CN117888983A - Urea injection control method and device, vehicle and storage medium - Google Patents
Urea injection control method and device, vehicle and storage medium Download PDFInfo
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- CN117888983A CN117888983A CN202410289003.5A CN202410289003A CN117888983A CN 117888983 A CN117888983 A CN 117888983A CN 202410289003 A CN202410289003 A CN 202410289003A CN 117888983 A CN117888983 A CN 117888983A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 239000004202 carbamide Substances 0.000 title claims abstract description 75
- 238000002347 injection Methods 0.000 title claims abstract description 71
- 239000007924 injection Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 52
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 376
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 171
- 238000006243 chemical reaction Methods 0.000 claims abstract description 56
- 238000011897 real-time detection Methods 0.000 claims abstract description 9
- 230000003647 oxidation Effects 0.000 claims description 18
- 238000007254 oxidation reaction Methods 0.000 claims description 18
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 17
- 238000004590 computer program Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 321
- 238000010586 diagram Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 238000010531 catalytic reduction reaction Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a urea injection control method, a urea injection control device, a vehicle and a storage medium. The urea injection control method comprises the following steps: when the set engine running condition is met, acquiring a target pre-SCR pre-temperature value, and judging whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value; if the front SCR temperature step is judged to occur, acquiring the downstream ammonia slip quantity of the front SCR, and respectively determining a first ammonia slip conversion NOx value and a second ammonia slip conversion NOx value based on the downstream ammonia slip quantity of the front SCR; and acquiring a measured value of the NOx sensor, which is obtained through real-time detection of the NOx sensor, and determining a target NOx value according to the measured value of the NOx sensor, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value, so as to control the post SCR to perform ammonia storage closed-loop control based on the target NOx value. The invention realizes more accurate judgment of ammonia leakage.
Description
Technical Field
The present invention relates to the field of post-treatment control technologies, and in particular, to a urea injection control method, a urea injection control device, a vehicle, and a storage medium.
Background
With the continuous development of automobile electronic technology, diesel emission control has been paid attention to by the national environmental protection department. The Selective Catalytic Reduction (SCR) technology is a treatment technology for NOx in diesel vehicle exhaust emission, is widely applied to diesel engine exhaust aftertreatment, and uses urea for vehicle to carry out selective catalytic reduction on nitrogen oxides (NOx), so as to achieve the purposes of energy conservation and emission reduction.
The control objective of the SCR system is to inject proper urea into the exhaust pipe according to different engine operation conditions, so that the NOx conversion efficiency is improved as much as possible under the condition that NH3 leakage at the downstream of the catalyst is not more than a certain limit, and the engine is ensured to meet the tail emission requirement. It is considered that ammonia slip occurs in a sudden increase in temperature due to a large ammonia storage amount and a small ammonia storage amount Wen Shian at a low temperature in SCR ammonia storage, and if ammonia slip occurs, it is unavoidable that the control of the SCR urea injection amount will be affected. Furthermore, the SCR urea control strategy influences the catalytic conversion performance of NOx in the catalyst by accurately metering and accurately injecting the reducing agent urea solution, and if too much urea is injected, too much ammonia can volatilize into the environment, so that secondary pollution is caused to the environment; if the urea injection amount is too small, the catalytic conversion efficiency of NOx in the catalyst is too low, so that the emission amount of nitrogen oxides in the waste gas can not be effectively reduced, and the emission regulation requirement can not be met. Therefore, the accuracy of control of the urea injection quantity is critical.
Disclosure of Invention
The invention provides a urea injection control method, a device, a vehicle and a storage medium, which are used for solving the problem that ammonia leakage caused by SCR temperature sudden increase in an aftertreatment system can influence urea injection quantity.
