CN116446985B - Automobile urea box capable of automatically controlling urea liquid supply - Google Patents
Automobile urea box capable of automatically controlling urea liquid supply Download PDFInfo
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- CN116446985B CN116446985B CN202310699091.1A CN202310699091A CN116446985B CN 116446985 B CN116446985 B CN 116446985B CN 202310699091 A CN202310699091 A CN 202310699091A CN 116446985 B CN116446985 B CN 116446985B
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- urea
- preset
- tail gas
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- central control
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 239000004202 carbamide Substances 0.000 title claims abstract description 242
- 239000007788 liquid Substances 0.000 title claims abstract description 58
- 239000007789 gas Substances 0.000 claims abstract description 129
- 238000010438 heat treatment Methods 0.000 claims abstract description 76
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000001301 oxygen Substances 0.000 claims abstract description 61
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 61
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 100
- 238000000889 atomisation Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 239000003344 environmental pollutant Substances 0.000 claims description 16
- 231100000719 pollutant Toxicity 0.000 claims description 16
- 238000006722 reduction reaction Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- -1 nitrogen oxide compound Chemical class 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 17
- 230000006872 improvement Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 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
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- 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
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the technical field of tail gas treatment, in particular to an automobile urea box capable of automatically controlling urea liquid supply, which comprises: the urea storage tank comprises a liquid level meter and a temperature sensor; the conveying module comprises a conveying pipeline, a pressure sensor and a heating assembly; the injection module comprises a metering pump, an air inlet and an injection assembly; the tail gas treatment module comprises a tail gas conveying pipeline, a flow rate sensor and a reaction assembly; the central control module is used for adjusting the distance between the heating assembly and the urea storage tank in a first running state, or adjusting urea injection flow according to the oxygen concentration detected by the oxygen concentration sensor arranged in the tail gas conveying pipeline, performing secondary adjustment on the distance between the heating assembly and the urea storage tank according to the pressure of the conveying pipeline, and adjusting the compressed air inflow according to the tail gas flow rate.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to an automobile urea box capable of automatically controlling urea liquid supply.
Background
Emissions to the atmosphere of nitrogen oxides NOx are becoming more and more stringent in regulations regarding vehicle emissions. There are two methods to solve this problem, one by the EGR in-machine purification and the other by the off-machine purification to treat NOx emissions; the aqueous urea solution is hydrolyzed in the exhaust stream, which in turn converts nitrogen oxides NOx into nitrogen N2 and water H2O. SCR systems have been commonly used in vehicles of four and five countries, and the SCR system requires a storage device for aqueous urea solution, commonly referred to as a urea tank.
Chinese patent publication No.: CN215860410U discloses a double-chamber urea tank feeding device, comprising: the main urea box is arranged on the frame and is provided with a urea injection metering pump for injecting urea solution to the post-processor, and a first liquid level sensor for detecting the liquid level of the urea solution is arranged in the main urea box; the position height of the auxiliary urea box is higher than that of the main urea box, a urea supply pipeline communicated with the main urea box is arranged on the auxiliary urea box, and a normally closed electromagnetic valve is arranged on the urea supply pipeline; the electric control unit comprises a controller and an automobile instrument, the controller receives a signal of the first liquid level sensor and controls the on-off of the normally closed electromagnetic valve, the automobile instrument is connected with the first liquid level sensor to display the liquid level of the main urea box and give an alarm, and therefore, the two-cavity urea box supply device has the following problems: insufficient determination of the degree of chemical reaction of the exhaust gas treatment and insufficient atomization degree, which are reflected by an excessive oxygen concentration in the exhaust gas delivery pipe, result in a decrease in the efficiency of removal of nitrogen oxide compounds and the accuracy of removal.
Disclosure of Invention
Therefore, the invention provides the automobile urea box capable of automatically controlling the urea liquid supply, which is used for solving the problems of inaccurate judgment of insufficient chemical reaction degree of tail gas treatment and reduction of nitrogen oxide removal efficiency and removal accuracy caused by insufficient atomization degree due to overlarge oxygen concentration of a tail gas conveying pipeline in the prior art.
