CN109583140A - A kind of diesel exhaust gas method of calculating flux based on DPF post-processing control - Google Patents
A kind of diesel exhaust gas method of calculating flux based on DPF post-processing control Download PDFInfo
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- CN109583140A CN109583140A CN201811644838.9A CN201811644838A CN109583140A CN 109583140 A CN109583140 A CN 109583140A CN 201811644838 A CN201811644838 A CN 201811644838A CN 109583140 A CN109583140 A CN 109583140A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012805 post-processing Methods 0.000 title claims abstract description 16
- 230000004907 flux Effects 0.000 title claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims abstract description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 27
- 239000000446 fuel Substances 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000008929 regeneration Effects 0.000 abstract description 15
- 238000011069 regeneration method Methods 0.000 abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052799 carbon Inorganic materials 0.000 abstract description 14
- 238000000605 extraction Methods 0.000 description 6
- 230000003584 silencer Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention discloses a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control, with the pressure drop of downstream of DPF end exhaust pipe to atmospheric environment for the first pressure drop；The calculation formula of first pressure drop isWherein u is fitting coefficient constant, and α and β are index x constant, andFor exhaust mass flow；And K is to be vented opposite reference temperature；Described u, α and β solve to obtain using least square method.The present invention solves the problems, such as that the pressure drop of downstream of DPF gas exhaust piping is ignored, the present invention provides using exhaust mass flow and exhaust reference temperature as the experience function of pressure drop model of variable, so that the pressure drop of downstream of DPF gas exhaust piping is calculated and as the first pressure drop, so that still being able to accurately calculate DPF exhaust volumetric flow in the case where being fitted without back pressure transducer, the evaluated error to DPF carbon loading levels is advantageously reduced, DPF safety and reliable regeneration are promoted.
Description
Technical field
The invention belongs to the technical fields of diesel engine, and in particular to a kind of diesel oil based on DPF post-processing control
Machine extraction flow calculates method.
Background technique
Diesel particulate trap (hereinafter referred to as DPF) has become reduction exhaust emissions of diesel engine because of its high arresting efficiency
The essential post-processing technology of middle particulate matter quality (PM) and quantity (PN).DPF uses wall-flow design, by that will be vented
In particle collection realize eliminating particle object purpose on filtering body porous media surface or deposition wall surface.However, with
Engine operation, the accumulation of excessive particulate matter can cause engine exhaust back pressure to increase, lead to engine power performance and warp
Help penalty and DPF blocking etc..Therefore, when the soot load amount of DPF accumulation (hereinafter referred to as carbon carrying capacity) reaches safety again
When raw limit value, needs to implement initiative regeneration to DPF, restore exhaust back pressure.
According to the exhaust pressure difference signal of the upstream end DPF and downstream, and the extraction flow size of DPF is flowed through, can estimated
Carbon loading levels in DPF.The diesel exhaust gas flow for flowing through DPF can be sensed by being mounted on the pressure at expulsion of the upstream DPF
Device signal is simultaneously calculated.However, in general engineer application, the back pressure transducer because of considerations such as implementation costs often
It is cancelled.Therefore, in this case during calculating or obtaining DPF extraction flow, the pressure drop quilt of downstream of DPF gas exhaust piping
Ignore.This makes the DPF extraction flow and actual conditions that calculate or obtain there are bigger difference, based on the extraction flow size and
There is also large errors for the DPF carbon carrying capacity of pressure difference signal estimation, thus influence to control the initiative regeneration of DPF, it could even be possible to
Cause to regenerate risk.
Summary of the invention
The purpose of the present invention is to provide a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control, purports
The ignored problem of the pressure drop of downstream of DPF gas exhaust piping in solving the above problems, the present invention provides with exhaust mass flow
It is the experience function of pressure drop model of variable with exhaust reference temperature, so that the pressure drop of downstream of DPF gas exhaust piping and work be calculated
For the first pressure drop, so that still being able to accurately calculate DPF exhaust volume stream in the case where being fitted without back pressure transducer
Amount advantageously reduces the evaluated error to DPF carbon loading levels, promotes DPF safety and reliable regeneration.
