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WO2011070687A1 - Dispositif de détection d'un composé sulfuré - Google Patents

Dispositif de détection d'un composé sulfuré Download PDF

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Publication number
WO2011070687A1
WO2011070687A1 PCT/JP2009/070934 JP2009070934W WO2011070687A1 WO 2011070687 A1 WO2011070687 A1 WO 2011070687A1 JP 2009070934 W JP2009070934 W JP 2009070934W WO 2011070687 A1 WO2011070687 A1 WO 2011070687A1
Authority
WO
WIPO (PCT)
Prior art keywords
amount
holding
exhaust gas
sulfur component
holding unit
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2009/070934
Other languages
English (en)
Japanese (ja)
Inventor
西岡寛真
塚本佳久
押川克彦
大月寛
松尾潤一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to EP09852083.6A priority Critical patent/EP2511697A4/fr
Priority to JP2011514917A priority patent/JP5477381B2/ja
Priority to PCT/JP2009/070934 priority patent/WO2011070687A1/fr
Priority to US13/255,009 priority patent/US8695399B2/en
Priority to CN200980162792.XA priority patent/CN102667460B/zh
Publication of WO2011070687A1 publication Critical patent/WO2011070687A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/0042—SO2 or SO3
    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • F02D41/028—Desulfurisation of NOx traps or adsorbent
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
    • G01N25/4873—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a flowing, e.g. gas sample
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0818—SOx storage amount, e.g. for SOx trap or NOx trap
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present invention relates to a sulfur component detection apparatus.
  • An SO X concentration sensor for detecting the SO X concentration in exhaust gas is known.
  • a general SO X concentration sensor measures an electromotive force generated when SO X changes to sulfate ions in a solid electrolyte, and detects the SO X concentration in the exhaust gas.
  • the SO X concentration sensor for detecting the SO X concentration in such instant when the low SO X concentration in the exhaust gas, it is difficult to detect an accurate SO X concentration.
  • a sulfur component detection device that cannot detect the instantaneous SO X concentration in the exhaust gas but can detect the integrated amount of SO X that has passed through the exhaust gas passage during a certain period. (See Patent Document 1).
  • the sulfur component detecting device has a stored SO X material for holding the SO X contained in the exhaust gas, electricity stored SO X material which changes with increasing SO X amount held in the stored SO X material resistance, volume, or the characteristics of the heat capacity such measures, and to detect the cumulative amount of sO X passing through the exhaust gas passage during a period of time from the measured properties.
  • an object of the present invention is to provide a sulfur component detection device capable of detecting a cumulative amount of SO X that has passed through an exhaust gas passage during a certain period or a value based on this cumulative amount relatively accurately. is there.
  • Sulfur component detecting device as claimed in claim 1 according to the present invention, an exhaust gas passage through the holding the SO X and NO X in the exhaust gas, SO X held amount the NO X holding possible amount decreases as increasing A holding unit, estimating the SO X holding amount based on the NO X holding amount held in the holding unit, and obtaining the integrated amount or the integrated amount of SO X that has passed through the exhaust gas passage for a certain period of time; in sulfur component detecting device for detecting a value based on an estimate of the stored SO X amount of accumulated amount, or for detecting a value based on the integrated amount of the SO X is the current to the holding unit the NO X holding possible amount of It is prohibited when NO X is not held.
  • the sulfur component detection device is the sulfur component detection device according to claim 1, wherein the SO X integrated amount or the SO X retention amount for detecting a value based on the integrated amount is detected. This estimation is prohibited when the temperature of the holding part is outside the set temperature range.
  • the sulfur component detection device according to claim 3 of the present invention is the sulfur component detection device according to claim 2, wherein the current NO X holdable amount of the holding portion is maximized within the set temperature range. The temperature of the holding part is included.
  • a sulfur component detection device is the sulfur component detection device according to the first aspect, wherein when all the NO X and SO X held in the holding portion are released, a set interval is set.