In order to achieve the above object, the present invention provides an automobile urea tank capable of automatically controlling supply of urea liquid, comprising: the urea storage tank is used for storing urea liquid and comprises a liquid level meter used for displaying the liquid level of the urea liquid and a temperature sensor arranged above the liquid level meter and used for detecting the temperature of the urea liquid; the delivery module is connected with the urea storage tank and used for delivering the urea liquid to the injection module, and comprises a delivery pipeline connected with the urea storage tank and used for delivering the urea liquid, a pressure sensor arranged on the delivery pipeline and used for detecting the pressure of the delivery pipeline, and a heating component arranged on the delivery pipeline and used for heating the delivery pipeline; the spraying module is connected with the conveying module, is used for spraying urea to an exhaust emission position by atomizing the urea with a corresponding dosage, and comprises a metering pump connected with the conveying pipeline and used for controlling urea spraying flow, an air inlet arranged above the metering pump and used for inputting compressed air into the metering pump, and a spraying assembly connected with the metering pump and used for spraying urea; the tail gas treatment module is connected with the injection module and is used for carrying out chemical treatment on automobile tail gas to output emissions with the pollutant concentration meeting the requirement, and comprises a tail gas conveying pipeline arranged below the injection assembly and used for conveying the automobile tail gas, a flow rate sensor arranged on the tail gas conveying pipeline and used for detecting the flow rate of the tail gas, and a reaction assembly connected with the tail gas conveying pipeline and used for converting nitrogen oxides in the tail gas into nitrogen and water, wherein an output port position of the reaction assembly is provided with a nitrogen oxide concentration sensor used for detecting the concentration of nitrogen oxide; the central control module is respectively connected with the urea storage tank, the conveying module, the injection module and the tail gas treatment module and is used for adjusting the distance between the heating assembly and the urea storage tank to a first corresponding distance in a first running state, or adjusting the urea injection flow according to the oxygen concentration detected by an oxygen concentration sensor arranged in the tail gas conveying pipeline, or adjusting the compressed air inflow to a corresponding air inflow according to the tail gas flow rate in the tail gas conveying pipeline, and secondarily adjusting the distance between the heating assembly and the urea storage tank to a second corresponding distance according to the pressure of the conveying pipeline; the first operation state is that the central control module judges that the reduction reaction degree of the tail gas is lower than an allowable range under a first content condition; the first content condition is that the oxynitride content is larger than a preset first content.
The transport module further includes:
the urea pump is connected with the conveying pipeline and used for providing conveying power of urea;
and the telescopic assembly is connected with the heating assembly and used for adjusting the distance between the heating assembly and the urea storage tank.
Further, the central control module controls the oxynitride concentration sensor to detect the oxynitride content at the output port position, and judges the reduction reaction degree of the tail gas according to the detected oxynitride content,
the central control module judges that the distance between the heating component and the urea storage tank needs to be reduced under the second content condition;
the central control module is used for primarily judging that the reaction participation degree of the oxynitride is lower than an allowable range under a third content condition, controlling the oxygen concentration sensor to detect the oxygen concentration in the tail gas conveying pipeline and secondarily judging the reaction participation degree of the oxynitride according to the detected oxygen concentration;
the central control module is used for primarily judging that the atomization degree of urea is lower than an allowable range under a fourth content condition, controlling the flow rate sensor to detect the flow rate of tail gas in the tail gas conveying pipeline and secondarily judging the atomization degree of urea according to the detected flow rate of tail gas;
the second content condition satisfies that the content of the oxynitride is larger than the preset first content and smaller than or equal to the preset second content; the third content condition satisfies that the content of the oxynitride is larger than the preset second content and smaller than or equal to the preset third content; the fourth content condition satisfies that the oxynitride content is greater than a preset third content.
Further, the central control module is provided with a plurality of adjusting modes for reducing the distance between the heating component and the urea storage tank according to the difference value between the content of the nitrogen oxide compound and the preset first content under the first content condition,
wherein, each adjustment mode is different to the regulation size that reduces the distance of heating element and urea holding vessel.
Further, the central control module carries out secondary judgment on the reaction participation degree of the oxynitride according to the obtained oxygen concentration under the third content condition, wherein,
the central control module secondarily judges that the reaction participation degree of the oxynitride is lower than the allowable range under the condition of the preset oxygen concentration, and the central control module adjusts the urea injection flow of the injection assembly;
the preset oxygen concentration condition is that the oxygen concentration in the automobile exhaust is larger than the preset oxygen concentration.
Further, the central control module is provided with a plurality of adjusting methods aiming at increasing the urea injection flow according to the difference value between the oxygen concentration in the automobile exhaust and the preset oxygen concentration under the preset oxygen concentration condition,
wherein, each adjusting method is different in adjusting size for increasing urea injection flow.
Further, the central control module carries out secondary judgment on the atomization degree of the urea according to the obtained tail gas flow rate under the fourth content condition, wherein,
the central control module secondarily judges that the atomization degree of urea is lower than an allowable range under the condition of the preset tail gas flow rate, and the central control module adjusts the air inflow of compressed air;
the preset tail gas flow rate condition is that the tail gas flow rate is larger than the preset tail gas flow rate.
Further, the central control module is provided with a plurality of adjusting modes for increasing the air inflow of the compressed air according to the difference value between the tail gas flow rate and the preset tail gas flow rate under the condition of the preset tail gas flow rate,
wherein, each regulation mode is different to the regulation size of compressed air input.
Further, after the distance between the heating component and the urea storage tank is regulated, the central control module controls the pressure sensor to detect the pressure of the conveying pipeline,
the central control module judges that the distance between the heating component and the urea storage tank is secondarily adjusted under the condition of preset pipeline pressure;
the preset pipeline pressure condition is that the pressure of the conveying pipeline is larger than the preset pipeline pressure.
