CN114704357A - 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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- CN114704357A CN114704357A CN202110470380.5A CN202110470380A CN114704357A CN 114704357 A CN114704357 A CN 114704357A CN 202110470380 A CN202110470380 A CN 202110470380A CN 114704357 A CN114704357 A CN 114704357A
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- urea
- temperature value
- compensation coefficient
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- cooling water
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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
Abstract
The application provides a method and a device for determining the injection quantity of a urea nozzle and a vehicle, and belongs to the technical field of automobiles. The method comprises the following steps: acquiring the current urea demand; determining a compensation coefficient under a preset environment parameter according to the preset environment parameter; determining the urea injection quantity 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 injection quantity. By using the method and the device for determining the injection quantity of the urea nozzle, the compensation coefficient under different environmental parameters is determined, and the urea injection quantity is determined according to the compensation coefficient and the urea demand, so that the problem of incomplete tail gas purification caused by consumption of urea due to the influence of environmental parameters in the process from the urea injection to the reaction 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 a 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, problems such as environmental pollution are brought, and how to treat automobile exhaust and reduce pollutant emission becomes an important subject for research of various automobile manufacturers.
Nitrogen oxide is one of the main pollutants of automobile exhaust, the prior art adopts a selective catalytic reduction technology to reduce the emission of the nitrogen oxide, a catalyst generally adopts urea, the urea is an ammonia carrier, and ammonia in the urea reacts with the nitrogen oxide to generate pollution-free gas, so that the effect of purifying the exhaust is achieved. However, since the urea nozzle is generally installed in the exhaust pipe and is consumed in the process from the urea injection to the reaction with the nitrogen oxide due to the influence of the exhaust temperature and the cooling water temperature, the difference between the urea injection amount and the required amount of urea reacting with the nitrogen oxide may eventually result in incomplete purification of the nitrogen oxide, and therefore, the urea injection to the reaction with the nitrogen oxide may consume due to the influence of environmental parameters, resulting in incomplete purification of the exhaust gas, which is a technical problem to be solved.
Disclosure of Invention
The embodiment of the application aims to provide a method, a device and a vehicle for determining the injection quantity of a urea nozzle, and aims to solve the problem that in the process from urea injection to reaction with nitrogen oxides, urea is consumed due to the influence of environmental parameters, so that exhaust gas purification is incomplete.
In a first aspect, 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 parameter according to the preset environmental parameter;
determining the urea injection quantity according to the compensation coefficient and the urea demand;
and controlling a urea nozzle to spray urea to the gas to be purified according to the urea injection quantity.
Optionally, the preset environmental parameter includes an exhaust temperature value and/or a cooling water temperature value, and the determining, according to the preset environmental parameter, a compensation coefficient under the preset environmental parameter includes:
and determining a compensation coefficient under a preset environmental parameter according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand.
Optionally, determining a compensation coefficient under a preset environmental parameter according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand, including:
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 a cooling water temperature value, determining a compensation coefficient under the cooling water temperature value according to a discharged cooling water temperature value and the current urea demand;
and under the condition that the preset environmental parameters comprise an exhaust temperature value and a cooling water temperature value, determining a compensation coefficient according to a compensation coefficient under the cooling water temperature value and a compensation coefficient under the exhaust temperature value.
Optionally, determining a compensation coefficient at the exhaust temperature value according to the exhaust temperature value and the current urea demand, including:
acquiring a prestored first compensation coefficient table, wherein the first compensation coefficient table comprises a plurality of different preset urea demand quantities, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demand quantities and the preset exhaust temperature values;
from the first compensation factor table, a compensation factor at an exhaust temperature value and a current urea demand is obtained.
Optionally, determining a compensation coefficient under the cooling water temperature value according to the exhaust cooling water temperature value and the current urea demand, comprising:
acquiring a pre-stored second compensation coefficient table, wherein the second compensation coefficient table comprises a plurality of different preset urea demand quantities, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demand quantities and the preset cooling water temperature values;
from the second compensation coefficient table, a compensation coefficient at the cooling water temperature value and the current urea demand is obtained.
A second aspect of the present application provides an apparatus for determining an injection amount of a urea nozzle, comprising:
a first acquisition module: for obtaining the current urea demand;
a first determination module: the compensation module is used for determining a compensation coefficient under a preset environment parameter according to the preset environment parameter;
a second determination module: the urea injection quantity is determined according to the compensation coefficient and the urea demand;
a first control module: and controlling a urea nozzle to spray urea to the gas to be purified according to the urea injection quantity.
