CN110410186A - The detection method and system of particle object amount, storage medium and control unit - Google Patents
The detection method and system of particle object amount, storage medium and control unit Download PDFInfo
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- CN110410186A CN110410186A CN201810383136.3A CN201810383136A CN110410186A CN 110410186 A CN110410186 A CN 110410186A CN 201810383136 A CN201810383136 A CN 201810383136A CN 110410186 A CN110410186 A CN 110410186A
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- soot
- diesel particulate
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- mapping
- particulate filters
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
-
- 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
- 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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- 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 method of the particle object amount for diesel particulate filters (31) capture that the invention discloses a kind of for detecting diesel engine, the method at least include the following steps: detecting the diesel particulate filters (31) whether under deterioration operating condition；And deteriorate under operating condition if detecting that the diesel particulate filters (31) are in, it introduces corrected parameter (c) and calculates the particle object amount, otherwise do not introduce corrected parameter (c) and calculate the particle object amount.The invention also discloses a kind of corresponding system, computer readable storage medium and control units.By introducing corrected parameter in the case where diesel particulate filters are in and deteriorate operating condition, accuracy in computation can be improved or making calculated carbon soot particles amount slightly larger than practical carbon soot particles amount, so as to accurately provide regeneration instructions and meet corresponding laws and regulations requirement.
Description
Technical field
The side for the particle object amount that the diesel particulate filters that the present invention relates to a kind of for detecting diesel engine capture
Method, a kind of corresponding system, a kind of computer readable storage medium and a kind of control unit for vehicle.
Background technique
Diesel engine is widely used in certain fields because of the advantages that torque is big, economic performance is good.However, right
For diesel engine, when work, can generate the exhaust gas comprising many harmful components such as particulate matter, nitrogen oxides.Particle owner
If carbon, commonly referred to as soot, it can not only be rendered as flue dust and pollute air, it is often more important that, tiny particulate matter can be deep
The lung for entering people causes to damage to lung.These particulate matters are adsorbed with toward contact much different degrees of mutagenesis and carcinogenesis
Organic substance, such as polycyclic aromatic hydrocarbon.
Therefore, current diesel engine is generally fitted provided with diesel particulate filters, to meet increasingly strict ring
Guaranteed request.Diesel particulate filters are typically mounted in the exhaust system of diesel engine the deleterious particle reduced in exhaust gas
Object.
Diesel particulate filters are mainly made of particulate matter filtration system and regenerative system two parts.Particulate matter filtering system
With the problems such as being increasing, will cause discharge back pressure raising of particulate matter of capture, back pressure increases to be influenced whether to start system again
The dynamic property and economy of machine.Therefore, it is necessary to detect the carbon soot particles amount of diesel particulate filters capture, in diesel particulate object
When the carbon soot particles amount of filter reaches predetermined threshold, starts regenerative system, such as particulate matter is removed by high-temp combustion, restore
The performance of diesel particulate filters.
Currently, carbon soot particles amount is usually calculated indirectly by model.However, for soot detection model, it
The raw emissions of engine are highly dependent on, may be such that model is no longer quasi- when the failure of some components, such as oil leak
Really.For the calculation method based on pressure difference mainly for commercial vehicle, pressure difference is usually lower, in this case, pressure difference sensing
The tolerance of the batch production of the error and carrier of device can make it possible to accurately to detect along with the influence of passive regeneration
Carbon soot particles amount.For this purpose, there is an urgent need to the detection methods to existing carbon soot particles amount to improve, so that diesel particulate object mistake
Filter can efficiently work always.
Summary of the invention
The object of the present invention is to provide a kind of improved diesel particulate filters captures for detecting diesel engine
Particle object amount method, a kind of corresponding system, a kind of computer readable storage medium and a kind of control for vehicle
Unit prevents diesel particulate filters from the case where cause thermal damage occurred to improve the reliability of detection model.
