CN207847736U - SCR system urea liquid automatic control device - Google Patents
SCR system urea liquid automatic control device Download PDFInfo
- Publication number
- CN207847736U CN207847736U CN201820124974.4U CN201820124974U CN207847736U CN 207847736 U CN207847736 U CN 207847736U CN 201820124974 U CN201820124974 U CN 201820124974U CN 207847736 U CN207847736 U CN 207847736U
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- CN
- China
- Prior art keywords
- urea
- feeder
- tank
- temperature sensor
- catalyst converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a kind of SCR system urea liquid automatic control devices, including urea tank, urea tank is connected with urea feeder by urea efferent duct, urea return duct is additionally provided between urea feeder and urea tank, urea feeder is connected to exhaust pipe by pressure duct, Intaker controller is installed on pressure duct, the urea output end of urea feeder is connected with urea nozzle, urea nozzle is set to the inlet end of catalyst converter, catalyst converter is connected to exhaust pipe, intake air temperature sensor is installed on catalyst converter, air outlet temperature sensor and NOx sensor, further include electronic control unit ECU；Pass through the present apparatus, in engine start and operational process, the functions such as urea system self-test, urea system are noted in advance, urea etc. is to be fed, urea system charging, urea system emptying can be sequentially completed, and each section is automatically performed, both exhaust emissions quality had been ensure that, SCR system is also set to empty thoroughly, and simple in structure, low cost.
Description
Technical field
The utility model is related to SCR system technical fields more particularly to a kind of SCR system urea liquid to automatically control dress
It sets.
Background technology
The complicated physical and chemical reaction occurred in SCR system includes：The injection of aqueous solution of urea, atomization, evaporation,
Urea (ammonia and urea chemical reaction product) hydrolysis and pyrolysis gas-phase chemical reaction and NOx catalyst surface with
The catalytic surface chemical reaction that NH3 occurs.Its primary chemical equation is as follows：
NO+NO2+2NH3→2N2+3H2O
4NO+O2+4NH3→4N2+6H2O
2NO2+O2+4NH3→3N2+6H2O
The product ideally reacted is mainly nontoxic nitrogen and water.Urea dosage in SCR system is final
It is controlled by engine management system, the straying quatity of urea has to match with the concentration of NOx.The straying quatity of urea is very few, then
It is horizontal that due processing is not achieved, the straying quatity of urea is excessive, then extra ammonia can be made to be discharged into air, leads to new pollution.
Therefore SCR system control is most important, directly affects quality, SCR system used at present is what offshore company produced, mainly
It is not thorough in the presence of emptying, the defects of system complex, price is high.
Utility model content
The technical problem to be solved by the utility model is to provide it is a kind of with self-test, air emptying function SCR system urea
Solution automatic control device.
In order to solve the above technical problems, the technical solution of the utility model is：SCR system urea liquid automatically controls dress
It sets, is connected with the exhaust pipe of engine, including urea tank, the urea tank is connected with urea feeder by urea efferent duct,
Urea return duct is additionally provided between the urea feeder and the urea tank, the urea feeder is connected by pressure duct
To the exhaust pipe, Intaker controller, the urea output end connection of the urea feeder are installed on the pressure duct
There are urea nozzle, the urea nozzle to be set to the inlet end of catalyst converter, the catalyst converter is connected to the exhaust pipe, the catalysis
The inlet end of device is equipped with intake air temperature sensor, and the outlet side of the catalyst converter is equipped with air outlet temperature sensor and nitrogen oxidation
Object sensor, the Intaker controller, the intake air temperature sensor, the air outlet temperature sensor and the nitrogen oxides
Sensor is respectively connected to electronic control unit ECU.
The urea feeder includes feeder shell as a preferred technical solution, is set in the feeder shell
The urea input terminal of diaphragm pump, the diaphragm pump is equipped with import check valve, and the urea output end of the diaphragm pump is equipped with outlet list
To valve, the output end of the Outlet check valves is respectively communicated to the urea return duct and the urea nozzle.
The urea tank includes tank body as a preferred technical solution, and liquid level sensor and urea are equipped in the tank body
Temperature sensor, the liquid level sensor and the urea temperature sensor are connected separately to the electronic control unit ECU.
As the improvement to above-mentioned technical proposal, the Intaker controller includes the gas being connected on the pressure duct
Valve, the air valve are connected with Electromagnetically driven valve, and the electromagnetic drive valve signal is connected to the electronic control unit ECU.
By adopting the above-described technical solution, SCR system urea liquid automatic control device, the exhaust pipe phase with engine
Even, including urea tank, the urea tank are connected with urea feeder, the urea feeder and the urine by urea efferent duct
Urea return duct is additionally provided between plain tank, the urea feeder is connected to the exhaust pipe, the high pressure by pressure duct
Intaker controller is installed, the urea output end of the urea feeder is connected with urea nozzle, the urea spray on pipeline
Mouth is set to the inlet end of catalyst converter, and the catalyst converter is connected to the exhaust pipe, and the inlet end of the catalyst converter is equipped with air inlet
The outlet side of temperature sensor, the catalyst converter is equipped with air outlet temperature sensor and NOx sensor, described into gas control
Device, the intake air temperature sensor, the air outlet temperature sensor and the NOx sensor processed are respectively connected to electricity
Control unit ECU；The utility model has the beneficial effects that：It, can be successively in engine start and operational process by the present apparatus
Complete urea system self-test, the functions such as to be fed, urea system charging, the urea system such as urea system note in advance, urea empty, and
Each section is automatically performed, and both ensure that exhaust emissions quality, SCR system is also made to empty thoroughly, and simple in structure, low cost.
Description of the drawings
The following drawings is only intended in doing schematic illustration and explanation to the utility model, does not limit the model of the utility model
It encloses.Wherein：
Fig. 1 is the schematic diagram of the utility model embodiment；
In figure：1- exhaust pipes；2- urea tanks；3- urea efferent ducts；4- feeder shells；5- urea return ducts；6- high pressures
Pipeline；7- diaphragm pumps；8- import check valves；9- Outlet check valves；10- urea nozzles；11- catalyst converters；12- air-temperature sensings
Device；13- air outlet temperature sensors；14- NOx sensors；15- electronic control unit ECU；17- Intaker controllers.
Specific implementation mode
With reference to the accompanying drawings and examples, the utility model is expanded on further.In the following detailed description, only pass through
Bright mode describes certain exemplary embodiments of the utility model.Undoubtedly, those skilled in the art can be with
It recognizes, it, can be with a variety of different modes to described without departing from the spirit and scope of the utility model
Embodiment is modified.Therefore, attached drawing and description are regarded as illustrative in nature, rather than the protection for limiting claim
Range.
As shown in Figure 1, SCR system urea liquid automatic control device, is connected, including urea with the exhaust pipe 1 of engine
Tank 2, the urea tank 2 include tank body, liquid level sensor and urea temperature sensor are equipped in the tank body, for the urine
Urea level and temperature carry out automatically controlling during plain tank 2 carries out.
The urea tank 2 is connected with urea feeder, the urea feeder and the urea tank by urea efferent duct 3
Urea return duct 5 is additionally provided between 2, the urea feeder is connected to the exhaust pipe 1, the high pressure by pressure duct 6
Intaker controller 17 is installed, the urea feeder includes feeder shell 4, is set in the feeder shell 4 on pipeline 6
It is equipped with import check valve 8 in the urea input terminal of diaphragm pump 7, the diaphragm pump 7, the urea output end of the diaphragm pump 7 is equipped with
The output end of Outlet check valves 9, the Outlet check valves 9 is respectively communicated to the urea return duct 5 and the urea nozzle 10.
Wherein, the Intaker controller 17 includes the air valve being connected on the pressure duct 6, and the air valve is connected with electromagnetic drive
Valve, the electromagnetic drive valve signal are connected to the electronic control unit ECU15.
The urea output end of the urea feeder is connected with urea nozzle 10, and the urea nozzle 10 is set to catalyst converter 11
Inlet end, the catalyst converter 11 is connected to the exhaust pipe 1, and the inlet end of the catalyst converter 11 is equipped with air-temperature sensing
The outlet side of device 12, the catalyst converter 11 is equipped with air outlet temperature sensor 13 and NOx sensor 14, and the liquid level passes
Sensor, the urea temperature sensor, the Intaker controller 17, the intake air temperature sensor 12, the air outlet temperature
Sensor 13 and the NOx sensor 14 are respectively connected to electronic control unit ECU15, and the electronic control unit ECU15's is specific
Structure is the content known to those of ordinary skill in the art, is no longer described in detail herein.
It is pre- can be sequentially completed urea system self-test, urea system in engine start and operational process for the present embodiment
The functions such as note, urea etc. are to be fed, urea system feeds, urea system emptying, and each section is automatically performed, and both ensure that tail
Gas discharge quality also makes SCR system empty thoroughly, and simple in structure, low cost.
The work(such as to be fed, urea system charging, the urea system emptyings such as urea system self-test, urea system note in advance, urea
Details are provided below for energy：
Urea system self-test：When automobile key switch goes to the positions ON, the urea feeder Power-On Self-Test, driving electricity
Machine turns to make a reference metal point on driving wheel and the monitoring point on circuit board to after just, driving motor stops operating,
Complete self-test.
Urea system is noted in advance：
1, each engine start success, system can all start the pre- note stage when bringing into operation.In the urea feeder
The diaphragm pump 7 start full-speed operation, urea liquid by the diaphragm pump 7 recycle and flow back into the urea tank 2, with
Just the air in emptying system, the process continue 30s.
If 2, note stage success in advance：1. the Electromagnetically driven valve in advance note latter stage in stage be powered open, compressed air into
Enter the urea feeder；2. checking urea pressure；3. the diaphragm pump 7 is stopped.
If 3, the note stage is unsuccessful for the first time in advance：1. the Electromagnetically driven valve powers off immediately, air, the diaphragm are cut off
Pump 7 will full-speed operation 30s again；2. this process is 20 times repeatable, if still unsuccessful after 20 times, SCR pumps state and controls institute
State urea feeder mistake.
Urea etc. is to be fed：In note latter stage in stage in advance, the Electromagnetically driven valve is opened, and the urea feeder stops.Pressure
Contracting air it is straight enter the urea nozzle 10, the diaphragm pump 7 do not turn, and does not spray urea.The urea feeder is now ready for
It feeds, the nitrogen oxides and delivery temperature that feeding stage is generated by the electronic control unit ECU15 according to engine are controlled
System.Unless meeting the condition for spraying into urea, the urea feeder will not be initially added into urea, but when engine operating, it is empty
Gas is continuously added by the urea feeder, the urea nozzle 10, to avoid spray nozzle clogging.
Urea system feeds：In feeding stage, air pressure adjusting to 40kPa, air continuously passes through the electromagnetic drive
Valve enters the urea nozzle 10.When 11 inlet and outlet delivery temperature of the catalyst converter all reaches 200QC or more, not with
The relevant OBD failure codes of SCR system, 2 liquid level of the urea tank are higher than 6%, and the air pressure is higher than 0.4MPa, and urea
Pressure is 0.3MPa, and when the urea temperature in the urea tank 2 is more than -5 DEG C, the electronic control unit ECU15 is according to nitrogen oxides
Algorithm sends out injection order.
Urea system empties：When key switch goes to OFF (disconnection) position, system enters removing stage.Compressed air from
Flowed through in the urea nozzle 10 and the urea feeder, any remaining urea is discharged air from system, otherwise this
A little drops may block each check valve or the urea nozzle 10 in the urea feeder, this stage will continue 30s, then
System is closed.
Each key switch closes cycle, can all carry out emptying work, if engine during normal operation, SCR systems
System failure becomes existing failure, and SCR system will close.
The advantages of basic principles and main features and the utility model of the utility model have been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the present utility model is not limited to the above embodiments, described in above embodiments and description
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (4)
1.SCR system urea liquid automatic control devices, are connected with the exhaust pipe of engine, it is characterised in that：Including urea tank,
The urea tank is connected with urea feeder by urea efferent duct, is additionally provided between the urea feeder and the urea tank
Urea return duct, the urea feeder are connected to the exhaust pipe by pressure duct, be equipped on the pressure duct into
The urea output end of gas control device, the urea feeder is connected with urea nozzle, and the urea nozzle is set to catalyst converter
Inlet end, the catalyst converter are connected to the exhaust pipe, and the inlet end of the catalyst converter is equipped with intake air temperature sensor, described
The outlet side of catalyst converter is equipped with air outlet temperature sensor and NOx sensor, the Intaker controller, the air inlet
Temperature sensor, the air outlet temperature sensor and the NOx sensor are respectively connected to electronic control unit ECU.
2. SCR system urea liquid automatic control device as described in claim 1, it is characterised in that：The urea feeder
Including feeder shell, diaphragm pump is set in the feeder shell, the urea input terminal of the diaphragm pump is unidirectional equipped with import
Valve, the urea output end of the diaphragm pump are equipped with Outlet check valves, and the output ends of the Outlet check valves is respectively communicated to described
Urea return duct and the urea nozzle.
3. SCR system urea liquid automatic control device as described in claim 1, it is characterised in that：The urea tank includes
Tank body, the tank body is interior to be equipped with liquid level sensor and urea temperature sensor, and the liquid level sensor and the urea temperature pass
Sensor is connected separately to the electronic control unit ECU.
4. SCR system urea liquid automatic control device as described in claim 1, it is characterised in that：The air inlet control dress
The air valve including being connected on the pressure duct is set, the air valve is connected with Electromagnetically driven valve, the electromagnetic drive valve signal
It is connected to the electronic control unit ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820124974.4U CN207847736U (en) | 2018-01-24 | 2018-01-24 | SCR system urea liquid automatic control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820124974.4U CN207847736U (en) | 2018-01-24 | 2018-01-24 | SCR system urea liquid automatic control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207847736U true CN207847736U (en) | 2018-09-11 |
Family
ID=63412702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820124974.4U Expired - Fee Related CN207847736U (en) | 2018-01-24 | 2018-01-24 | SCR system urea liquid automatic control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207847736U (en) |
-
2018
- 2018-01-24 CN CN201820124974.4U patent/CN207847736U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180911 Termination date: 20200124 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |