CN101571067A - Method and apparatus for controlling operation of exhaust gas post-treatment device - Google Patents
Method and apparatus for controlling operation of exhaust gas post-treatment device Download PDFInfo
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- CN101571067A CN101571067A CNA2009101332395A CN200910133239A CN101571067A CN 101571067 A CN101571067 A CN 101571067A CN A2009101332395 A CNA2009101332395 A CN A2009101332395A CN 200910133239 A CN200910133239 A CN 200910133239A CN 101571067 A CN101571067 A CN 101571067A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0418—Methods of control or diagnosing using integration or an accumulated value within an elapsed period
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0812—Particle filter loading
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention relates to a method for controlling operation of exhaust gas post-treatment device, wherein the soot charging of the exhaust gas post-treatment device is estimated integrating soot charging rate in the charging stage and soot converting rate in the regeneration stage in the exhaust gas post-treatment device, and decision for initiation and/or end of the regeneration treatment is made as a function of the estimation result. The invention allows for better adaptation to the actual loading state of the exhaust gas post-treatment device to execute the regeneration treatment.
Description
Technical field
[0001] the present invention relates to a kind of method and apparatus that is used to control operations of exhaust gas post-processing device.
Background technique
[0002] the present invention can usually be applied in the motor vehicle that are equipped with explosive motor and exhaust gas post-treatment device.Exhaust gas post-treatment device is used to handle the blast air that is caused by the aerial burning of fuel, and described burning is internally at cylinder internal or externally in blast air.In this article, described blast air can be repeatedly and particularly periodic mode be placed in the heat levels of rising.This regeneration period at for example diesel particulate filter (DPF) is finished, or the operational phase with enriched air/fuel mixture under the situation of lean nitrogen oxide catcher finishes.
[0003] in the prior art, be known that by using the amount of the soot of storing in following two parallel routes estimation diesel particulate filter:
[0004] in article one estimated path, based on the indicatrix of the amount (being described as mass concentration mg/g or mass velocity g/h) of the measurement of one group of soot (soot) discharging, the soot model that gives off and be fed to the exhaust of exhaust gas post-treatment device from explosive motor is used for calculating the soot filling rate (below be called " open loop control " or " based on the estimation of model ") of diesel particulate filter.The chemomotive force model is used for based on oxygen (O
2, initiative regeneration) and nitrogen dioxide (NO
2, passive regeneration) and estimation soot conversion ratio.Be used to estimate the quality of the soot stored after the mass balance.Consider to be used to after the heat model of energy conservation from gas subsequently clean enthalpy (enthalpy) supply, thermal losses on every side and because the filter-carrier model is estimated in the heat dissipation that the oxidation reaction of heat release causes, the oxidation reaction of described heat release is by carbon-smoke combustion or for example carbon monoxide (CO), hydrocarbon (THC) or nitrous oxide materials such as (NO) and cause.
[0005] in the second estimated path, at first, the differential pressure of measuring at the diesel particulate filter two ends is corrected (below be called " closed loop control " or " based on the estimation of differential pressure ") by the friction pressure loss in the gas of the diesel particulate filter of flowing through.The volume flow working pressure value and the temperature value at diesel particulate filter two ends calculate, and described force value and temperature value be measured or estimation at upstream position.Ash in the diesel particulate filter (ash) content estimated, this estimation is carried out or execution (to guarantee not having soot to be stored) the closed loop control of the derivation of measuring by the differential pressure after the regeneration event that enlarges in by the open loop control in conjunction with the precomputation speed of clean grey memory space.Finally, the amount of soot is calculated as the function of the ash amount of differential pressure, volume flow and estimation after the correction.
[0006] during decision triggers or stops purified treatment, soot loading of estimating in open loop control and the soot of estimating in closed loop control load and are used usually, the maximum value of two signals is that the minimum value that is used to trigger cleansing phase and two signals is used to stop cleansing phase, as long as two estimation scheme are calibrated by rights.When following steps are carried out in the expansion regeneration back of the success of diesel particulate filter, in proper range, carry out with the adaptation that the soot of estimating based on the mode of model loads:
(1) since in the net content of the soot stored in conjunction with error, the estimation of the amount of soot in the open loop control is reduced to zero in itself so that minimize skew (drift) in the estimation that is obtained, described skew since the inaccuracy in the estimation of skew in the discharging of the soot of explosive motor or soot conversion produce.