According to the first aspect of the invention, it provides a kind of for detecting the diesel particulate filters of diesel engine
The method of the particle object amount of capture, the method at least include the following steps: detecting whether the diesel particulate filters are located
In deteriorating under operating condition；And deteriorate under operating condition if detecting that the diesel particulate filters are in, introduce corrected parameter meter
The particle object amount is calculated, corrected parameter is not otherwise introduced and calculates the particle object amount.
According to the second aspect of the invention, it provides a kind of for detecting the diesel particulate filters of diesel engine
The system of the particle object amount of capture, the system comprises: control unit, described control unit are configured to: detecting the diesel oil
Whether particulate filter, which is in, deteriorates under operating condition, deteriorates under operating condition if detecting that the diesel particulate filters are in,
It introduces corrected parameter and calculates the particle object amount, otherwise do not introduce corrected parameter and calculate the particle object amount.
According to the third aspect of the present invention, a kind of computer readable storage medium is provided, program is stored thereon with and refers to
It enables, wherein the step of described program instruction realizes the method when being executed by processor.
According to the fourth aspect of the present invention, a kind of control unit for vehicle is provided, described control unit includes
Memory, processor and storage are on a memory and the program instruction that can run on a processor, wherein the processor
The step of realizing the method when executing described program instruction.
By diesel particulate filters be in deteriorate operating condition under introduce corrected parameter, can be improved accuracy in computation or
Make calculated carbon soot particles amount slightly larger than practical carbon soot particles amount, so as to accurately provide regeneration instructions and meet corresponding
Laws and regulations requirement.
Detailed description of the invention
In the following, by the way that referring to attached drawing, the present invention will be described in more detail, may be better understood the principle of the present invention, feature and
Advantage.Attached drawing includes:
Fig. 1 diagrammatically illustrates the schematic block diagram of an engine and exhaust gas treatment system.
Fig. 2 shows the schematic diagrames of an existing model.
Fig. 3 shows two different linear relationships between exhaust pressure difference and the cube of volume flow.
The proportionality coefficient that Fig. 4 is shown between exhaust pressure difference and the cube of volume flow changes with time.
The corrected parameter that introduces that Fig. 5 shows an exemplary embodiment according to the present invention calculates carbon soot particles amount
Model.
The corrected parameter that introduces that Fig. 6 shows another exemplary embodiment according to the present invention calculates carbon soot particles amount
Illustraton of model.
Fig. 7 show another exemplary embodiment according to the present invention judging diesel particulate filters be in dislike
The schematic diagram for the model how being modified when under chemical industry condition.
Fig. 8 shows the process of the method for determining carbon soot particles amount of an exemplary embodiment according to the present invention
Figure.
Specific embodiment
In order to keep the technical problems to be solved by the invention, technical solution and beneficial technical effect more clear bright
White, below with reference to attached drawing and multiple exemplary embodiments, the present invention will be described in further detail.It should be appreciated that herein
It is described that the specific embodiments are only for explaining the present invention, rather than for limiting the scope of protection of the present invention.
Fig. 1 diagrammatically illustrates the schematic block diagram of an engine and exhaust gas treatment system.The diesel oil of diesel vehicle is sent out
After motivation 10 starts, exhaust gas is conducted via exhaust pipe 20 to exhaust gas treatment system 30.The exhaust gas treatment system 30 packet
Diesel particulate filters 31 are included, for filtering the particulate matter in exhaust gas.Filtered exhaust gas is again via at exhaust gas discharge
The exhaust pipe 20 of reason system 30 is discharged to outside diesel vehicle.
Currently, having existed a variety of determining diesel particulate filters according to different situations, for example for different automobile types
The method of 31 carbon soot particles amount.
