CN114704357B - Method and device for determining injection quantity of urea nozzle and vehicle - Google Patents
Method and device for determining injection quantity of urea nozzle and vehicle Download PDFInfo
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- CN114704357B CN114704357B CN202110470380.5A CN202110470380A CN114704357B CN 114704357 B CN114704357 B CN 114704357B CN 202110470380 A CN202110470380 A CN 202110470380A CN 114704357 B CN114704357 B CN 114704357B
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- 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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- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides a method, a device and a vehicle for determining the injection quantity of a urea nozzle, and belongs to the technical field of automobiles. Comprising the following steps: acquiring the current urea demand; determining a compensation coefficient under preset environmental parameters according to the preset environmental parameters; determining a urea injection amount according to the compensation coefficient and the urea demand; and controlling the urea nozzle to spray urea to the gas to be purified according to the urea spray quantity. By means of the method and the device for determining the urea nozzle injection quantity, the urea injection quantity is determined according to the compensation coefficient and the urea demand quantity by determining the compensation coefficient under different environment parameters, and the problem that the tail gas is incompletely purified due to the fact that urea is consumed due to the influence of the environment parameters in the process of urea injection to react with nitrogen oxides is solved.
Description
Technical Field
The embodiment of the application relates to the technical field of automobiles, in particular to a method and device for determining the injection quantity of a urea nozzle and a vehicle.
Background
With the rapid increase of consumption level, automobile consumption has become very popular, but at the same time, environmental pollution and other problems are brought, and how to treat automobile exhaust and reduce pollutant emission has become an important subject of research by various automobile manufacturers.
Nitrogen oxides are one of main pollutants of automobile exhaust, the prior art adopts a selective catalytic reduction technology to reduce the emission of the nitrogen oxides, the catalyst generally adopts urea which is an ammonia carrier, and ammonia in the urea reacts with the nitrogen oxides to generate pollution-free gas, so that the effect of purifying the exhaust is achieved. However, since the urea nozzle is generally mounted on the exhaust pipe and is affected by the exhaust temperature and the cooling water temperature, urea is consumed from the injection to the reaction with nitrogen oxides, and therefore, the urea injection amount and the urea demand amount reacting with nitrogen oxides are different, and this difference eventually causes incomplete purification of nitrogen oxides, and therefore, the urea is consumed from the injection to the reaction with nitrogen oxides due to the influence of environmental parameters, and thus, the exhaust gas purification is incomplete, which is a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the application provides a method, a device and a vehicle for determining the injection quantity of a urea nozzle, and aims to solve the problem that the tail gas is incompletely purified due to the consumption of urea caused by the influence of environmental parameters in the process of urea injection to react with nitrogen oxides.
A first aspect of an embodiment of the present application provides a method for determining an injection amount of a urea nozzle, including:
acquiring the current urea demand;
determining a compensation coefficient under the preset environmental parameters according to the preset environmental parameters;
determining the urea injection quantity according to the compensation coefficient and the urea demand quantity;
and controlling a urea nozzle to spray urea to the gas to be purified according to the urea spray amount.
Optionally, the preset environmental parameter includes an exhaust gas temperature value and/or a cooling water temperature value, and determining the compensation coefficient under the preset environmental parameter according to the preset environmental parameter includes:
and determining a compensation coefficient under preset environmental parameters according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand.
Optionally, determining the compensation coefficient under the preset environmental parameter according to the exhaust gas temperature value and/or the cooling water temperature value and the current urea demand comprises:
under the condition that the preset environmental parameters comprise an exhaust temperature value, determining a compensation coefficient under the exhaust temperature value according to the exhaust temperature value and the current urea demand;
under the condition that the preset environmental parameters comprise cooling water temperature values, determining compensation coefficients under the cooling water temperature values according to the discharged cooling water temperature values and the current urea demand;
in the case where the preset environmental parameters include an exhaust gas temperature value and a cooling water temperature value, the compensation coefficient is determined according to the compensation coefficient at the cooling water temperature value and the compensation coefficient at the exhaust gas temperature value.