According to an aspect of the present invention, there is provided a urea injection control method including:
when the set engine running condition is met, acquiring a target pre-SCR pre-temperature value, and judging whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value;
if the occurrence of the pre-SCR temperature step is judged, acquiring the downstream ammonia slip quantity of the pre-SCR, and respectively determining a first ammonia slip conversion NOx value and a second ammonia slip conversion NOx value based on the downstream ammonia slip quantity of the pre-SCR;
and acquiring a NOx sensor measured value obtained through real-time detection of a NOx sensor, and determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value so as to control the post SCR to perform ammonia storage closed-loop control based on the target NOx value.
Optionally, the acquiring the target pre-SCR temperature value includes:
and acquiring an initial pre-SCR pre-temperature value in a set acquisition time length, and determining a corresponding target pre-SCR pre-temperature value in the set acquisition time length according to the initial pre-SCR pre-temperature value.
Optionally, the determining whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value includes:
and determining a pre-SCR pre-temperature difference value according to the corresponding target pre-SCR pre-temperature value in the set acquisition time length of two adjacent sections, and judging whether a pre-SCR temperature step occurs according to the pre-SCR pre-temperature difference value.
Optionally, the judging whether the pre-SCR temperature step occurs according to the pre-SCR pre-temperature difference value includes:
if the front SCR front temperature difference exceeds the first front SCR front temperature limit value, judging that front SCR temperature step occurs;
if the front SCR front temperature difference value does not exceed the second front SCR front temperature limit value, judging that the front SCR temperature step does not occur;
wherein the first pre-SCR temperature limit is greater than the second pre-SCR pre-temperature limit.
Optionally, the acquiring the ammonia slip downstream of the pre-SCR includes:
and acquiring the ammonia leakage amount of the downstream model of the pre-SCR and the oxidation rate of the DOC to NH3, and determining the downstream ammonia leakage amount of the pre-SCR according to the ammonia leakage amount of the downstream model of the pre-SCR and the oxidation rate of the DOC to NH 3.
Optionally, the determining the first ammonia slip converted NOx value and the second ammonia slip converted NOx value based on the pre-SCR downstream ammonia slip amount, respectively, includes:
and determining a first ammonia slip conversion NOx value according to the ammonia slip amount of the downstream of the pre-SCR, and determining a second ammonia slip conversion NOx value according to the ammonia slip amount of the downstream model of the pre-SCR.
Optionally, the determining a target NOx value from the NOx sensor measurement, the first ammonia slip converted NOx value, and the second ammonia slip converted NOx value includes:
the target NOx value is determined based on the following formula:
；
wherein,is the target NOx value;-for the NOx sensor measurement;converting a NOx value for the first ammonia slip; is thatThe second ammonia slip converts the NOx value.
According to another aspect of the present invention, there is provided a urea injection control device including:
the temperature step judgment module is used for acquiring a target pre-SCR front temperature value when the set engine running condition is met, and judging whether a pre-SCR temperature step occurs according to the target pre-SCR front temperature value;
the ammonia leakage conversion NOx value determining module is used for acquiring the downstream ammonia leakage amount of the front SCR after judging that the front SCR temperature step occurs, and respectively determining a first ammonia leakage conversion NOx value and a second ammonia leakage conversion NOx value based on the downstream ammonia leakage amount of the front SCR;
the urea injection control module is used for executing acquisition of a NOx sensor measured value obtained through real-time detection of a NOx sensor, determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value, and controlling the post SCR to perform ammonia storage closed-loop control based on the target NOx value.
According to another aspect of the present invention, there is provided a vehicle including:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the urea injection control method according to any one of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute the urea injection control method according to any one of the embodiments of the present invention.
