CN110131024A - A kind of leakage detection method and device of urea - Google Patents
A kind of leakage detection method and device of urea Download PDFInfo
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- CN110131024A CN110131024A CN201910630806.1A CN201910630806A CN110131024A CN 110131024 A CN110131024 A CN 110131024A CN 201910630806 A CN201910630806 A CN 201910630806A CN 110131024 A CN110131024 A CN 110131024A
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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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a kind of leakage detection methods of urea, it include: when the urea pump for detecting goal systems is in stable state under normal pressure setting value, the pressure value of the urea pump is increased to first pressure setting value, wherein, the first pressure setting value is greater than the normal pressure setting value；When the urea pump is in stable state under the first pressure setting value, the pressure value of the urea pump is reduced to second pressure setting value, wherein the second pressure setting value is less than the normal pressure setting value；After the completion of adjustment, the current pressure values and the sampled pressure value at corresponding time point for obtaining the goal systems determine whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value.Above-mentioned detection method does not need to increase additional detection device in system operation, so that it may which whether urea is revealed in detection system, waste caused by avoiding because of urea leakage.
Description
Technical field
The present invention relates to detection technique field more particularly to the leakage detection methods and device of a kind of urea.
Background technique
Since pipeline is there are coupling part, the urea being stored in pipeline easily causes leakage, such as selectively
Catalyst reduction system (SCR), SCR is a treatment process for NOx in exhaust gas from diesel vehicle discharge, i.e., in the effect of catalyst
Under, urea is sprayed into, the NOx in tail gas is reduced into N2 and H2O.The technology is also widely used for diesel engine vent gas post-processing,
By optimization oil spout and combustion process, the generation of particle PM is controlled as far as possible in machine, then the shape under off engine control technology excess oxygen
At nitrogen oxides, in time with urea for vehicle (urea for vehicle decomposes at a certain temperature generation ammonia) to nitrogen oxides (NOx) into
Row selective catalytic reduction, to achieve the purpose that not only energy conservation but also emission reduction.
But SCR is complex, leakage point is relatively more, it is more difficult to find, especially minor leakage does not influence urea and builds pressure
In the case of, the waste of urea is easily caused, a kind of detection method of urea leakage is lacked, to avoid wave caused by urea leakage
Take.
Summary of the invention
In view of this, the present invention provides the leakage detection method and device of a kind of urea, to solve caused by urea leakage
The problem of waste, concrete scheme are as follows:
A kind of leakage detection method of urea, comprising:
When the urea pump for detecting goal systems is in stable state under normal pressure setting value, by the pressure of the urea pump
Force value is increased to first pressure setting value, wherein the first pressure setting value is greater than the normal pressure setting value；
When the urea pump is in stable state under the first pressure setting value, the pressure value of the urea pump is reduced
To second pressure setting value, wherein the second pressure setting value is less than the normal pressure setting value；
After the completion of adjustment, the current pressure values and the sampled pressure value at corresponding time point of the goal systems are obtained, according to described in
Current pressure values and the sampled pressure value difference value, determine whether the goal systems leaks.
Above-mentioned method, optionally, further includes:
The urea pump is detected with the presence or absence of failure；
The failure of the urea pump is prompted if so, sending faulting instruction.
Above-mentioned method, optionally, further includes:
The current pressure values and the sampled pressure value are stored.
Above-mentioned method optionally after the completion of adjustment, obtains the current pressure values of the goal systems and corresponds to time point
Sampled pressure value determine whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value,
Include:
The sampled pressure value that preset first duration obtains urea pump described in the time point is spaced after obtaining the current pressure values；
Calculate the pressure difference value of the current pressure values Yu the sampled pressure value；
The pressure difference value is compared with preset threshold pressure difference, judges whether the pressure difference value is greater than preset pressure
Power difference threshold value；
If so, determining that the goal systems has leakage, or, there is no leakages if it is not, determining the goal systems.