For example, first way is, pressure is respectively set in the entrance of diesel particulate filters 31 and outlet both ends and passes
Sensor 32 and 33, for detecting the pressure at expulsion of entrance and exit.ECU (the electronic control of control unit 40, such as diesel vehicle
Unit) from the two pressure sensors 32 and 33 pressure detection value is obtained, and according to the exhaust pressure difference △ p between entrance and outlet
Extrapolation obtains the carbon soot particles amount trapped in diesel particulate filters 31.It is of course also possible to which a pressure difference is arranged
Sensor, directly the pressure difference △ p between the entrance and outlet of measurement diesel particulate filters 31.With the carbon soot particles of capture
The increase of amount, exhaust gas no longer easily flow through diesel particulate filters 31, i.e., the flow resistance of diesel particulate filters 31 at this time compared with
Greatly, the pressure difference △ p between entrance and outlet can correspondingly increase.At this point, model is by a relatively simple, input parameter is predominantly pressed
Difference.
Certainly, which can also introduce other input parameters, for example, the volume flow q of exhaust gas, speed v etc..Fig. 2 shows
The schematic diagram of this model is gone out, model f (△ p, q, v) calculates carbon soot particles amount Sw1 according to the signal of input.This method is outstanding
It is suitable for being lightly loaded diesel vehicle.
Control unit 40 can be respectively controlled diesel engine 10 and exhaust gas treatment system 30.For example, root
According to needs, control unit 40 can issue instruction diesel particulate filters 31 to exhaust gas treatment system 30 and regenerated
The instruction of journey.
The second way is: having previously been based on waste gas emission standard come when calculating the regeneration for carrying out diesel particulate filters 31
The duty parameter of permitted diesel vehicle, such as (between regenerative process starting twice) mileage travelled, the fortune of diesel engine
Row time and oil consumption aggregate-value etc., the duty parameter for being then based on the calculated in advance provides a predetermined value, pre- whenever reaching this
After definite value, regenerated by 40 direct instruction diesel particulate filters 31 of control unit.At this point, the input parameter of model is main
Including mileage travelled, the runing time of diesel engine and oil consumption aggregate-value.With the increase of mileage travelled, motor vehicle emission
Exhaust gas total amount also will increase, therefore the carbon soot particles amount that diesel particulate filters 31 capture also will increase.Similarly, diesel oil
The carbon soot particles amount of 31 capture of grain object filter also can with the runing time of diesel engine and the increase of oil consumption aggregate-value and
Increase.Certainly, other input parameters can also be introduced.
The third mode is: for a standard diesel oil vehicle (or being the vehicle for test of putting on record) in test mode
Lower its bavin under different duty parameters (for example, different engine speed, the oil consumption of unit time, charge flow rate etc.) of test
Then the carbon soot particles amount that oil particles object filter traps arrive is recorded them as basic parameter table storage.Hereafter, needle
To other diesel vehicles of same model, basic parameter table according to the storage after each regenerative process (i.e. it is next again
Before life starts), according to the actual duty parameter of the diesel vehicle (such as engine speed, oil consumption of unit time etc.) by controlling
Unit infers the carbon soot particles amount trapped in diesel particulate filters, after the carbon soot particles amount is accumulated to certain value,
It is regenerated by control unit direct instruction diesel particulate filters 31.At this point, the input parameter of model includes above-mentioned various
Duty parameter.The model compares cumulative reckoning using tabling look-up.This is especially suitable for HD diesel vehicle.
It in practice, can also be with that for determining that starting regenerated model is not limited to above-mentioned three kinds of modes, between them
This combination or mutually amendment, the present invention do not carry out any restrictions to the type of model.In other words, as long as model can be based on input
A variety of evaluation methods are described in parameter estimation carbon soot particles amount, such as CN102628386A etc..
However, either at present there is detection inaccuracy, will cause too early, mistake sometimes in which kind of model, discovery
Frequent regeneration, will cause sometimes and regenerates too late.Too early, excessively frequent regeneration will cause energy dissipation, reduce diesel particulate object
The service life of filter deteriorates the dilution of machine oil, and regeneration may make ignition temperature excessively high and make diesel particulate object again too late
Filter generates the danger hardening cracked, and the exhaust gas of discharge is also no longer met environmental requirements, and can also reduce the workability of diesel engine
Energy.Obviously, regeneration too early relatively, regenerated too late dangerous and harm is bigger, therefore, highly desirable accurately to estimate or fit
When too greatly estimating carbon soot particles amount, so as to trigger initiative regeneration in time or a little earlier.
