CN107614842A - Emission-control equipment - Google Patents
Emission-control equipment Download PDFInfo
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- CN107614842A CN107614842A CN201680030092.5A CN201680030092A CN107614842A CN 107614842 A CN107614842 A CN 107614842A CN 201680030092 A CN201680030092 A CN 201680030092A CN 107614842 A CN107614842 A CN 107614842A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/02—Heat treatment
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- 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
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Biomedical Technology (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Including：SOx discharging amounts calculating section (69),, based on the value after the SOx uptakes for being absorbed reduction catalyst absorption by NOx are multiplied with the desulfurization degree of the absorbed SOx of the expression ratios being desulfurized in time per unit, NOx when performing catalyst regeneration process to calculate successively absorbs the desulfurization amount of the time per unit in reduction catalyst for it；SOx uptakes operational part (67), it is using the desulfurization amount calculated successively by SOx discharging amounts calculating section (69), to estimate the newest SOx uptakes that NOx absorbs reduction catalyst；And SOx purifications perform control unit (68), it controls the execution of catalyst regeneration process based on the SOx uptakes being deduced.
Description
Technical field
The present invention relates to the row that the catalyst regeneration process for removing the SOx disengagings absorbed is performed for NOx catalyst
Air purifying apparatus.
Background technology
In the past, the NOx catalyst of reduction purification is carried out as the nitride (NOx) in the exhaust to being discharged from internal combustion engine,
Such as known NOx absorbs reduction catalyst.NOx absorbs reduction catalyst and absorbed when exhaust is lean-burn environment to be contained in exhaust
Some NOx, also, exhaust be it is dense combustion environment when with the hydrocarbon contained in exhaust by reduction purification by the NOx absorbed without
Evilization is simultaneously discharged.Therefore, in the case where the NOx uptakes of catalyst have reached scheduled volume, in order that NOx absorbabilities are extensive
It is multiple to be purified, it is necessary to regularly enter to exercise exhaust as the so-called NOx of dense combustion state (for example, referring to patent document 1).
In addition, the oxysulfide (hereinafter referred to as SOx) contained in exhaust is also absorbed in NOx absorbs reduction catalyst.
If SOx uptakes increase, the problem of NOx detergent powers for making NOx absorb reduction catalyst reduce be present.Therefore, in SOx
In the case that uptake has reached scheduled volume, depart from order that SOx absorbs reduction catalyst from NOx with from sulfur poisoning (in S
Poison) recover to depart from the so-called SOx purifications of temperature (for example, referring to patent, it is necessary to regularly enter to exercise delivery temperature and rise to SOx
Document 2).
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2008-202425 publications
Patent document 2：Japanese Unexamined Patent Publication 2009-47086 publications
The content of the invention
The invention problem to be solved
For example, the SOx uptakes adsorbed for being absorbed the absorbing material of reduction catalyst by NOx, by by source
The result that SOx amounts in fuel and the SOx amount phase adductions from machine oil subtract after being released to outside SOx amounts is accumulated
Point, so as to estimate.
In the execution of SOx purifications, such as the SOx amounts time per unit for thinking to be released to outside is constant basis.
SOx uptakes are for example used to judge the beginning of SOx purifications (catalyst regeneration process) or end.Cause
This, if SOx uptakes can not be estimated accurately, it is likely that SOx purifications can be performed all for naught, cause fuel economy
Deterioration.Thus, it is desirable to accurately estimate the SOx uptakes adsorbed by NOx catalyst.
The purpose of the emission-control equipment of the disclosure is that the precision of the presumption for the SOx uptakes for making NOx catalyst improves,
And suitably control the execution of catalyst regeneration process.
Means for solving the problems
The emission-control equipment of the disclosure makes for the NOx catalyst that is arranged in the exhaust passage of internal combustion engine, execution
Delivery temperature rises to desulfurization temperature so that the SOx absorbed by NOx catalyst departs from the catalyst regeneration process removed, bag
Include：Desulfurization amount calculates part, and it based on by SOx uptakes that NOx catalyst absorbs and representing that absorbed SOx exists
The desulfurization degree of the ratio that the often predetermined time is desulfurized be multiplied after value, during calculating the execution of catalyst regeneration process successively
Desulfurization amount in NOx catalyst；Uptake estimates part, and it by desulfurization amount using calculating desulfurization amount that part calculates successively to push away
Determine the newest SOx uptakes of NOx catalyst；And control unit is performed, it is controlled based on the SOx uptakes being deduced
Catalyst regeneration process.
Invention effect
According to the emission-control equipment of the disclosure, it is possible to increase the precision of the presumption of the SOx uptakes of NOx catalyst, energy
Enough it is appropriately performed catalyst regeneration process.
Brief description of the drawings
Fig. 1 is the monolithically fabricated figure for the emission control system for representing present embodiment.
Fig. 2 is the timing diagram for the SOx purification controls for illustrating present embodiment.
The block diagram of the setting processing of MAF desired values when Fig. 3 is the SOx purification lean-burn controls for representing present embodiment.
Fig. 4 is the block diagram for the dense setting processing for firing target injection amount when controlling of SOx purifications for representing present embodiment.
Fig. 5 is the timing diagram of the catalyst temperature adjustment control for the SOx purification controls for illustrating present embodiment.
Fig. 6 is the block diagram of the end processing for the SOx purification controls for representing present embodiment.
Fig. 7 is that the SOx for illustrating present embodiment purifies the figure of the SOx uptakes under control.
Fig. 8 is the block diagram of the processing of the emitted dose learning correction for the In-cylinder injector for representing present embodiment.
Fig. 9 is the flow chart of the calculation process of the learning correction coefficient for the In-cylinder injector for illustrating present embodiment.
Figure 10 is the block diagram of the setting processing for the MAF correction coefficient for representing present embodiment.
Embodiment
Hereinafter, based on brief description of the drawings one embodiment of the present invention uptake estimating device and apply the uptake
The emission control system of estimating device.
