CN103557063B - A kind of detection method and device of urea injection system failure - Google Patents
A kind of detection method and device of urea injection system failure Download PDFInfo
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- CN103557063B CN103557063B CN201310468716.XA CN201310468716A CN103557063B CN 103557063 B CN103557063 B CN 103557063B CN 201310468716 A CN201310468716 A CN 201310468716A CN 103557063 B CN103557063 B CN 103557063B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The invention provides a kind of detection method and device of urea injection system failure.The detection method includes, and determines that the working condition of urea pump is normal；Actual urea injection index is obtained, the urea injection index is the expression that urea injection system sprays urea amount；Judge that the actual urea injection index and theoretical urea spray the difference of index whether in the range of predictive error, if not, determining urea injection system failure.Detection method and device that the urea injection system provided by the present invention fails, be capable of detecting when due to injecting-unit connecting line caused by there was a mechanical failure spraying system fail, so as to find mechanical breakdown in time, the exhaust emissions index of engine can be better controled over.
Description
Technical field
The present invention relates to the detection side of engine exhaust emission technical field, more particularly to a kind of failure of urea injection system
Method and device.
Background technology
SCR（Selective Catalytic Reduction）Technology is to eliminate the master of nitrogen oxides in diesel exhaust gas
Want one of post-processing technology.Control unit, urea dosage device and the part of catalytic reaction unit three are broadly divided into according to function；Its
Middle urea dosage device according to whether there is air-assisted injection can be divided into gas help formula urea injection system and non-gas help formula urea spray
System.
In existing air auxiliary urea injection system, it sometimes appear that SCR urea pump working conditions are intact, auxiliary is empty
Atmospheric pressure is normal, and the related CAN communication parameter that urea injection needs is normally received, but the situation that emission result is deteriorated.Analysis
It was found that be usually to occur what mechanical breakdown was caused by urea injection system part connecting line, such as urea imbibition conduit failure, such as
High temperature melting, connector installs insecure leakage or urea box liquid outlet blocks and causes urea pump not penetrate enough pump as desired
Urea liquid.There is this mechanical breakdown, urea injection system can not be detected, and this is resulted under such a failure mode
Uncontrollable engine nitrogen oxygen discharge.
The content of the invention
In view of this, the invention provides a kind of detection method and device of urea injection system failure, to realize to urine
Whether plain spraying system part connecting line occurs the detection of mechanical breakdown.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
A kind of detection method of urea injection system failure, including,
Determine that the working condition of urea pump is normal；
Actual urea injection index is obtained, the urea injection index is the expression that urea injection system sprays urea amount；
Judge that the actual urea injection index and theoretical urea spray the difference of index whether in the range of predictive error,
If not, determining urea injection system failure.
More preferably, the urea injection index includes, the urea injecting quantity of urea pump discharge.
More preferably, the theoretical urea injection index includes theoretical urea injecting quantity, the theoretical urea injecting quantity be by
Electronic control unit ECU is according to nitrous oxides concentration and waste gas stream in engine speed, circulation fuel injection amount, engine emission
What amount was calculated.
More preferably, the urea injection index includes, actual urea injection pressure of the urea pump under predetermined work frequency.
More preferably, the urea injection index includes, under predetermined operating mode, nitrogen of the engine after urea pump sprays urea
Oxygen discharge capacity.
More preferably, the theoretical urea injection index is included under predetermined operating mode, and engine is after urea pump injection urea
Theoretical nitrogen oxygen discharge capacity；The engine is under the theoretical nitrogen oxygen discharge capacity and the predetermined operating mode after urea pump sprays urea
Theoretical urea injecting quantity, the raw emissions of engine and oxynitrides transformation efficiency it is relevant.
A kind of detection means of urea injection system failure, including,
First determining unit, for determining that urea pump is in normal injection state；
Acquiring unit, for obtaining actual urea injection index；
Judging unit, for judging the actual urea injection index with the difference of theoretical urea injection index whether pre-
Determine in error range；
Second determining unit, for spraying index with the difference of theoretical urea injection index not pre- when the actual urea
Determine in error range, determine that urea injection system fails.
More preferably, the urea injection index includes, the urea injecting quantity of urea pump discharge.
More preferably, the urea injection index includes, under predetermined operating mode, reality of the urea pump under predetermined work frequency
Urea sprays pressure.
More preferably, the urea injection index includes, under predetermined operating mode, nitrogen of the engine after urea pump sprays urea
Oxygen discharge capacity.
