CN102678238A - Engine emission control system and control method - Google Patents
Engine emission control system and control method Download PDFInfo
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- CN102678238A CN102678238A CN2012101569078A CN201210156907A CN102678238A CN 102678238 A CN102678238 A CN 102678238A CN 2012101569078 A CN2012101569078 A CN 2012101569078A CN 201210156907 A CN201210156907 A CN 201210156907A CN 102678238 A CN102678238 A CN 102678238A
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- 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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention relates to a strategy of an offline regeneration DPF (Diesel Particulate Filter) using waste heat of a low-temperature plasma jet system, in particular to a DPF regeneration system. The DPF regeneration system comprises the low-temperature plasma jet system and a control module. The strategy selectively utilizes the exhaust waste heat of a diesel engine and electrical heating to cause the DPF to reach a regeneration temperature. The control module selectively starts an electrical heater and the low-temperature plasma jet system based on pressure difference signals of the front end and the rear end of the DPF, the downstream representation temperature of the DPF and diesel engine starting and stopping signals, and the regeneration process is carried out under the shutdown condition of the diesel engine. After the low-temperature plasma jet system is started, generated active substances are jetted into the front end of the DPF to realize the regeneration of the DPF.
Description
Technical field
The invention belongs to diesel engine reprocessing field, more specifically, relate to the regeneration method of a kind of diesel engine particles catcher (DPF).
Background technique
Description in this background technique that provides is intended to summarize the overall picture that represents present disclosure.In submitting to, possibly not be considered to the each side of existing technology in current alleged inventor's work and this specification, neither clearly be regarded as also not being implied to be the existing technology of destroying present disclosure.
Compare with petrol engine, diesel engine has compact structure, thermal efficiency advantages of higher, and the application area in the power train in vehicle application field constantly enlarges.The emphasis of harmful emission of diesel engine pollutant control be particulate matter (Particulate Matters, PM) and nitrogen oxide (Nitrogen Oxides, NOx).In recent years, the motor vehicle emission rules are constantly strict, and traditional emission controls by improving combustion technology is difficult to satisfy its requirement, must install post-processing technology additional.(Diesel Particulate Filter is DPF) with the PM filtering in the diesel exhaust gas generally to adopt the diesel engine particles catcher at present.After using a period of time, the PM of the last accumulation of DPF is on the increase, and can cause degradation consequence under the increase of diesel exhaust gas back pressure, oil consumption increase, the diesel engine performance, needs to adopt the method for a kind of being called " regeneration " that the PM on the DPF is removed.
Regenerated way is divided into initiative regeneration and passive regeneration.Initiative regeneration is to inject the temperature that energy improves DPF through the outside, and the PM that makes DPF go up deposition removes through burning, and common have electric heating regeneration, micro wave regeneration, oil jetting combustion regeneration; Passive regeneration is meant the Operational Limits of adjustment motor, improves the diesel exhaust gas temperature, realizes the regeneration of DPF, thereby common comprising used fuel oil additive, installed mode such as catalyzer additional and reduce the regeneration start-up temperature and realize dpf regeneration.When PM among the DPF accumulates when too much, the PM burning can produce a large amount of heats in the initiative regeneration process, causes the DPF local temperature too high and burn easily, causes the DPF damage inactivation.Install the passive type cyclic regeneration of catalyzer additional, though reduced the oxidizing temperature of PM, the catalyst activity temperature window is narrower, and catalyzer is had relatively high expectations to fuel qualities to responsive, the easy sulfur poisoning that takes place of element sulphur.Chinese patent CN 101283169 is provided with bypass passageways, the 2nd continuous regenerative DPF of small capacity is set in the exhaust passage of equipment the 1st continuous regenerative DPF diesel engine.When delivery temperature is low, utilize the combustion manner of " premixing compression from ignition combustion mode (Homogeneous Charge Compression Ignition, HCCI) " to reduce the PM discharging, utilize the 2nd continuous regenerative DPF to remove PM.Because relief opening is nearer and volume is little in the 2nd continuous regenerative DPF, so temperature can reach the catalyst activity scope faster, and to generate the PM amount this moment less in addition, controls effect preferably so can obtain.But this method is had relatively high expectations to the accurate control of fuel injection rule, has increased the complexity of after-treatment system.