According to the technical scheme, when the set engine running condition is met, a target pre-SCR front temperature value is obtained, and whether a pre-SCR temperature step occurs or not is judged according to the target pre-SCR front temperature value; if the occurrence of the pre-SCR temperature step is judged, acquiring the downstream ammonia slip quantity of the pre-SCR, and respectively determining a first ammonia slip conversion NOx value and a second ammonia slip conversion NOx value based on the downstream ammonia slip quantity of the pre-SCR; and acquiring a NOx sensor measured value obtained through real-time detection of a NOx sensor, and determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value so as to control the post SCR to perform ammonia storage closed-loop control based on the target NOx value. The invention solves the problem that ammonia leakage caused by the sudden increase of the temperature of the SCR in the post-treatment system can influence the urea injection quantity, and realizes more accurate judgment of the ammonia leakage, thereby more accurate urea injection control of the post-SCR.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and 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 injection control method according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a urea injection control method according to a second embodiment of the present invention;
FIG. 3 is a hardware arrangement rack diagram of an applicable dual SCR system provided in accordance with an embodiment of the present invention;
FIG. 4 is a control strategy diagram of a urea injection control method provided in accordance with an embodiment of the present disclosure;
FIG. 5 is a control effect diagram of an exemplary urea injection with or without correction provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a urea injection control device according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a vehicle implementing a urea injection control method according to an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a urea injection control method according to an embodiment of the present invention, where the urea injection control method may be applied to a dual-injection SCR aftertreatment system for urea injection coordination control, and the urea injection control method may be implemented by a urea injection control device, which may be implemented in hardware and/or software, and the urea injection control device may be configured in various vehicles configured in the dual-injection SCR aftertreatment system. As shown in fig. 1, the urea injection control method includes:
s110, when the set engine running condition is met, acquiring a target pre-SCR pre-temperature value, and judging whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value.
The set engine operating condition may include, but is not limited to, at least one of conditions required for engine operation, including a NOx sensor state in the aftertreatment system, an operating state in which the engine is located, an engine speed, an engine torque, and an engine operating mode, and the present embodiment does not impose any limitation on the specific content of the set engine operating condition.
The state of the NOx sensor in the aftertreatment system is that the NOx sensor is effective or that the NOx sensor is not effective, the running state of the engine can be the running state of the engine under the condition that the engine has a direct relation with the action of the engine, the running state of the engine is not particularly limited, the engine rotating speed and the engine torque are in a proper range, the running mode of the engine can be a mode related to the temperature of the aftertreatment system, and the running mode of the engine can be a heating mode of the aftertreatment.
For example, meeting the set engine operating conditions is that the NOx sensor in the aftertreatment system is active, the engine operating state is stable, the engine speed and engine torque are within the appropriate ranges, and the engine operating mode is that the aftertreatment is in the heating mode.
When the running condition of the set engine is met, the initial pre-SCR pre-temperature value in the set collection time length is obtained in real time, namely, a plurality of initial pre-SCR pre-temperature values are collected in real time according to time division in the set collection time length, and the average of the plurality of initial pre-SCR pre-temperature values collected in the set collection time length is carried out to obtain the corresponding target pre-SCR pre-temperature value in the set collection time length.
The initial pre-SCR pre-temperature value is obtained by real-time acquisition through a temperature sensor arranged at the pre-SCR, and the target pre-SCR pre-temperature value is obtained by averaging all initial pre-SCR pre-temperature values acquired within a set acquisition time length.
On the basis of the above, the difference value is obtained by solving the obtained difference value of the target pre-SCR pre-temperature values corresponding to the two adjacent sections within the set acquisition time length, the pre-SCR pre-temperature difference value is obtained, and whether the pre-SCR temperature step occurs is judged according to the pre-SCR pre-temperature difference value.
And S120, if the front-end SCR temperature step is judged to occur, acquiring the downstream ammonia slip quantity of the front-end SCR, and respectively determining a first ammonia slip conversion NOx value and a second ammonia slip conversion NOx value based on the downstream ammonia slip quantity of the front-end SCR.
In this embodiment, by determining that the pre-SCR temperature step occurs, it is considered that ammonia slip occurs in the pre-SCR, that is, ammonia that will leak downstream of the pre-SCR is oxidized by noble metal through the DOC, and the oxidation rate of NH3 by the DOC needs to be considered.