As shown in figure 1, in each cylinder of diesel motor (hreinafter referred to as engine) 10, being respectively arranged with not to be schemed
In-cylinder injector 11 of the fuel under high pressure of the common rail pressure accumulation shown to each cylinder inner direct.The combustion of these each In-cylinder injectors 11
Material emitted dose or fuel injection timing are controlled according to the indication signal inputted from electronic control unit (hereinafter referred to as ECU) 50
System.
The inlet channel 12 for importing new gas is connected with the inlet manifold 10A of engine 10, is connected on exhaust manifold 10B
Having to be vented to exhaust passage 13 derived from outside.In inlet channel 12, air mistake is disposed with from air inlet upstream side
Filter 14, inhaled air volume sensor (hereinafter referred to as MAF (Mass Air Flow) sensor) 40, variable capacity type booster
20 compressor 20A, charge air cooler 15, air inlet shutter 16 etc..In exhaust passage 13, it is disposed with from exhaust-gas upstream side
The turbine 20B of variable capacity type booster 20, exhaust gas post-treatment device 30 etc..In addition, in Fig. 1, reference 41 represents to draw
Speed probe is held up, reference 42 represents accelerator open degree sensor, and reference 46 represents boost-pressure sensor.
EGR(Exhaust Gas Recirculation：Exhaust gas recirculatioon) device 21 includes：EGR channel 22, it is connected
Exhaust manifold 10B and inlet manifold 10A；Cooler for recycled exhaust gas 23, it cools down EGR gases；And EGR valve 24, it adjusts EGR amount.
Exhaust gas post-treatment device 30 be by shell 30A from exhaust-gas upstream side successively configure oxidation catalyst 31,
NOx absorb reduction catalyst (example of NOx catalyst) 32, particulate filter (hreinafter referred to as filter) 33 and
Form.In addition, in than exhaust passage 13 of the oxidation catalyst 31 by upstream side, exhaust steam injector 34 is provided with, the exhaust
Injector 34 sprays unburned fuel (mainly HC) into exhaust passage 13 according to the indication signal inputted from ECU50.
Oxidation catalyst 31 be, for example, by the ceramics supporting body such as honeycomb structured body surface carry oxidation catalyst into
Divide and formed.If by exhaust steam injector 34 or In-cylinder injector 11 it is remote after spray to oxidation catalyst 31 and supply unburned combustion
Material, then oxidation catalyst 31 is oxidized and delivery temperature is increased.
It is, for example, by carrying alkali gold on the ceramics supporting body such as honeycomb structured body surface that NOx, which absorbs reduction catalyst 32,
Category etc. and formed.NOx absorption reduction catalysts 32 absorb the NOx in exhaust when exhaust air-fuel ratio is lean burn,
Also, the NOx absorbed is gone back with the reducing agent (HC etc.) contained in exhaust when exhaust air-fuel ratio is dense combustion state
Original purification.
Filter 33 is, for example, by flowing side of the multiple units that will be divided by the partition wall of Porous along exhaust
To configuration and by the upstream side of these units and downstream alternately hole close and formed.Pore of the filter 33 in partition wall
Or the PM (particulate material) in the trapping exhaust of surface, if also, PM accumulations estimated amount reach scheduled volume, execution is burnt
The so-called filter forced regeneration removed.By using the oxidation catalyst 31 of exhaust pipe inspection or remote rear injection to the upstream side
Unburned fuel is supplied, the delivery temperature flowed into filter 33 is warming up to PM ignition temperatures, so as to carry out filter pressure
Regeneration.
1st exhaust gas temperature sensor 43 is arranged on the position that upstream side is leaned on than oxidation catalyst 31, to being flowed into oxidation
Delivery temperature in catalyst 31 is detected.2nd exhaust gas temperature sensor 44 is configured in NOx and absorbs reduction catalyst 32
Between filter 33, the delivery temperature flowed into filter 33 is detected.NOx/ exhaust gas oxygensensors 45 are the exhaust actual measurement portions of the present invention
One example of part, is arranged on the position than the downstream of filter 33, and detection has passed through NOx and absorbed reduction catalyst 32
Exhaust NOx value and λ value (hereinafter also referred to as excess air ratio).
ECU50 carries out the various controls of the grade of engine 10, be configured to include known to CPU, ROM, RAM, input interface, defeated
Outgoing interface etc..In order to carry out these various controls, the sensor values of sensor class 40~46 is input into ECU50.In addition,
There is filter regeneration control unit 51, SOx purifications control unit 60, NOx purifications in ECU50 as part thereof of functional imperative
Control unit 70, MAF follow control unit 80, In-cylinder injector learning correction portion 90 and MAF correction coefficient operational part 98.These
Each functional imperative illustrates as the key element being comprised in the ECU50 as integral hardware, still, additionally it is possible among these
Any part be arranged to single hardware.
[control of filter forced regeneration]
What filter regeneration control unit 51 detected according to the operating range of vehicle or by pressure difference transducer (not shown)
Pressure differential estimates the PM accumulating amounts of filter 33 before and after filter, if also, PM accumulations estimated amount exceed the predetermined upper limit
Threshold value, then activate forced regeneration mark FDPF(t at the time of reference picture 21).If forced regeneration mark FDPFIt is activated, then to exhaust
Injector 34 is sent after it is performed the indication signal of exhaust pipe inspection or making its execution remote the transmission of each In-cylinder injector 11
The indication signal of injection, delivery temperature is set to be warming up to PM ignition temperatures (for example, about 550 DEG C).If PM accumulations estimated amount is reduced to
The predetermined lower threshold (decision threshold) being flared off is represented, then closes forced regeneration mark FDPF(at the time of reference picture 2
t2).In addition, close forced regeneration mark FDPFDecision threshold for example filter forced regeneration can also be started (FDPF=1)
The upper limit elapsed time or the upper limit afterwards adds up emitted dose as benchmark.
[SOx purifications control]
SOx purification control units 60 perform following control：Exhaust is set to turn into dense combustion state so that delivery temperature rises to desulfurization
Temperature (for example, about 600 DEG C), NOx is absorbed reduction catalyst 32 and recover (control below, to be referred to as into SOx from SOx poisonings
Purify (catalyst regeneration process) control).
