filter 200 is damaged or the carrier is removed.
  • the control device 700 may automatically diagnose whether the diesel particulate filter 200 is abnormal.
  • the control device 700 diagnoses an abnormality in the diesel particulate filter 200 , it continuously generates a warning sound or limits the operation of the engine 100 , such as a problem caused by an abnormality or a defect in the diesel particulate filter 200 . can prevent the occurrence of
  • FIG. 2 shows a carrier of the diesel particulate filter 200 in a normal state
  • FIG. 3 shows a state in which the carrier of the diesel particulate filter is damaged
  • FIG. 4 shows a state in which the carrier is removed from the diesel particulate filter.
  • the differential pressure reference value of may be different from each other.
  • the exhaust gas post-treatment system 101 can effectively diagnose whether the diesel particulate filter (DPF) is abnormal.
  • DPF diesel particulate filter
  • the flow rate of the exhaust gas is measured or calculated.
  • the flow rate of the exhaust gas is measured using the flow meter 400 or the control device 700 is the rotation speed of the engine 100, the rotation speed of the supercharger 150 mounted on the engine 100, the engine 100
  • the flow rate of the exhaust gas may be calculated through the load of the engine 100 or the scavenging air pressure of the engine 100 .
  • Such information may be transmitted to the control device 700 through a sensor basically built into the engine 100 or the supercharger 150 .
  • control device 700 selects the differential pressure reference value by substituting the measured or calculated flow rate of exhaust gas into the data for the differential pressure reference value for each flow rate of the stored exhaust gas.
  • the differential pressure of the exhaust gas that has passed through the diesel particulate filter 200 is measured through the differential pressure sensor 720 , and the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is compared with a differential pressure reference value selected from data. Specifically, it is determined whether the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is less than a reference value of differential pressure selected from data.
  • the control device 700 diagnoses that an abnormality has occurred in the diesel particulate filter 200 when a preset time elapses when the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is less than the selected differential pressure reference value. Accordingly, even if the differential pressure measured by the differential pressure sensor 720 is momentarily abruptly changed due to a sudden load change of the engine 100 or sensor noise of the differential pressure sensor 720 , the control device 700 controls the differential pressure measured for a certain period of time. When the selected differential pressure is kept lower than the reference value, the diagnosis can be confirmed and the accuracy can be increased.
  • the control device 700 controls the emission of particulate matter discharged through the diesel particulate filter 200 It can be diagnosed as greater than 25 mg/kWh.
  • the control device 700 determines that the carrier of the diesel particulate filter 200 is damaged or the carrier has been removed. can be diagnosed.
  • the differential pressure reference value of may be different from each other.
  • the exhaust gas post-treatment system 101 can effectively diagnose whether the diesel particulate filter (DPF) is abnormal.
  • DPF diesel particulate filter
  • the exhaust gas aftertreatment system 102 includes a diesel particulate filter (DPF) 200 , a mixer 250 , and a differential pressure sensor. 720 , and a control device 700 .
  • DPF diesel particulate filter
  • the exhaust gas post-treatment system 102 may further include an exhaust flow path 610 and a flow meter 400 .
  • the mixer 250 is located downstream of the diesel particulate filter 200 on the exhaust flow path 610 . That is, the exhaust gas passing through the diesel particulate filter 200 passes through the mixer 250 .
  • the mixer 250 may mix a reducing agent and exhaust gas for selective catalytic reduction (SCR).
  • SCR selective catalytic reduction
  • the selective catalytic reduction reaction can reduce nitrogen oxides contained in exhaust gas.
  • a reducing agent for the selective catalytic reduction reaction ammonia (NH 3 ) is used. That is, ammonia reacts with nitrogen oxides to reduce nitrogen oxides.
  • NH 3 reducing agent for the selective catalytic reduction reaction
  • ammonia reacts with nitrogen oxides to reduce nitrogen oxides.
  • ammonia itself is not easy to store and transport as a contaminant, it is common to use a stable aqueous solution of urea that is a reducing agent precursor rather than directly using ammonia.
  • urea urea, CO(NH 2 ) 2
  • ammonia NH 3
  • urea is directly injected into the exhaust gas having a temperature of less than 250 degrees Celsius
  • biuret, cyanuric acid, melamine, and ammeline, etc. are generated as urea is decomposed.
  • the sediment is by-product.
  • the differential pressure sensor 720 measures the differential pressure of exhaust gas that has passed through the diesel particulate filter 200 and the mixer 250 .
  • the control device 700 stores data on a differential pressure reference range for each flow rate of exhaust gas.
  • the data may be a table as exemplified in Table 2 or a mapping graph.
  • the control device 700 acquires exhaust gas flow rate information.
  • the exhaust gas flow rate information may be acquired using the flow meter 400 .
  • the control device 700 includes the rotation speed of the engine 100 emitting exhaust gas, and the supercharger 150 mounted on the engine 100 . ), the load of the engine 100, or the exhaust gas flow rate information may be obtained by calculating the exhaust gas flow rate through the scavenging air pressure of the engine 100 .
  • the control device 700 selects a differential pressure reference range according to the acquired exhaust gas flow rate information, compares the differential pressure of exhaust gas measured by the differential pressure sensor 720 with the minimum and maximum values of the selected differential pressure reference range to filter the diesel particulate filter ( 200) and the presence or absence of an abnormality in the mixer 250 may be diagnosed. Specifically, the control device 700 may diagnose whether the diesel particulate filter 200 is abnormal and whether a deposit is generated in the mixer 250 .
  • control device 700 can diagnose that an abnormality has occurred in the diesel particulate filter 200 when a preset time elapses when the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is less than the minimum value of the selected differential pressure reference range. have.