Optionally, the preset environmental parameter comprises an exhaust temperature value and/or a cooling water temperature value, and the first determining module comprises:
a first determination sub-module: and the compensation coefficient under the preset environmental parameters is determined according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand.
Optionally, the first determining sub-module includes:
a first determination unit: the method comprises the steps that under the condition that preset environmental parameters comprise an exhaust temperature value, a compensation coefficient under the exhaust temperature value is determined according to the exhaust temperature value and the current urea demand;
a second determination unit: the method comprises the steps that under the condition that a preset environment parameter comprises a cooling water temperature value, a compensation coefficient under the cooling water temperature value is determined according to a discharged cooling water temperature value and the current urea demand;
a third determination unit: and the compensation coefficient is determined according to the compensation coefficient under the temperature value of the cooling water and the compensation coefficient under the temperature value of the exhaust gas under the condition that the preset environmental parameters comprise the temperature value of the exhaust gas and the temperature value of the cooling water.
Optionally, the first determination 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 table, and comprises a plurality of different preset urea demand quantities, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demand quantities and the preset exhaust temperature values;
a second acquisition subunit: and the controller is used for acquiring a compensation coefficient under the exhaust temperature value and the current urea demand from the first compensation coefficient table.
A third aspect of the present application provides a vehicle provided with an apparatus for determining an injection amount of a urea injector 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 injector as provided in the first aspect of the present application.
Has the advantages that:
according to the method, the device and the vehicle for determining the injection quantity of the urea nozzle, the urea quantity required for purifying nitrogen oxides in the current environment is obtained, and the corresponding compensation coefficient under each preset environment parameter is determined by presetting different environment parameters, wherein the environment parameters are parameters influencing 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 determining urea injection quantity according to the compensation coefficients and urea demand; and finally, according to the determined urea injection quantity, controlling a urea nozzle to spray urea to the gas to be purified according to the determined urea injection quantity so as to enable the urea quantity reacted with the nitrogen oxides to be equal to the required urea quantity, thereby achieving the technical effect of completely purifying the gas to be purified, and solving the problem of incomplete tail gas purification caused by consumption of urea due to the influence of environmental parameters in the process from the urea injection to the reaction with the nitrogen oxides.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart illustrating 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 quantity 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 technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the related art, a urea nozzle is generally installed on an exhaust pipe, and is affected by the temperature of exhaust gas and the temperature of cooling water, and urea is consumed from urea injection to the process of reaction of urea and nitrogen oxides, so that the difference between the urea injection amount and the urea demand amount for reaction with nitrogen oxides finally results in incomplete purification of nitrogen oxides.
In view of this, the method for determining the injection amount of the urea nozzle provided by the present application first obtains the urea amount required for purifying the nitrogen oxide in the current environment, and determines the corresponding compensation coefficient under each preset environmental parameter by presetting different environmental parameters, where the environmental parameters are parameters that affect the urea amount from urea injection to the reaction of urea and nitrogen oxide; 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; and finally, according to the determined urea injection quantity, controlling a urea nozzle to spray urea to the gas to be purified according to the determined urea injection quantity so as to enable the urea quantity reacted with the nitrogen oxides to be equal to the required urea quantity, thereby achieving the technical effect of completely purifying the gas to be purified, and solving the problem of incomplete tail gas purification caused by consumption of urea due to the influence of environmental parameters in the process from the urea injection to the reaction with the nitrogen oxides.
Example one
Referring to FIG. 1, a flowchart illustrating steps of a method of determining an injection amount of a urea nozzle according to the present application is shown, where as shown in FIG. 1, the method of determining an injection amount of a urea nozzle comprises:
step S1: the current urea demand is obtained.
In this embodiment, the current urea demand is a urea amount required for purifying nitrogen oxides in the current environment, and the current urea demand is calculated according to a temperature of a Selective Catalytic Reduction (SCR) carrier, a discharge amount of nitrogen oxides entering the SCR carrier, and an amount of ammonia adsorbed on the current SCR carrier.
Step S2: and determining a compensation coefficient under the preset environmental parameter according to the preset environmental parameter.