Further, the central control module is provided with a plurality of secondary adjusting methods for the distance between the heating component and the urea storage tank according to the difference value between the pressure of the conveying pipeline and the pressure of the preset pipeline under the condition of the pressure of the preset pipeline,
wherein, each secondary adjustment method is different in the adjustment of increasing the distance between the heating component and the urea storage tank.
Compared with the prior art, the automobile urea tank has the beneficial effects that the automobile urea tank is provided with the urea storage tank, the conveying module, the spraying module, the tail gas treatment module and the central control module, and is used for reacting the nitrogen oxide generated in the running process of the automobile so as to reduce the harm of the nitrogen oxide to the environment and the human body, the central control module reduces the distance between the heating assembly and the urea storage tank according to the nitrogen oxide concentration at the output port of the reaction assembly so as to reduce the precipitation amount of urea in urea liquid, or increases the urea spraying flow according to the oxygen concentration in automobile tail gas so as to promote the reaction of converting the nitrogen oxide into nitrogen to be carried out towards the positive and negative direction, and after the distance between the heating assembly and the urea storage tank is adjusted once, the distance between the heating assembly and the urea storage tank is adjusted twice according to the pressure of a conveying pipeline, the pressure of the conveying pipeline is reduced by increasing the distance between the heating assembly and the urea storage tank, and the atomization degree of the urea liquid is increased according to the tail gas flow rate, and the improvement of the removal efficiency and the removal accuracy of the urea tank on the tail gas pollutant is realized.
Further, the automobile urea box detects the oxynitride at the position of the output port, the oxynitride in the automobile exhaust can cause environmental pollution, the automobile urea box has serious harm to human bodies and crops, after judging that the completeness of the exhaust reduction reaction is lower than an allowable range, the central control module calculates the difference value of the oxynitride content and the preset first content, adjusts the distance between the heating assembly and the urea storage tank by using a corresponding preset distance adjustment coefficient, increases the heating efficiency of the heating assembly by reducing the distance between the heating assembly and the urea storage tank, further reduces the precipitation rate of urea solids due to environmental factors, increases the concentration of urea participating in the treatment of the oxynitride, and further realizes the improvement of the removal efficiency and the removal accuracy of the exhaust pollutant by the urea box.
Further, the nitrogen oxide is detected at the position of the output port of the automobile urea box, the central control module controls the oxygen concentration sensor to detect the oxygen concentration in the automobile exhaust after the preliminary judgment that the reaction process is lower than the allowable range, calculates the difference value between the oxygen concentration in the automobile exhaust and the preset oxygen concentration, adjusts the urea injection flow by using the corresponding preset flow adjustment coefficient, and promotes the reaction of converting the nitrogen oxide into nitrogen to be carried out towards the positive reaction direction by increasing the urea injection flow, so that the improvement of the efficiency and the accuracy of removing the tail gas pollutants by the urea box is further realized.
Furthermore, after the distance between the heating component and the urea storage tank is adjusted once, the pressure sensor is controlled by the central control module to detect the pressure of the conveying pipeline, the urea decomposition rate is accelerated and the pipeline pressure is increased due to the fact that the distance between the heating component and the urea storage tank is reduced, when the pressure of the conveying pipeline is larger than the preset pipeline pressure, the central control module calculates the difference value between the pressure of the conveying pipeline and the preset pipeline pressure, and adjusts the distance between the heating component and the urea storage tank for the second time according to the corresponding preset distance adjusting coefficient, and the conveying pipeline pressure is reduced by increasing the distance between the heating component and the urea storage tank, so that the tail gas pollutant removal efficiency and the tail gas pollutant removal accuracy of the urea tank are further improved.
Further, after the automobile urea box completes one-time adjustment of the distance between the heating assembly and the urea storage tank, the central control module controls the flow rate sensor to detect the flow rate of the tail gas, when the flow rate of the tail gas is larger than the preset flow rate of the tail gas, the central control module judges that the running power of the engine exceeds the allowable range and calculates the difference value between the flow rate of the tail gas and the flow rate of the preset tail gas, the compressed air inflow is adjusted according to the calculation result by selecting the corresponding preset volume adjustment coefficient, the atomization degree of urea liquid is increased by increasing the compressed air inflow, and the improvement of the efficiency and the accuracy of removing the tail gas pollutants by the urea box is further realized.
