CN116838459A - Method, device, equipment and storage medium for judging crystallization degree of mixer - Google Patents
Method, device, equipment and storage medium for judging crystallization degree of mixer Download PDFInfo
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- CN116838459A CN116838459A CN202310796620.XA CN202310796620A CN116838459A CN 116838459 A CN116838459 A CN 116838459A CN 202310796620 A CN202310796620 A CN 202310796620A CN 116838459 A CN116838459 A CN 116838459A
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- 238000002425 crystallisation Methods 0.000 title claims abstract description 170
- 230000008025 crystallization Effects 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 42
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 170
- 239000004202 carbamide Substances 0.000 claims abstract description 170
- 238000002347 injection Methods 0.000 claims abstract description 149
- 239000007924 injection Substances 0.000 claims abstract description 149
- 239000013078 crystal Substances 0.000 claims description 20
- 238000002474 experimental method Methods 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 10
- 230000008030 elimination Effects 0.000 abstract description 7
- 238000003379 elimination reaction Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 78
- 238000012545 processing Methods 0.000 description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 238000010531 catalytic reduction reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
-
- 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]
-
- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides a method, a device, equipment and a storage medium for judging the crystallization degree of a mixer, wherein the method comprises the following steps: acquiring the flow rate of the exhaust gas input into a mixer, the temperature of the mixer and the injection quantity of urea injected into the mixer; increasing a timing time when the urea injection amount is not less than a urea injection amount threshold, the urea injection amount threshold being derived using the exhaust gas flow rate and the temperature; reducing the timing time when the temperature is greater than a preset temperature and the urea injection amount of the mixer is less than a preset urea injection amount, the preset urea injection amount being obtained using the urea injection amount threshold; and obtaining a crystallization degree judgment result of the mixer by using the timing time. The application provides a method for judging the crystallization degree of a mixer, which reduces the risk of exceeding the standard of vehicle emission by prompting the crystallization elimination of the detection result of the crystallization degree of the mixer.
Description
Technical Field
The application relates to the technical field of tail gas treatment, in particular to a method, a device, equipment and a storage medium for judging the crystallization degree of a mixer.
Background
With the continuous development of technology, more and more vehicles are used in every corner in life, and with the increase of vehicles, a lot of environmental protection problems are brought, so that the SCR system is generated for solving the environmental protection problems brought by the vehicles.
A selective catalytic reduction system (Selective Catalytic Reduction, SCR) is a system for treating exhaust gas from an engine, and the SCR system decomposes nitrogen oxides in the exhaust gas from the engine into nitrogen and water by performing selective catalytic reduction on the exhaust gas from the engine, thereby reducing the emission of nitrogen oxides from the engine and preventing the nitrogen oxides from polluting the environment. The SCR system has the working principle that urea is sprayed into the exhaust gas discharged by an engine, and then the urea and nitrogen oxides in the exhaust gas are subjected to chemical reaction under the action of a catalyst to generate nitrogen and water
The mixer is an important component in the SCR system, and is mainly used for promoting the pyrolysis and the hydrolysis of urea and improving the conversion efficiency of the SCR system to nitrogen oxides. The mixer in the SCR system can generate crystallization after being used for a period of time, and the crystallization can influence the normal operation of the mixer, and finally, the emission exceeds standard, so that the environmental problem is caused.
The prior art does not have a method for judging the crystallization degree in the mixer, and therefore, how to judge the crystallization degree in the mixer is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
Based on the above problems, the application provides a method, a device, equipment and a storage medium for judging the crystallization degree of a mixer, so as to solve the problem that the crystallization degree in the mixer cannot be judged in the prior art.
The application provides a method for judging the crystallization degree of a mixer, which comprises the following steps:
acquiring the flow rate of the exhaust gas input into a mixer, the temperature of the mixer and the injection quantity of urea injected into the mixer;
increasing a timing time when the urea injection amount is not less than a urea injection amount threshold, the urea injection amount threshold being derived using the exhaust gas flow rate and the temperature;
reducing the timing time when the temperature is greater than a preset temperature and the urea injection amount of the mixer is less than a preset urea injection amount, the preset urea injection amount being obtained using the urea injection amount threshold;
and obtaining a crystallization degree judgment result of the mixer by using the timing time.