Above-mentioned method optionally after the completion of adjustment, obtains the current pressure values of the goal systems and corresponds to time point
Sampled pressure value determine whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value,
Include:
It obtains and obtains the sampled pressure value at interval of preset second duration after the current pressure values；
When the total duration of the quantity of the sampled pressure value or interval meets corresponding threshold requirement, adjacent pressure value is calculated
Between pressure change rate and each pressure change rate mean pressure variations rate；
The mean pressure variations rate is compared with preset pressure change rate threshold value, judges the mean pressure variations rate
Whether preset pressure change rate threshold value is greater than；
If so, determining that the goal systems has leakage, or, there is no leakages if it is not, determining the goal systems.
A kind of leak detection apparatus of urea, comprising:
Module is improved, for inciting somebody to action when the urea pump for detecting goal systems is in stable state under normal pressure setting value
The pressure value of the urea pump is increased to first pressure setting value, wherein the first pressure setting value is greater than the positive normal pressure
Power setting value；
Module is reduced, when being used to be in stable state under the first pressure setting value when the urea pump, by the urea
The pressure value of pump is reduced to second pressure setting value, wherein the second pressure setting value is less than the normal pressure setting value；
Determining module is obtained, after the completion of adjusting, obtains the current pressure values of the goal systems and adopting for corresponding time point
Sample pressure value determines whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value.
Above-mentioned device, optionally, further includes:
Detection module, for detecting the urea pump with the presence or absence of failure；
Cue module, for prompting if so, sending faulting instruction the failure of the urea pump.
Above-mentioned device, optionally, further includes:
Memory module, for storing the current pressure values and the sampled pressure value.
Above-mentioned device, optionally, the acquisition determining module includes:
First acquisition unit is spaced preset first duration after the current pressure values and obtains urine described in the time point for obtaining
The sampled pressure value of element pump；
First computing unit, for calculating the pressure difference value of the current pressure values Yu the sampled pressure value；
First comparison judgment unit judges the pressure for the pressure difference value to be compared with preset threshold pressure difference
Whether power difference is greater than preset threshold pressure difference；
First judging unit, for if so, determining that the goal systems has leakage, or, if it is not, determining the goal systems not
There are leakages.
Above-mentioned device, optionally, the acquisition determining module includes:
Second acquisition unit obtains the sampled pressure at interval of preset second duration after the current pressure values for obtaining
Value；
Second computing unit, for meeting corresponding threshold requirement when the quantity of the sampled pressure value or the total duration at interval
When, calculate the mean pressure variations rate of pressure change rate and each pressure change rate between adjacent pressure value；
Second comparison judgment unit, for the mean pressure variations rate to be compared with preset pressure change rate threshold value,
Judge whether the mean pressure variations rate is greater than preset pressure change rate threshold value；
Second judging unit, for if so, determining that the goal systems has leakage, or, if it is not, determining the goal systems not
There are leakages.
