CN117869044A - Urea nozzle injection precision correction method and related device - Google Patents
Urea nozzle injection precision correction method and related device Download PDFInfo
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- CN117869044A CN117869044A CN202410270750.4A CN202410270750A CN117869044A CN 117869044 A CN117869044 A CN 117869044A CN 202410270750 A CN202410270750 A CN 202410270750A CN 117869044 A CN117869044 A CN 117869044A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 291
- 239000004202 carbamide Substances 0.000 title claims abstract description 291
- 238000002347 injection Methods 0.000 title claims abstract description 211
- 239000007924 injection Substances 0.000 title claims abstract description 211
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000012937 correction Methods 0.000 title claims abstract description 49
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 564
- 238000004590 computer program Methods 0.000 claims description 17
- 238000001228 spectrum Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 abstract description 23
- 230000003197 catalytic effect Effects 0.000 abstract description 7
- 238000002425 crystallisation Methods 0.000 abstract description 7
- 230000008025 crystallization Effects 0.000 abstract description 7
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses a urea nozzle injection precision correction method and a related device, comprising the following steps: under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard; under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of the urea nozzle; determining a target duty cycle corresponding to the urea temperature; and correcting the current duty ratio to be a target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio. According to the process, under the condition that the content of the nitrogen oxide exceeds the standard due to the temperature influence, the current duty ratio can be adjusted based on the urea temperature of the current urea, urea injection is carried out based on the adjusted target duty ratio, the temperature is different, the adopted target duty ratio is different, and the problems that the post-treatment crystallization is serious and the catalytic oxidation efficiency is greatly reduced due to the fact that the influence of the temperature on the injection precision is considered, the problem that the emission exceeds the standard or the urea injection is excessive can be avoided.
Description
Technical Field
The invention relates to the technical field of big data processing, in particular to a urea nozzle injection precision correction method and a related device.
Background
The existing urea injection precision is mainly determined by initial factory processing precision, an electronic control unit calculates the required urea injection quantity according to the nitrogen oxide content in tail gas, then sends a urea nozzle opening duty ratio instruction to a urea nozzle electromagnetic valve, and the electromagnetic valve is opened and closed through actuation, release and the like to finish urea injection.
In the urea injection process, as the physical and chemical characteristics of viscosity, concentration, density and the like are changed along with the influence of altitude, season, longitude and latitude and the like, the urea injection precision is further changed along with the temperature change, but factory data calibration and nozzle hardware detection are carried out within a set temperature range (such as room temperature), the specific urea physical and chemical characteristics of multiple-use working conditions and environments cannot be covered, the urea injection precision greatly influences the actual urea injection quantity, and the post-treatment crystallization is serious due to the fact that the emission exceeds the standard or the urea injection is excessive, and the catalytic oxidation efficiency is greatly reduced.
Disclosure of Invention
In view of the above, the invention provides a urea nozzle injection precision correction method and a related device, which are used for solving the problems that the existing urea injection process is easy to cause emissions exceeding standards or excessive urea injection causes serious post-treatment crystallization and greatly reduces catalytic oxidation efficiency. The specific scheme is as follows:
A urea nozzle injection precision correction method comprises the following steps:
under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard;
under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of a urea nozzle;
determining a target duty cycle corresponding to the urea temperature;
and correcting the current duty ratio to the target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio.
In the above urea nozzle injection accuracy correction method, optionally, determining an influence factor of the exceeding of the nitrogen oxide content under the condition that the exceeding of the nitrogen oxide content is detected includes:
acquiring the current urea temperature of the current urea, and determining the real injection precision corresponding to the current urea temperature based on a preset injection precision type spectrum;
determining a required duty cycle based on the real injection accuracy, and enabling the urea nozzle to perform urea injection based on the required duty cycle;
if the content of the nitrogen oxides is not greater than a preset nitrogen oxide content threshold value within a preset time period, judging that the content of the nitrogen oxides exceeds the standard and is caused by temperature influence;
And if the content of the nitrogen oxides is larger than a preset nitrogen oxide content threshold value within a preset time period, judging that the content of the nitrogen oxides exceeds the standard and is caused by system faults.
In the above urea nozzle injection accuracy correction method, optionally, determining an influence factor of the exceeding of the nitrogen oxide content under the condition that the exceeding of the nitrogen oxide content is detected includes:
acquiring the current urea temperature of the current urea, determining the actual nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature, and determining the theoretical nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature;
taking the difference between the actual nitrogen oxide concentration difference and the theoretical nitrogen oxide concentration difference as a target concentration deviation, and comparing the target concentration deviation with a preset concentration deviation threshold;
if the target concentration deviation is not larger than the preset concentration deviation threshold, judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence;
and if the target concentration deviation is larger than the preset concentration deviation threshold, judging that the nitrogen oxide content exceeds the standard and is caused by system faults.
The urea nozzle injection precision correction method described above, optionally, determines an actual nitrogen oxide difference value and a theoretical nitrogen oxide difference value between the current urea temperature and the calibrated urea temperature, respectively, including:
Acquiring a first actual nitrogen oxide concentration of the current urea temperature and a second actual nitrogen oxide concentration of the calibrated urea temperature, and taking a difference value between the first actual nitrogen oxide concentration and the second actual nitrogen oxide concentration as the actual nitrogen oxide concentration difference value;
and acquiring a first theoretical nitrogen oxide concentration of the current urea temperature and a second theoretical nitrogen oxide concentration of the calibrated urea temperature, and taking a difference value between the first theoretical nitrogen oxide concentration and the second theoretical nitrogen oxide concentration as a theoretical nitrogen oxide concentration difference value.
The urea nozzle injection accuracy correction method described above, optionally, determines a target duty cycle corresponding to the urea temperature, including:
traversing a preset injection precision type spectrum, and searching a first temperature and a second temperature based on the urea temperature, wherein the urea temperature is contained in a section where the first temperature and the second temperature belong;
acquiring a first injection precision corresponding to the first temperature and a second injection precision corresponding to the second temperature, and interpolating based on the first temperature, the first injection precision, the second temperature and the second injection precision to obtain a current injection precision corresponding to the urea temperature;
Acquiring a calibrated injection quantity and a calibrated duty cycle of a calibrated temperature, and determining a current injection quantity based on the calibrated injection quantity and the current injection precision;
and determining a target duty cycle based on the current injection amount, the calibrated injection amount and the calibrated duty cycle.
A urea nozzle injection accuracy correction device comprising:
the first determining module is used for determining influence factors of the exceeding of the nitrogen oxide content under the condition that the exceeding of the nitrogen oxide content is detected;
the acquisition module is used for acquiring the current urea temperature of the urea and the current duty ratio of the urea nozzle under the condition that the influence factor is the temperature;
a second determining module for determining a target duty cycle corresponding to the urea temperature;
and the correction module is used for correcting the current duty ratio to the target duty ratio, so that the urea nozzle performs urea injection based on the target duty ratio.
In the urea nozzle injection precision correction device, optionally, the first determining module includes:
the first acquisition and determination unit is used for acquiring the current urea temperature of the current urea and determining the real injection precision corresponding to the current urea temperature based on a preset injection precision type spectrum;
A first determining unit, configured to determine a required duty cycle based on the actual injection precision, and cause the urea nozzle to perform urea injection based on the required duty cycle;
the first judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence if the nitrogen oxide content is not larger than a preset nitrogen oxide content threshold value within a preset time period;
and the second judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by system faults if the nitrogen oxide content is larger than a preset nitrogen oxide content threshold value within a preset time.
In the urea nozzle injection precision correction device, optionally, the first determining module includes:
the second acquisition and determination unit is used for acquiring the current urea temperature of the current urea, determining the actual nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature, and determining the theoretical nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature;
a comparison unit, configured to compare the target concentration deviation with a preset concentration deviation threshold value by using a difference between the actual nox concentration difference and the theoretical nox concentration difference as the target concentration deviation;
The third judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence if the target concentration deviation is not larger than the preset concentration deviation threshold value;
and the fourth judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by system faults if the target concentration deviation is larger than the preset concentration deviation threshold value.
In the urea nozzle injection precision correction device, optionally, the second obtaining and determining unit includes:
the actual obtaining and determining subunit is used for obtaining a first actual nitrogen oxide concentration of the current urea temperature and a second actual nitrogen oxide concentration at the calibrated urea temperature, and taking a difference value between the first actual nitrogen oxide concentration and the second actual nitrogen oxide concentration as an actual nitrogen oxide concentration difference value;
a theoretical obtaining and determining subunit, configured to obtain a first theoretical nitrogen oxide concentration of the current urea temperature and a second theoretical nitrogen oxide concentration of the calibrated urea temperature, and take a difference value between the first theoretical nitrogen oxide concentration and the second theoretical nitrogen oxide concentration as the theoretical nitrogen oxide concentration difference value.
