CN106837496B - Engine particulate purifying regeneration control system - Google Patents

Engine particulate purifying regeneration control system Download PDF

Info

Publication number
CN106837496B
CN106837496B CN201710062818.XA CN201710062818A CN106837496B CN 106837496 B CN106837496 B CN 106837496B CN 201710062818 A CN201710062818 A CN 201710062818A CN 106837496 B CN106837496 B CN 106837496B
Authority
CN
China
Prior art keywords
carbon black
pressure difference
load
module
ash content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710062818.XA
Other languages
Chinese (zh)
Other versions
CN106837496A (en
Inventor
施华传
顾欣
龚笑舞
胡川
周奇
马二林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAW Group Corp
Original Assignee
FAW Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN201710062818.XA priority Critical patent/CN106837496B/en
Publication of CN106837496A publication Critical patent/CN106837496A/en
Application granted granted Critical
Publication of CN106837496B publication Critical patent/CN106837496B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • 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 present invention relates to a kind of engine particulate purifying regeneration control system, can the carbon black load to particulate filter carry out accurate estimation and monitoring, with the suitable regeneration opportunity of determination.The present invention judges whether differential pressure pickup signal is reliable using average noise energy intensity, and when differential pressure pickup signal is reliable, the load of carbon black is calculated using particulate filter pressure difference signal；When pressure difference signal is unreliable, the value added of carbon black load is determined using model, and accumulates calculating.Pressure difference noise energy is used to adjust pressure difference low-pass filtering bandwidth in real time, increases pressure difference signal precision after filtering.Filtered pressure difference signal and delivery temperature and capacity construct carbon black model, obtain particulate filter and load total amount.Invention also contemplates that ash content changes influence to carbon black load, the variation of pressure difference caused by ash content is scaled and causes same equal-pressure-difference equivalent carbon black load when changing, and removes the equivalent carbon black load of ash content, with obtain accurately with reliable carbon black load.