  • the sulfur component detection device is the sulfur component detection device according to any one of claims 1 to 4, wherein the holding portion holds NO X in the exhaust gas as nitrate. And oxygen is supplied in the vicinity of the holding portion.
  • the sulfur component detecting device as claimed in claim 1 according to the present invention, it holds the SO X and NO X in the exhaust gas passing through the exhaust gas passage, the higher the NO X holding amount capable stored SO X amount increases Since the holding unit is decreased, the SO X holding amount can be estimated based on the NO X holding amount held in the holding unit, and a certain ratio of the SO X amount passing through the exhaust gas passage is a sulfur component detection device.
  • the integrated amount of SO X that has passed through the exhaust gas passage for a certain period or a value based on the integrated amount is detected Can do.
  • estimation of the stored SO X amount for detecting a value based on the integrated amount or integrated amount of SO X it is necessary to NO X in the current of the NO X holdable amount is held in the holder , If the stored SO X amount based on the nO X holding amount is estimated when the nO X in the current of the nO X holdable amount holding unit is not retained, stored SO X amount estimated is made larger than the actual End up. Thereby, the estimation of the SO X accumulated amount or the SO X retention amount for detecting the value based on the accumulated amount is prohibited when the current NO X retention amount NO X is not retained in the retaining portion. It is like that.
  • the current NO X holdable amount of the holding portion varies depending on the temperature of the holding portion.
  • the estimated Since the SO X retention amount becomes larger (or less) than the actual amount the estimation of the SO X retention amount for detecting the integrated amount of SO X or a value based on the integral amount is performed by setting the temperature of the retaining portion to the set temperature. It is prohibited when it is out of range.
  • the current NO X holdable amount of the holding portion is maximized within the set temperature range.
  • the temperature of the holding part is included.
  • the NO X holding amount detected is when the maximum The value is set to the current NO X holdable amount of the holding unit when SO X is not held.
  • the SO X retention amount can be estimated relatively accurately based on the NO X retention amount of the retention portion.
  • the holding unit holds NO X in the exhaust gas as nitrate. Therefore, when oxygen is supplied in the vicinity of the holding part, NO in the exhaust gas is oxidized to NO 2 by the supplied oxygen, and then is easily held as nitrate in the holding part.
  • FIG. 1 is a schematic view showing an engine exhaust system in which a sulfur component detection device according to the present invention is arranged.
  • 1 is an exhaust gas passage of an internal combustion engine.
  • the internal combustion engine is an internal combustion engine that performs lean combustion, such as a diesel engine or a direct injection spark ignition internal combustion engine.
  • the exhaust gas of such an internal combustion engine in order to contain a relatively large amount of NO X, in the exhaust gas passage 1, NO X catalyst device 2 for purifying NO X is arranged.
  • the NO X catalyst device 2 carries a NO X holding material and a noble metal catalyst such as platinum Pt.
  • the NO X holding material is at least selected from an alkali metal such as potassium K, sodium Na, lithium Li, and cesium Cs, an alkaline earth metal such as barium Ba and calcium Ca, and a rare earth such as lanthanum La and yttrium Y.
  • an alkali metal such as potassium K, sodium Na, lithium Li, and cesium Cs
  • an alkaline earth metal such as barium Ba and calcium Ca
  • a rare earth such as lanthanum La and yttrium Y.
  • NO X cannot be held indefinitely, and as a regeneration process, the air-fuel ratio of the exhaust gas is reduced before the NO X hold amount reaches the NO X holdable amount and can no longer hold NO X.
  • the stoichiometric air-fuel ratio or rich air-fuel ratio is set, that is, the oxygen concentration in the exhaust gas is reduced.
  • the retained NO X is desorbed, that is, the absorbed NO X is released, and the adsorbed NO 2 is desorbed, and the desorbed NO X is reduced and purified to N 2 by the reducing substance in the exhaust gas.
