CN109538334A - A kind of system and control method of forward and reverse alternating spray NTP regeneration DPF - Google Patents

A kind of system and control method of forward and reverse alternating spray NTP regeneration DPF Download PDF

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Publication number
CN109538334A
CN109538334A CN201811515419.5A CN201811515419A CN109538334A CN 109538334 A CN109538334 A CN 109538334A CN 201811515419 A CN201811515419 A CN 201811515419A CN 109538334 A CN109538334 A CN 109538334A
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China
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ntp
dpf
regeneration
control module
control valve
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CN201811515419.5A
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Chinese (zh)
Inventor
蔡忆昔
倪思佳
施蕴曦
樊润林
陈祎
季亮
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Jiangsu University
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Jiangsu University
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Priority to CN201811515419.5A priority Critical patent/CN109538334A/en
Publication of CN109538334A publication Critical patent/CN109538334A/en
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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
    • F01N3/0238—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 for regenerating during engine standstill
    • 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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The invention discloses the systems and control method of a kind of forward and reverse alternating spray NTP regeneration DPF, are related to the field of tail gas treatment, which includes diesel engine, after-treatment device, NTP spraying system, power supplier and control system；After diesel engine stop, exhaust heat provides regenerative process required temperature；NTP nozzle is respectively set in the front and back end DPF in NTP spraying system, and generates NTP by gas source of air, and the PM deposited in DPF is removed in oxidation；After-treatment device includes that the bypass pipe being installed in parallel with DPF enables NTP to be redirected back into DPF to connect atmospheric equilibrium pressure difference；Control system realizes the alternating switching of NTP forward direction regeneration DPF and reversed regeneration two kinds of working conditions of DPF by the opening and closing of control electromagnetic valve.The present invention can be effectively improved flow regime of the NTP in DPF, contact NTP with PM more abundant, shorten the reproduction time of DPF, improve NTP utilization rate.Which reduces the axial-temperature gradient during dpf regeneration, is conducive to extend the service life of DPF.

Description

A kind of system and control method of forward and reverse alternating spray NTP regeneration DPF
Technical field
The invention belongs to diesel engine vent gas post-processing technology fields, and in particular, to a kind of forward and reverse alternating spray NTP is again The system and control method of raw DPF.
Background technique
Compared with gasoline engine, diesel engine has a clear superiority in terms of fuel economy, reliability and dynamic property, Duo Beiying For heavy type transport vehicle field.In recent years, as the discharge of diesel engine, noiseproof feature gradually improve, diesel engine is led in Light-duty Vehicle The application in domain is also increasing.In the discharging pollutants of diesel engine, particulate matter (particulate matter, PM) discharge is the most prominent Out, it is tens times of gasoline engine.PM enters after atmosphere, the harmful toxic matters such as acidic oxide, bacterial virus can be adsorbed, with breathing Into human body, Yi Yinfa respiratory disease, while it also will affect environment visibility, the radiation balance of atmosphere.So reducing PM Discharge is always the important topic of diesel exhaust aftertreatment technology.
Diesel particulate trap (diesel particulate filter, DPF) is that one kind is mounted on diesel exhaust gas Filter in system, to the arresting efficiency of PM up to 90% or more, it is considered to be reduce PM at present and discharge most effective post-processing Device.But with the increase of filtration time, PM is deposited on filter medium, and exhaust back pressure rises, and will lead under diesel engine performance Drop.Therefore, the PM deposited in the duct DPF need to be removed in time, this process is known as the regeneration of DPF.
Common regeneration method mainly has hot recycling, catalytic regeneration and cyclic regeneration.Hot recycling reaches clear by the PM that ignites Except purpose need to make DPF internal temperature be increased to 650 DEG C or more such as extra injection fuel or electric heating, energy consumption is high, is easily damaged Filter core.Catalytic regeneration, which refers to, to be coated catalyst on DPF or catalyst is added in fuel, reduces the initiation temperature of PM, but should Method requires height to fuel qualities, the problems such as catalyst sulfur poisoning, PM oxidation is insufficient easily occurs.Cyclic regeneration is in being vented Nitric oxide (NO) be oxidized to nitrogen dioxide (NO2), utilize NO2Strong oxidizing property oxidation removal PM, but effectively operating temperature model It encloses narrow, it is difficult to promote the use of.As it can be seen that there is certain self-defect in traditional dpf regeneration technology.
