CN102678238B - Engine emission control system and control method - Google Patents
Engine emission control system and control method Download PDFInfo
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- CN102678238B CN102678238B CN201210156907.8A CN201210156907A CN102678238B CN 102678238 B CN102678238 B CN 102678238B CN 201210156907 A CN201210156907 A CN 201210156907A CN 102678238 B CN102678238 B CN 102678238B
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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
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- 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 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
The description of the background technique providing at this is intended to summarize the overall picture that represents present disclosure.The each side that may not be considered to prior art in current alleged inventor's work and this specification in submitting to, neither is clearly considered as not also being implied to be the prior art of destroying present disclosure.
Compared with petrol engine, diesel engine has compact structure, thermal efficiency advantages of higher, constantly expands in the application area in power train in vehicle application field.The emphasis of harmful emission of diesel engine pollutant control is particulate matter (Particulate Matters, PM) and nitrogen oxide (Nitrogen Oxides, NOx).In recent years, motor vehicle emission rules are constantly strict, and traditional emission controls by improving combustion technology is difficult to meet its requirement, must install post-processing technology additional.Generally adopt at present diesel engine particles catcher (Diesel Particulate Filter, DPF) by the PM filtering in diesel exhaust gas.Use after a period of time, the PM of the upper accumulation of DPF is on the increase, and can cause degradation consequence under the increase of diesel exhaust gas back pressure, oil consumption increase, diesel engine performance, and the method that need to adopt one to be called " regeneration " is removed the PM on DPF.
Regenerated way is divided into initiative regeneration and passive regeneration.Initiative regeneration is the temperature that improves DPF by outside Implantation Energy, and the PM of the upper deposition of DPF is removed by burning, common are electric heating regeneration, micro wave regeneration, oil jetting combustion regeneration; Passive regeneration refers to adjusts the Operational Limits of motor, improves diesel exhaust gas temperature, realizes the regeneration of DPF, thereby common comprising used fuel oil additive, installs the modes such as catalyzer additional and reduce regeneration start-up temperature and realize dpf regeneration.When PM in DPF accumulates when too much, in initiative regeneration process, PM burning can produce amount of heat, easily causes DPF local temperature too high and burn, and causes DPF damage inactivation.Install the passive type cyclic regeneration of catalyzer additional, although reduced the oxidizing temperature of PM, catalyst activity temperature window is narrower, and catalyzer more responsive to element sulphur, easily there is sulfur poisoning, fuel qualities is had relatively high expectations.Chinese patent CN 101283169 arranges 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.In the time that delivery temperature is lower, utilize the combustion manner of " premixing is compressed from ignition combustion mode (Homogeneous Charge Compression Ignition, HCCI) " to reduce PM discharge, utilize the 2nd continuous regenerative DPF to remove PM.Because relief opening in the 2nd continuous regenerative DPF is compared with near and volume is little, therefore temperature can reach catalyst activity scope faster, now generates PM amount less, therefore can obtain good control effect in addition.But the method is had relatively high expectations to the accurate control of fuel oil jet law, has increased the complexity of after-treatment system.
Lower temperature plasma technology (Non-thermal Plasma, NTP) is a kind of novel industrial decontamination means, and the multiple intermediate state energetic particle of its generation can make the chemical reaction that is difficult to realization under conventional situation be started.It is mainly that NTP generator is directly series to diesel exhaust gas passage that the at present existing NTP of utilization reduces Emissions technology, and various discharging pollutants processed.But due to NTP generator work under bad environment, particulate matter deposition easily causes discharge instability, blocks the problems such as inefficacy.Document " temperature is processed the impact of diesel engine simulated exhaust on NTP ejecting system " (article numbering: 1000-0925(2011) 04-0007-05) proposed to process by NTP spraying technique the impact of diesel engine simulated exhaust, mainly investigate NOx in simulated exhaust, CO, CO
2, HC change in concentration relation.But this application does not provide removal method to the PM in exhaust.Document " low temperature plasma ejecting system reduces the experimental study of discharge and regeneration DPF " (article numbering: 1001-2222(2010) 03-0079-04) proposed the method with low temperature plasma on-line regeneration DPF in diesel engine operation process.But due to working conditions change complexity in diesel engine operation process, when the regeneration of NTP ejecting system on-line continuous, NTP flow and diesel exhaust gas flow are compared little, and most active substance is deflated the waste gas consumption in pipe, cannot concentrate the PM acting on DPF.
Summary of the invention
The present invention solve technical problem be utilize 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 the catalyst poisoning that the DPF scaling loss of avoiding oil jetting combustion to regenerate may causing or cyclic regeneration exist.