(Non-thermal Plasma NTP) is a kind of novel industrial decontamination means to lower temperature plasma technology, and the multiple intermediate state energetic particle of its generation can make the chemical reaction that is difficult to realize under the conventional situation be able to start.It mainly is that the NTP generator directly is series at the diesel exhaust gas passage that the at present existing NTP of utilization reduces diesel emission pollutant technology, and various discharging pollutants handled.But because NTP generator work under bad environment, the particulate matter deposition causes problems such as discharge instability, obstruction inefficacy easily.Document " temperature is handled the influence of diesel engine simulated exhaust to the NTP ejecting system " (number: 1000-0925 (2011) 04-0007-05) proposed to handle with the NTP spraying technique influence of diesel engine simulated exhaust by article; Mainly investigated NOx in the simulated exhaust, CO, CO
2, HC change in concentration relation.But this application does not provide the removal method to the PM in the exhaust.Document " the low temperature plasma ejecting system reduces the experimental study of discharging and regeneration DPF " (number: 1001-2222 (2010) 03-0079-04) proposed the method with low temperature plasma online regeneration DPF in the diesel engine operation process by article.But because working conditions change is complicated in the diesel engine operation process, during the regeneration of NTP ejecting system on-line continuous, the NTP flow is compared less with the diesel exhaust gas flow, and most active substance is deflated the waste gas consumption in the pipe, can't concentrate the PM that acts on the DPF.
Summary of the invention
The technical problem that the present invention solves be utilize the diesel exhaust gas waste heat and optionally electric heating make DPF reach regeneration temperature; Utilize NTP to realize the low-temp recovery of diesel engine DPF, thus the drawbacks such as catalyst poisoning of avoiding DPF scaling loss that oil jetting combustion regeneration possibly cause or cyclic regeneration to exist.
A kind of engine emissions control system is used to realize the regeneration of diesel engine DPF, comprises NTP ejecting system (107) and control module.The NTP ejecting system comprises air feed blower fan, NTP generator, inversion boosting device, injection line, nozzle, differential pressure pickup and temperature transducer.Air feed blower fan outlet end links to each other with NTP generator entrance point, connects through injection line between NTP generator exports end and the nozzle.Nozzle is a right-angle elbow pipe, is fixed in through being threaded on the tube wall at the DPF upper reaches.Air feed blower fan power supply terminal links to each other with vehicle power, and power supply blower fan power supply trigger terminal links to each other with control module, after receiving trigger signal, is NTP generator air feed.Inversion boosting device input end is connected with vehicle power; Output terminal is connected with the NTP generator; The control end of inversion boosting device links to each other with control module, and promptly the inversion boosting device is converted into Ac with vehicle power and boosts and then under the control of control module, the NTP generator supplied power.Temperature transducer is arranged in the DPF downstream, and near DPF, differential pressure pickup is installed in the DPF assembly.Temperature transducer is connected with the input terminal of control module with differential pressure pickup, and temperature signal and pressure difference signal are transferred to control module.
Said NTP generator is the dielectric barrier discharge type, and external electrode adopts metallic thin film, is close to block media, and block media adopts quartz tube to process, and interior electrodes use Stainless Steel Tube is processed.Form discharging gap between interior electrode and the block media, air stream is anti-discharge, the formation NTP of giving birth to when discharging gap.
A kind of engine discharge control method utilizes exhaust heat and electric heater to make diesel engine DPF reach regeneration temperature; Utilize NTP generator generation NTP and the NTP active substance that produces is ejected into diesel engine DPF front end, in order to regenerative diesel engine DPF; Utilize differential pressure pickup to confirm diesel engine DPF front end and back end pressure reduction; Utilize the sign temperature in diesel engine DPF downstream in the temperature sensor measurement releasing system, and weigh the DPF inside temperature with this; When control module detects the diesel engine stopping signal, DPF front end and back end pressure reduction surpasses threshold pressure differential, when DPF downstream sign temperature satisfies above preset critical temperature simultaneously, starts the NTP ejecting system.The numerical value of threshold pressure differential, regeneration target pressure reduction and critical temperature is confirmed through calibration experiment in advance, and is stored in the control module.
When said diesel engine DPF front end and back end pressure reduction was less than or equal to regeneration target pressure reduction, the NTP ejecting system quit work.When diesel engine DPF downstream characterize temperature less than preset critical temperature, start air feed blower fan and electric heater, said diesel engine DPF is heated.When characterizing temperature and reach preset critical temperature, close electric heater and keep the air feed fan operation, start the NTP generator simultaneously.Control module does not detect before the diesel engine stopping signal, i.e. during diesel engine running, control module is constantly obtained DPF front end and back end pressure reduction through differential pressure pickup; In carrying out heating or regenerative process, control module stops present procedure at once if detect the diesel engine starting signal, the step when control procedure changes the diesel engine running over to.