Specifically, the ammonia leakage amount of the downstream model of the pre-SCR and the NH3 oxidation rate of the DOC are obtained, and the downstream ammonia leakage amount of the pre-SCR is determined according to the ammonia leakage amount of the downstream model of the pre-SCR and the NH3 oxidation rate of the DOC.
The ammonia slip amount of the downstream model of the pre-SCR can be calculated by a physical model of the pre-SCR, but is not limited to this, and can be obtained by other existing methods.
The DOC can be used for determining the NH3 oxidation rate by constructing MAP in advance based on the current after-treatment system temperature and airspeed inquiry, or can be used for determining the NH3 oxidation rate by presetting a fixed value and other existing modes, and the embodiment is not limited in any way.
On the basis of the above, a first ammonia slip conversion NOx value is determined based on the ammonia slip downstream of the pre-SCR, and a second ammonia slip conversion NOx value is determined based on the ammonia slip downstream of the pre-SCR.
S130, acquiring a NOx sensor measured value obtained through real-time detection of a NOx sensor, and determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value so as to control a rear SCR (selective catalytic reduction) to perform ammonia storage closed-loop control based on the target NOx value.
Wherein, here the NOx sensor is the sensor that arranges in the leading SCR low reaches, and the NOx sensor is used for detecting the nitrogen oxide concentration in the engine exhaust gas to feed back to ECU (Electronic Control Unit ) nitrogen oxide concentration, NOx sensor measured value is the nitrogen oxide concentration that detects in real time through the NOx sensor.
The cross sensitivity of the NOx sensor may misrecognize the leaked NH3 as NOx, and the actual NOx flowing into the post SCR may be composed of three parts, namely a NOx sensor measurement value, a first ammonia slip converted NOx value and a second ammonia slip converted NOx value, and accordingly, a target NOx value is determined based on the following formula, specifically:
；
wherein,is the target NOx value;-for the NOx sensor measurement;converting a NOx value for the first ammonia slip; is thatThe second ammonia slip converts the NOx value.
Furthermore, the final calculated target NOx value (namely the actual NOx amount) is used as the input of a post-SCR physical model, and the post-SCR ammonia storage closed-loop control is carried out by taking the final calculated target NOx value (namely the actual NOx amount) as a reference, so that the injection amount of the post-SCR is regulated, and the aim of more accurate urea injection control is fulfilled.
According to the technical scheme, when the set engine running condition is met, a target pre-SCR front temperature value is obtained, and whether a pre-SCR temperature step occurs or not is judged according to the target pre-SCR front temperature value; if the occurrence of the pre-SCR temperature step is judged, acquiring the downstream ammonia slip quantity of the pre-SCR, and respectively determining a first ammonia slip conversion NOx value and a second ammonia slip conversion NOx value based on the downstream ammonia slip quantity of the pre-SCR; and acquiring a NOx sensor measured value obtained through real-time detection of a NOx sensor, and determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value so as to control the post SCR to perform ammonia storage closed-loop control based on the target NOx value. The invention solves the problem that ammonia leakage caused by the sudden increase of the temperature of the SCR in the post-treatment system can influence the urea injection quantity, and realizes more accurate judgment of the ammonia leakage, thereby more accurate urea injection control of the post-SCR.