The detection method and device for the urea injection system failure that the present invention is provided, it is first determined urea pump is in normal
Working condition, then the actual urea of multilevel iudge urea injection system, which sprays index and the difference of theoretical urea injection index, is
It is no in the range of predictive error, if its difference is not within the predefined range, that is, can determine that the ejection section in urea injection system
Part occurs in that mechanical breakdown, urea injection system failure.The detection side that the urea injection system provided by the present invention fails
Method and device, be capable of detecting when due to injecting-unit connecting line caused by there was a mechanical failure spraying system fail so that
Mechanical breakdown can be found in time, can better control over the exhaust emissions index of engine.
Brief description of the drawings
In order to the technical scheme of the embodiment of the present invention is expressly understood, it will be used below when describing embodiment
Accompanying drawing is briefly described.It should be evident that drawings in the following description are some embodiments of the present invention, it is common for this area
For technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is SCR urea injection system schematic diagrames；
Fig. 2 is the detection method schematic flow sheet of the embodiment of the present invention one；
Fig. 3 is the operation principle schematic diagram of SCR system；
Fig. 4 is the detection means schematic diagram of the embodiment of the present invention two.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
SCR urea injection systems shown in Fig. 1 include engine electronic control unit ECU01, SCR controller DCU02, two
Person is realized by CAN and communicated.Wherein, the signal that SCR controllers DCU02 is sent according to ECU controls whole urea to spray
Process.In the SCR urea injection systems, include urea box 03, urea supply unit 04, the urea injection list of storage urea
Member 05.
Operation principle is as follows：The signal that SCR controllers DCU02 is sent according to ECU01 control urea supply unit 04 by
Urea is supplied to urea injection unit 05 according to demand urea amount, then urea sprays through urea injection unit 05.The urine of ejection
Element reacts with the oxynitrides in the raw emissions of engine 06 in SCR catalytic mufflers 07, so that partial discharge
Oxynitrides reduction generation nitrogen in thing, so as to reach the purpose of the discharge capacity of reduction oxynitrides.In this process
In, SCR controllers DCU02 can monitor urea level and temperature in urea box 03, control urea supply unit 04 to urea
The urea amount that injection unit 05 is provided.SCR controllers DCU02 can also monitor the emission of the raw emissions of engine 07
The content of temperature and the oxynitrides after SCR catalytic mufflers 07.
It should be noted that the row of the engine when raw emissions of described engine are without SCR catalytic mufflers
Put, i.e., the discharge of engine when not with urea reaction.
Understood in SCR urea injection systems from the above description, DCU02 can monitor urea box 03, urea supply unit
04 and urea injection unit working condition it is whether intact, but can not monitor whether the connecting line of each injecting-unit goes out
Existing mechanical breakdown.Such as when urea imbibition conduit failure, or the liquid outlet blocking of urea box causes urea supply unit to obtain
The urea injecting quantity of demand, and then cause the urea amount that urea pump is ejected less than the urea injecting quantity of demand.
It is whether intact in order to each connecting line for detecting spraying system, i.e., with the presence or absence of mechanical breakdown, the present invention
Embodiment one provides the detection method that a kind of urea injection system fails.
Embodiment one
Fig. 2 is the detection method schematic flow sheet of the urea injection system failure of the embodiment of the present invention one.
S201, judge whether the working condition of urea pump is normal：
Specifically, by detecting that whether normal the CAN of urea injection system communicates, whether assist air pressure is normal
Etc., so as to judge that whether intact the working condition of urea pump is normal.If it is determined that the working condition of urea pump is normal, step is performed
Rapid S202.
S202, the actual urea injection index of acquisition：
It should be noted that the urea injection index described in the present embodiment is the table that urea injection system sprays urea amount
Show.Specifically, urea injection index can be the urea injecting quantity under predetermined operating mode, or urea pump is in predetermined work
Urea injection pressure under working frequency, can also be nitrogen oxygen row of the engine after urea pump sprays urea under predetermined operating mode
High-volume.Nitrogen oxygen discharge capacity and theoretical urea injecting quantity predetermined operating mode under of the engine after urea pump sprays urea, start
The raw emissions of machine and the transformation efficiency of oxynitrides are relevant.Theoretical urea injecting quantity under the predetermined operating mode is by electricity
Sub-control unit ECU is according to nitrous oxides concentration and exhaust gas flow in engine speed, circulation fuel injection amount, engine emission
Calculate.It is pointed out that described urea injection index includes but is not limited to specific targets described above.Ability
Domain those of ordinary skill according to actual needs or monitoring convenience, other urea injection indexs can also be obtained.
