US20050229589A1 - Exhaust gas purifying device for engine - Google Patents

Exhaust gas purifying device for engine Download PDF

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Publication number
US20050229589A1
US20050229589A1 US11/093,027 US9302705A US2005229589A1 US 20050229589 A1 US20050229589 A1 US 20050229589A1 US 9302705 A US9302705 A US 9302705A US 2005229589 A1 US2005229589 A1 US 2005229589A1
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United States
Prior art keywords
catalytic converter
purge
rich spike
exhaust gas
temperature
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.)
Abandoned
Application number
US11/093,027
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English (en)
Inventor
Minehiro Murata
Yasuhiro Tsutsui
Nobuhiro Kondo
Yoshinori Takahashi
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.)
Mitsubishi Fuso Truck and Bus Corp
Original Assignee
Mitsubishi Fuso Truck and Bus Corp
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Filing date
Publication date
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Assigned to MITSUBISHI FUSO TRUCK AND BUS CORPORATION reassignment MITSUBISHI FUSO TRUCK AND BUS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONDO, NOBUHIRO, MURATA, MINEHIRO, TAKAHASHI, YOSHINORI, TSUTSUI, YASUHIRO
Publication of US20050229589A1 publication Critical patent/US20050229589A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • 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
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F02D41/025—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur oxides
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • 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
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • 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
    • 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 an exhaust gas purifying device for an engine having an exhaust emission purifying function which purifies hazardous components included in the exhaust emission of an internal combustion engine, and particularly, it relates to a catalyst temperature rise control at the time of an S purge drive.
  • an exhaust gas purifying device provided with a NOx absorbing catalytic converter in an exhaust pipe of an engine is known.
  • a rich spike of lowering an excess air ratio of the gas provided into the catalytic converter (hereinafter referred to as “before catalyst ⁇ ”) to 1 or less by supplying a reducing agent such as light oil on an exhaust emission upstream side of a NOx reduction catalytic converter in order to discharge and reduce the absorbed NOx needs to be carried out regularly (for example, once a minute).
  • the rich spike is carried out by lowering ⁇ by controlling an engine intake system, post jetting, or the like as well as by jetting the fuel to the exhaust pipe on the upstream side of the catalytic converter.
  • the graphs H 1 to H 4 of FIG. 6 are graphs showing the change according to the time passage of the timing of a rich spike signal to execute a rich spike operation in the exhaust gas purifying device, the timing of an S purge signal to execute the S purge drive, a CO, HC supply amount to be supplied into the exhaust pipe and the catalyst temperature (the catalytic converter outlet gas temperature).
  • the rich spike operation and the S purge drive may be executed at the same time. Since both the rich spike operation and the S purge drive are executed by the HC supply by the exhaust light oil addition or the post jetting, the HC supply to the catalyst can be excessive depending on the timing so that the excessive temperature rise of the catalyst can be generated.
  • an object of the present invention is to provide an exhaust gas purifying device for an engine, capable of efficiently executing a rich spike control and an S purge drive and preventing an excessive temperature rise of a catalyst according to a rich spike operation.
  • the present invention provides an exhaust gas purifying device for an engine, comprising: a catalytic converter provided in an exhaust path of the engine which absorbs NOx in the exhaust gas flowing into the exhaust path and reduces the NOx when an air-fuel ratio of the exhaust gas becomes rich; a reducing agent supply unit which supplies a reducing agent component including HC into the exhaust path; a rich spike control unit which executes a rich spike operation that controls the air-fuel ratio temporarily to the rich side by operating the reducing agent supply unit per predetermined time period; an S purge control unit which judges whether or not an S purge drive that adds the HC component to the catalytic converter and eliminates a sulfur component absorbed in the catalytic converter by heating to a predetermined temperature or higher is needed; and a catalyst temperature measuring sensor which measures the temperature of the catalytic converter, wherein the rich spike control unit controls a operation cycle of the rich spike operation based on the deviation of the predetermined temperature with respect to the temperature measured by the catalyst temperature measuring sensor in the case where the S purge is judged to be
  • the present invention also provides an exhaust gas purifying device for an engine, comprising: a catalytic converter provided in an exhaust path of the engine which absorbs NOx in the exhaust gas flowing into the exhaust path and reduces the NOx when an air-fuel ratio of the exhaust gas becomes rich; a reducing agent supply unit which supplies a reducing agent component including HC into the exhaust path; a rich spike control unit which executes a rich spike operation that controls the air-fuel ratio temporarily to the rich side by operating the reducing agent supply unit per predetermined time period; an S purge control unit which judges whether or not an S purge drive that adds the HC component to the catalytic converter and eliminates a sulfur component absorbed in the catalytic converter by heating to a predetermined temperature or higher is needed; and a catalyst temperature measuring sensor which measures the temperature of the catalytic converter, wherein the rich spike control unit controls an operation period of the rich spike operation based on the deviation of the predetermined temperature with respect to the temperature measured by the catalyst temperature measuring sensor in the case where the S purge is judged to be
  • the rich spike control and the S purge drive can be executed efficiently and the excessive temperature rise of the catalyst according to the rich spike operation can be prevented.
  • FIG. 1 is a block diagram showing the configuration of an exhaust gas purifying device for an engine according to an embodiment of the present invention
  • FIG. 2 is a graph showing the relationship between a CO, HC supply amount per unit time and a catalyst temperature
  • FIG. 3 is a graph showing the relationship between a rich spike cycle and a rich spike period, and the CO, HC supply amount per unit time;