  • an S trap device 3 for storing SO X in the exhaust gas is disposed upstream of the NO X catalyst device 2 in the exhaust gas passage 1 to suppress S poisoning of the NO X catalyst device 2.
  • the sulfur component detection device 4 according to the present invention is disposed, for example, between the S trap device 3 and the NO X catalyst device 2 to detect the integrated amount of SO X passing through the S trap device 3, and this integrated amount is set.
  • FIG. 2 is a schematic cross-sectional view showing an embodiment of the sulfur component detection device 4 according to the present invention.
  • reference numeral 10 denotes an outer wall of the exhaust gas passage 1.
  • 41 is a substrate of the sulfur component detection device 4.
  • a temperature sensor 42 such as a thermocouple is disposed on one side of the substrate 1 (preferably on the exhaust upstream side).
  • An electric heater 43 is arranged on the other side of the substrate 1.
  • Reference numeral 44 denotes a NO X and SO X holding portion arranged so as to cover the temperature sensitive portion of the temperature sensor 42.
  • Reference numeral 45 denotes a cylindrical case that surrounds the sulfur component detection device 4 thus configured and penetrates the outer wall 10 of the exhaust gas passage 1.
  • a plurality of opening holes 45 a are formed in the case 45, and exhaust gas passing through the exhaust gas passage 1 flows into the case 45 through the opening holes 45 a.
  • Reference numeral 46 denotes an oxygen pump for supplying oxygen (for example, oxygen in the atmosphere) to the vicinity of the holding portion 44 in the case 45.
  • the oxygen pump 46 is positioned around the integrated temperature sensor 42, the substrate 41, and the electric heater 43. The space around the holding portion 44 in 45 is separated from the atmospheric chamber.
  • the oxygen pump 46 is formed of zirconia or the like, and is capable of moving oxygen in the atmosphere to the vicinity of the holding portion 44 in the case 45 by applying a voltage in reverse to the zirconia oxygen concentration sensor.
  • the holding unit 44 holds NO X and SO X in the exhaust gas.
  • the holding unit 44 applies the above-described NO X holding material and a noble metal catalyst such as platinum Pt to the temperature sensing unit of the temperature sensor 42. Can be formed.
  • the holding portion 44 formed in this manner stores NO X in the exhaust gas as nitrate, and stores SO X in the exhaust gas as sulfate instead of NO X.
  • Holding unit 44 depending on the amount of the NO X holding material, SO X has the the NO X holding possible amount B when not held (or holdable amount of the NO X and SO X), as compared to nitrate Since sulfate is a stable substance, the current NO X retention amount decreases as the SO X retention amount increases with reference to the NO X retention amount B when SO X is not retained. It will be. Based on this relationship, the accumulated amount of SO X that has passed through the exhaust gas passage 1 at the position of the sulfur component detection device 4 during a certain period, or a value based on the accumulated amount of SO X during the certain period.
  • FIG. 3 is a flowchart for detecting the integrated amount of SO X or a value based on the integrated amount by the sulfur component detecting device 4, and is implemented in an electronic control device (not shown).
  • step 101 whether the detection timing of the integrated amount of SO X is determined. Although it ends when this determination is negative, if needed to detect the cumulative amount of regularly or irregularly SO X, the determination in step 101, the process proceeds it is affirmative to step 102.
  • step 102 it is determined whether or not an elapsed time t, which will be described later in detail, has reached a set time t ', and this determination is repeated until affirmative. If the determination in step 102 is affirmed, the temperature T of the holding unit 44 of the sulfur component detection device 4 is measured by the temperature sensor 42 in step 103, and the measured temperature T is set to the first set temperature T1 (for example, 350 ° C. to 380 °). C) It is determined whether or not the temperature is within the set temperature range of the second set temperature T2 (400 ° C. to 430 ° C.) or less. This determination is also repeated until affirmative.