Low temperature plasma (non-thermal plasma, NTP) technology as a kind of infant industry decontamination means, has The advantages that low energy consumption, without secondary pollution, removal efficiency is high, it is considered to be solve the problems, such as future diesel machine exhaust pollution most before One of technology of scape.NTP generator, by electrion, generates O using air as gas source3、NO2Deng the activity with strong oxidizing property Substance.NTP is passed through inside DPF, the oxidation removal to PM can be realized in the case where being far below PM initiation temperature.
NTP regeneration DPF technology can be divided into on-line regeneration and regenerated offline two ways, and on-line regeneration refers to be transported in diesel engine NTP is passed through inside DPF during row, regenerated offline, which refers to, is passed through NTP inside DPF after diesel engine stop.
When NTP regenerated offline DPF, the PM for being deposited on the middle and back DPF is not easy to be removed, and influences whole regeneration effect.It is main Will be there are two reason: first is that the PM deposition thickness of DPF middle outlet side is greater than inlet side, PM deposition be unevenly distributed；Second is that into The NTP for entering DPF is consumed due to the PM reaction first contacted and itself decomposition, the regenerated NTP number in the middle and back actual participation DPF Amount is reduced.In order to reach preferable regeneration effect, generallys use and extend the reproduction time or improve NTP concentration by gas source of oxygen Method, but the problems such as NTP utilization rate is low, energy consumption increases, increased costs can be brought.
Summary of the invention
In view of the above-mentioned problems, the present invention provides the system and control method of a kind of forward and reverse alternating spray NTP regeneration DPF. This method guarantees that NTP can reversely spray into DPF, by controlling the opening and closing of electromagnetic valve, makes using the bypass pipe balance pressure difference added NTP forward direction sprays into DPF and reversed penetrating DPF alternately, realizes the technical purpose of efficient uniform regeneration DPF.Regenerative process exists It is carried out after diesel engine stop, required temperature is provided by exhaust heat.
A kind of system of forward and reverse alternating spray NTP regeneration DPF, including after-treatment device, NTP spraying system；After described Processing unit includes exhaust pipe, bypass pipe and DPF；DPF is connected on the exhaust pipe；The bypass pipe is in parallel with the DPF, other The entrance and exit of siphunculus is located at the upstream side and downstream side of DPF；The NTP spraying system includes NTP generator, quality Flow controller, gas supply blower, NTP injection general pipeline, the first NTP injection branch pipe, the 2nd NTP injection branch pipe, the first NTP nozzle, 2nd NTP nozzle, water tank and water pump；NTP generator gas outlet is connected with NTP injection general pipeline；The NTP sprays general pipeline Upper parallel communication has the first NTP injection branch pipe and the 2nd NTP injection branch pipe；The first NTP injection branch pipe and the 2nd NTP injection The first NTP nozzle, the 2nd NTP nozzle are separately installed on branch pipe；The first NTP nozzle, the 2nd NTP nozzle are arranged in DPF Upstream side and downstream side, and the first NTP nozzle, the 2nd NTP nozzle are oppositely arranged in exhaust pipe.
Further, the pressure at the both ends DPF is measured by differential pressure pickup；Temperature in DPF passes through temperature sensing Device measures；The differential pressure pickup and temperature sensor are connect by conducting wire with control module.
Further, it is provided with bypass pipe control valve in the bypass pipe, be arranged in the exhaust pipe of the downstream of DPF side Exhaust pipe control valve.
Further, control module respectively with diesel engine, mass flow controller, gas supply blower, water pump, vehicle power supply, Relay, the first NTP control valve, the 2nd NTP control valve, bypass pipe control valve, exhaust pipe control valve are connected；The control mould The control to mass flow controller flow and inversion boosting device voltage can be achieved in block.
Further, the DPF pressure difference signal that the control module is fed back according to differential pressure pickup, diesel engine stop signal, The opening and closing of the dpf temperature signal and built-in control method control NTP spraying system of temperature sensor feedback and NTP regenerate DPF's Working condition.
Further, when NTP reversely regenerates DPF, the exhaust pipe of the upstream side DPF connects atmospheric equilibrium pressure by bypass pipe Difference guarantees that NTP can successfully be redirected back into DPF and remove PM.