  • FIG. 4 is an explanatory graph showing the change according to the time passage of the timing of a rich spike signal in the exhaust gas purifying device for an engine, the timing of an S purge signal to execute the S purge drive, the CO, HC supply amount supplied into an exhaust gas piping, and a catalyst temperature (a catalytic converter outlet gas temperature);
  • FIG. 5 is an explanatory graph showing the change according to the time passage of the timing of the rich spike signal in the exhaust gas purifying device for an engine, the timing of the S purge signal to execute the S purge drive, the CO, HC supply amount supplied into the exhaust gas piping, and the catalyst temperature (the catalytic converter outlet gas temperature); and
  • FIG. 6 is an explanatory graph showing the change according to the time passage of the timing of the rich spike signal in a conventional exhaust gas purifying device, the timing of the S purge signal to execute the S purge drive, the CO, HC supply amount supplied into the exhaust gas piping, and the catalyst temperature (the catalytic converter outlet gas temperature).
  • FIG. 1 is a diagram showing the configuration of an exhaust gas purifying device for an engine 10 according to an embodiment of the present invention.
  • An engine system 10 comprises a diesel engine 20 .
  • the diesel engine 20 is connected to an intake pipe 30 on an intake side thereof and to an exhaust pipe 40 on an exhaust side thereof. Furthermore, the exhaust side of the diesel engine 20 and the intake pipe 30 are connected by an EGR piping 50 which circulates the exhaust gas (EGR gas) to the intake pipe 30 .
  • the reference numeral 60 in FIG. 3 denotes a supercharger and the reference numeral 100 denotes a control unit.
  • the intake pipe 30 is provided with an air flow sensor 30 , a compressor 61 of the supercharger 60 , an inter cooler 32 , an intake throttle 33 , and a connection part 34 with respect to the EGR piping 50 , in that order from the intake side.
  • the exhaust pipe 40 is provided with a turbine 62 of the supercharger 60 , an exhaust light oil adding injector 41 which supplies the light oil into the exhaust pipe 40 , and a NOx absorbing catalytic converter 42 , in that order from the diesel engine 20 sides.
  • the NOx absorbing catalytic converter 42 absorbs the NOx in the exhaust gas flowing into the exhaust pipe 40 and reduces the absorbed NOx at the time the exhaust gas becomes rich.
  • the EGR piping 50 is provided with an EGR cooler 51 which cools down the exhaust gas, and an EGR valve 52 which adjusts the exhaust gas flow amount, in that order form the exhaust pipe 40 sides.
  • the control unit 100 is connected to an output of a catalyst temperature measuring sensor 101 disposed on an outlet side of the NOx absorbing catalytic converter 42 of the exhaust pipe 40 such that the catalyst temperature of the NOx absorbing catalytic converter 42 is always fed back.
  • the S purge drive is executed by the following operation. That is, during the ordinary engine drive, the rich spike operation is executed by a predetermined interval by the combustion control of the engine and the addition of a light oil including the HC from the exhaust light oil adding injector 41 into the exhaust pipe 40 . At the time, if there is a command of the S purge drive, the temperature of the NOx absorbing catalytic converter 42 is raised by supplying the HC from the exhaust light oil adding injector 41 into the exhaust pipe 40 . At the time, in the case where the catalyst temperature does not reach an S purge temperature T, the rich spike operation is controlled such that the temperature rise speed is made higher, that is, the cycle of the rich spike operation (M in FIG. 4 ) is shortened.
  • the catalyst temperature reaches the S purge temperature T
  • the interval of the rich spike operation is returned to the original interval.
  • the catalyst temperature fluctuates around the S purge temperature T without having the excessive temperature rise.
  • the rich spike cycle may be controlled so as to be made longer. At the time the S purge drive is finished so as to return to the ordinary engine drive, the rich spike operation is returned to the ordinary cycle.
  • the HC supply is increased by shortening the rich spike cycle according to the increase of the deviation of the catalyst temperature with respect to the S purge temperature T so as to control the catalyst temperature such that it reaches the S purge temperature T in a short time.
  • this denotes that the catalyst temperature rise amount can consequently be made larger by shortening the rich spike cycle so as to increase the CO, HC supply amount per unit time. Therefore, while executing the rich spike, the sulfur component absorbed by the NOx absorbing catalytic converter 42 can be eliminated smoothly by the S purge drive as well as the excessive temperature rise can be prevented.
  • the graphs L 1 to L 4 of FIG. 5 are graphs showing the change according to the time passage of the timing of a rich spike signal to execute a rich spike operation in an exhaust gas purifying device for an engine according to a modified embodiment of the engine system 10 , the timing of an S purge signal to execute an S purge drive, a CO, HC supply amount supplied into an exhaust gas piping, and a catalyst temperature (a catalytic converter outlet gas temperature).
  • a rich spike period time for executing the rich spike per one time
  • the rich spike operation is executed by a predetermined interval for a certain period during the ordinary engine drive.
  • the temperature of a NOx absorbing catalytic converter 42 is raised by supplying the HC in an exhaust pipe 40 .
  • the rich spike operation is controlled such that the temperature rise speed is made higher, that is, the period of the rich spike operation (N in FIG. 5 ) is prolonged.
  • the rich spike period When the catalyst temperature reaches the S purge temperature T, the rich spike period returns to the original length. Thereby, the catalyst temperature fluctuates around the S purge temperature T without having the excessive temperature rise.
  • the rich spike period may be controlled so as to be made shorter.
  • the S purge drive is finished so as to return to the ordinary engine drive, the rich spike period is returned to the ordinary length. Also in this modified embodiment, the same effect as in the case of controlling the rich spike cycle as mentioned above can be obtained.
  • the present invention is not limited to the above-mentioned embodiments.
  • the rich spike cycle or the rich spike period is controlled in the embodiments mentioned above, they may be controlled at the same time.
  • Naturally various modifications can be executed without departing from the scope of the gist of the present invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
US11/093,027 2004-03-31 2005-03-29 Exhaust gas purifying device for engine Abandoned US20050229589A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-107807 2004-03-31
JP2004107807A JP2005291100A (ja) 2004-03-31 2004-03-31 エンジンの排ガス浄化装置

