CN108301905A - Ammonia urea double ejecting system and its control method - Google Patents
Ammonia urea double ejecting system and its control method Download PDFInfo
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- CN108301905A CN108301905A CN201810181564.8A CN201810181564A CN108301905A CN 108301905 A CN108301905 A CN 108301905A CN 201810181564 A CN201810181564 A CN 201810181564A CN 108301905 A CN108301905 A CN 108301905A
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- urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- 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 kind of ammonia urea double ejecting systems comprising urea box, urea pump, urea nozzle, ammonia storage tank, ammonia metering valve, ammonia nozzle, ECU and preprocessor.The ammonia urea double ejecting system of the present invention, based on being sprayed with urea, ammonia injection only carries out under the special operation conditions such as cold start-up, warm low, the urea icing of row or SCR conversion efficiency superelevation, can solve the problems, such as that transformation efficiency is low under the low row's temperature of six urea system of state, cold start-up operating mode, easily Crystallization Plugging occurs；It solves the problem of quickly meet discharge firstly the need of defrosting when six urea injection system Han Qu work of state；Also it can solve the problems, such as that six SCR conversion efficiency of state 99% is difficult to realize；And solve the problems, such as that ammonia spraying system promotes the use of inconvenience.
Description
Technical field
The present invention relates to a kind of ammonia urea double ejecting system and its control methods.It post-processes and leads applied to diesel engine vent gas
Domain.
Background technology
With the implementation of four emission regulation of commercial car state, vehicle must install nitrogen oxides (NOx) discharging processing device additional.
Chinese medium and heavy-duty engines generally use selective catalytic reduction (SCR) technology path, i.e., by standard urea for vehicle
Aqueous solution is ejected into exhaust, and the ammonia generated using its decomposition carries out selective catalytic reduction to NOx, generates harmless nitrogen
And water.
Country announces will be in six emission regulation of the year two thousand twenty state of enforcement, and NOx emission limit value substantially reduces, simultaneously for cold start-up
Strict regulations have also been made in NOx emission under row's temperature operating mode low with engine.It is influenced by urea self character, is less than in row's temperature
At 200 DEG C, easily there is the problem of hydrolysis of urea is not supplemented and crystallized.It can cause preprocessor crystallization, discharge the problems such as exceeded.
And urea freezes at -11 DEG C, therefore when vehicle is run at -11 DEG C, it is impossible to meet emission limit.It is sent out simultaneously in order to reduce
Motivation oil consumption starts to tend to no EGR schemes at present in industry, reduces NOx only with SCR, it is necessary to which 99% or more SCR turns
Change efficiency, traditional urea injection system is difficult to reach this target.
Because generally starting to develop ammonia spraying system in the industry, urea system can thoroughly be evaded by directly spraying ammonia
The problem of crystallization, icing.If document 1 (CN103541796A) is related to a kind of ammonia gas metering method for solid ammonia storing system,
It is characterized in that being as follows：1) working condition signal of engine is sent out by ECU, and instruction DCU is defeated according to the temperature height of system
Go out signal and changes aperture to solenoid valve；Ammonia in control solid ammonia storage material uniformly exports；2) when DCU obtains analog signal
Input, and when the display internal pressure of pressure sensor is more than 200kPa, and the temperature inside temperature sensor display
More than 60 DEG C, just start solenoid valve；Made using the combination of temperature sensor, pressure sensor, filter, pressure maintaining valve and solenoid valve
With being adapted in SCR used in state 4 and above discharge standard, be also applied for following FCEV technologies.
The exhaust pipe parallel connection of engine is divided into a and b two-way by patent document 2 (CN202673414U), wherein all the way
Installation storage ammonia system on pipeline, in the way of waste heat, heating of Activated storage ammoniate releases ammonia, is arranged according to engine
Gas operating mode is horizontal, ammonia is imported by control unit the front end of SCR postprocessor, realizes no liquid urea conveying injection and atomization
The SCR system of decomposition；The system has flexible feature, emission control target, valence when can not only meet vehicle low-temperature cool starting
Honest and clean, reliability is high, easy to use；Suitable for 4 system above of light-duty diesel vehicle and medium-size diesel vehicle SCR states, can also apply
In FCEV systems, meet the application demand of future automobile industry, there is practical value.
