WO2015001858A1 - Dispositif de fourniture d'agent réducteur et procédé de commande associé - Google Patents

Dispositif de fourniture d'agent réducteur et procédé de commande associé Download PDF

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Publication number
WO2015001858A1
WO2015001858A1 PCT/JP2014/063217 JP2014063217W WO2015001858A1 WO 2015001858 A1 WO2015001858 A1 WO 2015001858A1 JP 2014063217 W JP2014063217 W JP 2014063217W WO 2015001858 A1 WO2015001858 A1 WO 2015001858A1
Authority
WO
WIPO (PCT)
Prior art keywords
reducing agent
internal combustion
combustion engine
liquid reducing
heating
Prior art date
Application number
PCT/JP2014/063217
Other languages
English (en)
Japanese (ja)
Inventor
成弘 大野
Original Assignee
ボッシュ株式会社
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 ボッシュ株式会社 filed Critical ボッシュ株式会社
Priority to JP2015525089A priority Critical patent/JPWO2015001858A1/ja
Publication of WO2015001858A1 publication Critical patent/WO2015001858A1/fr

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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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/105—Control thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a reducing agent supply apparatus configured to supply a liquid reducing agent to an exhaust passage of an internal combustion engine, while being able to collect the liquid reducing agent in a storage tank when the internal combustion engine is stopped, and a control method thereof.
  • Nitrogen oxides are contained in exhaust gas discharged from internal combustion engines such as diesel engines.
  • an exhaust purification device used for purifying this NO x a selective reduction catalyst provided in an exhaust passage, and a reduction in which an aqueous urea solution is injected into the exhaust upstream of the selective reduction catalyst agent and a supply device
  • the SCR (Selective Catalytic Reduction) system for performing purification of the NO X known from ammonia urea solution is generated by decomposition.
  • the urea aqueous solution is collected in the storage tank when the internal combustion engine is stopped.
  • the key switch of the internal combustion engine is turned off, the reducing agent freezing prevention function provided in the reducing agent supply device is also stopped. Therefore, when the outside air temperature is extremely low, the urea aqueous solution The urea aqueous solution may freeze during the recovery control.
  • JP 2013-113267 A (paragraph 0054 etc.)
  • the present invention has been made to solve the conventional problems as described above, and provides a reducing agent for preventing the urea aqueous solution from freezing during the liquid reducing agent recovery control performed after the internal combustion engine is stopped.
  • An object is to provide a device and a control method thereof.
  • a control method for a reducing agent supply device configured to supply a liquid reducing agent to an exhaust passage of an internal combustion engine while allowing the liquid reducing agent to be collected in a storage tank when the internal combustion engine is stopped.
  • the temperature correlated with the outside air temperature is equal to or lower than a predetermined threshold, and the state of charge of the power supply source that supplies power to the heating means for heating the flow path of the liquid reducing agent is predetermined.
  • a control method of the reducing agent supply device is provided, which is characterized in that the heating means is operated when the temperature is equal to or greater than the threshold value, and the above-described problems can be solved.
  • the temperature and the state of charge are detected after the key switch of the internal combustion engine is turned off and the rotational speed of the internal combustion engine becomes zero. It is preferable.
  • Another aspect of the present invention is a reducing agent supply device configured to supply a liquid reducing agent to an exhaust passage of an internal combustion engine, and to recover the liquid reducing agent to a storage tank when the internal combustion engine is stopped.
  • Temperature detection means for detecting temperature
  • charge state detection means for detecting a charge state of a power supply source that supplies power to the heating means, wherein the heating control means is configured to recover the liquid reducing agent when the liquid reducing agent is recovered.
  • the reducing agent supply apparatus is characterized in that the heating means is operated when the temperature is equal to or lower than a predetermined threshold and the state of charge of the power supply source is equal to or higher than the predetermined threshold.
  • the key switch further includes a key-off detection unit that detects the key switch of the internal combustion engine being turned off, and a rotation speed detection unit that detects the rotation speed of the internal combustion engine. It is preferable that the heating control means determines whether or not the heating means needs to be operated after the engine is turned off and the rotational speed becomes zero.
  • the heating means is activated when the outside air temperature becomes low during the recovery control of the liquid reducing agent after the internal combustion engine is stopped, thereby preventing the liquid reducing agent from freezing. Can do.
  • the state of charge of the power supply source that supplies power to the heating unit is low, the operation of the heating unit is stopped, and thus protection of the power supply source is given priority.
  • FIG. 1 is a diagram shown to explain an example of the overall configuration of an exhaust purification device 10 that includes a reducing agent supply device 20.
  • the exhaust purification device 10 is a device for purifying NO x in exhaust gas, and is provided in an exhaust passage 11 of an internal combustion engine such as a diesel engine (not shown).
  • the exhaust purification device 10 includes a reduction catalyst 13 interposed in the middle of the exhaust passage 11 and a reducing agent supply device 20 for supplying a liquid reducing agent into the exhaust passage 11 upstream of the reduction catalyst 13. ing.
  • the reduction catalyst 13 is a catalyst having a function of promoting the reduction reaction of NO x in the exhaust, adsorbs the reducing component generated from the liquid reducing agent, and selects the NO x in the exhaust flowing into the catalyst by the reducing component. It is something to be reduced.
