CN109869217A - Nozzle blockage diagnostic system and method for aqueous solution of urea spraying system - Google Patents
Nozzle blockage diagnostic system and method for aqueous solution of urea spraying system Download PDFInfo
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- CN109869217A CN109869217A CN201711265801.0A CN201711265801A CN109869217A CN 109869217 A CN109869217 A CN 109869217A CN 201711265801 A CN201711265801 A CN 201711265801A CN 109869217 A CN109869217 A CN 109869217A
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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
This application provides a kind of nozzle blockage diagnostic systems and method for aqueous solution of urea spraying system, wherein the aqueous solution of urea spraying system includes fluid reservoir, nozzle, and the pump connected between the fluid reservoir and the nozzle via fluid circuit, the nozzle blockage diagnostic system includes sensor module for detecting the Fluid pressure in the fluid circuit and the pressure detection value for sensor module described in reception and analysis and the control module that is controlled the pump, the control module can control the pump startup n times so that the nozzle pumpback, wherein n is integer and >=1, for each pumpback process of nozzle, in a predetermined time interval, sensor module detects the pressure value in the fluid circuit, and the pressure value detected is integrated by the control module and obtains an integral Value, the control module judge whether the nozzle blocks and/or the degree of congestion of the nozzle based on n integrated value being achieved in that.
Description
Technical field
This application involves in the aqueous solution of urea spraying system employed in diesel vehicle nozzle blockage diagnostic system and side
Method.
Background technique
For environmental grounds, selective catalytic reduction (SCR) system is widely used in diesel vehicle at present to engine exhaust
It is handled.SCR system mainly includes aqueous solution of urea spraying system, and foundation needs to spray urea water into the exhaust pipe of engine
Solution, to do harmless treatment to the oxynitrides in engine exhaust and the external world is discharged.
Aqueous solution of urea spraying system is used for a long time, and remains in the urea in nozzle after each nozzle injection aqueous solution of urea
Aqueous solution can crystallize, and this crystallization can stopped nozzles；Or if aqueous solution of urea itself contains impurity, after extended residual
This impurity will also result in nozzle blockage.The nozzle of obstruction will be unable to spray the desired amount of aqueous solution of urea, cause engine useless
Gas discharge is exceeded.
The prior art is only able to detect the nozzle situation after blocking completely mostly.If obstruction takes place in nozzle
When be just able to carry out corresponding detection or this obstruction that just has the ability to anticipate before nozzle will block completely if, will
Warning can be provided for the user of diesel vehicle, so as to carry out respective handling, such as replacement or washer jet etc. in advance, avoided
Engine exhaust emission is exceeded.
Summary of the invention
The application is directed to the nozzle blockage diagnostic system used in a kind of aqueous solution of urea spraying system and method, from
And the degree of congestion of delivery nozzle can be judged before nozzle blocks completely.
According to the one aspect of the application, a kind of nozzle blockage diagnosis system for aqueous solution of urea spraying system is provided
System, wherein the aqueous solution of urea spraying system include fluid reservoir, nozzle and via fluid circuit in the fluid reservoir and institute
The pump connected between nozzle is stated, the nozzle blockage diagnostic system includes for detecting the Fluid pressure in the fluid circuit
Sensor module and the pressure detection value for sensor module described in reception and analysis and control that the pump is controlled
Molding block, the control module can control the pump startup n times so that the nozzle pumpback, and wherein n is integer and >=1,
For each pumpback process of the nozzle, in a predetermined time interval, the sensor module detects the fluid hose
Pressure value in road, and the pressure value detected is integrated by the control module and obtains an integrated value, the control
Module judges whether the nozzle blocks and/or the degree of congestion of the nozzle based on n integrated value being achieved in that.
According to further aspect of the application, additionally provides a kind of nozzle blockage for aqueous solution of urea spraying system and examine
Disconnected method.The described method includes: control the pump startup n times so that the nozzle pumpback, wherein n is integer and >=1, and
The fluid in the fluid circuit is detected in a predetermined time interval for each pumpback process of the nozzle (300)
Pressure, and pressure detection value is integrated and obtains an integrated value；The nozzle is judged based on n integrated value being achieved in that whether
The degree of congestion of obstruction and/or the nozzle.