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US20050229589A1 true US20050229589A1 (en) 2005-10-20

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US (1) US20050229589A1 (de)
JP (1) JP2005291100A (de)
KR (1) KR100629205B1 (de)
CN (1) CN1676892A (de)
DE (1) DE102005014873A1 (de)

Cited By (7)

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US20080179414A1 (en) * 2007-01-30 2008-07-31 Rainer Bentz Heating device for heating a storage device for a complex salt and method and device for operating the heating device
US20090199548A1 (en) * 2006-08-30 2009-08-13 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification system and method for internal combustion engine
US20090277159A1 (en) * 2008-05-12 2009-11-12 Caterpillar Inc. Selective Catalytic Reduction Using Controlled Catalytic Deactivation
GB2478721A (en) * 2010-03-15 2011-09-21 Gm Global Tech Operations Inc Method for managing a desulphurization phase of a catalyst device
US8650863B2 (en) 2009-03-31 2014-02-18 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification system for an internal combustion engine
US10683785B2 (en) * 2017-12-27 2020-06-16 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification apparatus for an internal combustion engine
US10704439B2 (en) * 2017-12-27 2020-07-07 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification apparatus for an internal combustion engine

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US20090199547A1 (en) * 2008-02-08 2009-08-13 Gm Global Technology Operations, Inc. Method and apparatus for exhaust aftertreatment in a spark-ignition direct-injection internal combustion engine
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JP2005291100A (ja) 2005-10-20

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