WO2020054815A1 - Dispositif de purification d'échappement et procédé de purification d'échappement - Google Patents

Dispositif de purification d'échappement et procédé de purification d'échappement Download PDF

Info

Publication number
WO2020054815A1
WO2020054815A1 PCT/JP2019/035959 JP2019035959W WO2020054815A1 WO 2020054815 A1 WO2020054815 A1 WO 2020054815A1 JP 2019035959 W JP2019035959 W JP 2019035959W WO 2020054815 A1 WO2020054815 A1 WO 2020054815A1
Authority
WO
WIPO (PCT)
Prior art keywords
regeneration process
exhaust gas
internal combustion
combustion engine
collection filter
Prior art date
Application number
PCT/JP2019/035959
Other languages
English (en)
Japanese (ja)
Inventor
直人 村澤
彰朗 西方
隆之 椋梨
Original Assignee
いすゞ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Publication of WO2020054815A1 publication Critical patent/WO2020054815A1/fr

Links

Images

Classifications

    • 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
    • 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

Definitions

  • the present disclosure relates to an exhaust gas purification device and an exhaust gas purification method.
  • an exhaust gas purification device for purifying exhaust gas discharged from an internal combustion engine
  • an exhaust gas purification device provided with a particulate collection filter is known (for example, see Patent Document 1).
  • the particulate collection filter collects particulate matter (Particulate @Matter: PM) in the exhaust gas.
  • the collected PM accumulates on the fine particle collection filter.
  • the exhaust gas purification device performs a regeneration process for removing PM accumulated on the particulate filter.
  • This regeneration process is performed, for example, by injecting fuel into a cylinder or an exhaust pipe of an internal combustion engine, and oxidizing the fuel with an oxidation catalyst provided in a stage preceding the particulate collection filter. As the fuel is oxidized, the temperature of the exhaust gas rises, and the PM deposited on the particulate matter filter burns.
  • Patent Literature 1 discloses that a deposition amount of PM deposited on a particulate matter collection filter is estimated based on an engine state, and a regeneration process is started when the deposition amount of PM exceeds a regeneration start threshold. Have been.
  • Patent Document 1 starts the regeneration process when the amount of PM deposited on the particulate collection filter exceeds the regeneration start threshold, and the amount of PM deposited on the particulate collection filter falls below the regeneration end threshold. If so, the reproduction process has been completed. However, this method may not be able to sufficiently remove PM.
  • An object of the present disclosure is to provide an exhaust gas purification device and an exhaust gas purification method capable of sufficiently removing PM accumulated on a particulate matter collection filter.
  • An exhaust emission control device includes a particulate collection filter that collects particulate matter in exhaust gas discharged from an internal combustion engine, and the particulate collection filter based on a value related to an operation time of the internal combustion engine.
  • a control unit that determines the start of a regeneration process for removing the particulate matter deposited on the filter, and that determines the end of the regeneration process based on the time during which the regeneration process is being performed. It is.
  • an exhaust gas purification method is an exhaust gas purification method in an apparatus including a particulate collection filter that captures particulate matter in exhaust gas discharged from an internal combustion engine, wherein the operation of the internal combustion engine is performed.
  • the start of the regeneration process for removing the particulate matter deposited on the particulate filter is determined based on a time-related value, and the termination of the regeneration process is determined based on the time during which the regeneration process is performed.
  • Judgment is an exhaust purification method.
  • FIG. 1 is a schematic diagram illustrating an example of the exhaust gas purification device according to the embodiment.
  • FIG. 2 is a flowchart illustrating an example of the operation of the control unit.
  • FIG. 3 is a time chart showing a change in the amount of deposited PM in the particulate matter collection filter.
  • FIG. 1 is a diagram schematically showing the exhaust gas purification device 100.
  • the exhaust gas purification device 100 is arranged at a stage subsequent to the internal combustion engine 1.
  • the internal combustion engine 1 and the exhaust gas purification device 100 are mounted on, for example, a vehicle.
  • the internal combustion engine 1 is, for example, a diesel engine.
  • An exhaust pipe 4 through which exhaust gas discharged from the internal combustion engine 1 flows is connected to the internal combustion engine 1.
  • the exhaust gas discharged from the internal combustion engine 1 flows from left to right in FIG.