Fig. 2 represents the timing diagram of the SOx purification controls of present embodiment.As shown in Fig. 2 in forced regeneration mark FDPFQuilt
While closing, start the SOx purification marks F of SOx purification controlsSPBe activated (t at the time of reference picture 22).Thereby, it is possible to height
Effect ground makes the state that delivery temperature rises be transferred to SOx purification controls, Neng Gouyou from the forced regeneration by filter 33
Reduce Fuel Consumption in effect ground.
In the present embodiment, the lower dense burning of SOx purifications control be by and with SOx purification lean-burn controls and SOx it is net
Change it is dense combustion control and realize, wherein, the SOx purification lean-burn control in, using air system control make excess air ratio from
(e.g., from about 1.5) it is superfluous by the 1st target gas of lean-burn side to be reduced to value (about 1.0) more suitable than chemically correct fuel during normal operation
Rate (e.g., from about 1.3), in the dense combustion control of SOx purifications, make excess air ratio from the 1st target gas using spraying system control
Excess rate is reduced to the 2nd target gas excess rate (e.g., from about 0.9) of dense combustion side.Hereinafter, illustrate SOx purification lean-burn control and
The details of the dense combustion control of SOx purifications.
[the air system control of SOx purification lean-burn controls]
Fig. 3 is MAF desired values MAF when representing SOx purification lean-burn controlsSPL_TrgtSetting processing block diagram.1st mesh
Mark excess air ratio setting chart 61 is referenced based on engine speed Ne and accelerator open degree Q (fuel injection amount of engine 10)
Chart, be in advance based on experiment etc. and be set with SOx corresponding with these engine speeds Ne and accelerator open degree Q purification lean-burn control
When excess air ratio desired value λSPL_Trgt(the 1st target gas excess rate).
First, using engine speed Ne and accelerator open degree Q as input signal, chart is set from the 1st target gas excess rate
61 read excess air ratio desired value λ during SOx purification lean-burn controlsSPL_Trgt, and it is input to MAF desired values operational part 62.Enter
One step, in MAF desired values operational part 62, MAF desired values when being controlled based on following formula (1) computing SOx purification lean-burns
MAFSPL_Trgt。
[numerical expression 1]
In numerical expression (1), QFnl_CorrdRepresent the fuel injection amount described later by after learning correction (except spraying it after remote
Outside), RoFuelRepresent fuel proportion, AFRstoRepresentation theory air-fuel ratio, Maf_ CorrRepresent MAF correction coefficient described later.
If SOx purification marks FSPBecome activation (t at the time of reference picture 22), then will be by the computing of MAF desired values operational part 62
MAF desired values MAFSPL_TrgtIt is input to gradient (ramp) processing unit 63.Gradient processing unit 63 opens engine speed Ne and throttle
Spend Q and read gradient coefficient from each gradient coefficient chart 63A, 63B as input signal, also, the gradient coefficient will be addition of
MAF target amount of tapers MAFSPL_Trgt_RampIt is input to valve control unit 64.
Valve control unit 64 is in order that obtain the actual MAF values MAF inputted from maf sensor 40ActReach MAF target amount of tapers
MAFSPL_Trgt_Ramp, and perform by air inlet shutter 16 to close side throttling and by EGR valve 24 to open side opening feedback control
System.
So, in the present embodiment, based on the excess air ratio read from the 1st target gas excess rate setting chart 61
Desired value λSPL_TrgtAnd the fuel injection amount of each In-cylinder injector 11 sets MAF desired values MAFSPL_Trgt, based on the MAF mesh
Scale value MAFSPL_TrgtAir system is acted and carries out feedback control.Thus, it is not necessary to absorb the upper of reduction catalyst 32 in NOx
Swim side and exhaust gas oxygensensor is set, or, the upstream side of NOx absorption reduction catalysts 32 is provided with the situation of exhaust gas oxygensensor
Under, it need not also use the sensor values of the exhaust gas oxygensensor, it becomes possible to exhaust is reduced to needed for SOx purification lean-burn controls
Desired excess air ratio.
In addition, by by the fuel injection amount Q after learning correctionFnl_CorrdFuel injection as each In-cylinder injector 11
Amount, so as to set MAF desired values MAF with feedforward controlSPL_Trgt, can effectively exclude each In-cylinder injector 11
Deterioration year in year out or the influence of characteristic variations, individual difference etc..
In addition, by MAF desired values MAFSPL_TrgtThe additional gradient coefficient set according to the operating condition of engine 10,
So as to effectively prevent because inhaled air volume drastically change caused by engine 10 misfire or because torque change and
Deterioration of caused driving etc..
[the fuel injection amount setting of the dense combustion control of SOx purifications]
Fig. 4 is to represent that SOx purifies the exhaust pipe inspection in dense combustion control or the target injection amount Q of remote rear injectionSPR_Trgt
The block diagram of the setting processing of (emitted dose of time per unit).2nd target gas excess rate setting chart 65 is turned based on engine
Fast Ne and accelerator open degree Q and referenced chart, it is in advance based on experiment etc. and is set with and these engine speeds Ne and accelerator open degree Q
Excess air ratio desired value λ when the corresponding dense combustion of SOx purifications controlsSPR_Trgt(the 2nd target gas excess rate).
First, using engine speed Ne and accelerator open degree Q as input signal, chart is set from the 2nd target gas excess rate
65 read excess air ratio desired value λ when the dense combustion of SOx purifications controlsSPR_Trgt, and it is input to emitted dose desired value operational part
66.Further, in emitted dose desired value operational part 66, mesh when being controlled based on the following dense combustion of formula (2) computing SOx purifications
Mark emitted dose QSPR_Trgt。
[numerical expression 2]
In numerical expression (2), MAFSPL_TrgtMAF desired values when being SOx purification lean-burns, are transported from above-mentioned MAF desired values
Calculation portion 62 inputs.In addition, QFnl_CorrdRepresent that the MAF described later by after learning correction follows the fuel injection amount before control application
(in addition to being sprayed after remote), RoFuelRepresent fuel proportion, AFRstoRepresentation theory air-fuel ratio, Maf_ CorrRepresent MAF described later
Correction coefficient.