Compared with prior art, the present invention includes the following advantages:
The invention discloses a kind of leakage detection methods of urea, comprising: when detecting the urea pump of goal systems in positive normal pressure
When being in stable state under power setting value, the pressure value of the urea pump is increased to first pressure setting value, wherein described the
One pressure set points are greater than the normal pressure setting value；Stablize when the urea pump is under the first pressure setting value
When state, the pressure value of the urea pump is reduced to second pressure setting value, wherein the second pressure setting value is less than institute
State normal pressure setting value；After the completion of adjustment, the current pressure values and the sampling pressure at corresponding time point of the goal systems are obtained
Force value determines whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value.Above-mentioned inspection
Survey method does not need to increase additional detection device, so that it may which whether urea is let out in detection system in system operation
Dew, waste caused by avoiding because of urea leakage.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of selective catalytic oxidation system structure diagram disclosed in the embodiment of the present application；
Fig. 2 is a kind of leakage detection method flow chart of urea disclosed in the embodiment of the present application；
Fig. 3 is a kind of flow chart according to the leakage of pressure difference detection urea disclosed in the embodiment of the present application；
Fig. 4 is a kind of pump pressure variation schematic diagram disclosed in the embodiment of the present application；
Fig. 5 is a kind of flow chart that urea leakage is detected according to pressure change rate disclosed in the embodiment of the present application；
Fig. 6 is a kind of leak detection apparatus structural block diagram of urea disclosed in the embodiment of the present application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
The invention discloses a kind of leakage detection method of urea and device, apply in urea leak detection process, this hair
It is illustrated by taking the urea leak detection process in SCR as an example in bright embodiment, wherein the entire block diagram of the work of SCR such as Fig. 1
Shown, exhaust gas flow enters oxidation catalyzer by exhaust pipe and is pre-processed, settling-discharging, is passing through diesel particulate filter
It is filtered, when entering in selective catalytic oxidation device, urea pump draws urea and pressurizeed from urea box, passes through
Pipeline is to urea nozzle, and at NH3, the NOx in NH3 and exhaust gas flow is carried out instead under the effect of the catalyst for hydrolysis of urea in pipe
N2 and H2O should be generated.Because easily urea is caused to reveal there are more piping connection part, therefore, mentioned in the embodiment of the present invention
Supplied a kind of leakage detection method of urea, the execution process of the detection method as shown in Fig. 2, comprising steps of
S101, when detecting the urea pump of goal systems under normal pressure setting value in stable state, by the urea
The pressure value of pump is increased to first pressure setting value, wherein the first pressure setting value is greater than the normal pressure setting value；
In the embodiment of the present invention, urea pump uses feedforward+closed loop control mode, wherein the normal pressure of the urea pump is set
Definite value be it is preset, the normal pressure setting value is the working pressure of urea pump under normal circumstances, wherein described
Normal pressure setting value can be modified by software, when the actual pressure value of the urea pump is set in the normal pressure
It is fluctuated in the fluctuation range of permission and lasting duration meets certain time length, determine the urea pump of the goal systems just
It is in stable state under normal pressure set points, the pressure value of the urea pump is increased to first pressure setting value, wherein described
First pressure setting value is greater than the normal pressure setting value, wherein for the fluctuation range of permission, certain time length and the first pressure
The setting of power setting value can empirically or concrete condition is set, to the fluctuation range of permission, certain in the present invention
The specific value of duration and the first pressure setting value is without limiting.
S102, when the urea pump under the first pressure setting value be in stable state when, by the urea pump
Pressure value is reduced to second pressure setting value, wherein the second pressure setting value is less than the normal pressure setting value；
In the embodiment of the present invention, the process whether urea pump is in stable state under the first pressure setting value is detected
Identical as the detection method of the stable state in normal pressure setting value, details are not described herein, if be in stable state, by institute
The pressure value for stating urea pump is reduced to second pressure setting value, wherein the second pressure setting value is less than the normal pressure
Setting value, wherein the second pressure setting value can empirically or concrete condition is set, in the embodiment of the present invention
The specific value of the second pressure setting value is not construed as limiting.
After the completion of S103, adjustment, the current pressure values and the sampled pressure value at corresponding time point of the goal systems are obtained,
According to the current pressure values and the sampled pressure value difference value, determine whether the goal systems leaks.
In the embodiment of the present invention, when the pressure value of the urea pump is reduced to the second pressure setting value, institute is obtained
State the current pressure values and the sampled pressure value at corresponding time point of goal systems, wherein the selection of the current point in time with adopt
The method whether the determination goal systems is revealed is related, according to the current pressure values and the sampled pressure value difference
Value, determines whether the goal systems leaks.
The invention discloses a kind of leakage detection methods of urea, comprising: when detecting the urea pump of goal systems just
When being in stable state under normal pressure set points, the pressure value of the urea pump is increased to first pressure setting value, wherein institute
First pressure setting value is stated greater than the normal pressure setting value；When the urea pump is under the first pressure setting value
When stable state, the pressure value of the urea pump is reduced to second pressure setting value, wherein the second pressure setting value is small
In the normal pressure setting value；After the completion of adjustment, the current pressure values of the goal systems and adopting for corresponding time point are obtained
Sample pressure value determines whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value.It is above-mentioned
Detection method do not need to increase additional detection device, so that it may which whether urea in detection system in system operation
Leakage, waste caused by avoiding because of urea leakage.
In the embodiment of the present invention, by judging that the pressure change of urea pump is detected, basic ideas are to stablize in pump pressure
To after normal pressure setting value (9bar), a biggish value (such as 10Bar) pressure is increased to first, be pumped in the setting
Value is again adjusted pump pressure to a lesser value (such as 7Bar), the purpose for the arrangement is that in order to which pressure is by larger after nearby stablizing
It is worth after smaller value switching, pressure change is more obvious, and initial pressure is higher is more obvious, and makees since the pressure closed loop of pump controls
With the pressure of pump can gradually decrease, and the trend for the transformation revealed there are urea and be pumped when revealing without urea is different.
In the embodiment of the present invention, when detecting the urea pump under normal pressure setting value in stable state, also
The urea pump be can detecte with the presence or absence of failure, the failure of the urea pump is prompted if so, sending faulting instruction, is tieed up
It repairs personnel and the urea pump is repaired according to the fault cues, it in this way can there are failures in the subsequent goal systems
When exclude to be caused by failure as the urea pump.
In the embodiment of the present invention, after the completion of adjustment, obtains the current pressure values of the goal systems and correspond to time point
Sampled pressure value determines what whether the goal systems leaked according to the current pressure values and the sampled pressure value difference value
Method flow as shown in figure 3, comprising steps of
S201, the sampling pressure that preset first duration obtains urea pump described in the time point is spaced after obtaining the current pressure values
Force value；
In the embodiment of the present invention, after obtaining the current pressure values, using timer counting starts, when reaching preset first
When long, the sampled pressure value of the urea pump is obtained at corresponding time point, wherein preset first duration can foundation
Experience or concrete condition are set, in the embodiment of the present invention, to the specific value of preset first duration without
It limits.
S202, the pressure difference value for calculating the current pressure values and the sampled pressure value；
In the embodiment of the present invention, the difference of the current pressure values Yu the sampled pressure value is calculated, pressure difference value is obtained.
S203, the pressure difference value is compared with preset threshold pressure difference, judges whether the pressure difference value is big
In preset threshold pressure difference；
In the embodiment of the present invention, the pressure difference value is compared with preset threshold pressure difference, judges the pressure difference value
Whether be greater than preset threshold pressure difference, wherein the preset threshold pressure difference can empirically or concrete condition into
Row setting, in the embodiment of the present invention, to the specific value of the preset threshold pressure difference without limiting.
S204, determine that the goal systems has leakage；
In the embodiment of the present invention, since the pressure closed loop of urea pump acts on, setting pressure is lower than actual pressure, and PI closed loop is substantially not
It works (output of PI closed loop is driving duty ratio, and duty ratio do not have negative value), pressure can decline rapidly, and when having urea leakage
Pressure decrease speed is fast when pressure decrease speed is less revealed.There is leakage in system and there is no when leakage, pump pressure becomes
The schematic diagram of change determines the goal systems as shown in figure 4, when the pressure difference value is greater than the preset threshold pressure difference
There are leakages.
S205, determining the goal systems, there is no leakages.
In the embodiment of the present invention, when the pressure difference value is less than the preset threshold pressure difference, the target is determined
There is no leakages for system.
In the embodiment of the present invention, after the completion of adjustment, obtains the current pressure values of the goal systems and correspond to time point
Sampled pressure value determines what whether the goal systems leaked according to the current pressure values and the sampled pressure value difference value
Method flow as shown in figure 5, comprising steps of
The sampled pressure value is obtained at interval of preset second duration after S301, the acquisition current pressure values；
In the embodiment of the present invention, it is spaced the preset second duration acquisition sampled pressure value after obtaining the current pressure values,
Wherein, preset second duration can empirically or concrete condition is set, in the embodiment of the present invention, to described
The specific value of preset second duration is without limiting.
S302, when the total duration of the quantity of the sampled pressure value or interval meets corresponding threshold requirement, calculate
The mean pressure variations rate of pressure change rate and each pressure change rate between adjacent pressure value；
In the embodiment of the present invention, at interval of described one sampled pressure value of preset second duration collection, when the sampled pressure
When the quantity of value or the total duration at interval reach corresponding threshold value, pressure change rate between adjacent pressure value, calculating side are calculated
Method is as shown in Equation (1):
(1)
Wherein,T moment sampled pressure value；
- t-1 instance sample pressure value；
Preset second duration；
Pressure change rate.
Calculate mean pressure variations rate corresponding with each pressure change rate.
S303, the mean pressure variations rate is compared with preset pressure change rate threshold value, is judged described average
Whether pressure change rate is greater than preset pressure change rate threshold value；
In the embodiment of the present invention, the mean pressure variations rate is compared with preset pressure change rate threshold value, judges institute
State whether mean pressure variations rate is greater than preset pressure change rate threshold value, wherein the preset pressure change rate threshold value can
With empirically or concrete condition is set, in the embodiment of the present invention, to the tool of the preset pressure change rate threshold value
Body numerical value is without limiting.
S304, determine that the goal systems has leakage；
It is above-mentioned according to the current pressure values and the sampled pressure value difference value in the embodiment of the present invention, determine the target
In the two kinds of implementations whether system leaks, call for convenience, it can be by the current pressure values and the sampled pressure
Value is stored, such as: the current pressure values and the sampled pressure value can be stored in specified data library.
In the embodiment of the present invention, since the pressure closed loop of urea pump acts on, setting pressure is lower than actual pressure, PI closed loop base
Originally do not work (output of PI closed loop does not have negative value for driving duty ratio, duty ratio), and pressure can decline rapidly, and have urea to let out
Pressure decrease speed is fast when pressure decrease speed is less revealed when dew.There is leakage in system and there is no when leakage, pumps
The schematic diagram of pressure change as shown in figure 4, when the mean pressure variations rate is greater than the preset pressure change rate threshold value,
Determine that the goal systems has leakage.
S305, determining the goal systems, there is no leakages.
In the embodiment of the present invention, when the mean pressure variations rate is less than the preset pressure change rate threshold value, sentence
There is no leakages for the fixed goal systems.
Based on above-mentioned urea leakage detection method, in the embodiment of the present invention, a kind of pressure change detection dress is additionally provided
It sets, the structural block diagram of the detection device is as shown in Figure 6, comprising:
Module 401 is improved, module 402 is reduced and obtains determining module 403.
Wherein:
The raising module 401, for stablizing shape when the urea pump for detecting goal systems is under normal pressure setting value
When state, the pressure value of the urea pump is increased to first pressure setting value, wherein the first pressure setting value is greater than described
Normal pressure setting value；
The reduction module 402, when being used to be in stable state under the first pressure setting value when the urea pump, by institute
The pressure value for stating urea pump is reduced to second pressure setting value, wherein the second pressure setting value is less than the normal pressure
Setting value；
The acquisition determining module 403 obtains the current pressure values of the goal systems and corresponds to the time after the completion of adjusting
The sampled pressure value of point determines whether the goal systems lets out according to the current pressure values and the sampled pressure value difference value
Leakage.