Optionally, determining the compensation factor at the exhaust temperature value based on the exhaust temperature value and the current urea demand comprises:
acquiring a pre-stored first compensation coefficient table, wherein the first compensation coefficient table comprises a plurality of different preset urea demands, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demands and the preset exhaust temperature values;
from the first compensation coefficient table, a compensation coefficient is obtained at the exhaust gas temperature value and the current urea demand.
Optionally, determining the compensation coefficient at the cooling water temperature value according to the exhaust cooling water temperature value and the current urea demand comprises:
obtaining a pre-stored second compensation coefficient table, wherein the second compensation coefficient table comprises a plurality of different preset urea demands, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demands and the preset cooling water temperature values;
from the second compensation coefficient table, a compensation coefficient is obtained at the cooling water temperature value and the current urea demand.
A second aspect of the present application provides an apparatus for determining an injection quantity of a urea nozzle, comprising:
a first acquisition module: for obtaining a current urea demand;
a first determination module: the compensation coefficient is used for determining the compensation coefficient under the preset environment parameters according to the preset environment parameters;
a second determination module: the urea injection quantity is determined according to the compensation coefficient and the urea demand quantity;
a first control module: and controlling a urea nozzle to spray urea to the gas to be purified according to the urea spray amount.
Optionally, the preset environmental parameter includes an exhaust gas temperature value and/or a cooling water temperature value, and the first determining module includes:
the first determination submodule: and the compensation coefficient under the preset environmental parameters is determined according to the exhaust gas temperature value and/or the cooling water temperature value and the current urea demand.
Optionally, the first determining submodule includes:
a first determination unit: the compensation coefficient is used for determining the compensation coefficient at the exhaust temperature value according to the exhaust temperature value and the current urea demand under the condition that the preset environmental parameter comprises the exhaust temperature value;
a second determination unit: the compensation coefficient is used for determining the compensation coefficient under the cooling water temperature value according to the exhaust cooling water temperature value and the current urea demand under the condition that the preset environmental parameters comprise the cooling water temperature value;
a third determination unit: for determining a compensation coefficient based on the compensation coefficient at the cooling water temperature value and the compensation coefficient at the exhaust gas temperature value in the case where the preset environmental parameters include the exhaust gas temperature value and the cooling water temperature value.
Optionally, the first determining unit includes:
a first acquisition subunit: the system comprises a first compensation coefficient table, a second compensation coefficient table and a control unit, wherein the first compensation coefficient table is used for acquiring a prestored first compensation coefficient, and comprises a plurality of different preset urea demands, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demands and the preset exhaust temperature values;
a second acquisition subunit: for deriving from the first compensation coefficient table a compensation coefficient at the exhaust gas temperature value and the current urea demand.
A third aspect of the present application provides an automobile provided with an apparatus for determining an injection amount of a urea nozzle as provided in the second aspect of the present application, or comprising a control module for performing a method for determining an injection amount of a urea nozzle as provided in the first aspect of the present application.
The beneficial effects are that:
according to the method, the device and the vehicle for determining the injection quantity of the urea nozzle, firstly, the urea quantity required for purifying the nitrogen oxides in the current environment is obtained, and through presetting different environment parameters, the environment parameters are parameters affecting the urea quantity from urea injection to the reaction of urea and the nitrogen oxides, and the corresponding compensation coefficient under each preset environment parameter is determined; secondly, acquiring current environmental parameters, acquiring corresponding compensation coefficients according to the environmental parameters, and determining urea injection quantity according to the compensation coefficients and urea demand; finally, according to the determined urea injection quantity, the urea nozzle is controlled to spray urea to the gas to be purified according to the determined urea injection quantity, so that the urea quantity reacted with the nitrogen oxides is equal to the urea demand quantity, the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the fact that the urea is consumed due to the influence of environmental parameters in the process of spraying the urea to react with the nitrogen oxides is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of steps of a method for determining an injection amount of a urea nozzle according to an embodiment of the present application;
FIG. 2 is a logic control diagram of a method for determining an injection amount of a urea nozzle according to an embodiment of the present application;
FIG. 3 is a block diagram of an apparatus for determining an injection amount of a urea nozzle according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the related art, the urea nozzle is generally installed on the exhaust pipe, and is affected by the exhaust temperature and the cooling water temperature, urea is consumed in the process from urea injection to the reaction of urea and nitrogen oxides, so that the urea injection amount and the urea demand amount reacted with the nitrogen oxides are different, and the difference eventually causes incomplete purification of the nitrogen oxides, so that the urea is consumed in the process from urea injection to the reaction of the urea and the nitrogen oxides due to the influence of environmental parameters, thereby causing incomplete purification of tail gas, and the technical problem to be solved is urgently.