Using the above-mentioned technological means of the application, under the premise of not changing existing urea aqueous solution injection system configuration,
It can judge to relative quantification that whether nozzle blocks and degree of congestion, provides early warning for the user of diesel vehicle, avoids
Engine exhaust emission is exceeded, and provides the foundation of replacement or washer jet.
Detailed description of the invention
The aforementioned and other side of the application will be more fully understood from aftermentioned detailed description and in conjunction with following attached drawing
Face.It should be pointed out that the ratio of each attached drawing is possible to different for clearly explained purpose, but this will not influence to this
The understanding of application.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the system block diagram of aqueous solution of urea spraying system used in diesel vehicle；
Fig. 2 be schematically illustrated in aqueous solution of urea spraying system nozzle it is unobstructed in the case where pumpback nozzle when urea water
Pressue-graph and correlation product component in the pipeline of solution spraying system；
Urine when pumpback nozzle in the case that the nozzle that Fig. 3 is schematically illustrated in aqueous solution of urea spraying system blocks completely
Pressue-graph and correlation product component in the pipeline of plain aqueous solution spraying system；And
Fig. 4 diagrammatically illustrates the flow chart of the nozzle blockage diagnostic method according to the application one embodiment.
Specific embodiment
In each attached drawing of the application, structure is identical or intimate feature is indicated by the same numbers.
Fig. 1 diagrammatically illustrates the system block diagram of aqueous solution of urea spraying system used in diesel vehicle.Urea is water-soluble
Liquid spraying system generally includes fluid reservoir 100 for storing aqueous solution of urea, nozzle 300 and in the fluid reservoir 100
The pump 200 being connected between the nozzle 300 via fluid circuit.Pump 200 for through fluid circuit by aqueous solution of urea from storage
Flow container 100 is pumped into nozzle 300, to spray into the exhaust pipe of engine of (not shown) diesel vehicle selectively controlledly
Aqueous solution of urea.
After nozzle 300 completes an aqueous solution of urea course of injection, 200 meeting reverse starting of pump, so that stream
In body pipeline and/or nozzle 300 in remaining aqueous solution of urea pumpback to fluid reservoir 100.Finally, nozzle 300 is communicated with the atmosphere.
Therefore, during above-mentioned pumpback, if nozzle 300 unobstructed (not blocking), in pumpback fluid hose after a certain period of time
Pressure in road should be consistent with atmospheric pressure；If nozzle 300 by partial blockage or it is even completely blocking if, pumpback is certain
It is still negative pressure in fluid circuit after time.
In order to nozzle 300 congestion situations carry out Quantitative Diagnosis to for user provide further replacement and/or clearly
The prompt of nozzle 300 is washed, the nozzle blockage diagnostic system of the application generally includes sensor module 400 and control module
500.For example, sensor module 400 can be the fluid pressure sensor of any suitable type well known to those skilled in the art,
As shown in Figure 1, being arranged on the fluid circuit of aqueous solution of urea spraying system, for detecting the Fluid pressure feelings in fluid circuit
Condition.Control module 500 is connected with pump 200 and 400 data of sensor module, pumps 200 operation and from sensor die for controlling
Block 400 receives the pressure measurement data in fluid circuit.Control module 500 includes computer.For example, control module 500 can be with
It is the electronic control unit (ECU) of diesel vehicle.
For the fluid circuit of aqueous solution of urea spraying system as shown in Figure 1, the nozzle blockage diagnostic system of the application
The case where having detected unobstructed nozzle and complete stopped nozzles respectively, testing result indicates in figs 2 and 3 respectively.In Fig. 2 and 3
In, abscissa indicates time (unit；Second), left ordinate indicates pressure (unit: hundred pa of hPa/), and right ordinate indicates pressure
It integrates (unit: hundred Pa Secs of hPas/).In figs 2 and 3, curve 1 and 2 represents the observed pressure result in fluid circuit.