In this embodiment, under the preset environmental parameter, urea is consumed in the process from urea injection to urea reaction with nitrogen oxide, and therefore, the urea injection amount and the urea demand amount for urea reaction with nitrogen oxide are not equal, the actual urea injection amount under the preset environmental parameter is obtained by presetting the environmental parameter, and the compensation coefficient under the preset environmental parameter is determined according to the actual urea injection amount and the actual urea demand amount.
Step S3: and determining the urea injection quantity according to the compensation coefficient and the urea demand.
In this embodiment, the current environmental parameter is obtained, the corresponding compensation coefficient is obtained according to the environmental parameter, and then the 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 injection quantity.
And controlling a urea nozzle to spray urea to the gas to be purified according to the determined urea injection quantity, wherein the gas to be purified is nitrogen oxide in automobile exhaust, the urea is a carrier of ammonia, and the ammonia in the urea reacts with the nitrogen oxide to generate pollution-free gas, so that the effect of purifying the exhaust is achieved.
According to the method for determining the injection quantity of the urea nozzle, the urea quantity required for purifying nitrogen oxides in the current environment is obtained, and corresponding compensation coefficients under each preset environment parameter are determined by presetting different environment parameters, wherein the environment parameters are parameters influencing the urea quantity from urea injection to 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; and finally, according to the determined urea injection quantity, controlling a urea nozzle to spray urea to the gas to be purified according to the determined urea injection quantity so as to enable the urea quantity reacted with the nitrogen oxide to be equal to the required urea quantity, thereby achieving the technical effect of completely purifying the gas to be purified, and solving the problem of incomplete tail gas purification caused by consumption of urea due to the influence of environmental parameters in the process from the urea injection to the reaction with the nitrogen oxide.
Based on the above method for determining the injection quantity of the urea nozzle, the present application provides the following specific examples, and the examples can be combined arbitrarily to form another method for determining the injection quantity of the urea nozzle without conflict, and it should be understood that the method for determining the injection quantity of the urea nozzle formed by combining any of the examples falls within the protection scope of the present application.
In a possible embodiment, the determining the compensation coefficient under the preset environmental parameter according to the preset environmental parameter includes:
step S21: and determining a compensation coefficient under a preset environmental parameter according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand.
The urea nozzle is generally mounted on the exhaust pipe, and therefore, the environmental parameters influencing the urea amount from the urea injection to the urea reaction with the nitrogen oxides include an exhaust temperature value and/or a cooling water temperature value, namely, the environmental parameters may include only an exhaust temperature value, only a cooling water temperature value, and also include both an exhaust temperature value and a cooling water temperature value. And determining a corresponding compensation coefficient under each preset environmental parameter according to the preset exhaust temperature value and/or 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 coefficients under different environmental factors, the accuracy of determining the compensation factors is improved, and further the urea quantity reacting with the nitrogen oxides can be more accurately controlled 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 exhaust gas is incompletely purified due to the consumption of urea caused by the influence of environmental parameters in the process from the spraying of the urea to the reaction of the urea with the nitrogen oxides is solved.
In one possible embodiment, referring to fig. 2, a logic control diagram of a method for determining an injection amount of a urea injection nozzle according to the present application is shown, and as shown in fig. 2, determining a compensation coefficient under a preset environmental parameter according to an exhaust temperature value and/or a cooling water temperature value and a current urea demand includes:
step S211: and 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.
The environmental parameters influencing the urea amount from the urea injection to the urea reaction with the nitrogen oxide comprise exhaust temperature values, and corresponding compensation coefficients under each preset exhaust temperature value are determined according to the exhaust temperature values and the current urea demand amount through presetting different exhaust temperature values.
Step S212: and 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 exhaust cooling water temperature value and the current urea demand.
The environmental parameters influencing the urea amount from the urea injection to the urea reaction with the nitrogen oxide comprise cooling water temperature values, and corresponding compensation coefficients under each preset cooling water temperature value are determined according to the cooling water temperature values and the current urea demand through presetting different cooling water temperature values.
Step S213: and under the condition that the preset environmental parameters comprise an exhaust temperature value and a cooling water temperature value, determining a compensation coefficient according to a compensation coefficient under the cooling water temperature value and a compensation coefficient under the exhaust temperature value.
Under the condition that the preset environmental parameters comprise the exhaust temperature value and the cooling water temperature value, the environmental parameters determined in the step S211 only comprise the compensation coefficient under the exhaust temperature value, and the environmental parameters determined in the step S212 only comprise the compensation coefficient under the cooling water temperature value, wherein the product of the two compensation coefficients is the compensation coefficient under the condition that the environmental parameters comprise the exhaust temperature value and the cooling water temperature value.