  • the reducing agent supply device 20 uses a urea aqueous solution as a liquid reducing agent, and ammonia as a reducing component is generated when the urea aqueous solution is decomposed in the exhaust passage 11.
  • An exhaust temperature sensor 15 is provided on the upstream side of the reduction catalyst 13 and further upstream of the injection position of the liquid reducing agent.
  • a reducing agent supply device 20 includes a storage tank 21 serving as a storage unit in which the liquid reducing agent is accommodated, a pump unit 22 for pumping the liquid reducing agent, and an exhaust passage for the liquid reducing agent. 11 and a reducing agent injection valve 25 for injecting the fuel into the inside.
  • the pump unit 22 includes a pump 23 and a flow path switching valve 24.
  • the reducing agent injection valve 25, the pump 23, and the flow path switching valve 24 are driven and controlled by an electronic control unit (ECU) 40.
  • ECU electronice control unit
  • the pump 23 and the storage tank 21 are connected by a first supply passage 31, and the pump 23 and the reducing agent injection valve 25 are connected by a second supply passage 33.
  • the second supply passage 33 is provided with a pressure sensor 27 for detecting the pressure in the second supply passage 33, that is, the pressure of the liquid reducing agent pumped to the reducing agent injection valve 25.
  • the pump 23 is connected to the first supply passage 31 and the second supply passage 33 via a flow path switching valve 24.
  • the flow path switching valve 24 has a direction in which the liquid reducing agent pumped by the pump 23 flows from the storage tank 21 side to the reducing agent injection valve 25 side (hereinafter referred to as “positive direction”), and a reducing agent injection valve. It has a function of switching from the 25 side to the direction of flowing to the storage tank 21 side (hereinafter referred to as “reverse direction”).
  • the flow path switching valve 24 communicates the first supply passage 31 to the suction side of the pump 23 and the second supply passage 33 to the discharge side of the pump 23 in a non-energized state, In the energized state, the first supply passage 31 is communicated with the discharge side of the pump 23 and the second supply passage 33 is communicated with the suction side of the pump 23.
  • the flow path switching valve 24 is not energized in order to supply the liquid reducing agent to the reducing agent injection valve 25 side. At this time, the liquid reducing agent flows in the positive direction.
  • the flow path switching valve 24 is energized when the liquid reducing agent in the reducing agent supply device 20 is collected in the storage tank 21. At this time, the liquid reducing agent flows in the reverse direction.
  • recover liquid reducing agents in the storage tank 21 is not restricted to the example which provides the flow-path switching valve 24.
  • the liquid reducing agent can be configured to be recoverable by using a pump 23 that can rotate in reverse.
  • a return passage 35 having the other end connected to the storage tank 21 is branched.
  • a throttle portion 36 having a reduced flow passage area is provided so that the pressure in the second supply passage 33 can be maintained.
  • the return passage 35 closer to the storage tank 21 than the throttling portion 36 is provided with a one-way valve 37 for preventing the liquid reducing agent from flowing from the storage tank 21 side to the second supply passage 33 side. Yes.
  • the one-way valve 37 may be omitted.
  • the pressure sensor 27 is provided in the pump unit 22, but at any position as long as the pressure in the second supply passage 33 can be detected. It does not matter.
  • the pump 23 pumps a liquid reducing agent at a predetermined flow rate by energization control by the ECU 40.
  • an electromagnetic pump is used as the pump 23, and the output (discharge flow rate) of the pump 23 increases as the drive duty ratio increases.
  • the pump 23 also has a function as a means for recovering the liquid reducing agent in the storage tank 21.
  • the reducing agent injection valve 25 is controlled to be opened and closed by energization control by the ECU 40 in an operating state of the internal combustion engine, and injects a predetermined amount of liquid reducing agent into the exhaust passage 11.
  • the reducing agent injection valve 25 is an electromagnetic on / off valve that closes in a non-energized state and opens in an energized state.
  • the reducing agent injection valve 25 is maintained in an open state when the liquid reducing agent is recovered when the internal combustion engine is stopped. Thereby, air (exhaust gas) is introduced into the second supply passage 33 through the nozzle hole of the reducing agent injection valve 25, and the liquid reducing agent is easily collected in the storage tank 21.
  • the reducing agent supply device 20 is provided with heating means for preventing the liquid reducing agent from freezing or for thawing the frozen liquid reducing agent.
  • the first supply passage 31, the second supply passage 33, the return passage 35, and the pump unit 22 are provided with electric heaters 19a, 19b, 19c, and 19d as heating means, respectively.
  • the electric heaters 19a, 19b, 19c, 19d are supplied with electric power from the electric power supply source 38, and the operation control is executed by the ECU 40.
  • the storage tank 21, the pump unit 22, and the reducing agent injection valve 25 are provided with cooling water passages 17 and 18 through which the cooling water of the internal combustion engine 1 can flow.
  • the cooling water flowing through the cooling water passages 17 and 18 is supplied by the cooling water circulation pump 5.
  • the cooling water is about 60 to 80 ° C., so that the liquid reducing agent can be heated by flowing the cooling water through the cooling water passages 17 and 18. That is, the heating means is also constituted by the cooling water circulation pump 5, the cooling water passages 17 and 18, and the cooling water.
  • the cooling water circulation pump 5 is supplied with electric power from an electric power supply source 38 and is operated by an ECU 40.