A kind of engine emissions control system, for realizing the regeneration of diesel engine DPF, comprises NTP ejecting system (107) and control module.NTP ejecting system comprises air feed blower fan, NTP generator, inversion boosting device, injection line, nozzle, differential pressure pickup and temperature transducer.Air feed fan outlet end is connected with NTP generator entrance point, between NTP generator exports end and nozzle, connects by injection line.Nozzle is a right-angle elbow pipe, is threaded connection on the tube wall that is fixed on DPF upstream.Air feed blower fan power supply terminal is connected with vehicle power, is connected with control module for electric fan power supply trigger terminal, and be NTP generator air feed receiving after trigger signal.Inversion boosting device input end is connected with vehicle power, output terminal is connected with NTP generator, the control end of inversion boosting device is connected with control module, inversion boosting device vehicle power is converted into Ac and boost after under the control of control module, NTP generator is powered.Temperature transducer is arranged in DPF downstream, and near DPF, differential pressure pickup is installed in 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.
Described NTP generator is dielectric barrier discharge type, and external electrode adopts metallic thin film, is close to block media, and block media adopts quartz tube to make, and interior electrode adopts Stainless Steel Tube to make.Between interior electrode and block media, form discharging gap, air stream is anti-raw electric discharge in the time of discharging gap, forms NTP.
A kind of engine discharge control method, utilizes exhaust heat and electric heater to make diesel engine DPF reach regeneration temperature; Utilize NTP generator produce NTP and the NTP active substance of generation is ejected into diesel engine DPF front end, in order to regenerative diesel engine DPF; Utilize differential pressure pickup to determine diesel engine DPF front end and back end pressure reduction; Utilize the sign temperature in diesel engine DPF downstream in temperature sensor measurement releasing system, and weigh DPF inside temperature with this; In the time that control module detects that diesel engine stop signal, DPF front end and back end pressure reduction exceed threshold pressure differential, DPF downstream and characterizes temperature and exceed default critical temperature and meet simultaneously, start NTP ejecting system.The numerical value of threshold pressure differential, regeneration target pressure reduction and critical temperature is determined by calibration experiment in advance, and is stored in control module.
In the time that described diesel engine DPF front end and back end pressure reduction is less than or equal to regeneration target pressure reduction, NTP ejecting system quits work.In the time that diesel engine DPF downstream sign temperature is less than default critical temperature, start air feed blower fan and electric heater, described diesel engine DPF is heated.In the time that sign temperature reaches default critical temperature, close electric heater and keep air feed fan operation, start NTP generator simultaneously.Before control module does not detect diesel engine stop signal, i.e., when diesel engine running, control module is constantly obtained DPF front end and back end pressure reduction by differential pressure pickup; Carrying out in heating or regenerative process, if control module detects diesel engine starting signal, stop at once present procedure, step when control procedure proceeds to diesel engine running.
The invention has the beneficial effects as follows: under the initiation temperature lower than diesel engine discharged particle, low temperature plasma can be by diesel engine discharged particle oxidation removal, based on this character, the present invention utilizes low temperature plasma to realize the low-temp recovery of diesel engine particles catcher (regeneration temperature generally only has the half left and right of electric heating regeneration), and electric heating is only used for 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 be avoided electric heating regeneration, oil spout to regenerate causing, also can avoid cyclic regeneration technology that the drawback of sulfur poisoning occurs in the time that diesel oil Sulpher content is higher.
Accompanying drawing explanation
By the detailed description and the accompanying drawings, present disclosure will obtain more detailed understanding.
Fig. 1 is according to the schematic diagram of the exemplary diesel engine system of the loading NTP waste heat auxiliary regeneration system of the principle of present disclosure.
Fig. 2 is according to the principle schematic of the generation gaseous discharge NTP generator of the principle of present disclosure.
Fig. 3 is according to the exemplary cross sectional view of the diesel engine DPF assembly of the principle of present disclosure.
Fig. 4 is the illustrative steps schematic diagram 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: determine Δ P 402: Δ P>=Δ P
c?
403: detect stop sign 404: have stop sign? 405: detect and characterize temperature T
a
406:T
a>=T
ac407: start air feed blower fan and electric heater 408: start NTP ejecting system
409: T again
a>=T
ac410: close electric heater 411: Δ P≤Δ P
s
Embodiment
It is in fact only exemplary below describing, but not is intended to limit value present disclosure and application or purposes.For clarity, in accompanying drawing, identical reference character will be used to indicate similar element.As for herein, phrase " at least one in A, B or C " should be understood to mean the logic (A or B or C) that uses a nonexcludability logic OR.Should be appreciated that, in the case of not changing the spirit of present disclosure, can adopt different order to carry out each step.
The term " module " of mentioning in this explanation refers to that the processor of specific integrated circuit (ASIC), electronic circuit, the one or more software of execution or firmware program is (shared, proprietary, or in groups) and storage, combinational logic circuit and/or other suitable means of described function is provided.