  • the exhaust gas purifying apparatus 100 has a DOC (Diesel Oxidation Catalyst) 5, a DPF (Diesel Particulate Filter) 6, a differential pressure sensor 7, a temperature sensor 8, and an ECU (Electric Control Unit) 10.
  • the DOC 5 and the DPF 6 are provided in the exhaust pipe 4.
  • the DPF 6 is arranged after the DOC 5.
  • the DPF 6 is an example of a “particle trapping filter”.
  • the differential pressure sensor 7 is an example of a “differential pressure detecting unit”.
  • the ECU 10 is an example of a “control unit”.
  • PM is an example of a “particulate matter”.
  • DOC5 oxidizes hydrocarbons (HC) and carbon monoxide (CO) contained in the exhaust gas.
  • the DPF 6 captures PM contained in the exhaust gas.
  • the collected PM is deposited on the DPF 6.
  • the PM deposited on the DPF 6 is removed by a regeneration process. This regeneration process is performed, for example, by injecting fuel into the cylinder or the exhaust pipe 4 of the internal combustion engine 1 and oxidizing it with the DOC 5 provided before the DPF 6. As the fuel is oxidized, the temperature of the exhaust gas rises, and the PM deposited on the DPF 6 burns.
  • the DPF 6 is formed of, for example, a porous ceramic having a fine pore diameter.
  • the differential pressure sensor 7 detects a differential pressure between the pressure on the upstream side of the DPF 6 and the pressure on the downstream side of the DPF 6.
  • the differential pressure sensor 7 outputs a signal indicating the detected differential pressure (hereinafter, referred to as “detected differential pressure”) to the ECU 10.
  • the temperature sensor 8 detects the temperature of the exhaust gas in the DPF 6. Temperature sensor 8 outputs a signal indicating the detected temperature (hereinafter, referred to as “detected temperature”) to ECU 10.
  • the ECU 10 controls the regeneration process of the DPF 6.
  • the ECU 10 includes, for example, CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and the like as hardware. Each function of the ECU 10 described below is realized by the CPU executing a computer program read from the ROM on the RAM.
  • the ECU 10 provides a signal indicating the detected differential pressure detected by the differential pressure sensor 7, a signal indicating the detected temperature detected by the temperature sensor 8, and a vehicle detected by the odometer 9 (see FIG. 1). Is input as needed.
  • the travel distance is an example of “a value related to the operation time of the internal combustion engine”.
  • Various information such as the temperature of the DPF 6 is input to the ECU 10 as needed. Further, the ECU 10 calculates the fuel injection amount of the engine 1, the EGR rate, and the like as needed.
  • FIG. 2 is a flowchart illustrating an example of the operation of the ECU 10.
  • the flowchart shown in FIG. 2 is repeatedly executed at a predetermined cycle while the internal combustion engine 1 is operating.
  • step S1 the ECU 10 determines whether or not to start the regeneration process based on the PM accumulation amount. In step S1, for example, when the PM accumulation amount exceeds a predetermined first threshold value, it is determined that the regeneration process is started.
  • the PM accumulation amount can be estimated by a known method based on the fuel injection amount of the engine 1, the EGR rate, the temperature of the DPF 6, and the like.
  • step S1 If it is determined in step S1 that the reproduction process is to be started, the process proceeds to step S11. The processing after step S11 will be described later.
  • step S1 determines whether the reproduction process is not to be started. If it is determined in step S1 that the reproduction process is not to be started, the process proceeds to step S2.
  • step S2 the ECU 10 determines whether or not to start the regeneration process based on the traveling distance. In step S2, for example, it is determined that the reproduction process is to be started when the travel distance from when the reproduction process was performed based on the previous travel distance has reached a predetermined second threshold value.
  • step S2 If it is determined in step S2 to start the reproduction process, the process proceeds to step S21.
  • the processing after step S21 will be described later.
  • step S2 if it is determined in step S2 that the reproduction process is not to be started, the process ends.
  • step S11 the ECU 10 executes a regeneration process. Specifically, fuel is injected into the cylinder of the internal combustion engine 1 or the exhaust pipe 4. Thereby, the fuel is oxidized by the oxidation catalyst, the temperature of the exhaust gas rises, and the PM deposited on the DPF 6 burns.
  • step S12 the ECU 10 determines whether or not to end the regeneration process based on the PM accumulation amount.
  • step S12 for example, when the PM accumulation amount falls below a predetermined third threshold, it is determined that the regeneration process is to be ended. It is preferable that the PM accumulation amount is estimated by a known method based on other parameters.