The invention has the beneficial effects as follows: be lower than under the initiation temperature of diesel engine discharged particle; Low temperature plasma can be with the diesel engine discharged particle oxidation removal; The present invention utilizes low temperature plasma to realize the low-temp recovery of diesel engine particles catcher (regeneration temperature generally has only about half of electric heating regeneration) based on this character, and electric heating only is used for the auxiliary exhaust waste heat makes grain catcher reach described lower regeneration temperature.The too high scaling loss drawback that causes of grain catcher local temperature that present disclosure can avoid electric heating regeneration, oil spout regeneration to cause also can avoid the cyclic regeneration technology that the drawback of sulfur poisoning takes place when the diesel oil Sulpher content is higher.
Description of drawings
Through describing in detail and accompanying drawing, present disclosure will obtain more detailed understanding.
Fig. 1 is the schematic representation according to the exemplary diesel engine system of the loading NTP waste heat auxiliary regeneration system of the principle of present disclosure.
Fig. 2 is the principle schematic according to the generation gaseous discharge NTP generator of the principle of present disclosure.
Fig. 3 is the exemplary cross sectional view according to the diesel engine DPF assembly of the principle of present disclosure.
Fig. 4 is the illustrative steps schematic representation of being carried out by emission control systems according to the description of the principle of present disclosure.
Reference character:
100: example vehicle 101: diesel engine system 102: diesel engine
103: vent systems 104: gas exhaust manifold 105: diesel oxidation
106:DPF assembly 107:NTP ejecting system 108: control module
109: vehicle power 1071: air feed blower fan 1072:NTP generator
1073: inversion boosting device 1074: injection line 1075: nozzle
1076: differential pressure pickup 1077: temperature transducer 201: external electrode
202: interior electrode 203: block media 301: electric heater
302:DPF 401: confirm Δ P 402: Δ P>=Δ P
c
403: detect stop sign 404: stop sign is arranged? 405: detect and characterize temperature T
a
406:T
a>=T
Ac407: start air feed blower fan and electric heater 408: start the NTP ejecting system
409: T once more
a>=T
Ac410: close electric heater 411: Δ P≤Δ P
s
Embodiment
It in fact only is exemplary below describing, but not is intended to limit value present disclosure and application or purposes.For the purpose of clear, reference character identical in the accompanying drawing will be used to indicate similar elements.As be used for here, phrase " among A, B or the C at least one " should be understood that to mean the logic (A or B or C) of using a nonexcludability logic OR.Should be appreciated that, under the situation of the spirit that does not change present disclosure, can adopt different order to carry out each step.
The term of mentioning in this explanation " module " is meant that the processor of ASIC (ASIC), electronic circuit, the one or more softwares of execution or firmware program is (shared; Proprietary, or in groups) and storage, combinational logic circuit and/or other suitable means of said function is provided.
Existing with reference to Fig. 1, displaying be the illustrative view of functional configuration of example vehicle 100.Vehicle 100 comprises diesel engine system 101.Diesel engine system 101 only as an example, the principle of present disclosure also can be used for the diesel engine system of other type.
Effulent flows into DOC105 from diesel engine 102 through gas exhaust manifold 104.For example, DOC105 can be with the particulate matter partial oxidation of hydrocarbon and/or oxycarbide, and DOC105 also can adjust the ratio of nitrous oxide in the effulent and nitrogen dioxide, to cooperate the use of SCR.Remaining particulate matter is filtered and gathers therein by DPF assembly 106.When satisfying regeneration condition, the method that NTP ejecting system 107 will be through being called regeneration is with the particulate matter removing on the DPF assembly 106.
The NTP ejecting system comprises air feed blower fan 1071, NTP generator 1072, inversion boosting device 1073, injection line 1074 and nozzle 1075.When regeneration started, air feed blower fan 1071 imported NTP generator 1072 with air, and inversion boosting device 1073 is integrated inverter circuit and booster circuit becomes vehicle-mounted DC electrical source and exchange high-frequency and high-voltage power supply the NTP generator is supplied power.Be appreciated that and adopt the high-frequency ac mode usefulness as an example of only supplying power here that can also use other power supply mode is 1072 power supplies of NTP generator.For example, also can adopt high frequency pulse power supply that generator is supplied power.
Particularly with reference to Fig. 2, displaying be the structure principle chart of NTP generator 1072.NTP generator 1072 comprises external electrode 201, interior electrode 202, block media 203.Exemplarily, the external electrode material can adopt thick 0.5mm copper sheet, and interior electrode material can adopt 316
#Stainless steel forms discharging gap between interior electrode and the block media 203.Air gets into discharging gap via generator one end, (for example: O generates active substance
3, NO
2, O
* 2Deng).Be appreciated that generator shown in Figure 2 adopts external electrode overwrite media structure, this structure is usefulness as an example only, electrode overwrite media structure or double electrodes overwrite media structure in also can adopting.