If the dense combustion mark F of SOx purifications described laterSPRBecome to activate, then by by the mesh of the computing of emitted dose desired value operational part 66
Mark emitted dose QSPR_TrgtExhaust steam injector 34 or each In-cylinder injector 11 are sent to as injection indication signal.
So, in the present embodiment, based on the excess air ratio read from the 2nd target gas excess rate setting chart 65
Desired value λSPR_TrgtAnd the fuel injection amount of each In-cylinder injector 11 carrys out sets target emitted dose QSPR_Trgt.Thus, it is not necessary to
The upstream side that NOx absorbs reduction catalyst 32 sets exhaust gas oxygensensor, or, absorb the upper of reduction catalyst 32 even in NOx
In the case that trip side is provided with exhaust gas oxygensensor, the sensor values of the exhaust gas oxygensensor need not be also used, it becomes possible to effectively drop exhaust
The low desired excess air ratio to needed for the dense combustion control of SOx purifications.
In addition, by by the fuel injection amount Q after learning correctionFnl_CorrdFuel injection as each In-cylinder injector 11
Amount, so as to feedforward control come sets target emitted dose QSPR_Trgt, can effectively exclude the warp of each In-cylinder injector 11
Year deterioration or the influence of characteristic variations etc..
[the catalyst temperature adjustment control of SOx purification controls]
T at the time of such as Fig. 22~t4Shown, the SOx that exhaust pipe inspection or remote rear injection are performed by alternately switching is purified
Dense combustion mark FSPRActivation/closing (dense combustion/lean-burn), so as to control SOx purification control in be flowed into NOx absorb reduced form
Delivery temperature in catalyst 32 (hereinafter also referred to as catalyst temperature).If the dense combustion mark F of SOx purificationsSPRBe activated (FSPR=
1), then catalyst temperature rises due to exhaust pipe inspection or remote rear injection and (below, is referred to as into injection period this period
TF_INJ).On the other hand, if the dense combustion mark F of SOx purificationsSPRIt is closed, then catalyst temperature is due to exhaust pipe inspection or remote rear spray
The stopping penetrated and reduce (it is following, interval T will be referred to as during this periodF_INT)。
In the present embodiment, by being set from the injection period beforehand through making such as experiments, chart is (not shown) to be read
Value corresponding with engine speed Ne and accelerator open degree Q, so as to set injection period TF_INJ.In the injecting time sets chart,
With the operating condition of engine 10 be correspondingly set with beforehand through experiment etc. obtain in order that the excess air ratio of exhaust is reliable
The injection period that ground is reduced to the 2nd target gas excess rate and needed.
In the dense combustion mark F of catalyst temperature highest SOx purificationsSPRWhen being switched to closing from activation, pass through feedback control
Setting interval TF_INT.Specifically, handled by PID control, the PID control includes：With the dense combustion mark F of SOx purificationsSPRQuilt
The deviation delta T of final catalyst temperatures and presumption catalyst temperature during closing proportionally makes the ratio control that input signal changes
System and deviation delta T time integral value proportionally make the integration control of input signal change and the time with deviation delta T
Differential value proportionally makes the differential control that input signal changes.The temperature for departing from SOx with reduction catalyst 32 can be absorbed from NOx
Degree comes sets target catalyst temperature, such as the entrance based on the oxidation catalyst 31 detected by the 1st exhaust gas temperature sensor 43
Temperature and exothermic reaction of inside of reduction catalyst 32 etc. is absorbed in oxidation catalyst 31 and NOx to estimate presumption catalysis
Agent temperature.
T at the time of such as Fig. 51It is shown, if SOx purification marks FSPDue to the end (F of filter forced regenerationDPF=0) and by
Activation, the then dense combustion of SOx purifications indicate FSPRAlso it is activated, also, between being fed back when previous SOx purifies control and calculating
Every TF_INTAlso temporarily reset.I.e., after the firm preparation, regeneration of filter first, set according to injection period setting chart
Fixed injection period TF_INJ_1Come perform exhaust pipe inspection or it is remote after injection (t at the time of reference picture 51~t2).So, due to not
Progress SOx purification lean-burns control and purify SOx purifications dense combustion controls since SOx and control, so, it will not make in filter pressure
The delivery temperature risen in regeneration reduces, and can promptly be transferred to SOx purification controls, can reduce Fuel Consumption.
If the next, dense combustion mark F of SOx purificationsSPRDue to passing through injection period TF_INJ_1And become to close, then SOx is purified
Dense combustion mark FSPRIt is closed, until the interval T by being set by PID controlF_INT_1Untill (t at the time of reference picture 52~
t3).Further, if the dense combustion mark F of SOx purificationsSPRDue to through super-interval TF_INT_1And be activated, then again perform and injection period
Between TF_INJ_2Corresponding exhaust pipe inspection or it is remote after injection (t at the time of reference picture 53~t4).Then, these SOx are repeated
Purify dense combustion mark FSPRActivation/closing switching, until due to SOx described later purification control end judge and SOx purify
Indicate FSPIt is closed (t at the time of reference picture 5n) untill.
So, in the present embodiment, according to the operating condition based on engine 10 and the chart of reference makes catalysis to set
The injection period T that agent temperature rises and makes excess air ratio be reduced to the 2nd target gas excess rateF_INJ, also, utilize PID
Control to handle the interval T for declining catalyst temperatureF_INT.Catalyst temperature during SOx purifications are controlled thereby, it is possible to one side
Degree effectively maintains the desired temperature range needed for purification, while making excess air ratio reliably be reduced to target excess
Rate.
[end of SOx purification controls judges]
Fig. 6 is the block diagram for the end processing for representing SOx purification controls.SOx uptakes operational part 67 is based on following numerical expression
(3) situation that, computing is assumed to occur in exhaust and its full dose is absorbed by the absorbing material of NOx absorption reduction catalysts 32
Under SOx uptakes SOx_ STR(g).In the present embodiment, SOx uptakes operational part 67 is based on number in the startup of engine 10
Formula (3) carrys out computing SOx uptakes SOx successively_ STR(g).SOx uptakes operational part 67 is that uptake presumption part and additional quantity are calculated
Go out an example of part.