Example two
Fig. 2 is a flowchart of a urea injection control method according to a second embodiment of the present invention, and an alternative implementation manner is provided based on the foregoing embodiment. FIG. 3 is a diagram of a hardware arrangement of an adapted dual SCR system according to an embodiment of the present invention, as shown in FIG. 3, where engine exhaust sequentially passes through a presCR (pre-SCR device, selectively catalytic reduction), a DOC (diesel oxidation catalytic converter, diesel Oxidation Catalyst), a DPF (diesel particulate filter ), and a posSCR (post-SCR device), the presCR being positioned near the turbine, urea being injected before the presCR to reduce nitrogen oxides in the exhaust emissions, the posSCR being positioned far from the turbine, urea being injected before the posSCR to reduce nitrogen oxides in the exhaust emissions, the DOC being positioned before the DPF for converting NO in the exhaust emissions to NO 2 And meanwhile, the temperature of the tail gas is increased, the normal work of the DPF and the double SCR is assisted, the DPF is used for trapping the particulate matters in the tail gas, and when the trapped particulate matters reach a certain degree, passive regeneration or active regeneration is required, so that the trapping capacity of the DPF on the particulate matters is recovered.
By identifying the ammonia leakage condition of the front SCR and timely correcting the NOx entering the rear SCR, and further ensuring the accuracy of the rear SCR control, fig. 4 is a control strategy diagram of a urea injection control method according to an embodiment of the present invention, and as shown in fig. 2 and 4, the urea injection control method includes:
s210, when the set engine running condition is met, acquiring an initial pre-SCR pre-temperature value in a set acquisition time length, and determining a corresponding target pre-SCR pre-temperature value in the set acquisition time length according to the initial pre-SCR pre-temperature value.
It will be appreciated that, as shown in fig. 4, when the set engine operating condition is satisfied, the timer may be used to calculate the acquisition time of the initial pre-SCR temperature value, and after the target pre-SCR pre-temperature value corresponding to the set acquisition time is acquired, the timer is cleared, and the timing is restarted to acquire the initial pre-SCR pre-temperature value.
S220, determining a pre-SCR temperature difference value according to the corresponding target pre-SCR temperature values in the set acquisition time periods of two adjacent sections, and judging whether a pre-SCR temperature step occurs according to the pre-SCR temperature difference value.
The front-end SCR front-end temperature difference value is obtained by solving the difference between the front-end SCR front-end temperature values of the corresponding targets in the set acquisition time length of the two adjacent sections.
In this embodiment, when judging that the temperature of the pre-SCR is stepped, the temperature spike limit is designed as hysteresis, and as shown in fig. 4, the method specifically includes: if the pre-SCR pre-temperature difference exceeds the first pre-SCR pre-temperature limitSetting a temperature sudden increase state 1, and judging that a front SCR temperature step occurs if the sudden increase is confirmed; if the pre-SCR pre-temperature difference value does not exceed the second pre-SCR pre-temperature limit valueSetting the temperature sudden increase state to 0, and judging that the pre-SCR temperature step does not occur if no sudden increase exists; wherein the first pre-SCR front temperature limit valueIs greater than the second pre-SCR front temperature limit valueAnd the jump back and forth of the sudden increase state caused by the condition of temperature jitter is avoided.
S230, if judging that the pre-SCR temperature step occurs, acquiring the ammonia leakage amount of a downstream model of the pre-SCR and the oxidation rate of the DOC to NH3, and determining the downstream ammonia leakage amount of the pre-SCR according to the ammonia leakage amount of the downstream model of the pre-SCR and the oxidation rate of the DOC to NH 3.
The chemical reaction equation of NH3 oxidation in DOC is shown in the following formulas (1) and (2), specifically:
(1)
(2)
as can be seen from equation (2) above, the NH3 slip from the pre-SCR eventually has a portion converted to NOx flowing into the post-SCR, and controlling urea injection from the post-SCR solely by the NOx sensor may result in underspray.
Based on the above problems, the ammonia leakage amount of the downstream model of the pre-SCR is obtainedThen, the ammonia slip amount downstream of the pre-SCR is determined based on the following formula (3), specifically:
(3)
wherein,ammonia leakage amount is the ammonia leakage amount of a downstream model of the front SCR;the oxidation rate of DOC to NH 3;is the ammonia slip downstream of the pre-SCR.
S240, determining a first ammonia slip conversion NOx value according to the ammonia slip amount of the downstream of the pre-SCR, and determining a second ammonia slip conversion NOx value according to the ammonia slip amount of the downstream model of the pre-SCR.