Patent document 3 (CN202673413U) is related to a kind of system of exhaust tube remaining heat mode storing and supplying ammonia, and feature exists
In：Outward flange disk is sleeved on exhaust pipe, and pressure-resistant top tank structure jacket casing side on exhaust pipe is fixedly connected with outward flange disk, the other side
It is fixedly connected with another outward flange disk, inner flange is sleeved on pressure-resistant top tank structure cylinder and is fixedly connected, and pressure-resistant tank wall jacket casing exists
Side is fixedly connected with inner flange on inner flange, and the pressure-resistant tank wall cylinder other side is fixedly connected with another inner flange,
Two panels inner flange and pressure-resistant top tank structure cylinder, pressure-resistant tank wall cylinder form cavity, filled solid ammonia-storing material in cavity, autoclave
Temperature sensor senses end is inserted into solid ammonia storage material and is connected on pressure-resistant tank wall cylinder, and electronic control unit control terminal passes through
The accurate proportioning valve of signal wire connection, air inlet pipe connect SCR postprocessor inlet end, and SCR postprocessor outlet side connects exhaust pipe；
The waste heat of engine exhaust is heated, and by control unit and one group of solenoid valve or proportioning valve, realizes the dosage conveying of ammonia simultaneously
It is convenient to import SCR aftertreatment system, realize the removal to NOx.
For system disclosed in patent document 1, patent document 2 and patent document 3, it is all made of ammonia gas absorption technology, ammonia
Belong to harmful influence, the storage that fills of ammonia tank is required for certain qualification, the rare of the fueling station of ammonia tank that will make to user
With bringing great inconvenience, therefore urea injection system all-round popularization can not be substituted completely.
Invention content
It is an object of the present invention to provide a kind of ammonia urea double ejecting system and its control methods, pass through the double injections of ammonia urea
System thoroughly solves the problems, such as that transformation efficiency is low under the low row's temperature of six urea system of state, cold start-up operating mode, easily Crystallization Plugging occurs.
The present invention solves technical problem and adopts the following technical scheme that：A kind of ammonia urea double ejecting system comprising urea
Case, urea pump, urea nozzle, ammonia storage tank, ammonia metering valve, ammonia nozzle, ECU and preprocessor；
The import of the urea pump is connected to the urea box, and the outlet of the urea pump is connected to the urea nozzle,
The urea nozzle is installed on the preprocessor, for spraying urea solution into preprocessor；
The ammonia storage tank is connected to by ammonia metering valve with ammonia nozzle, and the ammonia nozzle is installed on the preprocessor
On, for spraying ammonia into preprocessor；
ECU is connect with the urea nozzle, the injection for controlling the urea nozzle；Moreover, the ECU also with ammonia
Metering valve connects, and is ejected into the ammonia after metering in preprocessor by ammonia nozzle for controlling ammonia metering valve.
Optionally, the ammonia urea double ejecting system further includes exhaust temperature sensor, and the exhaust temperature sensor is installed on
On the preprocessor, and it is connected to the ECU, for exporting the temperature of the gas in current preprocessor to ECU.
Optionally, the ammonia urea double ejecting system further includes environment temperature sensor, the environment temperature sensing
Device is connected to the ECU, for exporting current vehicle local environment temperature to ECU.
Optionally, the ammonia urea double ejecting system further includes urea temperature sensor, the urea temperature sensing
Device is connected to the ECU, for exporting in current urea box urea temperature to ECU.
Optionally, the ammonia urea double ejecting system further includes urea liquid level sensor, the urea level sensing
Device is connected to the ECU, and the ECU is sent to for exporting the liquid level of current urea solution of urea box.
Optionally, the ammonia urea double ejecting system further includes Urea water valve and ammonia storage tank heater, described
Urea water valve signal is connected to the ECU, and is set on the Urea water route, and the Urea water route is used for
Urea solution in heating urea case, the ammonia storage tank heater is connected to the ECU, to ammonia storage tank under the control of the ECU
It is heated.
