CN1676893A - Exhaust gas cleaning device - Google Patents

Exhaust gas cleaning device Download PDF

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Publication number
CN1676893A
CN1676893A CNA200510059868XA CN200510059868A CN1676893A CN 1676893 A CN1676893 A CN 1676893A CN A200510059868X A CNA200510059868X A CN A200510059868XA CN 200510059868 A CN200510059868 A CN 200510059868A CN 1676893 A CN1676893 A CN 1676893A
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CN
China
Prior art keywords
temperature
reducing agent
catalyzer
unit
fuel ratio
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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.)
Pending
Application number
CNA200510059868XA
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Chinese (zh)
Inventor
村田峰启
筒井泰弘
近藤畅宏
高桥嘉则
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
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
Priority claimed from JP2004105886A external-priority patent/JP2005291059A/en
Priority claimed from JP2004105849A external-priority patent/JP2005291058A/en
Application filed by Mitsubishi Fuso Truck and Bus Corp filed Critical Mitsubishi Fuso Truck and Bus Corp
Publication of CN1676893A publication Critical patent/CN1676893A/en
Pending 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
    • 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
    • F02D41/04—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
    • 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
    • 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
    • F01N3/0807—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
    • 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
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine 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
    • 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

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

Abstract

An exhaust cleaning device includes a NOx storage reduction catalyst storing NOx when an air-fuel ratio of an inflowing exhaust gas is lean and releasing the stored NOx when the air-fuel ratio of the inflowing exhaust gas is rich; an air-fuel ratio changing unit; a reducing agent supplying unit which adds a reducing agent to the NOx storage reduction catalyst; a temperature detection unit which detects a temperature of the NOx storage reduction catalyst; a poisoning recovery timing judging unit which judges a timing for executing a SOx poisoning recovery process of releasing SOx from the NOx storage reduction catalyst; and a control unit.

Description

Off-gas cleaning equipment
Technical field
The present invention relates to the off-gas cleaning equipment of a kind of harmful components that waste gas contained that are used for removing internal-combustion engine and particulate etc.
Background technique
But, in the exhaust passage of its motor, be equipped with to have purifying nitrogen oxide (NO for such as internal-combustion engine operated with lean mixture such as diesel engines x) NO of waste gas function xCatalyzer, the mixed gas (poor atmosphere gas) that has a high air-fuel ratio by burning in described internal-combustion engine moves motor in very wide operating range.As NO xCatalyzer for example can adopt following catalyzer, will have storage NO in described catalyzer in the presence of oxygen xThe NO of ability xStorage agent and noble metal catalyst combination load with the ability that makes hydro carbons (HC) oxidation are on by carriers that constitute and that have cellular structure such as porous ceramics.
When being not less than chemically correct fuel, the air fuel ratio of waste gas (hereinafter this state is called " poor " attitude), NO xCatalyzer has storage NO xCharacter, and when the air fuel ratio of waste gas is not more than chemically correct fuel, (hereinafter this state is called " richness " attitude), described catalyzer has release NO xCharacter.When with NO xBe released into when having HC, CO etc. in waste gas and the waste gas, because noble metal catalyst can promote the oxidation reaction of HC and CO, thereby redox reaction can take place between mentioned component, NO wherein xAs oxidizing component, and HC and CO are as the reduction composition.Thus HC and CO are oxidized to CO 2And H 2O, and with NO xBe reduced to N 2
Even when waste gas is in poor attitude, if NO xCatalyzer has been stored the NO of preset limit amount x, NO then xCatalyzer will no longer be stored more NO xTherefore, usually at NO xNO in the catalyzer xThe memory space amount of reaching capacity before, repeat recovery operation control with predetermined interval, by described recovery operation control, supply with NO in the exhaust passage by the reducing agent feed unit xThe upstream side of catalyzer is stored in NO as the reducing agents such as light oil of fuel with release xNO in the catalyzer xAnd with its reduction purification, thereby regeneration NO xThe NO of catalyzer xStorage capacity.
Yet,, therefore be derived from the oxysulfide (SO of these sulphur compositions in the fuel owing in the fuel (light oil) of internal-combustion engine, contain the sulphur composition x) and NO xBe present in the waste gas together.Because NO xCatalyzer also can be stored the SO that exists in the waste gas xEven, and be in the NO that is suitable for discharging in the catalyzer and is stored xCondition under (under the condition of rich waste gas), described SO xAlso be difficult for from catalyzer, discharging, so when the motor continuous service, the SO in the waste gas xBe stored in NO gradually xCause S (sulphur) to poison in the catalyzer.
Be stored in NO as decomposing effectively and remove xParticulate in the catalyzer and SO xMethod, known have such operation to control (hereinafter referred to as " sulfur poisoning recovers control "): wherein increase the fuel injection amount to motor, reduce gettering quantity simultaneously with the air fuel ratio that increases waste gas and make it be slightly larger than chemically correct fuel (stoichiometric proportion), and fuel is added to NO by the reducing agent feed unit xIn the exhaust passage of catalyzer upstream with NO xThe temperature of catalyzer increases to for example 600 ℃ or higher target temperature.Recover control by carrying out this sulfur poisoning, be adjusted to stoichiometric proportion or be slightly larger than reduction composition in the waste gas of stoichiometric proportion, just can under high temperature condition, decompose and remove the SO that is stored in the catalyzer xYet, even the reduction composition in waste gas is removed the SO that is stored in the catalyzer xDeng the time because the reaction heat of reduction composition continues catalyzer is heated, so catalyzer will excessively heat up and surpass the limiting temperature of catalyzer or catalyst carrier.
Although use NO xThe stored type catalyzer can be stored NO when poor air fuel ratio is controlled xIf, but continue the fuel-lean combustion operation for a long time, then because the NO of catalyzer xThere is the upper limit in memory space, works as NO xWhen memory space reaches capacity, the NO in the waste gas xTo no longer be stored in the catalyzer and be released in the atmosphere.Therefore at NO xBefore the memory space of stored type catalyzer reaches capacity, should implement wherein regularly to switch to the operation of the so-called rich spike (rich spike) of rich air-fuel ratio operation, the control air fuel ratio makes it be not more than chemically correct fuel in described operation.
Disclosed among the JP-A-2001-304011 and worked as NO xWhen being not less than predetermined temperature, the temperature of stored type catalyzer sets the air fuel ratio of waste gas gradually towards portly side.
Although NO xEven the stored type catalyzer also can be stored NO when temperature is less than or equal to reducible temperature xIf, but to NO xThe stored type catalyzer carries out the temperature that sulfur poisoning recovers rising catalyzer in the process of control, then because thermal dissociation, and the NO that has stored xCan discharge, and at NO when sulfur poisoning recovers control transformation xDischarge without purification, that is, NO takes place xEscape.NO xThe stored type catalyzer can be stored NO xTemperature comprise from the very wide scope of the low paramount exhaust gas temperature of exhaust gas temperature specifically, the reason that above-mentioned phenomenon takes place estimates it is the NO that is stored when low temperature xRelease.
Work as NO although disclosed among the JP-A-2001-304011 xThe air fuel ratio of setting waste gas when the temperature of stored type catalyzer is not less than predetermined temperature is not still considered the thermal dissociation temperature of catalyzer gradually towards a portly side.
On the other hand, JP-A-2003-120373 has disclosed at NO xWhen raising, the temperature of stored type catalyzer repeatedly adds additive.
Although NO xEven the stored type catalyzer also can be realized storage not being higher than under the reducible temperature, but when to NO xWhen the stored type catalyzer is implemented the temperature of rising catalyzer in the process that sulfur poisoning recovers control, the NO that has stored xCan be before reaching the activation temperature of catalyzer because of thermal dissociation discharges, and at NO when sulfur poisoning recovers control transformation xDischarge without purification, NO promptly takes place xEscape.And, can carry out the temperature that sulfur poisoning recovers if temperature risen to immediately, then catalyzer will excessively heat up and surpass the limiting temperature of catalyzer or catalyst carrier.
Although JP-A-2003-120373 has disclosed at NO xRepeatedly add additive when the temperature of stored type catalyzer raises, but still do not consider the reaction temperature of catalyzer.
Summary of the invention
The purpose of this invention is to provide a kind of off-gas cleaning equipment, this equipment can recover to prevent in the control procedure NO at sulfur poisoning xThe unexpected intensification of stored type catalyzer is to limit the NO owing to thermal dissociation was caused xEscape.
According to a first aspect of the invention, off-gas cleaning equipment comprises: NO xStorage reduction-type catalyzer, but described catalyzer is placed in the exhaust passage of internal-combustion engine of lean combustion described NO xStorage reduction-type catalyzer is stored NO when the air fuel ratio of the waste gas that is flowed into is poor attitude x, and discharge the NO that is stored when being portly in the air fuel ratio of the waste gas that is flowed into xThe air fuel ratio that changes described air fuel ratio changes the unit; The reducing agent feed unit, this unit is added into described NO with reducing agent xIn the storage reduction-type catalyzer; Temperature detecting unit, this unit detects described NO xThe temperature of storage reduction-type catalyzer; Poisoning recovery identifying unit on opportunity, this unit is to carrying out SO xPoison and judge described SO the opportunity of recovering to handle xPoison and recover to handle promptly from described NO xDischarge SO in the storage reduction-type catalyzer xProcessing; And control unit, when recovering identifying unit judgement on opportunity, described poisoning carries out SO xThe opportunity of the recovery control processing of poisoning, described control unit was controlled described reducing agent feed unit with the interpolation reducing agent temporarily, and, be lower than described NO in the temperature that described temperature detecting unit detected xStore the thermal dissociation temperature of reduction-type catalyzer and be higher than and to carry out NO xDuring the temperature of reduction reaction, described control unit is controlled described air fuel ratio and is changed the unit to become described air fuel ratio portly.
According to the present invention, when described poisoning recover opportunity identifying unit judge be used to carry out this processing opportunity temporarily, making from the adding quantity of the reducing agent of described reducing agent feed unit interpolation progressively increases.Therefore the heating rate of catalyzer also will be progressively.And if in the increase process of reducing agent adding quantity, the temperature that is detected by described temperature detecting unit is lower than described NO xThe thermal dissociation temperature of storage reduction-type catalyzer then changes the unit to described air fuel ratio and controls so that air fuel ratio becomes portly.Therefore at NO xStorage reduction-type catalyzer can will be stored in this NO before reaching its thermal dissociation temperature xNO in the storage reduction-type catalyzer xReduction, thus the NO that when reaching the thermal dissociation temperature, is occurred reduced xThe amount of escaping.And, because the heating rate of catalyzer is progressively, so NO xThe excessive rising (excessively heating up) of the temperature of storage reduction-type catalyzer also can be inhibited.
Description of drawings
Fig. 1 is the layout plan that shows the off-gas cleaning equipment of embodiment of the present invention and the motor of this equipment is installed;
Fig. 2 is the Line Chart of the relation of poisoning convalescence, reducing agent delivery volume, catalyst temperature and rich spike action opportunity in the first embodiment of the invention;
Fig. 3 is by the flow chart of the mode of execution of control unit control in the first embodiment of the invention;
Fig. 4 is the Line Chart of the relation of poisoning convalescence, reducing agent delivery volume, catalyst temperature and rich spike action opportunity in the second embodiment of the invention; With
Fig. 5 is by the flow chart of the mode of execution of control unit control in the second embodiment of the invention.
Embodiment
First mode of execution
Fig. 1 has shown the off-gas cleaning equipment of embodiment of the present invention.This off-gas cleaning equipment is applicable to explosive motor (hereinafter referred to as " motor ") 1.Motor 1 is a four cylinder engine, and this engine configurations has critical pieces such as fuel system 2, firing chamber 3, suction system 4, vent systems 5.Fuel system 2 is equipped with supply pump 9, common guide rails 6 and nozzle 7, and these parts are main injection units and play the function that air fuel ratio changes the unit.Supply pump 9 is driven by motor 1, and the fuel of extracting out from unshowned fuel tank is applied high pressure, and passes through motor fuel passage 8 with fuel supply nonexclusive guideway 6.Nonexclusive guideway 6 plays the effect of accumulation of pressure chamber, be used to be contained in the fuel under high pressure of supplying with by supply pump 9 under the predetermined pressure (accumulating the pressure of this fuel under high pressure), and between nozzle 7, distribute described accumulation that the fuel of pressure is arranged, each nozzle 7 configurations like this are made its firing chamber 3 towards each cylinder.
Each nozzle 7 is the solenoid valve of the known type of the o shown in portion is equipped with within it.No matter be in the breathing process or compression process of motor 1, each nozzle 7 all directly provides fuel to corresponding cylinder according to the serviceability of motor 1, and the basic emitted dose that is used to obtain driving force is determined by unshowned chart.
Suction system 4 has formed and has been used for institute's inhaled air provided to each firing chamber 3 passage (air intake passage), and vent systems 5 has then formed and has been used to passage (exhaust passage) that waste gas is discharged from each firing chamber 3.Motor 1 is equipped with the turbosupercharger 10 of known type.Turbosupercharger 10 is equipped with the solid of rotation 12 and 13 that links to each other by axle 11.One of them solid of rotation is the turbine wheel 12 in the waste gas that is exposed in the vent systems 5, and another solid of rotation is to be exposed to the compressor impeller 13 in institute's inhaled air in the suction system 4.Turbosupercharger 10 has layout like this, so that make its exhaust flow (exhaust gas pressure) that can utilize turbine wheel 12 to be received carry out the turbosupercharging of form known, with rotary compressor impeller 13 and increase pressure of inspiration(Pi).At the air-breathing upstream side with respect to compressor impeller 13 pneumatic sensor 28 is installed, flow velocity (air-breathing speed) the relevant detection signal of the air (suction air) of suction system 4 can be exported and be directed into to this pneumatic sensor 28.
The downstream side of turbosupercharger 10 is equipped with interstage cooler 14 in suction system 4, and this interstage cooler 14 can be forced cooling to the institute's inhaled air that heats up by turbosupercharging.The throttle valve 15 that is installed in the more downstream side of interstage cooler 14 is automatically controlled close/open valves, play the effect that air fuel ratio changes the unit, use this throttle valve 15 to regulate opening, and have the function of under predetermined condition, adjusting the delivery rate (flow velocity) that sucks air by the flow path area that changes the suction air with stepless mode.
Be formed with EGR (exhaust gas recirculation) passage 16 in motor 1, this EGR passage 16 can be used as the return flow line of waste gas, along separate routes upstream side (suction system 4) and downstream side (vent systems 5) of firing chamber 3 in parallel.EGR passage 16 has the function of in due course part waste gas being returned suction system 4.The EGR valve 17 of open/cutting out in stepless mode by electric control is installed in EGR passage 16 and the waste gas of (backflow) EGR passage 16 of flowing through is carried out cooled EGR cooler 18, described EGR valve 17 makes and can carry out free adjustment to the flow velocity of the waste gas (EGR gas) of this passage of flowing through, and can play the effect that air fuel ratio changes the unit.
In the exhaust passage 50 in the downstream side of the exhaust flow outgoing direction of turbine wheel 12 reducing agent nozzle 21 is installed, this nozzle is used for waste gas to the exhaust passage 50 of flowing through to be provided and adds fuel as reducing agent; And NO xStorage reduction-type catalyzer (" NO hereinafter referred to as xCatalyzer ") 20, described NO xCatalyzer 20 is contained in the sleeve pipe 27 and to waste gas and purifies.
Reducing agent nozzle 21 adds passage 23 via fuel and links to each other with supply pump 9, and thus, the part of fuel that pumps from fuel tank is supplied to reducing agent nozzle 21.In fuel interpolation passage 23, solenoid valve 24 is installed, is used for flow velocity and the opening and closing fuel of fuel metering and adds passage 23 from supply pump 9 to reducing agent nozzle 21.Controlled by control unit 25 opportunity that solenoid valve 24 open/is closed, and to NO xThe waste gas that the exhaust passage of the upstream side of catalyzer 20 is 50 li provides and adds fuel as reducing agent.
At NO xAir fuel ratio (A/F) sensor 30 is installed in the exhaust passage 50 of the upstream side of catalyzer 20.The testing signal that 30 outputs of air fuel ratio (A/F) sensor constantly change with the oxygen concentration in the waste gas of sleeve pipe 27 upstream sides.At NO xIn the exhaust passage 50 in catalyzer 20 downstream sides exhaust gas temperature sensor 32 and NO are installed xSensor 31, described exhaust gas temperature sensor 32 can be used as and detect NO xThe temperature detecting unit of the temperature of catalyzer 20.NO xSensor 31 outputs are with NO xNO in the waste gas in catalyzer 20 downstream sides xConcentration and the testing signal that constantly changes.Will speed up device position transducer 33 is installed on the unshowned accelerator pedal of motor 1 and the corresponding testing signal of rolling reduction of output and pedal.At every turn when the output shaft (bent axle) of motor 1 when having rotated tilt fixing, crank angle sensor 34 is with regard to output detection signal (pulse).Sensor 30～34 all is electrically connected to the input end of control unit 25.
Control unit 25 is made of the known computer that is equipped with central processing unit (CPU) (CPU), ROM (read-only memory) (ROM), random-access memory (ram), standby RAM and timer conter etc.Control unit 25 is imported the testing signal of various sensors by unshowned outside incoming line, based on these signals, can carry out the control that relates to following operation: the valve on/off operation of nozzle 7, the opening of EGR valve 17 are regulated, the opening of throttle valve 15 is regulated and various other controls relevant with the serviceability of motor 1.
With NO xCatalyzer 20 is packed in the sleeve pipe 27 and is installed on the exhaust passage 50.NO xCatalyzer 20 has the carrier that is cellular structure, carries as NO on the surface of carrier xStorage agent such as potassium (K), sodium (Na), lithium (Li) or caesium alkali metal such as (Cs), such as barium (Ba) or calcium alkaline-earth metal such as (Ca) or such as lanthanum (La) or yttrium rare earth metals such as (Y), and carry as oxidation catalyst (noble metal catalyst) such as platinum precious metals such as (Pt).
NO xStorage agent has storage NO when waste gas is in poor attitude x, and discharge NO when portly when waste gas is in xCharacter.When with NO xBe released into waste gas, and have HC in the waste gas, during CO etc. because noble metal catalyst can promote the oxidation reaction of HC and CO, thereby redox reaction can take place between mentioned component, NO wherein xAs oxidizing component, and HC and CO are as the reduction composition.Thus HC and CO are oxidized to CO 2And H 2O, and with NO xBe reduced to N 2
Owing to storing the NO of preset limit amount XAfterwards, even when waste gas is in poor attitude, NO xStorage agent also can't be stored more NO xSo, the NO that must will store xIn reducing atmosphere, be reduced to N as mentioned above 2Deng and remove.Therefore for this off-gas cleaning equipment, implement so-called rich spike with the time of predetermined period, predetermined length, thereby at NO xThe excessive state of CO is forced to create in the inside of stored type catalyzer 20, that is, reducing atmosphere, thus discharge, reduce and remove the NO that is stored x(NO xPurify), the method for implementing described rich spike is: by being reduced air imbibed quantity by EGR or suction throttling valve, increase the engine spray amount, and fuel sprayed into carry out rich air-fuel ratio operation in the exhaust piping.In fact, above-mentioned predetermined period is that the timer conter by ECU (electric control device) 25 inside carries out regularly, and controls EGR valve 17, throttle valve 15, nozzle 7 and reducing agent nozzle 21 by ECU25.Although what this predetermined period was based on supposition is being stored in NO under normal power operation xNO in the stored type catalyzer 20 xThe time that the amount of reaching capacity spent is set, but should also can estimate by the operating range of for example vehicle in the cycle.That is, rich air-fuel ratio operation (rich spike) can be carried out behind the intended distance that travels.
Based on the serviceability of the determined motor 1 of the testing signal of various sensors, ECU25 carries out fuel injection control by nozzle 7.Here fuel injection control relates to by respective nozzles 7 fuel is sprayed in each firing chamber 3, this control is a series of processing, wherein to setting, and carry out the valve on/off operation of each nozzle 7 based on these setup parameters such as parameters such as fuel injection amount, injection timing, jet modes.In the running of motor 1, ECU25 carries out a series of like this processing in the given time repeatedly.Based on the rolling reduction of accelerator pedal and the rotating speed of motor (can based on the pulse signal of crank angle sensor calculate parameter) and, can determine fuel injection amount and injection timing with reference to predefined unshowned chart.
Setting for fuel injection mode, ECU25 can be by carrying out spraying obtaining the output of motor as the fuel of main injection to each cylinder near compression top dead center, and the fuel before suitable selected opportunity selected cylinder being carried out main injection sprays (hereinafter referred to as " back injection ") as the fuel of secondary injection after spraying (hereinafter referred to as " pilot injection ") and main injection.
Will by after spray into firing chamber 3 fuel reforming be the light HC in the combustion gas and be disposed to vent systems 5.That is, will be added in the vent systems 5 by the back injection, increase the concentration of reduction composition in the waste gas thus as the light HC of reducing agent.The reduction composition that is added to vent systems passes through NO xCatalyzer 20 and NO xThe NO that catalyzer discharged xAnd other oxidizing components that contained in the waste gas react.The reaction heat that produces in this process will make NO xThe bed temperature of catalyzer (temperature) raises.As rich air-fuel ratio operation (rich spike), in each predetermined period, can carry out the back and spray the control that replaces by the emitted dose of 7 pairs of main injections of nozzle.
Based on the serviceability by the determined motor 1 of the testing signal of various sensors, ECU25 can carry out EGR control.EGR control is meant the driving and the operation of the EGR valve 17 that is installed in the EGR passage 16, its objective is the flow velocity of the gas of adjusting the EGR passage 16 of flowing through,, is recycled to the flow velocity of the waste gas of suction system 4 by vent systems 5 that is.
As the open amount (hereinafter referred to as " target valve open amount ") of the EGR valve 17 of target is according to the determining such as serviceability such as load, rotating speeds of motor 1 basically, and can determine with reference to predetermined unshowned chart.In motor 1 operation process, ECU25 upgrades this target valve open amount at interval with each preset time, and continuous drive circuit output instruction signal to EGR valve 17 is so that be complementary the actual valve open amount of EGR valve 17 and the target valve open amount after the renewal.
Similar to the situation that adopts the back to spray, by fuel (reducing agent) directly is added in the vent systems 5 via reducing agent nozzle 21, can increase the concentration and the elevation of NO of reduction composition in the waste gas xThe bed temperature of catalyzer 20.Compare with the fuel that sprays adding by the back, the fuel that adds by reducing agent nozzle 21 is more prone to exist and distribution unevenly in waste gas with big molecular state.And, when carrying out the fuel interpolation, for the degrees of freedom and the degrees of freedom on the opportunity of interpolation of the fuel quantity that can add simultaneously, all greater than the degrees of freedom under the back injection situation by reducing agent nozzle 21.
To recover control to sulfur poisoning below and carry out recapitulative description.All can increase reduction composition in the waste gas because above-mentioned back injection and fuel add control, therefore can will be stored in NO by in predetermined interval, repeating wherein any control xNO in the catalyzer 20 xThe release and the purification of reducing, thus make NO xCatalyzer 20 storage NO xAbility recovered.
When motor 1 continuous running, be accumulated in NO gradually in order to remove xSO in the catalyzer xDeng composition, ECU25 carries out enrichment control (hereinafter referred to as " sulfur poisoning recovers control "), wherein works as NO as shown in Figure 2 xThe temperature of catalyzer 20 is increased to when being not less than target temperature (for example, about 600 ℃), the air fuel ratio before the catalyzer is set at is not more than chemically correct fuel.Recover control by carrying out sulfur poisoning, under high temperature condition, offer NO xA large amount of reduction composition of catalyzer 20 just can be removed the SO that has been stored in the catalyzer xRecover the part of control as sulfur poisoning, ECU25 carries out above-mentioned back injection or waste gas fuel adds control so that with NO xThe temperature of catalyzer 20 is increased to target temperature.In present embodiment, carry out such control (hereinafter referred to as " the reduction composition is supplied with control "), wherein will be stored in NO than discharging and reducing to purify xNO in the catalyzer 20 xThe required fuel more fuel of volume (reduction composition) provides to NO by reducing agent nozzle 21 xThe upstream side of catalyzer 20.
In sulfur poisoning recovers to control, keep NO when removing to set up under the target temperature (600 ℃) as shown in Figure 2 at the necessary sulphur of sulfur poisoning recovery control xDuring the condition of catalyzer 20 temperature, a large amount of reduction compositions can be provided NO to the vent systems xThe upstream side of catalyzer.Yet although under high temperature condition, the branch that is reduced in a large number that offers vent systems shows to remove and is stored in NO xSO in the catalyzer 20 xDeng function, but it also has further elevation of NO xThe characteristic of catalyzer 20 temperature.Thereby under normal operating conditions, when a large amount of reduction compositions being continued to provide NO to the vent systems xDuring the upstream side of catalyzer, NO xCatalyzer 20 is understood NO overheated and that stored xCan be owing to thermal dissociation is emitted.
Therefore ECU25 has poisoning recovery identifying unit on opportunity 42, judge to carry out when poisoning recovery identifying unit on opportunity 42 and recover opportunity of handling temporarily, ECU25 can make the adding quantity of the reducing agent that is added by reducing agent nozzle 21 increase gradually, and, if from the detected temperatures of exhaust gas temperature sensor 32 for being lower than NO xThe predetermined temperature (Fig. 2) of the thermal dissociation temperature of catalyzer 20 is then controlled EGR valve 17, throttle valve 15, nozzle 7 and reducing agent nozzle 21 and is made air fuel ratio become portly rich spike with execution.Promptly, if temperature was lower than the thermal dissociation temperature when predetermined period of rich spike arrived, then carry out rich spike, if being lower than the state of thermal dissociation temperature, the while temperature with respect to the preset time interval, is offset in time, then when temperature is lower than the thermal dissociation temperature, ignores predetermined period and execute rich spike.
The recovery timing identifying unit 42 of poisoning can be judged NO xWhether the sulfur poisoning of catalyzer 20 carries out.In the present embodiment, poison to recover regularly identifying unit 42 by from NO xThe historical record of the testing signal of sensor 31 comes recovery is judged opportunity, and recognizes NO as if it xThe NO of catalyzer 20 xPurification function descends, and then exports the sulphur clear signal, and this signal indication is carried out the opportunity that sulfur poisoning recovers control.
The addition of the reducing agent that is added by reducing agent nozzle 21 is determined and mapping by testing in advance, so that this addition is increased from lighting in time of output sulphur clear signal as shown in Figure 2.
To recover control to the sulfur poisoning of off-gas cleaning equipment with such layout according to flow chart shown in Figure 3 below is described, in step S1, judge whether exporting the sulphur clear signal, if this signal is exported, then enter step S2, control solenoid valve 24 by ECU25, the fuel injection amount (adding quantity) that will be lower than normal amount as the fuel of reducing agent by reducing agent nozzle 21 with setting is added to it in waste gas by spraying.In vent systems 5, as shown in Figure 2, NO xThe temperature of catalyzer 20 raises gradually because of the fuel that is added.ECU25 receives the signal that is sent by temperature transducer 32, and if in step S3, the temperature of detected catalyzer is not less than NO can take place xThe temperature of reduction reaction and be lower than the predetermined temperature temperature of prearranging quatity (the specific heat dissociation temperature low) then enters step S4 and carries out rich spike.
Therefore when from the sulphur clear signal on 42 output expression execution poisoning recovery opportunitys of poisoning recovery identifying unit on opportunity, owing to the ON/OFF of solenoid valve 24 is controlled increasing the adding quantity of the reducing agent that is added by reducing agent nozzle 21 gradually, so the intensification of catalyzer will be progressively.And, in the process that the addition of reducing agent increases, if be to be lower than NO from the detected temperatures of exhaust gas temperature sensor 32 xThe predetermined temperature of catalyzer 20 thermal dissociation temperature then becomes air fuel ratio portlyly, is stored in NO xNO in the catalyzer 20 xJust can be at NO xCatalyzer 20 is reduced before reaching the thermal dissociation temperature.Therefore work as NO xThe NO that the temperature of catalyzer 20 raises because of waste gas and occurs when reaching the thermal dissociation temperature xThe amount of escaping will reduce.And,, therefore can suppress NO because the warming velocity of catalyzer is progressively xThe excessive rising of catalyzer 20 temperature (excessively heating up), thus reduce thermolysis and improve serviceability.
Among Fig. 2, the dotted line that unexpected misfortune replaces show when additive by reducing agent nozzle 21 can make NO xWhen the temperature of catalyzer 20 rises to the amount injection of sulphur removing target temperature immediately, NO xEscape amount and NO xThe intensification situation of catalyzer 20, solid line then show in the present embodiment, when before the additive capacity from reducing agent nozzle 21 increases gradually and reaching the thermal dissociation temperature, carrying out once rich spike, and NO xThe escape amount and the intensification feature of catalyzer.Fig. 2 clearly shows, when carrying out rich spike under the predetermined temperature that is being lower than the thermal dissociation temperature, and NO xThe escape amount significantly reduces.
Second mode of execution
Below, will be described second mode of execution of the present invention.As shown in Figure 4, in this second mode of execution, recover in the control, keep NO when setting up at the sulfur poisoning recovery necessary sulphur removing target temperature of control (600 ℃) at sulfur poisoning xDuring the condition of the temperature of catalyzer 20, a large amount of reduction compositions can be provided NO to the vent systems xThe upstream side of catalyzer.Yet although under high temperature condition, the branch that is reduced in a large number that offers vent systems shows to remove and is stored in NO xSO in the catalyzer 20 xDeng function, but it also has further elevation of NO xThe characteristic of the temperature of catalyzer 20.Therefore when a large amount of reduction compositions being continued to provide NO to the vent systems xDuring the upstream side of catalyzer, NO xThe NO that catalyzer 20 can excessively heat up and be stored xUnderstand owing to thermal dissociation is emitted, and, if but reaching reaction temperature (HC firing temperature) (NO under this temperature xThe usefulness of catalyzer 20 is minimum) before additive HC is added in the waste gas, then unburned HC may be released in the atmosphere or HC can be adsorbed in the catalyzer, thereby and this HC can after catalyst temperature is able to carry out the temperature of catalytic reaction, burning immediately cause excessive intensification.
Therefore ECU25 has poisoning recovery identifying unit on opportunity 42, and when poisoning recovery identifying unit on opportunity 42 is judged when having arrived the opportunity of carry out to recover handling, shown in the symbol A among Fig. 4, finish for the first time by reducing agent nozzle 21 that reducing agent adds (adding for the first time) and can carry out NO so that detected temperatures t0 from exhaust gas temperature sensor 32 is not less than xThe temperature t 2 of the reduction reaction of catalyzer 20 but be lower than thermal dissociation temperature t 4, when surpassing from the detected temperatures t0 of exhaust gas temperature sensor can carry out the temperature t 2 of reduction reaction the time, carrying out rich spike, that air fuel ratio is become is portly, after this richness spike is carried out, shown in symbol B among Fig. 4, control reducing agent nozzle 21 is to carry out the reducing agent interpolation second time (adding for the second time), so that make the detected temperatures t0 from exhaust gas temperature sensor 32 equal NO xThe SO of catalyzer 20 xPoison and recover target temperature t3.In carrying out rich spike, EGR valve 17, throttle valve 15, nozzle 7 and reducing agent nozzle 21 all are controlled.
And, when the detected temperatures t0 from exhaust gas temperature sensor 32 is lower than the firing temperature t1 (described firing temperature t1 is for carrying out the temperature of catalytic reaction) of HC, ECU25 carries out the intensification control of motor 1, so that make the firing temperature t1 that equals HC from the detected temperatures t0 of exhaust gas temperature sensor 32.
Poisoning recovery identifying unit on opportunity 42 is judged NO xWhether the sulfur poisoning of catalyzer 20 carries out.In the present embodiment, poisoning recovery identifying unit on opportunity 42 is by from NO xThe historical record of the testing signal of sensor 31 comes recovery is judged opportunity, and recognizes NO as if it xThe NO of catalyzer 20 xPurification function descends, and then exports the sulphur clear signal, and this signal indication is carried out the opportunity that sulfur poisoning recovers control.
As shown in Figure 4, the addition of the reducing agent that is added by reducing agent nozzle 21 is determined and mapping by testing in advance, so that in the injection of adding for the first time, the temperature of catalyzer is not less than can carry out NO xThe temperature of reduction reaction but be lower than NO xThe thermal dissociation temperature of catalyzer, and make that in the injection of adding for the second time after having carried out rich spike, the amount of additive can make the temperature of catalyzer reach SO xThe target temperature of poisoning and recovering.With the firing temperature t1 of HC, can reduce and send out a temperature t 2 and a SO who answers xThe corresponding information storage of poisoning recovery temperature t3 also is set among the ROM of ECU25.In the present embodiment, but suppose that reaction temperature t1 is 200 ℃, the temperature t 2 that can carry out reduction reaction is 250 ℃, this temperature is higher than the firing temperature t1 of HC and is lower than thermal dissociation temperature t 4, and supposition SO xThe recovery target temperature t3 that poisons is 600 ℃.
For present embodiment, when heating up when control by motor 1, thereby by increasing no-load speed, closing suction throttling valve and wait the burning of controlling motor that exhaust gas temperature is raise.
To recover control to the sulfur poisoning with off-gas cleaning equipment thus arranged according to flow chart shown in Figure 5 below is described.In step S1, whether judgement is higher than the temperature t 1 that can carry out catalytic reaction from the testing signal (catalyst temperature t0) of exhaust gas temperature sensor 32, if catalyst temperature t0 is lower than the temperature t 1 that catalytic reaction can take place, then enters step S2 and carry out engine exhaust intensification control.By this control, when to NO xCatalyzer heats and catalyst temperature t0 is surpassed in the time of can carrying out temperature (HC firing temperature) t1 of catalytic reaction, enters step S3.In step S3, judge whether to export the sulphur clear signal, if this signal of output then enters step S4, control solenoid valve 24 by ECU25, by reducing agent nozzle 21 reducing agent that adds is for the first time sprayed in the waste gas.By this injection, at NO xThe temperature that burning and catalyzer take place in the catalyzer 20 raises, and makes NO xCatalyzer 20 is being lower than in the temperature distribution on the very long exhaust gas flow direction under the temperature of thermal dissociation temperature and is becoming even.
In step S5, judge whether catalyst temperature t0 has been able to carry out the temperature t 2 of reduction reaction, if reached the temperature t 2 that to carry out reduction reaction, then enter step S6, and carry out rich spike by control EGR valve 17, throttle valve 15 and reducing agent nozzle 21, enter step S7 then.When in step S6, carrying out rich spike, be not higher than thermal dissociation temperature t 4 owing to can carry out the temperature t 2 of reduction reaction, therefore at NO xCatalyzer 20 reaches can reduce before the thermal dissociation temperature and is stored in NO xNO in the catalyzer 20 x
In step S7, ECU25 controls solenoid valve 24, so that the reducing agent that adds the second time of spraying by reducing agent nozzle 21 enters in the waste gas in the exhaust passage 50, and in step S8, adds reducing agent and equals SO until catalyst temperature t0 xPoison and recover target temperature t3.By the injection of reducing agent, at NO xFully burning takes place in the catalyzer 20, and because temperature is increased to target temperature t3, therefore can removes and be stored in NO xSO in the catalyzer 20 x
Owing to carrying out from NO xDischarge SO in the catalyzer 20 xSO xPoison when recovering to handle, carry out the reducing agent interpolation first time by reducing agent nozzle 21, so that make the detected temperatures t0 from exhaust gas temperature sensor 32 become the temperature t 2 that can carry out reduction reaction, this temperature is not less than NO xThe temperature t 1 that can carry out catalytic reaction of catalyzer 20 but be lower than thermal dissociation temperature t 4, and when it surpasses can carry out the temperature t 2 of reduction reaction the time, the air fuel ratio furnishing is portly, therefore can reduce effectively and be stored in NO xNO in the catalyzer 20 xAnd can reduce the NO that produces because of thermal dissociation xEscape.And when carry out the reducing agent interpolation second time by reducing agent nozzle 21, so that after the control air fuel ratio, make detected temperatures t0 equal NO from exhaust gas temperature sensor 32 xThe SO of storage reduction-type catalyzer xWhen poison recovering target temperature t3, by the temperature distribution of catalyzer stable status the temperature of catalyzer is increased to SO xPoison and recover target temperature t3, therefore can carry out SO xPoison and recover to handle and suppress simultaneously NO xThe excessive intensification of catalyzer 20.
In addition for present embodiment, since when the temperature t 0 of catalyzer less than can carry out the temperature t 1 of catalytic reaction the time, carry out the intensification of generation by the burning control of motor 1, therefore, compare with the situation that reducing agent directly is added to exhaust passage 50, the amount that is adsorbed on the HC on the catalyzer can be reduced, and the escape amount of unburned HC can be reduced.
In Fig. 4, the dotted line that unexpected misfortune replaces is represented to reach certain amount so that NO by the additive that reducing agent nozzle 21 sprays xWhen the temperature of catalyzer 20 rises to sulphur removing target temperature immediately, NO xEscape amount and NO xThe intensification situation of catalyzer, solid line are then represented in the present embodiment when dividing two stages to carry out rich spike operation by reducing agent nozzle 21 additive spray and between adding for the first time and adding for the second time, NO xThe intensification feature of escape amount and catalyzer.Fig. 4 clearly shows, when the rich spike of execution under the state that rises to the temperature t 2 (this temperature is lower than the thermal dissociation temperature) that reduction reaction can take place at catalyst temperature is operated, by adding NO for the first time xThe escape amount sharply reduce.

Claims (5)

1. off-gas cleaning equipment, this off-gas cleaning equipment comprises:
NO xStorage reduction-type catalyzer, but this catalyzer be placed in the exhaust passage of internal-combustion engine of lean combustion, when the air fuel ratio of the waste gas that is flowed into is poor attitude, described NO xStorage reduction-type catalyst stores NO x, and the air fuel ratio of working as the waste gas that is flowed into is when being portly, described NO xStorage reduction-type catalyzer discharges the NO that has stored x
The air fuel ratio that changes described air fuel ratio changes the unit;
The reducing agent feed unit, this unit is added to described NO with reducing agent xIn the storage reduction-type catalyzer;
Temperature detecting unit, this unit detects described NO xThe temperature of storage reduction-type catalyzer;
Poisoning recovery identifying unit on opportunity, this unit is to carrying out SO xPoison and judge described SO the opportunity of recovering to handle xPoison to recover handle promptly by described NO xStorage reduction-type catalyzer discharges SO xProcessing; With
Control unit is carried out SO when described poisoning recovers identifying unit judgement on opportunity xThe opportunity of the recovery control processing of poisoning, described control unit was controlled described reducing agent feed unit to add reducing agent when having arrived; And, be lower than described NO in the temperature that described temperature detecting unit detected xStore the thermal dissociation temperature of reduction-type catalyzer and be higher than and to carry out NO xDuring the temperature of reduction reaction, described control unit changes the unit to described air fuel ratio to be controlled, thereby becomes described air fuel ratio portly.
2. off-gas cleaning equipment as claimed in claim 1 wherein, is carried out described SO when described poisoning recovers identifying unit judgement on opportunity xThe opportunity that the recovery of poisoning is handled, described control unit increased the adding quantity of the reducing agent that is added by described reducing agent feed unit gradually when having arrived, and,
If the temperature that described temperature detecting unit detected is lower than described NO xStore the thermal dissociation temperature of reduction-type catalyzer and be higher than and to carry out NO xThe temperature of reduction reaction, then described control unit change the unit to described air fuel ratio to be controlled, thereby it is portly that described air fuel ratio is become.
3. off-gas cleaning equipment as claimed in claim 1, described off-gas cleaning equipment also comprises following control unit: by described NO xStorage reduction-type catalyzer discharges SO xSO xPoison and recover in the processing, described air fuel ratio is changed the unit to this control unit and the reducing agent feed unit is controlled, reducing agent adds to carry out for the first time by described reducing agent feed unit, thereby the temperature that described temperature detecting unit is detected fades in the following temperature range: be higher than and can make described NO xStorage reduction-type catalyzer carries out the temperature of reduction reaction and is lower than described NO xThe thermal dissociation temperature of storage reduction-type catalyzer, and when temperature that described temperature detecting unit detected is the temperature that is in this scope, changing the unit by described air fuel ratio is made as described air fuel ratio portly, and by described reducing agent feed unit execution reducing agent interpolation for the second time, thereby the temperature that described temperature detecting unit is detected equals described NO xThe SO of storage reduction-type catalyzer xPoison and recover target temperature.
4. off-gas cleaning equipment as claimed in claim 3, wherein, when but temperature that described temperature detecting unit detected is lower than the reaction temperature of this catalyzer, but described control unit is carried out the intensification control of this internal-combustion engine so that the temperature that described temperature detecting unit is detected equals described reaction temperature.
5. off-gas cleaning equipment as claimed in claim 3, wherein, the reducing agent adding quantity in the described reducing agent interpolation second time is higher than the reducing agent adding quantity in the described reducing agent interpolation first time.
CNA200510059868XA 2004-03-31 2005-03-31 Exhaust gas cleaning device Pending CN1676893A (en)

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CN104405486A (en) * 2013-06-28 2015-03-11 康明斯有限公司 Simulation fuel sulfur sensor for improving high sulfur resistance of SCR system
CN104405485A (en) * 2013-06-28 2015-03-11 康明斯有限公司 Simulation fuel sulfur sensor for improving high sulfur resistance of SCR system
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