CN108479490B - Production control method of urea solution for vehicles - Google Patents

Production control method of urea solution for vehicles Download PDF

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CN108479490B
CN108479490B CN201810216951.0A CN201810216951A CN108479490B CN 108479490 B CN108479490 B CN 108479490B CN 201810216951 A CN201810216951 A CN 201810216951A CN 108479490 B CN108479490 B CN 108479490B
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light beam
refractive index
vehicle
urea
urea solution
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CN108479490A (en
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袁敏
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Yitong Environmental Protection Putian Co ltd
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Yitong Environmental Protection Putian Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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Abstract

The invention discloses a production control method of a urea solution for a vehicle, which relates to the field of environmental protection and comprises the following steps: collecting a first intrinsic offset distance between a light beam emitted by the light beam emitting module and a light beam received by the light beam receiving module when the convex part is in an emptying state; in the production work of the automobile urea, collecting a second relative offset distance, a first incident angle and an inner height of a convex part of a first light beam and a second light beam which are emitted and received, and solving the refractive index of the automobile urea; if the refractive index does not belong to the preset refractive interval, adding the first material or the second material to the stirring cavity. According to the invention, the on-line test of the refractive index is realized through the matching of the convex part and the refractive index detection module, and whether the first material or the second material needs to be added or not is judged through the refractive index obtained by the on-line test, so that the material is added, the accuracy of controlling the concentration of the vehicle urea solution is effectively improved, the quality and the catalytic performance of the vehicle urea solution are improved, the diesel engine tail gas treatment capacity of an SCR system is improved, and the environmental protection is realized.

Description

Production control method of urea solution for vehicles
Technical Field
The invention relates to the field of environmental protection, in particular to a production control method of a urea solution for a vehicle.
Background
The SCR solution has significant advantages in the tail gas emission treatment system of national iv diesel vehicles, whereas automotive urea is a necessary additive for the SCR solution. As environmental protection departments of various countries propose to further reduce nitrogen oxide pollutants emitted by diesel engines. The national standard is called Europe IV. Engine manufacturers began using SCR technology (Selective Catalytic reduction technology) to meet environmental sector requirements. The diesel engine tail gas treatment liquid (commonly known as automobile urea, automobile urea and automobile environment-friendly urea in China) is a consumable product which is required to be used in the SCR technology.
At present, the automobile urea solution is produced by mixing and stirring high-purity water and high-purity urea to form the automobile urea solution, and the proportion of the high-purity water and the high-purity urea is obtained by calculation in advance. Because the calculation is carried out in advance, the concentration of the vehicle urea solution is not easy to adjust under the condition of water evaporation or inaccurate material feeding after the production of the urea solution and the water evaporation. Meanwhile, the prior art does not have a good technical scheme for the on-line test of the vehicle urea solution.
Disclosure of Invention
In view of at least part of the defects in the prior art, the invention aims to provide a production control method of a vehicle urea solution, which aims to realize the control of the concentration of the vehicle urea solution and improve the yield by testing the refractive index of the solution in a vehicle urea solution stirring cavity on line and adding materials again through the refractive index.
In order to achieve the above object, the present invention provides a method for controlling production of a urea solution for a vehicle, the method being used for a urea solution production apparatus for a vehicle to produce a urea solution for a vehicle, the urea solution production apparatus for a vehicle comprising a stirring chamber, the stirring chamber being provided with a stirring device; the stirring cavity comprises a protruding part with a lateral part transversely arranged for installing a refractive index detection device, the bottom and the top of the protruding part are flat and shaped, and the bottom and the top of the protruding part are made of transparent materials; the refractive index detection device comprises a concave cavity matched with the convex part, a light beam emitting module arranged at the top of the concave cavity and a light beam receiving module arranged at the bottom of the concave cavity; the first light beam emitted by the light beam emitting module enters the convex part in an oblique incidence mode; the method comprises the following steps:
collecting a first intrinsic offset distance L between a first light beam emitted by the light beam emitting module and a second light beam received by the light beam receiving module when the convex part is in an empty state0；
In the production work of the vehicle urea, in response to the stopping of the stirring device, acquiring a second relative offset distance L between a first light beam emitted by the light beam emitting module and a second light beam received by the light beam receiving module, acquiring a first incident angle α of the first light beam, and acquiring the inner height h of the boss;
solving the refractive index n of the vehicle urea; the refractive index satisfies:
Figure BDA0001598841800000021
comparing the refractive index with a preset refractive interval; if the refractive index belongs to the preset refractive interval, executing a first response; if the refractive index does not belong to the preset refractive interval, generating an unfinished instruction for the production of the automotive urea;
in response to the vehicle urea production incomplete command, adding a first material or a second material to the stir chamber.