Existing with reference to Fig. 3, displaying be the structural representation of diesel engine DPF assembly 106.DPF assembly 106 comprises electric heater 301 and DPF302.Particularly, DPF302 can adopt and comprise the porous wall streaming structure of being processed by cordierite material; The DPF two ends pressure reduction that control module is measured according to differential pressure pickup 1076 judges whether it reaches preset threshold value; Temperature transducer 1077 is from the DPF302 close together; There are corresponding relation in the temperature of its measurement and DPF302 inside temperature; For the purpose of convenient; Corresponding relation through demarcating the measurement temperature search out temperature transducer 1077 and DPF302 inside temperature in advance also adopts the measurement temperature of temperature transducer 1077 to characterize the DPF302 inside temperature, judges whether to reach the threshold temperature of regeneration startup.
Existing with reference to Fig. 4, displaying be the flow chart that description control module 108 is carried out illustrative steps.In a single day said vehicle starts, and then control procedure begins.In step 401, control module 108 is at first obtained the pressure differential deltap P of DPF302 front end and back end according to differential pressure pickup 1076.Under the different operating modes of diesel engine, the DPF front end and back end pressure reduction that can accept is different; Under a definite operating mode, there is one and can accepts Maximum differential pressure, be referred to as threshold pressure differential Δ P
c, in advance through the Δ P under the different operating modes of the definite diesel engine of calibration experiment
c, and with its MAP storage in control module 108.
Control step gets into 402, and control module is called corresponding Δ P according to diesel engine running operating mode
c, and with Δ P and Δ P
cCompare.If Δ P is greater than Δ P
c, then control step gets into 403, otherwise returns step 401.In step 403, control module 108 detects stop sign.This regeneration strategy is the regenerated offline strategy, and operation when diesel engine quits work is big with regard to the online regeneration extraction flow having avoided touching upon in the technical background like this, can't effectively utilize active substance to make it concentrate the problem on the DPF carbon deposit that acts on.In step 404, judged whether stop sign, if having, control step gets into 405; Otherwise return 403, to be checkedly get into next step after measuring stop sign.
In step 405, control module is obtained near the downstream temperature T DPF302 according to the signal of temperature transducer 1077
aCan receive the heating of exhaust in the DPF304 filtering exhaust process, have temperature gradient along flow direction of exhaust gases; T
aThere is corresponding relation with DPF302 inside mean temperature.Generally speaking, the inner mean temperature of DPF is high more, T
aAlso corresponding high more.So-called here mean temperature is not the whole accurately mean temperature of DPF inside temperature field, and is meant the mean value of the temperature that several temperature sensor measurements of arranging by certain position obtain in DPF, in order to characterize the DPF inside temperature.
The NTP ejecting system can be realized the low-temp recovery of DPF, supposes that in mean temperature be T
i(T for example
i=250 ℃) time can realize the regeneration of DPF, then this moment, temperature transducer 1077 can be measured the T of a correspondence
aValue, this value can be described as critical indicated temperature T
AcT
iAnd T
AcAll can in the after-treatment system calibration experiment, obtain.
Control module is obtained T
aAfter, get into step 406.In step 406, control module is with T
aAnd T
AcCompare.If T
a>=T
Ac, then control step gets into 408, and the operation of NTP ejecting system is regenerated to DPF302.If T
a＜T
Ac, then control step gets into 407.In step 407; Control module is sent instruction; Start air feed blower fan 1071 and electric heater 301; Heat downstream delivery under the effect of air feed blower fan 1071 that electric heater 301 produces, the temperature of temperature transducer 1077 measuring points also can constantly raise, and control module constantly compares T once more through step 409 in this process
a, T
AcIf T
a>=T
Ac, then get into control step 410, close electric heating 301, get into step 408 afterwards; If T
a＜T
Ac, then return step 407, DPF302 is continued heating.
When step 408 is carried out, step 411, promptly control module detects DPF302 two ends pressure differential deltap P also in operation.Because diesel engine quits work under this state, the Δ P pressure reduction that to be air feed blower fan 1071 produce at the DPF302 two ends when the NTP ejecting system air feed with certain flow.When supposing that regeneration reaches predetermined the requirement, DPF302 is Δ P at above-mentioned gas supply flow lower critical pressure reduction
s, then as Δ P≤Δ P
sThe time, regenerative process finishes, otherwise step goes back to 408.