  • the differential pressure measured by the differential pressure sensor 720 may also change instantaneously. Also, the differential pressure may be momentarily and abruptly changed due to sensor noise of the differential pressure sensor 720 . Accordingly, when the differential pressure measured for a predetermined time is maintained lower than the minimum value of the selected differential pressure reference range, the control device 200 may confirm the diagnosis to increase accuracy.
  • the control device 700 diagnoses that an abnormality has occurred in the diesel particulate filter 200 when a preset time elapses when the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is less than the minimum value of the selected differential pressure reference range.
  • control device 700 determines that the differential pressure of the exhaust gas measured by the differential pressure sensor 720 exceeds the maximum value of the selected differential pressure reference range and when a preset time elapses, the diesel particulate Forced regeneration of the filter 250 is performed.
  • control device 700 diagnoses that an abnormality has occurred in the diesel particulate filter 250 if the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is out of the selected differential pressure reference range even after the forced regeneration of the diesel particulate filter 250 . will do
  • the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is lower than the minimum value of the selected differential pressure reference range even after the steel material is regenerated, it can be seen that the carrier of the diesel particulate filter 200 is damaged or the carrier has been removed. Conversely, if the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is higher than the maximum value of the selected differential pressure reference range even after the steel is regenerated, soot is excessively present in the diesel particulate filter 200 to reduce its performance. It may not be available or it may be considered that the service life has expired, and replacement of the diesel particulate filter 200 may be required.
  • the control device 700 generates deposits in the mixer 250, It may be diagnosed that the differential pressure of the exhaust gas measured by the differential pressure sensor 720 has exceeded the maximum value of the selected differential pressure reference range. In this case, the diesel particulate filter 200 may be diagnosed as normal.
  • the exhaust gas post-treatment system 102 can effectively diagnose whether the diesel particulate filter (DPF) is abnormal and whether deposits are generated in the mixer. have.
  • DPF diesel particulate filter
  • the flow rate of the exhaust gas is measured or calculated.
  • the flow rate of the exhaust gas is measured using the flow meter 400 or the control device 700 is the rotation speed of the engine 100, the rotation speed of the supercharger 150 mounted on the engine 100, the engine 100
  • the flow rate of the exhaust gas may be calculated through the load of the engine 100 or the scavenging air pressure of the engine 100 .
  • Such information may be transmitted to the control device 700 through a sensor basically built into the engine 100 or the supercharger 150 .
  • control device 700 selects the differential pressure reference range by substituting the measured or calculated exhaust gas flow rate into the data on the differential pressure reference range for each flow rate of the stored exhaust gas.
  • the differential pressure of the exhaust gas that has passed through the diesel particulate filter 200 is measured through the differential pressure sensor 720 , and the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is compared with the differential pressure reference range selected from the data.
  • the control device 700 diagnoses that the diesel particulate filter is normal.
  • control device 700 diagnoses that an abnormality has occurred in the diesel particulate filter 200 when a preset time elapses when the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is less than the minimum value of the selected differential pressure reference range.
  • control device 700 performs forced regeneration of the diesel particulate filter 250 when a preset time elapses when the differential pressure of the exhaust gas measured by the differential pressure sensor 720 exceeds the maximum value of the selected differential pressure reference range.
  • control device 700 diagnoses that an abnormality has occurred in the diesel particulate filter 250 if the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is out of the selected differential pressure reference range even after the forced regeneration of the diesel particulate filter 250 . will do
  • the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is lower than the minimum value of the selected differential pressure reference range even after the steel is regenerated, it may be considered that the carrier of the diesel particulate filter 200 is damaged or the carrier has been removed.
  • the differential pressure of the exhaust gas measured by the differential pressure sensor 720 is higher than the maximum value of the selected differential pressure reference range even after the steel is regenerated, soot is excessively present in the diesel particulate filter 200 to reduce its performance. It may not be available or it may be considered that the service life has expired, and replacement of the diesel particulate filter 200 may be required.
  • the control device 700 generates deposits in the mixer 250, It may be diagnosed that the differential pressure of the exhaust gas measured by the differential pressure sensor 720 has exceeded the maximum value of the selected differential pressure reference range. In this case, the diesel particulate filter 200 may be diagnosed as normal.
  • the exhaust gas after-treatment system 102 can effectively diagnose whether the diesel particulate filter (DPF) is abnormal and whether deposits are generated in the mixer.
  • DPF diesel particulate filter
  • the exhaust gas post-treatment system 102 can effectively diagnose whether the diesel particulate filter (DPF) is abnormal.
  • DPF diesel particulate filter
  • the exhaust gas after-treatment system can be used to effectively diagnose whether a diesel particulate filter (DPF) is abnormal.
  • DPF diesel particulate filter
  • the exhaust gas post-treatment system can be used to effectively diagnose whether a diesel particulate filter (DPF) is abnormal and whether deposits are generated in a mixer.
  • DPF diesel particulate filter