The present invention is achieved through the following technical solutions: a kind of diesel exhaust gas flow based on DPF post-processing control
Calculation method, with the pressure drop of downstream of DPF end exhaust pipe to atmospheric environment for the first pressure drop；The calculation formula of first pressure drop is such as
Under:
Wherein, u is fitting coefficient constant, and α and β are index x constant, andFor exhaust mass flow；And K is exhaust
Opposite reference temperature；Described u, α and β solve to obtain using least square method.
In order to preferably realize the present invention, further, the α is 1~2, and the β is 1~2.U is a global system
Number.The formula of first pressure drop is by using the pressure drop of pressure sensor detection downstream of DPF gas exhaust piping, then corresponding survey
It measures exhaust mass flow, be vented opposite reference temperature, formula (1) is obtained by the Optimal Fitting of three's data.Wherein optimization is quasi-
The processing method of conjunction is the prior art and is not improvement of the invention, and so it will not be repeated.
In order to preferably realize the present invention, further, the exhaust mass flow is by engine fresh air quantity stream
Amount and fuel injection quantity flow sum to obtain.
It is further, described to be vented opposite reference temperature by downstream of DPF end delivery temperature in order to preferably realize the present invention
It is divided by obtain with environment temperature.
In order to preferably realize the present invention, further, the pressure difference signal at the both ends DPF is measured, engine exhaust is obtained and exists
The second pressure drop at a temperature of DPF upstream exhaust；First pressure drop, the second pressure drop and atmospheric environmental pressure sum to obtain upstream
Pressure at expulsion.
In order to preferably realize the present invention, further, according to DPF bed temperature, upstream exhaust pressure and exhaust mass flow,
And the exhaust volumetric flow for flowing through DPF is calculated based on the equation of gas state.
In order to preferably realize the present invention, further, the DPF bed temperature is DPF upstream and downstream end delivery temperature
Weighted sum, wherein weighting coefficient depends on the installation site of exhaust temperature sensor.
The present invention is that in order to overcome the above-mentioned deficiencies of the prior art, it is an object of the invention to be fitted without exhaust pressure
In the case where force snesor, it still is able to accurately calculate DPF extraction flow, so that high-precision DPF carbon carrying capacity estimated value is obtained,
So that the initiative regeneration control to DPF tends to optimize, promote safety and reliable regeneration, reduces system work risk.
Beneficial effects of the present invention:
(1) the present invention provides using exhaust mass flow and exhaust reference temperature as the experience function of pressure drop model of variable,
To which the pressure drop of downstream of DPF gas exhaust piping be calculated and as the first pressure drop, so that being fitted without back pressure transducer
In the case where still be able to accurately calculate DPF exhaust volumetric flow, advantageously reduce the evaluated error to DPF carbon loading levels,
Promote DPF safety and reliable regeneration.
(2) heretofore described u, α and β solve to obtain using least square method, and the α is preferably 1~2, and the β is preferred
It is 1~2, the data on flows accuracy of obtained diesel engine is high, has preferable practicability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of diesel emission after-treatment system；
Fig. 2 is flow diagram of the invention.
Wherein: 1- Engine ECU control unit, 2- diesel engine, 3- air flow sensor, 4- upstream exhaust pipe,
The upstream end 5- exhaust gas temperature sensor, 7- differential pressure pickup, the downstream 8-DPF, 10- exhaust gas temperature sensor, 11- downstream exhaust gas
Pipe, 12- silencer.
Specific embodiment
Embodiment 1:
A kind of diesel exhaust gas method of calculating flux based on DPF post-processing control, with the downstream DPF8 exhaust pipe to big
The pressure drop in compression ring border is the first pressure drop；The calculation formula of first pressure drop is as follows:
Wherein, u is fitting coefficient constant, and α and β are index x constant, andFor exhaust mass flow；And K is exhaust
Opposite reference temperature；Described u, α and β solve to obtain using least square method.
The present invention solves the above problems middle DPF8 downstream row tracheae 11 to the ignored problem of pressure drop of atmospheric environment, this hair
It is bright to provide using exhaust mass flow and exhaust reference temperature as the experience function of pressure drop model of variable, so that DPF8 be calculated
Downstream row tracheae 11 to atmospheric environment pressure drop and as the first pressure drop so that the case where being fitted without back pressure transducer
Under still be able to accurately calculate DPF8 exhaust volumetric flow, advantageously reduce the evaluated error to DPF8 carbon loading levels, promote
DPF8 safety and reliable regeneration.
Embodiment 2:
The present embodiment is to optimize on the basis of embodiment 1, and the exhaust mass flow is by engine fresh air
Mass flow and fuel injection quantity flow sum to obtain.It is described be vented opposite reference temperature by the downstream DPF8 delivery temperature and
Environment temperature is divided by obtain.The bed temperature of the DPF8 is the weighted sum of the upstream and downstream end delivery temperature of DPF8, wherein weighting
Coefficient depends on the installation site of exhaust temperature sensor.The pressure difference signal for measuring the both ends DPF8, obtains engine exhaust on DPF8
Swim the second pressure drop under delivery temperature；First pressure drop, the second pressure drop and atmospheric environmental pressure sum to obtain upstream exhaust
Pressure.According to the bed temperature of DPF8, upstream exhaust pressure and exhaust mass flow, and it is calculated and is flowed through based on the equation of gas state
The exhaust volumetric flow of DPF8.
It can be used for estimating DPF8 carbon carrying capacity according to the DPF8 exhaust volumetric flow and the second pressure drop, can be used as judgement
Reference frame starts or terminates for controlling DPF8 initiative regeneration.
The present invention solves the above problems middle DPF8 downstream row tracheae 11 to the ignored problem of pressure drop of atmospheric environment, this hair
It is bright to provide using exhaust mass flow and exhaust reference temperature as the experience function of pressure drop model of variable, so that DPF8 be calculated
Downstream row tracheae 11 to atmospheric environment pressure drop and as the first pressure drop so that the case where being fitted without back pressure transducer
Under still be able to accurately calculate DPF8 exhaust volumetric flow, advantageously reduce the evaluated error to DPF8 carbon loading levels, promote
DPF8 safety and reliable regeneration.
The other parts of the present embodiment are identical as above-described embodiment 1, and so it will not be repeated.
Embodiment 3:
The present embodiment is optimized on the basis of embodiment 1 or 2, as shown in Figure 1, diesel emission after-treatment system
Including Engine ECU control unit 1 and sequentially connected DPF8, diesel engine 2, silencer 12, the diesel engine 2
Front end be provided with air flow sensor 3, be provided with upstream end exhaust gas temperature sensor in the upstream exhaust pipe 4 of the DPF8
Downstream exhaust gas temperature sensor 10 is provided on the downstream row tracheae 11 of 5, the DPF8；At the both ends of DPF8, access pressure difference is passed
Sensor 7.The Engine ECU control unit 1 is separately connected DPF8, diesel engine 2, silencer 12, air flow sensor
3, upstream end exhaust gas temperature sensor 5, downstream exhaust gas temperature sensor 10, differential pressure pickup 7.
When engine operation, Engine ECU control unit 1 detects the measurement of air flow sensor 3 and obtains entering engine
Fresh air mass flowEngine ECU control unit 1 sprays fuel oil during controlling fuel injector oil spout simultaneously
FlowIt records and saves, the exhaust mass flow of engine is discharged as a result,For fresh air mass flowIt is sprayed with fuel oil
Penetrate mass flowSum
However, exhaust volumetric flow depends not only on exhaust mass flow, while by pressure at expulsion in exhaust system pipeline
It is influenced with delivery temperature.As shown in Figure 1, the bed temperature of DPF8 can be arranged by figure middle and upper reaches end exhaust gas temperature sensor 5 and downstream
Gas temperature sensor 10 is measured and is calculated, and the pressure drop at the both ends DPF8 is obtained by real-time detection differential pressure pickup 7, however is arranged
The pressure drop of tracheae to atmospheric environment be it is unknown, this to DPF8 volume flow it is accurate calculating bring difficulty, be unfavorable for DPF8
Initiative regeneration control optimization, to increase initiative regeneration risk.
In the present invention, the pressure difference signal at the both ends DPF8 is measured, obtains engine exhaust the DPF8 upstream exhaust at a temperature of
Second pressure drop；First pressure drop, the second pressure drop and atmospheric environmental pressure sum to obtain upstream exhaust pressure.According to DPF8's
Bed temperature, upstream exhaust pressure and exhaust mass flow, and the exhaust volume for flowing through DPF8 is calculated based on the equation of gas state
Flow.
The present invention solves the above problems middle DPF8 downstream row tracheae 11 to the ignored problem of pressure drop of atmospheric environment, this hair
It is bright to provide using exhaust mass flow and exhaust reference temperature as the experience function of pressure drop model of variable, so that DPF8 be calculated
Downstream row tracheae 11 to atmospheric environment pressure drop and as the first pressure drop so that the case where being fitted without back pressure transducer
Under still be able to accurately calculate DPF8 exhaust volumetric flow, advantageously reduce the evaluated error to DPF8 carbon loading levels, promote
DPF8 safety and reliable regeneration.
The other parts of the present embodiment are identical as embodiment 1 or 2, and so it will not be repeated.
Embodiment 4:
A kind of diesel exhaust gas method of calculating flux based on DPF post-processing control, as shown in Fig. 2, mainly including following
Step:
Measurement obtains engine fresh air mass flow and fuel injection quantity flow, and an exhaust quality is calculated
Flow；
The upstream and downstream end delivery temperature and environment temperature and atmospheric environmental pressure of measurement or acquisition DPF8, by described
The opposite reference temperature of exhaust is calculated in the downstream DPF8 delivery temperature and environment temperature；
According to the engine exhaust mass flow and it is vented opposite reference temperature, the downstream DPF8 exhaust pipe is calculated
To the pressure drop of atmospheric environment, and using the pressure drop as the first pressure drop；
The pressure difference signal for measuring the both ends DPF8 obtains second pressure of engine exhaust at a temperature of DPF8 upstream exhaust
Drop；
According to first pressure drop, the second pressure drop and atmospheric environmental pressure, three is summed to obtain DPF8 upstream row air pressure
Power；
On the bed temperature and the DPF8 of the DPF8 calculated according to the upstream and downstream end delivery temperature of the DPF8
Pressure at expulsion and the exhaust mass flow are swum, the exhaust volumetric flow for flowing through DPF8 is calculated based on the equation of gas state.
Preferably, the air quality flow, fuel injection quantity flow, environment temperature and pressure can easily from
It obtains in Engine ECU control strategy, is obtained wherein the air quality flow can also be measured by air flow sensor 3
?.
Preferably, the upstream and downstream end delivery temperature of the DPF8 is measured respectively by corresponding exhaust gas temperature sensor obtains.
Preferably, the exhaust mass flow is summed to obtain by air quality flow and fuel mass flow, the exhaust
Opposite reference temperature is divided by obtain by the downstream DPF8 delivery temperature and environment temperature.
Preferably, for calculating the first pressure drop Δ p1Function may be expressed as:Wherein u is
Fitting coefficient constant, α and β are index x constant, further to solve to obtain by test data and using least square method；AndFor the exhaust mass flow；And K is the opposite reference temperature of the exhaust.
Preferably, the second pressure drop Δ p2Differential pressure pickup 7 by monitoring the both ends DPF8 obtains.
Preferably, the bed temperature of the DPF8 is the weighted sum of the upstream and downstream end delivery temperature of the DPF8, wherein is added
Weight coefficient can be obtained by the specific installation site of corresponding exhaust temperature sensor, more actually to react mean temperature in DPF8.
Preferably, using calibrating gas state equation formula, the exhaust volumetric flow for flowing through DPF8 is calculated.
Preferably, further includes: according to the DPF8 exhaust volumetric flow and the second pressure drop Δ p2It can be used for estimating DPF8 carbon
Carrying capacity, the carbon carrying capacity can be used as judgment basis and start or terminate for controlling DPF8 initiative regeneration.
The present invention is by design using the exhaust mass flow and exhaust reference temperature as the experience function of pressure drop of variable
DPF8 downstream row tracheae 11 is calculated to the pressure drop of atmospheric environment and as the first pressure drop Δ p in model1, so that not pacifying
It still is able to accurately calculate DPF8 exhaust volumetric flow in the case where dress back pressure transducer, advantageously reduces and DPF8 carbon is carried
Horizontal evaluated error is measured, DPF8 safety and reliable regeneration are promoted.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is all according to
According to technical spirit any simple modification to the above embodiments of the invention, equivalent variations, protection of the invention is each fallen within
Within the scope of.
Claims (7)
1. a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control, which is characterized in that with downstream of DPF end row
The pressure drop of tracheae to atmospheric environment is the first pressure drop；The calculation formula of first pressure drop is as follows:
Wherein, u is fitting coefficient constant, and α and β are index x constant, andFor exhaust mass flow；And K is that exhaust is opposite
Reference temperature；Described u, α and β solve to obtain using least square method.
2. a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control according to claim 1, feature
It is, the α is 1~2, and the β is 1~2.
3. a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control according to claim 1, feature
It is, the exhaust mass flow is summed to obtain by engine fresh air mass flow and fuel injection quantity flow.
4. a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control according to claim 3, feature
It is, the reference temperature relatively that is vented is divided by obtain by downstream of DPF end delivery temperature and environment temperature.
5. a kind of diesel exhaust gas flow rate calculation side based on DPF post-processing control according to claim 1-4
Method, which is characterized in that the pressure difference signal at the measurement both ends DPF obtains second pressure of engine exhaust at a temperature of DPF upstream exhaust
Drop；First pressure drop, the second pressure drop and atmospheric environmental pressure sum to obtain upstream exhaust pressure.
6. a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control according to claim 5, feature
It is, according to DPF bed temperature, upstream exhaust pressure and exhaust mass flow, and is calculated based on the equation of gas state and flows through DPF
Exhaust volumetric flow.
7. a kind of diesel exhaust gas method of calculating flux based on DPF post-processing control according to claim 6, feature
It is, the DPF bed temperature is the weighted sum of DPF upstream and downstream end delivery temperature, and wherein weighting coefficient is dependent on row's temperature sensing
The installation site of device.
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| CN201811644838.9A CN109583140A (en) | 2018-12-29 | 2018-12-29 | A kind of diesel exhaust gas method of calculating flux based on DPF post-processing control |
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| CN201811644838.9A CN109583140A (en) | 2018-12-29 | 2018-12-29 | A kind of diesel exhaust gas method of calculating flux based on DPF post-processing control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823585A (en) * | 2019-11-06 | 2020-02-21 | 清华大学 | NO in heavy vehicle tail gas based on OBD remote emission monitoring dataXEmission factor acquisition method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1081347A1 (en) * | 1999-09-03 | 2001-03-07 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Method to determine the amount of diesel particulate accumulated in a DPF |
| CN102095551A (en) * | 2009-12-09 | 2011-06-15 | 通用汽车环球科技运作有限责任公司 | Method for determine gas pressure in an exhaust after-treatment system |
| CN104863679A (en) * | 2015-03-31 | 2015-08-26 | 凯龙高科技股份有限公司 | DPF system carbon loading capacity estimation and blocking state judgment method |
-
2018
- 2018-12-29 CN CN201811644838.9A patent/CN109583140A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1081347A1 (en) * | 1999-09-03 | 2001-03-07 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Method to determine the amount of diesel particulate accumulated in a DPF |
| CN102095551A (en) * | 2009-12-09 | 2011-06-15 | 通用汽车环球科技运作有限责任公司 | Method for determine gas pressure in an exhaust after-treatment system |
| CN104863679A (en) * | 2015-03-31 | 2015-08-26 | 凯龙高科技股份有限公司 | DPF system carbon loading capacity estimation and blocking state judgment method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823585A (en) * | 2019-11-06 | 2020-02-21 | 清华大学 | NO in heavy vehicle tail gas based on OBD remote emission monitoring dataXEmission factor acquisition method |
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Application publication date: 20190405 |