Based on the above, the ammonia slip amount downstream of the pre-SCR can be calculated by the following formula (4)The amount of conversion to the corresponding NOx, i.e. the first ammonia slip converted NOx value, is specifically:
(4)
wherein,converting the NOx value for the first ammonia slip;the NH3/NOx molar ratio may be obtained by those skilled in the art according to actual circumstances, and the present embodiment is not limited in any way.
The amount of NOx that the NOx sensor cross sensitivity misrecognizes NH3 as NOx, i.e., the second ammonia slip converted NOx value, can be calculated by the following equation (5):
(5)
wherein,the NOx value is converted for the second ammonia slip.
S250, acquiring a NOx sensor measured value obtained through real-time detection of a NOx sensor, and determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value so as to control a rear SCR (selective catalytic reduction) to perform ammonia storage closed-loop control based on the target NOx value.
On the basis of the above, with continued reference to fig. 4, the target NOx value is determined based on the following formula, specifically:
；
wherein,is the target NOx value;-for the NOx sensor measurement;converting a NOx value for the first ammonia slip; is thatThe second ammonia slip converts the NOx value.
According to the technical scheme provided by the embodiment of the invention, the ammonia storage is large when the SCR ammonia is stored at low temperature, and the ammonia storage is small when the SCR ammonia is stored at high Wen Shian, so that ammonia leakage mostly occurs when the temperature is suddenly increased. And the ammonia storage characteristic of the SCR is identified, and whether ammonia leakage occurs or not is judged by judging whether temperature jump occurs before the front SCR, so that the ammonia leakage judgment is more accurate. Because the NOx sensor has the characteristic of cross sensitivity, NH3 leaked by the front SCR can be mistakenly identified as NOx, and the DOC high-oxidability catalyst can oxidize NH3 into NOx, therefore, the NOx actually flowing into the rear SCR needs to be discharged from the cross sensitivity and the NOx generated by oxidation is increased, so that the urea injection control of the rear SCR is more accurate. As shown in fig. 5, the NOx case without correction urea injection and the NOx case with correction urea injection are provided, the NOx case without correction urea injection includes the actual measurement value of the NOx sensor and the ammonia leakage condition of the front SCR, after correction by the urea injection control method provided by the invention, the NOx case with correction urea injection includes the ammonia leakage condition of the front SCR and the actual NOx flowing into the rear SCR, so that the invention can realize more accurate closed-loop control of urea injection, realize flexible adjustment of the rear SCR urea injection, and avoid influencing the exhaust emission level of the engine.
Example III
Fig. 6 is a schematic structural diagram of a urea injection control device according to a third embodiment of the present invention. As shown in fig. 6, the urea injection control device includes:
the temperature step judgment module 310 is configured to obtain a target pre-SCR pre-temperature value when a set engine operating condition is satisfied, and judge whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value;
the ammonia slip conversion NOx value determining module 320 is configured to obtain an ammonia slip amount downstream of the pre-SCR after determining that the pre-SCR temperature step occurs, and determine a first ammonia slip conversion NOx value and a second ammonia slip conversion NOx value based on the ammonia slip amount downstream of the pre-SCR, respectively;
the urea injection control module 330 is configured to perform obtaining a NOx sensor measurement value obtained by detecting a NOx sensor in real time, and determine a target NOx value according to the NOx sensor measurement value, the first ammonia slip converted NOx value, and the second ammonia slip converted NOx value, so as to control the post-SCR to perform ammonia storage closed-loop control based on the target NOx value.
Optionally, the acquiring the target pre-SCR pre-temperature value is specifically configured to:
and acquiring an initial pre-SCR pre-temperature value in a set acquisition time length, and determining a corresponding target pre-SCR pre-temperature value in the set acquisition time length according to the initial pre-SCR pre-temperature value.