Further, the NTP generator is connected by conducting wire with power supplier；The NTP spraying system work When, vehicle power supply provides electric energy to the NTP generator through inversion boosting device, and relay receives control module signal control circuit Disconnection and closure.
Further, the power supplier includes vehicle power supply, inversion boosting device and relay；The vehicle power supply It is connected by conducting wire with inversion boosting device；Relay is provided between the inversion boosting device and NTP generator.
Further, the NTP generator type of cooling is water cooling, and the water pump receives the control module transmission Signal extracts the cooling water in water tank, enters the NTP generator from cooling water inlet, flows through stainless steel tube, sends out NTP Raw device is cooled down, then returns to water tank from cooling water outlet, is recycled.
A kind of control method of system based on forward and reverse alternating spray NTP regeneration DPF, comprising the following steps:
Step 1: rating test is carried out to dpf regeneration system:
For a diesel engine under different operating conditions, the maximum differential pressure at the receptible both ends DPF is different；With diesel engine in rated engine speed Under, the both ends DPF pressure difference upper limit value Δ PhFor the enabling signal of dpf regeneration；Δ P is measured by testhSpecific value, and by its It is stored in control module；
B opens NTP spraying system under diesel engine stop state；The air flow value for being passed through NTP generator is set, just To injection NTP by blank DPF, after the pressure difference of the front and back end DPF is stablized, remember that the pressure difference is Δ P0；Dpf regeneration is set to complete When, the front and back end DPF pressure difference is Δ Pl=250% Δ P0, and by Δ PlIt is stored in control module；
C is using air as gas source, during regenerating DPF using exhaust heat auxiliary NTP, when under the mean temperature of the inside DPF After being down to 250 DEG C, preferable regeneration effect can be obtained by being then turned on NTP spraying system；Temperature sensor measuring point is set to DPF axial direction On the outside of middle part；The measuring point temperature can be lower than the internal temperature of DPF in practical radiation processes, therefore need to demarcate measuring point temperature Th For the initial temperature of the dpf regeneration, and it is deposited into control module；The ThWhen for the inside DPF mean temperature being 250 DEG C, The temperature of temperature sensor measuring point；
Step 2: when diesel engine is run, control module by the both ends differential pressure pickup real-time monitoring DPF pressure differential deltap P, and with The both ends the DPF pressure difference upper limit value Δ P prestored in control modulehCompare, judges whether to need to regenerate；
Step 3: when monitor the both ends DPF pressure difference be greater than or equal to upper limit value Δ PhAfterwards, control module determines that DPF needs Regeneration；In the stopping signal for receiving diesel engine, and T is less than or equal to ThWhen, control module issues signal and starts dpf regeneration； At this point, the first NTP control valve is opened, power supplier, gas supply blower, mass flow controller and water pump start running, NTP Spraying system starting simultaneously carries out recirculated cooling water cooling simultaneously；
Step 4: after opening the first NTP control valve and NTP spraying system, control module timing program starts 10min meter When, NTP enters the first NTP through NTP injection general pipeline and sprays branch pipe, is sprayed by the first NTP nozzle, and forward direction enters DPF, and oxidation is removed The PM of deposition；After control module timing, issues signal and open the 2nd NTP control valve, open bypass pipe control valve, close First NTP control valve closes exhaust pipe control valve；After being finished, then start 10min timing, NTP through NTP spray general pipeline into Enter the 2nd NTP injection branch pipe, sprayed by the 2nd NTP nozzle, be redirected back into DPF, the PM of deposition is removed in oxidation；Timing terminates, control Molding block issues signal and opens the first NTP control valve, opens exhaust pipe control valve, closes the 2nd NTP control valve, closes bypass pipe Control valve.After being finished, control module restarts 10min timing；It follows the above-mentioned course of work to be recycled, realize positive and negative To the technical purpose of alternating spray NTP regeneration DPF；
Step 5: in the course of work of forward and reverse alternating spray NTP regeneration DPF, control module passes through differential pressure pickup reality When monitor the both ends DPF pressure differential deltap P, and within the period of positive injection NTP, differential pressure pickup feeds back to the pressure difference of control module It is effective for being worth Δ P, and with the regeneration target differential pressure value Δ P that prestoreslIt is compared, if Δ P is less than or equal to Δ Pl, then mould is controlled Block thinks that dpf regeneration is completed, and control module issues signal, closes timing, closes NTP spraying system, closes the first NTP control Valve, regeneration ending.