(2) be used in after the described estimation in the closed loop control so that the ash amount that obtains to be stored, thereby guarantee that the ash amount of being stored is accurately estimated.
[0007] yet, in such scheme, the problem that is occurred is that the estimation of the estimation of the amount of soot carried out by open loop control and the amount of soot carried out by closed loop control can not adapt to continuously.This mainly is because the indefinite fact of coherence between the storage quality of soot and the measured on the other hand differential pressure on the one hand, and indefinite reason has a plurality of: on the one hand, passive regeneration is because nitrogen dioxide (NO
2) with 200-400 ℃ temperature window in soot reaction and cause the low-pressure loss of identical soot memory space.In addition, the soot under the high volume flow redistributes the change that causes based on the differential pressure on the volume flow of the predefined amount of the soot of being stored.Regeneration Treatment under the low-down mass flow rate causes the quick decline corresponding to the pressure of the regeneration of the soot of filter center, but during near the soot filter wall regeneration low-level causes load phase the fast lifting of pressure signal.At last, further reason is the low spatial homogeneous of temperature distribution, particularly in the regeneration stage under having excessively big soot loading environment.
[0008] according to prior art, the error in the estimation of the bed temperature of diesel particulate filter also because of following former thereby occur in the regeneration stage during: on the one hand, the original soot when the beginning of Regeneration Treatment loads and can be over-evaluated or underestimate.On the other hand, during the regeneration stage, because model must predict the regeneration amount of soot and consider the axis temperature and the typical volume temperature distribution of radial temperature, the use of low bit model (low order) can cause compromise during the calibration phase of this model.
Summary of the invention
[0009] based on above background, the purpose of this invention is to provide a kind of available method and apparatus with the control operations of exhaust gas post-processing device, this method and apparatus allows to carry out Regeneration Treatment with the better adaptation to the actual loaded state of exhaust gas post-treatment device.
[0010] this purpose is by realizing according to the method for independent claims 1 described feature with according to the device of independent claims 10 described features.
[0011] in the method that is used for controlling operations of exhaust gas post-processing device according to the present invention, the soot of exhaust gas post-treatment device loads by estimating in conjunction with the soot conversion rate in the exhaust gas post-treatment device in conjunction with the soot loading speed of exhaust gas post-treatment device with in the regeneration stage in load phase, and to the decision of the beginning of Regeneration Treatment and/or termination as the function of results estimated and make, in order to estimate that soot loads, be determined by exhaust gas post-treatment device or at least one differential pressure of measuring by the assembly of exhaust gas post-treatment device.In order to determine soot loading speed and/or soot conversion rate, the estimation based on model of soot loading speed and/or soot conversion rate is independent of measured differential pressure and carries out, and wherein loads with the soot that forms based on model based on the soot loading speed of model with based on the soot conversion rate of model is combined.In addition, the estimation based on differential pressure that comprises the soot loading of measured differential pressure is at least carried out at least provisionally.The estimation based on model that soot loads is compared with the estimation based on differential pressure that soot loads, and if reach predefined condition, being corrected based on the estimation of differential pressure based on the estimated service life soot loading of model that load of soot then.
[0012] according to the present invention, a kind of scheme of continuous correction of the storage quality based on soot is preferably proposed, the storage quality of this soot obtains by the estimation in the closed loop control in the correcting range restriction of expection.This initial storage quality of having guaranteed soot is estimated with optimum way that by the fact of the restriction of the correcting range of institute's foundation the restricted passage of described correcting range is used so-called " acclimatization to cold " and carried out, i.e. low-temperature adaptation during the load phase.Owing to, therefore avoided the random fluctuation of soot loading when not proofreading and correct generation when the value of model is in correcting range.Yet, can also carry out correction based on the difference between model and the differential pressure measurement all the time.Consider actual soot changing relatively fast in loading especially according to the solution of the present invention, this change may in based on the mode of model, detect less than but can use the differential pressure value and directly considered.