With reference to Fig. 4, each step in the frame of broken lines is when carrying out, and control module is if receive the vehicle launch signal, and then the current executed step stops at once, turns back to the beginning step; When control module does not receive the vehicle launch signal, can continue to carry out; Be that the vehicle launch signal is the reset trigger signal of step in the frame of broken lines.
Those skilled in the art is prone to recognize from above-mentioned detailed description, can exist various ways to carry out the broad teachings crowd of present disclosure.Therefore, though present disclosure has comprised particular example, the true scope of present disclosure does not receive the example limit value, because the technician can clearly understand other transformation behind research accompanying drawing, specification and appended claims.
Claims (7)
1. an engine emissions control system is characterized in that, comprises NTP ejecting system (107) and control module (108); NTP ejecting system (107) comprises air feed blower fan (1071), NTP generator (1072), inversion boosting device (1073), injection line (1074), nozzle (1075), differential pressure pickup (1076) and temperature transducer (1077); Air feed blower fan (1071) outlet end links to each other with NTP generator (1072) entrance point through pipeline, connects through injection line between NTP generator (1072) outlet end and the nozzle (1075); Nozzle (1075) is a right-angle elbow pipe, is fixed in through being threaded on the tube wall at DPF (302) upper reaches; Differential pressure pickup (1076) is installed in the DPF assembly (106); Air feed blower fan (1071) power supply terminal links to each other with vehicle power (109), and power supply blower fan (1071) power supply trigger terminal links to each other with control module (108), after receiving trigger signal, is NTP generator (1072) air feed; Inversion boosting device (1073) input end is connected with vehicle power (109), and output terminal is connected with NTP generator (1072), and the control end of inversion boosting device (1073) links to each other with control module (108); Temperature transducer (1077) is arranged at DPF (302) downstream; And near DPF (302); Temperature transducer (1077) is connected with the input terminal of differential pressure pickup (1076) with control module (108), and temperature signal and pressure difference signal are transferred to control module (108).
2. a kind of engine emissions control system according to claim 1; It is characterized in that; Said NTP generator (1072) is the dielectric barrier discharge type, and external electrode (201) adopts metallic thin film, is close to block media (203); Block media (203) adopts quartz tube to process, and interior electrode (202) adopts Stainless Steel Tube to process; Form discharging gap between interior electrode (202) and the block media (203), air stream is anti-discharge, the formation NTP of giving birth to when discharging gap.
3. adopt the controlling method of the described a kind of engine emissions control system of claim 1, it is characterized in that, utilize exhaust heat and electric heater (301) to make diesel engine DPF (302) reach regeneration temperature; Utilize NTP generator (1072) generation NTP and the NTP active substance that produces is ejected into diesel engine DPF (302) front end, in order to regenerative diesel engine DPF (302); Utilize differential pressure pickup (1076) to confirm the interior front end and back end of diesel engine DPF (302) pressure reduction; Utilize temperature transducer (1077) to measure the sign temperature in diesel engine DPF (302) downstream in the releasing system; When control module (108) detects diesel engine (102) stopping signal, DPF (302) front end and back end pressure reduction surpasses threshold pressure differential, when DPF (302) downstream sign temperature satisfies above preset critical temperature simultaneously, starts NTP ejecting system (107); The numerical value of threshold pressure differential, regeneration target pressure reduction and critical temperature is confirmed through calibration experiment in advance, and is stored in the control module (108).
4. a kind of engine discharge control method according to claim 3 is characterized in that, when said diesel engine DPF (302) front end and back end pressure reduction was less than or equal to regeneration target pressure reduction, NTP ejecting system (107) quit work.
5. a kind of engine discharge control method according to claim 3; It is characterized in that; When diesel engine DPF (302) downstream characterize temperature less than preset critical temperature, start air feed blower fan (1071) and electric heater (301), said diesel engine DPF (302) is heated.
6. a kind of engine discharge control method according to claim 3 is characterized in that, when characterizing temperature and reach preset critical temperature, closes electric heater (301) and keeps air feed blower fan (1071) operation, starts NTP generator (1072) simultaneously.
7. a kind of engine discharge control method according to claim 3; It is characterized in that; Control module (108) does not detect before diesel engine (102) stopping signal; When being diesel engine (102) running, control module (108) is constantly obtained DPF (302) front end and back end pressure reduction through differential pressure pickup (1076); In carrying out heating or regenerative process, control module (108) stops present procedure at once if detect diesel engine (102) actuating signal, the step when control procedure changes diesel engine (102) running over to.
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