In view of this, the method for determining the injection quantity of the urea nozzle provided by the present application firstly obtains the urea quantity required for purifying the nitrogen oxides in the current environment, and determines the corresponding compensation coefficient under each preset environmental parameter by presetting different environmental parameters, wherein the environmental parameters are parameters affecting the urea quantity from urea injection to the reaction of urea and nitrogen oxides; secondly, acquiring current environmental parameters, acquiring corresponding compensation coefficients according to the environmental parameters, and determining urea injection quantity according to the compensation coefficients and urea demand; finally, according to the determined urea injection quantity, the urea nozzle is controlled to spray urea to the gas to be purified according to the determined urea injection quantity, so that the urea quantity reacted with the nitrogen oxides is equal to the urea demand quantity, the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the fact that the urea is consumed due to the influence of environmental parameters in the process of spraying the urea to react with the nitrogen oxides is solved.
Example 1
Referring to FIG. 1, there is shown a flow chart of steps of a method of determining an injection amount of a urea nozzle of the present application, as shown in FIG. 1, comprising:
step S1: the current urea demand is obtained.
In this embodiment, the current urea demand refers to the amount of urea required for purifying nitrogen oxides in the current environment, and the current urea demand is calculated according to the temperature of a selective catalytic reduction (Selective Catalytic Reduction, hereinafter referred to as SCR) carrier, the emission amount of nitrogen oxides entering the SCR carrier, and the amount of ammonia adsorbed on the current SCR carrier.
Step S2: and determining a compensation coefficient under the preset environmental parameters according to the preset environmental parameters.
In this embodiment, under a preset environmental parameter, urea is consumed from urea injection to the reaction of urea and nitrogen oxide, so that the urea injection amount and the urea demand amount for the reaction of urea and nitrogen oxide are unequal, the environmental parameter is preset, the actual urea injection amount under the preset environmental parameter is obtained, and the compensation coefficient under the preset environmental parameter is determined according to the actual urea injection amount and the urea demand amount.
Step S3: and determining the urea injection quantity according to the compensation coefficient and the urea demand.
In this embodiment, a current environmental parameter is obtained, a corresponding compensation coefficient is obtained according to the environmental parameter, and then a urea injection amount is determined according to the compensation coefficient and the urea demand.
Step S4: and controlling a urea nozzle to spray urea to the gas to be purified according to the urea spray amount.
According to the determined urea injection quantity, controlling a urea nozzle to spray urea to gas to be purified according to the determined urea injection quantity, wherein the gas to be purified refers to nitrogen oxides in automobile exhaust, the urea is a carrier of ammonia, and the ammonia in the urea reacts with the nitrogen oxides to generate pollution-free gas, so that the effect of purifying the tail gas is achieved.
Firstly, acquiring the urea quantity required by purifying nitrogen oxides in the current environment, and presetting different environment parameters, wherein the environment parameters are parameters affecting the urea quantity from urea injection to the reaction of urea and nitrogen oxides, and determining corresponding compensation coefficients under each preset environment parameter; secondly, acquiring current environmental parameters, acquiring corresponding compensation coefficients according to the environmental parameters, and determining urea injection quantity according to the compensation coefficients and urea demand; finally, according to the determined urea injection quantity, the urea nozzle is controlled to spray urea to the gas to be purified according to the determined urea injection quantity, so that the urea quantity reacted with the nitrogen oxides is equal to the urea demand quantity, the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the fact that the urea is consumed due to the influence of environmental parameters in the process of spraying the urea to react with the nitrogen oxides is solved.
Based on the above method for determining the injection amount of the urea nozzle, the present application provides examples of some specific embodiments, and the examples may be arbitrarily combined to form another method for determining the injection amount of the urea nozzle without contradiction, and it should be understood that, for another method for determining the injection amount of the urea nozzle formed by combining any examples, all the methods fall within the protection scope of the present application.