[0013] in addition, adaptation scheme preferably uses during the regeneration stage and adapts to (being called " acclimation to heat ", i.e. adaptation under regeneration stage high temperature) to guarantee the soot conversion rate to use feedback control.
[0014] in strategy according to the present invention, preferred following adaptation project or the factor of calculating:
I. a soot loading adaptation PFlt_mfSotAdap (g/s) of open loop control calculates during load phase, the threshold value of calculating before wherein if filter temperature is lower than (" acclimatization to cold "), then the soot during these definite load phase loads the speed that adapts to.Consider after these in the equation of soot mass balance and combined amount of soot with definite whole storage.
II. in addition, activation energy adaptation factor PFlt_rSotCmbAdap calculates at regeneration period.This factor forms the multiplication correction term of activation energy, and described activation energy is used for the estimation of carbon-smoke combustion speed.(" acclimation to heat ") only just takes place in this adaptation when the filter temperature is higher than the threshold value of calculating before.
[0015] method that loads of a kind of soot that is used for estimating diesel particulate filter is illustrated at the applicant's disclosed European patent application EP 1854971A1, and wherein the eigenvalue that loads of soot is based on the differential pressure that obtains under the time at the different measuring that uses least fibre method and paired value (the Δ P of delivery space flow
i, Δ V
i) and calculate.
[0016] in addition, be used for being illustrated by the undocumented application DE 10 2,006 055 562.7 of the applicant's (submitting to) of soot on November 24th, 2006 based on the method for the balance of model.In the method, a plurality of feature charts have been stored, in each feature chart, the value of the characteristic variable of the carbon soot particles content in the exhaust that is fed to exhaust after treatment system in each case all assignment be the value of at least two separate state variablees, described separate state variable declaration the working state of predefined original state of motor vehicle.The estimation of the characteristic variable of the carbon soot particles content in being fed to the gas of exhaust after treatment system is carried out under at least one state different with original state by interpolation based on these feature charts.In this article, air/fuel ratio (λ value) and exhaust gas recirculatioon speed (EGR speed) are used as separate state variable (rather than the engine speed that uses of traditional convention and Engine torque or whole injection fuel and), and wherein rail pressure is used as further separate state variable.Air/fuel ratio (λ value) is directly measured herein and the soot concentration based on the λ value with power function form is used as basis during the estimation of the carbon soot particles content in the gas that is fed to exhaust after treatment system, i.e. (A*x
λ+ B, the C) function of form, A wherein, B and C all represent the function of EGR speed.For this method is described, the chart of choosing in above-mentioned application DE 10 2,006 055 562.7 invests Fig. 7 and Fig. 8.Fig. 7 shows the soot concentration as the function of the λ value of different EGR speed, promptly is used for estimating under standardized flox condition the feature chart of soot concentration, and described concentration produces in a plurality of variablees of working state.Fig. 8 shows the dependence of use soot concentration of interpolation on the soot concentration that the feature chart of Fig. 7 is being estimated, promptly described chart shows according to the comparison between the concentration of the soot concentration of the feature chart interpolation among Fig. 7 and each independent some place estimation.Therefore, the sane estimation of the mode of execution of compactness can be carried out by described method when having online application, and the degree of accuracy of wherein said method can be enhanced by the rail pressure that is considered as the 3rd independent parameter.
Description of drawings
[0017] the further careful explanation of the present invention can be found in specification and claims.To and describe with reference to the accompanying drawings based on preferred embodiment below the present invention.
[0018] in the accompanying drawings:
Fig. 1 is the block diagram that has illustrated according to strategy of the present invention;
Fig. 2 a-f shows the diagram of the situation that does not have " heat " adaptation;
Fig. 3 a-f shows the diagram of the situation of " heat " adaptation, and described " heat " adapts to and is used to use the soot of closed loop control estimation as the function of differential pressure;
Fig. 4 a-f shows the diagram of the situation of " heat " adaptation, and the exhaust gas oxygensensor in a particulate filter downstream is only used in described " heat " adaptation;
Fig. 5 a-f shows the diagram of the situation of " heat " adaptation, and the temperature transducer in a particulate filter downstream is only used in described " heat " adaptation;
Fig. 6 is the diagram of the association range that illustrated that the soot of the function that is estimated as differential pressure loads;
Fig. 7 shows the dependence as the soot concentration of the function of the λ value of different EGR speed, so that explanation is suitable for the method based on the balance of model of soot; And
Fig. 8 shows the dependence of use soot concentration of interpolation on the soot concentration that the feature chart of Fig. 7 is being estimated.
Embodiment
[0019] Fig. 1 shows the block diagram according to strategy of the present invention, and wherein single function will illustrate in greater detail following.The explanation of the signal name that uses among Fig. 1 provides in following table 1:
| Signal name | Minimum value | Maximum value | | Explanation |
| FRM_bDftLSA | ||||
| 0 | 1 | - | Exhaust gas oxygensensor | |
| FRM_bDft_tDsPFlt | ||||
| 0 | 1 | - | The reference value of DPF | |
| PFlt_bPFltEnaClc | ||||
| 0 | 1 | - | By the logical tab symbol of monitoring modular with | |
| PFlt_bPFltRgnReq | ||||
| 0 | 1 | - | The logical tab symbol of request soot regeneration | |
| PFlt_concO2_DsPFl t | -328 | 328 | ％ | The oxygen concentration in the downstream of particulate filter |
| PFlt_dPdVPFlt | -500 | 500 | kPa/(m 3/s) | The gradient dP that is calculated (differential pressure)/dV (volume flow) |
| |
0 | 500 | g | The soot storage quality that is used for closed loop control according to dP/ |
| PFlt_mfSotAdap | ||||
| 0 | 7 | g/s | The speed of the adaptation that soot loads | |
| PFlt_rSotCmbAdap | -215 | 215 | - | The adaptation signal of carbon-smoke combustion |
| PFlt_tDsPFltEstim | -3277 | 3277 | ℃ | The estimation temperature in the downstream of particulate filter |
| PFlt_tDsPFltMes | -3277 | 3277 | ℃ | The measurement temperature (delay) in the downstream of particulate filter |
| PFlt_tPFlt | -3277 | 3277 | ℃ | The DPF |
| PFlt_volEfcPFlt | ||||
| 0 | 66 | 1 | Effective filter volume that soot loads | |
| PFlt_tAmbMes | -3277 | 3277 | ℃ | |
| FRM_bDft_pPFltDif | ||||
| 0 | 1 | - | Diagnostic markers signature partial pressure |
| Signal name | Minimum value | Maximum value | Unit | |
| FRM_bDft_pUsOxC Abs | ||||
| 0 | 1 | - | Diagnostic markers symbol pressure transducer/ | |
| PFlt_volfEg | ||||
| 0 | 6.5535 | m 3/s | The delivery space | |
| PFlt_volEfcPFlt | ||||
| 0 | 65.535 | Litre | Effective | |
| PFlt_mSotOpl | ||||
| 0 | 500 | g | The soot of estimating loads, open loop control | |
| PFlt_concO2_DsPFl tMes | -328 | 328 | ％ | The oxygen concentration of the measurement in the downstream of particulate filter |
[0020] during load phase, if regeneration request does not activate in the time cycle at the minimum of a function as the filter-carrier temperature of estimating, then soot loading adaptation label symbol PFlt_bSotAdapEna activates in function block 110, and wherein the filter-carrier temperature must be positioned at more than the lower threshold (for the function of ambient temperature) and below upper limit threshold (for the function of ambient temperature).In addition, the delivery space flow velocity must be positioned at more than the lower threshold so that allow the adaptation of exhaust carbon fume mass flow.In addition, if detect mistake (fault) in differential pressure signal, then described adaptation is deactivated.