Alternatively, the urea injection quantity threshold may be obtained by:
inputting the exhaust gas flow into the mixer at the temperature and continuously injecting urea into the mixer;
stopping the urea injection to the mixer when crystals are generated in the mixer, and taking the total amount of urea injected to the mixer as the urea injection amount threshold.
Optionally, the method for judging the crystallization degree of the mixer further includes:
acquiring a plurality of different exhaust gas flows and a plurality of different temperatures, respectively taking the plurality of different exhaust gas flows as target exhaust gas flows and the plurality of different temperatures as target temperatures;
inputting the target exhaust gas flow rate into a mixer at the target temperature and continuously injecting urea into the mixer;
stopping urea injection to the mixer when crystallization occurs in the mixer, and taking the urea injection quantity injected to the mixer as a urea injection quantity threshold value at a target exhaust gas flow rate and a target temperature.
Optionally, the obtaining the crystallization degree judgment result of the mixer by using the timing time includes:
when the timing time is smaller than a first time threshold value, determining that the crystallization degree judgment result of the mixer is free of crystallization risk;
when the timing time is greater than or equal to a first time threshold and less than a second time threshold, determining the crystallization degree judgment result of the mixer as a low crystallization risk;
when the timing time is greater than or equal to a second time threshold and less than a third time threshold, determining the crystallization degree judgment result of the mixer as a medium crystallization risk;
and when the timing time is greater than or equal to a third time threshold, determining the crystallization degree judgment result of the mixer as high crystallization risk.
The application also provides a device for judging the crystallization degree of the mixer, which comprises the following modules:
an acquisition module for acquiring an exhaust gas flow rate input to a mixer, a temperature of the mixer, and an injection amount of urea injected to the mixer;
the timing time increasing module is used for increasing the timing time when the urea injection quantity is not smaller than a urea injection quantity threshold value, and the urea injection quantity threshold value is obtained by utilizing the exhaust gas flow and the temperature;
a timing time reduction module, configured to reduce the timing time when the temperature is greater than a preset temperature and the urea injection amount of the mixer is less than a preset urea injection amount, where the preset urea injection amount is obtained by using the urea injection amount threshold;
and the crystallization degree judging module is used for obtaining a crystallization degree judging result of the mixer by utilizing the timing time.
Optionally, the urea injection quantity threshold value is obtained through the following modules:
a mixer experiment module for inputting the exhaust gas flow into the mixer at the temperature and continuously injecting urea into the mixer;
and the urea injection quantity threshold determining module is used for stopping the urea injection to the mixer when crystallization is generated in the mixer, and taking the total quantity of the urea injected to the mixer as the urea injection quantity threshold.
Optionally, the device for judging the crystallization degree of the mixer further includes:
the experimental data acquisition module is used for acquiring a plurality of different exhaust gas flows and a plurality of different temperatures, wherein the plurality of different exhaust gas flows are respectively used as target exhaust gas flows, and the plurality of different temperatures are respectively used as target temperatures;
the mixer target condition experiment module is used for inputting the target exhaust gas flow into the mixer at the target temperature and continuously injecting urea into the mixer;
and the target urea injection quantity threshold determining module is used for stopping urea injection to the mixer when crystallization is generated in the mixer, and taking the urea injection quantity injected to the mixer as a urea injection quantity threshold at a target exhaust gas flow and a target temperature.
Optionally, the crystallization degree judging module includes:
a crystallization risk-free determining unit configured to determine that a crystallization degree judgment result of the mixer is crystallization risk-free when the timing time is less than a first time threshold;
a low crystallization risk determining unit, configured to determine a crystallization degree determination result of the mixer as a low crystallization risk when the timing time is greater than or equal to a first time threshold and less than a second time threshold;
a medium crystallization risk determining unit, configured to determine a crystallization degree judgment result of the mixer as a medium crystallization risk when the timing time is greater than or equal to a second time threshold and less than a third time threshold;
and the high crystallization risk determining unit is used for determining the crystallization degree judging result of the mixer as high crystallization risk when the timing time is greater than or equal to a third time threshold value.