Optionally, the step of determining whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value is specifically configured to:
and determining a pre-SCR pre-temperature difference value according to the corresponding target pre-SCR pre-temperature value in the set acquisition time length of two adjacent sections, and judging whether a pre-SCR temperature step occurs according to the pre-SCR pre-temperature difference value.
Optionally, the step of determining whether the pre-SCR temperature step occurs according to the pre-SCR pre-temperature difference value is specifically configured to:
if the front SCR front temperature difference exceeds the first front SCR front temperature limit value, judging that front SCR temperature step occurs;
if the front SCR front temperature difference value does not exceed the second front SCR front temperature limit value, judging that the front SCR temperature step does not occur;
wherein the first pre-SCR temperature limit is greater than the second pre-SCR pre-temperature limit.
Optionally, the method is specifically used for acquiring the downstream ammonia leakage amount of the pre-SCR:
and acquiring the ammonia leakage amount of the downstream model of the pre-SCR and the oxidation rate of the DOC to NH3, and determining the downstream ammonia leakage amount of the pre-SCR according to the ammonia leakage amount of the downstream model of the pre-SCR and the oxidation rate of the DOC to NH 3.
Optionally, the determining the first ammonia slip converted NOx value and the second ammonia slip converted NOx value based on the pre-SCR downstream ammonia slip amount, respectively, is specifically configured to:
and determining a first ammonia slip conversion NOx value according to the ammonia slip amount of the downstream of the pre-SCR, and determining a second ammonia slip conversion NOx value according to the ammonia slip amount of the downstream model of the pre-SCR.
Optionally, the determining a target NOx value according to the NOx sensor measurement value, the first ammonia slip converted NOx value and the second ammonia slip converted NOx value is specifically configured to:
the target NOx value is determined based on the following formula:
；
wherein,is the target NOx value;-for the NOx sensor measurement;converting a NOx value for the first ammonia slip; is thatThe second ammonia slip converts the NOx value.
The urea injection control device provided by the embodiment of the invention can execute the urea injection control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the urea injection control method.
Example IV
Fig. 7 shows a schematic structural diagram of a vehicle 410 that may be used to implement an embodiment of the invention. As shown in fig. 7, the vehicle 410 includes at least one processor 411, and a memory, such as a read only memory (ROM 412), a random access memory (RAM 413), etc., communicatively connected to the at least one processor 411, wherein the memory stores computer programs executable by the at least one processor, and the processor 411 can perform various appropriate actions and processes according to the computer programs stored in the read only memory (ROM 412) or the computer programs loaded from the storage unit 418 into the random access memory (RAM 413). In the RAM 413, various programs and data required for the operation of the vehicle 410 may also be stored. The processor 411, the ROM 412, and the RAM 413 are connected to each other through a bus 414. An I/O (input/output) interface 415 is also connected to bus 414.
Various components in the vehicle 410 are connected to the I/O interface 415, including: an input unit 416 such as a keyboard, a mouse, etc.; an output unit 417 such as various types of displays, speakers, and the like; a storage unit 418, such as a magnetic disk, optical disk, or the like; and a communication unit 419 such as a network card, modem, wireless communication transceiver, etc. The communication unit 419 allows the vehicle 410 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.
The processor 411 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 411 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 411 executes the various methods and processes described above, such as urea injection control methods.
In some embodiments, the urea injection control method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 418. In some embodiments, some or all of the computer program may be loaded and/or installed onto the vehicle 410 via the ROM 412 and/or the communication unit 419. When a computer program is loaded into RAM 413 and executed by processor 411, one or more steps of the urea injection control method described above may be performed. Alternatively, in other embodiments, processor 411 may be configured to execute the urea injection control method in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or a trackball) by which a user can provide input to the vehicle. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A urea injection control method, characterized by comprising:
when the set engine running condition is met, acquiring a target pre-SCR pre-temperature value, and judging whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value;
if the occurrence of the pre-SCR temperature step is judged, acquiring the downstream ammonia slip quantity of the pre-SCR, and respectively determining a first ammonia slip conversion NOx value and a second ammonia slip conversion NOx value based on the downstream ammonia slip quantity of the pre-SCR;
and acquiring a NOx sensor measured value obtained through real-time detection of a NOx sensor, and determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value so as to control the post SCR to perform ammonia storage closed-loop control based on the target NOx value.