Description

Engine particulate purifying regeneration control system
Technical field
The present invention relates to a kind of engine particulate purifying regeneration control systems, belong to the control of After-treatment technics DPF system Technical field.
Background technique
The tightened up emission regulation (including to cost, limitation of oil consumption and pollutant) that China introduces just becomes engine The driving force of market transform.In view of lower Particulate Emission, engine needs advanced post-processing technology to be adapted (example therewith NO was used due to post-processing technology such as in recent yearsxIt is greatly diminished with the content of PM).Available engine is in exhaust system Exhaust micro particle filter device is provided in system, purpose is to reduce the level of particulate matter for being discharged into atmosphere.
In order to improve the service life of exhaust gas particle filter, after microparticles collection device has accumulated certain carbon black, need Exhaust combustion processing is carried out with initiative regeneration capturing device, engine control module can control engine and promote exhaust gas particle mistake The temperature value predetermined level of filter completes its regeneration.
Due to the particle matter of overload filter regeneration when can generate high temperature and deteriorate filter ceramic so that filter Service life reduction；And the regeneration of too frequent will lead to engine oil dilution, to cause engine components abrasion aggravation And it breaks down.Therefore, it is necessary to service-strong particle purifying regeneration control system come to the carbon black load of particulate filter into Row monitoring, with the suitable regeneration opportunity of determination.
When patent CN1734067A disclosed in Nissan provides a kind of determining particulate filter carbon black to control regeneration The method of machine calculates the load of carbon black using particulate filter pressure difference signal when differential pressure pickup is reliable；When pressure difference is believed When number unreliable, the value added of carbon black load is determined using load and revolving speed, and carry out accumulation calculating.And pressure difference signal can By whether judgement, then realized using preset vehicle speed threshold value (speed be greater than threshold value think reliable；Speed is less than threshold value and thinks not Reliably).
Patent CN101598058 disclosed in Ford provides a kind of method for controlling reproduction of determining carbon black, basic Thinking is identical as Nissan, and determination whether difference is pressure difference signal reliably, and Ford thinks, in stable situation Under, pressure difference signal is true and reliable, and under transient condition, due to hydrodynamic characteristic unstable in its exhaust system with And the effect of the high time constant (High Time Constants) of sensor, it will lead to the inaccurate of pressure difference signal measured value Property；When extraction flow is smaller, differential pressure pickup work deteriorates pressure difference signal precision.Cause This is exported using the amounts of carbon black that pressure difference estimation obtains as particulate filter load in engine steady state work；Work as engine In transient state or the smaller work of extraction flow, the reliable carbon black calculated value determined using pressure differential method makes as initial build amount Smoke intensity increment is determined based on load and revolving speed with carbon black model, and operating condition/environmental correction is carried out to final output.
The patent application CN101936207B of ten thousand engine intellectual property Co., Ltd, state, the U.S. additionally provides another determination The method of pressure difference reliability defines the concept of restriction sensitivity to assess the reliability of pressure difference signal, and restriction sensitivity is fixed Justice is the change value of pressure that particle filter exhaust is flowed through based on previous time and current time.When sensitivity be decreased below it is pre- When determining threshold value, illustrate pressure difference signal poor reliability, the method for determining carbon black will be converted to from based on pressure differential detection based on model Carbon black accumulates estimation algorithm detection.
The patent application CN101458108 of modern Kia company provides a kind of side for measuring particulate filter dischargeable capacity Method, there are two types of the particles in particulate filter, and one is carbon black (soot), another kind is ash content (ash), wherein due to ash content without By initiative regeneration, therefore in vehicle operation, the dischargeable capacity of particulate filter constantly becomes smaller method, so in determination Before the load of diesel particulate filter, first to determine dischargeable capacity and remove dischargeable capacity caused by ash content become smaller it is negative to carbon black The influence of lotus amount.The method of the measurement particulate filter dischargeable capacity of patent disclosure is, by being caused after monitoring regeneration by ash content Pressure difference situation of change and extraction flow calculate the situation of change of ash content coefficient, and by using the variable quantity of ash content coefficient It accumulates to calculate the dischargeable capacity of particulate filter.
In the patent that Nissan, Ford and ten thousand engine intellectual property Co., Ltd, state, the U.S. announce, proposition Particulate filter load detection and the method for determination, substantially process is identical, i.e., when differential pressure pickup is reliable, using particle Filter differential pressure signal calculates the load of carbon black；When pressure difference signal is unreliable, using the carbon black based on load and revolving speed Model determines the value added of carbon black load, and carries out accumulation calculating, therefore the method has universality.Three companies propose Rule of judgment whether be pressure difference signal reliably of the difference of patent, Nissan think speed lower than predetermined threshold when It is unreliable to wait pressure difference, and Ford then thinks that engine pressure difference signal in transient working or smaller capacity is unreliable. Ten thousand state's engine intellectual property of the U.S. even defines the concept of restriction sensitivity to assess the reliability of pressure difference signal, to solve to press The decision problem of difference signal reliability.
Pressure difference signal reliability checking method disclosed in the solution of three companies has shortcoming.Firstly, day In the method for the detection pressure difference reliability that production company provides, speed threshold value only used to determine whether pressure difference signal is reliable, this The principle of method is that, when speed is lower, extraction flow is smaller, and which results in differential pressure pickups to work in the limit of detection range Above so that pressure difference signal precision deteriorates.The defect of the method is to lead firstly, it is only avoided when sensor is in measuring limit The unreliable problem of the pressure difference signal of cause is not avoided that since the unstable caused pressure difference signal of exhaust system is unreliable；Secondly, every Platform engine has specificity, it is too simple as judgement pressure difference signal dependability parameter that speed threshold value is used only, moreover start After machine operation deterioration, speed threshold value will be distorted, and former calibrating parameters may be not suitable for.Therefore, judged using the method The accuracy of pressure difference reliability is poor.The restriction sensitivity that ten thousand engine intellectual property Co., Ltds, state define is reliable to detect pressure difference Property method, it is even better compared with Nissan, although the method be only capable of detection extraction flow it is smaller caused by pressure difference signal can not It leans on, but since restriction sensitivity is that the change value of pressure that flows through particle filter exhaust by previous time and current time is real-time It is calculated, therefore, the method accuracy is high and even if engine longtime running generates deterioration, and the method can also synchronize adaptive It answers.But the defect of the method is, cannot detect due to the unreliable problem of the unstable caused pressure difference signal of exhaust system.Ford is public The patent proposed is taken charge of, the caused unreliable problem of pressure difference signal when sensor is in measuring limit had both been considered, it is contemplated that Due to the unreliable problem of the unstable caused pressure difference signal of exhaust system, but the method also has shortcoming, judgement exhaust Flow is smaller with the unstable method of extraction flow, is to work as actual value using the scalar quantities such as load and revolving speed progress threshold calibration When less than calibration threshold value, then it is assumed that engine is in transient state or low speed, and pressure differential method is forbidden to calculate carbon black load, and the method does not have yet There are the specificity and the deterioration problem after engine long-play for considering that every engine has, judges that pressure difference is insecure Precision and synchronous self-adapting are insufficient.