[numerical expression 3]
SOx_STR=∫ (SOx_Fuel+SOx_oil-SOx_out)
As shown in numerical expression (3), SOx uptakes SOx_ STRIt is to by from the SOx amounts SOx of fuel_ Fuel(g/s) and come
Come from the SOx amounts SOx of machine oil_ oil(g/s) phase adduction subtracts SOx discharging amounts SOx_ out(g/s) result after is integrated and obtained
Arrive.Herein, from the SOx amounts SOx of fuel_ FuelWith the SOx amounts SOx from machine oil_ oilIt is the operating based on internal combustion engine
State and by computing.
SOx discharging amounts SOx_ outIt is the desulfurization amount of time per unit.In SOx purifications, SOx discharging amounts calculating section 69 uses
Following numerical expression (4) carries out computing, so as to calculate SOx discharging amounts SOx_ out.In addition, beyond in SOx purifications, put using SOx
Output calculating section 69, catalyst temperature of reduction catalyst 32 etc. is absorbed based on NOx and calculates SOx discharging amounts SOx_ out.In addition,
Beyond in SOx purifications, by from the SOx amounts SOx of fuel_ FuelWith the SOx amounts SOx from machine oil_ oilSubtracted after addition
SOx discharging amounts SOx_ out(g/s) result is equivalent to by SOx uptakes SOx_ STRThe addition uptake (g/s) newly absorbed.
SOx discharging amounts SOx_ out=(SOx uptakes SOx_ STR* the desulfurization degree of time per unit) * desulfurization degrees correction system
Number ... (4)
Herein, the numerical expression (4) newly obtained based on inventor below opinion, i.e.,：Time per unit in SOx purifications
SOx discharging amounts SOx_ outAccording to SOx uptakes SOx_ STRAnd change, SOx uptakes SOx_ STRIt is more, SOx discharging amounts SOx_ out
More become more；And represent the amount for being desulfurized (releasing) of often predetermined time (unit interval) relative to SOx uptakes SOx_ STR
The desulfurization degree of ratio be not dependent on SOx uptakes SOx_ STRAmount but it is equal.
The desulfurization degree of time per unit in the numerical expression (4) is according to the time from being carved at the beginning of SOx purifications (when passing through
Between) and change.In the present embodiment, the desulfurization degree chart 691 for the corresponding relation for representing elapsed time and desulfurization degree is stored
In ECU60, SOx discharging amounts calculating section 69 obtains the warp from being carved at the beginning of SOx is purified from SOx purification execution control units 68
The time is spent, and desulfurization degree corresponding with the elapsed time is obtained from desulfurization degree chart 691, is calculated using acquired desulfurization degree
SOx discharging amounts SOx_ out。
In addition, desulfurization degree correction coefficient is for the temperature (catalyst temperature) to absorbing reduction catalyst 32 by NOx
With the λ (excess air ratio) in exhaust caused by desulfurization degree the correction coefficient that is corrected of change.Desulfurization degree correction coefficient energy
It is enough beforehand through making catalyst temperature and λ changes and determines SOx discharging amounts and obtain.SOx discharging amounts calculating section 69 is based on catalysis
Agent temperature and λ are released come desulfurization degree correction coefficient corresponding to determining using identified desulfurization degree correction coefficient to calculate SOx
Measure SOx_ out.For catalyst temperature, the entrance temperature based on the oxidation catalyst 31 detected by the 1st exhaust gas temperature sensor 43
Degree and HC/CO caloric values, the heat dissipation capacity to outside in oxidation catalyst 31 and the inside of NOx absorption reduction catalysts 32
Etc. estimating.
If (1) purify mark F from SOxSPThe emitted dose of accumulative exhaust pipe inspection or remote rear injection and the accumulative spray are activated
Elapsed time of timing reaches the amount of penetrating has reached the situation of predetermined upper limit threshold amount, (2) since the SOx purification controls
The NOx that the situation of predetermined upper limit threshold time, (3) are calculated by SOx uptakes operational part 67 absorbs reduction catalyst 32
SOx uptakes SOx_ STRIt is reduced among the situation that expression SOx removes successful predetermined threshold value (termination condition threshold value)
Any one condition set up, then SOx purification perform control unit 68 close SOx purification mark FSPAnd SOx purifications are made to terminate (reference
T at the time of Fig. 24, Fig. 5 at the time of tn)。
In the present embodiment, as noted previously, as having used the numerical expression for meeting the opinion that inventor newly obtains, so energy
Enough SOx discharging amounts SOx for accurately estimating the time per unit in SOx purifications_ out.Make therefore, it is possible to accurately estimate
With SOx discharging amounts SOx_ outObtained from SOx uptakes SOx_ STR.Thus, by using SOx uptakes SOx_ STR, so as to
Enough execution (being to terminate in the present embodiment) for suitably controlling SOx purifications.
In addition, in the present embodiment, by setting accumulative emitted dose and process in purifying the termination condition controlled in SOx
The upper limit of time, in the case of not being in progress due to delivery temperature reduction etc. in SOx purifications, it can effectively prevent fuel
Consumption becomes superfluous.
Next, the SOx uptakes SOx that explanation is estimated by present embodiment_ STR。
Fig. 7 is that the SOx for illustrating present embodiment purifies the figure of the SOx uptakes under control.
For example, in the case where the SOx discharging amounts for being assumed to release when SOx is purified and performed are time per unit constant basis
Example (comparative example) in, estimate SOx as shown in phantom in fig. 7 and purify executory SOx uptakes.Herein, SOx discharging amounts are
The such opinion for assuming newly to obtain with inventor of time per unit constant basis misfits.Therefore, it can be said that the SOx deduced
Uptake is significantly different from the state of reality.In the comparative example, it is than moment T1 that SOx uptakes, which reach termination condition threshold value,
At the time of rearward.Although this SOx uptake for representing actual reaches termination condition threshold value, still perform in a long time
SOx is purified.
