CN103993936A - Air pressure type urea metering spraying system easy to control - Google Patents
Air pressure type urea metering spraying system easy to control Download PDFInfo
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- CN103993936A CN103993936A CN201410211342.8A CN201410211342A CN103993936A CN 103993936 A CN103993936 A CN 103993936A CN 201410211342 A CN201410211342 A CN 201410211342A CN 103993936 A CN103993936 A CN 103993936A
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- urea
- pressure
- pressurized container
- source
- solenoid valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an air pressure type urea metering spraying system easy to control. The metering spraying system comprises a urea tank, a compressed air source, urea spraying mechanisms and a controller, and two paths of branch systems which are connected with the compressed air source, independently, coordinately and alternately bear urea supplying and spraying functions and are composed of urea pressure containers and the urea spraying mechanisms are arranged. According to the branch systems, the urea pressure containers are provided with electromagnetic valves which are connected with the compressed air source and provided with air inlet electromagnetic valves and air exhaust electromagnetic valves, the two urea pressure containers are connected through the electromagnetic valves, the air inlet electromagnetic valves and the air exhaust electromagnetic valves are adjusted to generate constant air pressure for pressurizing urea solutions, and the working pressure of the two urea pressure containers ranges from 0.8 MPa to 1.0 MPa. According to the urea metering spraying system, a gas pressure source is adopted to control the spraying pressure of the urea solutions, the pressure of inlets of urea nozzles is constant, and the metering accuracy and stability of the urea solution spraying amount are obviously improved.
Description
Technical field
The present invention relates to a kind of urea-spray system for diesel exhaust aftertreatment, it belongs to internal-combustion engines exhaust gas purifying system; More particularly, relate to a kind of gas pressure source that adopts and spray urea liquid as power to diesel engine exhaust system, for reducing the selective catalytic reduction SCR system of Diesel NOx discharge.
Background technique
In order to realize urea-spray, existing SCR urea-spray system adopts two kinds of spray regimes substantially: gas helps formula and non-gas to help formula.Its working principle is for adopting DC electropump to pressurize to urea liquid.In the application of road and off roader and boats and ships, all need to be powered to this motor-drive pump by storage battery, need a large amount of storage battery energy consumptions.The pneumatic-typed urea-spray system proposing is recently added to urea liquid after certain pressure as power as CN102032029A patent, CN102242658A patent, CN101975103A patent adopt gas pressure source, reaches injection metering target by controlling the solenoid valve dutycycle of urea nozzle.Although these systems are feasible from principle, have in actual applications a lot of problems, and impracticable.And to the space that is all significantly improved in cost, material requirements, Security, reliability and structural design.。
Summary of the invention
In order to solve the deficiency in the too high problem of prior art storage battery energy consumption and the design of pneumatic-typed urea-spray measuring apparatus, the invention provides a kind of structure SCR urea-spray system that adopts gas pressure source.
The technical solution adopted in the present invention is:
Be easy to a pneumatic-typed urea metering injection system of controlling, by the emitted dose that regulates the duty of urea nozzle solenoid valve recently to measure urea, comprise urea box, source of compressed air, urea emitting mechanism and controller.Arrange that two-way is connected with source of compressed air and independently coordinate alternately to bear the urea pressurized container of urea supply and ejection function and the subsystem of urea emitting mechanism formation; In each subsystem, urea pressurized container has solenoid valve to be connected with source of compressed air and is equipped with inlet and outlet solenoid valve; Two urea pressurized containers connect by solenoid valve, utilize its inlet and outlet solenoid valve to regulate to produce constant air pressure for pressurizeing to urea liquid, and the working pressure of two urea pressurized containers is 0.8～1.0MPa.
In urea pressurized container, urea box and on material pipeline, be provided with controller and be subject to level detection unit, temperature sensing and the heating performance element of its control; Gas pressure source pressure in system, the interior solution pressure of urea pressurized container, temperature and liquid level parameter feedback are to controller, and heat relay switch by controller according to the program control urea container of setting, thereby regulate the temperature of solution in urea pressurized container.
The hypomere of urea pressurized container adopts is convenient to the undergauge structure that material collects.The mounting point of urea pressurized container is higher than urea box liquid level.
Like this, system comprises that two urea pressurized containers that are connected with source of compressed air are independently coordinated and alternation, the urea pressurized container that each is connected with source of compressed air is born urea supply and ejection function, utilizes its inlet and outlet solenoid valve to regulate to produce constant air pressure for pressurizeing to urea liquid.Source of compressed air can adopt mini air compressor or compressed air reservoir, wherein normally 0.8～1.0MPa of the outlet pressure of air compressor.This scheme is applicable to different kinds of roads and off roader and boats and ships, for the commercial car that adopts air brake, can utilize original air compressor and gas holder.
Advantage of the present invention and beneficial effect are: first, control the jet pressure of urea liquid owing to having adopted gas pressure source in urea-spray system, so can make the constant pressure of urea nozzle ingress, reduce significantly the overpressure ripple that urea liquid impulse jet causes, eliminated the adverse effect of transient pressure ripple to urea nozzle emitted dose.Thereby metering accuracy and the stability of urea solution jet amount are improved significantly.
Brief description of the drawings
Fig. 1 is that the present invention adopts a kind of pneumatic-typed urea metering injection system schematic diagram that is easy to control.
1, compressed air inlet; 2, gas holder; 3, compressed air outlet; 4, air-strainer; 5, heating relay switch and urea box resistive heater; 6, urea box temperature transducer; 7, aqueous solution of urea filter; 8, aqueous solution of urea face; 9, aqueous solution of urea level sensor; 10, urea box; 11, urea nozzle; 12, urea pipe; 13, add thermorelay and urea pipe resistive heater; 14, temperature sensor signal input in urea pump; 15, urea pressurized container I pressure transducer; 16, urea pressurized container I adds thermorelay and resistive heater; 17, urea pressurized container I liquid level sensor; 18, urea pressurized container I; 19, urea pressurized container I switch electromagnetic valve; 20, urea pressurized container II switch electromagnetic valve; 21, urea pressurized container I urea liquid level; 22, urea pressurized container II urea liquid level; 23, urea pressurized container II pressure transducer; 24, urea pressurized container I liquid level sensor; 25, urea pressurized container II adds thermorelay and resistive heater; 26, urea pressurized container II air inlet electromagnetic valve; 27, urea pressurized container II pressure-releasing electromagnetic valve; 28, urea pressurized container I/II exhaust tube termination; 29, urea pressurized container I/II vacuum air pump; 30, urea pressurized container I air inlet electromagnetic valve; 31, urea pressurized container I pressure-releasing electromagnetic valve; 32, ECU (Electrical Control Unit); 33, ECU (Electrical Control Unit) sensor signal input end; 34, ECU (Electrical Control Unit) actuator signal output terminal; 35, add thermorelay; 36, urea pipe; 37, engine coolant entrance (for cooling urea nozzle); 38, engine coolant outlet (for cooling urea nozzle); 39, pressurized container I urea nozzle solenoid valve; 40, urea filler; 41, urea pump shell; 42, engine coolant entrance (for cooling urea nozzle); 43, engine coolant outlet (for cooling urea nozzle); 44, high pressure airline; 45, engine CAN bus signal input.
Fig. 2 is that two urea nozzle of the present invention are arranged schematic diagram on SCR after-treatment device.
Fig. 3 is Fig. 2 A – B cross-sectional view.
The schematic diagram of Fig. 4 position another embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The present invention is a kind of urea-spray system that adopts gas pressure source, and wherein gas pressure source can be a kind of high-pressure gas cylinder, or air compressor and gas holder, and two kinds of its working principles of mode are similar.Now be embodied as example with air compressor and gas holder.
As shown in Figure 1, 2, inflated to gas holder 2 by the compressed air inlet of mini air compressor.As vehicle gas pressure source, working pressure is generally 0.8～1.0MPa.18 is urea pressurized container I, and the urea pressurized container I/II volume that the present embodiment is selected is respectively 1L.Urea pressurized container I/II air inlet electromagnetic valve 30/26 is in closed condition, urea pressurized container I/II pressure-releasing electromagnetic valve 31/27 is in open mode, urea pressurized container I/II switch electromagnetic valve 19/20 is opened, the part air that the air vacuum pump 29 of installing in urea pressurized container I/II is taken away in pressurized container I/II forms certain degree of vacuum, urea in urea box 10 is pumped in urea pressurized container I/II under the effect of pressure reduction, when detecting urea liquid, urea pressurized container I/II liquid level sensor 15/23 rises to after certain height, at this moment close the solenoid valve 31/27 of urea pressurized container I/II, urea pressurized container I/II switch electromagnetic valve 19/20.Open the air inlet electromagnetic valve 30 of urea pressurized container I simultaneously.Urea pressurized container I connects with urea nozzle 39 by urea pipe 36.Air pressure in urea pressurized container I is adjusted to constant pressure by the air inlet electromagnetic valve 30 of urea pressurized container I with pressure-releasing electromagnetic valve 31.Make like this pressure of urea in pressurized container I remain constant pressure, set up constant pressurized container I internal pressure.By the emitted dose that regulates the duty of urea nozzle solenoid valve recently to measure urea.Pressurized container I bears required urea supply function and urea-spray function of measuring.All valves and air vacuum pump are regulated by ECU (Electrical Control Unit) 32.After the urea in pressurized container I is used up, be switched to pressurized container II, suction valve 26 by pressurized container II is adjusted to constant air pressure with bleed valve 27, make like this urea liquid pressure in pressurized container II remain the constant pressure that same high-pressure air is identical, set up constant pressurized container internal pressure, by the emitted dose that regulates the duty of urea nozzle solenoid valve recently to measure urea, the valve that pressurized container II is all and air vacuum switch pump are regulated by urea measurement control unit.In the time that working pressure container II works, pressurized container I can work alone urea is extracted in pressurized container from urea box, and sets up constant working pressure.Pressurized container I and II are used alternatingly like this.
On urea pressurized container I and urea pressurized container II, electrical heating wire 16,26 is all housed, its inner mounting temperature sensor 26 and liquid level sensor 17,24, pressure transducer 15,23, relevant urea pipeline heating wire, is controlled by ECU (Electrical Control Unit) 32.
Urea cooling unit is used for cooling urea nozzle 39 by coolant inlet tube 37, coolant outlet pipe 38, prevents that urea nozzle 39 from crossing cause thermal damage.Urea cooling unit is used for cooling urea nozzle 11 by coolant inlet tube 42, coolant outlet pipe 43, prevents that urea nozzle 11 from crossing cause thermal damage.Liquid level sensor 9 is installed in urea tank 10, measures the liquid level of urea liquid; Temperature transducer 6 is also housed in urea tank, measures the temperature of urea liquid and feed back to ECU (Electrical Control Unit) 32; Adopt the urea in heating relay switch and urea box resistive heater 5 (or engine coolant) heating urea case.In Fig. 2 and Fig. 3, provide the fitting arrangement of two urea nozzle that work alone.
To some specific demands, also can adopt a set of pressurized container shown in Fig. 4 and urea-spray system to carry out work, its principle is similar with two urea pumps.
In the present invention, the control gear of urea-spray system and controlling method belong to prior art, therefore no longer describe in detail in this manual.
Claims (4)
1. one kind is easy to the pneumatic-typed urea metering injection system of controlling, by the emitted dose that regulates the duty of urea nozzle solenoid valve recently to measure urea, comprise urea box, source of compressed air, urea emitting mechanism and controller, it is characterized in that, arrange that two-way is connected with source of compressed air and independently coordinate alternately to bear the urea pressurized container of urea supply and ejection function and the subsystem of urea emitting mechanism formation; In each subsystem, urea pressurized container has solenoid valve to be connected with source of compressed air and is equipped with inlet and outlet solenoid valve; Two urea pressurized containers connect by solenoid valve, utilize its inlet and outlet solenoid valve to regulate to produce constant air pressure for pressurizeing to urea liquid, and the working pressure of two urea pressurized containers is 0.8～1.0MPa.
2. be easy to according to claim 1 the pneumatic-typed urea metering injection system of controlling, it is characterized in that, in urea pressurized container, urea box and on material pipeline, be provided with controller and be subject to level detection unit, temperature sensing and the heating performance element of its control; Gas pressure source pressure in system, the interior solution pressure of urea pressurized container, temperature and liquid level parameter feedback are to controller, and heat relay switch by controller according to the program control urea container of setting, thereby regulate the temperature of solution in urea pressurized container.
3. be easy to according to claim 1 the pneumatic-typed urea metering injection system of controlling, it is characterized in that, the hypomere of described urea pressurized container adopts is convenient to the undergauge structure that material collects.
4. be easy to according to claim 1 the pneumatic-typed urea metering injection system of controlling, it is characterized in that, the mounting point of described urea pressurized container is higher than urea box liquid level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410211342.8A CN103993936A (en) | 2014-05-19 | 2014-05-19 | Air pressure type urea metering spraying system easy to control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410211342.8A CN103993936A (en) | 2014-05-19 | 2014-05-19 | Air pressure type urea metering spraying system easy to control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612793A (en) * | 2015-01-20 | 2015-05-13 | 西南交通大学 | Air pressure type urea metering spraying system easy to control |
| CN111065808A (en) * | 2017-08-29 | 2020-04-24 | 维特思科科技有限责任公司 | Method and device for determining the injection quantity or injection rate of a fluid injected into a reaction space by means of an injector |
| CN112771257A (en) * | 2018-09-26 | 2021-05-07 | 宝马股份公司 | Operating medium supply device with air separator, motor vehicle and method for operating an operating medium supply device |
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| CN101076657A (en) * | 2004-11-05 | 2007-11-21 | 日产柴油机车工业株式会社 | Exhaust gas purification apparatus |
| DE102006053556A1 (en) * | 2006-11-14 | 2008-05-15 | Purem Abgassysteme Gmbh & Co. Kg | Device for dosing reducing agent and injector in a device for dosing reducing agent |
| US20080260597A1 (en) * | 2007-04-23 | 2008-10-23 | Denso Corporation | Reducing gas generator and solid reductant SCR system having the generator |
| CN101806238A (en) * | 2010-03-13 | 2010-08-18 | 中国第一汽车集团公司 | Air-assisted atomized urea reducing agent spraying controlling system of pump power |
| CN103256103A (en) * | 2012-08-22 | 2013-08-21 | 南京科益环保科技有限公司 | Dual-pump pneumatic urea metered system |
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2014
- 2014-05-19 CN CN201410211342.8A patent/CN103993936A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101076657A (en) * | 2004-11-05 | 2007-11-21 | 日产柴油机车工业株式会社 | Exhaust gas purification apparatus |
| DE102006053556A1 (en) * | 2006-11-14 | 2008-05-15 | Purem Abgassysteme Gmbh & Co. Kg | Device for dosing reducing agent and injector in a device for dosing reducing agent |
| US20080260597A1 (en) * | 2007-04-23 | 2008-10-23 | Denso Corporation | Reducing gas generator and solid reductant SCR system having the generator |
| CN101806238A (en) * | 2010-03-13 | 2010-08-18 | 中国第一汽车集团公司 | Air-assisted atomized urea reducing agent spraying controlling system of pump power |
| CN103256103A (en) * | 2012-08-22 | 2013-08-21 | 南京科益环保科技有限公司 | Dual-pump pneumatic urea metered system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612793A (en) * | 2015-01-20 | 2015-05-13 | 西南交通大学 | Air pressure type urea metering spraying system easy to control |
| CN111065808A (en) * | 2017-08-29 | 2020-04-24 | 维特思科科技有限责任公司 | Method and device for determining the injection quantity or injection rate of a fluid injected into a reaction space by means of an injector |
| CN111065808B (en) * | 2017-08-29 | 2022-06-21 | 维特思科科技有限责任公司 | Method and device for determining the injection quantity or injection rate of a fluid injected into a reaction space by means of an injector |
| CN112771257A (en) * | 2018-09-26 | 2021-05-07 | 宝马股份公司 | Operating medium supply device with air separator, motor vehicle and method for operating an operating medium supply device |
| US11339700B2 (en) | 2018-09-26 | 2022-05-24 | Bayerische Motoren Werke Aktiengesellschaft | Operating material supply system having an air separator, motor vehicle, and method for operating an operating material supply system |
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Application publication date: 20140820 |