The patent that modern Kia company announces thinks, while carrying out carbon black calculating, needs micro- caused by removing ash content The influence of grain filter dischargeable capacity reduction only obtains carbon black estimator after eliminating ash content influence, is only particle mistake The true load of filter.This plays important supplementary function to the determination of particulate filter carbon black load.But the method It is disadvantageous in that, firstly, the variation of dischargeable capacity caused by ash content is a volume, and is calculating final carbon black estimator When, the variation of dischargeable capacity caused by ash content will be converted to, and the pressure difference as caused by ash content is converted to the quantity of the carbon black of equal load (kilogram)；Secondly, after the variation of dischargeable capacity caused by monitoring ash content occurs over just initiative regeneration, therefore, the calculating of the method Output is not successive value, is unable to pressure difference situation of change caused by real-time update ash content.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, a kind of engine particulate purifying regeneration control is provided System mainly solves the problems, such as the reliable detection of particulate filter carbon black (soot) load and effectively determines, micro- to obtain The opportunity of the grain suitable initiative regeneration of filter.
According to technical solution provided by the invention, the engine particulate purifying regeneration control system, it is characterized in that: including The differential pressure pickup of particulate filter pressure difference signal can be obtained and be set to particulate filter and oxidation catalyzer upstream and downstream Temperature sensor；
The output end connection pressure difference signal of the differential pressure pickup obtains module, and pressure difference signal obtains the output end point of module Not Lian Jie high-pass filter and pressure difference low-pass filtering module, the output end of high-pass filter connects noise energy mean value calculation mould Average noise energy intensity is calculated in block, noise energy mean value calculation module；The noise energy mean value calculation module Output end be separately connected low-pass filtering bandwidth and obtain module and pressure difference reliability decision module, low-pass filtering bandwidth obtains module Another input terminal connect carbon black model computation module, carbon black model computation module include carbon black model load increment value obtain mould To the conversion module of pressure difference, carbon black model load increment value, which obtains module and is used to obtain model, to be estimated to obtain for block and carbon black load Carbon black load increment, carbon black model load increment value obtain module output end connect carbon black load to pressure difference modulus of conversion Block, the conversion module of carbon black load to pressure difference calculate pressure difference variable quantity for obtaining model；The low-pass filtering bandwidth obtains Module calculates pressure difference variable quantity using average noise energy intensity and model, obtains low-pass filtering bandwidth width；The low pass filtered Wavestrip it is wide obtain module output end connect pressure difference low-pass filtering module, pressure difference low-pass filtering module using low-pass filtering bandwidth with Non-filtered pressure difference signal carries out low-pass filtering to pressure difference, obtains filtered pressure difference signal, pressure difference low-pass filtering module Output end connects pressure difference to the conversion module of carbon black loadings amount, and another input terminal of the conversion module of pressure difference to carbon black loadings amount connects The output end output pressure differential method of the equivalent carbon black load signal of ash point, the conversion module of pressure difference to carbon black loadings amount calculates acquisition Carbon black loadings；
Conversion module and output of the output end connection pressure difference of the pressure difference reliability decision module to carbon black loadings amount Carbon black model calculates enable signal to carbon black model load increment value and obtains module；When the pressure difference of pressure difference reliability decision module can Judge after passing through by property, the conversion module of pressure difference to carbon black loadings amount is negative using filtered pressure difference signal and the equivalent carbon black of ash content Lotus seeks calculating the carbon black loadings amount obtained according to pressure differential method, in this, as the judgment basis of initiative regeneration；When pressure difference reliability It is obstructed out-of-date that determination module pressure difference reliability judges, determines carbon black model load increment value, simultaneously using carbon black model computation module It is cumulative to obtain carbon black model calculated load.
Further, the equivalent carbon black load signal of the ash content by the equivalent carbon black Coordinated output module of ash content output The input terminal connection pressure differential method of end output, the equivalent carbon black Coordinated output module of ash content calculates the equivalent carbon black load mould of ash content Block.
Further, the formula of the average noise energy intensity are as follows:Its In, SnoiseFor average noise can intensity, this noise can intensity be based on certain time interval TfwAccumulated value and seek averagely obtaining ?.
Further, the low-pass filtering bandwidth obtains in module and calculates pressure difference using average noise energy intensity and model Changing value seeks low-pass filtering bandwidth width by looking into low-pass filtering bandwidth two-dimensional table.
Further, the pressure difference signal obtains the non-filtered pressure difference signal of module acquisition by pressure difference to carbon black loadings The conversion module of amount carries out pressure difference to the conversion of carbon black loadings amount, non-filtered carbon black loadings amount is obtained, then in conjunction with charcoal Black model load increment value obtains the carbon black load increment that module is estimated using model, looks into two-dimensional table to seek low pass filtered The wide degree of wavestrip.
Further, the judgment basis of the pressure difference reliability decision module includes: the noise energy intensity of pressure difference signal It is greater than threshold value less than threshold value, exhaust loads amount, speed is greater than threshold value, engine speed is greater than threshold value and fault-free mark is set Position.
Further, the pressure differential method calculates the carbon black loadings obtained and is obtained by following steps: firstly, obtain engine into Throughput and filtered pressure difference signal；Then by engine intake airflow and filtered pressure difference signal co-map two dimension charcoal Black load fundamental quantity table obtains carbon black loadings fundamental quantity；It is common by particulate filter internal temperature and filtered pressure difference signal Temperature correction coefficient can be obtained in mapping bivariate table；Temperature correction coefficient is multiplied with carbon black loadings fundamental quantity and passes through optimization low pass filtered After wave, the particulate filter load that acquisition does not remove ash content influence is obtained after subtracting the equivalent carbon black load of ash content according to pressure difference The carbon black loadings amount that method calculates.
Further, in the seeking of the equivalent carbon black load of the ash content, in non-renewable stage or pressure difference unreliable stage, The ash content load increment of grey sub-model estimation accumulation, the correction value of grey sub-model estimation, using what is sought according to pressure differential method Newest equivalent carbon black load；The modified ash content load increment of value is corrected multiplied by the pressure difference equivalency transform system of ash content to carbon black Number obtains equivalent carbon black load needed for generating same pressure differential；The equivalent carbon black load that above-mentioned grey sub-model is estimated Amount is corrected value and is modified, and obtains the equivalent carbon black load of ash content.
Further, in the seeking of the equivalent carbon black load of the ash content, when regeneration ending and reliable pressure difference, pressure differential method The carbon black loadings amount being calculated is the equivalent carbon black load of ash content.
Engine particulate purifying regeneration control system of the present invention can accurately the carbon black load to particulate filter carry out Monitoring effectively overcomes the problems, such as that differential pressure pickup reliability deficiency and ash content influence lead to carbon black carry calculation inaccuracy problem, It is accurate that the carbon black load for determining particulate filter regeneration opportunity is provided, it avoids generating high temperature when regeneration and extends the filter longevity Life；Engine oil dilution caused by avoiding transition from frequently regenerating, and then the abrasion of caused engine components aggravates and goes out The problem of existing failure.
The present invention can carbon black load to particulate filter carry out accurate estimation and monitoring, when determining suitable regeneration Machine.The method is calculated the load of carbon black using particulate filter pressure difference signal, that is, pressed when differential pressure pickup signal is reliable Poor method；When pressure difference signal is unreliable, using the value added for determining carbon black load based on the carbon black model of load and revolving speed, And carry out accumulation calculating, i.e. accumulative.It determines that the whether reliable method of pressure difference is, passes through high-pass filtering method and uses error (ISE) criterion is integrated to obtain the noise energy intensity of pressure difference signal, thinks that pressure difference is believed when pressure difference noise energy intensity is excessive It is number unreliable.And estimate that the pressure difference noise energy obtained may further be used to adjust pressure difference low-pass filtering bandwidth in real time, (when making an uproar When acoustic energy is big, filtering bandwidth is reduced；When noise energy is small, relax filtering bandwidth) to increase pressure difference signal precision after filtering. According to the requirement of pressure differential method, the pressure difference signal and delivery temperature and capacity obtained after filtering comes together to construct carbon black mould Type calculates and obtains particulate filter load total amount.Finally, invention also contemplates that ash content changes the shadow to carbon black load It rings, and discloses a kind of pressure difference caused by ash content is changed and be scaled the carbon black load for causing same equal-pressure-difference equivalent when changing Method, and when calculating carbon black load, removal particulate filter loads the equivalent carbon black load of ash content in total amount, to obtain Accurately with reliable carbon black load.