The application also provides an electronic device comprising a processor and a memory:
the memory is used for storing a computer program and transmitting the computer program to the processor;
the processor is used for executing the steps of the method for judging the crystallization degree of the mixer according to the instructions in the computer program.
The application also provides a computer readable storage medium, which is characterized in that the computer readable storage medium is used for storing a computer program, and the computer program realizes the steps of the method for judging the crystallization degree of the mixer when being executed by electronic equipment.
Compared with the prior art, the application has the following beneficial effects:
the application judges the crystallization degree of the mixer by acquiring the exhaust gas flow rate of the mixer, the temperature of the mixer and the urea injection quantity injected to the mixer in combination with the timing time. In the method provided by the application, the urea injection quantity threshold value is set, the urea injection quantity threshold value is obtained by utilizing the flow and the temperature of the waste gas, different flow and temperature correspond to different urea injection quantity threshold values, whether different mixers generate crystallization under different working conditions is judged by setting the urea injection quantity threshold value, and whether the mixers generate crystallization is reflected by timing time. In addition, the application also considers the situation of eliminating the crystallization in the mixer, sets corresponding conditions to reduce the timing time, thereby representing the elimination of the crystallization in the mixer, and finally obtains the crystallization degree judgment result of the mixer through the timing time. The application provides a method for accurately judging the crystallization degree of a mixer.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining the crystallization degree of a mixer according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a device for determining crystallization degree of a mixer according to an embodiment of the present application.
Detailed Description
As described above, a selective catalytic reduction system (Selective Catalytic Reduction, SCR) is a system that processes exhaust gases from an engine, and a mixer is an important component of an SCR system. The more crystals in the mixer, the weaker the treatment effect of the SCR system on the exhaust gas, and when the crystals in the mixer reach a certain level, the problem of emissions exceeding the standard is caused.
It has been found that the prior art has a method of eliminating crystals in a mixer. Since the degree of crystallization in the mixer cannot be judged, it is also impossible to accurately judge when the crystallization in the mixer is eliminated. If the problem of exceeding discharge is considered, crystals are not present in the mixer or only a small amount of crystals are present, so that the cost is high, and resource waste is caused; if cost considerations are considered, the longer the vehicle will take to eliminate crystals in the mixer, the emissions will often exceed the standard before crystals in the mixer are eliminated. The prior art does not have a method for judging the crystallization degree in the mixer, and if the crystallization degree in the mixer can be judged and a prompt is sent, the crystallization in the mixer can be eliminated at the most proper time, so that the cost is saved, and the problem of exceeding emission standard can be avoided.
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments that a person of ordinary skill in the art could obtain without making any inventive effort are within the scope of the present application.
It will be appreciated that the method provided by the application can be applied to a processing device, which is a processing device capable of acquiring the exhaust gas flow, the temperature and the urea injection quantity, for example, a terminal device or a server capable of acquiring the exhaust gas flow, the temperature and the urea injection quantity. The method provided by the application can be independently executed through the terminal equipment or the server, can also be applied to a network scene of communication between the terminal equipment and the server, and is executed through the cooperation of the terminal equipment and the server. The terminal equipment can be a computer, a mobile phone and other equipment. The server can be understood as an application server or a Web server, and can be an independent server or a cluster server in actual deployment.
Fig. 1 is a flowchart of a method for determining the crystallization degree of a mixer, which includes the following steps:
s101: the flow rate of the exhaust gas inputted into the mixer, the temperature of the mixer, and the urea injection amount injected into the mixer are obtained.
The treatment device obtains an exhaust gas flow rate input to the mixer, a temperature of the mixer, and an injection amount of urea injected to the mixer. The exhaust gas flow rate input to the mixer, the temperature of the mixer and the urea injection amount injected to the mixer may be generally obtained in the ECU of the vehicle.
An electronic controller unit (Electronic Control Unit, ECU), also known as the brain of the vehicle, is used to control the driving state of the vehicle. The method mainly uses data acquisition and exchange of various sensors and buses to judge the state of the vehicle and controls the automobile through an actuator.
The ECU can control the operation of the SCR system, and the terminal equipment can acquire data such as the flow rate of the exhaust gas inputted into the mixer, the temperature of the mixer, the injection amount of urea injected into the mixer, and the like from the ECU.
In S101, the flow rate of the exhaust gas from the mixer, the temperature of the mixer, and the amount of urea injected into the mixer are all real-time data during actual running of the vehicle.
S102: and increasing the timing time when the urea injection quantity is not less than the urea injection quantity threshold value.
The processing device can judge whether the urea injection quantity is not smaller than the urea injection quantity threshold in real time, and when the urea injection quantity is not smaller than the urea injection quantity threshold, the timing time is increased.
The urea injection quantity threshold value is obtained by using the exhaust gas flow rate and the temperature, and has a corresponding relation with the exhaust gas flow rate and the temperature.
In one possible implementation, the ECU obtains an exhaust gas flow rate of 500 and a temperature of 300 degrees at a time when the vehicle is running, and the urea injection amount threshold at this time corresponds to the exhaust gas flow rates of 500 and 300 degrees. The urea injection quantity threshold at this time may be determined experimentally in advance.
For example, a crystallization boundary experiment will be performed on an engine and SCR system of a vehicle, with the crystallization boundary experiment being conditioned to exhaust gas flow rates of 500 and 300 degrees. The mixer in the SCR system was heated to 300 degrees and urea was sprayed onto the mixer under such conditions using the exhaust gas flow from the engine at 500 degrees until crystallization occurred in the mixer. The urea injection into the mixer is stopped when crystals are produced in the mixer. The state in which crystallization is to be generated without generating crystallization in the mixer is called a crystallization boundary of the mixer. When crystallization occurs in the mixer, the urea injection into the mixer is stopped, and the total amount of urea injected into the mixer is used as a urea injection amount threshold value when the exhaust gas flow rate is 500 and 300 degrees.
The time-counting time is used to indicate the time for crystal formation in the mixer, and when the urea injection amount is not less than the urea injection amount threshold, this means that crystals have been formed, and the time-counting time is increased.
Because the exhaust gas flow, the temperature of the mixer and the urea injection quantity injected into the mixer correspond to a certain moment, in one possible implementation, the processing device determines that the urea injection quantity is greater than a urea injection quantity threshold corresponding to the moment when the vehicle runs for one hour, and the timing time begins to increase; the processing device judges that the urea injection amount is smaller than the urea injection amount threshold corresponding to the moment when the vehicle runs for one hour and fifteen minutes, the processing device does not judge that the urea injection amount is smaller than the urea injection amount threshold at any moment within the period from one hour to fifteen minutes, and the timing time is increased by fifteen minutes.
S103: and reducing the timing time when the temperature is greater than the preset temperature and the urea injection quantity of the mixer is less than the preset urea injection quantity.
In addition to the crystallization, the interior of the mixer eliminates certain crystallization during the running of the vehicle under certain conditions. The certain temperature is a condition for eliminating internal crystals of the mixer, and the preset temperature may be a temperature at which internal crystals of the mixer are initially eliminated, which is determined in conjunction with actual running of the vehicle. The preset temperature may be 350 degrees, 375 degrees, 400 degrees, etc., and is typically selected to be 350 degrees.
Another condition affecting the internal crystallisation elimination of the mixer is the urea injection quantity, it being understood that although the internal part of the mixer satisfies the temperature conditions of crystallisation elimination, the continuous injection of urea into the internal part of the mixer will also produce a continuous crystallisation with a rate greater than the rate of crystallisation elimination, which is generally also reflected in crystallisation but not crystallisation elimination. In this case, the processing device determines whether the urea injection amount is smaller than a preset urea injection amount, which may be obtained using the urea injection amount threshold at this time, in addition to determining the temperature. In one possible implementation, the preset urea injection amount may be 0.8 times the urea injection amount threshold at this time.
And reducing the timing time when the processing equipment judges that the temperature is higher than the preset temperature and the urea injection quantity of the mixer is smaller than the preset urea injection quantity until the processing equipment judges that the conditions are not met.
S104: and obtaining a crystallization degree judgment result of the mixer by using the timing time.
The time counting time can reflect the crystallization degree in the mixer, and the processing equipment obtains the crystallization degree judgment result of the mixer by using the time counting time.
The time threshold may be set in connection with the actual situation, and the degree of crystallization in the mixer may be represented by comparing the timed time with the time threshold.
In one possible implementation manner, the first time threshold may be set for 20 hours, the processing device identifies the relationship between the timing time and the first time threshold in real time, when the timing time is smaller than the first time threshold, it may be understood that there is crystallization in the mixer, but the crystallization does not have any influence on the actual operation of the mixer, that is, there is no crystallization risk, for example, the processing device determines that the timing time is 8 hours and 8 hours are smaller than 20 hours at a certain moment, and then the processing device may determine that the crystallization degree determination result of the mixer is no crystallization risk.
In addition to setting the first time threshold, a second time threshold may be set, for example, 35 hours may be set as the second time threshold, when the timing time is greater than or equal to the first time threshold and less than the second time threshold, it may be understood that a certain amount of crystals have been generated in the mixer, and the crystallization starts to affect the actual operation of the mixer, that is, the risk of crystallization is low, for example, at a certain moment, the processing device determines that the timing time is 25 hours, 25 hours is greater than 20 hours and less than 35 hours, and at this moment, the processing device may determine the result of determining the degree of crystallization of the mixer as the risk of crystallization is low.
In addition to setting the first time threshold and the second time threshold, a third time threshold may be set, for example, 50 hours may be set as the third time threshold, when the timing time is greater than or equal to the second time threshold and less than the third time threshold, it may be understood that more crystals have been generated in the mixer, and the crystallization has affected the actual operation of the mixer to some extent, that is, the risk of middle crystallization, for example, at a certain moment, the processing device determines that the timing time is 40 hours, 40 hours is greater than 35 hours and less than 50 hours, and at this moment, the processing device may determine the result of determining the crystallization degree of the mixer as the risk of middle crystallization.
When the time is greater than or equal to the third time threshold, it may be understood that a large amount of crystals have been generated in the mixer, and the crystals have greatly affected the actual operation of the mixer, that is, the risk of high crystals, for example, the processing device determines that the time is 60 hours, 60 hours are greater than 50 hours at a certain time, and then the processing device may determine the result of determining the degree of crystallization of the mixer as the risk of high crystals.
In one possible implementation, the timing time may be embodied by a timer, such that the timing time may be observed by the driver in real time. The corresponding crystallization risk can be displayed through the indicator lamp, for example, the indicator lamp is not in a non-crystallization risk state when the indicator lamp is not on, the green indicator lamp represents the low crystallization risk, the yellow indicator lamp represents the medium crystallization risk, and the red indicator lamp represents the high crystallization risk.
The method provided by the application judges the crystallization degree of the mixer by acquiring the exhaust gas flow rate of the mixer input into the vehicle, the temperature of the mixer and the urea injection quantity injected to the mixer in combination with the timing time in actual use. In the method provided by the application, the urea injection quantity threshold value is set, the urea injection quantity threshold value is obtained by utilizing the flow and the temperature of the waste gas, different flow and temperature correspond to different urea injection quantity threshold values, whether different mixers generate crystallization under different working conditions is judged by setting the urea injection quantity threshold value, and whether the mixers generate crystallization is reflected by timing time. In addition, the application also considers the situation of eliminating the crystallization in the mixer, sets corresponding conditions to reduce the timing time, thereby representing the elimination of the crystallization in the mixer, and finally obtains the crystallization degree judgment result of the mixer through the timing time. The application provides a method for accurately judging the crystallization degree of a mixer. The method provided by the application can directly acquire the data in the ECU, and the crystallization degree in the mixer is reflected by utilizing the timing time, so that no other elements are needed to be added to the vehicle, the vehicle is not required to be greatly changed, and the method is easy to realize. The method provided by the application also specifically determines the crystallization risk in the mixer through comparing the timing time with the time threshold, thereby more specifically displaying the crystallization risk degree, facilitating the observation of a driver and better judging when to clean the crystallization in the mixer.
In addition to the implementation of determining the urea injection quantity threshold value in real time during the driving of the vehicle, the urea injection quantity threshold value which may occur during the driving of the vehicle may also be predetermined, in one possible implementation a plurality of different exhaust gas flows and a plurality of different temperatures may be acquired.
A plurality of different exhaust gas flows may occur during actual travel of the plurality of different exhaust gas flows. For example, the exhaust gas flow rate of the vehicle during actual driving may range from 200 to 2500, and the plurality of different exhaust gas flows may be any of a plurality of different exhaust gas flows between 200 and 2500; the temperature of the mixer during actual driving of the vehicle may range from 180 to 500. The plurality of different temperatures is then any of a plurality of different temperatures between 180-500.
The target exhaust gas flow rate may be determined first, for example, 200 as the target exhaust gas flow rate, by using the plurality of different exhaust gas flow rates as the target exhaust gas flow rates, and the urea injection amount threshold values of the target exhaust gas flow rate 200 at the plurality of different mixer temperatures may be determined by the crystallization boundary experiment provided in S102, respectively. For example, the plurality of different temperatures are 180, 200, 220, 240, &..times.500. The respective urea injection quantity thresholds for the exhaust gas flow 200 at these temperatures are determined experimentally. In the case of exhaust gas flow determination, there is a functional relationship between temperature and urea injection threshold, from which the urea injection threshold at any temperature at exhaust gas flow 200 can be determined. After determining the urea injection amount thresholds at different temperatures corresponding to the exhaust gas flow 200, the above operations may be repeated with 220 as the target exhaust gas flow to obtain urea injection amount thresholds at different temperatures corresponding to the exhaust gas flow 220, and repeating the above methods to obtain urea injection amount thresholds at different temperatures corresponding to the exhaust gas flow 200, 220, 240, 260, & gt, 2500. After that, a target temperature may be determined, for example, 300 as the target temperature, and urea injection amount thresholds of the target temperature 300 at a plurality of different exhaust gas flows may be determined by the crystallization boundary experiments provided in S102, respectively. For example, a number of different exhaust gas flows are 200, 220, 240, and 2500. The respective urea injection quantity thresholds for the temperature 300 at these exhaust gas flows are determined experimentally. In the case of temperature determination, there is likewise a functional relationship between the exhaust gas flow and the urea injection quantity threshold value, by means of which the urea injection quantity threshold value corresponding to any exhaust gas flow at the temperature 300 can be determined. The urea injection amount threshold corresponding to any combination of the mixer in the temperature range and the exhaust gas flow range can be obtained by comprehensively using the two methods, for example, the urea injection amount threshold of the exhaust gas flow 568 at the temperature 289 can be determined by comprehensively using the two methods.
And storing the results of the crystallization boundary experiment in a vehicle, and directly determining the urea injection quantity threshold value corresponding to the exhaust gas flow rate and the temperature based on the results of the crystallization boundary experiment after the processing equipment acquires the exhaust gas flow rate input into the mixer and the temperature of the mixer.
According to the method provided by the application, the urea injection quantity threshold corresponding to any exhaust gas flow and temperature in the working exhaust gas flow range and the temperature range of the mixer is determined through experiments performed in advance, so that the judgment time for increasing or reducing the timing time is shortened, the judgment on the crystallization degree in the mixer is more accurate, and the calculation load of a vehicle is reduced due to the fact that real-time calculation is avoided.
The application also provides a structural schematic diagram of a device for judging the crystallization degree of the mixer shown in fig. 2, wherein the device 200 for judging the crystallization degree of the mixer comprises the following modules:
an acquisition module 201 for acquiring an exhaust gas flow rate input to a mixer, a temperature of the mixer, and an injection amount of urea injected to the mixer;
a timing time increasing module 202 for increasing a timing time when the urea injection amount is not less than a urea injection amount threshold, the urea injection amount threshold being derived using the exhaust gas flow rate and the temperature;
a timing time reduction module 203, configured to reduce the timing time when the temperature is greater than a preset temperature and the urea injection amount of the mixer is less than a preset urea injection amount, where the preset urea injection amount is obtained by using the urea injection amount threshold;
and the crystallization degree judging module 204 is configured to obtain a crystallization degree judging result of the mixer by using the timing time.
In one possible implementation, the urea injection quantity threshold is obtained by:
a mixer experiment module for inputting the exhaust gas flow into the mixer at the temperature and continuously injecting urea into the mixer;
and the urea injection quantity threshold determining module is used for stopping the urea injection to the mixer when crystallization is generated in the mixer, and taking the total quantity of the urea injected to the mixer as the urea injection quantity threshold.
In one possible implementation, the apparatus further includes:
the experimental data acquisition module is used for acquiring a plurality of different exhaust gas flows and a plurality of different temperatures, wherein the plurality of different exhaust gas flows are respectively used as target exhaust gas flows, and the plurality of different temperatures are respectively used as target temperatures;
the mixer target condition experiment module is used for inputting the target exhaust gas flow into the mixer at the target temperature and continuously injecting urea into the mixer;
and the target urea injection quantity threshold determining module is used for stopping urea injection to the mixer when crystallization is generated in the mixer, and taking the urea injection quantity injected to the mixer as a urea injection quantity threshold at a target exhaust gas flow and a target temperature.
In one possible implementation manner, the crystallization degree judging module includes:
a crystallization risk-free determining unit configured to determine that a crystallization degree judgment result of the mixer is crystallization risk-free when the timing time is less than a first time threshold;
a low crystallization risk determining unit, configured to determine a crystallization degree determination result of the mixer as a low crystallization risk when the timing time is greater than or equal to a first time threshold and less than a second time threshold;
a medium crystallization risk determining unit, configured to determine a crystallization degree judgment result of the mixer as a medium crystallization risk when the timing time is greater than or equal to a second time threshold and less than a third time threshold;
and the high crystallization risk determining unit is used for determining the crystallization degree judging result of the mixer as high crystallization risk when the timing time is greater than or equal to a third time threshold value.
The embodiment of the application also provides a device for judging the crystallization degree of the mixer, wherein the device comprises a memory and a processor, the memory is used for storing instructions or codes, and the processor is used for executing the instructions or codes so as to enable the device to execute the steps of the method for judging the crystallization degree of the mixer.
In practical applications, the computer-readable storage medium may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium.
The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this embodiment, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. The apparatus embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and elements illustrated as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
The foregoing is only one specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (10)
1. A method for determining the degree of crystallization of a mixer, comprising:
acquiring the flow rate of the exhaust gas input into a mixer, the temperature of the mixer and the injection quantity of urea injected into the mixer;
increasing a timing time when the urea injection amount is not less than a urea injection amount threshold, the urea injection amount threshold being derived using the exhaust gas flow rate and the temperature;
reducing the timing time when the temperature is greater than a preset temperature and the urea injection amount of the mixer is less than a preset urea injection amount, the preset urea injection amount being obtained using the urea injection amount threshold;
and obtaining a crystallization degree judgment result of the mixer by using the timing time.
2. The method of claim 1, wherein the urea injection threshold is obtained by:
inputting the exhaust gas flow into the mixer at the temperature and continuously injecting urea into the mixer;
stopping the urea injection to the mixer when crystals are generated in the mixer, and taking the total amount of urea injected to the mixer as the urea injection amount threshold.