In a possible embodiment, the preset environmental parameter includes an exhaust gas temperature value and/or a cooling water temperature value, and determining the compensation coefficient under the preset environmental parameter according to the preset environmental parameter includes:
step S21: and determining a compensation coefficient under preset environmental parameters according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand.
The urea nozzle is typically mounted on the exhaust pipe, so that the environmental parameters affecting the amount of urea from the injection to the reaction with nitrogen oxides include an exhaust gas temperature value and/or a cooling water temperature value, i.e. the environmental parameters may include only an exhaust gas temperature value, only a cooling water temperature value, and both. And determining a corresponding compensation coefficient under each preset environmental parameter according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand by presetting different exhaust temperature values and/or cooling water temperature values. By determining the compensation coefficient under different environmental factors, the accuracy of determining the compensation factor is improved, and the urea quantity reacted with the nitrogen oxides can be controlled more accurately to be equal to the urea demand quantity, so that the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the fact that urea is consumed due to the influence of the environmental parameters in the process of spraying the urea to react with the nitrogen oxides is solved.
In a possible embodiment, referring to fig. 2, there is shown a logic control diagram of a method for determining an injection amount of a urea nozzle according to the present application, as shown in fig. 2, determining a compensation coefficient under a preset environmental parameter according to an exhaust gas temperature value and/or a cooling water temperature value, and a current urea demand, including:
step S211: in case the preset environmental parameter comprises an exhaust gas temperature value, a compensation coefficient at the exhaust gas temperature value is determined based on the exhaust gas temperature value and the current urea demand.
The environmental parameters affecting the amount of urea injected from the injection to the reaction with nitrogen oxides include exhaust temperature values, by presetting different exhaust temperature values, corresponding compensation coefficients at each preset exhaust temperature value are determined as a function of the exhaust temperature value and the current urea demand.
Step S212: and under the condition that the preset environmental parameters comprise the cooling water temperature value, determining a compensation coefficient at the cooling water temperature value according to the exhaust cooling water temperature value and the current urea demand.
The environmental parameters affecting the urea quantity from the injection to the reaction with the nitrogen oxides comprise cooling water temperature values, by presetting different cooling water temperature values, corresponding compensation coefficients at each preset cooling water temperature value are determined according to the cooling water temperature value and the current urea demand.
Step S213: in the case where the preset environmental parameters include an exhaust gas temperature value and a cooling water temperature value, the compensation coefficient is determined according to the compensation coefficient at the cooling water temperature value and the compensation coefficient at the exhaust gas temperature value.
In the case where the preset environmental parameter includes the exhaust gas temperature value and the cooling water temperature value, according to the environmental parameter determined in step S211, only the compensation coefficient at the exhaust gas temperature value is included, and according to the environmental parameter determined in step S212, only the compensation coefficient at the cooling water temperature value is included, the product of the two compensation coefficients is the compensation coefficient in the case where the environmental parameter includes the exhaust gas temperature value and the cooling water temperature value.
By determining the compensation coefficient under the condition that the preset environmental parameter only comprises the exhaust temperature value, under the condition that the preset environmental parameter only comprises the cooling water temperature value and under the condition that the preset environmental parameter comprises the exhaust temperature value and the cooling water temperature value, the accuracy of determining the compensation coefficient is improved, and then the urea quantity reacted with the nitrogen oxides can be controlled to be equal to the urea demand more accurately, so that the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the urea consumption caused by the influence of the environmental parameter in the process of spraying urea to react with the nitrogen oxides is solved.
In this embodiment, determining the compensation coefficient at the exhaust temperature value according to the exhaust temperature value and the current urea demand includes:
step S2111: the method comprises the steps of obtaining a pre-stored first compensation coefficient table, wherein the first compensation coefficient table comprises a plurality of different preset urea demands, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demands and the preset exhaust temperature values.