Detailed description of the invention
Fig. 1 is the diesel engine after treatment layout drawing equipped with particle supplementary set system.
Fig. 2 is the logic functional block total figure for obtaining carbon black loadings amount.
Fig. 3 is the logic function block diagram of pressure difference reliability decision.
Fig. 4 is the logic function block diagram that pressure difference is converted to carbon black loadings amount.
Fig. 5 is the logic function block diagram of the equivalent carbon black Coordinated output of ash content.
Fig. 6 is to be patrolled using pressure differential method what the equivalent carbon black load of ash content was sought when regeneration is completed and pressure difference signal is reliable Collect functional block diagram.
Figure label: diesel engine 1, combustion chamber 2, inlet manifold 3, fuel injector 4, gas pedal 5, exhaust manifold 6, EGR valve 7, throttle valve 8, pressure booster with variable cross section 9, oxidation catalyzer 10, particulate filter 11, the first temperature sensor 12, pressure difference sensing Device 13, second temperature sensor 14, third temperature sensor 15, electronic controller 16.
Specific embodiment
Below with reference to specific attached drawing, the invention will be further described.
As shown in Figure 1, being the diesel engine after treatment layout drawing equipped with particle supplementary set system, diesel engine 1 is in gas handling system In configured with throttle valve 8, pressure booster with variable cross section 9 and with cooler storage ring system, band cooler storage ring system EGR valve 7 is set in system, oxidation catalyzer 10 and particulate filter 11 are configured in exhaust gas aftertreatment system；Electronic controller 16 after the location information for acquiring gas pedal 5, according to driver request to calculate every cylinder introduce combustion chamber 2 air capacity and The oil mass of injection.Fresh air is pressurized by pressure booster with variable cross section 9, after throttle valve 8 with the portion that flows through EGR valve 7 Mixing introduces combustion chamber by inlet manifold 3.Fuel injector 4 receives the signal of electronic controller 16, will it is expected in suitable timing Oil mass spray into combustion chamber 2.After burning is completed, exhaust gas is by exhaust manifold 6, after pressure booster with variable cross section 9, urges in oxidation Under the catharsis for changing device 10 and particulate filter 11, so that the pernicious gas ingredient in tail gas meets the requirement of regulation, finally Arrange Xiang great Qi.
Emission control systems include catalyst system and particulate filter 11, optionally use the catalysis of multiple types Device (such as the selective catalytic reduction SCR catalyst based on urea, oxidation catalyzer DOC and/or NOxAdsorbent etc.) or can These catalyst are combined with particulate filter.Use arbitrary structures well known by persons skilled in the art (such as hydrocarbon nozzle Or the rear spray in direct-injection type of engine) to transmit reducing agent (such as hydrocarbon) to exhaust gas post-treatment device.The catalysis Device system may include oxidation catalyzer (DOC), for converting the hydrocarbon in engine (HC), carbon monoxide (CO) rapidly With nitric oxide (NO), oxidation catalyst includes noble metal catalyst, preferably containing the noble metal catalyst of platinum.Oxidation is urged Agent can also be used to provide heat in exhaust system, when additional fuel oil (HC) in oxidation catalyzer (DOC) oxidation heat liberation, It can produce the heat for meeting the regeneration requirements of particulate filter 11.Additional fuel supply can be by such as in the acting of engine Stroke and exhaust stroke carry out cylinder injection to realize, or using the timing of such as delayed injection, increase exhaust gas recycling EGR and into Moral stream, or increase all optional methods of HC emissions concentration to complete；Or it is directly realized using hydrocarbon (HC) nozzle also The dispensing of former agent.
The particulate filter 11 is in the present embodiment diesel particulate filter DPF, can link to catalyst system Downstream simultaneously is used to capture the particle matter (such as carbon black) generated in vehicle driving cycle.DPF can be manufactured by multiple material, including violet Green stone, silicon carbide and other high-temperature oxides ceramics.Once carbon black cumulant reaches predetermined level, initiative regeneration can be started.It is logical It crosses and particulate filter is heated to certain temperature to realize regeneration.(400-600 DEG C) can be to form than carbon black at such a temperature Faster speed burning carbon black pellet, in the present embodiment, DPF can be the particle mistake containing noble metal (such as platinum) coating Filter, this can reduce the ignition temperature of carbon black and by oxidizing hydrocarbon at carbon dioxide and water.
In addition, the first temperature sensor 12 is arranged in the downstream of the particulate filter 11, in oxidation catalyzer 10 and micro- Second temperature sensor 14 is set between grain filter 11, third temperature sensor 15 is set in the upstream of oxidation catalyzer 10, Or usable exhaust gas temperature model is based on operating condition estimation 11 temperature of particulate filter or delivery temperature.Pressure difference sensing can be passed through simultaneously The pressure difference signal of the acquisition particulate filter 11 of device 13.Alternatively, the upstream and downstream in particulate filter 11 installs two pressure sensors Also it can detecte pressure difference.The pressure drop of particulate filter 11 can be influenced by exhaust volumetric flow and DPF carbon black loadings, if needed It can also include but is not limited to the influence of the other factors such as temperature, fuel type if wanting.
Particle purifying regeneration control system of the present invention can determine suitable particulate filter initiative regeneration opportunity, complete The work that the carbon black load of particulate filter is reliably monitored.When differential pressure pickup is reliable, can be inputted according to pressure difference signal etc. Amount, accurate carbon black loadings amount is obtained using pressure differential method.When differential pressure pickup is unreliable, then determined using carbon black model The value added of carbon black load, and carry out accumulation calculating.
As shown in Fig. 2, to obtain the logic functional block total figure of carbon black loadings amount, including pressure difference signal obtains module 203, Pressure difference signal obtains module 203 and obtains non-filtered pressure difference signal from differential pressure pickup；The pressure difference signal obtains module 203 Output end be separately connected high-pass filter 204 and pressure difference low-pass filtering module 210, high-pass filter 204 to pressure difference signal into Row high-pass filtering is to obtain high-frequency noise；The output end of the high-pass filter 204 connects noise energy mean value calculation module 214, noise energy mean value calculation module 214 is for being calculated average noise energy intensity；The noise energy average value The output end of computing module 214 is separately connected low-pass filtering bandwidth and obtains module 208 and pressure difference reliability decision module 209, low Another input terminal that pass filtering bandwidth obtains module 208 connects carbon black model computation module 215, carbon black model computation module 215 The conversion module 202 of module 201 and carbon black load to pressure difference, carbon black model load are obtained including carbon black model load increment value Incremental value obtains module 201 and obtains mould for obtaining the carbon black load increment that model is estimated, carbon black model load increment value Conversion module 202 of the output end connection carbon black load of block 201 to pressure difference, the conversion module 202 of carbon black load to pressure difference Pressure difference variable quantity is calculated for obtaining model；The low-pass filtering bandwidth obtain module 208 using average noise energy intensity and Model calculates pressure difference variable quantity, looks into two-dimensional table and obtains low-pass filtering bandwidth width；The low-pass filtering bandwidth obtains module 208 Output end connect pressure difference low-pass filtering module 210, pressure difference low-pass filtering module 210 using low-pass filtering bandwidth with it is non-filtered Pressure difference signal to pressure difference carry out low-pass filtering, obtain filtered pressure difference signal, the output end of pressure difference low-pass filtering module 210 Connect conversion module 213 of the pressure difference to carbon black loadings amount, another input terminal company of the conversion module 213 of pressure difference to carbon black loadings amount The output end output pressure differential method calculating of the equivalent carbon black load signal of ash point, the conversion module 213 of pressure difference to carbon black loadings amount obtains Obtain carbon black loadings；The equivalent carbon black load signal of ash content by the equivalent carbon black Coordinated output module 212 of ash content output The input terminal connection pressure differential method of end output, the equivalent carbon black Coordinated output module 212 of ash content calculates the equivalent carbon black load of ash content Module 211.The output end of the pressure difference reliability decision module 209 connect pressure difference to carbon black loadings amount conversion module 213 with And output carbon black model calculates enable signal to carbon black model load increment value and obtains module 201.When pressure difference reliability decision mould After the pressure difference reliability judgement of block 209 passes through, the conversion module 213 of pressure difference to carbon black loadings amount uses filtered pressure difference signal With the equivalent carbon black load of ash content seek according to pressure differential method calculate obtain carbon black loadings amount, in this, as initiative regeneration judgement according to According to；When 209 pressure difference reliability of pressure difference reliability decision module judges obstructed out-of-date, illustrates that pressure difference signal is unreliable, can only use Carbon black model calculates carbon black loadings, obtains carbon black model load increment value using the estimation of carbon black model computation module 215 and adds up Obtain carbon black model calculated load (dotted line exports in Fig. 2).