By determining the compensation coefficients under the conditions that the preset environmental parameters only comprise the exhaust temperature value, the cooling water temperature value and the exhaust temperature value and the cooling water temperature value, the accuracy of determining the compensation coefficients is improved, the urea amount reacting with the nitrogen oxide can be more accurately controlled to be equal to the urea demand amount, the technical effect of completely purifying the gas to be purified is achieved, and the problem that the exhaust gas is incompletely purified due to the consumption of the urea caused by the influence of the environmental parameters in the process that the urea is sprayed to react with the nitrogen oxide is solved.
In this embodiment, determining a 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 demand quantities, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demand quantities and the preset exhaust temperature values.
The parameters in the first compensation coefficient table may include urea demand, exhaust temperature values, and corresponding compensation coefficients under a preset urea demand and a preset 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 the interval of 10 mg/s; selecting the interval to be 20mg/s when the urea demand is within the range of 100-200 mg/s, selecting the interval to be 50mg/s when the urea demand is within the range of 200-500 mg/s, and selecting the interval to be 100mg/s when the urea demand is within the range of 500-1000 mg/s; the preset exhaust temperature value range is as follows: 0-600 ℃ and the selected 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, the compensation coefficient under each preset urea demand and the preset exhaust temperature value can be obtained according to the ratio of the actual urea injection quantity to the urea demand, and therefore a first compensation coefficient table can be obtained through calculation.
Step S2112: from the first compensation coefficient table, a compensation coefficient at an exhaust temperature value and a current urea demand is obtained.
Accordingly, after the exhaust temperature value and the urea demand under the current environment are obtained, the compensation coefficient under the exhaust temperature value and the urea demand under the environment can be obtained from the first compensation coefficient table.
In one possible embodiment, determining a compensation factor for the cooling water temperature value based on the exhaust cooling water temperature value and the current urea demand includes:
s2121: and acquiring a pre-stored second compensation coefficient table, wherein the second compensation coefficient table comprises a plurality of different preset urea demand quantities, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demand quantities and the preset cooling water temperature values.
The parameters in the second compensation coefficient table may include urea demand, cooling water temperature values, and corresponding compensation coefficients at preset urea demand and preset cooling water temperature values; 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 the interval of 10 mg/s; selecting the interval to be 20mg/s when the urea demand is within the range of 100-200 mg/s, selecting the interval to be 50mg/s when the urea demand is within the range of 200-500 mg/s, and selecting the interval to be 100mg/s when the urea demand is within the range of 500-1000 mg/s; the preset cooling water temperature value range is as follows: -10 to 120 ℃ and with a spacing of 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 under each preset urea demand and the preset cooling water temperature value can be obtained according to the ratio of the actual urea injection quantity to the urea demand, so that a second compensation coefficient table can be obtained through calculation.
S2122: from the second compensation coefficient table, a compensation coefficient at the cooling water temperature value and the current urea demand is obtained.
Accordingly, after the cooling water temperature value and the urea demand under the current environment are obtained, the cooling water temperature value and the compensation coefficient under the urea demand under 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 a device for determining an injection quantity of a urea nozzle, which is used for executing the method for determining the injection quantity of the urea nozzle provided by the first embodiment of the present application; referring to fig. 3, a block diagram of the apparatus for determining the injection amount of the urea nozzle according to the present application is shown, and as shown in fig. 3, the apparatus includes:
the first acquisition module 11: for obtaining the current urea demand;
the first determination module 12: the compensation module is used for determining a compensation coefficient under a preset environment parameter according to the preset environment parameter;
the second determination module 13: the urea injection quantity is determined according to the compensation coefficient and the urea demand;
the first control module 14: and controlling a urea nozzle to spray urea to the gas to be purified according to the urea injection quantity.
According to the device for determining the injection quantity of the urea nozzle, firstly, a first obtaining module 11 obtains the urea quantity required by purifying nitrogen oxides in the current environment, and a first determining module 12 determines a corresponding compensation coefficient under each preset environment parameter by presetting different environment parameters, wherein the environment parameters are parameters influencing the urea quantity from urea injection to the reaction of urea and nitrogen oxides; secondly, acquiring a current environmental parameter, acquiring a corresponding compensation coefficient according to the environmental parameter, and then determining the urea injection amount by a second determining module 13 according to the compensation coefficient and the 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 injection amount, so that the urea amount reacting with the nitrogen oxide is equal to the urea demand, thereby achieving the technical effect of completely purifying the gas to be purified, and solving the problem of incomplete tail gas purification caused by consumption of urea due to the influence of environmental parameters in the process from the urea injection to the reaction with the nitrogen oxide.