In the urea nozzle injection precision correction device, optionally, the second determining module includes:
The searching unit is used for traversing a preset injection precision type spectrum, and searching a first temperature and a second temperature based on the urea temperature, wherein the urea temperature is contained in a section where the first temperature and the second temperature belong;
a third acquisition and determination unit, configured to acquire a first injection precision corresponding to the first temperature and a second injection precision corresponding to the second temperature, and interpolate based on the first temperature, the first injection precision, the second temperature, and the second injection precision, to obtain a current injection precision corresponding to the urea temperature;
a fourth acquisition and determination unit configured to acquire a calibrated injection amount and a calibrated duty ratio of a calibrated temperature, and determine a current injection amount based on the calibrated injection amount and the current injection precision;
and a second determining unit configured to determine a target duty ratio based on the current injection amount, the calibrated injection amount, and the calibrated duty ratio.
A storage medium comprising a stored program, wherein the program performs the steps of the urea nozzle injection accuracy correction method described above.
A computer program product comprising a computer program for executing the steps of the urea nozzle injection accuracy correction method described above by a processor.
Compared with the prior art, the invention has the following advantages:
the invention discloses a urea nozzle injection precision correction method and a related device, comprising the following steps: under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard; under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of a urea nozzle; determining a target duty cycle corresponding to the urea temperature; and correcting the current duty ratio to the target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio. According to the process, under the condition that the content of the nitrogen oxide exceeds the standard due to the temperature influence, the current duty ratio can be adjusted based on the urea temperature of the current urea, urea injection is carried out based on the adjusted target duty ratio, the temperature is different, the adopted target duty ratio is different, and the problems that the post-treatment crystallization is serious and the catalytic oxidation efficiency is greatly reduced due to the fact that the influence of the temperature on the injection precision is considered, the problem that the emission exceeds the standard or the urea injection is excessive can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, 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 a urea nozzle injection accuracy correction method disclosed in an embodiment of the invention;
FIG. 2 is a block diagram of a urea nozzle injection accuracy correction device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses a urea nozzle injection precision correction method and a related device, which are applied to the adjustment process of urea nozzle injection precision, wherein in the prior art, the existing urea injection precision is mainly determined by initial factory processing precision, an electronic control unit sends a urea nozzle opening duty ratio instruction to a urea nozzle electromagnetic valve after calculating the required urea injection quantity according to the nitrogen oxide content in tail gas, the electromagnetic valve is opened and closed through suction release and the like to finish urea injection, in the urea injection process, the urea injection precision greatly influences the actual urea injection quantity, but factory data calibration and nozzle hardware detection are carried out in a set temperature range (such as room temperature), the specific urea physical and chemical characteristics of multiple-use working conditions and environments cannot be covered, and deviation of the calculated urea injection quantity and the actual injection quantity is easy to cause. In order to solve the problems, the invention provides a urea nozzle injection precision correction method, wherein the injection precision represents the ratio of the deviation value of the actual urea injection quantity to the theoretical urea injection quantity, and represents the accuracy and the reliability of the actual urea injection. The execution flow of the method is shown in fig. 1, and comprises the following steps:
S101, under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the nitrogen oxides exceeding the standard;
in the embodiment of the invention, the nitrogen oxide is a common atmospheric pollutant, mainly NO, NO 2 And the like, urea can react with nitrogen oxides as a product in the combustion process of the internal combustion engine, so that the nitrogen oxides are prevented from being discharged toIf the urea nozzle injection accuracy is set unreasonably, but the nitrogen oxide reaction is incomplete, so that the nitrogen oxide content exceeds the standard, therefore, the concentration of the nitrogen oxide needs to be obtained.
Further, under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard, wherein the influence factors in the embodiment of the invention comprise: temperature and system faults, wherein the process of determining the influence factors of the exceeding of the nitrogen oxide content is as follows:
acquiring the current urea temperature of the current urea, wherein the current urea temperature can be acquired based on a temperature sensor, and after the current urea temperature is acquired, determining the actual injection precision corresponding to the current urea temperature based on a preset injection precision type spectrum, wherein the preset injection precision type spectrum is obtained by pre-calibrating, and the preset injection precision type spectrum comprises: temperature and precision deviation corresponding to the temperature, wherein the temperature comprises: the calibration temperature and the reference temperature can be examined based on experience or specific conditions, the embodiment of the invention is not particularly limited, preferably, 25 ℃ is selected as an example for illustration in the embodiment of the invention for the calibration temperature, the corresponding precision deviation is a reference value 0, the reference temperature is 1.2% when the reference temperature is-5 ℃, the injection precision deviation is 0.7% when the reference temperature is 5 ℃, the injection precision deviation is-1.4% when the reference temperature is 35 ℃, the injection precision deviation is-2.8% when the environmental temperature is 65 ℃, the actual injection precision deviation of 25 ℃ compared with the calibration temperature is obtained through interpolation according to different environmental temperatures, and the specific values are calibrated according to the actual measurement.
Further, a required duty cycle is determined based on the real injection precision, and the urea nozzle is made to perform urea injection based on the required duty cycle, wherein the specific determination process of the required duty cycle is as follows:
obtaining a calibrated injection amount and a calibrated duty cycle of the calibrated temperature, wherein in the embodiment of the invention, the calibrated injection amount is assumed to be x mg/s, if the current urea temperature is higher than the calibrated temperature by 25 ℃, the injection precision is smaller; if the current urea temperature is lower than the calibration temperature of 25 ℃, the injection precision is larger. Examples: if the calibrated required injection amount is x mg/s, when the urea temperature is greater than 25 ℃, in order to compensate the urea temperature influence, multiple injections delta% (injection precision) are needed, namely, the actual required injection amount is x (1+delta%), wherein delta% is obtained by calibrating in advance, and the required duty cycle is determined based on the actual required injection amount, the calibrated injection amount and the calibrated duty cycle, namely, the ratio of the actual required injection amount to the required duty cycle is the same as the ratio of the calibrated injection amount to the calibrated duty cycle. The urea nozzle is caused to perform urea injection based on the demand duty cycle. If the nitrogen oxide content is not greater than a preset nitrogen oxide content threshold value within a preset time period, judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence, and if the nitrogen oxide content is greater than the preset nitrogen oxide content threshold value within the preset time period, indicating that the correction method cannot act on nitrogen oxide concentration reduction, judging that the nitrogen oxide content exceeds the standard and is caused by system faults, reporting the faults, and prompting the on-site detection and maintenance, wherein the preset nitrogen oxide content threshold value can be set based on experience or specific conditions, and the embodiment of the invention is not particularly limited.
Further, the determination of the influence factor of the exceeding of the nitrogen oxide content can also be achieved by the following manner, and the specific determination process is as follows:
acquiring the current urea temperature of the current urea,
acquiring the current urea temperature of the current urea, determining an actual nitrogen oxide concentration difference value between the current urea temperature and a calibrated urea temperature, and determining a theoretical nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature, wherein the determination process of the actual nitrogen oxide concentration difference value and the theoretical nitrogen oxide concentration difference value is as follows:
acquiring a first actual nitrogen oxide concentration of the current urea temperature and a second actual nitrogen oxide concentration at the calibrated urea temperature, and taking a difference value between the first actual nitrogen oxide concentration and the second actual nitrogen oxide concentration as the actual nitrogen oxide concentration difference value, wherein the first actual nitrogen oxide concentration and the second actual nitrogen oxide concentration are obtained based on a nitrogen oxide concentration sensor.
And acquiring a first theoretical nitrogen oxide concentration of the current urea temperature and a second theoretical nitrogen oxide concentration of the calibrated urea temperature, and taking a difference value between the first theoretical nitrogen oxide concentration and the second theoretical nitrogen oxide concentration as a theoretical nitrogen oxide concentration difference value. Wherein the first theoretical nitrogen oxide concentration and the second theoretical nitrogen oxide concentration are obtained in advance by a calibration method.
And taking the difference between the actual nitrogen oxide concentration difference and the theoretical nitrogen oxide concentration difference as a target concentration deviation, and comparing the target concentration deviation with a preset concentration deviation threshold, wherein the preset concentration deviation threshold can be set based on experience or specific conditions, and the embodiment of the invention is not particularly limited. And if the target concentration deviation is not larger than the preset concentration deviation threshold, judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence. If the target concentration deviation is larger than the preset concentration deviation threshold value, the correction method is not capable of acting on the reduction of the concentration of the nitrogen oxides, the condition that the nitrogen oxide content exceeds the standard and is caused by system faults is judged, the faults are reported, the incoming station is prompted to detect and maintain,
s102, under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of a urea nozzle;
in the embodiment of the present invention, under the condition that the influencing factor is determined as the temperature, the current urea temperature of the urea and the current duty ratio of the urea nozzle are obtained, and because the urea temperature in the urea tank is basically constant in a certain time, if the temperature is unchanged, the urea temperature is the same as the current urea temperature in S101, the current duty ratio is the same as the required duty ratio in S101, and if the temperature is changed, the urea temperature and the current duty ratio are obtained again, wherein the second-speed temperature is obtained through a temperature sensor, the current duty ratio is predetermined, the determination mode is the same as the determination process of the required duty ratio in S101, and is not repeated herein, the current duty ratio is directly stored in a preset position, and can be obtained in detail in the preset position, and the preset position can be set based on experience or specific conditions.
S103, determining a target duty cycle corresponding to the urea temperature;
in the embodiment of the present invention, the process of determining the target duty ratio corresponding to the urea temperature is the same as the process of determining the required duty ratio, and the specific determining process is as follows:
traversing a preset injection precision type spectrum, and searching a first temperature and a second temperature based on the urea temperature, wherein the urea temperature is contained in a section where the first temperature and the second temperature belong;
acquiring a first injection precision corresponding to the first temperature and a second injection precision corresponding to the second temperature, and interpolating based on the first temperature, the first injection precision, the second temperature and the second injection precision to obtain a current injection precision corresponding to the urea temperature; and (3) obtaining a calibrated injection quantity and a calibrated duty ratio of the calibrated temperature, and determining a current injection quantity based on the calibrated injection quantity and the current injection precision, wherein the determination process of the current injection quantity is the same as the determination process of the actual required injection quantity in the step S101, and the detailed description is omitted.
Determining a target duty ratio based on the current injection amount, the calibrated injection amount and the calibrated duty ratio, wherein the determining process is as follows: and the ratio of the current injection quantity to the target duty cycle is the same as the ratio of the calibrated injection quantity to the calibrated duty cycle, and finally the target duty cycle is obtained.
And S104, correcting the current duty ratio to the target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio.
In the embodiment of the invention, the current duty ratio is obtained, the current duty ratio is replaced by the target duty ratio, the correction of the current duty ratio is realized, and after the correction is finished, the urea nozzle is enabled to perform urea injection based on the target duty ratio.
The invention discloses a urea nozzle injection precision correction method, which comprises the following steps: under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard; under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of a urea nozzle; determining a target duty cycle corresponding to the urea temperature; and correcting the current duty ratio to the target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio. According to the process, under the condition that the content of the nitrogen oxide exceeds the standard due to the temperature influence, the current duty ratio can be adjusted based on the urea temperature of the current urea, urea injection is carried out based on the adjusted target duty ratio, the temperature is different, the adopted target duty ratio is different, and the problems that the post-treatment crystallization is serious and the catalytic oxidation efficiency is greatly reduced due to the fact that the influence of the temperature on the injection precision is considered, the problem that the emission exceeds the standard or the urea injection is excessive can be avoided.
In the embodiment of the invention, the temperature influence is eliminated by detecting and correcting the urea temperature and the urea nozzle injection precision in real time on line, the system maintenance diagnosis efficiency is improved, and the excessive maintenance of the system is avoided; in addition, the urea nozzle injection precision is corrected in stages, so that the normal operation of the nozzle can be ensured to the greatest extent, the robustness of the system is improved, the misjudgment is avoided, the risk of exceeding the standard or crystallizing of the system emission is reduced, and the use area and the use scene of the engine are widened.
Based on the above-mentioned method for correcting the injection precision of the urea nozzle, the embodiment of the invention also provides a device for correcting the injection precision of the urea nozzle, and the structural block diagram of the device is shown in fig. 2 and comprises:
a first determination module 201, an acquisition module 202, a second determination module 203, and a correction module 204.
Wherein,
the first determining module 201 is configured to determine an influencing factor of the nitrogen oxide content exceeding the standard if the nitrogen oxide content exceeding the standard is detected;
the obtaining module 202 is configured to obtain a current urea temperature of urea and a current duty cycle of a urea nozzle when the influencing factor is a temperature;
the second determining module 203 is configured to determine a target duty cycle corresponding to the urea temperature;
The correction module 204 is configured to correct the current duty cycle to the target duty cycle, and cause the urea nozzle to perform urea injection based on the target duty cycle.