  • step S12 If it is determined in step S12 that the reproduction process is not to be ended, the process returns to step S11.
  • step S12 determines whether the reproduction process is to be ended. If it is determined in step S12 that the reproduction process is to be ended, the process proceeds to step S2 described above.
  • step S21 the ECU 10 executes a regeneration process. Specifically, fuel is injected into the cylinder of the internal combustion engine 1 or the exhaust pipe 4. Thereby, the fuel is oxidized by the oxidation catalyst, the temperature of the exhaust gas rises, and the PM deposited on the DPF 6 burns.
  • step S22 following step S21 the ECU 10 determines whether the PM accumulation amount has fallen below a predetermined fourth threshold value (an example of “predetermined accumulation amount”).
  • a predetermined fourth threshold value an example of “predetermined accumulation amount”.
  • the above-described third threshold may be used.
  • step S22 NO If the PM accumulation amount is not less than the fourth threshold value in step S22 (step S22: NO), the process returns to step S21.
  • step S22 when the amount of accumulated PM falls below the fourth threshold value (step S22: YES), the process proceeds to step S23.
  • step S23 the ECU 10 determines in the present regeneration process that the time during which the temperature of the exhaust gas in the DPF 6 is equal to or higher than the predetermined temperature (hereinafter, referred to as “elapsed time”) is a predetermined fifth threshold value (“ It is determined whether or not the “predetermined time” has been reached.
  • elapsed time the time during which the temperature of the exhaust gas in the DPF 6 is equal to or higher than the predetermined temperature (hereinafter, referred to as “elapsed time”) is a predetermined fifth threshold value (“ It is determined whether or not the “predetermined time” has been reached.
  • a fifth threshold value a value sufficient to completely burn the PM deposited on the DPF 6 is set.
  • the fifth threshold can be approximately a few minutes.
  • step S23 NO
  • the process returns to step S21.
  • step S23 YES
  • the exhaust gas purification device 100 determines the end of the regeneration process based on the PM accumulation amount.
  • the end of the regeneration process is determined based on the PM accumulation amount and the elapsed time.
  • the end of the regeneration process is determined based on the time during which the exhaust gas temperature exceeds a predetermined temperature and is at a temperature sufficient for PM combustion, so that the PM deposited on the DPF 6 is sufficiently removed. ing.
  • FIG. 3 is a time chart showing a change in the amount of accumulated PM in the DPF 6.
  • the horizontal axis indicates the traveling distance
  • the vertical axis indicates the PM accumulation amount.
  • the dashed line in FIG. 3 indicates the actual value of the PM accumulation amount in the comparative example.
  • the end of the regeneration process is determined based on the PM accumulation amount regardless of the regeneration start condition.
  • the estimated value of the PM accumulation amount is indicated by a dashed line.
  • the reproduction process is started based on the traveling distance.
  • the amount of accumulated PM decreases.
  • the PM accumulation amount is estimated based on information such as the fuel injection amount of the engine 1, the EGR rate, and the temperature of the DPF 6 over a long time. Because it is very large.
  • the solid line in FIG. 3 shows the actual value of the PM deposition amount in the present embodiment.
  • the end of the regeneration process is determined based on the PM accumulation amount and the elapsed time.
  • the travel distance d0 to the travel distance d2 is the same as in the above-described comparative example.
  • the PM accumulation amount falls below the fourth threshold, but the elapsed time has not reached the fifth threshold. Therefore, the reproduction process is continuously performed after the traveling distance d2. As a result, the PM accumulation amount continues to decrease.
  • the PM accumulation amount falls below the predetermined accumulation amount, and the elapsed time is the predetermined time.
  • the reproduction process is terminated.
  • the reproduction process is started based on the traveling distance
  • the present invention is not limited to this.
  • the regeneration process may be started based on the operation time of the internal combustion engine 1.
  • the reproduction process may be started based on the running time.
  • the end of the reproduction process may be determined based on the elapsed time from the start of the reproduction process.
  • the temperature sensor 8 can be omitted.
  • the transition of the combustion of PM due to the execution of the regeneration process is affected by the operating state of the internal combustion engine 1 and the like. Therefore, the value used to determine the end of the regeneration process may be variably set based on the operating state of the internal combustion engine 1 or the like.