When pumping 200 positive operation, aqueous solution of urea is sucked into nozzle 300 from fluid reservoir 100, therefore in fluid circuit
Pressure value be positive.With 200 inverted runnings are pumped, remaining aqueous solution of urea is by pumpback in nozzle 300 and/or fluid circuit
To fluid reservoir 100, in the process, the pressure value in fluid circuit at least starts to be negative.That is, when in fluid circuit
Pressure value when being negative from rotating forward, also mean that pump 200 starts to carry out pumpback to nozzle 300.It can be seen that from Fig. 2 and 3
Moment t0, the pressure in fluid circuit reach zero.The case where for nozzles clear (Fig. 2), since moment t0, in fluid circuit
Negative pressure absolute value first progressively reach a maximum value, it is water-soluble then as remaining urea in nozzle 300 and/or fluid circuit
Liquid is evacuated, and will be communicated with atmosphere inside nozzle 300 and/or fluid circuit, and the pressure at therefore fluid circuit both ends is equal
Reach big Fluid pressure, so that the pressure absolute value in fluid circuit is close to zero.However, the feelings blocked completely for nozzle
Condition (Fig. 3), the negative pressure value in fluid circuit first progressively reaches a value, although then in nozzle 300 and/or fluid circuit
Remaining aqueous solution of urea is evacuated, but because the obstruction of nozzle 300 is fluid circuit both ends can still have pressure difference, also
It is to say, if continuing to carry out nozzle 300 pumpback, the negative pressure value in fluid circuit will maintain constant near certain value.This
Field technical staff is it should be clear that the degree of congestion of nozzle 300 should be with the maintained value size phase of negative pressure in fluid circuit
It closes.
Therefore, inventor's discovery is analyzed by the negative pressure value in fluid pipe road, can quantitatively diagnose nozzle 300
Whether block and/or substantially understand degree of congestion.For this purpose, being directed to the pressure curve of Fig. 2 and 3, integrated respectively.Integral is opened
Before moment beginning is the pumpback downtime or the pumpback downtime that t0, finish time t1, such as t1 can be pump 200
The a certain moment.Curve 11 and 22 in Fig. 2 and 3 respectively represents associated quad curve obtained.
From Fig. 2 and 3 as can be seen that the case where for nozzles clear, integral curve 11 close to straight line and slope it is small, this with return
It is corresponding that the pressure value in later period fluid circuit, which is taken out, close to zero；The case where blocking completely for nozzle, integral curve 22
Close to straight line and slope it is big, this with the negative pressure value in pumpback later period fluid circuit close to it is constant be corresponding.In Fig. 2, when
T1 is carved, integral curve 11 reaches value -7880.89, and in Fig. 3, in moment t1, integral curve 22 reaches value -53571.72.
As can be seen that can be carried out to the congestion situations of nozzle 300 by integrated value of the evaluation pressure curve in stipulated time section
Diagnosis.
Fig. 4 diagrammatically illustrates the flow chart of the nozzle blockage diagnostic method according to the application one embodiment.This field
Technical staff is it should be clear that the nozzle blockage diagnostic system according to the application can be used for executing this method.