During Regeneration control, non-filtered pressure difference signal is obtained from differential pressure pickup first, in high-pass filter 204 In high-pass filtering is carried out to it to obtain its high-frequency noise, since engine pressure difference actual signal is differed with the frequency band of noise signal It is larger, therefore the frequency range of its actual signal can be obtained in laboratory environment, to confirm high-pass filter bandwidth.Noise Average energy computing module 214 includes | u2| arithmetic unit 205, accumulator 206 and unit time average noise energy calculator 207, pass through | u2| arithmetic unit 205, accumulator 206 and unit time average noise energy calculator 207, use is improved ISE criterion, to calculate the average high frequency noise power value in the pressure difference signal unit time.Calculation formula is as follows:
Wherein, SnoiseAverage noise strength is represented, this noise intensity base In certain time interval TfwThe accumulated value of (can demarcate) simultaneously seeks average acquisition, represents the noise energy intensity in the unit time.Through The average noise energy intensity that noise energy mean value calculation module 214 is calculated, there are two effects, and first is enter into pressure Poor reliability decision module 209, to judge pressure difference signal, whether noise energy is excessive, so that pressure differential method calculating is unreliable；Second, It is to be obtained in module 208 in low-pass filtering bandwidth as one of input and seek adaptive low-pass filtering bandwidth, to obtain one It is a both undistorted, noise jamming and few pressure difference signal.Another input that low-pass filtering bandwidth obtains in module 208 is carbon black The model that model computation module 215 is calculated calculates pressure difference variable quantity, can obtain module by carbon black model load increment value 201 and the conversion module 202 of carbon black load to pressure difference seek, wherein being obtained in module 201 in carbon black model load increment value The carbon black load increment estimated using model is obtained, and the conversion module 202 by carbon black load to pressure difference completes charcoal Black load finally obtains mould to the conversion (this step be pressure difference the inverse function of the conversion module 213 of carbon black loadings amount) of pressure difference Type calculates pressure difference variable quantity.Low-pass filtering bandwidth obtains in module 208 and calculates pressure difference using average noise energy intensity and model Changing value looks into two-dimensional table to seek low-pass filtering bandwidth width, so that under the premise of not destroying pressure difference signal variation tendency (calculating reference of the pressure difference changing value as true pressure difference signal by model) filters out high-frequency noise (by the average sound of height as far as possible Reference of the energy intensity as noise intensity).Low-pass filtering bandwidth two-dimensional table can demarcate completion in the lab, and calibration is quasi- Then are as follows: when noise energy is big or carbon black load incrementss are small, filtering bandwidth reduces, when noise energy is small or carbon black load increases When measuring big, filtering bandwidth relaxes.It can also be first by non-filtered pressure difference signal by pressure difference to the conversion module of carbon black loadings amount 213 carry out pressure difference to the conversion of carbon black loadings amount, non-filtered carbon black loadings amount are obtained, then in conjunction with carbon black model load Incremental value obtains the carbon black load increment that module 201 is estimated using model, looks into two-dimensional table to seek low-pass filtering bandwidth Width.This two methods can reach same purpose.It is obtained in module 210 in carbon black model load increment value, uses low pass Filtering bandwidth and non-filtered pressure difference signal carry out low-pass filtering to pressure difference, can get filtered pressure difference signal, work as pressure difference After the judgement of 209 pressure difference reliability of reliability decision module passes through, it can be used filtered pressure difference signal and the equivalent carbon black of ash content negative Lotus is sought calculating the carbon black loadings amount obtained according to pressure differential method with the conversion module 213 of pressure difference to carbon black loadings amount, in this, as The judgment basis of initiative regeneration.When 209 pressure difference reliability of pressure difference reliability decision module judges obstructed out-of-date, illustrate pressure difference signal It is unreliable, carbon black model can only be used to calculate carbon black loadings, process is transferred to carbon black model load increment value and obtains module 201, makes Estimated to obtain carbon black load increment and the cumulative load (dotted line output) for obtaining carbon black model and calculating with model.
As shown in figure 3, being the logic function block diagram of pressure difference reliability decision module 209.Determined according to following steps: The noise energy intensity of S304 pressure difference signal is less than threshold value, S303 exhaust loads amount is greater than threshold value, S302 speed is greater than threshold value, S301 engine speed is greater than threshold value and S305 fault-free flag set, then step S306 use and logic, could activate pressure Poor method calculates carbon black loadings enabler flags.
As shown in figure 4, the logic function block diagram of the conversion module 213 for pressure difference to carbon black loadings amount.Firstly, through step S401 obtains engine intake airflow, the filtered pressure difference signal obtained through step S404；Then through step S402, by starting Machine charge flow rate and filtered pressure difference signal co-map two dimension carbon black loadings fundamental quantity table obtain carbon black loadings fundamental quantity； Step S405 obtains DPF internal temperature, through step S407 by DPF internal temperature and filtered pressure difference signal co-map two dimension Table can be obtained temperature correction coefficient, temperature correction coefficient be multiplied with carbon black loadings fundamental quantity and pass through step S403 optimize it is low After pass filter, the particulate filter load for not removing ash content influence can get, subtract the equivalent carbon black of ash content of step S406 acquisition After load, the carbon black loadings amount calculated according to pressure differential method can be obtained.
As shown in figure 5, being the logic function block diagram of the equivalent carbon black Coordinated output module 212 of ash content.Non-renewable state Under, the ash content load increment of grey sub-model estimation accumulation can be used, and obtain multiplied by the pressure difference equivalent conversion coefficient of ash content to carbon black Take final equivalent carbon black load.Specifically includes the following steps:
S501: fuel consumption is obtained；
S502: fuel consumption threshold value C is obtainedAsh；The confirmation formula of this threshold value is as follows:
Wherein, CAshIt is consumed by the certain ash accumulation amount of the increase determined in the lab according to ash content production principle Amount of fuel；ZOil/FuelFor the efficiency for the consumption of lubricating oil that fuel consumption amount will lead to, this consumption efficiency is according to the different small of operating condition Width changes；ZAsh/OilFor the efficiency that the ash content that will lead to of burning oil level generates, this generation efficiency is according to the difference of machine oil brand Variation；ηstThe efficiency of ash content is captured for particulate filter, this arresting efficiency is according to particulate filter degree of aging and EGR rate etc. Parameter slightly changes.By formula it is found that ash content occurs mainly in the burning of machine oil, and generates and fired consumed by a certain amount of ash content Oil consumption can be determined by three above efficiency.After engine configuration determines, CAshIt determines therewith；
S503: using the cumulative fuel consumption of fuel consumption accumulator, when fuel consumption accumulated value is greater than CAshFuel oil disappears When consuming threshold value, illustrate to produce a certain amount of ash content, therefore add up to ash content using ash content accumulator in S504, obtain Ash content basic value (when replacing or cleaning DPF, needs to be purged ash content basic value)；
Then through step S505: according to revolving speed, load, delivery temperature, particulate filter degree of aging, machine oil brand and The parameters such as EGR rate seek ash content estimation correction factor to be modified to ash content basic value, obtain final ash content accumulated value；
Final ash content accumulated value obtains by the conversion of the pressure difference equivalent conversion coefficient of ash content to carbon black and generates identical pressure The required equivalent carbon black load of difference；
Most afterwards through step S506: the equivalent carbon black load that above-mentioned grey sub-model is estimated being corrected value and is repaired Just, the equivalent carbon black load of ash content is obtained；The correction value works as regeneration ending and pressure difference letter using what step S507 was obtained The newest equivalent carbon black load that pressure differential method calculates when number reliable, guarantees that model calculates the accuracy of correction value with this.
The pressure difference equivalent conversion coefficient of ash content to carbon black is obtained by following principle inference: according to Darcy's law (Darcys Law), particulate filter pressure difference is represented by following formula:
Wherein, μ indicates viscosity coefficient, QexhFor capacity, k indicates wall transmissivity, and w indicates wall thickness, DhIndicate that flowing is straight Diameter, x indicate the effective length in the channel DPF, and A indicates particulate filter effective sectional area；It wherein can be by formula A=4DhX is indicated；a What is indicated is filter coefficient, can be by formulaIt obtains.
When possessing ash content and carbon black in particulate filter, this two kinds of substances can be had an impact filter differential pressure, because Pressure drop in this filter can consist of three parts: Δ P=Δ PCarbon black+ΔPAsh content+ΔP0, wherein Δ P0Refer to and works as particulate filter For the fixed pressure drop generated when cleaning, Δ PCarbon blackFor the DPF pressure drop as caused by carbon black, and Δ PAsh contentIt is pressed for the DPF as caused by ash content Drop.Due to the nature difference of ash content and carbon black, the parameters such as wall transmissivity difference is resulted in, finally makes its filter coefficient not Together, therefore, the pressure drop in filter is finally represented by Δ P=(aCarbon black+aAsh content)*μ*Qexh+ΔP0, can be derived from this formula The pressure difference equivalent conversion coefficient for obtaining ash content to carbon black is aCarbon black/aAsh content, the pressure difference equivalent conversion coefficient of ash content to carbon black is one Constant can be obtained after engine configuration determines by Laboratory Calibration.Use the pressure difference equivalency transform system of ash content to carbon black Number, it is convenient to ash content load transfer be equivalent carbon black loadings；Finally when calculating carbon black loadings, this equivalence value can be used Remove influence of the ash content to particulate filter pressure difference.
As shown in fig. 6, to be carried out using pressure differential method to the equivalent carbon black load of ash content when regeneration completion and reliable pressure difference signal The logic function block diagram sought.When the noise energy intensity for meeting S604 pressure difference signal is less than threshold value, S603 extraction flow is greater than When threshold value, S602 speed are greater than threshold value and S605 fault-free flag set, illustrate differential pressure pickup reliable operation, at this point, such as Fruit is S601 regeneration completion status, then the only ash content present in the particulate filter, ECU is according to pressure difference signal through step S606 is the equivalent carbon black load of ash content using the carbon black loadings amount that pressure differential method is calculated.It is equivalent that ash content is calculated relative to model For carbon black load, the carbon black load obtained using differential pressure pickup measurement is more accurate, therefore, through step S607 using tired The equivalent carbon black load of average ash after adding device to seek regeneration ending in a period of time, using (regeneration is completed as step S506 To ash content accumulator correction module) input, to model calculate the equivalent carbon black load of ash content be modified, guarantee model calculate Accuracy.
Particle purifying regeneration control system of the present invention is when differential pressure pickup signal is reliable, using particulate filter Pressure difference signal calculates the load of carbon black, i.e. pressure differential method；When pressure difference signal is unreliable, using the charcoal based on load and revolving speed Black model determines the value added of carbon black load, and carries out accumulation calculating, i.e. accumulative.
Determining the whether reliable method of pressure difference is, obtains by high-pass filtering and using error intergal (ISE) criterion to calculate The noise energy intensity of pressure difference signal thinks that pressure difference signal is unreliable when pressure difference noise energy intensity is excessive.The method Working principle is, when hydrodynamic characteristic is unstable or when extraction flow is smaller in exhaust system, making an uproar in pressure difference signal Acoustic jamming signal necessarily enhances relative to the intensity of true pressure difference signal, and the energy by noise signal in detection pressure difference signal is strong Degree, whether can judging pressure difference signal reliably in real time and accurately, is compared with the traditional method, the use of the method can meet The accuracy requirement of pressure difference reliability detection and adaptivity requirement.
Even if when pressure difference is reliable, the noise energy that is calculated, it can also be used in pressure difference signal low-pass filtering, for example, According to pressure difference signal noise and the carbon black load value added determined based on the carbon black model of load and revolving speed, two dimension can be mapped Table simultaneously obtains pressure difference signal low-pass filtering bandwidth, and the overall principle of mapping is, when noise energy is big, filtering bandwidth reduces, Noise energy hour, filtering bandwidth relax；When carbon black model cumulant value added is big, filtering bandwidth relaxes, the accumulation of carbon black model Value added hour filtering bandwidth is measured to reduce.
According to the requirement of pressure differential method, the pressure difference signal obtained after filtering will come together with delivery temperature and capacity Carbon black model is constructed, calculate and obtains particulate filter load total amount.Finally, invention also contemplates that ash content variation is negative to carbon black The influence of lotus amount, and disclose a kind of carbon black that pressure difference caused by ash content is changed and is scaled and causes same equal-pressure-difference equivalent when changing The method of load, and the equivalent carbon black load of ash content when calculating carbon black load, in removal particulate filter load total amount Amount, with obtain accurately with reliable carbon black load.
The implementation of the equivalent carbon black load method of this ash content are as follows: 1) after regeneration ending, and meeting differential pressure pickup can (reliable measurements condition includes but is not limited to that speed is higher than certain threshold value or extraction flow greater than certain threshold value when by the condition of measurement Or differential pressure pickup noise energy intensity is less than certain threshold value), the mean value of pressure difference in a period of time is recorded, is separated in this, as ash The particulate filter pressure difference variable quantity risen；The mean value for the carbon black load output that record causes pressure difference to be sought according to ash content, as Ash content causes pressure difference to be scaled carbon black load equivalent when causing same pressure differential.2) under other operating conditions, estimated using grey sub-model The ash content load increment of accumulation is calculated, and obtains final equivalent carbon black multiplied by the pressure difference equivalent conversion coefficient of ash content to carbon black and bears Lotus amount.The correction value of grey sub-model estimation, after regeneration ending, and the equivalent carbon black that when pressure difference signal is reliable seeks Load guarantees that model calculates the accuracy of correction value with this.The cumulative basic value of ash content of grey sub-model estimation, may be used oil Consumption cumulant obtains, and according to revolving speed, load, delivery temperature, particulate filter degree of aging, machine oil brand and EGR rate Etc. parameters seek correction factor to be modified to basic value, the final ash content that obtains increases final value.
The present invention is based on the noise intensities of real-time monitoring, its working principle is that, when hydrodynamic characteristic is not in exhaust system When stable or extraction flow is smaller, the noise interferences in pressure difference signal are inevitable relative to the intensity of true pressure difference signal Enhancing can judge that pressure difference is believed by detecting and calculating the energy intensity of noise signal in pressure difference signal in real time and accurately Whether number reliable, the use of the method meets accuracy requirement and the adaptivity requirement of the detection of pressure difference reliability.Even if When pressure difference is reliable, the noise energy that is calculated, it can also be used in pressure difference signal low-pass filtering, for example, being made an uproar according to pressure difference signal Sound and the carbon black load value added determined based on the carbon black model of load and revolving speed, can map bivariate table and obtain pressure difference letter The overall principle of number low-pass filtering bandwidth, mapping is, when noise energy is big, filtering bandwidth reduces, noise energy hour, filter Wavestrip width relaxes；When carbon black model cumulant value added is big, filtering bandwidth relaxes, the filter of carbon black model cumulant value added hour The wide diminution of wavestrip.