The parameters in the first compensation coefficient table may include a urea demand, an exhaust temperature value, and a compensation coefficient corresponding to the urea demand and the exhaust temperature value; the selection rule of the urea demand in the first compensation coefficient table is as follows: when the urea demand is within the range of 10-100 mg/s, selecting an interval of 10mg/s; selecting an interval of 20mg/s when the urea demand is in the range of 100-200 mg/s, selecting an interval of 50mg/s when the urea demand is in the range of 200-500 mg/s, and selecting an interval of 100mg/s when the urea demand is in the range of 500-1000 mg/s; the range of the preset exhaust temperature value is as follows: the temperature is 0-600 ℃, and the selection interval is 50 ℃.
The urea demand is increased from 10mg/s to 1000mg/s according to a selection rule, the preset exhaust temperature value is increased to 600 ℃ according to a selection interval of 0 ℃, the actual urea injection quantity of each point is obtained, and the compensation coefficient of each preset urea demand and the preset exhaust temperature value can be obtained through the ratio of the actual urea injection quantity to the urea demand, so that the first compensation coefficient table can be calculated.
Step S2112: from the first compensation coefficient table, a compensation coefficient is obtained at the exhaust gas temperature value and the current urea demand.
Accordingly, after the exhaust temperature value and the urea demand in the current environment are obtained, the compensation coefficient under the exhaust temperature value and the urea demand in the environment may be obtained from the first compensation coefficient table.
In a possible embodiment, determining the compensation factor at the cooling water temperature value from the exhaust cooling water temperature value and the current urea demand comprises:
s2121: the method comprises the steps of obtaining a pre-stored second compensation coefficient table, wherein the second compensation coefficient table comprises a plurality of different preset urea demands, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demands and the preset cooling water temperature values.
The parameters in the second compensation coefficient table may include a urea demand amount, a cooling water temperature value, and compensation coefficients corresponding to the preset urea demand amount and the preset cooling water temperature value; the selection rule of the urea demand in the second compensation coefficient table is as follows: when the urea demand is within the range of 10-100 mg/s, selecting an interval of 10mg/s; selecting an interval of 20mg/s when the urea demand is in the range of 100-200 mg/s, selecting an interval of 50mg/s when the urea demand is in the range of 200-500 mg/s, and selecting an interval of 100mg/s when the urea demand is in the range of 500-1000 mg/s; the range of the preset cooling water temperature value is as follows: -10-120 ℃ and the selection interval is 10 ℃.
The urea demand is increased from 10mg/s to 1000mg/s according to a selection rule, the preset cooling water temperature value is increased to 120 ℃ according to a selection interval of-10 ℃, the actual urea injection quantity of each point is obtained, and the compensation coefficient of each preset urea demand and the preset cooling water temperature value can be obtained through the ratio of the actual urea injection quantity to the urea demand, so that the second compensation coefficient table can be calculated.
S2122: from the second compensation coefficient table, a compensation coefficient is obtained at the cooling water temperature value and the current urea demand.
Accordingly, after the cooling water temperature value and the urea demand in the current environment are obtained, the compensation coefficient under the cooling water temperature value and the urea demand in the environment can be obtained from the second compensation coefficient table.
Example two
Based on the same inventive concept, another embodiment of the present application provides an apparatus for determining an injection amount of a urea nozzle, for performing the method for determining an injection amount of a urea nozzle as provided in embodiment one of the present application; referring to fig. 3, there is shown a block diagram of an apparatus for determining an injection amount of urea nozzle according to the present application, including, as shown in fig. 3:
the first acquisition module 11: for obtaining a current urea demand;
the first determination module 12: the compensation coefficient is used for determining the compensation coefficient under the preset environment parameters according to the preset environment parameters;
the second determination module 13: the urea injection quantity is determined according to the compensation coefficient and the urea demand quantity;
the first control module 14: and controlling a urea nozzle to spray urea to the gas to be purified according to the urea spray amount.
The device for determining the injection quantity of the urea nozzle provided by the application comprises the steps that firstly, a first acquisition module 11 acquires the urea quantity required for purifying nitrogen oxides in the current environment, and a first determination module 12 determines a corresponding compensation coefficient under each preset environment parameter by presetting different environment parameters, wherein the environment parameters are parameters affecting the urea quantity from urea injection to urea reaction with the nitrogen oxides; secondly, acquiring current environmental parameters, acquiring corresponding compensation coefficients according to the environmental parameters, and then determining urea injection quantity by a second determining module 13 according to the compensation coefficients and urea demand; finally, the first control module 14 controls the urea nozzle to spray urea to the gas to be purified according to the determined urea spraying amount, so that the urea amount reacted with the nitrogen oxides is equal to the urea demand, thereby achieving the technical effect of completely purifying the gas to be purified, and solving the problem that the tail gas is incompletely purified due to the consumption of urea caused by the influence of environmental parameters in the process of spraying urea to react with the nitrogen oxides.
In one possible embodiment, the preset environmental parameters include an exhaust gas temperature value and/or a cooling water temperature value, and the first determining module 12 includes:
the first determination submodule 121: and the compensation coefficient under the preset environmental parameters is determined according to the exhaust gas temperature value and/or the cooling water temperature value and the current urea demand.
The urea nozzle is typically mounted on the exhaust pipe, so that the environmental parameters affecting the amount of urea from the injection to the reaction with nitrogen oxides include an exhaust gas temperature value and/or a cooling water temperature value, i.e. the environmental parameters may include only an exhaust gas temperature value, only a cooling water temperature value, and both. And determining a corresponding compensation coefficient under each preset environmental parameter according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand by presetting different exhaust temperature values and/or cooling water temperature values. By determining the compensation coefficient under different environmental factors, the accuracy of determining the compensation factor is improved, and the urea quantity reacted with the nitrogen oxides can be controlled more accurately to be equal to the urea demand quantity, so that the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the fact that urea is consumed due to the influence of the environmental parameters in the process of spraying the urea to react with the nitrogen oxides is solved.
In one possible embodiment, the first determining sub-module 121 includes:
the first determination unit 1211: the compensation coefficient is used for determining the compensation coefficient at the exhaust temperature value according to the exhaust temperature value and the current urea demand under the condition that the preset environmental parameter comprises the exhaust temperature value;
the second determination unit 1212: the compensation coefficient is used for determining the compensation coefficient under the cooling water temperature value according to the exhaust cooling water temperature value and the current urea demand under the condition that the preset environmental parameters comprise the cooling water temperature value;
the third determination unit 1213: for determining a compensation coefficient based on the compensation coefficient at the cooling water temperature value and the compensation coefficient at the exhaust gas temperature value in the case where the preset environmental parameters include the exhaust gas temperature value and the cooling water temperature value.
By determining the compensation coefficient under the condition that the preset environmental parameter only comprises the exhaust temperature value, under the condition that the preset environmental parameter only comprises the cooling water temperature value and under the condition that the preset environmental parameter comprises the exhaust temperature value and the cooling water temperature value, the accuracy of determining the compensation coefficient is improved, and then the urea quantity reacted with the nitrogen oxides can be controlled to be equal to the urea demand more accurately, so that the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the urea consumption caused by the influence of the environmental parameter in the process of spraying urea to react with the nitrogen oxides is solved.
In one possible embodiment, the first determining unit 1211 includes:
the first acquisition subunit 12111: the system comprises a first compensation coefficient table, a second compensation coefficient table and a control unit, wherein the first compensation coefficient table is used for acquiring a prestored first compensation coefficient, and comprises a plurality of different preset urea demands, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demands and the preset exhaust temperature values;
the second acquisition subunit 12112: for deriving from the first compensation coefficient table a compensation coefficient at the exhaust gas temperature value and the current urea demand.
The selection rule of the urea demand in the first compensation coefficient table is as follows: when the urea demand is within the range of 10-100 mg/s, selecting an interval of 10mg/s; selecting an interval of 20mg/s when the urea demand is in the range of 100-200 mg/s, selecting an interval of 50mg/s when the urea demand is in the range of 200-500 mg/s, and selecting an interval of 100mg/s when the urea demand is in the range of 500-1000 mg/s; the range of the preset exhaust temperature value is as follows: the temperature is 0-600 ℃, and the selection interval is 50 ℃.
The urea demand is increased from 10mg/s to 1000mg/s according to a selection rule, the preset exhaust temperature value is increased to 600 ℃ according to a selection interval of 0 ℃, the actual urea injection quantity of each point is obtained, and the compensation coefficient of each preset urea demand and the preset exhaust temperature value can be obtained through the ratio of the actual urea injection quantity to the urea demand, so that the first compensation coefficient table can be calculated.