As shown in figure 4, firstly, starting to be diagnosed in step S5.In step S10, starting pump 200, to nozzle 300 into
Row pumpback.In the context of this application, term " pumpback " refers to bearing by the generation in fluid circuit that acts on of pump 200
Pressure, so that it is guaranteed that any fluid in nozzle 300 and/or fluid circuit can only be back to along from nozzle 300 through fluid circuit
The direction of fluid reservoir 100 is mobile.Pump 200 can be configured to, and no matter whether nozzle 300 blocks, and the duration of each pumpback can
Be it is fixed, such as 1 minute.In step S15, urea water is detected using the sensor module 400 of nozzle blockage diagnostic system
Pressure in (such as between pump 200 and nozzle 300) fluid circuit of solution spraying system.For example, pressure detection value can be with
It is sent to control module 500 further storage and calculating.In step S20, to pressure detection value obtained as defined in one
Integral calculation is carried out in time interval and obtains an integrated value.It is opened for example, the time interval can be the t0 shown in Fig. 2 and 3
Begin to t1 to terminate.Preferably, which is less than or equal to the duration of each pumpback.In step S30, judge to spray
Whether mouth 300 carries out the number of pumpback more than n, wherein and n is integer greater than 1, preferably 10.If the judgement knot of step S30
Fruit be it is no, then go to step S10, wait starting pump 200 next time, pumpback is carried out to nozzle 300.If the judgement of step S30
As a result be it is yes, then go to step S40, obtained at this point, n should have been obtained and carried out integral calculation to pressure detection value obtained
The integrated value arrived；It averages to n integrated value.Then, in step S50, whether judgment step S40 average value obtained reaches
To a scheduled limit value.If the judging result of step S50 be it is yes, go to step S60, to the user of diesel vehicle issue warn
Report reminds user to prepare replacement and/or washer jet 300.If the judging result of step S50 be it is no, go to step
S70 terminates diagnosis, and waits and restart to be diagnosed next time.
In above-mentioned steps S40, it can take absolute value to the average value of integrated value.In this case, in step S40
Limit value can be a positive value, in step s 50, judge whether the absolute value of the average value is greater than the limit value.In addition, ability
Field technique personnel should understand in addition to other than step S40 averages to each integrated value, can also be to the absolute of each integrated value
Value summation or other corresponding calculating.In addition, in an alternative embodiment, the limit value in step S50 is also possible to change
, such as in the presence of successively multiple and different limit value from small to large, as step S40 average value obtained reaches different limits
Value, to assert that nozzle 300 reaches different degree of congestion.
Although specific implementations of the present application are 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 scope of the present application.In addition, it will be apparent to those skilled in the art that this explanation
Each embodiment described in book can be applied in combination each other.It is various under the premise of not departing from the application spirit and scope
Replacement, change and transformation can be contemplated out.
Claims (14)
1. a kind of nozzle blockage diagnostic system for aqueous solution of urea spraying system, wherein the aqueous solution of urea spraying system
Including fluid reservoir (100), nozzle (300) and via fluid circuit the fluid reservoir (100) and the nozzle (300) it
Between the pump (200) that connects, the nozzle blockage diagnostic system includes the biography for detecting the Fluid pressure in the fluid circuit
Sensor module (400) and for sensor module (400) described in reception and analysis pressure detection value and to the pump (200)
The control module (500) controlled, which is characterized in that the control module can control the pump (200) starting n times so that
Nozzle (300) pumpback is obtained, wherein n is that integer and >=1 make a reservation for for each pumpback process of the nozzle (300) one
Time interval in, the sensor module (400) detects the pressure value in the fluid circuit, and the pressure value detected
It is integrated by the control module (500) and obtains an integrated value,
The control module (500) judged based on n integrated value being achieved in that the nozzle (300) whether block and/or
The degree of congestion of the nozzle (300).
2. nozzle blockage diagnostic system according to claim 1, which is characterized in that the control module (500) is based on n
Whether the average value of integrated value blocks judging the nozzle (300) and/or the degree of congestion of the nozzle (300).
3. nozzle blockage diagnostic system according to claim 1 or 2, which is characterized in that if the average value of n integrated value
Absolute value be more than value as defined in one, then the control module (500) assert that the nozzle (300) has obstruction；And/or it is described
The degree of congestion of nozzle (300) is related to the absolute value of average value of the n integrated value.
4. nozzle blockage diagnostic system according to claim 1 or 2, which is characterized in that if the sum of n integrated value is exhausted
To value more than one as defined in be worth, then there is obstruction in the control module (500) the identification nozzle (300)；And/or the nozzle
(300) degree of congestion and the n integrated value and absolute value it is related.
5. nozzle blockage diagnostic system according to claim 1 or 2, which is characterized in that at the beginning of the time interval
At the time of carving (t0) and be defined as each pumpback process and start, and the finish time (t1) of the time interval is defined as returning every time
At the time of being pumped through journey terminates.