[0021] in function block 120, if acclimatization to cold (PFlt_bSotAdapEna=INCORRECT) does not take place and if in the sensor signal of the λ in diesel particulate filter downstream value and/or differential pressure and/or temperature, do not detect mistake, then carbon-smoke combustion adapts to tag mark PFlt_bSotCmbAdapEna and is activated.If the maximum value in bed temperature and the diesel particulate filter downstream temperature is higher than the threshold value of calibration, then described adaptation is activated.In similar mode, if the minimum value in the measurement temperature in filter downstream and the bed temperature is lower than the threshold value of calculating, then described adaptation is deactivated.If the thermometry in filter downstream is unavailable, then the condition of adaptive temperature is applied to bed temperature.
[0022] in function block 130, calculated soot and loaded the speed PFlt_mffSotAdap that adapts to.During load phase, the gradient PFlt_dPdVPFlt that calculates from the actual volume (being used to collect the pure filter volume of ash) of the volumetric flow rate of the differential pressure measured and calculating and particulate filter is used to calculate the upper limit threshold (PFlt_mSotDpDvmax of coherence a little less than being used for) of the storage quality of the lower threshold (mSotDpdVMin that is used for strong nominal coherence) of storage quality of soot and soot.
[0023] if the soot quality of estimating in the open loop control is lower than lower threshold, soot loads the speed that adapts to and is set to:
The speed that the soot loading adapts to=
(PFlt_mSotDpDvmin-PFlt_mSotOpl)/tiSotAdapMin (1)
[0024] wherein adaptation time constant tiSotAdapMin is the function of mSotDpdVMin, if sense high the loading thus, then fast adaptation is feasible.
[0025] in similar mode, if the quality of the soot PFlt_mSotOpl of estimation is greater than upper limit threshold PFlt_mSotDpDvmax in open loop control, then the speed of soot loading adaptation is set to afterwards:
The speed that the soot loading adapts to=
(PFlt_mSotDpDvmax-PFlt_mSotOpl)/tiSotAdapMax (2)
Wherein adaptation time constant tiSotAdapMax is the function of mSotDpdVMax, if wherein detect high the loading, then fast adaptation is feasible.
[0026] if soot is carried between the relevant upper limit threshold and lower threshold, the adaptation that soot loads does not then take place.
[0027] in function block 140, the computing activation energy adapts to factor PFlt_rSotCmbAdap.During the regeneration stage, promptly during carbon-smoke combustion, be used for carbon-smoke combustion non-catalytic, use multiplication factor (PFlt_rSotCmbAdap) to adapt to based on the dynamic (dynamical) activation energy of oxygen, this multiplication factor is calculated as observer's output, and the vector that (sensor-based usability) estimated wherein according to the present invention comprises in a plurality of or whole signals in the following standard signal one or these signals:
A) soot according to closed loop control loads, and it is standardized as analog value when adapting to beginning;
B) oxygen in particulate filter downstream, the scale value that its use can be calibrated and standardization, and
C) temperature in particulate filter downstream, the value that its use can be calibrated and standardization.
[0028] above implementation of strategies mode is presented among Fig. 2-5.
[0029] Fig. 2 shows does not have situation about adapting to, and wherein the temperature Error in Estimation of bed temperature is shown as with the temperature measured of diverse location place in the particulate filter and compares, and has shown the temperature Error in Estimation of downstream temperature.
[0030] according to Fig. 3, suppose when using acclimation to heat, unique obtain differential pressure and thermometric be the upstream of particulate filter.Adaptation scheme all is successful according to the estimation of temperature with according to the estimation of carbon-smoke combustion.According to Fig. 4,, then obtain similar result if the oxygen in downstream (λ) sensor is used as the single measuring device of the observer's who is used for adapting to structure.Fig. 5 shows a kind of situation, and wherein the temperature in particulate filter downstream is used in the adaptation scheme.
[0031] Fig. 6 shows a diagram, has wherein shown the relevant range that the soot as the Function Estimation of differential pressure loads.Soot loads with the g of unit with respect to having the kPa/m of unit
3The gradient dP/dV of/s (P=differential pressure; The V=volumetric flow rate) draws.Filled symbols is corresponding to weak relevant, and open symbols is corresponding to strong correlation.