Beneficial effects of the present invention: the system of forward and reverse alternating spray NTP regeneration DPF designed by the present invention is being shut down Afterwards, regenerative process required temperature is provided by exhaust heat, forward and reverse alternating spray NTP enters DPF, can be effectively improved Flow regime of the NTP in DPF contacts NTP with PM more abundant, shortens the reproduction time of DPF, improves NTP utilization rate.This Invention can also reduce the axial-temperature gradient during dpf regeneration, be conducive to extend the service life of DPF.
Detailed description of the invention
Fig. 1 is the general illustration of present system.
Fig. 2 is the structural schematic diagram of NTP generator.
Fig. 3 is control method schematic diagram in control module.
Appended drawing reference is as follows:
100: diesel engine；200: after-treatment device；201: exhaust pipe；202: bypass pipe；203:DPF；300:NTP injection system System；301:NTP generator；302: mass flow controller；303: gas supply blower；304:NTP sprays general pipeline；305: the one NTP Spray branch pipe；306: the two NTP spray branch pipe；307: the one NTP nozzles；308: the two NTP nozzles；309: water tank；310: water Pump；400: power supplier；401: vehicle power supply；402: inversion boosting device；403: relay；500: control system；501: Control module；502: the one NTP control valves；503: the two NTP control valves；504: bypass pipe control valve；505: exhaust pipe control Valve；506: differential pressure pickup；507: temperature sensor；601: cooling water inlet；602: cooling water outlet；603: stainless steel tube； 604: quartz glass tube；605: thin wire gauze；606:NTP generator air inlet；607:NTP generator gas outlet.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention will be further described, but protection scope of the present invention not office It is limited to this.
As shown in Figure 1, being the general illustration of present system, including diesel engine 100, after-treatment device 200, NTP spray Penetrate system 300, power supplier 400 and control system 500.The after-treatment device 200 includes exhaust pipe 201, bypass pipe 202,DPF203.The NTP spraying system 300 include NTP generator 301, mass flow controller 302, gas supply blower 303, NTP sprays general pipeline 304, the first NTP injection branch pipe 305, the 2nd NTP injection branch pipe 306, the first NTP nozzle 307, the 2nd NTP spray Mouth 308, water tank 309, water pump 310.The power supplier 400 includes vehicle power supply 401, inversion boosting device 402, relay 403.The control system 500 includes control module 501, the first NTP control valve 502, the 2nd NTP control valve 503, bypass control Valve 504 processed, exhaust pipe control valve 505, differential pressure pickup 506, temperature sensor 507.
The diesel engine 100 is connected with the exhaust pipe 201 in the after-treatment device 200, is connected on exhaust pipe 201 DPF203.The bypass pipe 202 is in parallel with the DPF203, and entrance and exit is located at the upstream side and downstream of DPF203 Side.Bypass pipe control valve 504 is set in the bypass pipe 202, exhaust pipe control valve 505 is set in the exhaust pipe 201, After the 2nd NTP nozzle 308, before the bypass pipe 202 exports.The setting of the bypass pipe 202 is to work as When NTP reversely regenerates DPF203, the exhaust pipe of the upstream side DPF203 can connect atmospheric equilibrium pressure difference by bypass pipe 202, guarantee NTP can be redirected back into DPF.At this point, the bypass pipe control valve 504 is opened, the exhaust pipe control valve 505 is closed, the bavin The upstream side exhaust pipe 201 that oil machine 100 is connect with the DPF203 connects atmosphere, and the exhaust pipe is swum over under the DPF203 One is formed in exhaust pipe 201 between control valve 505 using the duct DPF203 as the confined space of sole outlet, so that by described The NTP of 2nd NTP nozzle 308 injection successfully can reversely spray into the DPF203 and remove PM.When diesel engine works normally, bypass Pipe control valve 504 is closed, and exhaust pipe control valve 505 is opened, and guarantees the conventional treatment and circulation of exhaust.