Regeneration too late means that the carbon soot particles amount of actual acquisition is greater than through the calculated carbon soot particles amount of model, reason
It is generally placed upon the deterioration operating condition for not accounting for diesel particulate filters 31.In particular, the air system of such as engine and/
Or fuel system or diesel particulate filters 31 can make diesel particulate when occurring certain unusual condition or extreme situation in itself
Object filter 31 is in quick stress state, if this quick stress state is not found and considered in time, having can
Energy meeting passes through the calculated carbon soot particles amount of model so that practical carbon soot particles amount is greater than, and regenerates too late to will cause.
For this purpose, cannot at least fail to judge diesel oil firstly the need of the deterioration operating condition for reliably detecting diesel particulate filters 31
The deterioration operating condition of particulate filter 31.It is in diesel particulate filters 31 there are many factors for deteriorating operating condition, below only
It is illustratively described and which information may determine that diesel particulate filters 31 are under deterioration operating condition by.
1) the first exemplary judgment method
There are following functional relations between exhaust pressure difference △ p and volume flow q:
Δ p=k*q3 (1)
Wherein, k is proportionality coefficient.
Obviously, linear between pressure difference △ p and the cube of volume flow q, diesel particulate filters 31 capture
Carbon soot particles amount it is bigger, proportionality coefficient k is bigger, and pressure difference △ p is also bigger.
The functional relation under two kinds of different situations is shown in Fig. 3.What linear relationship y1 was indicated is new original
The case where diesel particulate filters, proportionality coefficient k1 is smaller, and what linear relationship y2 was indicated is that diesel particulate filters have been expired
The case where load, proportionality coefficient k2 ratio k1 are big.
K1 can be determined when vehicle uses for the first time, be then store in corresponding memory.If having replaced new bavin
All capture substances in oil particles object filter or fully erased diesel particulate filters, can also be by measuring at this time
Volume flow q and pressure difference the △ p of exhaust gas determine k1.When necessary, detection calibration k1 can also be passed through.For the sake of more acurrate,
Even new diesel particulate filters, regeneration will be started before each determining k1, to eliminate any possible soot.
Judge that diesel particulate filters are in full load condition and needing to trigger regenerated pressure difference △ p can predefine.Base
Proportionality coefficient k2 can be determined by the volume flow q of exhaust gas in predetermined pressure difference △ p.
An exemplary embodiment according to the present invention can select a volume flow to guarantee the determining accuracy of k value
Section is measured, the volume flow q only measured is located at the calculating for just implementing proportionality coefficient k in the volume flow section, in Fig. 3
Shown in dash box 1.
Another exemplary embodiment according to the present invention can be pre- by calculating in order to guarantee the determining accuracy of k value
The average value of k value in timing section is as current k value to be requested.For those skilled in the art, it can also take
Other processing methods, such as other low-pass filtering techniques come so that the k value sought has higher reliability.
Diesel particulate filters are gradually to accumulate soot particulate in normal operation, this shows as, ratio
Coefficient k in the section between k1 and k2 as the working time t of engine is about linear change, such as the dotted line 2 in Fig. 4
It is shown.
An exemplary embodiment according to the present invention defines a variable r to reflect the variation speed of k value, such as formula (2)
It is shown:
Wherein, △ k indicates the variable quantity of the k value in the △ t time.When the variation of k value acutely makes r be greater than predetermined threshold r1
When, then it is assumed that diesel particulate filters are in quick stress state, deteriorate under operating condition.
An exemplary embodiment according to the present invention, the average value that can also calculate the r value in a period of time, which is used as, to be wanted
Determining r value, to reduce erroneous judgement.