Claims (9)

1. a kind of engine particulate purifying regeneration control system, it is characterized in that: including that can obtain particulate filter (11) pressure difference The differential pressure pickup (13) of signal and the temperature sensing for being set to particulate filter (11) and oxidation catalyzer (10) upstream and downstream Device；
The output end connection pressure difference signal of the differential pressure pickup (13) obtains module (203), and pressure difference signal obtains module (203) Output end be separately connected high-pass filter (204) and pressure difference low-pass filtering module (210), the output of high-pass filter (204) Average noise is calculated in end connection noise energy mean value calculation module (214), noise energy mean value calculation module (214) Energy intensity；The output end of the noise energy mean value calculation module (214) is separately connected low-pass filtering bandwidth and obtains module (208) and pressure difference reliability decision module (209), another input terminal that low-pass filtering bandwidth obtains module (208) connect carbon black Model computation module (215), carbon black model computation module (215) include carbon black model load increment value obtain module (201) and To the conversion module (202) of pressure difference, carbon black model load increment value obtains module (201) and is used to obtain model to be estimated carbon black load Obtained carbon black load increment is counted, the output end connection carbon black load that carbon black model load increment value obtains module (201) arrives The conversion module (202) of pressure difference, the conversion module (202) of carbon black load to pressure difference calculate pressure difference variation for obtaining model Amount；The low-pass filtering bandwidth obtains module (208) and calculates pressure difference variable quantity using average noise energy intensity and model, obtains Low-pass filtering bandwidth width；The output end that the low-pass filtering bandwidth obtains module (208) connects pressure difference low-pass filtering module (210), pressure difference low-pass filtering module (210) carries out low pass to pressure difference using low-pass filtering bandwidth and non-filtered pressure difference signal Filtering, obtains filtered pressure difference signal, and the output end of pressure difference low-pass filtering module (210) connects pressure difference to carbon black loadings amount Another input terminal of conversion module (213), the conversion module (213) of pressure difference to carbon black loadings amount connects the equivalent carbon black load of ash content The output end output pressure differential method of signal, the conversion module (213) of pressure difference to carbon black loadings amount calculates the carbon black loadings obtained；
The output end of the pressure difference reliability decision module (209) connect pressure difference to carbon black loadings amount conversion module (213) with And output carbon black model calculates enable signal to carbon black model load increment value and obtains module (201)；When pressure difference reliability decision After the pressure difference reliability judgement of module (209) passes through, the conversion module (213) of pressure difference to carbon black loadings amount uses filtered pressure Difference signal and the equivalent carbon black load of ash content are sought calculating the carbon black loadings amount obtained according to pressure differential method, in this, as initiative regeneration Judgment basis；When the pressure difference reliability of pressure difference reliability decision module (209) judge it is obstructed out-of-date, using carbon black model calculate mould Block (215) determines carbon black model load increment value and cumulative acquisition carbon black model calculated load.
2. engine particulate purifying regeneration control system as described in claim 1, it is characterized in that: the equivalent carbon black of the ash content is negative Lotus signal is exported by the output end of the equivalent carbon black Coordinated output module (212) of ash content, and the equivalent carbon black Coordinated of ash content is defeated The input terminal connection pressure differential method of module (212) calculates the equivalent carbon black loading module (211) of ash content out.
3. engine particulate purifying regeneration control system as described in claim 1, it is characterized in that: the average noise energy is strong The formula of degree are as follows:Wherein, SnoiseFor average noise energy intensity, this noise energy Intensity is based on certain time interval TfwAccumulated value and seek average acquisition, e (τ) indicates that pressure difference signal is obtained after high-pass filter The HF noise signal obtained.
4. engine particulate purifying regeneration control system as described in claim 1, it is characterized in that: the low-pass filtering bandwidth obtains Pressure difference changing value is calculated using average noise energy intensity and model in modulus block (208), by looking into low-pass filtering bandwidth two dimension Table seeks low-pass filtering bandwidth width.
5. engine particulate purifying regeneration control system as described in claim 1, it is characterized in that: the pressure difference signal obtains mould The non-filtered pressure difference signal that block (203) obtains carries out pressure difference to charcoal by the conversion module (213) of pressure difference to carbon black loadings amount The conversion of black load capacity obtains non-filtered carbon black loadings amount, then obtains module in conjunction with carbon black model load increment value (201) the carbon black load increment estimated using model looks into two-dimensional table to seek low-pass filtering bandwidth width.
6. engine particulate purifying regeneration control system as described in claim 1, it is characterized in that: the pressure difference reliability decision The judgment basis of module (209) includes: that the noise energy intensity of pressure difference signal is less than threshold value, exhaust loads amount is greater than threshold value, vehicle Speed is greater than threshold value, engine speed is greater than threshold value and fault-free flag set.
7. engine particulate purifying regeneration control system as described in claim 1 obtains it is characterized in that: the pressure differential method calculates Carbon black loadings obtained by following steps: firstly, obtaining engine intake airflow and filtered pressure difference signal；Then by starting Machine charge flow rate and filtered pressure difference signal co-map two dimension carbon black loadings fundamental quantity table obtain carbon black loadings fundamental quantity； Temperature correction coefficient can be obtained by particulate filter internal temperature and filtered pressure difference signal co-map bivariate table；Temperature is repaired Positive coefficient is multiplied with carbon black loadings fundamental quantity and after optimizing low-pass filtering, obtains the particulate filter for not removing ash content influence Load after subtracting the equivalent carbon black load of ash content, obtains the carbon black loadings amount calculated according to pressure differential method.
8. engine particulate purifying regeneration control system as claimed in claim 2, it is characterized in that: the equivalent carbon black of the ash content is negative In the seeking of lotus amount, in non-renewable stage or pressure difference unreliable stage, the ash content load increment of grey sub-model estimation accumulation, ash content The correction value of model estimation, using the newest equivalent carbon black load sought according to pressure differential method；It is modified to be corrected value It is negative to obtain equivalent carbon black needed for generating same pressure differential multiplied by the pressure difference equivalent conversion coefficient of ash content to carbon black for ash content load increment Lotus amount；The equivalent carbon black load that above-mentioned grey sub-model is estimated is corrected value to be modified, obtains the equivalent carbon black of ash content Load.
9. engine particulate purifying regeneration control system as described in claim 1, it is characterized in that: the equivalent carbon black of the ash content is negative In the seeking of lotus amount, when regeneration ending and reliable pressure difference, the carbon black loadings amount that pressure differential method is calculated is not remove ash content The particulate filter load of influence.
CN201710062818.XA 2017-01-25 2017-01-25 Engine particulate purifying regeneration control system Active CN106837496B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710062818.XA CN106837496B (en) 2017-01-25 2017-01-25 Engine particulate purifying regeneration control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710062818.XA CN106837496B (en) 2017-01-25 2017-01-25 Engine particulate purifying regeneration control system