The invention discloses a urea nozzle injection precision correction device, which comprises: under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard; under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of a urea nozzle; determining a target duty cycle corresponding to the urea temperature; and correcting the current duty ratio to the target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio. According to the process, under the condition that the content of the nitrogen oxide exceeds the standard due to the temperature influence, the current duty ratio can be adjusted based on the urea temperature of the current urea, urea injection is carried out based on the adjusted target duty ratio, the temperature is different, the adopted target duty ratio is different, and the problems that the post-treatment crystallization is serious and the catalytic oxidation efficiency is greatly reduced due to the fact that the influence of the temperature on the injection precision is considered, the problem that the emission exceeds the standard or the urea injection is excessive can be avoided.
In the embodiment of the present invention, the first determining module 201 includes:
the first acquisition and determination unit, the first determination unit, and the second determination unit.
Wherein,
the first acquisition and determination unit is used for acquiring the current urea temperature of the current urea and determining the real injection precision corresponding to the current urea temperature based on a preset injection precision type spectrum;
the first determining unit is used for determining a required duty cycle based on the real injection precision, and enabling the urea nozzle to perform urea injection based on the required duty cycle;
the first judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence if the nitrogen oxide content is not larger than a preset nitrogen oxide content threshold value within a preset time.
And the second judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by system faults if the nitrogen oxide content is larger than a preset nitrogen oxide content threshold value within a preset time.
In the embodiment of the present invention, the first determining module 201 includes:
the second acquisition and determination unit, the comparison unit, the third determination unit, and the fourth determination unit.
Wherein,
the second acquiring and determining unit is used for acquiring the current urea temperature of the current urea and respectively determining an actual nitrogen oxide concentration difference value and a theoretical nitrogen oxide concentration difference value of the current urea temperature and a calibrated urea temperature;
The comparison unit is used for taking the difference between the actual nitrogen oxide concentration difference value and the theoretical nitrogen oxide concentration difference value as a target concentration deviation and comparing the target concentration deviation with a preset concentration deviation threshold value;
and the third judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence if the target concentration deviation is not larger than the preset concentration deviation threshold value.
And the fourth judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by system faults if the target concentration deviation is larger than the preset concentration deviation threshold value.
In an embodiment of the present invention, the second acquiring and determining unit includes:
an actual acquisition and determination subunit and a theoretical acquisition and determination subunit.
Wherein,
the actual obtaining and determining subunit is configured to use a first actual nitrogen oxide concentration of the current urea temperature and a second actual nitrogen oxide concentration of the calibrated urea temperature, and take a difference between the first actual nitrogen oxide concentration and the second actual nitrogen oxide concentration as the actual nitrogen oxide concentration difference;
the theoretical obtaining and determining subunit is configured to obtain a first theoretical nitrogen oxide concentration of the current urea temperature and a second theoretical nitrogen oxide concentration of the calibrated urea temperature, and take a difference value between the first theoretical nitrogen oxide concentration and the second theoretical nitrogen oxide concentration as the theoretical nitrogen oxide concentration difference value.
In the embodiment of the present invention, the second determining module 203 includes:
the device comprises a searching unit, a third acquiring and determining unit, a fourth acquiring and determining unit and a second determining unit.
Wherein,
the searching unit is used for traversing a preset injection precision type spectrum, and searching a first temperature and a second temperature based on the urea temperature, wherein the urea temperature is contained in a section where the first temperature and the second temperature belong;
a third acquisition and determination unit, configured to acquire a first injection precision corresponding to the first temperature and a second injection precision corresponding to the second temperature, and interpolate based on the first temperature, the first injection precision, the second temperature, and the second injection precision, to obtain a current injection precision corresponding to the urea temperature;
a fourth acquisition and determination unit configured to acquire a calibrated injection amount and a calibrated duty ratio of a calibrated temperature, and determine a current injection amount based on the calibrated injection amount and the current injection precision;
and a second determining unit configured to determine a target duty ratio based on the current injection amount, the calibrated injection amount, and the calibrated duty ratio.