As shown in figure 4, solid line 3 has bigger slope than dotted line 2, k value variation at this time is indicated acutely, it can be considered that
Diesel particulate filters, which are in, to be deteriorated under operating condition.
2) second of exemplary judgment method
The air system of diesel engine generally includes gas recirculation system and turbo charge system, wherein exhaust gas is again
The circulatory system is coupled between exhaust pipe and air inlet pipe, and for example including exhaust gas recirculation valve, cooler for recycled exhaust gas etc.
Component, turbo charge system are coupled to exhaust pipe to increase the admission pressure of diesel engine using the exhaust gas in exhaust pipe, and
And for example including components such as booster, booster shaft, air compressors.Gas recirculation system and turbo charge system all connect
The exhaust gas in exhaust pipe is received, their charge flow rate is controlled by exhaust gas recirculation valve and pressure charging valve respectively.In work, control
Control unit 40 shown in unit processed, such as Fig. 1 generates corresponding exhaust gas recirculation valve driving letter according to the operating condition of engine
Number and pressurization valve drive signal, to control the aperture of exhaust gas recirculation valve and pressure charging valve respectively.
When air system operation irregularity, when for example breaking down, it is possible to no longer into the air in the cylinder of engine
The diesel oil that can be sparged into cylinder efficiently burns, to will affect exhaust gas constituents.For this purpose, for example control unit 40 is worked
Air system is detected in journey, if there is abnormal conditions, then can generate air system error signal, the generation of the error signal
It might mean that diesel particulate filters are in deteriorate under operating condition.
3) the third exemplary judgment method
The very important parameter when air-fuel ratio α for indicating the mixing ratio of air and diesel oil is engine operation is right
Exhaust emissions, the dynamic property of engine and economy all have a great impact.Air-fuel ratio α is greater than the gaseous mixture of chemically correct fuel α 1
Referred to as lean mixture, gas heavy wool is few, and completely, oil consumption is low for burning, and pollution is small, but power is smaller.Air-fuel ratio α is less than chemically correct fuel
The gaseous mixture of α 1 is referred to as rich mixture, and the few oil of gas is more, and power is larger, but incomplete combustion, and oil consumption is high, pollution greatly, this meeting so that
Exhaust gas conditions deteriorate.For this purpose, an air-fuel ratio threshold alpha 2 can be set, when actual air-fuel ratio α is lower than the air-fuel ratio threshold alpha 2
It may determine that diesel particulate filters are in deteriorate under operating condition.
When the injection system of engine occurs abnormal, distributive value may be influenced, and then can also cause the change of air-fuel ratio α
Change, therefore, can reflect the situation of injection system to a certain extent by the variation of air-fuel ratio α.
An exemplary embodiment according to the present invention can be by calculating the sky in predetermined period in order to avoid erroneous judgement
Combustion is than the average value of α as current α value to be requested.
It in practice, can also be based on using air-fuel ratio α as the other parameters of function variable, (modification i.e. based on air-fuel ratio is joined
Number), the ratio λ of such as actual air-fuel ratio and chemically correct fuel judge whether diesel particulate filters are in deterioration operating condition
Under, this is actually also based on what air-fuel ratio was judged.
The foregoing describe can error signal based on the becoming larger of proportionality coefficient k, in relation to air system generation or air-fuel
Than α become smaller judge diesel particulate filters be in deteriorate operating condition under, it shall be apparent to one skilled in the art that these
It is merely exemplary, and not restrictive, such as can also be judged using any combination between them.Influence exhaust gas at
There are many kinds for the parameter and factor divided, as long as can judge that the particulate matter that the needs in exhaust gas filter becomes more and makes diesel particulate
Object filter, which is in, to be deteriorated under operating condition.