In the NTP spraying system 300, the gas supply blower 303 is through the mass flow controller 302 and NTP The air inlet of generator 301 is connected.The gas supply blower 303 receives 501 signal of control module to the NTP generator 301 provide air.NTP generator gas outlet 607 connects NTP injection 304 entrance of general pipeline.The first NTP injection Branch pipe 305, the 2nd NTP injection branch pipe 306 are the NTP injection branch that the NTP sprays the two-way parallel connection that general pipeline 304 is tapped out. When forward direction sprays NTP, NTP is successively by NTP generator gas outlet 607, NTP injection general pipeline 304 and described the One NTP sprays branch pipe 305, is injected into the DPF203 by the first NTP nozzle 307.As contra-injection NTP, NTP Branch pipe 306 successively is sprayed by NTP generator gas outlet 607, NTP injection general pipeline 304 and the 2nd NTP, by The 2nd NTP nozzle 308 is injected into the DPF203.The first NTP nozzle 307 and the 2nd NTP nozzle 308 It is connected to the first NTP by screw thread to spray on the tube wall of branch pipe 305 and the 2nd NTP injection branch pipe 306, respectively Apart from the upstream DPF203, each 100mm in downstream.
The first NTP control valve 502 is installed in the first NTP injection branch pipe 305, the 2nd NTP sprays branch pipe 306 2nd NTP control valve 503 is inside installed.Bypass pipe control valve 504 is installed in the bypass pipe 202.In the exhaust pipe 201 Exhaust pipe control valve 505 is installed.The first NTP control valve 502, the 2nd NTP control valve 503, bypass control Valve 504 processed and the exhaust pipe control valve 505 are connected with the control module 501, are issued according to the control module 501 Signal opens or closes.It is the first NTP control valve 502, the 2nd NTP control valve 503, described when diesel engine 100 is run Bypass pipe control valve 504 is turned off, and the exhaust pipe control valve 505 is opened.Described in 506 real-time monitoring of differential pressure pickup The pressure difference Δ P at the both ends DPF203, and pressure difference signal is fed back into the control module 501.When detecting that Δ P is greater than or equal to Upper limit value Δ PhAfterwards, the control module 501 determines that DPF203 needs to regenerate, then detects the stopping signal of diesel engine.If detection To stopping signal, then judge whether the feedback temperature T of temperature sensor 507 is less than or equal to Th, if so, the control module 501 open the first NTP control valve 502 according to control method, and send a signal to the vehicle power supply 401, the water pump 310, the mass flow controller 302 and the gas supply blower 303 open NTP spraying system.The control module 501 is logical After the timing program set, alternately timing, and then control the first NTP control valve 502, the 2nd NTP control valve 503, the bypass pipe control valve 504, the exhaust pipe control valve 505 open or close, and realize forward and reverse alternating spray NTP The regenerated technical purpose of efficient uniform is carried out to DPF203.
As shown in Fig. 2, being the structural schematic diagram of NTP generator.The NTP generator 301 is dielectric barrier discharge formula, knot Structure composition include cooling water inlet 601, cooling water outlet 602, stainless steel tube 603, quartz glass tube 604, thin wire gauze 605, NTP generator air inlet 606 and NTP generator gas outlet 607；The cooling water inlet 601, cooling water outlet 602 are set respectively It sets at the both ends of the NTP generator 301, stainless steel tube 603 is low-field electrode, and quartz glass tube 604 is block media, thin iron Silk screen 605 is high-field electrode.Stainless steel tube 603 is installed on inside quartz glass tube 604, and coaxially arranges, thin wire gauze 605 are wrapped in 604 outer wall of quartz glass tube.When the NTP spraying system 300 works, vehicle power supply 401 is through inversion boosting device 402 power to NTP generator 301, and relay 403 receives being opened or closed for the signal control circuit of control module 501.Quality The air mass flow that the control of flow controller 302 enters NTP generator 301 is 10L/min.301 type of cooling of NTP generator For water cooling, the water pump 310 receives the signal of the transmission of control module 501, extracts the cooling water in the water tank 309, from The cooling water inlet 601 enters the NTP generator 301, flows through stainless steel tube 603, carries out to the NTP generator 301 It is cooling, then water tank 309 is returned to from cooling water outlet 602, it is recycled.
As shown in figure 3, executing the flow chart of illustrative steps for control method in control module 501.The present invention is forward and reverse Alternating spray NTP enters the PM that DPF203 removes deposition, and there are mainly two types of working condition, states one: positive in regenerative process Injection NTP enters DPF203；State two: contra-injection NTP enters DPF203.The diesel engine 100 then controlled once starting Journey starts.