3. The method according to claim 1, wherein the method further comprises:
acquiring a plurality of different exhaust gas flows and a plurality of different temperatures, respectively taking the plurality of different exhaust gas flows as target exhaust gas flows and the plurality of different temperatures as target temperatures;
inputting the target exhaust gas flow rate into a mixer at the target temperature and continuously injecting urea into the mixer;
stopping urea injection to the mixer when crystallization occurs in the mixer, and taking the urea injection quantity injected to the mixer as a urea injection quantity threshold value at a target exhaust gas flow rate and a target temperature.
4. The method of claim 1, wherein obtaining the crystallization degree determination result of the mixer using the timing time comprises:
when the timing time is smaller than a first time threshold value, determining that the crystallization degree judgment result of the mixer is free of crystallization risk;
when the timing time is greater than or equal to a first time threshold and less than a second time threshold, determining the crystallization degree judgment result of the mixer as a low crystallization risk;
when the timing time is greater than or equal to a second time threshold and less than a third time threshold, determining the crystallization degree judgment result of the mixer as a medium crystallization risk;
and when the timing time is greater than or equal to a third time threshold, determining the crystallization degree judgment result of the mixer as high crystallization risk.
5. A device for determining the degree of crystallization of a mixer, comprising:
an acquisition module for acquiring an exhaust gas flow rate input to a mixer, a temperature of the mixer, and an injection amount of urea injected to the mixer;
the timing time increasing module is used for increasing the timing time when the urea injection quantity is not smaller than a urea injection quantity threshold value, and the urea injection quantity threshold value is obtained by utilizing the exhaust gas flow and the temperature;
a timing time reduction module, configured to reduce the timing time when the temperature is greater than a preset temperature and the urea injection amount of the mixer is less than a preset urea injection amount, where the preset urea injection amount is obtained by using the urea injection amount threshold;
and the crystallization degree judging module is used for obtaining a crystallization degree judging result of the mixer by utilizing the timing time.
6. The apparatus of claim 5, wherein the urea injection threshold is obtained by:
a mixer experiment module for inputting the exhaust gas flow into the mixer at the temperature and continuously injecting urea into the mixer;
and the urea injection quantity threshold determining module is used for stopping the urea injection to the mixer when crystallization is generated in the mixer, and taking the total quantity of the urea injected to the mixer as the urea injection quantity threshold.
7. The apparatus of claim 5, wherein the apparatus further comprises:
the experimental data acquisition module is used for acquiring a plurality of different exhaust gas flows and a plurality of different temperatures, wherein the plurality of different exhaust gas flows are respectively used as target exhaust gas flows, and the plurality of different temperatures are respectively used as target temperatures;
the mixer target condition experiment module is used for inputting the target exhaust gas flow into the mixer at the target temperature and continuously injecting urea into the mixer;
and the target urea injection quantity threshold determining module is used for stopping urea injection to the mixer when crystallization is generated in the mixer, and taking the urea injection quantity injected to the mixer as a urea injection quantity threshold at a target exhaust gas flow and a target temperature.
8. The apparatus of claim 5, wherein the crystallization degree determination module comprises:
a crystallization risk-free determining unit configured to determine that a crystallization degree judgment result of the mixer is crystallization risk-free when the timing time is less than a first time threshold;
a low crystallization risk determining unit, configured to determine a crystallization degree determination result of the mixer as a low crystallization risk when the timing time is greater than or equal to a first time threshold and less than a second time threshold;
a medium crystallization risk determining unit, configured to determine a crystallization degree judgment result of the mixer as a medium crystallization risk when the timing time is greater than or equal to a second time threshold and less than a third time threshold;
and the high crystallization risk determining unit is used for determining the crystallization degree judging result of the mixer as high crystallization risk when the timing time is greater than or equal to a third time threshold value.
9. An electronic device comprising a memory and a processor, wherein:
the memory is used for storing a computer program;
the processor is configured to execute the computer program to implement the method for determining the crystallization degree of a mixer according to any one of claims 1 to 4.
10. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the method for determining the crystallization degree of a mixer according to any one of claims 1-4.
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| CN202310796620.XA CN116838459A (en) | 2023-06-30 | 2023-06-30 | Method, device, equipment and storage medium for judging crystallization degree of mixer |
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