In the technical scheme, the on-line test of the refractive index is realized through the matching of the convex part and the refractive index detection module, and whether the first material or the second material needs to be added or not is judged through the refractive index obtained by the on-line test so as to facilitate the addition of the materials. By adopting the technical scheme, the accuracy of controlling the concentration of the urea solution for the vehicle is effectively improved, the quality and the catalytic performance of the urea solution for the vehicle are improved, the diesel engine tail gas treatment capacity of the SCR system is improved, and the environmental protection is realized. In the technical scheme, the method comprises the following steps
Figure BDA0001598841800000031
The refractive index of the light-transmitting window made of transparent materials of the protruding part is fully considered, and the refractive index solving precision is improved.
In a specific embodiment, the adding the first material or the second material to the stirring chamber in response to the instruction that the urea production for vehicles is not completed further includes:
adding a first material to the stirring cavity in response to the refractive index being smaller than the minimum value of the preset refractive interval;
or responding to the refractive index being larger than the maximum value of the preset refractive interval, and adding a second material to the stirring cavity.
In a specific embodiment, the method further includes:
in response to the refractive index being less than the minimum of the preset refractive interval, adding a mass M to the stirring chambernew_1The first material of (a); the above-mentioned
Figure BDA0001598841800000032
Or in response to said refractive index being greater than said refractive indexSetting the maximum value of the interval, adding mass M to the stirring cavitynew_2The second material of (a); the above-mentioned
Figure BDA0001598841800000033
Wherein, M isold_allThe total mass of the urea solution for the current vehicle is ηsetA preferred concentration set point for the urea for the vehicle, ηoldη for current concentration value of vehicle ureaoldKn-b; the k satisfies: k is more than or equal to 3 and less than or equal to 7; the b satisfies: b is more than or equal to 4 and less than or equal to 10.
In the technical scheme, the quality of the added materials is solved through the refractive index, so that the accuracy of the concentration of the vehicle urea solution is improved.
In one embodiment, k and b can be obtained by detecting the refractive index of each concentration through standard experiments and performing linear regression.
In a specific embodiment, the urea solution production device for the vehicle further comprises a main controller, wherein the main controller is connected with an opening and closing control end of the stirring device; the response of stopping the stirring device means that the main controller controls the stirring device to be in a closed state.
In a specific embodiment, the urea solution production device for vehicles further comprises a vibration collector installed on the stirring device and used for collecting the working state of the stirring device.
In a specific embodiment, the incident angle of the light beam emitted by the light beam emitting module relative to the convex part is 5-85 degrees.
In one embodiment, the first material is urea for vehicles and the second material is high purity water.
The invention has the beneficial effects that: according to the invention, the on-line test of the refractive index is realized by matching the bulge part with the refractive index detection module, and whether the first material or the second material needs to be added or not is judged by the refractive index obtained by the on-line test so as to facilitate the addition of the materials. The invention effectively improves the accuracy of controlling the concentration of the urea solution for the vehicle, improves the quality of the urea solution for the vehicle and improves the quality of the urea solution for the vehicleThe catalytic performance improves the diesel engine tail gas treatment capacity of the SCR system, and the environmental protection is realized. The invention is provided with
Figure BDA0001598841800000041
The refractive index of the light-transmitting window made of transparent materials of the protruding part is fully considered, and the refractive index solving precision is improved. In addition, the mass of the added material is solved through the refractive index, so that the accuracy of the concentration of the vehicle urea solution is improved.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling the production of a urea solution for a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a urea solution production apparatus for a vehicle according to an embodiment of the present invention;
fig. 3 is an optical path diagram of refractive index solution in the production control method according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
definition of refractive index: n-c 1/c2, where c1 and c2 represent the speeds of light in different media. For example, if the speed of light in glass is 0.75 times that in a vacuum, the glass has a refractive index of 1.333 relative to vacuum. In the present invention, the refractive index refers to the refractive index of the urea solution for vehicles with respect to air.