In a possible embodiment, the preset environmental parameters comprise an exhaust temperature value and/or a cooling water temperature value, and the first determination module 12 comprises:
the first determination sub-module 121: and the compensation coefficient under the preset environmental parameters is determined according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand.
The urea nozzle is generally mounted on the exhaust pipe, and therefore, the environmental parameters influencing the urea amount from the urea injection to the urea reaction with the nitrogen oxides include an exhaust temperature value and/or a cooling water temperature value, namely, the environmental parameters may include only an exhaust temperature value, only a cooling water temperature value, and also include both an exhaust temperature value and a cooling water temperature value. And determining a corresponding compensation coefficient under each preset environmental parameter according to the preset exhaust temperature value and/or 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 coefficients under different environmental factors, the accuracy of determining the compensation factors is improved, and further the urea quantity reacting with the nitrogen oxides can be more accurately controlled 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 exhaust gas is incompletely purified due to the consumption of urea caused by the influence of environmental parameters in the process from the spraying of the urea to the reaction of the urea with the nitrogen oxides is solved.
In one possible implementation, the first determining submodule 121 includes:
the first determination unit 1211: the method comprises the steps that under the condition that preset environmental parameters comprise an exhaust temperature value, a compensation coefficient under the exhaust temperature value is determined according to the exhaust temperature value and the current urea demand;
the second determination unit 1212: the method comprises the steps that under the condition that a preset environment parameter comprises a cooling water temperature value, a compensation coefficient under the cooling water temperature value is determined according to a discharged cooling water temperature value and the current urea demand;
the third determination unit 1213: and the compensation coefficient is determined according to the compensation coefficient under the temperature value of the cooling water and the compensation coefficient under the temperature value of the exhaust gas under the condition that the preset environmental parameters comprise the temperature value of the exhaust gas and the temperature value of the cooling water.
By determining the compensation coefficients under the conditions that the preset environmental parameters only comprise the exhaust temperature value, the cooling water temperature value and the exhaust temperature value and the cooling water temperature value, the accuracy of determining the compensation coefficients is improved, the urea amount reacting with the nitrogen oxide can be more accurately controlled to be equal to the urea demand amount, the technical effect of completely purifying the gas to be purified is achieved, and the problem that the exhaust gas is incompletely purified due to the consumption of the urea caused by the influence of the environmental parameters in the process that the urea is sprayed to react with the nitrogen oxide is solved.
In a possible implementation, 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 table, and comprises a plurality of different preset urea demand quantities, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demand quantities and the preset exhaust temperature values;
second acquisition subunit 12112: for obtaining from the first compensation factor table a compensation factor at the exhaust 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 the interval of 10 mg/s; selecting the interval to be 20mg/s when the urea demand is within the range of 100-200 mg/s, selecting the interval to be 50mg/s when the urea demand is within the range of 200-500 mg/s, and selecting the interval to be 100mg/s when the urea demand is within the range of 500-1000 mg/s; the preset exhaust temperature value range is as follows: 0-600 ℃ and the selected 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, the compensation coefficient under each preset urea demand and the preset exhaust temperature value can be obtained according to the ratio of the actual urea injection quantity to the urea demand, and therefore a first compensation coefficient table can be obtained through calculation.
Accordingly, after the exhaust temperature value and the urea demand under the current environment are obtained, the compensation coefficient under the exhaust temperature value and the urea demand under the environment can be obtained from the first compensation coefficient table.
In a possible implementation, 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 table, and the second compensation coefficient table comprises a plurality of different preset urea demand quantities, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demand quantities and the preset cooling water temperature values;
the second acquisition subunit 12114: and the controller is used for acquiring a compensation coefficient under the cooling water temperature value and the current urea demand from the second compensation coefficient table.