  • the configuration in which the electric heater and the cooling water circulate is an example of the heating means, and the arrangement position and configuration can be changed as appropriate, and further, other types of heating means can be employed.
  • the ECU 40 is configured around a known microcomputer, and includes key switch detection means, recovery control means, temperature detection means, charge state detection means, and heating control means. Specifically, each of these means is realized by executing a program by a microcomputer.
  • the ECU 40 includes a storage element such as a RAM or a ROM (not shown).
  • the key switch detection means detects on / off of the ignition switch of the internal combustion engine 1. Further, the recovery control means executes control to recover the liquid reducing agent remaining in the liquid reducing agent supply path into the storage tank 21 after the ignition switch is turned off.
  • the specific content of the control is not particularly limited, and can be implemented by an appropriate method.
  • the temperature detection means detects a temperature Te correlated with the outside air temperature.
  • the outside air temperature Te is directly detected based on the sensor signal of the outside air temperature sensor 39.
  • the temperature at a position where the temperature changes according to the change in the outside air temperature may be seen.
  • the charge state detection means detects the charge state SOC (Status of Charge) of the power supply source 38 that supplies power to the electric heaters 19a, 19b, 19c, and 19d as the heating means.
  • This state of charge SOC can be set to a value (%) representing, for example, a charging rate, and can be detected based on the detected values of voltage and current from the power supply source 38. Alternatively, the voltage itself of the power supply source 38 can be viewed.
  • the heating control means controls the operating states of the electric heaters 19a, 19b, 19c, 19d and the cooling water circulation pump 5 based on the temperature Te and the SOC correlated with the outside air temperature.
  • the ECU 40 of the present embodiment also functions as a heating control means, a recovery control means, a temperature detection means, and a charged state detection means of the present invention.
  • step S1 the ECU 40 determines whether or not the ignition switch of the internal combustion engine 1 has been turned off. While the ignition switch is on (No determination), step S1 is repeated.
  • step S2 the ECU 40 determines whether or not the engine speed Ne is zero. This step S2 is repeated until the engine speed becomes zero.
  • step S3 it is determined whether or not the value Te correlated with the outside air temperature is equal to or less than a predetermined threshold Te_0.
  • This threshold value Te_0 is used to determine whether or not the liquid reducing agent may be frozen during the liquid reducing agent recovery control, and directly compares the outside air temperature Te detected by the outside air temperature sensor 39. If so, it can be set as the freezing temperature + ⁇ of the liquid reducing agent. Alternatively, if a correlation value other than the outside air temperature is compared, a value corresponding to the value of the freezing temperature + ⁇ of the liquid reducing agent can be set as the threshold value Te_0.
  • step S4 it is determined whether or not the state of charge SOC of the power supply source 38 is equal to or greater than a predetermined threshold value SOC_0.
  • This threshold value SOC_0 is used to determine whether or not the charging state of the power supply source 38 may be reduced by continuing the operation of the heating means even when the internal combustion engine 1 is stopped.
  • an appropriate value is set, for example, 70% in terms of the charging rate.
  • step S5 When the state of charge SOC of the power supply source 38 is equal to or greater than the threshold SOC_0 (Yes determination), that is, when the outside air temperature is low and the state of charge of the power supply source 38 is sufficient, the process proceeds to step S5, where the ECU 40 The electric heaters 19a, 19b, 19c, 19d and the cooling water circulation pump 5 are operated.
  • the value Te correlated with the outside air temperature exceeds the threshold Te_0 in Step S3 (No determination) and there is no risk of freezing of the liquid reducing agent, or the charge state SOC of the power supply source 38 is less than the threshold SOC_0 in Step S4.
  • Yes No determination
  • the process proceeds to step S8 and the heating means is deactivated.
  • step S6 After determining whether the heating means is activated or deactivated, the process proceeds to step S6, and it is repeatedly determined whether or not the collection control is completed until the collection control of the liquid reducing agent is completed. (Determination) proceeds to step S7, the heating means is stopped, and this routine is terminated.
  • the reducing agent supply device 20 and the control method thereof according to the embodiment described so far are merely examples, and the configuration and control flow can be changed as appropriate within the scope of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un dispositif de fourniture d'agent réducteur et un procédé de commande associé permettant d'empêcher qu'une solution d'urée aqueuse ne gèle pendant la commande de récupération d'un agent réducteur liquide qui est exécutée après l'arrêt d'un moteur à combustion interne. Le procédé de commande d'un dispositif de fourniture d'agent réducteur est conçu de sorte qu'un agent réducteur liquide soit fourni à un canal d'échappement d'un moteur à combustion interne, et lorsque le moteur à combustion interne est arrêté, l'agent réducteur liquide peut être récupéré dans un réservoir d'accumulation, un moyen de chauffage permettant de chauffer un canal d'écoulement de l'agent réducteur liquide étant amené à fonctionner lors de la récupération de l'agent réducteur liquide si une température correspondant à la température de l'air extérieur est égale ou inférieure à une valeur seuil prédéterminée et si l'état de chargement d'une source de fourniture de puissance pour la fourniture de puissance au moyen de chauffage est égal ou supérieur à une valeur seuil prédéterminée.
PCT/JP2014/063217 2013-07-03 2014-05-19 Dispositif de fourniture d'agent réducteur et procédé de commande associé WO2015001858A1 (fr)