  • the electric heater 43 may be operated so that the determination in step 103 is affirmed. In addition, the electric heater 43 may be operated as necessary so that the temperature T of the holding unit 44 is always maintained within a set temperature range (T1 or more and T2 or less). If the determination in step 103 is affirmative, the air-fuel ratio of the exhaust gas in the vicinity of the holding unit 44 is made rich to reduce the oxygen concentration in the vicinity of the holding unit 44. Thereby, NO X is released from the holding portion 44 and reduced as follows.
  • the temperature rise value ⁇ T (Ta ⁇ Tb) is measured by the temperature sensor 42, and in step 104, the NO X retention amount A (mol) held in the holding portion 44 is detected based on the temperature rise value ⁇ T.
  • the air-fuel ratio of the exhaust gas is returned to lean during normal operation.
  • the NO X holding possible amount B from the NO X holding amount A of the holding portion 44 when the SO X is not held is small, it becomes the SO X is held in the holding section 44, at step 105, The current SO X retention amount (B ⁇ A) is estimated.
  • step 106 Based on the fact that a fixed ratio of the SO X amount passing through the exhaust gas passage 1 at the position of the sulfur component detection device 4 is held in the holding unit 44 of the sulfur component detection device 4, in step 106, the current SO X hold amount is set. Based on this, the integrated amount of SO X that has passed through the exhaust gas passage 1 at the position of the sulfur component detection device 4 during a certain period is detected.
  • step 107 the elapsed time t is reset to 0, and the process ends.
  • the NO X holding amount A of the holding unit 44 detected in step 104 is determined by holding the SO X.
  • the holding unit 44 holds the current NO X holding amount. It is necessary that a possible amount of NO x is retained. If the stored SO X amount based on the NO X holding amount when the NO X in the current of the NO X holdable amount holding unit is not retained is estimated, stored SO X amount estimated is made larger than the actual End up. In this flowchart, when the elapsed time t has not reached the set time t ′, the determination in step 102 is negative because there is a possibility that the current NO X holdable amount of NO X may not be held in the holding unit 44.
  • the processing after step 103 including the estimation of the SO X retention amount for detecting the SO X integrated amount is prohibited (not implemented).
  • the elapsed time t is set to 0 when the internal combustion engine is started for the first time, and is reset to 0 in step 107 of this flowchart. In other cases, the elapsed time t is reset to 0 when all NO X is released from the holding unit 44. For example, in the regeneration process of the NO X catalyst device 2, the air-fuel ratio of the exhaust gas is rich, since all of the NO X is released from the holding portion 44, to zero the elapsed time t at the end of the reproduction process Reset.
  • the current NO X holdable amount of the holding unit 44 varies depending on the temperature of the holding unit 44.
  • the holding portion 44 formed from the NO X holding material (Ba) as illustrated in FIG. 4 as an example of the NO X holdable amount B when the SO X is not held, the NO X with respect to each SO X holding amount.
  • the amount of X that can be held increases most when the temperature of the holding portion 44 is T1 (350 ° C to 380 ° C), and the temperature of the holding portion 44 is from T1 to T2 (400 ° C to 430 ° C). Remains relatively high when it is between.
  • the temperature of the holding portion 44 when detecting the current of the NO X holdable amount A of the holding portion 44 It is preferable to make T coincide with the set temperature of the holding unit 44 that provides the NO X holdable amount B when the SO X determined as the reference is not held.
  • the temperature T of the holding portion 44 when a set temperature range including the set temperature, it is preferable to prohibit the stored SO X amount estimation to detect the cumulative amount of SO X.
  • the stored SO X amount based on the NO X holding amount when the temperature T is the NO X holding amount capable by the temperature change of the holding portion 44 becomes the set temperature range has been reduced in the holding portion 44 is estimated, the estimated In addition, the SO X retention amount becomes larger than the actual amount.
  • step 104 including the stored SO X amount estimation to detect the cumulative amount of SO X Subsequent processing is prohibited (not implemented).