Publications (2)

Publication Number Publication Date
CN106837496A CN106837496A (en) 2017-06-13
CN106837496B true CN106837496B (en) 2019-07-16

Family

ID=59122765

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710062818.XA Active CN106837496B (en) 2017-01-25 2017-01-25 Engine particulate purifying regeneration control system

Country Status (1)

Country Link
CN (1) CN106837496B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017222313A1 (en) * 2017-12-08 2019-06-13 Robert Bosch Gmbh Method and device for diagnosing a differential pressure sensor of a particulate filter
DE102018207227B4 (en) * 2018-05-09 2021-10-07 Bayerische Motoren Werke Aktiengesellschaft Determining an ash load in a particulate filter for an internal combustion engine
CN110714822B (en) * 2019-11-21 2020-09-29 潍柴动力股份有限公司 Control method and control system for DPF regeneration
CN110671177B (en) * 2019-12-04 2020-03-17 潍柴动力股份有限公司 DPF regeneration method and device
CN110941917A (en) * 2019-12-17 2020-03-31 凯龙高科技股份有限公司 Diesel engine DPF carbon loading capacity calculation method based on pressure drop
CN112648057B (en) * 2020-12-22 2022-04-05 潍柴动力股份有限公司 Carbon load detection method of particulate matter catcher, related equipment and storage medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1734067A (en) * 2004-08-10 2006-02-15 日产自动车株式会社 The reckoning of particulate matter deposit amount in the diesel soot filter
CN101458108A (en) * 2007-12-14 2009-06-17 现代自动车株式会社 Method and apparatus for calculating effective volume of diesel particulate filter
CN101598058A (en) * 2007-12-18 2009-12-09 福特环球技术公司 Diesel particulate filter load determines under transient state and the stable state state of cyclic operation
CN103975150A (en) * 2011-12-12 2014-08-06 罗伯特·博世有限公司 Method and device for the dynamic monitoring of gas sensors
CN104061051A (en) * 2014-06-30 2014-09-24 长城汽车股份有限公司 Regeneration opportunity control method for DPF (Diesel Particulate Filter) of diesel engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6085214A (en) * 1983-10-13 1985-05-14 Mitsubishi Electric Corp Internal-combustion engine filter regenerating device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1734067A (en) * 2004-08-10 2006-02-15 日产自动车株式会社 The reckoning of particulate matter deposit amount in the diesel soot filter
CN101458108A (en) * 2007-12-14 2009-06-17 现代自动车株式会社 Method and apparatus for calculating effective volume of diesel particulate filter
CN101598058A (en) * 2007-12-18 2009-12-09 福特环球技术公司 Diesel particulate filter load determines under transient state and the stable state state of cyclic operation
CN103975150A (en) * 2011-12-12 2014-08-06 罗伯特·博世有限公司 Method and device for the dynamic monitoring of gas sensors
CN104061051A (en) * 2014-06-30 2014-09-24 长城汽车股份有限公司 Regeneration opportunity control method for DPF (Diesel Particulate Filter) of diesel engine

Also Published As

Publication number Publication date
CN106837496A (en) 2017-06-13

Similar Documents

Publication Publication Date Title
CN106837496B (en) Engine particulate purifying regeneration control system
CN108150260B (en) Method and system for calculating carbon loading of diesel engine DPF
US7758676B2 (en) Adaptive learning method for clean particulate filter pressure drop
JP4430704B2 (en) Exhaust gas purification device for internal combustion engine
CN110671177B (en) DPF regeneration method and device
US20040172933A1 (en) Internal combustion engine exhaust gas purification system
JP4103719B2 (en) ENGINE EXHAUST PURIFICATION APPARATUS AND METHOD FOR DETERMINING PARTICLE DEPOSITION STATE OF PARTICLE COLLECTION FILTER
JP2004340138A (en) System and method for pressure sensor diagnosis by computer
WO2010133276A1 (en) Method for calculating an efficiency index of a diesel oxidation catalyst
JP2008031854A (en) Exhaust emission control device for internal combustion engine
JP2005048740A (en) Exhaust emission control device for engine, and particulate accumulation state determination method for particulate collection filter
JP5337069B2 (en) Engine exhaust pressure loss calculation device
EP2128393A1 (en) Exhaust gas post-processing apparatus and regeneration method thereof
US8387364B2 (en) Exhaust gas purifying apparatus for internal combustion engine
CA3125381A1 (en) Methods for diagnostics and operation of an emissions aftertreatment system
GB2456060A (en) Filter regeneration
JP4697463B2 (en) Engine oil dilution state estimation device
JP4956780B2 (en) Particulate combustion amount detection device and detection method for exhaust gas purification filter, and particulate accumulation amount detection device
JP2004225616A (en) Exhaust emission control device for internal combustion engine
CN114635775A (en) DOC performance detection method and system for diesel engine
CN105298605B (en) Method for controlling oxygen concentration
CN110714822B (en) Control method and control system for DPF regeneration
JP4744529B2 (en) Device for estimating the amount of particulates present in automobile particulate filters
JP2006046245A (en) Device for monitoring dilution condition of engine oil
US10392998B2 (en) Combining model and delta pressure based soot load estimates

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant