CN104612793A - 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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- CN104612793A CN104612793A CN201510026579.3A CN201510026579A CN104612793A CN 104612793 A CN104612793 A CN 104612793A CN 201510026579 A CN201510026579 A CN 201510026579A CN 104612793 A CN104612793 A CN 104612793A
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Abstract
The invention discloses an air pressure type urea metering spraying system easy to control. The system comprises a urea box, a compressed air source, a pneumatic vacuum pump, a urea spraying mechanism and an electric control unit. Two paths of sub-systems composed of urea spraying containers and the urea spraying mechanism are arranged. In the sub-systems, the parts are connected through solenoid valves, and the two paths of sub-systems are connected through a three-way joint and the solenoid valves. The coordination control of the solenoid valves is utilized to generate constant air pressure for pressurizing urea solutions, the pneumatic vacuum pump has an entrainment effect through jet flow of compressed air, and a certain vacuum degree is formed in the urea spraying containers to supply urea. The electric control units control the specific actions of the solenoid valves, so that the main urea spraying container and the auxiliary urea spraying container independently, jointly and coordinately have the urea supplying and spraying functions in an alternating mode. The spraying pressure of the urea solutions is controlled by a gas pressure source, so that the pressure at the position of a urea nozzle inlet is constant, and the metering accuracy and stability of the spraying amount of the urea solutions are remarkably improved.
Description
Technical field
The present invention relates to a kind of urea metering injection system for diesel exhaust aftertreatment, it belongs to diesel engine vent gas cleaning system; More particularly, relate to a kind of gas pressure source that adopts and spray urea liquid as power to diesel exhaust aftertreatment system meters, for reducing the selective catalytic reduction SCR system of Diesel NOx discharge.
Background technique
In order to realize urea-spray, existing SCR urea injection system adopts two kinds of spray regimes substantially: gas helps formula and non-gas to help formula.Non-gas helps the working principle of formula urea injection system to pressurize to urea liquid for adopting DC electropump, all needs to be powered to this motor-drive pump by storage battery, need the storage battery electric energy that consumption is a large amount of in the application of road and off roader and boats and ships.Gas helps formula urea injection system to adopt gas pressure source to be urea liquid pressurization as power, pneumatic-typed urea injection system disclosed in patent CN102032029A, CN102242658A, CN101975103A, urea-spray pressure transient, urea injecting quantity metering is inaccurate.Although these two kinds of systems are feasible from principle, there is a lot of problem in actual applications, as urea injecting quantity error in dipping is comparatively large, higher to the requirement of material, complex structure, cost are higher, and in urea pump, also there is the hidden danger of urea crystals.
Summary of the invention
In order to solve existing non-gas help the too high problem of formula urea injection system storage battery energy consumption and gas help formula urea injection system design in deficiency, the invention provides a kind of new urea metering injection system adopting gas pressure source, this system architecture is simple, small and exquisite, amount of parts is few, energy consumption is low, with low cost; During practical application, the metering accuracy of urea injecting quantity and the stability of a system, reliability, response characteristic are all better, are particularly useful for the medium and heavy-duty engines exhaust aftertreatment field meeting state four and more maximum discharge regulation.If utilize air pressure type braking energy reclaiming system as auxiliary source of the gas, then the effects of energy saving and emission reduction of this system will be more remarkable.
The present invention solves its technical problem, and the technological scheme adopted is:
A kind of pneumatic-typed urea metering injection system being easy to control, by the emitted dose regulating the dutycycle of urea nozzle solenoid valve to measure urea liquid, comprise urea box, source of compressed air, pneumatic type vacuum pump, urea-spray mechanism and ECU (Electrical Control Unit) and connecting pipeline and respective valve system, it is characterized in that, two cover urea supply and ejecting systems, i.e. urea supply and spray main system and urea supply and spray auxiliary system, parallel be arranged on be made up of source of compressed air and pneumatic type vacuum pump between gas source inlet and urea box;
In described two urea supplies and ejecting system, all have following structure: be connected with urea-spray container, the top of urea-spray container is connected with gas source inlet gas circuit by respective valve system, is connected bottom it by respective valve system with urea box fluid path; Urea-spray pipeline is connected with urea-spray container fluid path; Resistant heating device, liquid level and temperature sensing mechanism is provided with in each urea-spray container;
Source of compressed air and pneumatic type vacuum pump are walked abreast by pipeline and respective valve system and communicate with two urea supplies and ejecting system gas circuit; The entrance of pneumatic type vacuum pump is connected with source of compressed air, and relief opening communicates with air, and the vacuum port of pneumatic type vacuum pump communicates with two urea-spray upper vessel portion gas circuits; The Involving velocity of pneumatic type vacuum pump provides feed power, and source of compressed air pressurization provides injection power; ECU (Electrical Control Unit) pilot line and the compressed-air actuated mutual switching not between same-action of respective valve system cooperation control make source of compressed air and pneumatic type vacuum pump stagger the time work;
Described ECU (Electrical Control Unit) accepts to comprise the sensor signal in engine CAN bus, two urea supplies and ejecting system and urea box, in urea pump, exports actuating signal and the system failure monitoring and diagnosis output signal of heating performance element signal and each solenoid valve comprised in urea-spray container; ECU (Electrical Control Unit) controls each performance element according to built-in control algorithm, thus the supply of cooperation control urea, injection, backflow, and control the temperature of urea liquid.
Like this, be connected by tee union, solenoid valve between two-way subsystem; Utilize each solenoid valve cooperation control to produce constant air pressure for pressurizeing to urea liquid, the working pressure of two urea-spray containers is 0.8 ~ 1.0MPa; Pneumatic type vacuum pump is using source of compressed air as power source, and utilize compressed-air actuated jet to produce Involving velocity, in urea-spray container, set up certain degree of vacuum, its working pressure is 0.4 ~ 0.5MPa; ECU (Electrical Control Unit) controls the specific action of each solenoid valve, realize the function that urea main injection container and secondary injection container are independent, common, coordinate alternately to bear urea supply and injection, and the residual urine cellulose solution in urea-spray container and urea-spray pipeline is recycled in urea box.
The input signal of ECU (Electrical Control Unit) comprises each sensor signal in engine CAN bus signal and urea main injection container, secondary injection container, urea box, in urea pump and each sensor signal of catalytic reactor, and output signal comprises the heating performance element signal in urea-spray container, each solenoid valve actuating signal and system failure monitoring and diagnosis output signal; ECU (Electrical Control Unit) controls each performance element according to built-in control algorithm, thus the temperature of cooperation control urea supply, injection, backflow and urea liquid.
The hypomere of urea main injection container and secondary injection container adopts the round and smooth undergauge structure be convenient to material and collected, and the volume ratio secondary injection container of urea main injection container is little, thus realizes quick supply, the injection of urea liquid and reflux.
Urea main injection container is connected by solenoid valve with secondary injection container, by the action of Controlling solenoid valve to realize urea secondary injection container for functions such as urea main injection container feed and both collaborative injections.
Pneumatic type vacuum pump provides power by source of compressed air, by electromagnetic valve, utilizes compressed-air actuated jet to produce Involving velocity, set up certain degree of vacuum, realize supply and the backflow of urea in urea-spray container.
Like this, the two-way subsystem be made up of urea-spray container and urea-spray mechanism in system is independent, common, coordination alternation, the urea-spray container be connected with source of compressed air, pneumatic type vacuum pump in each road subsystem is all independent, shared urea supply and ejection function, between two-way subsystem by the action of Controlling solenoid valve to realize urea secondary injection container for functions such as urea main injection container feed and both collaborative injections.Source of compressed air can adopt vehicle-mounted mini air compressor, compressed air reservoir or air pressure type braking energy reclaiming system, for the commercial car adopting air damping, can utilize original air compressor and gas holder.Utilize the urea liquid in engine coolant heating urea pump, when motor just starts, coolant temperature is lower, and urea-spray container can adopt resistive heater auxiliary heating.This scheme is applicable to different kinds of roads and off roader and boats and ships, is particularly useful for the medium and heavy-duty engines market meeting state four and more maximum discharge regulation.
Working principle of the present invention and process are: by the emitted dose regulating the dutycycle of urea nozzle solenoid valve to measure urea liquid, and source of compressed air is the urea liquid pressurization in urea-spray container, sprays power for urea-spray mechanism provides, vacuumizes power for pneumatic type vacuum pump provides.When urea main injection container work, pneumatic type vacuum pump first works, the solenoid valves action be connected with urea main injection container, urea main injection container and pneumatic type vacuum pump, urea box is communicated with, under the effect of pressure reduction, urea liquid in urea box enters urea main injection container, simultaneously, the solenoid valves action be connected with urea secondary injection container, urea secondary injection container and pneumatic type vacuum pump, urea box is communicated with, urea liquid in urea box enters urea secondary injection container simultaneously, after two urea-spray container feed complete, solenoid valve power-off, pneumatic type vacuum pump is shut down, the solenoid valves be connected with urea main injection container commutates, urea main injection container is communicated with source of compressed air, source of compressed air is the pressurization of urea main injection container, during urea main nozzle solenoid valves, urea main injection container starts to spray urea, urea amount is larger needed for the system, when the emitted dose of urea main injection container cannot meet system requirements, the solenoid valves be connected with urea secondary injection container commutates, source of compressed air is the pressurization of urea secondary injection container, urea pilot jet solenoid valves, urea main injection container and urea secondary injection container spray urea simultaneously, when urea in urea main injection container is not enough, by the specific action of solenoid valve, urea secondary injection container starts to spray, meanwhile, urea box is urea main injection container feed, after feed completes, urea main injection container sprays, and urea secondary injection container enters state undetermined, when a certain road subsystem break down cannot spray time, another road subsystem enters working state, completes supply and the injection of urea.After urea-spray terminates; pneumatic type vacuum pump utilizes the Involving velocity of jet; urea in pipeline between urea-spray container and urea nozzle is drawn back in urea-spray container again; after pneumatic type vacuum pump is shut down; by the action of solenoid valve; urea-spray container is communicated with source of compressed air, urea box, and the residual urine cellulose solution in urea-spray container pushes back in urea box by source of compressed air.
Compared with prior art, advantage of the present invention and beneficial effect are: first, owing to have employed gas pressure source in urea injection system to control the jet pressure of urea liquid, so the constant pressure of urea nozzle ingress can be made, significantly decrease the overpressure ripple that urea liquid impulse jet causes, eliminate the adverse effect of transient pressure ripple to urea nozzle emitted dose, thus considerably improve metering accuracy and the stability of urea solution jet amount; The second, adopt two-way subsystem to work in coordination with the function bearing urea supply and injection, when a certain road subsystem breaks down, another road subsystem enters working state, has continued supply and the injection of urea, has improve the reliability of system; 3rd, adopt gas pressure source as urea supply and injection power, utilize engine coolant heating urea, energy saving of system Be very effective.
Accompanying drawing explanation
Fig. 1 is a kind of pneumatic-typed urea metering injection system schematic diagram being easy to control that the present invention adopts, and comprising: 1, compressed air inlet; 2, gas holder; 3, compressed air outlet; 4, air-strainer; 5, the outer drain port of pressure maintaining valve communicates with air; 6, high pressure airline; 7, pressure maintaining valve (pressure regulator valve/pressure-limit valve); 8, tee union; 9, second depressurized valve; 10, regulated air pipeline; 11, tee union; 12, pneumatic type vacuum pump air source inlet; 13, pneumatic type vacuum pump discharges outlet; 14, solenoid valve; 15, urea pump; 16, temperature transducer in urea pump; 17, pneumatic type vacuum pump; 18, pneumatic type vacuum pump vacuum port; 19, tee union; 20, solenoid valve; 21 solenoid valves, 22 tee unions; 23 urea main injection containers; 24, urea main injection container pressure sensor; 25, urea main injection container auxiliary heating relay and resistance wire; 26, urea main injection container liquid level sensor; 27, urea liquid in urea main injection container; 28, urea main injection pipeline; 29, urea secondary injection pipeline; 30, engine coolant entrance (for heating urea solution); 31, engine coolant outlet (for heating urea solution); 32, urea pilot jet; 33, urea main nozzle; 34, engine coolant outlet (for cooling urea main nozzle); 35, engine coolant entrance (for cooling urea main nozzle); 36, engine coolant outlet (for cooling urea pilot jet); 37, engine coolant entrance (for cooling urea pilot jet); 38, urea box; 39, urea liquid in urea box; 40, liquid level sensor of urea box; 41, urea solution filter; 42, urea box temperature transducer; 43, urea box adds thermorelay and resistive heater; 44, urea filler and breather plug; 45, bidirectional electromagnetic valve; 46, tee union; 47, bidirectional electromagnetic valve; 48, ECU (Electrical Control Unit); 49, engine CAN bus signaling interface; 50, ECU (Electrical Control Unit) sensor signal interface; 51, ECU (Electrical Control Unit) actuator signal interface; 52, urea liquid in urea secondary injection container; 53, urea secondary injection container liquid level sensor; 54, urea secondary injection container auxiliary heating relay and resistance wire; 55, urea secondary injection container pressure sensor; 56, urea secondary injection container; 57, three-way interface; 58, solenoid valve; 59, solenoid valve; 60, engine exhaust pipe.
Fig. 2 is urea main nozzle in the present invention and the layout schematic diagram of pilot jet on engine exhaust pipe.
Embodiment
The present invention is a kind of pneumatic-typed urea metering injection system being easy to control, and wherein gas pressure source can be vehicle-mounted mini air compressor, compressed air reservoir or air pressure type braking energy reclaiming system, and the working principle of various mode is similar.Be now the embodiment of gas pressure source with gas holder, the present invention is described in further detail with concrete mode of execution by reference to the accompanying drawings.
As shown in Figure 1, inflated to gas holder 2 by mini air compressor or the compressed air inlet 1 of air pressure type braking energy reclaiming system, high-pressure air in gas holder 2 filters through air-strainer 4, pressure maintaining valve (pressure regulator valve/pressure-limit valve) 7 voltage stabilizings, second depressurized valve 9 reduce pressure, for urea pump 15 provides gas pressure source, as supply and the injection power of urea.23,56 be respectively urea main injection container and urea secondary injection container, the volume of the urea main injection container 23 that the present embodiment is selected and urea secondary injection container 56 is 400mL, 600mL respectively.Urea pump 15 inside is provided with temperature transducer 16 and ECU (Electrical Control Unit) 48, and urea main injection container 23 and urea secondary injection container 56 are all equipped with auxiliary heating resistance wire 25,54, and liquid level sensor 26,53 is equipped with in its inside, pressure transducer 24,55.Urea pump 15 is built with Urea performance element, when urea pump 15 built-in temperature sensor 16 detects that in urea pump 15, temperature is lower, utilize engine coolant heating urea, cooling liquid flows into heating unit by engine coolant entrance 30, exports 31 flow out heating unit by engine coolant; When motor just starts, coolant temperature is lower, utilizes auxiliary heating resistance wire 25,54 pairs of urea liquids to carry out auxiliary heating.Utilize engine coolant to cool urea main nozzle 33 and urea pilot jet 32, prevent urea nozzle 33,32 from crossing cause thermal damage, cooling liquid, by engine coolant entrance 35,37 flow nozzle, exports 34,36 mass flowing nozzles by engine coolant.All solenoid valves, heating performance element control by ECU (Electrical Control Unit) 48.
When urea pump 15 is started working, solenoid valve 14, 21, 45, 47, 59 energisings, pressurized air enters pneumatic type vacuum pump 17 by pneumatic type vacuum pump air source inlet 12, jet is formed in pneumatic type vacuum pump 17 exhaust ports, produce Involving velocity, and then the partial air taken away in urea main injection container 23 and urea secondary injection container 56 forms certain degree of vacuum, urea liquid 39 in urea box 38 is pumped in urea main injection container 23 and urea secondary injection container 56 under the effect of pressure reduction, urea-spray container starts feed, liquid level sensor 26 in urea main injection container 23 and urea secondary injection container 56, 53 detect urea liquid 27, 52 rise to certain height after, urea-spray container feed completes, at this moment solenoid valve 14, 21, 45, 47, 59 power-off.The energising of solenoid valve 20, urea main injection container 23 is communicated with urea main nozzle 33 by urea main injection pipeline 28, be communicated with gas holder 2 by tee union 11, air pipe line, gas holder 2 starts as the urea liquid 27 in urea main injection container 23 pressurizes, air pressure in urea main injection container 23 is adjusted to constant pressure by solenoid valve 20, make the pressure of urea liquid 27 in urea main injection container 23 remain constant pressure like this, in urea main injection container 23, set up constant internal pressure.When the solenoid valves of urea main nozzle 33, urea main nozzle 33 starts to spray urea liquid, is measured the emitted dose of urea by the dutycycle of the solenoid valve regulating urea main nozzle 33.Urea main injection container 23, solenoid valve 20, urea main nozzle 33 bear main urea supply function and urea metering ejection function.
When urea main injection container 23 cannot meet urea-spray demand, while main urea nozzle 33 sprays urea, solenoid valve 58, pilot jet 32 are energized, and auxiliary urea nozzle 32 and main urea nozzle 33 spray urea, to meet the more urea requirement amount of system simultaneously.If solenoid valve 20,47,58 is energized, solenoid valve 14,21,45,59 power-off, urea secondary injection container 56 is urea main injection container 23 feed; If solenoid valve 47,58 is energized, solenoid valve 14,20,21,45,59 power-off, the urea liquid 52 in urea secondary injection container 56 will be sprayed by urea main injection container 23, urea main nozzle 33.
When the urea liquid 27 in urea main injection container 23 is about to use up, urea secondary injection container 56 starts secondary injection, and solenoid valve 58 is energized.The pressure of urea liquid 52 in urea secondary injection container 56 is regulated to remain the constant pressure identical with pressurized air by solenoid valve 58, constant internal pressure is set up in urea secondary injection container 56, during the solenoid valves of urea pilot jet 32, urea pilot jet 32 starts secondary injection urea liquid, is measured the emitted dose of urea by the dutycycle of the solenoid valve regulating urea pilot jet 32.While the secondary injection of urea secondary injection container 56, the solenoid valve power-off of solenoid valve 20, main nozzle 33, solenoid valve 14,21,45 is energized, pneumatic type vacuum pump 17 utilizes compressed-air actuated jet to produce Involving velocity, be extracted into by urea liquid 39 in urea box 38 in urea main injection container 23, urea main injection container 23 starts feed; After urea main injection container 23 feed completes, solenoid valve 14,21,45 power-off, solenoid valve 20 is energized, constant working pressure set up by urea main injection container 23, meanwhile, solenoid valve 58, the power-off of urea pilot jet solenoid valve 32, system switches to main urea nozzle 33 to spray again.Such urea main injection container 23 and urea secondary injection container 56 alternative supply and injection.
After urea-spray terminates, solenoid valve 14,21,59 and main urea nozzle solenoid valve 33, auxiliary urea nozzle solenoid valve 32 are energized, all the other solenoid valve power-off, pneumatic type vacuum pump 17 works, and draws back the residual urine cellulose solution in urea main injection pipeline 28, urea secondary injection pipeline 29 in urea main injection container 23 and urea secondary injection container 56.Afterwards; solenoid valve 14,21,59 and main urea nozzle solenoid valve 33, auxiliary urea nozzle solenoid valve 32 power-off; pneumatic type vacuum pump 17 is shut down; solenoid valve 20,45,47,58 is energized, and remaining urea liquid in urea main injection container 23 and urea secondary injection container 56 pushes back in urea box 38 by pressurized air.
Urea box 38 is provided with liquid level sensor 40, measures the liquid level of urea liquid 39 in urea box 36; Urea box 38 is also equipped with temperature transducer 42, measures the temperature of urea liquid 39; Adopt the urea liquid 39 in heating relay switch and resistive heater 43 (or engine coolant) heating urea case 38; Utilize the urea liquid 39 in urea solution filter 41 filter urea case 38; By urea filler and breather plug 44, add urea for urea box 38 and keep urea box 38 internal air pressure balance, air cleaner.
As shown in Figure 2, urea main nozzle 33, urea pilot jet 32 is angled is arranged on engine exhaust pipe 60.
Claims (4)
1. one kind is easy to the pneumatic-typed urea metering injection system of control, by the emitted dose regulating the dutycycle of urea nozzle solenoid valve to measure urea liquid, comprise urea box, source of compressed air, pneumatic type vacuum pump, urea-spray mechanism and ECU (Electrical Control Unit) and connecting pipeline and respective valve system, it is characterized in that, two cover urea supply and ejecting systems, i.e. urea supply and spray main system and urea supply and spray auxiliary system, parallel be arranged on be made up of source of compressed air and pneumatic type vacuum pump between gas source inlet and urea box;
In described two urea supplies and ejecting system, all have following structure: be connected with urea-spray container, the top of urea-spray container is connected with gas source inlet gas circuit by respective valve system, is connected bottom it by respective valve system with urea box fluid path; Urea-spray pipeline is connected with urea-spray container fluid path; Resistant heating device, liquid level and temperature sensing mechanism is provided with in each urea-spray container;
Source of compressed air and pneumatic type vacuum pump are walked abreast by pipeline and respective valve system and communicate with two urea supplies and ejecting system gas circuit; The entrance of pneumatic type vacuum pump is connected with source of compressed air, and relief opening communicates with air, and the vacuum port of pneumatic type vacuum pump communicates with two urea-spray upper vessel portion gas circuits; The Involving velocity of pneumatic type vacuum pump provides feed power, and source of compressed air pressurization provides injection power; ECU (Electrical Control Unit) pilot line and the compressed-air actuated mutual switching not between same-action of respective valve system cooperation control make source of compressed air and pneumatic type vacuum pump stagger the time work;
Described ECU (Electrical Control Unit) accepts to comprise the sensor signal in engine CAN bus, two urea supplies and ejecting system and urea box, in urea pump, exports actuating signal and the system failure monitoring and diagnosis output signal of heating performance element signal and each solenoid valve comprised in urea-spray container; ECU (Electrical Control Unit) controls each performance element according to built-in control algorithm, thus the supply of cooperation control urea, injection, backflow, and control the temperature of urea liquid.
2. be easy to the pneumatic-typed urea metering injection system controlled according to claim 1, it is characterized in that, in described two urea supplies and ejecting system, urea main injection container is connected by solenoid valve with secondary injection container, by controlling the action of this solenoid valve to realize urea secondary injection container for urea main injection supply for receptacles and collaborative ejection function.
3. be easy to the pneumatic-typed urea metering injection system controlled according to claim 1, it is characterized in that, the hypomere of described urea-spray container adopts the round and smooth undergauge structure be convenient to material and collected, and the volume ratio secondary injection container of urea main injection container is little, thus realizes quick supply, the injection of urea liquid and reflux.
4. be easy to the pneumatic-typed urea metering injection system controlled according to claim 1, it is characterized in that, described two urea-spray containers vertically install and the top of two containers flushes, and the mounting point of two containers is all higher than liquid level in urea box.
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| CN105986860A (en) * | 2015-01-30 | 2016-10-05 | 天纳克（苏州）排放系统有限公司 | Metering pump nozzle and engine exhaust post-treatment system with same |
| CN108361095A (en) * | 2018-03-26 | 2018-08-03 | 浙江爱力浦科技股份有限公司 | A kind of automatic control type urea liquid spraying system |
| CN110318850A (en) * | 2019-06-05 | 2019-10-11 | 广州文冲船厂有限责任公司 | A kind of urea cycle system in SCR system |
| 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 |
| CN113669145A (en) * | 2021-09-30 | 2021-11-19 | 中国重汽集团济南动力有限公司 | Air-assisted SCR urea dual-injection fault diagnosis system and method |
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| CN113669145B (en) * | 2021-09-30 | 2023-01-03 | 中国重汽集团济南动力有限公司 | Air-assisted SCR urea dual-injection fault diagnosis system and method |
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Application publication date: 20150513 |