Accordingly, after the exhaust temperature value and the urea demand in the current environment are obtained, the compensation coefficient under the exhaust temperature value and the urea demand in the environment may be obtained from the first compensation coefficient table.
In one possible embodiment, the first determining unit 1211 includes:
the first acquisition subunit 12113: the system comprises a first compensation coefficient table, a second compensation coefficient table and a control unit, wherein the first compensation coefficient table is used for acquiring a pre-stored second compensation coefficient, and comprises a plurality of different preset urea demands, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demands and the preset cooling water temperature values;
the second acquisition subunit 12114: for deriving from the second compensation coefficient table a compensation coefficient at the cooling water temperature value and the current urea demand.
The selection rule of the urea demand in the second compensation coefficient table is as follows: when the urea demand is within the range of 10-100 mg/s, selecting an interval of 10mg/s; selecting an interval of 20mg/s when the urea demand is in the range of 100-200 mg/s, selecting an interval of 50mg/s when the urea demand is in the range of 200-500 mg/s, and selecting an interval of 100mg/s when the urea demand is in the range of 500-1000 mg/s; the range of the preset cooling water temperature value is as follows: -10-120 ℃ and the selection interval is 10 ℃.
The urea demand is increased from 10mg/s to 1000mg/s according to a selection rule, the preset cooling water temperature value is increased to 120 ℃ according to a selection interval of-10 ℃, the actual urea injection quantity of each point is obtained, and the compensation coefficient of each preset urea demand and the preset cooling water temperature value can be obtained through the ratio of the actual urea injection quantity to the urea demand, so that the second compensation coefficient table can be calculated.
Accordingly, after the cooling water temperature value and the urea demand in the current environment are obtained, the compensation coefficient under the cooling water temperature value and the urea demand in the environment can be obtained from the second compensation coefficient table.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
Example III
The embodiment of the application also provides an automobile, which can comprise the device for determining the injection quantity of the urea nozzle provided by the second embodiment of the application, or comprises a control module, wherein the control module is used for executing the method for determining the injection quantity of the urea nozzle provided by the first embodiment of the application.
According to the automobile provided by the application, firstly, the urea quantity required for purifying the nitrogen oxides in the current environment is obtained, and different environment parameters are preset, wherein the environment parameters are parameters affecting the urea quantity from urea injection to the reaction of urea and the nitrogen oxides, and the corresponding compensation coefficient under each preset environment parameter is determined; secondly, acquiring current environmental parameters, acquiring corresponding compensation coefficients according to the environmental parameters, and determining urea injection quantity according to the compensation coefficients and urea demand; finally, according to the determined urea injection quantity, the urea nozzle is controlled to spray urea to the gas to be purified according to the determined urea injection quantity, so that the urea quantity reacted with the nitrogen oxides is equal to the urea demand quantity, the technical effect of completely purifying the gas to be purified is achieved, and the problem that the tail gas is incompletely purified due to the fact that the urea is consumed due to the influence of environmental parameters in the process of spraying the urea to react with the nitrogen oxides is solved.
It should be understood that while the present specification has described preferred embodiments of the present embodiments, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the present application.
The above detailed description of a method, an apparatus and an automobile for determining the injection amount of a urea nozzle provided in the present application applies specific examples to illustrate the principles and embodiments of the present application, and the above examples are only used to help understand the method and core ideas of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (10)
1. A method of determining an injection amount of a urea nozzle, the method comprising:
acquiring the current urea demand;
according to a preset environmental parameter, determining a compensation coefficient under the preset environmental parameter comprises: acquiring an actual urea injection quantity under a preset environmental parameter according to the preset environmental parameter, and determining a compensation coefficient under the preset environmental parameter according to the actual urea injection quantity and the urea demand, wherein the preset environmental parameter comprises an exhaust temperature value and/or a cooling water temperature value;
determining a urea injection amount according to the compensation coefficient and the urea demand;
and controlling the urea nozzle to spray urea to the gas to be purified according to the urea spray quantity.
2. The method of claim 1, wherein determining the compensation factor for the preset environmental parameter based on the preset environmental parameter comprises:
and determining a compensation coefficient under the preset environmental parameter according to the exhaust gas temperature value and/or the cooling water temperature value and the current urea demand.
3. The method according to claim 2, wherein determining the compensation factor for the preset environmental parameter based on the exhaust gas temperature value and/or the cooling water temperature value, and the current urea demand, comprises:
determining a compensation coefficient at the exhaust temperature value according to the exhaust temperature value and the current urea demand when the preset environmental parameter comprises the exhaust temperature value;
under the condition that the preset environmental parameters comprise the cooling water temperature value, determining a compensation coefficient under the cooling water temperature value according to the cooling water temperature value and the current urea demand;
and under the condition that the preset environmental parameters comprise the exhaust gas temperature value and the cooling water temperature value, determining the compensation coefficient according to the compensation coefficient at the cooling water temperature value and the compensation coefficient at the exhaust gas temperature value.
4. A method according to claim 3, wherein determining a compensation factor at the exhaust temperature value based on the exhaust temperature value and the current urea demand comprises:
acquiring a pre-stored first compensation coefficient table, wherein the first compensation coefficient table comprises a plurality of different preset urea demands, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demands and the preset exhaust temperature values;
from the first compensation coefficient table, a compensation coefficient at the exhaust gas temperature value and the current urea demand is obtained.
5. A method according to claim 3, wherein determining a compensation factor for the cooling water temperature value based on the cooling water temperature value and the current urea demand comprises:
obtaining a pre-stored second compensation coefficient table, wherein the second compensation coefficient table comprises a plurality of different preset urea demands, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demands and the preset cooling water temperature values;
and acquiring a compensation coefficient under the cooling water temperature value and the current urea demand from the second compensation coefficient table.
6. An apparatus for determining the injection quantity of a urea nozzle, said apparatus comprising:
a first acquisition module: for obtaining a current urea demand;
a first determination module: the method for determining the compensation coefficient under the preset environmental parameters according to the preset environmental parameters comprises the following steps: acquiring an actual urea injection quantity under a preset environmental parameter according to the preset environmental parameter, and determining a compensation coefficient under the preset environmental parameter according to the actual urea injection quantity and the urea demand, wherein the preset environmental parameter comprises an exhaust temperature value and/or a cooling water temperature value;
a second determination module: the urea injection quantity is determined according to the compensation coefficient and the urea demand quantity;
a first control module: and controlling the urea nozzle to spray urea to the gas to be purified according to the urea spray quantity.
7. The apparatus of claim 6, wherein the first determination module comprises:
the first determination submodule: and the compensation coefficient under the preset environmental parameters is determined according to the exhaust gas temperature value and/or the cooling water temperature value and the current urea demand.
8. The apparatus of claim 7, wherein the first determination submodule comprises:
a first determination unit: the compensation coefficient is used for determining the compensation coefficient at the exhaust temperature value according to the exhaust temperature value and the current urea demand when the preset environmental parameter comprises the exhaust temperature value;
a second determination unit: the compensation coefficient is used for determining the compensation coefficient at the cooling water temperature value according to the cooling water temperature value and the current urea demand when the preset environmental parameter comprises the cooling water temperature value;
a third determination unit: and determining the compensation coefficient according to the compensation coefficient at the cooling water temperature value and the compensation coefficient at the exhaust gas temperature value when the preset environmental parameter comprises the exhaust gas temperature value and the cooling water temperature value.
9. The apparatus of claim 8, wherein the first determining unit comprises:
a first acquisition subunit: the system comprises a first compensation coefficient table, a second compensation coefficient table and a control unit, wherein the first compensation coefficient table is used for acquiring a prestored first compensation coefficient, and comprises a plurality of different preset urea demands, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demands and the preset exhaust temperature values;
a second acquisition subunit: for deriving from said first compensation coefficient table a compensation coefficient at said exhaust gas temperature value and said current urea demand.
10. An automobile, characterized in that it is provided with an apparatus for determining the injection quantity of a urea nozzle according to any one of claims 6-9, or that it comprises a control module for executing the method for determining the injection quantity of a urea nozzle according to any one of claims 1-5.
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