In step 701, control module 501 obtains the pressure difference signal Δ of the front and back end DPF203 by differential pressure pickup 506 P.Into rate-determining steps 702, control module 501 calls the correspondence pressure difference upper limit value prestored according to the operating condition of diesel engine 100 ΔPh, and be compared with the pressure difference signal Δ P of 506 Real-time Feedback of differential pressure pickup, if Δ P is more than or equal to Δ Ph, then Rate-determining steps enter 703, otherwise return step 701.In step 703, control module 501 detects stopping signal.In step 704 In, if control module 501 detects stopping signal, enter rate-determining steps 705, otherwise returns to rate-determining steps 703.It is controlling In step 705, control module 501 obtains the temperature T of the axial middle part outer layer of DPF203 according to temperature sensor 507.It is walked in control In rapid 706, control module 501 calls the initial temperature T prestoredh, and the temperature signal T fed back with temperature sensor 507 is carried out Compare, if T is less than or equal to Th, then rate-determining steps enter 707, otherwise return step 705.
DPF203 regenerative system of the invention enters the method for DPF203 oxidation PM using forward and reverse alternating spray NTP, and The timing duration of 501 timing program of control module is preferably set as 10min, that is, complete primary positive injection NTP and completes one The duration of secondary contra-injection NTP is 10min.Therefore, during processing, it may appear that two kinds of working conditions, working condition one: NTP enters the first NTP through NTP injection general pipeline 304 and sprays branch pipe 305, is sprayed by the first NTP nozzle 307, is rectified before DPF203 To entrance DPF203 internal oxidation PM；Working condition two: NTP enters the 2nd NTP through NTP injection general pipeline 304 and sprays branch pipe 306, It is sprayed by the 2nd NTP nozzle 308, is redirected back into DPF203 internal oxidation PM from the rear end DPF203.In regenerative process, pass through control Module 501 controls the switching of working condition one and working condition two, until completing regeneration, realizes to PM efficient uniform in DPF203 The technical purpose of removing.
Rate-determining steps 707 open the first NTP control valve 502, after being finished, into rate-determining steps 708, open NTP Spraying system 300.Control module 501 sends a signal to power supplier 400, gas supply blower 303, mass flow controller 302 and water pump 310, it opens NTP spraying system 300 and to carry out recirculated cooling water simultaneously cooling.After being finished, into control Step 709,501 timing program of control module starts 10min timing, that is, enters working condition one, NTP is to DPF203 for forward direction injection It is regenerated.Into rate-determining steps 710, will be prestored in pressure difference signal Δ P and control module 501 that differential pressure pickup 506 is fed back Regeneration target value Δ PlIt is compared, if Δ P is greater than Δ Pl, show that dpf regeneration does not complete, and enter rate-determining steps 711, Judge whether timing terminates, enter step 712 if terminating, otherwise returns to rate-determining steps 710.In rate-determining steps 712, control Module 501 issues signal and opens the 2nd NTP control valve 503, opens bypass pipe control valve 504, closes exhaust pipe control valve 505, Close the first NTP control valve 502.After being finished, 713 are entered step, control module 501 starts again at 10min timing, i.e., Into working condition two, contra-injection NTP regenerates DPF.Into rate-determining steps 714, timing terminates, into rate-determining steps 715, control module 501 issues signal and opens the first NTP control valve 502, opens exhaust pipe control valve 505, closes the 2nd NTP control Valve 503 processed closes bypass pipe control valve 504.After being finished, rate-determining steps 709, rearming one are returned. If Δ P is less than or equal to Δ P in rate-determining steps 710l, then show that dpf regeneration is completed, into rate-determining steps 716, control Molding block 501 closes timing, enters back into rate-determining steps 717, closes NTP spraying system 300.After being finished, walked into control Rapid 718, control module 501 issues signal, closes the first NTP control valve 502.So far, a whole set of forward and reverse alternating spray NTP is efficient Uniformly the control method of regeneration DPF is all finished.
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement Or modification all belongs to the scope of protection of the present invention.