Referring now 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 is only as example, and 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 by the particulate matter partial oxidation of hydrocarbon and/or oxycarbide, and DOC105 also can adjust the ratio of the nitrous oxide in effulent and nitrogen dioxide, to coordinate the use of SCR.Remaining particulate matter is filtered and gathers therein by DPF assembly 106.While meeting regeneration condition, NTP ejecting system 107 by the method by being called regeneration by the particulate matter removing on DPF assembly 106.
NTP ejecting system comprises air feed blower fan 1071, NTP generator 1072, inversion boosting device 1073, injection line 1074 and nozzle 1075.When regeneration starts, air is imported NTP generator 1072 by air feed blower fan 1071, and inversion boosting device 1073 is integrated inverter circuit and booster circuit becomes Vehicular direct-current power supply to exchange high-frequency and high-voltage power supply NTP generator is powered.Being appreciated that and adopting high-frequency ac mode only to power as example use herein, can also be that NTP generator 1072 is powered by other power supply mode.For example, also can adopt high frequency pulse power supply to power to generator.
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, 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 block media 203.Air enters discharging gap via generator one end, (for example: O generates active substance
3, NO
2, O
* 2deng).Be appreciated that the generator shown in Fig. 2 adopts external electrode overwrite media structure, this structure, only as example use, also can adopt interior electrode overwrite media structure or double electrodes overwrite media structure.
Referring now 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 made up of cordierite material; The DPF two ends pressure reduction that control module is measured according to differential pressure pickup 1076 judges whether it reaches default threshold value; Temperature transducer 1077 is from DPF302 close together, there is corresponding relation in the temperature of its measurement and DPF302 inside temperature, for the purpose of convenient, search out the measurement temperature of temperature transducer 1077 and the corresponding relation of DPF302 inside temperature and adopt the measurement temperature of temperature transducer 1077 to characterize DPF302 inside temperature by demarcating in advance, judge whether to reach the threshold temperature that regeneration starts.
Referring now to Fig. 4, displaying be to describe control module 108 to carry out the flow chart of illustrative steps.Once described vehicle starts, control procedure starts.In step 401, first control module 108 obtains 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 difference that can accept; Under a definite operating mode, there is one and can accept Maximum differential pressure, be referred to as threshold pressure differential Δ P
c, in advance by the Δ P under the different operating modes of the definite diesel engine of calibration experiment
c, and its MAP data are stored in control module 108.
Control step and enter 402, control module is called corresponding Δ P according to diesel engine Operation Conditions
c, and by Δ P and Δ P
ccompare.If Δ P is greater than Δ P
c, control step and enter 403, otherwise return to step 401.In step 403, control module 108 detects stop sign.This regeneration strategy is regenerated offline strategy, operation in the time that diesel engine quits work, so just avoided the on-line regeneration extraction flow of touching upon in technical background large, cannot effectively utilize active substance to make its concentrated problem acting on DPF carbon deposit.In step 404, judge whether stop sign, if had, controlled step and enter 405; Otherwise return to 403, to be checkedly enter next step after measuring stop sign.
In step 405, control module is according near the downstream temperature T signal acquisition DPF302 of temperature transducer 1077
a.In DPF304 filtering exhaust process, can be subject to the heating of exhaust, 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 higher, T
aalso corresponding higher.So-called mean temperature is not the accurate mean temperature of entirety of DPF inside temperature field herein, and refers to the mean value of the temperature that several temperature sensor measurements of arranging by certain position obtain in DPF, in order to characterize DPF inside temperature.
NTP ejecting system can be realized the low-temp recovery of DPF, supposes that in mean temperature be T
i(for example T
i=250 ℃) time can realize the regeneration of DPF, now temperature transducer 1077 can be measured a corresponding T
avalue, this value can be described as critical indicated temperature T
ac.T
iand T
acall can in after-treatment system calibration experiment, obtain.
Control module is obtained T
aafter, enter step 406.In step 406, control module is by T
aand T
accontrast.If T
a>=T
ac, control step and enter the operation of 408, NTP ejecting system, DPF302 is regenerated.If T
a< T
ac, control step and enter 407.In step 407, control module is sent instruction, start air feed blower fan 1071 and electric heater 301, the heat that electric heater 301 produces transmits downstream under the effect of air feed blower fan 1071, the temperature of temperature transducer 1077 measuring points also can constantly raise, and in this process, control module constantly compares T again by step 409
a, T
ac.If T
a>=T
ac, enter and control step 410, close electric heating 301, enter afterwards step 408; If T
a< T
ac, return to step 407, DPF302 is continued to heating.
When step 408 is carried out, step 411, control module detects DPF302 two ends pressure differential deltap P also in operation.Because diesel engine under this state quits work, Δ P is the pressure reduction that air feed blower fan 1071 produces at DPF302 two ends during to NTP ejecting system air feed with certain flow.While supposing that regeneration reaches pre-provisioning request, DPF302 is Δ P at above-mentioned gas supply flow lower critical pressure reduction
s, as Δ P≤Δ P
stime, regenerative process finishes, otherwise step goes back to 408.
With reference to Fig. 4, each step in dotted line frame is in the time carrying out, if control module receives vehicle launch signal, current execution step stops at once, turns back to beginning step; When control module does not receive vehicle launch signal, can continue to carry out; Be that vehicle launch signal is the reset trigger signal of step in dotted line frame.
Those skilled in the art easily recognizes from above-mentioned detailed description, can exist various ways to carry out the broad teachings crowd of present disclosure.Therefore, although present disclosure has comprised specific example, the true scope of present disclosure is not subject to example limit value, because technician can have a clear understanding of other transformation after 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 is connected with NTP generator (1072) entrance point by pipeline, between NTP generator (1072) outlet end and nozzle (1075), connects by injection line; Nozzle (1075) is a right-angle elbow pipe, is threaded connection and is fixed on DPF(302) on the tube wall of upstream; Differential pressure pickup (1076) is installed in DPF assembly (106), and DPF assembly (106) comprises electric heater (301) and DPF(302); Air feed blower fan (1071) power supply terminal is connected with vehicle power (109), is connected with control module (108) for electric fan (1071) power supply trigger terminal, and be NTP generator (1072) air feed receiving after trigger signal; 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) is connected 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 control module (108) with differential pressure pickup (1076), 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, described NTP generator (1072) is dielectric barrier discharge type, external electrode (201) adopts metallic thin film, be close to block media (203), block media (203) adopts quartz tube to make, and interior electrode (202) adopts Stainless Steel Tube to make; Between interior electrode (202) and block media (203), form discharging gap, air stream is anti-raw electric discharge in the time of discharging gap, forms NTP.
3. adopt the controlling method of a kind of engine emissions control system claimed in 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) produce NTP and the NTP active substance of generation is ejected into diesel engine DPF(302) front end, in order to regenerative diesel engine DPF(302); Utilize differential pressure pickup (1076) to determine diesel engine DPF(302) interior front end and back end pressure reduction; Utilize temperature transducer (1077) to measure diesel engine DPF(302 in releasing system) the sign temperature in downstream; When control module (108) detects diesel engine (102) stopping signal, DPF(302) front end and back end pressure reduction exceedes threshold pressure differential, DPF(302) downstream is when characterizing temperature and exceeding default critical temperature and meet simultaneously, starts NTP ejecting system (107); The numerical value of threshold pressure differential, regeneration target pressure reduction and critical temperature is determined by calibration experiment in advance, and is stored in control module (108).
4. a kind of engine discharge control method according to claim 3, is characterized in that, as described diesel engine DPF(302) front end and back end pressure reduction is while being less than or equal to regeneration target pressure reduction, and NTP ejecting system (107) quits work.
5. a kind of engine discharge control method according to claim 3, it is characterized in that, as diesel engine DPF(302) downstream is when characterizing temperature and being less than default critical temperature, starts air feed blower fan (1071) and electric heater (301), to described diesel engine DPF(302) heat.
6. a kind of engine discharge control method according to claim 3, is characterized in that, in the time that sign temperature reaches default 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, before control module (108) does not detect diesel engine (102) stopping signal, while being diesel engine (102) running, control module (108) is constantly obtained DPF(302 by differential pressure pickup (1076)) front end and back end pressure reduction; In execution heating or regenerative process, control module (108), if detect diesel engine (102) actuating signal, stops current heating or regenerative process program at once, step when control procedure proceeds to diesel engine (102) running.
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| CN105221220B (en) * | 2015-06-05 | 2017-10-20 | 江苏大学 | A kind of dpf regeneration method based on NTP technologies |
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| CN105927326B (en) * | 2016-06-17 | 2020-06-23 | 浙江大学 | Automatic regeneration device and regeneration method for DPF of marine diesel engine |
| CN106437948B (en) * | 2016-11-01 | 2019-04-30 | 江苏大学 | A kind of dpf regeneration system and control method |
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| CN108533363B (en) * | 2018-06-04 | 2023-08-18 | 江苏大学 | Vehicle-mounted DPF online regeneration system and control method |
| CN109653839B (en) * | 2018-12-11 | 2021-07-27 | 联合汽车电子（重庆）有限公司 | Particle catcher regeneration control system and method |
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| CN111946428B (en) * | 2020-07-14 | 2022-01-11 | 江苏大学 | DPF (diesel particulate filter) offline regeneration temperature control system and control method |
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