Specifically, when urea injection index is the urea injecting quantity under predetermined operating mode, actual urea injection index is obtained,
It is specifically as follows：Obtain the actual urea injecting quantity in urea pump exit.
When it is that urea of the urea pump under predetermined work frequency sprays pressure that urea, which sprays index, actual urea spray is obtained
Index is penetrated, is specifically as follows：Got and urinated under predetermined work frequency by pressure sensor measurement in the exit of urea pump
Actual urea injection pressure at plain pump discharge.
Those skilled in the art know, under different working frequencies, and the urea injection pressure in urea pump exit is different,
It is therefore desirable to which the urea injection pressure for clearly knowing measurement is the urea injection pressure under what kind of working frequency.
When urea injection index be under predetermined operating mode, engine urea pump spray urea after nitrogen oxygen discharge capacity when,
Actual urea injection index is obtained, is specifically as follows：Actual nitrogen oxygen discharge capacity of the engine after urea pump sprays urea is obtained,
That is, obtaining residual nitrogen oxygen discharge capacity of the raw emissions of engine after SCR catalytic mufflers and urea reaction.
S203, judge the actual urea injection index with the difference of theoretical urea injection index whether in predictive error model
In enclosing：
It should be noted that in the present embodiment, theoretical urea injection index is stored in advance in urea injection system
's.
The actual urea injection index for comparing acquisition sprays the difference of index with theoretical urea, and judge the difference whether
In the range of predictive error.Described predictive error can be the error of technical staff's rule of thumb defined.Because due to
The reason for mechanism of spraying system, it is possible to cause actual urea injection index and theoretical urea injection index not quite identical,
That is, actual urea injection index and theoretical urea index may be caused not quite identical due to systematic error, so,
It can specify that when actual urea injection index and theoretical urea spray index in certain error range, it is believed that be to receive
's.
In order to be more clearly understood that the present embodiment, the urea that index is specially urea pump exit is sprayed urea below and is sprayed
The urea of the amount of penetrating, urea pump under predetermined work frequency sprays pressure and under predetermined operating mode, and engine sprays in urea pump
Described one by one during nitrogen oxygen discharge capacity after urea.
First, when urea injection index is the urea injecting quantity under predetermined operating mode：
The actual urea injecting quantity under predetermined operating mode for comparing acquisition sprays with the theoretical urea under the predetermined operating mode
The difference of amount, and the difference is judged whether in the range of predictive error, if it is, performing step S205, this shows that the urea sprays
Penetrate system working properly, be not at failure state.Otherwise, then step S204 is performed.
It should be noted that the theoretical urea injecting quantity under predetermined operating mode is stored in advance in urea injection system.
And as described above theoretical urea injecting quantity be by electronic control unit ECU according to engine speed, circulation fuel injection amount, start
Nitrous oxides concentration and exhaust gas flow are calculated in machine discharge.So, when the timing of operating mode one, calculate obtained theoretical urea
Emitted dose is also certain.
When it is that urea of the urea pump under predetermined work frequency sprays pressure that urea, which sprays index,：
As described above, measuring actual urea of the urea pump in exit using pressure sensor sprays pressure, due to urea
Spray pressure related to the working frequency of urea pump, so, need to measure the urea injection under certain working frequency in measurement
Pressure.When spraying different media due to urea pump, the pressure in urea pump exit is different.If in SCR system urea pipe
Damage or urea box is blocked, the air contained in the medium that can cause urea pump injection is compared to the air contained under normal circumstances
It is more, pressure when can so cause the actual pressure now sprayed less than normal injection.So, by detecting urea pump discharge
The pressure at place can interpolate that the connecting line of the injecting-unit of SCR urea injection systems, and whether there was a mechanical failure.So as to
The reason for urea pump can not eject enough urea is diagnosed to be in time.
The actual urea injection pressure of multilevel iudge and theoretical urea spray the difference of pressure whether in the range of predictive error,
If it is, performing step S205, this shows, the connecting line of the injecting-unit of the SCR urea injection systems is without mechanical breakdown, such as
It is really no, then perform step S204.