Claims (10)

1. a kind of system of forward and reverse alternating spray NTP regeneration DPF, which is characterized in that including after-treatment device (200) and NTP Spraying system (300)；The after-treatment device (200) includes exhaust pipe (201), bypass pipe (202) and DPF (203)；The row DPF (203) are connected on tracheae (201)；The bypass pipe (202) is in parallel with the DPF (203), the entrance of bypass pipe (202) and Outlet is located at the upstream side and downstream side of DPF (203)；The NTP spraying system (300) include NTP generator (301), Mass flow controller (302), NTP injection general pipeline (304), the first NTP injection branch pipe (305), the 2nd NTP spray branch pipe (306), the first NTP nozzle (307) and the 2nd NTP nozzle (308)；NTP generator gas outlet (607) and NTP injection are total Pipe (304) is connected；Parallel communication has the first NTP injection branch pipe (305) and the 2nd NTP spray on NTP injection general pipeline (304) Penetrate branch pipe (306)；The first NTP is separately installed in first NTP injection branch pipe (305) and the 2nd NTP injection branch pipe (306) Nozzle (307), the 2nd NTP nozzle (308)；The first NTP nozzle (307), the 2nd NTP nozzle (308) are arranged in DPF (203) upstream side and downstream side, and the first NTP nozzle (307), the 2nd NTP nozzle (308) are oppositely arranged on exhaust pipe (201) It is interior.
2. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 1, which is characterized in that the DPF (203) pressure at both ends is measured by differential pressure pickup (506)；Temperature in DPF (203) is surveyed by temperature sensor (507) ?；The differential pressure pickup (506) and temperature sensor (507) are connect by conducting wire with control module (501).
3. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 1, which is characterized in that the bypass pipe (202) it is provided with bypass pipe control valve (504) in, exhaust pipe is set in the exhaust pipe (201) in the DPF (203) downstream side Control valve (505).
4. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 1, which is characterized in that control module (501) respectively with diesel engine (100), mass flow controller (302), gas supply blower (303), water pump (310), vehicle power supply (401), relay (403), the first NTP control valve (502), the 2nd NTP control valve (503), bypass pipe control valve (504), row Tracheae control valve (505) is connected；The control module (501) can be achieved to mass flow controller (302) flow and inversion The control of booster (402) voltage.
5. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 2, which is characterized in that the control mould DPF (203) pressure difference signal that block (501) is fed back according to differential pressure pickup (506), diesel engine (100) stopping signal, temperature sensing DPF (203) temperature signal of device (507) feedback and the opening and closing of built-in control method control NTP spraying system (300) and NTP are again The working condition of raw DPF.
6. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 1, which is characterized in that when NTP is reversed When regenerating (203) DPF, the exhaust pipe of DPF (203) upstream side connects atmospheric equilibrium pressure difference by bypass pipe (202), guarantees NTP DPF (203) can be successfully redirected back into and remove PM.
7. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 1, which is characterized in that the NTP hair Raw device (301) are connected by conducting wire with power supplier (400)；When the NTP spraying system (300) works, vehicle power supply (401) electric energy is provided through inversion boosting device (402) Xiang Suoshu NTP generator (301), relay (403) receives control module (501) disconnection and closure of signal control circuit.
8. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 1, which is characterized in that the power supply supplies It include vehicle power supply (401), inversion boosting device (402) and relay (403) to device (400)；The vehicle power supply (401) is logical Conducting wire is crossed to be connected with inversion boosting device (402)；Relay is provided between the inversion boosting device (402) and NTP generator (301) Device (403).
9. the system of forward and reverse alternating spray NTP regeneration DPF according to claim 1, which is characterized in that the NTP hair Raw device (301) type of cooling is water cooling, and the water pump (310) receives the signal of the control module (501) transmission, extracts water Cooling water in case (309) enters the NTP generator (301) from cooling water inlet (601), flows through stainless steel tube (603), NTP generator (301) is cooled down, then is returned to water tank (309) from cooling water outlet (602), is recycled.