The present invention solves technical problem and also adopts the following technical scheme that：A kind of controlling party of ammonia urea double ejecting system
Method comprising：
S10, the temperature that the gas inside preprocessor is detected by exhaust temperature sensor, when the temperature of the gas in preprocessor
When degree is less than a certain threshold value, ECU control ammonia storage tank heater unlatchings heat ammonia storage tank and control the metering of ammonia metering valve
Ammonia is sprayed, and detects urea solution temperature stored in urea box；Otherwise, step S30 is executed；
S20, the urea solution temperature stored by urea box are more than or equal to -5 DEG C, and control urea pump, which is built, presses and urea nozzle
It does not spray, and detects the temperature of the gas inside preprocessor, when the temperature of the gas in preprocessor is higher than the threshold value,
Ammonia metering valve is closed, ECU controls urea nozzle according to engine calibration data and opens injection urea；When stored in urea box
Urea solution temperature be less than -5 DEG C, ECU controls Urea water valve and opens, and makes urea solution temperature stored in urea box
Between -5 DEG C to 5 DEG C, S20 is re-executed；
S30, urea solution temperature stored in urea box is detected, the urea solution temperature stored by urea box is more than etc.
In -5 DEG C, ammonia metering valve is closed, ECU controls urea nozzle according to engine calibration data and opens injection urea；Work as urea box
Interior stored urea solution temperature is less than -5 DEG C, and ECU controls Urea water valve and opens, and makes urine stored in urea box
Plain liquid temperature be in -5 DEG C to 5 DEG C between after, close ammonia metering valve, ECU according to engine calibration data control urea nozzle
Open injection urea；
Wherein, when SCR conversion efficiency is higher than 95%, ECU control ammonia metering valves are opened simultaneously with urea nozzle.
Optionally, wherein when urea level is less than 2%, ECU controls urea nozzle and stops injection urea, and to user
Alarm urea runs out of；Ammonia injection is controlled simultaneously.
The present invention has the advantages that：The ammonia urea double ejecting system of the present invention, sprayed with urea based on, ammonia
Injection only carries out under the special operation conditions such as cold start-up, warm low, the urea icing of row or SCR conversion efficiency superelevation, can solve state six
Transformation efficiency is low under the low row's temperature of urea system, cold start-up operating mode, easily the problem of Crystallization Plugging occurs；Solve six urea injection system of state
Firstly the need of defrosting when the areas Tong Han work, it can not quickly meet the problem of discharge；Also it is difficult that six SCR conversion efficiency of state 99% can be solved
The problem of to realize；And solve the problems, such as that ammonia spraying system promotes the use of inconvenience.
Description of the drawings
Fig. 1 is the structural schematic diagram of the ammonia urea double ejecting system of the present invention；
The mark in the figure shows：1- urea boxes；2- urea pumps；3- urea nozzles；4- ammonia storage tanks；5- ammonia metering valves；6-
Ammonia nozzle；7-ECU；8- preprocessors；9- exhaust temperature sensors；10- environment temperature sensors；11- urea temperature sensors；
12- Urea water valves；13- urea liquid level sensors；14- ammonia storage tank heaters.
Specific implementation mode
Technical scheme of the present invention is further elaborated with reference to embodiment and attached drawing.
Embodiment 1
Present embodiments provide a kind of ammonia urea double ejecting system comprising urea box 1, urea pump 2, urea nozzle 3,
Ammonia storage tank 4, ammonia metering valve 5, ammonia nozzle 6, ECU 7, preprocessor 8, exhaust temperature sensor 9, environment temperature sensor 10, urine
Plain temperature sensor 11, Urea water valve 12, urea liquid level sensor 13 and ammonia storage tank heater 14.
1 storage standard automobile urea liquid of urea box pressurizes pumping urea solution to urea nozzle 3 by urea pump 2, and ECU 7 is controlled
The urea solution of atomization is ejected into preprocessor 8 by urea nozzle 3 processed, is reacted.
That is, the import of the urea pump 2 is connected to the urea box 1, the outlet of the urea pump is connected to the urea
Nozzle 3, the urea nozzle 3 are installed on the preprocessor 8, for spraying urea solution into preprocessor 8.
Storage liquefied ammonia or absorption ammonia in ammonia storage tank 4, ECU 7 control ammonia storage tank heater 14 by exhaust or electrical heating to storage
Ammonia tank 4 is heated to discharge ammonia.After ammonia after metering is ejected by the control ammonias of ECU 7 metering valve 5 by ammonia nozzle 6
In processor 8.
That is, the ammonia storage tank 4 is connected to by ammonia metering valve 5 with ammonia nozzle 6, the ammonia nozzle 6 is installed on described
On preprocessor 8, for spraying ammonia into preprocessor 8.