According to the present invention, it when judging that diesel particulate filters are under deterioration operating condition, needs to carry out soot model
Amendment so that soot model more accurately calculates the carbon soot particles amount of diesel particulate filters capture, and/or allows suitably
Too greatly estimate carbon soot particles amount, though this is because appropriate prematurely triggering initiative regeneration be not it is optimal, may insure to keep away
Exempt from diesel particulate filters and superheating phenomenon occurs.
In order to more clearly, more universally state how correction model, it is as follows to define a general purpose function relational expression:
Sw=f (c, x) (3)
Wherein, Sw indicates carbon soot particles amount, f representative function relationship, and c is corrected parameter, and x indicates other input parameters, example
It such as can be pressure difference △ p, volume flow q, speed v.It should be pointed out that the quantity of corrected parameter and other parameters is unrestricted
System.
A preferred exemplary embodiment according to the present invention, above-mentioned formula (3) can be with modification are as follows:
Sw=f (c, Sw1) (4)
Wherein, Sw1 indicates not considering the soot that the deterioration condition calculating of diesel particulate filters obtains as described above
Grain amount, can be calculated by existing model, then be re-introduced into corrected parameter c and be modified to Sw1.
Carbon soot particles amount is calculated according to formula (4), can simplify calculating, calculation amount is reduced, this is because can not change
Existing model and only the calculated result of existing model is modified.By this method, it can be easy to existing mould
Type is modified, and without re-starting programming, while improving the reliability of system.
Another preferred exemplary embodiment according to the present invention is based on carbon soot particles amount Sw1 using following formula (5)
Calculate carbon soot particles amount Sw:
Sw=f (c) * Sw1 (5)
Wherein, f (c) indicates the correction function based on corrected parameter c, can be further simplified in this way to carbon soot particles amount Sw
Calculating.
The corrected parameter c that introduces that Fig. 5 shows an exemplary embodiment according to the present invention calculates carbon soot particles amount
Model.As shown in figure 5, a submodel, i.e. function f (c) can be constructed to calculate modifying factor β, then modifying factor β
It is input to together with pressure difference △ p, volume flow q, speed v in model f (△ p, q, v, β) and calculates carbon soot particles amount.
The corrected parameter c that introduces that Fig. 6 shows another exemplary embodiment according to the present invention calculates carbon soot particles
The model of amount.As shown in fig. 6, flow signal q is introduced in a submodel after being corrected parameter c amendment to generate amendment
Flow signal q ', be then input in model f (△ p, q, v), so as to do not change existing model input parameter
Several and type, and then do not need to change existing model.
Fig. 7 show another exemplary embodiment according to the present invention judging diesel particulate filters be in dislike
The schematic diagram for the model how being modified when under chemical industry condition.
As shown in fig. 7, the model includes conventional model part and amendment part, conventional model part includes soot static state row
I and soot Dynamic Emission mapping III are penetrated in projection, and correction portion point includes soot static drain mapping fair curve II and soot dynamic
Discharge amendment mapping IV.Soot static drain mapping I and soot static drain mapping fair curve II are connected to the first switching and open
4 are closed, soot Dynamic Emission mapping III and soot Dynamic Emission amendment mapping IV are connected to the second switching switch 5.Soot static state row
The input parameter that projection penetrates I is engine speed n and distributive value b, and soot static drain maps the input parameter of fair curve II
Change the variable r of speed for reflection k value.Soot Dynamic Emission mapping III input parameter be actual ratio λ and actual ratio λ with
Poor λ-λ 1 between theoretical ratio λ 1, the input parameter and soot Dynamic Emission of soot Dynamic Emission amendment mapping IV map III
It is identical.When diesel particulate filters are in nominal situation, the first switching switch 4 and the second switching switch 5 are in the first work
Make state, as shown in fig. 7, passing through the superposition calculation soot of soot static drain mapping I and soot Dynamic Emission mapping III at this time
Grain amount.When diesel particulate filters, which are in, to be deteriorated under operating condition and generate trigger signal 6, the first switching switch 4 and second
Switching switch 5 is switched to the second working condition under the triggering of trigger signal 6, i.e., switches downwards in Fig. 7, pass through soot at this time
Static drain maps fair curve II and soot Dynamic Emission amendment mapping IV calculates carbon soot particles amount, wherein soot static state row
Projection penetrate fair curve II first correct soot static drain mapping I, for example with soot static drain mapping I is multiplied acquisition soot it is quiet
State discharge amendment mapping V, as shown in the appended drawing reference 7 in Fig. 7, then soot static drain amendment mapping V is dynamic with soot again
State discharge amendment IV superposition calculation carbon soot particles amount of mapping.