The invention discloses a kind of leak detection apparatus of urea, comprising: when detecting the urea pump of goal systems just
When being in stable state under normal pressure set points, the pressure value of the urea pump is increased to first pressure setting value, wherein institute
First pressure setting value is stated greater than the normal pressure setting value；When the urea pump is under the first pressure setting value
When stable state, the pressure value of the urea pump is reduced to second pressure setting value, wherein the second pressure setting value is small
In the normal pressure setting value；After the completion of adjustment, the current pressure values of the goal systems and adopting for corresponding time point are obtained
Sample pressure value determines whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value.It is above-mentioned
Detection device do not need to increase additional detection device, so that it may which whether urea in detection system in system operation
Leakage, waste caused by avoiding because of urea leakage.
In the embodiment of the present invention, the detection device further include:
Detection module and cue module.
Wherein:
The detection module, for detecting the urea pump with the presence or absence of failure；
The cue module, for prompting if so, sending faulting instruction the failure of the urea pump.
In the embodiment of the present invention, the detection device further include: memory module.
Wherein:
The memory module, for storing the current pressure values and the sampled pressure value.
In the embodiment of the present invention, the acquisition determining module 403 includes:
First acquisition unit, the first computing unit, the first comparison judgment unit and the first judging unit.
Wherein:
The first acquisition unit is spaced preset first duration after the current pressure values and obtains the time point institute for obtaining
State the sampled pressure value of urea pump；
First computing unit, for calculating the pressure difference value of the current pressure values Yu the sampled pressure value；
First comparison judgment unit judges institute for the pressure difference value to be compared with preset threshold pressure difference
State whether pressure difference value is greater than preset threshold pressure difference；
First judging unit, for if so, determining that the goal systems has leakage, or, if it is not, determining the target system
There is no leakages for system.
In the embodiment of the present invention, the acquisition determining module 403 includes:
Second acquisition unit, the second computing unit, the second comparison judgment unit and the second judging unit.
Wherein:
The second acquisition unit obtains the sampling at interval of preset second duration after the current pressure values for obtaining
Pressure value；
Second computing unit, for meeting corresponding threshold value when the quantity of the sampled pressure value or the total duration at interval
It is required that when, calculate the mean pressure variations rate of pressure change rate and each pressure change rate between adjacent pressure value；
Second comparison judgment unit, for comparing the mean pressure variations rate and preset pressure change rate threshold value
Compared with judging whether the mean pressure variations rate is greater than preset pressure change rate threshold value；
Second judging unit, for if so, determining that the goal systems has leakage, or, if it is not, determining the target system
There is no leakages for system.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
For convenience of description, it is divided into various units when description apparatus above with function to describe respectively.Certainly, implementing this
The function of each unit can be realized in the same or multiple software and or hardware when invention.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can
It realizes by means of software and necessary general hardware platform.Based on this understanding, technical solution of the present invention essence
On in other words the part that contributes to existing technology can be embodied in the form of software products, the computer software product
It can store in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that a computer equipment
(can be personal computer, server or the network equipment etc.) executes the certain of each embodiment or embodiment of the invention
Method described in part.
The leakage detection method and device of a kind of urea provided by the present invention are described in detail above, herein
Apply that a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to help
Understand method and its core concept of the invention；At the same time, for those skilled in the art, according to the thought of the present invention,
There will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as to this
The limitation of invention.
Claims (10)
1. a kind of leakage detection method of urea characterized by comprising
When the urea pump for detecting goal systems is in stable state under normal pressure setting value, by the pressure of the urea pump
Force value is increased to first pressure setting value, wherein the first pressure setting value is greater than the normal pressure setting value；
When the urea pump is in stable state under the first pressure setting value, the pressure value of the urea pump is reduced
To second pressure setting value, wherein the second pressure setting value is less than the normal pressure setting value；
After the completion of adjustment, the current pressure values and the sampled pressure value at corresponding time point of the goal systems are obtained, according to described in
Current pressure values and the sampled pressure value difference value, determine whether the goal systems leaks.
2. the method according to claim 1, wherein further include:
The urea pump is detected with the presence or absence of failure；
The failure of the urea pump is prompted if so, sending faulting instruction.