  • the set temperature of the holding unit 44 that provides the NO X holdable amount B when the SO X determined as the reference is not held is set to 350 ° C., for example, and the NO X holdable amount B is maximized.
  • the set temperature range of step 103 preferably includes the temperature of the holding unit (for example, 350 ° C.) that maximizes the current NO X holdable amount of the holding unit.
  • the holding unit 44 of the sulfur component detection device 4 holds NO X in the exhaust gas as nitrate as in the present embodiment
  • NO is oxidized to NO 2 by the supplied oxygen, and then is easily held in the holding unit 44 as nitrate.
  • the oxygen pump 46 is operated to supply oxygen to the vicinity of the holding portion 44 and NO in the exhaust gas is held in the holding portion 44.
  • the air-fuel ratio of the exhaust gas in the vicinity of the holding portion 44 is about 40 or more.
  • the current NO X holdable amount with respect to each SO X hold amount of the holding unit 44 gradually decreases due to deterioration.
  • the holding portion when the SO X be defined as a reference is not held NO X It is necessary to update the holdable amount B to the current value. If the holding unit 44 deteriorates and the current NO X holdable amount of the holding unit decreases, if the SO X holding amount is estimated with the reference as it is, the estimated SO X holding amount is larger than the actual amount. turn into.
  • FIG. 5 is a flowchart for updating the NO X holdable amount when the SO X used as the reference is not held, and is implemented in the electronic control unit.
  • the holding unit 44 is intended to detect the integrated amount of SO X that has passed through the exhaust gas passage 1 at the position of the sulfur component detection device 4 during a new fixed period, or a value based on the integrated amount of SO X. It may be required to reset the SO X retention amount to zero. In step 201, in such a case, it is determined whether or not the release of all SO X from the holding unit 44 has been completed.
  • the air-fuel ratio of the exhaust gas is made rich to reduce the oxygen concentration in the vicinity of the holding unit 44, and the temperature of the holding unit 44 is raised to a high temperature (for example, 650 ° C.). It is necessary to.
  • the reducing substance in the exhaust gas may be oxidized using the noble metal catalyst of the holding unit 44 to increase the temperature of the holding unit 44, but the temperature of the holding unit 44 may be increased by the electric heater 43.
  • NO X held as a nitrate that is more unstable than the sulfate is also released from the holding unit 44.
  • step 201 When the determination in step 201 is negative, the process is terminated as it is. However, when the determination in step 201 is affirmative, the elapsed time t is reset to 0 in step 202 as described in the flowchart of FIG. Next, in step 203, it is determined whether or not the elapsed time t has reached the set time interval ts, and this determination is repeated until affirmative. If the determination in step 203 is affirmative, at step 204, is the NO X holding amount A held in the holding unit 44 in the time interval setting ts is detected by the rich air-fuel ratio of as before the exhaust gases.
  • step 205 it is determined whether or not the NO X retention amount A detected this time is substantially equal to the NO X retention amount A ′ detected last time. Initially, for the NO X holding amount A which is previously detected 'is 0, the determination in step 205 proceeds denied to step 206. In step 206, the NO X retention amount A detected this time is set as the NO X retention amount A ′ detected last time. Next, in step 207, the set time interval ts described above is increased by a, and the process returns to step 202.
  • the NO X retention amount A of the holding unit 44 detected in this way is a short time (several minutes or several tens of minutes) after the release of all NO X and SO X held in the holding unit 44.
  • the NO X retention amount A detected this time is set as the current NO X retention amount B of the retention unit 44 when SO X is not retained.
  • step 209 the previously detected NO X retention amount A ′ is reset to 0, and the process ends.
  • the current NO X holdable amount B of the holding unit 44 when the reference SO X is not held is updated, and the SO X holding amount (B ⁇ A) of the holding unit 44 in step 105 of the flowchart of FIG. 3 is updated.