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Application Number Priority Date Filing Date Title
JP2015525089A JPWO2015001858A1 (ja) 2013-07-03 2014-05-19 還元剤供給装置及びその制御方法

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JP2013139363 2013-07-03
JP2013-139363 2013-07-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106285864A (zh) * 2016-10-26 2017-01-04 天纳克（苏州）排放***有限公司 具有单向节流功能的尿素管、尿素喷射***及其控制方法
CN108699941A (zh) * 2016-02-09 2018-10-23 考特克斯·特克斯罗恩有限公司及两合公司 用于储藏辅助液体及将辅助液体供给机动车内燃机或机动车内燃机部件的***

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114995549A (zh) * 2022-06-30 2022-09-02 上海三一重机股份有限公司 尿素加热控制方法、装置、***及作业机械

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JP2000027627A (ja) * 1998-07-13 2000-01-25 Hino Motors Ltd 排気ガス浄化触媒用還元剤保温装置及びそれを組込んだ排気ガス浄化装置
JP2002527660A (ja) * 1998-10-13 2002-08-27 クリーン ディーゼル テクノロジーズ インコーポレーテッド 選択的触媒作用による軽減のための温度制御尿素注入によるエンジンからのＮＯｘ放出物の軽減
JP2007113403A (ja) * 2005-10-18 2007-05-10 Nissan Diesel Motor Co Ltd 外気温度検出装置及び排気浄化装置
WO2010119711A1 (fr) * 2009-04-13 2010-10-21 ボッシュ株式会社 Dispositif d'épuration des gaz d'échappement pour véhicule
JP2011530672A (ja) * 2008-08-13 2011-12-22 エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング 還元剤ラインを選択的に加熱するための方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000027627A (ja) * 1998-07-13 2000-01-25 Hino Motors Ltd 排気ガス浄化触媒用還元剤保温装置及びそれを組込んだ排気ガス浄化装置
JP2002527660A (ja) * 1998-10-13 2002-08-27 クリーン ディーゼル テクノロジーズ インコーポレーテッド 選択的触媒作用による軽減のための温度制御尿素注入によるエンジンからのＮＯｘ放出物の軽減
JP2007113403A (ja) * 2005-10-18 2007-05-10 Nissan Diesel Motor Co Ltd 外気温度検出装置及び排気浄化装置
JP2011530672A (ja) * 2008-08-13 2011-12-22 エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング 還元剤ラインを選択的に加熱するための方法
WO2010119711A1 (fr) * 2009-04-13 2010-10-21 ボッシュ株式会社 Dispositif d'épuration des gaz d'échappement pour véhicule

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108699941A (zh) * 2016-02-09 2018-10-23 考特克斯·特克斯罗恩有限公司及两合公司 用于储藏辅助液体及将辅助液体供给机动车内燃机或机动车内燃机部件的***
CN108699941B (zh) * 2016-02-09 2021-10-22 考特克斯·特克斯罗恩有限公司及两合公司 用于储藏辅助液体及将辅助液体供给机动车内燃机或机动车内燃机部件的***
CN106285864A (zh) * 2016-10-26 2017-01-04 天纳克（苏州）排放***有限公司 具有单向节流功能的尿素管、尿素喷射***及其控制方法

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