6. nozzle blockage diagnostic system according to claim 5, which is characterized in that the start time (t0) is defined as institute
It states at the time of the pressure in fluid circuit reaches zero for the first time and/or the finish time (t1) is defined as each pumpback process knot
A moment before beam.
7. nozzle blockage diagnostic system according to claim 1 or 2, which is characterized in that n=10.
8. a kind of nozzle blockage diagnostic method for aqueous solution of urea spraying system, wherein the aqueous solution of urea spraying system
Including fluid reservoir (100), nozzle (300) and via fluid circuit the fluid reservoir (100) and the nozzle (300) it
Between the pump (200) that connects, which comprises
Pump (200) the starting n times are controlled so that the nozzle (300) pumpback, wherein n is integer and >=1, and is directed to institute
The each pumpback process for stating nozzle (300) detects the Fluid pressure in the fluid circuit in a predetermined time interval,
And pressure detection value is integrated and obtains an integrated value；
Judge whether the nozzle (300) blocks and/or the resistance of the nozzle (300) based on n integrated value being achieved in that
Plug degree.
9. nozzle blockage diagnostic method according to claim 8, which is characterized in that the average value based on n integrated value come
Judge whether the nozzle (300) blocks and/or the degree of congestion of the nozzle (300).
10. nozzle blockage diagnostic method according to claim 8 or claim 9, which is characterized in that if n integrated value is averaged
The absolute value of value is more than value as defined in one, then assert that the nozzle (300) has obstruction；And/or the obstruction of the nozzle (300)
Degree is related to the absolute value of average value of the n integrated value.
11. nozzle blockage diagnostic method according to claim 8 or claim 9, which is characterized in that if the sum of n integrated value
Absolute value is more than value as defined in one, then assert that the nozzle (300) has obstruction；And/or the degree of congestion of the nozzle (300)
To the n integrated value and absolute value it is related.
12. nozzle blockage diagnostic method according to claim 8 or claim 9, which is characterized in that at the beginning of the time interval
At the time of carving (t0) and be defined as each pumpback process and start, and the finish time (t1) of the time interval is defined as returning every time
At the time of being pumped through journey terminates.
13. nozzle blockage diagnostic method according to claim 12, which is characterized in that the start time (t0) is defined as
At the time of pressure in the fluid circuit reaches zero for the first time and/or the finish time (t1) is defined as each pumpback process
A moment before end.
14. nozzle blockage diagnostic method according to claim 8 or claim 9, which is characterized in that n=10.
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Cited By (3)
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| CN111894714A (en) * | 2020-08-10 | 2020-11-06 | 上海星融汽车科技有限公司 | Blockage detection method and system for liquid inlet filter of SCR system and vehicle |
| CN113250797A (en) * | 2021-04-29 | 2021-08-13 | 广西玉柴机器股份有限公司 | Method and device for diagnosing urea solution consumption deviation process |
| CN114687839A (en) * | 2022-03-18 | 2022-07-01 | 潍柴动力股份有限公司 | Urea liquid level clamping stagnation determining method and device and vehicle |
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| CN111894714A (en) * | 2020-08-10 | 2020-11-06 | 上海星融汽车科技有限公司 | Blockage detection method and system for liquid inlet filter of SCR system and vehicle |
| CN113250797A (en) * | 2021-04-29 | 2021-08-13 | 广西玉柴机器股份有限公司 | Method and device for diagnosing urea solution consumption deviation process |
| CN113250797B (en) * | 2021-04-29 | 2022-07-15 | 广西玉柴机器股份有限公司 | Method and device for diagnosing urea solution consumption deviation process |
| CN114687839A (en) * | 2022-03-18 | 2022-07-01 | 潍柴动力股份有限公司 | Urea liquid level clamping stagnation determining method and device and vehicle |
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| Publication number | Publication date |
|---|---|
| CN109869217B (en) | 2022-04-15 |
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