On the other hand, put using the numerical expression (4) for the present embodiment for meeting the opinion that inventor newly obtains to calculate SOx
Output SOx_ outExample (embodiment) in, it is shown in solid such as Fig. 7, SOx can be estimated and purify executory SOx uptakes
SOx_ out.It can be said that compared with comparative example, meet the SOx discharging amounts SOx for the opinion that inventor newly obtains_ outTo meet reality
State value.Therefore, compared with comparative example, the SOx uptakes SOx being deduced also can accurately be estimated_ STR.Thus,
According to the present embodiment, the actual state of NOx absorption reduction catalysts 32 can be met holding for SOx purifications is suitably controlled
OK.According to the present embodiment, T1 suitably grasps SOx uptakes SOx at the time of compared with comparative example earlier_ STRReach end
The situation of condition threshold, it can suitably terminate SOx purifications.Further, since can accurately it estimate when SOx purifications perform
SOx uptakes SOx_ STR, so after SOx purifications terminate, also can accurately estimate SOx uptakes SOx_ STR。
[NOx purifications control]
NOx purification control units 70 perform following control：Reduced by making exhaust turn into dense combustion environment with that will be absorbed by NOx
The NOx that type catalyst 32 absorbs come by reduction purification it is innoxious and release so that NOx absorption reduction catalysts 32
NOx absorbabilities are recovered and (control are referred to as into NOx purifications control).
[MAF follows control]
MAF follows control unit 80, and in (1), from the lean burn generally operated to SOx, purification control or NOx are purified under control
Dense combustion state switching during and (2) purify dense combustion state under control or NOx purification controls to generally operating from SOx
During the switching of lean burn, perform according to MAF changes to correct the fuel injection timing of each In-cylinder injector 11 and fuel spray
The control for the amount of penetrating (MAF follows control).
[the emitted dose learning correction of In-cylinder injector]
As shown in figure 8, In-cylinder injector learning correction portion 90 includes learning correction coefficient operational part 91, emitted dose correction unit
92 and learning correction prohibition unit 93.
Learning correction coefficient operational part 91 is in the lean-burn operation of engine 10 based on the reality detected by NOx/ exhaust gas oxygensensors 45
λ value λActWith estimating λ value λEstError delta λ, carry out the learning correction coefficient F of the emitted dose of each In-cylinder injector 11 of computingCorr.
Be vented for lean burn when, because the HC concentration in exhaust is very low, so, by oxidation catalyst 31 carry out HC oxidation it is anti-
The change that λ value is vented caused by answering is small to the degree that can ignore.It is therefore contemplated that having passed through oxidation catalyst 31 and by downstream
Actual λ value λ in the exhaust that the NOx/ exhaust gas oxygensensors 45 of side detectActAnd the presumption λ value λ in the exhaust discharged from engine 10Est
Unanimously.That is, in these actual λ value λActWith estimating λ value λEstIn the case of generating error delta λ, it can assume that to be because to each
Error caused by the instruction emitted dose of In-cylinder injector 11 and the difference of actual ejection amount.
Learning correction coefficient operational part 91 by from presumption λ value λEstSubtract the actual λ detected by NOx/ exhaust gas oxygensensors 45
Value λActError delta λ afterwards is multiplied by learning value gain K1And corrected sensitivity coefficient K2, so as to computing learning value FCorrAdpt
(FCorrAdpt=(λEst- λAct)×K1×K2).In the present embodiment, corrected sensitivity coefficient K2Being will be by NOx/ exhaust gas oxygensensor
The actual λ value λ of 45 detectionsActRead as input signal from corrected sensitivity coefficient chart 91A.In addition, for estimating λ
Value λEstOperating condition according to engine 10 corresponding with engine speed Ne or accelerator open degree Q etc. is come constructive arithmetic.
The learning value F that will be calculated by learning correction coefficient operational part 91CorrAdptIt is sent to learning value chart 91B, and
Study prohibitory sign F described laterProTo close (FPro=0) learning value chart 91B renewal is performed when.
Learning value chart 91B is referenced chart based on engine speed Ne and accelerator open degree Q, is set on the graph
Multiple learning region of with good grounds engine speed Ne and accelerator open degree Q zonings.For these learning region, usage frequency is more
Its scope of region be set narrower, its scope of the few region of usage frequency is set wider.Thus, frequency is being used
Spend more region learning precision to be enhanced, also, effectively prevent from not learning in the less region of usage frequency.
If continuing the not converged λ unstable states within a predetermined range in certain period ground as the λ value of exhaust, learn school
Positive prohibition unit 93 will forbid renewal learning value chart 91B study prohibitory sign FProActivate (FPro=1).
In the present embodiment, prohibitory sign F is learntProIt is activated during any one following condition is set up：(1)
SOx purification marks FSPFor activation, (2) NOx purification marks FNPFor activation, (3) filter regeneration mark FDPFFor activation or
(4) operating condition of engine 10 is transition operation.Because in the state of the establishment of these conditions, actual λ value λActChange
Change causes error delta λ to become big, it is impossible to carries out being based on accurate learning value FCorrAdptLearning value chart 91B renewal.On drawing
Hold up whether 10 be in transient operating state, such as based on the actual λ value λ detected by NOx/ exhaust gas oxygensensors 45ActTime variation amount,
It is determined as transient operating state in the case where the time variation amount is more than predetermined threshold value.
In addition, in the present embodiment, illustrate in study prohibitory sign FProActivation when forbid learning value chart 91B
Renewal, but it is also possible to be configured to forbid learning value FCorrAdptComputing.
Next, illustrate the control flow of the emitted dose learning correction of the In-cylinder injector 11 of present embodiment based on Fig. 9.
In step S300, based on engine speed Ne and accelerator open degree Q etc., to judge whether engine 10 is in lean-burn operation
State.If being in lean-burn operation state, in order to start the computing of learning correction coefficient, into step S310.
In step S310, by from presumption λ value λEstSubtract the actual λ value λ detected by NOx/ exhaust gas oxygensensors 45ActAfterwards
Error delta λ, be multiplied by learning value gain K1And corrected sensitivity coefficient K2, so as to computing learning value FCorrAdpt(FCorrAdpt=
(λEst- λAct)×K1×K2)。
In step s 320, learning value F is judgedCorrAdptAbsolute value | FCorrAdpt| whether in predetermined limitation
In the range of value A.In absolute value | FCorrAdpt| in the case of more than limitation value A, this control is returned and stops this
Study.