The refractive index and the concentration of the urea solution have a corresponding relation at a certain temperature, and the measurement of the refractive index is helpful for assisting in verifying the concentration of the urea solution for vehicles. Of course, refractive index is not a direct process and can affect refractive index if other components are present in the solution. In the production process of the automobile urea solution, enterprises carry out internal supervision for ensuring the quality of the automobile urea solution, and other components cannot be added. And even if other components are added, such as alcohol organic matters in the production of low-temperature urea solution, the refractive index of the urea solution for the internal management and control vehicle is linear, controllable and has reference value.
As shown in fig. 1 to 3, in a first embodiment of the present invention, a method for controlling a urea solution production for a vehicle is provided, the method is used for a urea solution production apparatus for a vehicle to produce a urea solution for a vehicle, the urea solution production apparatus for a vehicle includes a stirring chamber 101, and a stirring device 104 is disposed in the stirring chamber 101; the stirring cavity 101 comprises a convex part 105 with a lateral part transversely provided with a refractive index detection device 106, the bottom and the top of the convex part 105 are flat and shaped, and the bottom and the top of the convex part 105 are made of transparent materials; the refractive index detection device 106 comprises a cavity matched with the convex part 105, a light beam emitting module 1061 arranged at the top of the cavity and a light beam receiving module 1062 arranged at the bottom of the cavity; the first light beam emitted by the light beam emitting module 1061 enters the convex part 105 at an oblique incidence; the first light beam emitted by the light beam emitting module 1061 is transmitted into the convex part 105 of the stirring chamber 101 and received by the light beam receiving module 1062; furthermore, the stir chamber 101 comprises a first material input port 102 and a second material input port 103, and the method comprises:
collecting a first intrinsic offset distance L between a first light beam emitted by the light beam emitting module and a second light beam received by the light beam receiving module when the convex part is in an empty state0(ii) a The empty state is that no vehicle urea solution is in the bulge portion so as to obtain the first intrinsic offset distance; optionally, in the emptying state, the stirring device is in a closed state;
in the production work of the vehicle urea, in response to the stopping of the stirring device, acquiring a second relative offset distance L between a first light beam emitted by the light beam emitting module and a second light beam received by the light beam receiving module, acquiring a first incident angle α of the first light beam, and acquiring the inner height h of the boss;
solving the refractive index n of the vehicle urea; the refractive index satisfies:
Figure BDA0001598841800000061
comparing the refractive index with a preset refractive interval; if the refractive index belongs to the preset refractive interval, executing a first response; if the refractive index does not belong to the preset refractive interval, generating an unfinished instruction for the production of the automotive urea;
in response to the vehicle urea production incomplete command, adding a first material or a second material to the stir chamber.
Optionally, the first response includes, but is not limited to, an audible and visual alert, a vibratory alert, and a program instruction.
In this embodiment, the adding the first material or the second material to the stirring chamber in response to the instruction that the urea production for vehicles is not completed further includes:
adding a first material to the stirring cavity in response to the refractive index being smaller than the minimum value of the preset refractive interval;
or responding to the refractive index being larger than the maximum value of the preset refractive interval, and adding a second material to the stirring cavity.
In this embodiment, the method further includes:
in response to the refractive index being less than the minimum of the preset refractive interval, adding a mass M to the stirring chambernew_1The first material of (a); the above-mentioned
Figure BDA0001598841800000062
Or responding to the refractive index being larger than the maximum value of the preset refractive interval, adding mass M to the stirring cavitynew_2The second material of (a); the above-mentioned
Figure BDA0001598841800000071
Wherein, M isold_allThe total mass of the urea solution for the current vehicle is ηsetA preferred concentration set point for the urea for the vehicle, ηoldη for current concentration value of vehicle ureaoldKn-b; the k satisfies: k is more than or equal to 3 and less than or equal to 7; the b satisfies: b is more than or equal to 4 and less than or equal to 10.
It is worth mentioning that, in the present embodiment, the k and the b can be obtained by detecting the refractive index of each concentration through standard experiments and performing linear regression.
In this embodiment, the urea solution production device for a vehicle further includes a main controller, and the main controller is connected with the opening and closing control end of the stirring device; the response of stopping the stirring device means that the main controller controls the stirring device to be in a closed state.
In another embodiment, the vehicular urea solution production device further comprises a vibration collector mounted on the stirring device and used for collecting the working state of the stirring device.
It is worth mentioning that the operating state includes an on state and an off state.
The vibration collector comprises but is not limited to sonar collection, stirring device deformation collection and sub-sensitive collection so as to know whether the stirring device is in a working state or not.