Exhaust temperature sensor 9 is installed on the preprocessor 8, the temperature for exporting the gas in current preprocessor 8；
Environment temperature sensor 10 is for exporting current vehicle local environment temperature；Urea temperature sensor 11 is for exporting current urea
Urea temperature in case, urea liquid level sensor 13 is for exporting urea level in current urea box.
Also, the exhaust temperature sensor 9, environment temperature sensor 10, urea temperature sensor 11 and urea level sensing
13 equal signal of device is connected to the ECU7, and the signal detected is transferred to ECU7.
The ammonia urea double ejecting system further includes Urea water route, and the Urea water route is used for heating urea
Urea solution in case 1 prevents the temperature of the urea solution of urea box 1 too low, and is provided on the Urea water route described
Urea water valve 12, the Urea water valve 12 is controlled by ECU and is opened and closed, when the Urea water valve 12 is opened,
Urea water route is connected to, heating urea liquid, and when the Urea water valve 12 is closed, Urea water route is closed, and stops adding
Hot urea solution.
The ammonia urea double ejecting system of the present invention, sprayed with urea based on, ammonia injection only in cold start-up, row's temperature it is low,
It is carried out under the special operation conditions such as urea icing or SCR conversion efficiency superelevation, the low row's temperature of six urea system of state, cold start-up work can be solved
Transformation efficiency is low under condition, easily the problem of Crystallization Plugging occurs；It solves when six urea injection system Han Qu of state works firstly the need of solution
Freeze, can not quickly meet the problem of discharge；Also it can solve the problems, such as that six SCR conversion efficiency of state 99% is difficult to realize；And it solves
Ammonia spraying system promotes the use of inconvenient problem.
Embodiment 2
A kind of control method of ammonia urea double ejecting system is present embodiments provided, including：
S10, the temperature that the gas inside preprocessor 8 is detected by exhaust temperature sensor 7, the gas in preprocessor 8
Temperature when being less than a certain threshold value (200 DEG C), ECU 7, which controls ammonia storage tank heater 14 and opens, to be heated and is controlled to ammonia storage tank 4
5 metered injection ammonia of ammonia metering valve processed.
When vehicle cold-start, temperature is relatively low in preprocessor 8, if crystallization, transformation efficiency easily occurs in injection urea at this time
Low problem.Ammonia metering valve 5 is controlled by ECU 7 and sprays ammonia, and the discharged nitrous oxides of diesel vehicle can be reduced by ammonia.
S20, the urea solution temperature stored by urea box 1 are higher than -5 DEG C, and control urea pump 2, which is built, presses and urea nozzle 3
It does not spray, until row's temperature rises to 200 DEG C or more, closes ammonia metering valve 5, ECU 7 controls urea according to engine calibration data
Nozzle 3 opens injection urea.
If S30, urea temperature are less than -5 DEG C, control Urea water valve 12 is opened, and is controlled after urea temperature rises to 5 DEG C
Urea water valve is closed, and control urea pump 2 builds pressure at this time and urea nozzle 3 is not sprayed, and is controlled Urea water valve 12 and opened
It closes and urea temperature is maintained between -5 DEG C to 5 DEG C.Until after row's temperature rises to 200 DEG C or more, ammonia metering valve 5, ECU 7 are closed
Injection urea is opened according to engine calibration data control urea nozzle 3.
In S40, vehicle operation, when row's temperature is less than 200 DEG C, injection ammonia is without spraying urea, when row's temperature is higher than 200 DEG C
And SCR conversion efficiency be not higher than 95% when, injection urea without spray ammonia.
S50, when SCR conversion efficiency is higher than 95%, 95% NOx conversion by urea reaction, part higher than 95%
NOx is reacted by ammonia.ECU 7 controls ammonia metering valve 5 and is opened simultaneously with urea nozzle 3 at this time.It can be swollen after being sprayed due to ammonia
Swollen heat absorption, optimization urea nozzle 3 is arranged in the front end of ammonia metering valve 5, to ensure that urea has optimal decomposition environment.By mixed
Injection is closed, the preprocessor internal ammonia distribution consistency degree of optimization can be realized, to improve transformation efficiency.
S60, when urea level be less than 2% when, ECU 7 control urea nozzle 3 stop injection urea, and to user alarm carry
Show that urea runs out of.Ammonia injection is controlled simultaneously, is discharged to avoid vehicle exceeded.
The sequencing of above example is only for ease of description, can not represent the quality of embodiment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (8)
1. a kind of ammonia urea double ejecting system, which is characterized in that including urea box, urea pump, urea nozzle, ammonia storage tank, ammonia
Gas metering valve, ammonia nozzle, ECU and preprocessor；
The import of the urea pump is connected to the urea box, and the outlet of the urea pump is connected to the urea nozzle, described
Urea nozzle is installed on the preprocessor, for spraying urea solution into preprocessor；
The ammonia storage tank is connected to by ammonia metering valve with ammonia nozzle, and the ammonia nozzle is installed on the preprocessor,
For spraying ammonia into preprocessor；
ECU is connect with the urea nozzle, the injection for controlling the urea nozzle；Moreover, the ECU is also measured with ammonia
Valve connects, and is ejected into the ammonia after metering in preprocessor by ammonia nozzle for controlling ammonia metering valve.
2. ammonia urea double ejecting system according to claim 1, which is characterized in that further include exhaust temperature sensor, it is described
Exhaust temperature sensor is installed on the preprocessor, and is connected to the ECU, for exporting the gas in current preprocessor
Temperature is to ECU.
3. ammonia urea double ejecting system according to claim 2, which is characterized in that further include environment temperature sensor,
The environment temperature sensor is connected to the ECU, for exporting current vehicle local environment temperature to ECU.
4. ammonia urea double ejecting system according to claim 3, which is characterized in that further include urea temperature sensor,
The urea temperature sensor is connected to the ECU, for exporting in current urea box urea temperature to ECU.
5. ammonia urea double ejecting system according to claim 4, which is characterized in that further include urea liquid level sensor,
The urea liquid level sensor is connected to the ECU, for export the liquid level of current urea solution of urea box be sent to it is described
ECU。
6. ammonia urea double ejecting system according to claim 5, which is characterized in that further include Urea water valve and storage
Ammonia tank heater, the Urea water valve signal are connected to the ECU, and are set on the Urea water route, described
Urea water route is for the urea solution in heating urea case, and the ammonia storage tank heater is connected to the ECU, in the ECU
Control under ammonia storage tank is heated.
7. a kind of control method of ammonia urea double ejecting system, which is characterized in that including：
S10, the temperature that the gas inside preprocessor is detected by exhaust temperature sensor, when the temperature of the gas in preprocessor is low
When a certain threshold value, ECU control ammonia storage tank heater unlatchings heat ammonia storage tank and control ammonia metering valve metered injection
Ammonia, and detect urea solution temperature stored in urea box；Otherwise, step S30 is executed；
S20, the urea solution temperature stored by urea box are more than or equal to -5 DEG C, and control urea pump builds pressure and urea nozzle is not sprayed
It penetrates, and detects the temperature of the gas inside preprocessor, when the temperature of the gas in preprocessor is higher than the threshold value, close
Ammonia metering valve, ECU control urea nozzle according to engine calibration data and open injection urea；When urine stored in urea box
Plain liquid temperature is less than -5 DEG C, and ECU controls Urea water valve and opens, and makes at urea solution temperature stored in urea box
Between -5 DEG C to 5 DEG C, S20 is re-executed；
Stored urea solution temperature in S30, detection urea box, when urea solution temperature stored in urea box is more than or equal to -5
DEG C, ammonia metering valve is closed, ECU controls urea nozzle according to engine calibration data and opens injection urea；When institute in urea box
The urea solution temperature of storage is less than -5 DEG C, and ECU controls Urea water valve and opens, and makes urea solution stored in urea box
Temperature be in -5 DEG C to 5 DEG C between after, close ammonia metering valve, ECU according to engine calibration data control urea nozzle open
Spray urea；
Wherein, when SCR conversion efficiency is higher than 95%, ECU control ammonia metering valves are opened simultaneously with urea nozzle.
8. the control method of ammonia urea double ejecting system according to claim 7, which is characterized in that wherein, work as urea
When liquid level is less than 2%, ECU controls urea nozzle and stops injection urea, and is run out of to user's alarm urea；It controls simultaneously
Ammonia sprays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN108301905B (en) | 2023-08-25 |
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