The correction device comprises a processor and a memory, wherein the first determination module, the acquisition module, the second determination module, the correction module and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problems of serious post-treatment crystallization and greatly reduced catalytic oxidation efficiency caused by excessive emission or urea injection are solved by adjusting the parameters of the inner core.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the invention provides a computer storage medium, wherein a program is stored on the computer storage medium, and the program is executed by a processor to realize the steps of the urea nozzle injection precision correction method.
The embodiment of the invention provides a processor which is used for running a program, wherein the program runs to execute the steps of the urea nozzle injection precision correction method.
The embodiment of the invention provides a computer program product, which comprises a computer program, wherein the computer program realizes the steps of the urea nozzle injection precision correction method provided by the embodiment of the application when being executed by a processor.
An embodiment of the present invention provides an apparatus, where a structural block diagram of the apparatus is shown in fig. 3, and the apparatus includes: a processor 301, a storage medium 302, and a program stored on the storage medium 302 and executable on the processor 301, the processor 301 executing the program implementing the steps of:
under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard;
under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of a urea nozzle;
determining a target duty cycle corresponding to the urea temperature;
and correcting the current duty ratio to the target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (12)
1. The urea nozzle injection precision correction method is characterized by comprising the following steps of:
under the condition that the content of the nitrogen oxides exceeds the standard, determining influence factors of the content of the nitrogen oxides exceeding the standard;
under the condition that the influencing factor is temperature, acquiring the current urea temperature of the urea and the current duty ratio of a urea nozzle;
determining a target duty cycle corresponding to the urea temperature;
and correcting the current duty ratio to the target duty ratio, and enabling the urea nozzle to perform urea injection based on the target duty ratio.
2. The urea nozzle injection accuracy correction method according to claim 1, wherein, in the case where the exceeding of the nitrogen oxide content is detected, determining the influence factor of the exceeding of the nitrogen oxide content includes:
acquiring the current urea temperature of the current urea, and determining the real injection precision corresponding to the current urea temperature based on a preset injection precision type spectrum;
determining a required duty cycle based on the real injection accuracy, and enabling the urea nozzle to perform urea injection based on the required duty cycle;
if the content of the nitrogen oxides is not greater than a preset nitrogen oxide content threshold value within a preset time period, judging that the content of the nitrogen oxides exceeds the standard and is caused by temperature influence;
And if the content of the nitrogen oxides is larger than a preset nitrogen oxide content threshold value within a preset time period, judging that the content of the nitrogen oxides exceeds the standard and is caused by system faults.
3. The urea nozzle injection accuracy correction method according to claim 1, wherein, in the case where the exceeding of the nitrogen oxide content is detected, determining the influence factor of the exceeding of the nitrogen oxide content includes:
acquiring the current urea temperature of the current urea, determining the actual nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature, and determining the theoretical nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature;
taking the difference between the actual nitrogen oxide concentration difference and the theoretical nitrogen oxide concentration difference as a target concentration deviation, and comparing the target concentration deviation with a preset concentration deviation threshold;
if the target concentration deviation is not larger than the preset concentration deviation threshold, judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence;
and if the target concentration deviation is larger than the preset concentration deviation threshold, judging that the nitrogen oxide content exceeds the standard and is caused by system faults.
4. A urea nozzle injection accuracy correction method according to claim 3, characterized in that determining the actual difference in nitrogen oxide concentration at the current urea temperature and at the calibrated urea temperature, determining the theoretical difference in nitrogen oxide concentration at the current urea temperature and at the calibrated urea temperature, comprises:
Acquiring a first actual nitrogen oxide concentration of the current urea temperature and a second actual nitrogen oxide concentration of the calibrated urea temperature, and taking a difference value between the first actual nitrogen oxide concentration and the second actual nitrogen oxide concentration as the actual nitrogen oxide concentration difference value;
and acquiring a first theoretical nitrogen oxide concentration of the current urea temperature and a second theoretical nitrogen oxide concentration of the calibrated urea temperature, and taking a difference value between the first theoretical nitrogen oxide concentration and the second theoretical nitrogen oxide concentration as a theoretical nitrogen oxide concentration difference value.