An exemplary embodiment according to the present invention, soot static drain map fair curve II and correct soot static state row
Projection penetrate I and make soot static drain amendment mapping V be greater than soot static drain mapping I and/or soot Dynamic Emission repair
Positive mapping IV for example makes the amendment mapping IV of soot Dynamic Emission in identical input parameter by using bigger calibration coefficient
It is greater than soot Dynamic Emission mapping III down.Amendment in this way can more accurately reflect practical carbon soot particles amount or make
Calculated carbon soot particles amount is slightly larger than practical carbon soot particles amount, can thus trigger initiative regeneration in time or a little earlier.
In practice, influence of the corrected parameter c to carbon soot particles amount can be then based on the influence by testing or emulating determination
Such as it constructs a correction function f (c) and is stored in the memory of control unit 40 or is stored in an individual memory
In.When needing to calculate carbon soot particles amount, while considering that the corrected parameter c obtained participates in carbon soot particles by correction function f (c)
The calculating of amount, it is thus possible to improve the computational accuracy of carbon soot particles amount and/or ensure that calculated carbon soot particles amount will not be obvious
Less than practical carbon soot particles amount.For example, the vehicle of different model can be tested or be emulated accordingly respectively to determine amendment
Function.For cumulatively calculating carbon soot particles amount, the influence of corrected parameter c will be considered in each calculate.
An exemplary embodiment according to the present invention can store correction function f (c) in a look-up table, this
Sample can reduce calculation amount.
Fig. 8 shows the process of the method for determining carbon soot particles amount of an exemplary embodiment according to the present invention
Figure.
This method is started with step S1.In step s 2, judge whether diesel particulate filters are in deteriorate under operating condition.
It if it is (Y), then advances in step S3, carbon soot particles amount is calculated in the case where introducing corrected parameter c.(N) if not, then
It advances in step S4, carbon soot particles amount is calculated in the case where not introducing corrected parameter c, is counted for example, by using conventional model
It calculates.In step s 5, carbon soot particles amount Sw is obtained.
After carbon soot particles amount Sw has been determined, it is compared with the threshold value of setting, judges whether to need to issue again
Raw instruction.
By largely testing discovery, by introducing corrected parameter in the case where diesel particulate filters are in and deteriorate operating condition,
Accuracy in computation can be improved or make calculated carbon soot particles amount slightly larger than practical carbon soot particles amount, so as to accurately mention
For regeneration instructions and meet corresponding laws and regulations requirement.
In addition, thought of the invention is suitable for any use although describing the present invention by taking diesel vehicle as an example above
The equipment of diesel engine.
Although only certain exemplary embodiments of this invention is described in detail here, they are used for the purpose of the purpose explained and give
Out, and it is not considered that they are construed as limiting the scope of the present invention.Without departing from the spirit and scope of the present invention, respectively
Kind replacement, change and transformation can be contemplated out.
Claims (12)
1. a kind of method of the particle object amount of diesel particulate filters (31) capture for detecting diesel engine, the side
Method at least includes the following steps:
The diesel particulate filters (31) are detected whether under deterioration operating condition；And
Deteriorate under operating condition if detecting that the diesel particulate filters (31) are in, introduces described in corrected parameter (c) calculating
Otherwise particle object amount does not introduce corrected parameter (c) and calculates the particle object amount.
2. the method as described in claim 1, which is characterized in that
● a proportionality coefficient k is defined by following formula (1):
Wherein, △ p indicates that the pressure difference between the entrance and outlet of diesel particulate filters (31), q indicate the volume flow of exhaust gas
Amount, and a variable r is defined to reflect the variation speed of proportionality coefficient k by following formula (2):
Wherein, △ k indicates the variable quantity of the proportionality coefficient k in the △ t time, if the variable is greater than the first predetermined threshold,
Judge that diesel particulate filters (31) are in deteriorate under operating condition；And/or
● judge that diesel particulate filters (31) are in based on the generation of the error signal of the air system of diesel engine
Deteriorate under operating condition；And/or
● by being compared to air-fuel ratio or modification parameter based on air-fuel ratio and the second predetermined threshold to judge diesel particulate
Whether object filter (31) is under deterioration operating condition.
3. method according to claim 2, which is characterized in that
The calculating that just executes to the proportionality coefficient is in predetermined volume flow rate zone in the volume flow.
4. method as claimed in claim 2 or claim 3, which is characterized in that
The corrected parameter includes at least one of the variable, the air-fuel ratio and described modification parameter.
5. the method as described in any in claim 1-4, which is characterized in that
The correction function based on the corrected parameter is constructed, based on the correction function to calculating when being not introduced into the corrected parameter
Out first estimates particle object amount and is modified to calculate the particle object amount.
6. such as method as claimed in any one of claims 1 to 5, which is characterized in that
The particle object amount is calculated by constructing model, and the model includes basic model part and amendment part, wherein
The basic model part includes the mapping of soot static drain and the mapping of soot Dynamic Emission, and the correction portion point includes that soot is quiet
State discharge amendment mapping and soot Dynamic Emission amendment mapping, the corrected parameter be soot static drain amendment mapping and/or
The input parameter of soot Dynamic Emission amendment mapping deteriorates under operating condition if detecting that diesel particulate filters (31) are in,
It is otherwise quiet based on soot based on particle object amount described in soot static drain amendment mapping and soot Dynamic Emission amendment mapping calculation
Particle object amount described in state discharge mapping and soot Dynamic Emission mapping calculation.
7. method as claimed in claim 6, which is characterized in that
The variable is set to the soot static drain amendment mapping as the first corrected parameter in the corrected parameter
Input parameter, the air-fuel ratio and/or the modification parameter are set as the second corrected parameter in the corrected parameter
The input parameter of mapping and/or the mapping of soot Dynamic Emission is corrected for the soot Dynamic Emission.
8. the method for claim 7, which is characterized in that
Fair curve is constructed based on the variable, and institute is generated based on soot static drain mapping and the fair curve
State the amendment mapping of soot static drain；And/or
The modification parameter includes the first modification parameter and the second modification parameter different from the first modification parameter, and described first becomes
Shape parameter and the second modification parameter are set to the input of the soot Dynamic Emission amendment mapping and the mapping of soot Dynamic Emission
Parameter.
9. a kind of system of the particle object amount of diesel particulate filters (31) capture for detecting diesel engine, the system
System includes:
Control unit (40), described control unit (40) are configured to: detecting whether the diesel particulate filters (31) are located
In deteriorating under operating condition, deteriorates under operating condition if detecting that the diesel particulate filters (31) are in, introduce corrected parameter (c)
The particle object amount is calculated, corrected parameter (c) is not otherwise introduced and calculates the particle object amount.
10. system as claimed in claim 9, which is characterized in that
Described control unit (40) is the electronic control unit for controlling diesel engine work.
11. a kind of computer readable storage medium, is stored thereon with program instruction, wherein described program instruction is held by processor
The step of method described in any one of claims 1-8 is realized when row.
12. a kind of control unit for vehicle, described control unit includes memory, processor and stores on a memory
And the program instruction that can be run on a processor, wherein the processor realizes claim when executing described program instruction
In 1-8 the step of any described method.
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