Landscapes

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

Abstract

La présente invention a pour objet d'éliminer suffisamment les PM déposées dans un filtre de capture de particules. L'invention réalise à cet effet un dispositif de purification d'échappement (100) qui est pourvu d'un filtre de capture de particules (6) qui capture une matière particulaire dans les gaz d'échappement évacués d'un moteur à combustion interne (1), et d'une unité de commande (10) qui, sur la base d'une valeur associée au temps de fonctionnement du moteur à combustion interne (1), détermine le début d'un processus de régénération visant à éliminer la matière particulaire déposée dans le filtre de capture de particules (6) et qui, sur la base du temps pendant lequel le processus de régénération a été effectué, détermine la fin du processus de régénération.
PCT/JP2019/035959 2018-09-14 2019-09-12 Dispositif de purification d'échappement et procédé de purification d'échappement WO2020054815A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018172201A JP2020045767A (ja) 2018-09-14 2018-09-14 排気浄化装置および排気浄化方法
JP2018-172201 2018-09-14

Publications (1)

Publication Number Publication Date
WO2020054815A1 true WO2020054815A1 (fr) 2020-03-19

Family

ID=69778588

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/035959 WO2020054815A1 (fr) 2018-09-14 2019-09-12 Dispositif de purification d'échappement et procédé de purification d'échappement

Country Status (2)

Country Link
JP (1) JP2020045767A (fr)
WO (1) WO2020054815A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003035131A (ja) * 2001-07-25 2003-02-07 Nissan Motor Co Ltd 内燃機関の排気浄化装置
JP2005282549A (ja) * 2004-03-31 2005-10-13 Isuzu Motors Ltd 排気ガス浄化システムの制御方法及び排気ガス浄化システム
JP2005291036A (ja) * 2004-03-31 2005-10-20 Denso Corp パティキュレートフィルタの再生処理装置
JP2007278206A (ja) * 2006-04-07 2007-10-25 Fuji Heavy Ind Ltd ディーゼルエンジンの排気浄化装置
JP2017008801A (ja) * 2015-06-22 2017-01-12 株式会社クボタ 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
JP2003035131A (ja) * 2001-07-25 2003-02-07 Nissan Motor Co Ltd 内燃機関の排気浄化装置
JP2005282549A (ja) * 2004-03-31 2005-10-13 Isuzu Motors Ltd 排気ガス浄化システムの制御方法及び排気ガス浄化システム
JP2005291036A (ja) * 2004-03-31 2005-10-20 Denso Corp パティキュレートフィルタの再生処理装置
JP2007278206A (ja) * 2006-04-07 2007-10-25 Fuji Heavy Ind Ltd ディーゼルエンジンの排気浄化装置
JP2017008801A (ja) * 2015-06-22 2017-01-12 株式会社クボタ エンジンの排気処理装置

Also Published As

Publication number Publication date
JP2020045767A (ja) 2020-03-26

Similar Documents

Publication Publication Date Title
US20080314371A1 (en) System and method for diesel particulate filter regeneration
KR20120128380A (ko) 배기가스 후처리 방법
JP6365560B2 (ja) 内燃機関の排気浄化装置
KR20120011563A (ko) 배기가스 후처리 시스템 및 이 제어방법
JP6973195B2 (ja) 排気浄化装置、車両および排気浄化制御装置
JP2020012400A (ja) 排気処理装置
JP2010249076A (ja) 内燃機関の排気浄化装置
WO2020054815A1 (fr) Dispositif de purification d'échappement et procédé de purification d'échappement
JP2008121631A (ja) 内燃機関の排気浄化装置
CN112673155B (zh) 排气净化装置及排气净化方法
JP5569690B2 (ja) 内燃機関の排気浄化装置
KR100957275B1 (ko) 차량 배기 계의 후 처리 장치를 구성하는 매연 여과 필터의다단 재생 방법
WO2017130408A1 (fr) Dispositif de purification d'échappement
KR20120001431A (ko) 배기가스 후처리 시스템 및 이 제어방법
JP2010174794A (ja) 排ガス浄化装置
JP6642199B2 (ja) 排気浄化装置
JP2003020933A (ja) 内燃機関の排気浄化装置
JP6658210B2 (ja) 排気浄化装置
JP4292861B2 (ja) 排気ガス浄化方法及びそのシステム
JP2007032553A (ja) 内燃機関の排気ガス浄化装置
JP6132803B2 (ja) 内燃機関の排ガス浄化装置
JP2011099378A (ja) Ｄｐｆ再生制御装置
JP2005207240A (ja) パティキュレートフィルタの異常判定装置
JP5401993B2 (ja) エンジンの排気浄化装置
JP2004308509A (ja) ディーゼルエンジン用排気浄化装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19859402

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19859402

Country of ref document: EP

Kind code of ref document: A1