5. The urea nozzle injection accuracy correction method according to claim 1, characterized in that determining a target duty ratio corresponding to the urea temperature includes:
traversing a preset injection precision type spectrum, and searching a first temperature and a second temperature based on the urea temperature, wherein the urea temperature is contained in a section where the first temperature and the second temperature belong;
acquiring a first injection precision corresponding to the first temperature and a second injection precision corresponding to the second temperature, and interpolating based on the first temperature, the first injection precision, the second temperature and the second injection precision to obtain a current injection precision corresponding to the urea temperature;
Acquiring a calibrated injection quantity and a calibrated duty cycle of a calibrated temperature, and determining a current injection quantity based on the calibrated injection quantity and the current injection precision;
and determining a target duty cycle based on the current injection amount, the calibrated injection amount and the calibrated duty cycle.
6. A urea nozzle injection accuracy correction device, comprising:
the first determining module is used for determining influence factors of the exceeding of the nitrogen oxide content under the condition that the exceeding of the nitrogen oxide content is detected;
the acquisition module is used for acquiring the current urea temperature of the urea and the current duty ratio of the urea nozzle under the condition that the influence factor is the temperature;
a second determining module for determining a target duty cycle corresponding to the urea temperature;
and the correction module is used for correcting the current duty ratio to the target duty ratio, so that the urea nozzle performs urea injection based on the target duty ratio.
7. The urea nozzle injection precision correction device according to claim 6, characterized in that the first determination module comprises:
the first acquisition and determination unit is used for acquiring the current urea temperature of the current urea and determining the real injection precision corresponding to the current urea temperature based on a preset injection precision type spectrum;
A first determining unit, configured to determine a required duty cycle based on the actual injection precision, and cause the urea nozzle to perform urea injection based on the required duty cycle;
the first judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence if the nitrogen oxide content is not larger than a preset nitrogen oxide content threshold value within a preset time period;
and the second judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by system faults if the nitrogen oxide content is larger than a preset nitrogen oxide content threshold value within a preset time.
8. The urea nozzle injection precision correction device according to claim 6, characterized in that the first determination module comprises:
the second acquisition and determination unit is used for acquiring the current urea temperature of the current urea, determining the actual nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature, and determining the theoretical nitrogen oxide concentration difference value between the current urea temperature and the calibrated urea temperature;
a comparison unit, configured to compare the target concentration deviation with a preset concentration deviation threshold value by using a difference between the actual nox concentration difference and the theoretical nox concentration difference as the target concentration deviation;
The third judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by temperature influence if the target concentration deviation is not larger than the preset concentration deviation threshold value;
and the fourth judging unit is used for judging that the nitrogen oxide content exceeds the standard and is caused by system faults if the target concentration deviation is larger than the preset concentration deviation threshold value.
9. The urea nozzle injection precision correction device according to claim 8, characterized in that the second acquisition and determination unit comprises:
the actual obtaining and determining subunit is used for obtaining a first actual nitrogen oxide concentration of the current urea temperature and a second actual nitrogen oxide concentration at the calibrated urea temperature, and taking a difference value between the first actual nitrogen oxide concentration and the second actual nitrogen oxide concentration as an actual nitrogen oxide concentration difference value;
a theoretical obtaining and determining subunit, configured to obtain a first theoretical nitrogen oxide concentration of the current urea temperature and a second theoretical nitrogen oxide concentration of the calibrated urea temperature, and take a difference value between the first theoretical nitrogen oxide concentration and the second theoretical nitrogen oxide concentration as the theoretical nitrogen oxide concentration difference value.
10. The urea nozzle injection precision correction device according to claim 6, characterized in that the second determination module comprises:
the searching unit is used for traversing a preset injection precision type spectrum, and searching a first temperature and a second temperature based on the urea temperature, wherein the urea temperature is contained in a section where the first temperature and the second temperature belong;
a third acquisition and determination unit, configured to acquire a first injection precision corresponding to the first temperature and a second injection precision corresponding to the second temperature, and interpolate based on the first temperature, the first injection precision, the second temperature, and the second injection precision, to obtain a current injection precision corresponding to the urea temperature;
a fourth acquisition and determination unit configured to acquire a calibrated injection amount and a calibrated duty ratio of a calibrated temperature, and determine a current injection amount based on the calibrated injection amount and the current injection precision;
and a second determining unit configured to determine a target duty ratio based on the current injection amount, the calibrated injection amount, and the calibrated duty ratio.
11. A storage medium comprising a stored program, wherein the program performs the steps of the urea nozzle injection accuracy correction method according to any one of claims 1-5.
12. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, realizes the steps of the urea nozzle injection accuracy correction method according to any one of claims 1-5.
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