  • the elapsed time t during which the holding unit 44 holds NO X may be a travel distance.
  • the temperature rise value of the holding portion 44 by the air-fuel ratio of the exhaust gas rich for detecting the NO X holding amount A of the holding portion 44 is to be measured, which is intended to limit the present invention
  • NO X held in the holding unit 44 is released even if the oxygen concentration is not lowered if the temperature of the holding unit is about 500 ° C.
  • heating the holding portion 44 by the electric heater 43, the holding portion 44 on the basis of the amount of heat used to release all NO X, so as to detect the NO X holding amount A of the holding portion 44 May be.
  • the combustion air-fuel ratio of the internal combustion engine is made rich, the exhaust stroke or the expansion stroke
  • additional fuel may be supplied into the cylinder, or fuel may be supplied into the exhaust gas in the exhaust gas passage 1.

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Abstract

L'invention concerne un dispositif de détection d'un composé sulfuré, comportant une partie de rétention conçue pour retenir les SOX et les NOX présents dans un gaz d'échappement traversant un passage de gaz d'échappement, et dont la capacité de rétention des NOX diminue lorsque sa capacité de rétention des SOX augmente. La quantité de SOX retenus est estimée en fonction de la quantité de NOX retenus dans la partie de rétention pour détecter ainsi la quantité cumulée de SOX, ou une valeur fonction de celle-ci, qui a traversé le passage de gaz d'échappement au sein d'un intervalle de temps défini. Si la quantité de NOX retenue dans la partie de rétention n'atteint pas un niveau susceptible d'être retenu à ce moment, l'estimation (étape (105)) de la quantité de SOX retenus compte tenu de la quantité cumulée de SOX ou d'une valeur fonction de celle-ci est alors inhibée (étape (102)).
PCT/JP2009/070934 2009-12-09 2009-12-09 Dispositif de détection d'un composé sulfuré Ceased WO2011070687A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09852083.6A EP2511697A4 (fr) 2009-12-09 2009-12-09 Dispositif de détection d'un composé sulfuré
JP2011514917A JP5477381B2 (ja) 2009-12-09 2009-12-09 硫黄成分検出装置
PCT/JP2009/070934 WO2011070687A1 (fr) 2009-12-09 2009-12-09 Dispositif de détection d'un composé sulfuré
US13/255,009 US8695399B2 (en) 2009-12-09 2009-12-09 Detector for detecting sulfur components
CN200980162792.XA CN102667460B (zh) 2009-12-09 2009-12-09 硫磺成分检测装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/070934 WO2011070687A1 (fr) 2009-12-09 2009-12-09 Dispositif de détection d'un composé sulfuré

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WO2011070687A1 true WO2011070687A1 (fr) 2011-06-16

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US (1) US8695399B2 (fr)
EP (1) EP2511697A4 (fr)
JP (1) JP5477381B2 (fr)
CN (1) CN102667460B (fr)
WO (1) WO2011070687A1 (fr)

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Publication number Priority date Publication date Assignee Title
US8555699B2 (en) * 2010-05-12 2013-10-15 Toyota Jidosha Kabushiki Kaisha Detector for detecting sulfur components
WO2015004846A1 (fr) * 2013-07-12 2015-01-15 Toyota Jidosha Kabushiki Kaisha Dispositif de détection de la concentration en sox d'un moteur à combustion interne
JP6235270B2 (ja) * 2013-08-23 2017-11-22 株式会社Ｓｏｋｅｎ 内燃機関の制御装置および制御方法

Citations (2)

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CN102667460A (zh) 2012-09-12
JP5477381B2 (ja) 2014-04-23
US8695399B2 (en) 2014-04-15
EP2511697A4 (fr) 2016-11-02
JPWO2011070687A1 (ja) 2013-04-22
US20120279278A1 (en) 2012-11-08
EP2511697A1 (fr) 2012-10-17

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