2. The urea injection control method according to claim 1, characterized in that the obtaining the target pre-SCR pre-temperature value comprises:
and acquiring an initial pre-SCR pre-temperature value in a set acquisition time length, and determining a corresponding target pre-SCR pre-temperature value in the set acquisition time length according to the initial pre-SCR pre-temperature value.
3. The urea injection control method according to claim 2, characterized in that said determining whether a pre-SCR temperature step occurs according to the target pre-SCR pre-temperature value comprises:
and determining a pre-SCR pre-temperature difference value according to the corresponding target pre-SCR pre-temperature value in the set acquisition time length of two adjacent sections, and judging whether a pre-SCR temperature step occurs according to the pre-SCR pre-temperature difference value.
4. The urea injection control method according to claim 3, characterized in that said determining whether a pre-SCR temperature step occurs according to the pre-SCR pre-temperature difference value comprises:
if the front SCR front temperature difference exceeds the first front SCR front temperature limit value, judging that front SCR temperature step occurs;
if the front SCR front temperature difference value does not exceed the second front SCR front temperature limit value, judging that the front SCR temperature step does not occur;
wherein the first pre-SCR temperature limit is greater than the second pre-SCR pre-temperature limit.
5. The urea injection control method according to claim 1, characterized in that the obtaining the ammonia slip downstream of the pre-SCR comprises:
and acquiring the ammonia leakage amount of the downstream model of the pre-SCR and the oxidation rate of the DOC to NH3, and determining the downstream ammonia leakage amount of the pre-SCR according to the ammonia leakage amount of the downstream model of the pre-SCR and the oxidation rate of the DOC to NH 3.
6. The urea injection control method according to claim 5, characterized in that the determining a first ammonia slip converted NOx value and a second ammonia slip converted NOx value, respectively, based on the pre-SCR downstream ammonia slip amount, comprises:
and determining a first ammonia slip conversion NOx value according to the ammonia slip amount of the downstream of the pre-SCR, and determining a second ammonia slip conversion NOx value according to the ammonia slip amount of the downstream model of the pre-SCR.
7. The urea injection control method according to claim 1, characterized in that the determining a target NOx value from the NOx sensor measurement value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value comprises:
the target NOx value is determined based on the following formula:
；
wherein,is the target NOx value; />-for the NOx sensor measurement; />Converting a NOx value for the first ammonia slip; is->The second ammonia leakage is converted into NOAnd x.
8. A urea injection control device, characterized by comprising:
the temperature step judgment module is used for acquiring a target pre-SCR front temperature value when the set engine running condition is met, and judging whether a pre-SCR temperature step occurs according to the target pre-SCR front temperature value;
the ammonia leakage conversion NOx value determining module is used for acquiring the downstream ammonia leakage amount of the front SCR after judging that the front SCR temperature step occurs, and respectively determining a first ammonia leakage conversion NOx value and a second ammonia leakage conversion NOx value based on the downstream ammonia leakage amount of the front SCR;
the urea injection control module is used for executing acquisition of a NOx sensor measured value obtained through real-time detection of a NOx sensor, determining a target NOx value according to the NOx sensor measured value, the first ammonia slip conversion NOx value and the second ammonia slip conversion NOx value, and controlling the post SCR to perform ammonia storage closed-loop control based on the target NOx value.
9. A vehicle, characterized in that the vehicle comprises:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the urea injection control method of any one of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to execute the urea injection control method according to any one of claims 1-7.
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