Drawings
FIG. 1 is a schematic diagram of an overall structure of an automobile urea tank capable of automatically controlling urea liquid supply according to an embodiment of the invention;
FIG. 2 is a block diagram showing the overall structure of an automobile urea tank capable of automatically controlling urea liquid supply according to an embodiment of the present invention;
FIG. 3 is a block diagram showing a specific structure of a transport module of an automobile urea tank capable of automatically controlling urea liquid supply according to an embodiment of the present invention;
fig. 4 is a specific block diagram of an exhaust gas treatment module of an automobile urea tank capable of automatically controlling urea liquid supply according to an embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1, fig. 2, fig. 3, and fig. 4, an overall structure diagram, an overall structure block diagram, a specific structure block diagram of a conveying module, and a specific structure block diagram of an exhaust gas treatment module of an automobile urea tank capable of automatically controlling urea liquid supply according to an embodiment of the invention are shown. The embodiment of the invention provides an automobile urea box capable of automatically controlling urea liquid supply, which comprises:
a urea storage tank 2 for storing urea liquid, comprising a liquid level meter 17 for displaying the liquid level of the urea liquid and a temperature sensor 1 arranged above the liquid level meter 17 for detecting the temperature of the urea liquid;
the delivery module is connected with the urea storage tank 2 and is used for delivering the urea liquid to the injection module, and comprises a delivery pipeline 5 connected with the urea storage tank 2 and used for delivering the urea liquid, a pressure sensor 6 arranged on the delivery pipeline 5 and used for detecting the pressure of the delivery pipeline 5, and a heating component 3 arranged on the delivery pipeline 5 and used for heating the delivery pipeline 5;
the injection module is connected with the conveying module and is used for spraying urea to an exhaust emission position by atomizing urea with corresponding dosage, and comprises a metering pump 7 connected with the conveying pipeline 5 and used for controlling urea spraying flow, an air inlet 9 arranged above the metering pump 7 and used for inputting compressed air into the metering pump 7, and an injection assembly 11 connected with the metering pump 7 and used for spraying urea;
the tail gas treatment module is connected with the injection module and is used for carrying out chemical treatment on automobile tail gas to output emissions with the pollutant concentration meeting the requirement, and comprises a tail gas conveying pipeline 10 arranged below the injection assembly 11 and used for conveying the automobile tail gas, a flow rate sensor arranged on the tail gas conveying pipeline 10 and used for detecting the flow rate of the tail gas, and a reaction assembly 13 connected with the tail gas conveying pipeline 10 and used for converting nitrogen oxides in the tail gas into nitrogen and water, wherein a nitrogen oxide concentration sensor 15 used for detecting the concentration of nitrogen oxide is arranged at the position of an output port 14 of the reaction assembly 13;
a central control module respectively connected with the urea storage tank 2, the delivery module, the injection module and the exhaust gas treatment module, for adjusting the distance between the heating assembly 3 and the urea storage tank 2 to a first corresponding distance in a first operation state, or adjusting the urea injection flow rate according to the oxygen concentration detected by the oxygen concentration sensor 12 arranged in the exhaust gas delivery pipeline 10, or adjusting the compressed air intake amount to a corresponding air intake amount according to the exhaust gas flow rate in the exhaust gas delivery pipeline,
the distance between the heating component and the urea storage tank is secondarily adjusted to a second corresponding distance according to the pressure of the conveying pipeline;
the first operation state is that the central control module judges that the reduction reaction degree of the tail gas is lower than an allowable range under a first content condition; the first content condition is that the oxynitride content is larger than a preset first content.
In particular, the injection module further comprises a control valve 8 connected to the air inlet 9 for controlling the flow of compressed air.
The automobile urea tank is provided with the urea storage tank 2, the conveying module, the spraying module, the tail gas treatment module and the central control module, and is used for reacting nitrogen oxides generated in the running process of the automobile so as to reduce the harm of the nitrogen oxides to the environment and human bodies, the central control module reduces the distance between the heating assembly 3 and the urea storage tank 2 according to the concentration of the nitrogen oxides at the position of the output port 14 of the reaction assembly 13 so as to reduce the precipitation amount of urea in urea liquid, or the urea spraying flow rate is increased according to the oxygen concentration in automobile tail gas so as to promote the reaction of converting the nitrogen oxides into nitrogen to be carried out towards the positive reaction direction, and after the distance between the heating assembly 3 and the urea storage tank 2 is adjusted once, the distance between the heating assembly 3 and the urea storage tank 2 is adjusted twice according to the pressure of the conveying pipeline 5, the pressure of the conveying pipeline 5 is reduced by increasing the distance between the heating assembly 3 and the urea storage tank 2, and the atomization degree of the urea liquid is increased according to the tail gas flow rate, and the improvement of the tail gas pollutant removal efficiency and the removal accuracy of the urea tank is realized.
Further, the conveying module further includes:
a urea pump 4 connected to the delivery pipe 5 for supplying power for delivering urea;
a telescopic assembly 16 connected to the heating assembly 3 for adjusting the distance between the heating assembly 3 and the urea storage tank 2.
It will be appreciated by those skilled in the art that, as a preferred embodiment of the present invention, the telescopic assembly 16 may be an electric telescopic rod or an electric sliding rail, and only the adjustment function for the distance between the heating assembly and the urea storage tank is required, and other alternatives of the telescopic assembly will not be described herein.
Further, the central control module controls the oxynitride concentration sensor 15 to detect the oxynitride content at the position of the output port 14, and determines the reduction reaction degree of the tail gas according to the detected oxynitride content, wherein,
the central control module judges that the distance between the heating component 3 and the urea storage tank 2 needs to be reduced under the second content condition;
the central control module is used for primarily judging that the reaction participation degree of the oxynitride is lower than an allowable range under a third content condition, controlling the oxygen concentration sensor to detect the oxygen concentration in the tail gas conveying pipeline and secondarily judging the reaction participation degree of the oxynitride according to the detected oxygen concentration;
the central control module is used for primarily judging that the atomization degree of urea is lower than an allowable range under a fourth content condition, controlling the flow rate sensor to detect the flow rate of tail gas in the tail gas conveying pipeline and secondarily judging the atomization degree of urea according to the detected flow rate of tail gas;
the second content condition satisfies that the content of the oxynitride is larger than the preset first content and smaller than or equal to the preset second content; the third content condition satisfies that the content of the oxynitride is larger than the preset second content and smaller than or equal to the preset third content; the fourth content condition satisfies that the oxynitride content is greater than a preset third content.
Specifically, the oxynitride content is denoted as H, the preset first content is denoted as H1, the preset second content is denoted as H2, and the preset third content is denoted as H3.
Further, the central control module is provided with a plurality of adjusting modes for reducing the distance between the heating component 3 and the urea storage tank 2 according to the difference value between the content of the nitrogen oxide compound and the preset first content under the first content condition,
wherein each adjustment is of a different magnitude for reducing the distance of the heating assembly 3 from the urea storage tank 2.
The first adjusting mode is that the central control module adjusts the distance between the heating component 3 and the urea storage tank 2 to a first distance by using a preset second distance adjusting coefficient under the condition of a preset first content difference value;
the second adjusting mode is that the central control module adjusts the distance between the heating component 3 and the urea storage tank 2 to a second distance by using a preset first distance adjusting coefficient under the condition of presetting a second content difference value;
the preset first content difference condition is that the difference between the content of the oxynitride and the preset first content is smaller than or equal to the preset content difference; the preset second content difference condition is that the difference between the content of the oxynitride and the preset first content is larger than the preset content difference.
Specifically, the difference between the oxynitride content and the preset first content is denoted as Δh, Δh=h—h1 is set, the preset content difference is denoted as Δh0, the preset first distance adjustment coefficient is denoted as α1, the preset second distance adjustment coefficient is denoted as α2,0 < α1 < α2 < 1, the distance between the heating element 3 and the urea storage tank 2 is denoted as L, the distance between the adjusted heating element 3 and the urea storage tank 2 is denoted as L ', and L' =lxαi is set, wherein αi is the i-th distance adjustment coefficient, i=1, 2.
According to the automobile urea box, the nitrogen oxide is detected at the position of the output port 14, the nitrogen oxide in automobile exhaust can cause environmental pollution, the automobile urea box has serious harm to human bodies and crops, after judging that the completeness of the exhaust reduction reaction is lower than an allowable range, the central control module calculates the difference value between the nitrogen oxide content and the preset first content, adjusts the distance between the heating assembly 3 and the urea storage tank 2 by using the corresponding preset distance adjustment coefficient, increases the heating efficiency of the heating assembly 3 by reducing the distance between the heating assembly 3 and the urea storage tank 2, further reduces the precipitation rate of urea solids due to environmental factors, increases the concentration of urea participating in treating the nitrogen oxide, and further realizes the improvement of the removal efficiency and the removal accuracy of the urea box to the exhaust pollutants.
Further, the central control module carries out secondary judgment on the reaction participation degree of the oxynitride according to the obtained oxygen concentration under the third content condition, wherein,
the central control module secondarily judges that the reaction participation degree of the oxynitride is lower than the allowable range under the condition of the preset oxygen concentration, and the central control module adjusts the urea injection flow of the injection assembly;
the preset oxygen concentration condition is that the oxygen concentration in the automobile exhaust is larger than the preset oxygen concentration.
Specifically, the oxygen concentration in the automobile exhaust is denoted as R, and the preset oxygen concentration is denoted as R0.
Further, the central control module is provided with a plurality of adjusting methods aiming at increasing the urea injection flow according to the difference value between the oxygen concentration in the automobile exhaust and the preset oxygen concentration under the preset oxygen concentration condition,
wherein, each adjusting method is different in adjusting size for increasing urea injection flow.
The first urea injection flow rate adjusting method is that the central control module adjusts the urea injection flow rate to a first flow rate by using a preset first flow rate adjusting coefficient under the condition of presetting a first concentration difference value;
the second urea injection flow rate adjusting method is that the central control module adjusts the urea injection flow rate to a second flow rate by using a preset second flow rate adjusting coefficient under the condition of a preset second concentration difference value;
the preset first concentration difference condition is that the difference between the concentration of oxygen in the automobile exhaust and the preset concentration of oxygen is smaller than or equal to the preset concentration difference; the preset second concentration difference condition is that the difference between the oxygen concentration in the automobile exhaust and the preset oxygen concentration is larger than the preset concentration difference.
Specifically, the difference between the oxygen concentration in the exhaust gas of the automobile and the preset oxygen concentration is denoted as Δr, Δr=r-R0 is set, the preset concentration difference is denoted as Δr0, the preset first flow adjustment coefficient is denoted as β1, the preset second flow adjustment coefficient is denoted as β2,1 < β1 < β2, the urea injection flow is denoted as V, the adjusted urea injection flow is denoted as V ', and V' =v×βj is set, wherein βj is the preset jth flow adjustment coefficient, j=1, 2.
According to the automobile urea box, the nitrogen oxides are detected at the position of the output port 14, the central control module controls the oxygen concentration sensor 12 to detect the oxygen concentration in automobile exhaust after the initial judgment that the reaction process is lower than the allowable range, calculates the difference value between the oxygen concentration in the automobile exhaust and the preset oxygen concentration, adjusts the urea injection flow by using the corresponding preset flow adjustment coefficient, and promotes the reaction of converting the nitrogen oxides into nitrogen to be carried out towards the positive reaction direction by increasing the urea injection flow, so that the improvement of the urea box on the tail gas pollutant removal efficiency and the removal accuracy is further realized.
Further, the central control module carries out secondary judgment on the atomization degree of the urea according to the obtained tail gas flow rate under the fourth content condition, wherein,
the central control module secondarily judges that the atomization degree of urea is lower than an allowable range under the condition of the preset tail gas flow rate, and the central control module adjusts the air inflow of compressed air;
the preset tail gas flow rate condition is that the tail gas flow rate is larger than the preset tail gas flow rate.
Specifically, the tail gas flow rate is noted as U, and the preset tail gas flow rate is noted as U0.
Further, the central control module is provided with a plurality of adjusting modes for increasing the air inflow of the compressed air according to the difference value between the tail gas flow rate and the preset tail gas flow rate under the condition of the preset tail gas flow rate,
wherein, each regulation mode is different to the regulation size of compressed air input.
The first gas volume adjusting mode is that the central control module adjusts the air inflow of the compressed air to a first air inflow by using a preset first volume adjusting coefficient under the condition of a preset first flow rate difference value;
the second gas volume adjusting mode is that the central control module adjusts the compressed air inlet amount to a second air inlet amount by using a preset second volume adjusting coefficient under the condition of a preset second flow rate difference value;
the preset first flow speed difference value condition is that the difference value between the tail gas flow speed and the preset tail gas flow speed is smaller than or equal to the preset flow speed difference value; the preset second flow rate difference condition is that the difference between the tail gas flow rate and the preset tail gas flow rate is larger than the preset flow rate difference.
Specifically, the difference between the exhaust gas flow rate and the preset exhaust gas flow rate is denoted as Δu, Δu=u-U0 is set, the preset flow rate difference is denoted as Δu ', the preset first volume adjustment coefficient is denoted as δ1, the preset second volume adjustment coefficient is denoted as δ2,0 < δ1 < δ2 < 1, the compressed air intake amount is denoted as G, the adjusted compressed air intake amount is denoted as G ', G ' =g× (1+δg) is set, wherein δg is the preset G-th volume adjustment coefficient, and g=1, 2 is set.
After the automobile urea box completes one-time adjustment of the distance between the heating component 3 and the urea storage tank 2, the central control module controls the flow rate sensor to detect the flow rate of the tail gas, when the flow rate of the tail gas is larger than the preset flow rate of the tail gas, the central control module judges that the running power of the engine exceeds the allowable range and calculates the difference value between the flow rate of the tail gas and the flow rate of the preset tail gas, the air inflow of the compressed air is adjusted according to the calculation result by selecting the corresponding preset volume adjustment coefficient, the atomization degree of urea liquid is increased by increasing the air inflow of the compressed air, and the improvement of the efficiency and the accuracy of removing the tail gas pollutants by the urea box is further realized.
Further, after the distance between the heating assembly and the urea storage tank is adjusted, the central control module controls the pressure sensor 6 to detect the pressure of the conveying pipeline 5,
the central control module judges that the distance between the heating component 3 and the urea storage tank 2 is secondarily adjusted under the condition of preset pipeline pressure;
wherein the preset pipeline pressure condition satisfies that the pressure of the conveying pipeline 5 is greater than the preset pipeline pressure.
Specifically, the pressure of the delivery pipe 5 is denoted as P, and the preset pipe pressure is denoted as P0.
Further, the central control module is provided with a plurality of secondary adjustment methods for the distance between the heating component 3 and the urea storage tank 2 according to the difference value between the pressure of the conveying pipeline 5 and the preset pipeline pressure under the preset pipeline pressure condition,
wherein each secondary adjustment method is of different magnitude for increasing the distance of the heating assembly 3 from the urea storage tank 2.
The first secondary adjustment method is that the central control module adjusts the distance between the heating component 3 and the urea storage tank 2 to a third distance by using a preset third distance adjustment coefficient under the condition of a preset first pressure difference value;
the second secondary adjustment method is that the central control module adjusts the distance between the heating component 3 and the urea storage tank 2 to a fourth distance by using a preset fourth distance adjustment coefficient under the condition of preset second pressure difference;
the preset first pressure difference condition is that the difference between the pressure of the conveying pipeline 5 and the preset pipeline pressure is smaller than or equal to the preset pressure difference; the preset second pressure difference condition is that the difference between the pressure of the conveying pipeline 5 and the preset pipeline pressure is larger than the preset pressure difference.
Specifically, the difference between the pressure of the connecting line and the preset line pressure is denoted as Δp, Δp=p-P0 is set, the preset pressure difference is denoted as Δp ', the preset third distance adjustment coefficient is denoted as α3, the preset fourth distance adjustment coefficient is denoted as α4, wherein 1 < α3 < α4, the distance between the secondarily adjusted heating element 3 and the urea storage tank 2 is denoted as L ", L" =l' ×αk is set, wherein αk is the kth distance adjustment coefficient, and i=3, 4 is set.
After the distance between the heating component 3 and the urea storage tank 2 is adjusted once, the pressure sensor 6 is controlled by the central control module to detect the pressure of the conveying pipeline 5, the urea decomposition rate is accelerated and the pipeline pressure is increased due to the fact that the distance between the heating component 3 and the urea storage tank 2 is reduced, when the pressure of the conveying pipeline 5 is larger than the preset pipeline pressure, the central control module calculates the difference value between the pressure of the conveying pipeline 5 and the preset pipeline pressure, and secondary adjustment is carried out on the distance between the heating component 3 and the urea storage tank 2 according to the corresponding preset distance adjustment coefficient, and the pressure of the conveying pipeline 5 is reduced by increasing the distance between the heating component 3 and the urea storage tank 2, so that the tail gas pollutant removal efficiency and the tail gas pollutant removal accuracy of the urea tank are further improved.
Example 1
In this example 1, the difference between the exhaust gas flow rate and the preset exhaust gas flow rate is denoted as Δu, the preset flow rate difference is denoted as Δu ', the preset first volume adjustment coefficient is denoted as δ1, the preset second volume adjustment coefficient is denoted as δ2, and the compressed air intake amount is denoted as G, where Δu' =10g/s, δ1=0.2, δ2=0.3, g=2.5G/s,
in the embodiment, deltaU=4g/s is obtained, the central control module judges DeltaU is less than or equal to DeltaU 'and adjusts the air inflow of the compressed air by using Delta1, and the adjusted air inflow G' =2.5G/s× (1+0.2) =3G/s.
After the Δu is obtained in this embodiment 1, the central control module adjusts the air intake of the compressed air by using δ1, so as to increase the atomization degree of the urea liquid, further increase the contact area between the urea liquid and the automobile exhaust, and further realize the improvement of the removal efficiency and the removal accuracy of the urea box for the exhaust pollutants.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An automotive urea tank capable of automatically controlling urea liquid supply, comprising:
the urea storage tank is used for storing urea liquid and comprises a liquid level meter used for displaying the liquid level of the urea liquid and a temperature sensor arranged above the liquid level meter and used for detecting the temperature of the urea liquid;
the delivery module is connected with the urea storage tank and used for delivering the urea liquid to the injection module, and comprises a delivery pipeline connected with the urea storage tank and used for delivering the urea liquid, a pressure sensor arranged on the delivery pipeline and used for detecting the pressure of the delivery pipeline, and a heating component arranged on the delivery pipeline and used for heating the delivery pipeline;
the spraying module is connected with the conveying module, is used for spraying urea to an exhaust emission position by atomizing the urea with a corresponding dosage, and comprises a metering pump connected with the conveying pipeline and used for controlling urea spraying flow, an air inlet arranged above the metering pump and used for inputting compressed air into the metering pump, and a spraying assembly connected with the metering pump and used for spraying urea;
the tail gas treatment module is connected with the injection module and is used for carrying out chemical treatment on automobile tail gas to output emissions with the pollutant concentration meeting the requirement, and comprises a tail gas conveying pipeline arranged below the injection assembly and used for conveying the automobile tail gas, a flow rate sensor arranged on the tail gas conveying pipeline and used for detecting the flow rate of the tail gas, and a reaction assembly connected with the tail gas conveying pipeline and used for converting nitrogen oxides in the tail gas into nitrogen and water, wherein an output port position of the reaction assembly is provided with a nitrogen oxide concentration sensor used for detecting the concentration of nitrogen oxide;
the central control module is respectively connected with the urea storage tank, the conveying module, the injection module and the tail gas treatment module and is used for adjusting the distance between the heating assembly and the urea storage tank to a first corresponding distance in a first running state, or adjusting the urea injection flow according to the oxygen concentration detected by an oxygen concentration sensor arranged in the tail gas conveying pipeline, or adjusting the compressed air inflow to a corresponding air inflow according to the tail gas flow rate in the tail gas conveying pipeline,
the distance between the heating component and the urea storage tank is secondarily adjusted to a second corresponding distance according to the pressure of the conveying pipeline;
the first operation state is that the central control module judges that the reduction reaction degree of the tail gas is lower than an allowable range under a first content condition; the first content condition is that the oxynitride content is larger than a preset first content;
the central control module controls the nitrogen oxide concentration sensor to detect the nitrogen oxide content at the position of the output port and judges the reduction reaction degree of the tail gas according to the detected nitrogen oxide content, wherein,
the central control module judges that the distance between the heating component and the urea storage tank needs to be reduced under the second content condition;
the central control module is used for primarily judging that the reaction participation degree of the oxynitride is lower than an allowable range under a third content condition, controlling the oxygen concentration sensor to detect the oxygen concentration in the tail gas conveying pipeline and secondarily judging the reaction participation degree of the oxynitride according to the detected oxygen concentration;
the central control module is used for primarily judging that the atomization degree of urea is lower than an allowable range under a fourth content condition, controlling the flow rate sensor to detect the flow rate of tail gas in the tail gas conveying pipeline and secondarily judging the atomization degree of urea according to the detected flow rate of tail gas;
the second content condition satisfies that the content of the oxynitride is larger than the preset first content and smaller than or equal to the preset second content; the third content condition satisfies that the content of the oxynitride is larger than the preset second content and smaller than or equal to the preset third content; the fourth content condition satisfies that the oxynitride content is larger than a preset third content;
the central control module is provided with a plurality of adjusting modes for reducing the distance between the heating component and the urea storage tank according to the difference value between the content of the nitrogen oxide compound and the preset first content under the first content condition,
wherein, each adjustment mode is different to the regulation size that reduces the distance of heating element and urea holding vessel.
2. The auto urea tank with automatically controllable urea liquid supply according to claim 1, wherein the delivery module further comprises:
the urea pump is connected with the conveying pipeline and used for providing conveying power of urea;
and the telescopic assembly is connected with the heating assembly and used for adjusting the distance between the heating assembly and the urea storage tank.
3. The auto urea tank capable of automatically controlling urea liquid supply according to claim 1, wherein the central control module makes a secondary determination of the reaction participation degree of oxynitride based on the obtained oxygen concentration under the third content condition, wherein,
the central control module secondarily judges that the reaction participation degree of the oxynitride is lower than the allowable range under the condition of the preset oxygen concentration, and the central control module adjusts the urea injection flow of the injection assembly;
the preset oxygen concentration condition is that the oxygen concentration in the automobile exhaust is larger than the preset oxygen concentration.
4. The auto urea tank capable of automatically controlling urea liquid supply according to claim 3, wherein the central control module is provided with a plurality of adjusting methods for increasing urea injection flow according to the difference between the oxygen concentration in the automobile exhaust and the preset oxygen concentration under the preset oxygen concentration condition,
wherein, each adjusting method is different in adjusting size for increasing urea injection flow.
5. The auto urea tank with automatic control of urea liquid supply according to claim 4, wherein the central control module makes a secondary determination of the atomization degree of urea according to the exhaust gas flow rate under the fourth content condition, wherein,
the central control module secondarily judges that the atomization degree of urea is lower than an allowable range under the condition of the preset tail gas flow rate, and the central control module adjusts the air inflow of compressed air;
the preset tail gas flow rate condition is that the tail gas flow rate is larger than the preset tail gas flow rate.
6. The auto urea tank capable of automatically controlling urea liquid supply according to claim 5, wherein the central control module is provided with a plurality of adjusting modes for increasing the air inflow of the compressed air according to the difference value between the exhaust gas flow rate and the preset exhaust gas flow rate under the preset exhaust gas flow rate condition,
wherein, each regulation mode is different to the regulation size of compressed air input.
7. The auto urea tank capable of automatically controlling urea liquid supply according to claim 1, wherein the central control module controls the pressure sensor to detect the pressure of the delivery pipe after adjusting the distance between the heating assembly and the urea storage tank,
the central control module judges that the distance between the heating component and the urea storage tank is secondarily adjusted under the condition of preset pipeline pressure;
the preset pipeline pressure condition is that the pressure of the conveying pipeline is larger than the preset pipeline pressure.
8. The auto urea tank capable of automatically controlling urea liquid supply according to claim 7, wherein the central control module is provided with a plurality of secondary adjustment methods for the distance between the heating assembly and the urea storage tank according to the difference between the pressure of the conveying pipeline and the preset pipeline pressure under the preset pipeline pressure condition,
wherein, each secondary adjustment method is different in the adjustment of increasing the distance between the heating component and the urea storage tank.
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