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

La présente invention concerne un système de post-traitement de gaz d'échappement pour le post-traitement d'un gaz d'échappement. Le système de post-traitement de gaz d'échappement selon un mode de réalisation de la présente invention comprend : un filtre à particules diesel permettant d'éliminer un matériau particulaire présent dans un gaz d'échappement; un capteur de pression différentielle permettant de mesurer une pression différentielle du gaz d'échappement qui a traversé le filtre à particules diesel; et un dispositif de commande qui stocke des données de valeurs de référence de pression différentielle selon des débits du gaz d'échappement, obtient des informations de débit de gaz d'échappement, sélectionne une valeur de référence de pression différentielle selon les informations de débit de gaz d'échappement obtenues, et compare la pression différentielle du gaz d'échappement mesurée par le capteur de pression différentielle avec la valeur de référence de pression différentielle sélectionnée pour diagnostiquer s'il y a ou non une anomalie dans le filtre à particules diesel.
PCT/KR2021/001756 2020-02-13 2021-02-09 Système de post-traitement de gaz d'échappement WO2021162437A1 (fr)

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KR10-2020-0017523 2020-02-13
KR20200017523 2020-02-13

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WO2021162437A1 true WO2021162437A1 (fr) 2021-08-19

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015214895A (ja) * 2014-05-08 2015-12-03 トヨタ自動車株式会社 パティキュレートフィルタの異常判定装置
US20160251995A1 (en) * 2015-02-26 2016-09-01 Toyota Jidosha Kabushiki Kaisha Abnormality determination system for an exhaust device
JP2019070326A (ja) * 2017-10-06 2019-05-09 株式会社豊田自動織機 内燃機関の排気浄化装置及び内燃機関の排気浄化装置の異常判定方法
KR20190131103A (ko) * 2017-03-29 2019-11-25 로베르트 보쉬 게엠베하 미립자 필터의 진단 방법 및 그 컴퓨터 프로그램 제품
JP2020002825A (ja) * 2018-06-26 2020-01-09 株式会社クボタ ディーゼルエンジンの排気処理装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015214895A (ja) * 2014-05-08 2015-12-03 トヨタ自動車株式会社 パティキュレートフィルタの異常判定装置
US20160251995A1 (en) * 2015-02-26 2016-09-01 Toyota Jidosha Kabushiki Kaisha Abnormality determination system for an exhaust device
KR20190131103A (ko) * 2017-03-29 2019-11-25 로베르트 보쉬 게엠베하 미립자 필터의 진단 방법 및 그 컴퓨터 프로그램 제품
JP2019070326A (ja) * 2017-10-06 2019-05-09 株式会社豊田自動織機 内燃機関の排気浄化装置及び内燃機関の排気浄化装置の異常判定方法
JP2020002825A (ja) * 2018-06-26 2020-01-09 株式会社クボタ ディーゼルエンジンの排気処理装置

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