In step S330, determine whether to close study prohibitory sign F by learning correction prohibition unit 93Pro.Prohibit in study
Only indicate FProIn the case of for closing (Yes), originally control to perform learning value chart 91B renewal, and advance to step
S340.On the other hand, in study prohibitory sign FProIn the case of for activation (No), this control is without learning value chart 91B's
Update and be returned.
In step S340, the referenced learning value chart 91B (reference pictures based on engine speed Ne and accelerator open degree Q
8) it is updated to the learning value F calculated in step S310CorrAdpt.More specifically, set on learning value chart 91B
Multiple learning region of with good grounds engine speed Ne and accelerator open degree Q division.Preferably usage frequency is more for these learning region
Then its scope is set narrower in region, then its scope is set wider in usage frequency few region.Thereby, it is possible to
Study precision is improved in the more region of usage frequency, effectively can prevent from not learning in the less region of usage frequency
Practise.
In step S350, by using engine speed Ne and accelerator open degree Q as input signal and from learning value chart
The learning value that 91B is read adds " 1 ", so as to computing learning correction coefficient FCorr(FCorr=1+FCorrAdpt).The learning correction system
Number FCorrIt is input into the emitted dose correction unit 92 shown in Fig. 8.
Emitted dose correction unit 92 passes through to pilot injection QPilot, pilot injection QPre, main injection QMain, spray Q afterwardsAfter, it is remote after
Spray QPostEach basic emitted dose be multiplied by learning correction coefficient FCorr, so as to perform the correction of these fuel injection amounts.So,
By using with estimating λ value λEstWith actual λ value λActThe corresponding learning values of error delta λ come to each correction fuel of In-cylinder injector 11
Emitted dose, so as to effectively exclude the deviations such as the deterioration year in year out of each injector 11 or characteristic variations, individual difference.
[MAF correction coefficient]
The computing of MAF correction coefficient operational part 98 purifies MAF desired values MAF when controlling in SOxSPL_TrgtOr target injection
Measure QSPR_TrgtSetting and NOx purification control when MAF desired values MAFNPL_TrgtOr target injection amount QNPR_TrgtSetting in
Used MAF correction coefficient Maf_ Corr。
In the present embodiment, the fuel injection amount of each In-cylinder injector 11 by NOx/ exhaust gas oxygensensors 45 by based on being detected
Actual λ value λActWith estimating λ value λEstError delta λ and correct.But because λ is air and fuel ratio, so, error delta λ
The reason for be not necessarily limited to influence to the instruction emitted dose of each In-cylinder injector 11 and the difference of actual ejection amount.That is, for λ
Error delta λ, not only the error of each In-cylinder injector 11 but also maf sensor 40 may also have an impact.
Figure 10 is the MAF correction coefficient Maf for representing to be carried out by MAF correction coefficient operational part 98_ CorrSetting processing frame
Figure.Correction coefficient setting chart 99 is referenced chart based on engine speed Ne and accelerator open degree Q, is in advance based on experiment etc.
It is set with the MAF corrections system for the sensor characteristics for representing maf sensor 40 corresponding with these engine speeds Ne and accelerator open degree Q
Number Maf_ Corr。
MAF correction coefficient operational part 98 sets engine speed Ne and accelerator open degree Q as input signal from correction coefficient
Determine chart 99 and read MAF correction coefficient Maf_ Corr, also, by MAF correction coefficient Maf_ CorrIt is sent to MAF desired value computings
Portion 62,72 and emitted dose desired value operational part 66,76.Thereby, it is possible to MAF desired values MAF when controlling is purified in SOxSPL_Trgt
Or target injection amount QSPR_Trgt, NOx purification control when MAF desired values MAFNPL_TrgtOr target injection amount QNPR_TrgtSetting
In effectively reflect the sensor characteristics of maf sensor 40.
[other]
In addition, the present invention is not limited to above-mentioned embodiment, can fit without departing from the spirit and scope of the invention
When deformation is implemented.
For example, in the above-described embodiment, closing forced regeneration mark FDPFWhile activate SOx purification mark FSP,
It however, it can be, closing forced regeneration mark FDPFAt the time of or than this earlier at the time of, SOx purification perform control unit 68
Judge SOx uptakes SOx_ STRWhether execution condition threshold (than termination condition threshold value bigger value) has been exceeded, in SOx uptakes
SOx_ STRIn the case of having exceeded execution condition threshold, to activate SOx purification marks FSPAnd the mode for performing SOx purifications is controlled
System, not less than in the case of, due to SOx uptakes SOx_ STRRepresent for perform SOx purification for still have it is more than needed, so with
SOx purification marks F is not activatedSPMode without performing SOx purifications is controlled.Thereby, it is possible to suitably suppress SOx uptakes
SOx_ STRSOx purifications are performed in the case of not comparing more, can be by the interval lengthening of the SOx execution purified, it is possible to increase fire
Expect economy.
In addition, in the above-described embodiment, for example, purified in the SOx that performs afterwards for just carrying out filter forced regeneration,
Then the execution of filter forced regeneration and perform SOx purification, still, the invention is not restricted to this or, inhaled by SOx
The SOx uptakes SOx that receipts amount operational part 67 calculates_ STRIn the case of having exceeded predetermined execution condition threshold, SOx purifications perform
The execution of control unit 68 and filter forced regeneration independently starts the execution of SOx purifications.
In addition, in the above-described embodiment, as NOx catalyst, enumerate exemplified by NOx absorbs reduction catalyst,
But the invention is not restricted to this, NOx catalyst can also be using from urea water into ammonia as reducing agent come to containing in exhaust
Some NOx carry out the selective reduction catalyst (SCR catalyst) of reduction purification.
The application was based on Japan's patent application (Patent 2015-107010) filed in 27 days in 05 month in 2015, by it
Hold and be incorporated herein as reference.
Industrial applicibility
The emission-control equipment of the present invention, can be appropriate in the presumption precision for the SOx uptakes that can improve NOx catalyst
It is useful that ground performs catalyst regeneration process this point.