Claims (10)
1. method that is used to control operations of exhaust gas post-processing device, in the method, the soot of described exhaust gas post-treatment device loads by changing rotational speed rate in conjunction with the soot loading speed of described exhaust gas post-treatment device with in the regeneration stage in conjunction with the soot in the described exhaust gas post-treatment device and estimated in load phase, and about the decision of the beginning of Regeneration Treatment and/or end as the function of described estimated result and make, wherein:
In order to estimate that described soot loads, measure by described exhaust gas post-treatment device or measure definite at least one differential pressure by the assembly of described exhaust gas post-treatment device;
Wherein in order to determine described soot loading speed and/or described soot conversion rate, the estimation based on model based on the estimation of model and/or described soot conversion rate of described soot loading speed is independent of the differential pressure of described measurement and carries out, wherein said based on model the soot loading speed and described soot conversion rate based on model is combined loads with the soot that forms based on model;
At least comprise that wherein the estimation based on differential pressure that the described soot of the differential pressure of described measurement loads is carried out at least provisionally, and
The described estimation based on model that wherein said soot loads is compared with the described estimation based on differential pressure that described soot loads, if and reach predetermined condition, the described soot of the described estimated service life based on model that then described soot loads loads described based on differential pressure estimation and proofread and correct.
2. method according to claim 1, if wherein the temperature of described exhaust gas post-treatment device is lower than first temperature threshold, then described soot loading speed is determined.
3. method according to claim 1 and 2, if wherein the temperature of described exhaust gas post-treatment device is more than second temperature threshold, then described soot conversion rate is determined.
4. according to the described methods among the claim 1-3, the described of wherein said soot loading speed carried out based on a stack features curve based on the estimation of model or the described estimation based on model of described soot conversion rate, and the amount of soot that the unit time deposits in the described exhaust gas post-treatment device of described indicatrix deducts the soot conversion rate of calculating and obtains on the basis of chemical dynamic model.
5. according to the described methods among the claim 1-4, wherein, except the differential pressure of described measurement, at least one calculating of the described exhaust gas post-treatment device of flowing through or the volume quality of measurement and the actual volume of considering the described exhaust gas post-treatment device of the ash deposition in the described exhaust gas post-treatment device are used to the estimation based on differential pressure that described soot loads.
6. according to the described methods among the claim 1-5, wherein, between described soot loading speed is regular really, in the time of only outside described soot based on model is carried in the described relevant range that loads based on the soot of differential pressure, correcting rate is added into described based on deducting from described soot based on model loads in the soot loading of model or with described correcting rate.
7. method according to claim 6, wherein, if described soot based on model is carried in below the lower limit of the described relevant range that described soot based on differential pressure loads, then correcting rate is added in the described soot loading based on model, the absolute value of the difference between wherein said correcting rate loads corresponding to the described lower limit of described relevant range with based on the soot of model multiply by proportionality factor, and
Wherein, if described soot based on model is carried in more than the CLV ceiling limit value of the described relevant range that described soot based on differential pressure loads, then correcting rate is deducted from described soot based on model loads, and the absolute value of the difference between wherein said correcting rate loads corresponding to the described CLV ceiling limit value of described relevant range and described soot based on model multiply by proportionality factor.
8. according to the described methods among the claim 1-7, wherein, in the described regeneration stage, described soot conversion rate based on model is adapted to by the multiplication that passes through activation energy adaptation factor that is included in the activation energy in the reaction Kinetics Model proofreaies and correct.
9. method according to claim 8, wherein said activation energy adapt to factor and determine by in the following reference value at least one:
A) the described value of described soot loading based on differential pressure, it is standardized as analog value when described correction begins;
B) the oxygenation measurement value in described exhaust gas post-treatment device downstream, it is standardized as the scale value that can be calibrated, and/or
C) temperature in described exhaust gas post-treatment device downstream, it is standardized as the scale value that can be calibrated.
10. device that is used to control operations of exhaust gas post-processing device, wherein said device are designed to carry out according to the described method of one of aforementioned claim.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008016792A DE102008016792B4 (en) | 2008-04-02 | 2008-04-02 | Method and device for controlling the operation of an exhaust aftertreatment device |
| DE102008016792.4 | 2008-04-02 |
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| Publication Number | Publication Date |
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| CN101571067A true CN101571067A (en) | 2009-11-04 |
| CN101571067B CN101571067B (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101332395A Expired - Fee Related CN101571067B (en) | 2008-04-02 | 2009-04-02 | Method and apparatus for controlling operation of exhaust gas post-treatment device |
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| CN (1) | CN101571067B (en) |
| DE (1) | DE102008016792B4 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109312653A (en) * | 2016-07-07 | 2019-02-05 | 标致雪铁龙汽车股份有限公司 | Estimate the adjusting method of the soot combustion rate of the particulate filter of Thermal Motor |
| CN111911267A (en) * | 2019-05-09 | 2020-11-10 | 罗伯特·博世有限公司 | Method for operating a particle filter in an exhaust gas aftertreatment system of an internal combustion engine |
| CN113804596A (en) * | 2021-09-23 | 2021-12-17 | 中国第一汽车股份有限公司 | Soot loading system and loading method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9114344B2 (en) | 2012-12-12 | 2015-08-25 | GM Global Technology Operations LLC | Particulate filter regeneration management |
| DE102014203621B4 (en) * | 2014-02-27 | 2016-02-04 | Mtu Friedrichshafen Gmbh | A method for detecting ashes in a particulate filter of an exhaust aftertreatment system of an internal combustion engine, control device and internal combustion engine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4513593B2 (en) * | 2005-02-15 | 2010-07-28 | 株式会社デンソー | Exhaust gas purification device for internal combustion engine |
| JP4956784B2 (en) * | 2006-03-07 | 2012-06-20 | 日産自動車株式会社 | Particulate accumulation amount detection device and detection method for exhaust gas purification filter |
| DE102006021303B4 (en) * | 2006-05-08 | 2009-04-16 | Ford Global Technologies, LLC, Dearborn | Method for monitoring and / or controlling at least one exhaust aftertreatment system of an internal combustion engine |
| EP1854971B1 (en) | 2006-05-09 | 2009-08-05 | Ford Global Technologies, LLC | Method and apparatus for the estimation of the particle filter loading |
| JP4863111B2 (en) * | 2006-08-31 | 2012-01-25 | 株式会社デンソー | Exhaust purification device |
| DE102006055562B4 (en) | 2006-11-24 | 2009-10-15 | Ford Global Technologies, LLC, Dearborn | Method and device for estimating the soot emissions of an internal combustion engine |
-
2008
- 2008-04-02 DE DE102008016792A patent/DE102008016792B4/en not_active Expired - Fee Related
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2009
- 2009-04-02 CN CN2009101332395A patent/CN101571067B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109312653A (en) * | 2016-07-07 | 2019-02-05 | 标致雪铁龙汽车股份有限公司 | Estimate the adjusting method of the soot combustion rate of the particulate filter of Thermal Motor |
| CN111911267A (en) * | 2019-05-09 | 2020-11-10 | 罗伯特·博世有限公司 | Method for operating a particle filter in an exhaust gas aftertreatment system of an internal combustion engine |
| CN111911267B (en) * | 2019-05-09 | 2024-02-27 | 罗伯特·博世有限公司 | Method for operating a particle filter in an exhaust gas aftertreatment system of an internal combustion engine |
| CN113804596A (en) * | 2021-09-23 | 2021-12-17 | 中国第一汽车股份有限公司 | Soot loading system and loading method thereof |
| CN113804596B (en) * | 2021-09-23 | 2024-05-03 | 中国第一汽车股份有限公司 | Soot loading system and loading method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101571067B (en) | 2013-01-23 |
| DE102008016792A1 (en) | 2009-10-08 |
| DE102008016792B4 (en) | 2011-06-30 |
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