3. the method according to claim 1, wherein further include:
The current pressure values and the sampled pressure value are stored.
4. the method according to claim 1, wherein obtaining the current pressure of the goal systems after the completion of adjustment
The sampled pressure value of force value and corresponding time point, according to the current pressure values and the sampled pressure value difference value, described in determination
Whether goal systems leaks, comprising:
The sampled pressure value that preset first duration obtains urea pump described in the time point is spaced after obtaining the current pressure values；
Calculate the pressure difference value of the current pressure values Yu the sampled pressure value；
The pressure difference value is compared with preset threshold pressure difference, judges whether the pressure difference value is greater than preset pressure
Power difference threshold value；
If so, determining that the goal systems has leakage, or, there is no leakages if it is not, determining the goal systems.
5. the method according to claim 1, wherein obtaining the current pressure of the goal systems after the completion of adjustment
The sampled pressure value of force value and corresponding time point, according to the current pressure values and the sampled pressure value difference value, described in determination
Whether goal systems leaks, comprising:
It obtains and obtains the sampled pressure value at interval of preset second duration after the current pressure values；
When the total duration of the quantity of the sampled pressure value or interval meets corresponding threshold requirement, adjacent pressure value is calculated
Between pressure change rate and each pressure change rate mean pressure variations rate；
The mean pressure variations rate is compared with preset pressure change rate threshold value, judges the mean pressure variations rate
Whether preset pressure change rate threshold value is greater than；
If so, determining that the goal systems has leakage, or, there is no leakages if it is not, determining the goal systems.
6. a kind of leak detection apparatus of urea characterized by comprising
Module is improved, for inciting somebody to action when the urea pump for detecting goal systems is in stable state under normal pressure setting value
The pressure value of the urea pump is increased to first pressure setting value, wherein the first pressure setting value is greater than the positive normal pressure
Power setting value；
Module is reduced, when being used to be in stable state under the first pressure setting value when the urea pump, by the urea
The pressure value of pump is reduced to second pressure setting value, wherein the second pressure setting value is less than the normal pressure setting value；
Determining module is obtained, after the completion of adjusting, obtains the current pressure values of the goal systems and adopting for corresponding time point
Sample pressure value determines whether the goal systems leaks according to the current pressure values and the sampled pressure value difference value.
7. device according to claim 6, which is characterized in that further include:
Detection module, for detecting the urea pump with the presence or absence of failure；
Cue module, for prompting if so, sending faulting instruction the failure of the urea pump.
8. device according to claim 6, which is characterized in that further include:
Memory module, for storing the current pressure values and the sampled pressure value.
9. device according to claim 6, which is characterized in that the acquisition determining module includes:
First acquisition unit is spaced preset first duration after the current pressure values and obtains urine described in the time point for obtaining
The sampled pressure value of element pump；
First computing unit, for calculating the pressure difference value of the current pressure values Yu the sampled pressure value；
First comparison judgment unit judges the pressure for the pressure difference value to be compared with preset threshold pressure difference
Whether power difference is greater than preset threshold pressure difference；
First judging unit, for if so, determining that the goal systems has leakage, or, if it is not, determining the goal systems not
There are leakages.
10. device according to claim 6, which is characterized in that the acquisition determining module includes:
Second acquisition unit obtains the sampled pressure at interval of preset second duration after the current pressure values for obtaining
Value；
Second computing unit, for meeting corresponding threshold requirement when the quantity of the sampled pressure value or the total duration at interval
When, calculate the mean pressure variations rate of pressure change rate and each pressure change rate between adjacent pressure value；
Second comparison judgment unit, for the mean pressure variations rate to be compared with preset pressure change rate threshold value,
Judge whether the mean pressure variations rate is greater than preset pressure change rate threshold value；
Second judging unit, for if so, determining that the goal systems has leakage, or, if it is not, determining the goal systems not
There are leakages.
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