In this embodiment, the incident angle of the light beam emitted from the light beam emitting module with respect to the convex portion is 5 ° to 85 °.
In this embodiment, the first material is urea for vehicles, and the second material is high purity water.
It is worth mentioning that the flat shaping is to conveniently detect the refractive index of the urea solution for the vehicle when detecting the refractive index, and the bottom and the top of the protruding part are made of transparent materials so that light beams of the refractive index detection device can penetrate through the protruding part.
It is worth mentioning that the light spots of the first light beam and the second light beam are point-shaped or parallel linear.
Optionally, in the production process, the first feeding of the first material and the second material is performed by directly calculating the mixture ratio; and after stirring, detecting the refraction rate, and if the refraction rate is not accordant, feeding so as to realize that the concentration of the produced vehicle urea is proper.
Optionally, in one embodiment, the vehicle urea is at a standard concentration, i.e., ηset32.5% by mass, and in other embodiments η is determined according to internal or local standards of the enterprisesetThe value is obtained.
Optionally, in a specific embodiment, the current concentration of the urea for vehicles can be solved and converted through refractive index, the concentration of the urea solution and the refractive index are approximately in a linear relationship, as shown in table 1, the refractive index of the urea for vehicles with various concentrations is tested under the standard atmospheric pressure of 20 ℃, and a linear regression equation of the refractive index and the concentration, namely η, is obtained through solvingold4.82759 n-6.35083. It is worth mentioning that the national standard GB29518-2013 (urea water for vehicle) indicates that the concentration of urea for vehicle is: 31.8% -33.2%, and the refractive index test data with the concentration of 29.5% -32% are given in table 1, so that on one hand, the first feeding errors of the industrial manufacturing process are all in the range, and meanwhile, the linear regression in the interval is good.
TABLE 1 relationship table of urea concentration and refractive index for vehicle
Concentration of 29.5％ 30.0％ 30.5％ 31.0％ 31.5％ 32.0％
Refractive index 1.3766 1.3777 1.3787 1.3797 1.3808 1.3818
Concentration of 32.5％ 33.0％ 33.5％ 34.0％ 34.5％ 35.0％
Refractive index 1.3829 1.3839 1.3849 1.3860 1.3870 1.3880
In addition, according to different production process temperatures, each factory can test the linear relation between the concentration and the refractive index according to the process conditions.
Optionally, ηoldKn-b; the k satisfies: k is more than or equal to 3 and less than or equal to 7, and b satisfies the following conditions: b is more than or equal to 4 and less than or equal to 10.
It should be noted that, in this embodiment, when the refractive index does not satisfy the preset interval, the first material or the second material needs to be added, and the formula is derived as follows:
when the refractive index is too low, the content of the high-purity urea in the first material is low, and the high-purity urea needs to be added; at this time, the mass M of the first material is newly addednew_1Total mass M of the current materialold_allCurrent vehicle urea concentration ηoldAnd target vehicle urea concentration ηsetSatisfies the following conditions:
Figure BDA0001598841800000091
the above formula is derived:
Figure BDA0001598841800000092
when the refractive index is too low, the content of high-purity water of the second material is low, and high-purity water needs to be added; at this time, the second material mass M is newly addednew_2Total mass M of the current materialold_allCurrent vehicle urea concentration ηoldAnd target vehicle urea concentration ηsetSatisfies the following conditions:
Figure BDA0001598841800000093
the above formula is derived:
Figure BDA0001598841800000094
it is worth mentioning that the total mass M of the current materialold_allMay be obtained by mass measurement.
As shown in fig. 3, an optical path diagram of the refractive index measurement principle is given; in FIG. 2, the optical path S1 is the optical path when the projection is empty, and the optical path S2 is the optical path when the projection is filled with the urea solution for vehicle.
The geometrical optics shows that:
Figure BDA0001598841800000095
the geometrical relationship shows that:
Figure BDA0001598841800000096
d-htan α -L + L is derived from the formula (2)0(3)
Wherein, as shown in fig. 3, D is the length of refraction shift in liquid;
the geometrical relationship shows that:
Figure BDA0001598841800000097
that is to say that the first and second electrodes,
Figure BDA0001598841800000098
substituting formula (5) into (1) can obtain:
Figure BDA0001598841800000099
the above is the derivation of refractive index solution.
It is worth mentioning that, optionally, the beam emitting module emits laser light or infrared light or visible light. Optionally, the light beam receiving module comprises a light receiving array, and the light beam offset distance is determined by the position of the received light beam in the array. Optionally, the light beam receiving module includes a photosensitive panel, and the position of the light beam received by the photosensitive panel is used to remove the light beam offset position.
It is worth mentioning that, optionally, the stirring chamber is provided with a weighing unit so as to obtain the total mass of the vehicle urea in the chamber; optionally, first material pan feeding device is connected to first material pan feeding mouth, first material pan feeding device includes material weighing module and feeding control module, and second material pan feeding device is connected to second material pan feeding mouth, second material pan feeding device includes material weighing module and feeding control module, and the correlation technique refers to automobile-used urea and throws material prior art, and here is no longer repeated.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (8)

1. A production control method of a urea solution for a vehicle is characterized in that the method is used for a urea solution production device for the vehicle to generate the urea solution for the vehicle, the urea solution production device for the vehicle comprises a stirring cavity, and a stirring device is arranged in the stirring cavity; the stirring cavity comprises a protruding part with a lateral part transversely arranged for installing a refractive index detection device, the bottom and the top of the protruding part are flat and shaped, and the bottom and the top of the protruding part are made of transparent materials; the refractive index detection device comprises a concave cavity matched with the convex part, a light beam emitting module arranged at the top of the concave cavity and a light beam receiving module arranged at the bottom of the concave cavity; the first light beam emitted by the light beam emitting module enters the convex part in an oblique incidence mode; the method comprises the following steps:
collecting a first intrinsic offset distance L between a first light beam emitted by the light beam emitting module and a second light beam received by the light beam receiving module when the convex part is in an empty state0；
In the production work of the vehicle urea, in response to the stopping of the stirring device, acquiring a second relative offset distance L between a first light beam emitted by the light beam emitting module and a second light beam received by the light beam receiving module, acquiring a first incident angle α of the first light beam, and acquiring the inner height h of the boss;
solving the refractive index n of the vehicle urea; the refractive index satisfies:
Figure FDA0002526225200000011
comparing the refractive index with a preset refractive interval; if the refractive index belongs to the preset refractive interval, executing a first response; if the refractive index does not belong to the preset refractive interval, generating an unfinished instruction for the production of the automotive urea; the first response is an acousto-optic prompt or a vibration prompt;
in response to the vehicle urea production incomplete command, adding a first material or a second material to the stir chamber.
2. The method for controlling urea solution production for vehicle according to claim 1, wherein said adding a first material or a second material to said agitation chamber in response to said instruction for incomplete urea production for vehicle, further comprises:
adding a first material to the stirring cavity in response to the refractive index being smaller than the minimum value of the preset refractive interval;
or responding to the refractive index being larger than the maximum value of the preset refractive interval, and adding a second material to the stirring cavity.
3. A urea solution production control method for a vehicle according to claim 2, further comprising:
in response to the refractive index being less than the minimum of the preset refractive interval, adding a mass M to the stirring chambernew_1The first material of (a); the above-mentioned
Figure FDA0002526225200000021
Or responding to the refractive index being larger than the maximum value of the preset refractive interval, adding mass M to the stirring cavitynew_2The second material of (a); the above-mentioned
Figure FDA0002526225200000022
Wherein, M isold_allThe total mass of the urea solution for the current vehicle is ηsetA preferred concentration set point for the urea for the vehicle, ηoldη for current concentration value of vehicle ureaoldKn-b; the k satisfies: k is more than or equal to 3 and less than or equal to 7; the b satisfies: b is more than or equal to 4 and less than or equal to 10.
4. The urea solution for vehicle use production control method according to claim 3, wherein k and b are obtained by detecting refractive index of each concentration through standard experiment and performing linear regression.
5. The urea solution production control method for the vehicle as claimed in claim 1, wherein the urea solution production apparatus for the vehicle further comprises a main controller, the main controller is connected with an opening and closing control end of the stirring device; the response of stopping the stirring device means that the main controller controls the stirring device to be in a closed state.
6. The urea solution production control method for vehicles according to claim 1, wherein the urea solution production apparatus for vehicles further comprises a vibration collector mounted on the stirring device for collecting the working state of the stirring device.
7. The urea solution production control method for vehicles as claimed in claim 1, wherein the light beam emitting module emits a light beam having an incident angle of 5 ° to 85 ° with respect to the projection.
8. The method according to claim 1, wherein the first material is urea for vehicles and the second material is high purity water.
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CN108479490B true CN108479490B (en) 2020-07-28

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