The explanation of reference
10 engines
11 In-cylinder injectors
12 inlet channels
13 exhaust passages
16 air inlet shutters
24 EGR valves
31 oxidation catalysts
32 NOx absorb reduction catalyst
33 filters
34 exhaust steam injectors
40 maf sensors
45 NOx/ exhaust gas oxygensensors
50 ECU
67 SOx uptake operational parts
68 SOx purifications perform control unit
69 SOx discharging amount calculating sections
Claims (7)
1. a kind of emission-control equipment, for the NOx catalyst being arranged in the exhaust passage of internal combustion engine, performing makes exhaust for it
Temperature rises to desulfurization temperature so that the SOx absorbed by above-mentioned NOx catalyst departs from the catalyst regeneration process removed；
Above-mentioned emission-control equipment includes：
Desulfurization amount calculates part, and it based on by SOx uptakes that NOx catalyst absorbs and representing that absorbed SOx exists
Value after the desulfurization degree multiplication for the ratio being desulfurized in the often predetermined time, above-mentioned catalyst regeneration process is performed to calculate successively
When above-mentioned NOx catalyst in desulfurization amount,
Uptake estimates part, and it calculates the desulfurization amount that part calculates successively using by above-mentioned desulfurization amount, is urged to estimate above-mentioned NOx
The newest SOx uptakes of agent, and
Control unit is performed, it is based on the above-mentioned SOx uptakes being deduced out, to control holding for above-mentioned catalyst regeneration process
OK.
2. emission-control equipment as claimed in claim 1, wherein,
Above-mentioned desulfurization degree according to since above-mentioned catalyst regeneration process perform elapsed time and change.
3. the emission-control equipment as described in claim 1 or claim 2, wherein,
Above-mentioned execution control unit is controlled as follows：In the feelings that above-mentioned SOx uptakes are below termination condition threshold value
Under condition, terminate above-mentioned catalyst regeneration process.
4. the emission-control equipment as described in any one of claims 1 to 3, wherein,
Also calculate part including additional quantity, the additional quantity calculate part calculate successively it is due to exhaust and new by above-mentioned NOx catalyst
The addition SOx uptakes of absorption；
Above-mentioned uptake presumption part is newest to estimate using the addition SOx uptakes that part calculates are calculated by above-mentioned additional quantity
SOx uptakes.
5. emission-control equipment as claimed in claim 4, wherein,
Above-mentioned execution control unit is controlled as follows：Predetermined execution condition threshold is exceeded in above-mentioned SOx uptakes
In the case of value, above-mentioned catalyst regeneration process is performed.
6. the emission-control equipment as described in claim 4 or claim 5, wherein,
Above-mentioned execution control unit is controlled as follows：Above-mentioned SOx uptakes be predetermined execution condition threshold with
In the case of lower, above-mentioned catalyst regeneration process is limited.
7. emission-control equipment as claimed in claim 6, wherein,
The exhaust passage of above-mentioned internal combustion engine also has the filter of arrested particles shape material,
Above-mentioned execution control unit is controlled as follows：Above-mentioned execution condition threshold is exceeded in above-mentioned SOx uptakes
In the case of, then filter recovery process and perform above-mentioned catalyst regeneration process, be above-mentioned execution in above-mentioned SOx uptakes
In the case of below condition threshold, not then above-mentioned filter recovery process and perform above-mentioned catalyst regeneration process, above-mentioned mistake
Filter regeneration processing is the processing for being flared off the particulate material of above-mentioned filter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015107010A JP6604034B2 (en) | 2015-05-27 | 2015-05-27 | Exhaust purification device |
| JP2015-107010 | 2015-05-27 | ||
| PCT/JP2016/065270 WO2016190296A1 (en) | 2015-05-27 | 2016-05-24 | Exhaust purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107614842A true CN107614842A (en) | 2018-01-19 |
| CN107614842B CN107614842B (en) | 2019-11-08 |
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|---|---|---|---|
| CN201680030092.5A Active CN107614842B (en) | 2015-05-27 | 2016-05-24 | Emission-control equipment |
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|---|---|
| JP (1) | JP6604034B2 (en) |
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| WO (1) | WO2016190296A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324689A (en) * | 2022-08-23 | 2022-11-11 | 上海弗列加滤清器有限公司 | Hydrocarbon injection system and control method and application thereof |
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|---|---|---|---|---|
| JP2000265827A (en) * | 1999-03-18 | 2000-09-26 | Nissan Motor Co Ltd | Engine exhaust emission control device |
| JP2002364349A (en) * | 2001-06-08 | 2002-12-18 | Nissan Motor Co Ltd | Exhaust emission control system for internal combustion engine |
| JP2008069737A (en) * | 2006-09-15 | 2008-03-27 | Toyota Motor Corp | Exhaust emission control system for internal combustion engine |
| CN101253313A (en) * | 2005-09-07 | 2008-08-27 | 五十铃自动车株式会社 | Method for controlling desulfurization in exhaust gas purification system, and exhaust gas purification system |
-
2015
- 2015-05-27 JP JP2015107010A patent/JP6604034B2/en active Active
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2016
- 2016-05-24 CN CN201680030092.5A patent/CN107614842B/en active Active
- 2016-05-24 WO PCT/JP2016/065270 patent/WO2016190296A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000265827A (en) * | 1999-03-18 | 2000-09-26 | Nissan Motor Co Ltd | Engine exhaust emission control device |
| JP2002364349A (en) * | 2001-06-08 | 2002-12-18 | Nissan Motor Co Ltd | Exhaust emission control system for internal combustion engine |
| CN101253313A (en) * | 2005-09-07 | 2008-08-27 | 五十铃自动车株式会社 | Method for controlling desulfurization in exhaust gas purification system, and exhaust gas purification system |
| JP2008069737A (en) * | 2006-09-15 | 2008-03-27 | Toyota Motor Corp | Exhaust emission control system for internal combustion engine |
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| CN115324689A (en) * | 2022-08-23 | 2022-11-11 | 上海弗列加滤清器有限公司 | Hydrocarbon injection system and control method and application thereof |
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| JP6604034B2 (en) | 2019-11-13 |
| WO2016190296A1 (en) | 2016-12-01 |
| JP2016223292A (en) | 2016-12-28 |
| CN107614842B (en) | 2019-11-08 |
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