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 the interval of 10 mg/s; selecting the interval to be 20mg/s when the urea demand is within the range of 100-200 mg/s, selecting the interval to be 50mg/s when the urea demand is within the range of 200-500 mg/s, and selecting the interval to be 100mg/s when the urea demand is within the range of 500-1000 mg/s; the preset cooling water temperature value range is as follows: -10 to 120 ℃ and with a spacing of 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 under each preset urea demand and the preset cooling water temperature value can be obtained according to the ratio of the actual urea injection quantity to the urea demand, so that a second compensation coefficient table can be obtained through calculation.
Accordingly, after the cooling water temperature value and the urea demand under the current environment are obtained, the cooling water temperature value and the compensation coefficient under the urea demand under the environment can be obtained from the second compensation coefficient table.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
EXAMPLE III
The embodiment of the application further provides an automobile which can comprise the device for determining the injection quantity of the urea nozzle as provided in the second embodiment of the application or a control module which is used for executing the method for determining the injection quantity of the urea nozzle as provided in the first embodiment of the application.
According to the automobile provided by the application, the urea amount required for purifying nitrogen oxides in the current environment is obtained, and the corresponding compensation coefficient under each preset environment parameter is determined by presetting different environment parameters, wherein the environment parameters are parameters influencing the urea amount sprayed from urea 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; and finally, according to the determined urea injection quantity, controlling a urea nozzle to spray urea to the gas to be purified according to the determined urea injection quantity so as to enable the urea quantity reacted with the nitrogen oxide to be equal to the required urea quantity, thereby achieving the technical effect of completely purifying the gas to be purified, and solving the problem of incomplete tail gas purification caused by consumption of urea due to the influence of environmental parameters in the process from the urea injection to the reaction with the nitrogen oxide.
It should be understood that while the present specification has described preferred embodiments of the present application, additional variations and modifications of those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
The method, the device and the automobile for determining the injection quantity of the urea nozzle provided by the application are described in detail, the principle and the implementation mode of the application are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method of determining an injection quantity of a urea nozzle, the method comprising:
acquiring the current urea demand;
determining a compensation coefficient under a preset environment parameter according to the preset environment parameter;
determining the urea injection quantity 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 injection quantity.
2. The method of claim 1, wherein the predetermined environmental parameters include an exhaust temperature value and/or a cooling water temperature value, and determining a compensation factor for the predetermined environmental parameters based on the predetermined environmental parameters comprises:
and determining a compensation coefficient under the preset environmental parameter according to the exhaust temperature value and/or the cooling water temperature value and the current urea demand.
3. The method of claim 2, wherein determining a compensation factor for the predetermined environmental parameter based on the exhaust temperature value and/or the cooling water temperature value and the current urea demand comprises:
under the condition that the preset environmental parameters comprise the 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 the cooling water temperature value, determining a compensation coefficient under the cooling water temperature value according to the exhaust cooling water temperature value and the current urea demand;
and under the condition that the preset environmental parameters comprise the exhaust temperature value and the cooling water temperature value, determining the compensation coefficient according to the compensation coefficient under the cooling water temperature value and the compensation coefficient under the exhaust temperature value.
4. The method of claim 3, wherein determining a compensation factor for the exhaust temperature value based on the exhaust temperature value and the current urea demand comprises:
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 demand quantities, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demand quantities and the preset exhaust temperature values;
from the first compensation coefficient table, a compensation coefficient at the exhaust temperature value and the current urea demand is obtained.
5. The method of claim 3, wherein determining a compensation factor for the cooling water temperature value based on the drain cooling water temperature value and the current urea demand comprises:
acquiring a pre-stored second compensation coefficient table, wherein the second compensation coefficient table comprises a plurality of different preset urea demand quantities, a plurality of different preset cooling water temperature values and compensation coefficients under the preset urea demand quantities 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 an injection quantity of a urea nozzle, the apparatus comprising:
a first obtaining module: for obtaining the current urea demand;
a first determination module: the compensation module is used for determining a compensation coefficient under a preset environment parameter according to the preset environment parameter;
a second determination module: the urea injection quantity is determined according to the compensation coefficient and the urea demand;
a first control module: and controlling the urea nozzle to spray urea to the gas to be purified according to the urea injection quantity.
7. The apparatus of claim 6, wherein the preset environmental parameters include an exhaust temperature value and/or a cooling water temperature value, the first determination module comprising:
a first determination sub-module: and the compensation coefficient under the preset environmental parameter is determined according to the exhaust 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 under the exhaust temperature value is determined 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 under the cooling water temperature value is determined 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: and the compensation coefficient is determined according to the compensation coefficient under the temperature value of the cooling water and the compensation coefficient under the temperature value of the exhaust gas under the condition that the preset environmental parameters comprise the temperature value of the exhaust gas and the temperature value of the cooling water.
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 table, and comprises a plurality of different preset urea demand quantities, a plurality of different preset exhaust temperature values and compensation coefficients under the preset urea demand quantities and the preset exhaust temperature values;
a second acquisition subunit: for obtaining from the first compensation factor table a compensation factor at the exhaust temperature value and the current urea demand.
10. An automobile, characterized in that it is provided with a device for determining the urea nozzle injection quantity according to any one of claims 6-9, or comprises a control module for executing a method for determining the urea nozzle injection quantity according to any one of claims 1-5.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332785A (en) * | 2006-06-12 | 2007-12-27 | Miura Co Ltd | Denitration device for combustor |
| JP2012002064A (en) * | 2010-05-17 | 2012-01-05 | Isuzu Motors Ltd | Scr system |
| CN103644020A (en) * | 2013-12-24 | 2014-03-19 | 北京科领动力科技有限公司 | Urea water solution spraying rate control method of diesel SCR system |
| WO2014103505A1 (en) * | 2012-12-25 | 2014-07-03 | トヨタ自動車株式会社 | Exhaust purification device for internal combustion engine |
| CN104005824A (en) * | 2014-05-27 | 2014-08-27 | 潍柴动力股份有限公司 | Semiconductor control rectifier (SCR) emission control system and method |
| JP2015110920A (en) * | 2013-12-06 | 2015-06-18 | いすゞ自動車株式会社 | Exhaust emission control system |
| CN105604653A (en) * | 2016-03-18 | 2016-05-25 | 安徽华菱汽车有限公司 | Urea jet control method and device and SCR system |
| JP2019035370A (en) * | 2017-08-15 | 2019-03-07 | いすゞ自動車株式会社 | Exhaust emission control device and vehicle comprising the same |
| CN109944666A (en) * | 2019-05-09 | 2019-06-28 | 华东交通大学 | A kind of SCR system reducing agent supply amount adaptive correction method based on model |
| CN111441846A (en) * | 2020-03-28 | 2020-07-24 | 潍坊势为环保有限公司 | Method and device for correcting urea injection amount of SCR (Selective catalytic reduction) system and SCR system |
| CN113464255A (en) * | 2021-08-03 | 2021-10-01 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals, electronic device and computer storage medium |
-
2021
- 2021-04-28 CN CN202110470380.5A patent/CN114704357B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332785A (en) * | 2006-06-12 | 2007-12-27 | Miura Co Ltd | Denitration device for combustor |
| JP2012002064A (en) * | 2010-05-17 | 2012-01-05 | Isuzu Motors Ltd | Scr system |
| WO2014103505A1 (en) * | 2012-12-25 | 2014-07-03 | トヨタ自動車株式会社 | Exhaust purification device for internal combustion engine |
| JP2015110920A (en) * | 2013-12-06 | 2015-06-18 | いすゞ自動車株式会社 | Exhaust emission control system |
| CN103644020A (en) * | 2013-12-24 | 2014-03-19 | 北京科领动力科技有限公司 | Urea water solution spraying rate control method of diesel SCR system |
| CN104005824A (en) * | 2014-05-27 | 2014-08-27 | 潍柴动力股份有限公司 | Semiconductor control rectifier (SCR) emission control system and method |
| CN105604653A (en) * | 2016-03-18 | 2016-05-25 | 安徽华菱汽车有限公司 | Urea jet control method and device and SCR system |
| JP2019035370A (en) * | 2017-08-15 | 2019-03-07 | いすゞ自動車株式会社 | Exhaust emission control device and vehicle comprising the same |
| CN109944666A (en) * | 2019-05-09 | 2019-06-28 | 华东交通大学 | A kind of SCR system reducing agent supply amount adaptive correction method based on model |
| CN111441846A (en) * | 2020-03-28 | 2020-07-24 | 潍坊势为环保有限公司 | Method and device for correcting urea injection amount of SCR (Selective catalytic reduction) system and SCR system |
| CN113464255A (en) * | 2021-08-03 | 2021-10-01 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals, electronic device and computer storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 姜磊;葛蕴珊;李璞;刘志华;: "柴油机尿素SCR喷射特性的试验研究", 内燃机工程, no. 04 * |
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