10. the control method of the system of forward and reverse alternating spray NTP regeneration DPF as described in any one of claim 1 to 9, It is characterized in that, comprising the following steps:
Step 1: rating test is carried out to dpf regeneration system:
For a diesel engine (100) under different operating conditions, the maximum differential pressure at receptible DPF (203) both ends is different；With diesel engine (100) Under rated engine speed, DPF (203) both ends pressure difference upper limit value Δ PhFor the enabling signal of dpf regeneration；Δ P is measured by testh's Specific value, and it is deposited into control module (501)；
B is opened NTP spraying system (300) under diesel engine (100) shutdown status；The sky for being passed through NTP generator (301) is set Air flow value, forward direction injection NTP remember the pressure difference after the pressure difference of DPF (203) front and back end is stablized by blank DPF (203) For Δ P0；When setting DPF (203) regeneration completion, DPF (203) front and back end pressure difference is Δ Pl=250% Δ P0, and by Δ PlIt deposits Enter control module (501)；
C is using air as gas source, and during regenerating DPF using exhaust heat auxiliary NTP, mean temperature drops to inside DPF After 250 DEG C, preferable regeneration effect can be obtained by being then turned on NTP spraying system；Temperature sensor (507) measuring point is set to DPF (203) axial middle part outside；The measuring point temperature, can be lower than the internal temperature of DPF (203) in practical radiation processes, therefore need Demarcate measuring point temperature ThFor the DPF (203) regenerated initial temperature, and it is deposited into control module (501)；The ThFor DPF (203) when internal mean temperature is 250 DEG C, the temperature of temperature sensor (507) measuring point；
Step 2: when diesel engine (100) is run, control module (501) passes through differential pressure pickup (506) real-time monitoring DPF (203) Both ends pressure differential deltap P, and with DPF (203) both ends pressure difference upper limit value Δ P for being prestored in control module (501)hCompare, judges whether It needs to regenerate；
Step 3: when monitor DPF (203) both ends pressure difference be greater than or equal to upper limit value Δ PhAfterwards, control module (501) determines DPF (203) it needs to regenerate；In the stopping signal for receiving diesel engine (100), and T is less than or equal to ThWhen, control module (501) hair Signal starts dpf regeneration out；At this point, the first NTP control valve (502) is opened, power supplier (400), gas supply blower (303), mass flow controller (302) and water pump (310) start running, and NTP spraying system (300) starting is simultaneously followed simultaneously Ring cooling water is cooling；
Step 4: after opening the first NTP control valve (502) and NTP spraying system (300), control module (501) timing program is opened The timing of beginning 10min, NTP enters the first NTP injection branch pipe (305) through NTP injection general pipeline (304), by the first NTP nozzle (307) It sprays, forward direction enters DPF (203), and the PM of deposition is removed in oxidation；After control module (501) timing, issues signal and open 2nd NTP control valve (503) is opened bypass pipe control valve (504), and the first NTP control valve (502) is closed, and closes exhaust control Valve (505) processed；After being finished, then start 10min timing, NTP enters the 2nd NTP through NTP injection general pipeline (304) and sprays branch pipe (306), it is sprayed, is redirected back into DPF (203) by the 2nd NTP nozzle (308), the PM of deposition is removed in oxidation；Timing terminates, control Module (501) issues signal and opens the first NTP control valve (502), opens exhaust pipe control valve (505), closes the 2nd NTP control Valve (503) is closed bypass pipe control valve (504)；After being finished, control module (501) restarts 10min timing；It follows The above-mentioned course of work is recycled, and realizes the technical purpose of forward and reverse alternating spray NTP regeneration DPF (203)；
Step 5: in the course of work of forward and reverse alternating spray NTP regeneration DPF (203), control module (501) is passed by pressure difference Sensor (506) real-time monitoring DPF (203) both ends pressure differential deltap P, and within the period of positive injection NTP, differential pressure pickup (506) it is effective for feeding back to the pressure difference Δ P of control module (501), and with the regeneration target differential pressure value Δ P that prestoreslCompared Compared with if Δ P is less than or equal to Δ Pl, then control module (501) thinks that DPF (203) regeneration is completed, and control module (501) issues Signal closes timing, closes NTP spraying system (300), closes the first NTP control valve (502), regeneration ending.
CN201811515419.5A 2018-12-12 2018-12-12 A kind of system and control method of forward and reverse alternating spray NTP regeneration DPF Pending CN109538334A (en)

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CN110985171A (en) * 2019-11-06 2020-04-10 江苏大学 System for regenerating DPF under controllable NTP working condition and control method
CN112228195A (en) * 2020-09-21 2021-01-15 江苏大学 Variable combination control system of engine exhaust aftertreatment and tail gas collection device
CN114658514A (en) * 2022-02-14 2022-06-24 江苏大学 System for DOC carrying NTP combined regeneration DPF and control method
CN114961926A (en) * 2022-05-31 2022-08-30 潍柴动力股份有限公司 Post-processing system and control method for post-processing system
CN116857042A (en) * 2023-08-23 2023-10-10 苏州市申达汽车配件有限公司 Carbon fixation system and control method for efficiently regenerating DPF based on NTP solution

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Application publication date: 20190329