When urea injection index is that under predetermined operating mode, engine is in the nitrogen oxygen discharge capacity after urea pump sprays urea：
In SCR urea injection systems, the urea ejected by urea pump can react with the oxynitrides of discharge,
So as to reach the purpose for the discharge capacity for reducing oxynitrides.Concrete principle is as follows：
Exhaust after booster turbine outflow from blast pipe is entered, while by the urea injection unit on blast pipe
Quantitative aqueous solution of urea is sprayed into blast pipe with mist form, urea droplets issue unboiled water solution and heat in high-temp waste gas effect
Solution reaction, the reducing agent ammonia required for generation（NH3）, ammonia（NH3）By nitrogen oxides in the presence of catalyst（NOx）Have
Optionally it is reduced to nitrogen（N2）, react schematic diagram as shown in Figure 3.Sometimes for preventing excessive ammonia（NH3）Escape is caused
Secondary pollution, in addition it is also necessary to set at SCR catalyst rear and promote ammonia（NH3）It is oxidized to nitrogen（N2）Catalyst.
The molecular formula NH of urea2CONH2, plus H2NH is resolved into after O at high temperature3And CO2, this reaction do not need catalytic condition
It can complete：
NH2CONH2+H2O→2NH3+CO2（1）
NH in SCR catalyst3With NO, NO in exhaust2Reaction produces N2And H2O：
2NO+2NO2+4NH3→3N2+6H2O （2）
4NO+O2+4NH3→4N2+6H2O （3）
2NO2+O2+4NH3→3N2+6H2O （4）
To prevent the leakage of ammonia during the whole service life of engine, it is sometimes desirable to set and disappear after SCR catalyst
Except the catalyst converter of ammonia, the NH in this catalyst converter3With O2Reaction generation N2And H2O：
4NH3+3O2→2N2+6H2O
From principles above, in the case where theoretical urea injecting quantity and transformation efficiency are certain, remaining oxynitrides
Discharge capacity reflect to a certain extent actual urea pump injection urea amount number.
In order to which multilevel iudge is under predetermined operating mode, actual nitrogen oxygen discharge capacity and reason of the engine after urea pump sprays urea
By the size of nitrogen oxygen discharge capacity, it is necessary to know theoretical nitrogen oxygen discharge capacity of the engine after urea pump sprays urea.Obtain pre-
Determine under operating mode, the method for theoretical nitrogen oxygen discharge capacity of the engine after urea pump sprays urea is specific as follows：
First, the original nitrogen oxygen discharge of the theoretical urea injecting quantity and theoretical engine under predetermined operating mode is obtained；
It should be noted that the original nitrogen oxygen discharge of the theoretical urea injecting quantity and theoretical engine under the predetermined operating mode is
It is stored in advance in urea injection control unit.
Then, according to the temperature and exhaust gas flow of theoretical urea injecting quantity and the emission under predetermined operating mode, calculate
The transformation efficiency of oxynitrides；
Then, the transformation efficiency with oxynitrides is discharged according to the original nitrogen oxygen of theoretical engine, calculates theory
Residual nitrogen oxygen discharge capacity；
By measure obtain under predetermined operating mode, actual nitrogen oxygen discharge of the engine after urea pump sprays urea with it is theoretical
Nitrogen oxygen discharge capacity is compared, and judges its difference whether in the range of predictive error, if it is, performing step S205.This table
Bright, the connecting line of the injecting-unit of SCR system injection urea system is intact, no mechanical breakdown, if it is not, then performing step
S204。
S204, determine urea injection system fail.
S205, urea injection system working condition are normal.
The detection method for the urea injection system failure that embodiment one is provided sprays index and reason by relatively actual urea
The difference for spraying index by urea is capable of detecting when the failure that injecting-unit connecting line occurs.This is just to be diagnosed to be discharge in time
Not up to standard the reason for, provides help.Due to lacking the diagnosis for the mechanical breakdown for detecting injecting-unit connecting line in the prior art
Method, so, the also perfect diagnostic function of the urea injection system of SCR system of the prior art of the detection method can
Mechanical breakdown is detected in time, discharges so as to better control over engine nitrogen oxygen and reminds human pilot to repair event in time in time
Barrier.
The detection method of urea injection system failure based on above-described embodiment one, present invention also offers a kind of spray of urea
Penetrate the detection means of thrashing.Referring particularly to embodiment two.
Embodiment two
Referring to Fig. 4, Fig. 4 is the detection means of the urea injection system failure of embodiment two.The detection means includes,
First determining unit 41, for determining that urea pump is in normal injection state；
Acquiring unit 42, for obtaining actual urea injection index；
Judging unit 43, for judge the actual urea injection index and theoretical urea injection index difference whether
In the range of predictive error；
Second determining unit 44, for not existing when the difference of the actual urea injection index and theoretical urea injection index
In the range of predictive error, determine that urea injection system fails.
Further, the urea injection index includes the urea injecting quantity of urea pump discharge.
Further, the urea injection index includes, under predetermined operating mode, reality of the urea pump under predetermined work frequency
Border urea injection pressure.
Further, the urea injection index includes, under predetermined operating mode, and engine is after urea pump injection urea
Nitrogen oxygen discharge capacity.
The function of unit described above, effect are corresponding with the function in embodiment of the method one, effect.In order to brief
For the sake of, it is not described in detail herein, specifically refers to the description of embodiment of the method one.
Described above is only presently preferred embodiments of the present invention, not makees any formal limitation to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.Any those skilled in the art,
Without departing from the scope of the technical proposal of the invention, all using the methods and techniques content of the disclosure above to the technology of the present invention
Scheme makes many possible variations and modification, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from this hair
The content of bright technical scheme, the technical spirit according to the present invention is to any simple modification made for any of the above embodiments, equivalent variations
And modification, still fall within technical solution of the present invention protection in the range of.
Claims (3)
1. a kind of detection method of urea injection system failure, it is characterised in that including,
Determine that urea pump is in normal injection state；
Actual urea injection pressure of the urea pump in exit is obtained as actual urea and sprays index, the urea sprays index
It is the expression that urea injection system sprays urea amount；The urea injection index is urea of the urea pump under predetermined work frequency
Spray pressure；
Judge that the actual urea injection index and theoretical urea spray the difference of index whether in the range of predictive error, if
It is no, determine the connecting line failure of the injecting-unit of urea injection system.
2. detection method according to claim 1, it is characterised in that the theoretical urea injection index includes theoretical urea
Emitted dose, the theoretical urea injecting quantity is according to engine speed, circulation fuel injection amount, hair by electronic control unit ECU
Nitrous oxides concentration and exhaust gas flow are calculated in motivation discharge.
3. a kind of detection means of urea injection system failure, it is characterised in that including,
First determining unit, for determining that urea pump is in normal injection state；
Acquiring unit, index is sprayed for obtaining actual urea injection pressure of the urea pump in exit as actual urea；
Judging unit, for judging the actual urea injection index with the difference of theoretical urea injection index whether in predetermined mistake
In poor scope；The urea injection index is urea injection pressure of the urea pump under predetermined work frequency；
Second determining unit, for not making a reservation for mistake when the difference of the actual urea injection index and theoretical urea injection index
In poor scope, the connecting line failure of the injecting-unit of urea injection system is determined.
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| CN106837485A (en) * | 2016-12-26 | 2017-06-13 | 潍柴动力空气净化科技有限公司 | The test device and its method of SCR spraying system steady state controling precisions |
| CN107178493B (en) * | 2017-06-22 | 2020-10-09 | 北京一雄信息科技有限公司 | Urea pump detecting system |
| CN108386256B (en) * | 2018-04-26 | 2023-08-18 | 潍柴动力股份有限公司 | Device and method for detecting failure of urea injection pipeline |
| CN110778385B (en) * | 2019-09-25 | 2020-10-30 | 潍柴动力股份有限公司 | Method and device for detecting leakage of urea injection system on line |
| CN110863890A (en) * | 2019-10-09 | 2020-03-06 | 华东交通大学 | Method for remotely diagnosing reasonability of urea consumption of diesel vehicle SCR system |
| CN114810289A (en) * | 2021-06-10 | 2022-07-29 | 长城汽车股份有限公司 | Method and device for detecting state of SCR system, electronic equipment and vehicle |
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| JP2009156159A (en) * | 2007-12-26 | 2009-07-16 | Toyota Motor Corp | Device for determining abnormal section of exhaust emission control system |
| JP5534602B2 (en) * | 2009-11-06 | 2014-07-02 | ボッシュ株式会社 | Abnormality detection device and abnormality detection method for reducing agent injection valve |
| US9234447B2 (en) * | 2010-12-10 | 2016-01-12 | GM Global Technology Operations LLC | System and method for determining selective catalytic reduction dosing system performance using an ammonia sensor |
| CN103046989B (en) * | 2012-12-11 | 2014-12-10 | 潍柴动力股份有限公司 | Plug-and-play urea spraying control method and system |
| CN103277175B (en) * | 2013-06-08 | 2015-06-17 | 潍柴动力股份有限公司 | Reducing agent nozzle state detection method and device and catalytic reduction system |
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