CN108005762B - A kind of SCR system of electric engineering car - Google Patents
A kind of SCR system of electric engineering car Download PDFInfo
- Publication number
- CN108005762B CN108005762B CN201711141944.0A CN201711141944A CN108005762B CN 108005762 B CN108005762 B CN 108005762B CN 201711141944 A CN201711141944 A CN 201711141944A CN 108005762 B CN108005762 B CN 108005762B
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- Prior art keywords
- urea water
- water injection
- pipe
- injection device
- bleed
- Prior art date
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- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000002347 injection Methods 0.000 claims abstract description 75
- 239000007924 injection Substances 0.000 claims abstract description 75
- 239000003054 catalyst Substances 0.000 claims abstract description 36
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004202 carbamide Substances 0.000 claims abstract description 17
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000011017 operating method Methods 0.000 claims description 3
- 230000000306 recurrent effect Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
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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]
-
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/10—Carbon or carbon oxides
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
-
- 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
- F01N2610/148—Arrangement of sensors
-
- 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
-
- 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
-
- 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
Abstract
A kind of SCR system of electric engineering car, including engine, exhaust pipe and the SCR catalyst positioned at tailpipe downstream have urea water injection device in the upstream of exhaust pipe, the front-end configuration of SCR catalyst；Further include electronic control unit ECU, is configured with gas outlet on exhaust pipe, it further includes air entraining pipe which, which is located at the upstream of urea water injection device, and one end of air entraining pipe is inserted into gas outlet, and the other end leads to the casing lower end of urea water injection device；It further include bleed general pipeline, one end of bleed general pipeline is connected to the casing upper end of urea water injection device, the other end is connected to air pump, and the gas outlet of air pump is connected to by jet general pipeline at least one jet pipe, and each jet pipe is all disposed within the upstream in the downstream of urea water injection device, SCR catalyst.The present invention heats urea water injection valve using exhaust, and system structure is simple, and operation is simple, while can mix by spraying to urea, is conducive to the catalytic efficiency for improving SCR.
Description
Technical field
The present invention relates to a kind of SCR systems, more particularly, to a kind of SCR system for electric engineering car.
Background technique
Electric engineering car is speedily carried out rescue work commonly used in electric power, electric power installation, maintenance field, big with horsepower, big excellent of load-carrying
Point.Electric engineering car is usually diesel vehicle, and also having part is high-power gasoline car.Though using which type of vehicle, electric power
Engineering truck requires powerful output, and to exhaust system, more stringent requirements are proposed for this.
In order to adapt to emission regulation, oversize vehicle usually requires that installation SCR system (i.e. TWC Three Way Catalyst System), arranges with misorientation
Urea water is sprayed in gas to be reacted with the SCR catalyst in downstream, and NOx therein, the pernicious gases such as CO are eliminated.Urea water injection
Device is easy blocking, and the mode for generalling use electric heating or cooling water heating in the prior art carries out deicing to it, however these
Mode system complex, control is insensitive, and cost is more expensive.
Need a kind of more easy injector deicing system.
Summary of the invention
In order to solve the problems in the existing technology, present invention thus provides a kind of SCR system of electric engineering car,
Including engine, exhaust pipe and positioned at the SCR catalyst of tailpipe downstream, before the upstream of the exhaust pipe, SCR catalyst
End is configured with urea water injection device, and the urea water injection device configuration is extend into inside it on the exhaust pipe；The urine
Plain water ejector is connected to urea tank, and there is urea water recurrent canal to be used to remaining urea water returning to the urea tank；Also
It is used to control the operation of SCR system including electronic control unit ECU, is configured with gas outlet on the exhaust pipe, which is located at institute
The upstream for stating urea water injection device further includes air entraining pipe, and one end of the air entraining pipe is inserted into the gas outlet, and the other end is logical
To the casing lower end of the urea water injection device；It further include bleed general pipeline, one end of the bleed general pipeline and the urea
The casing upper end of water ejector is connected to, and the other end is connected to air pump, and the gas outlet of the air pump is by jet general pipeline and extremely
Few jet pipe connection, one end of each jet pipe are connected to jet general pipeline, and the other end is inserted into inside SCR catalyst, each spray
Pipe is all disposed within the upstream in the downstream of the urea water injection device, SCR catalyst.
Further, the casing surrounds urea water injection device upper end, interior to have spiralling fin,
The air entraining pipe enters from the lower end of the casing, heats by fin guiding rear screw rising to urea water injection device,
Finally it is discharged from the shell set upper side for being located at urea water injection device by bleed general pipeline.
Further, bleed pipe valve is provided on the air entraining pipe.
Further, in the upstream of the bleed pipe valve, bleed branch pipe, the bleed are also configured on the air entraining pipe
Bleed general pipeline is communicates directly to by the urea water injection device by branch pipe.
Further, the bleed branch pipe is provided with manifold valve.
It further, further include electronic control unit ECU, the bleed pipe valve and bleed manifold valve are all connected on ECU, described
Temperature sensor is also configured on urea water injection device, the temperature sensor is connect with ECU, is sprayed for the monitoring urea water
The temperature of emitter；The air pump further includes flow sensor, which is connected to ECU.
Further, the jet general pipeline is arranged around the shell of SCR catalyst；The jet pipe is in the outer of SCR catalyst
It is radially distributed on week, and position in the axial direction is identical, and a portion of multiple jet pipes is horizontally disposed, multiple jet pipes
It is arranged on another part vertical direction, and the spout of the jet pipe of any two relative configuration mutually staggers certain distance.
Further, multiple jet pipes are radially distributed on the periphery of SCR catalyst, and position phase in the axial direction
Together, the normal of each jet pipe and the circumference normal of SCR catalyst are at an angle of a configuration.
In addition, including the following steps: the present invention also provides a kind of operating method of the SCR system of electric engineering car
Step 1, ECU receives the signal of engine, and control urea water injection device sprays urea water to exhaust；
Step 2, the signal of ECU real-time reception temperature sensor, judges whether the received temperature value of institute is lower than the first value, such as
Fruit is that then ECU7 sends open signal to transmission bleed pipe valve open signal, while to air pump；
Step 3, the signal of ECU7 real-time reception temperature sensing judges whether position is higher than second value to the received temperature value of institute,
If it is, adjusting the aperture for reducing bleed pipe valve and/or reducing the revolving speed for adjusting air pump, so that the temperature of urea water injection device
Value is maintained above the first value and is less than within the scope of second value；
Step 4, the flow sensor signal of ECU real-time reception air pump, judge current extraction flow whether with it is current
Urea solution injection quantity matches, if it is determined that needing to increase extraction flow, then ECU controls manifold valve and opens, and is vented from bleed branch
Manifold enters in bleed general pipeline.
The invention has the benefit that the present invention heats urea water injection valve using exhaust, system structure is simple,
Operation is simple, while can mix by spraying to urea, is conducive to the catalytic efficiency for improving SCR.
Detailed description of the invention
When considered in conjunction with the accompanying drawings, can be good at understanding that structure of the invention, principle, work are special with reference to following description
Point and advantage, but attached drawing described herein as is used to that of the invention is explained further, and accompanying schematic figure is intended merely to preferably right
The present invention is illustrated, and does not constitute improper restriction to the present invention, in which:
Fig. 1 is the structural schematic diagram of the SCR system of electric engineering car of the present invention；
Fig. 2 is the enlarged drawing of the structural schematic diagram of the urea water injection device in Fig. 1；
Fig. 3 is the schematic diagram of one embodiment of the jet pipe layout of the SCR system of electric engineering car of the present invention；
Fig. 4 is the schematic diagram of another embodiment of the jet pipe layout of the SCR system of electric engineering car of the present invention.
Specific embodiment
Below with reference to example and attached drawing, the invention will be further described, it is noted that following embodiment is only
Be it is schematical, be not intended to limitation the present invention.
As shown in Fig. 1 institute, the SCR system of electric engineering car of the invention includes engine 1, which can be diesel oil
Machine is also possible to gasoline engine, further includes exhaust pipe 3 and the SCR catalyst 4 positioned at 3 downstream of exhaust pipe, exhaust pipe 3 upstream,
The front-end configuration of SCR catalyst 4 has urea water injection device 6, which configures on exhaust pipe 3, and the row of extending into
Inside tracheae 3, to spray urea water into exhaust.Urea water injection device 6 is connected to urea tank 2 by urea water inlet tube,
And there is urea water recurrent canal to be used to remaining urea water returning to urea tank 2.
The temperature of urea water is lower, needs to keep suitable temperature to prevent from freezing.With reference to Fig. 1, Fig. 2, exhaust of the invention
Gas outlet is configured on pipe 3, which is located at the upstream of urea water injection device 6, and one end of air entraining pipe 61 is inserted into exhaust pipe 3
Gas outlet in, the other end leads to the casing 64 of urea water injection device 6.The upper end of the encirclement urea water injection device 6 of casing 64
Portion, interior to have spiralling fin, air entraining pipe 61 enters from the lower end of the casing 64, by fin guiding rear screw
It rises and urea water injection device 6 is heated, finally pass through bleed general pipeline 63 from 64 upper end of casing for being located at urea water injection device 6
Discharge.Bleed pipe valve 611 is provided on air entraining pipe 61, which can be solenoid valve or motor-driven valve, can be to air entraining pipe 61
Aperture be adjusted, to change the capacity in air entraining pipe 61.It is also configured in the upstream of valve 611, on air entraining pipe 61
Bleed branch pipe 62 is not involved in the heating to urea water injection device 6 by urea water injection device 6 by bleed branch pipe 62, directly connection
To bleed general pipeline 63.Bleed branch pipe 62 is provided with manifold valve 621, which can be solenoid valve or motor-driven valve, can be to drawing
The aperture of gas branch pipe 62 is adjusted, to change the capacity in bleed branch pipe 62.
It further include electronic control unit ECU7, for controlling the operation of SCR system.Bleed pipe valve 611 and bleed manifold valve 621 are all
It is connected on ECU7.Temperature sensor 65 is also configured on urea water injection device 6, the temperature sensor is for monitoring urea water spray
The temperature of emitter 6.It can be used for the outlet temperature of monitoring urea water injection device 6 in one embodiment.Temperature sensor 65
It is connect with ECU7, above-mentioned temperature signal is returned in ECU.
Air pump 5 is also configured on the shell of SCR catalyst, which can be vane pump.The air inlet of air pump 5 with
63 connection of bleed general pipeline.The gas outlet of air pump 5 is communicated to jet general pipeline 52.Jet general pipeline 52 is set around the shell of SCR catalyst
It sets.It further include multiple jet pipes 53, one end of each jet pipe 53 and the 52 connection other end of jet general pipeline are inserted into SCR catalyst
Portion.Each jet pipe is all disposed within the upstream in the downstream of urea water injection device 6, SCR catalyst.Air pump 5 is connected to ECU7, and ECU7 can
To control the revolving speed of air pump 5, to control the jet velocity of jet pipe 5.
With reference to Fig. 3, in one embodiment, multiple jet pipes 53 are radially distributed on the periphery of SCR catalyst, and
Position in axial direction is identical.A portion of multiple jet pipes 53 is horizontally disposed, and the jet pipe 53 of any two relative configuration
Spout mutually stagger certain level distance, the jet pipe 53 of two such relative configuration will not generate air-flow and liquidate.Multiple sprays
It is arranged on another part vertical direction of pipe 53, is only respectively set in the embodiments of figure 3 in the bottom and top of SCR catalyst
One jet pipe 53, but it is also possible that multiple jet pipes are respectively set.It is this to be horizontally disposed with, be vertically arranged the side mixed
Formula is conducive to manufacture turbulent flow, urea water can be allowed more sufficient to mix with exhaust.
With reference to Fig. 4, in another embodiment, multiple jet pipes 53 are radially distributed on the periphery of SCR catalyst, and
Position in the axial direction is identical.But the normal of each jet pipe and the circumference normal of SCR catalyst are at an angle of a configuration, for example,
25 degree, 35 degree, 45 degree etc..This setup is conducive to manufacture eddy flow in the front end of SCR catalyst 4.
Particularly, the normal of each jet pipe 53 and SCR catalyst axially angled setting, so that the normal of each jet pipe 53
It is tilted towards urea water injection device 6.Thus each jet pipe 53 is conducive to towards the direction jet of urea water injection device 6 by urea
The urea that water ejector 6 sprays is broken up more uniformly by spraying, and thus the mixing of urea water spray and exhaust is more uniform.
In a further embodiment, position of each jet pipe 53 in the axial direction of SCR catalyst be not identical, can divide in this way
Section setting turbulent flow or eddy flow.This depends on type, the structure of SCR.
Air pump 5 further includes flow sensor, which is connected to ECU7, thus to ECU7 transmission extraction flow letter
Breath.ECU7 controls the urea injecting quantity of urea water injection device according to the demand of engine.
The operating method of SCR system of the invention includes at least following steps:
Step 1, ECU7 receives the signal of engine, and control urea water injection device 6 sprays urea water to exhaust.
Step 2, the signal of ECU7 real-time reception temperature sensor 65, judges whether the received temperature value of institute is lower than first
Value, if it is, ECU7 sends open signal to bleed pipe valve 611, while sending open signal to air pump 5.
For example, illustrating that urea water injection device 6 has when ECU monitors the temperature value of temperature sensor lower than 0 degree and freezing
Risk, at this point, ECU7 control bleed pipe valve 611 open, control air pump 5 start, at this time exhaust will be entered by air entraining pipe 61
Into the casing 64 of urea water injection device 6, heat temperature raising is carried out to urea water injection device 6 by the spirally-guided of fin, most
After being extracted afterwards by air pump 5, the downstream injection by jet pipe 53 in urea water injection device 6 goes out.
In this step, if it is determined that the received temperature value of institute is not less than the first value, then illustrate the knot of urea water injection device 6
Ice risk is little, at this point, ECU7 sends open signal to bleed manifold valve 621, while sending open signal to air pump 5.At this point,
It does not need to heat urea water injection device, exhaust is directly bypassed in air pump, is transported in SCR catalyst by air pump.
Step 3, the signal of ECU7 real-time reception temperature sensor 65 judges whether position is higher than second to the received temperature value of institute
Value, if it is, adjusting the aperture for reducing bleed pipe valve 611 and/or reducing the revolving speed for adjusting air pump 5, so that urea water injection
The temperature value of device 6 is maintained above the first value and is less than within the scope of second value.
Since the temperature of exhaust can change as the output power of engine changes, if delivery temperature increases, in phase
Under same 611 aperture of bleed pipe valve, the temperature of urea water injection device 6 can be increased, and excessively high temperature is unfavorable for urea water
Injection, is also unfavorable for the service life of urea water injection device 6, it is therefore necessary to reduce the aperture of bleed valve 611, when necessary, close bleed
Valve.Certainly, this can also be by the revolving speed of reduction air pump 5, so that by the casing of urea water injection device 6 in the unit time
Capacity, which is reduced, to be realized, however this mode will cause and not have enough jets spraying to urea in the downstream of urea water injection device 6
It is mixed.
Step 4, the flow sensor signal of ECU7 real-time reception air pump 5, judge current extraction flow whether with currently
Urea solution injection quantity match, if it is determined that need to increase extraction flow, then ECU7 controls manifold valve 621 and opens, exhaust from
Bleed branch pipe 62 imports in bleed general pipeline 63.
Exhaust in bleed general pipeline 63 for being mixed in 6 downstream of urea water injection device to urea water spray and exhaust,
The capacity is not to be the bigger the better, due to SCR catalyst structure, the row of a large amount of 6 upstreams of extracted urea water ejector
Gas is used in downstream manufacture mixing be not certain advantageous.Because different SCR catalyst shell structures is different, if taken out
Tolerance is excessive, will cause urea and is not enough by spraying with exhaust in combined upstream.The capacity of extraction should be with the spray of urea water
The amount of penetrating matches.
It in one particular embodiment, further include emergent management step, at least one jet pipe 53 is close to urea water injection
The nozzle of device is arranged, and the spout of jet pipe is at least partly towards the nozzle of urea water injection device.The jet pipe is urgent jet pipe, In
When the pressure monitor of urea water injection device shows ice condition, ECU can control bleed manifold valve 621 to open, and individually control
The jet pipe is opened, and control air pump 5 increases revolving speed, carries out hot gas purging to the nozzle of urea water injection device.
It further include positioned at the gas outlet in SCR catalyst downstream, the gas outlet is by drawing in another special embodiment
Tracheae is communicated to air pump.
By the aperture regulation of bleed valve 611 and bleed manifold valve 621, and monitor the extraction flow and urea water of air pump 5
The temperature of injector 6 can quickly and simply control the temperature of urea water injection device 6, in the range of so that it is maintained needs,
Ensure that there are enough exhaust manufacture eddy flows or turbulent flow in 6 downstream of urea water injection device simultaneously, sufficiently spraying to urea and exhaust carries out
Mixing.Such benefit is not need to carry out excessive intervention to the revolving speed of air pump 5, has adapted to the air exhaust loop of engine complexity
Border, changeable delivery temperature, extraction flow.
Although having been combined embodiment to be described in detail the present invention, it should be understood by those skilled in the art that
Ground is that the present invention is not limited only to specific embodiment, on the contrary, becoming in the various amendments without departing from the application spirit and essence
Shape and replacement are all fallen among the protection scope of the application.
Claims (9)
1. a kind of SCR system of electric engineering car, including engine, exhaust pipe and the SCR catalyst positioned at tailpipe downstream, In
There are urea water injection device in the upstream of the exhaust pipe, the front-end configuration of SCR catalyst, and the urea water injection device configuration is described
On exhaust pipe, and it extend into inside it；The urea water injection device is connected to urea tank, and there is urea water recurrent canal to be used for will
Remaining urea water returns to the urea tank；It further include the operation that electronic control unit ECU is used to control SCR system, which is characterized in that
Gas outlet is configured on the exhaust pipe, it further includes air entraining pipe which, which is located at the upstream of the urea water injection device, described
One end of air entraining pipe is inserted into the gas outlet, and the other end leads to the casing lower end of the urea water injection device；Also wrap
Bleed general pipeline is included, one end of the bleed general pipeline is connected to the casing upper end of the urea water injection device, other end connection
To air pump, the gas outlet of the air pump is connected to by jet general pipeline at least one jet pipe, and one end of each jet pipe and jet are total
Pipe connection, the other end are inserted into inside SCR catalyst, and each jet pipe is all disposed within the downstream of the urea water injection device, SCR is urged
Change the upstream of device.
2. a kind of SCR system of electric engineering car as described in claim 1, which is characterized in that described in the casing surrounds
Urea water injection device upper end, interior to have spiralling fin, the air entraining pipe enters from the lower end of the casing, passes through
Urea water injection device is heated in fin guiding rear screw rising, finally logical from the shell set upper side for being located at urea water injection device
Cross bleed general pipeline discharge.
3. a kind of SCR system of electric engineering car as claimed in claim 2, which is characterized in that be provided on the air entraining pipe
Bleed pipe valve.
4. a kind of SCR system of electric engineering car as claimed in claim 3, which is characterized in that the bleed pipe valve upstream,
It is also configured with bleed branch pipe on the air entraining pipe, is communicates directly to draw by the urea water injection device by the bleed branch pipe
Gas general pipeline.
5. a kind of SCR system of electric engineering car as claimed in claim 4, which is characterized in that be provided in the bleed branch pipe
Bleed manifold valve.
6. a kind of SCR system of electric engineering car as claimed in claim 5, which is characterized in that the bleed pipe valve and bleed branch
Pipe valve is all connected on ECU, and temperature sensor is also configured on the urea water injection device, and the temperature sensor and ECU connect
It connects, for monitoring the temperature of the urea water injection device；The air pump further includes flow sensor, which is connected to
ECU。
7. a kind of SCR system of electric engineering car as claimed in claim 6, which is characterized in that the jet general pipeline is urged around SCR
Change the shell setting of device；The jet pipe is radially distributed on the periphery of SCR catalyst, and position in the axial direction is identical,
A portion of multiple jet pipes is horizontally disposed, is arranged on another part vertical direction of multiple jet pipes, and any two phase
Certain distance is mutually staggered to the spout of the jet pipe of configuration.
8. a kind of SCR system of electric engineering car as claimed in claim 6, which is characterized in that multiple jet pipes are in SCR catalyst
Periphery on it is radially distributed, and position in the axial direction is identical, the normal of each jet pipe and the circumference normal of SCR catalyst
Angled a configuration.
9. a kind of a kind of operating method of the SCR system of electric engineering car as described in claim 6-8 any one, feature
Including the following steps:
Step 1, ECU receives the signal of engine, and control urea water injection device sprays urea water to exhaust；
Step 2, the signal of ECU real-time reception temperature sensor, judges whether the received temperature value of institute is lower than the first value, if
It is that then ECU sends open signal to bleed pipe valve, while sending open signal to air pump；
Step 3, the signal of ECU real-time reception temperature sensing judges whether position is higher than second value to the received temperature value of institute, if
It is then to adjust the aperture for reducing bleed pipe valve and/or reduce the revolving speed for adjusting air pump, so that the temperature value of urea water injection device is tieed up
It holds within the scope of being greater than the first value and be less than second value；
Step 4, the flow sensor signal of ECU real-time reception air pump, judge current extraction flow whether with current urea
Water injection amount matches, if it is determined that needing to increase extraction flow, then ECU controls manifold valve and opens, and is vented from bleed branch manifold
Enter in bleed general pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711141944.0A CN108005762B (en) | 2017-11-17 | 2017-11-17 | A kind of SCR system of electric engineering car |
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| CN201711141944.0A CN108005762B (en) | 2017-11-17 | 2017-11-17 | A kind of SCR system of electric engineering car |
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| CN108005762B true CN108005762B (en) | 2019-11-01 |
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| US10774718B2 (en) | 2018-10-31 | 2020-09-15 | Caterpillar Inc. | Multi-nozzle design to eliminate downstream mixing devices |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998028070A1 (en) * | 1996-12-20 | 1998-07-02 | Clean Diesel Technologies, Inc. | Method and apparatus for reducing harmful emissions from a lean-burn engine by urea injection scr |
| CN101737127B (en) * | 2008-11-25 | 2012-01-25 | 无锡油泵油嘴研究所 | SCP urea injection system for post treatment of diesel engine emissions |
| CN201891478U (en) * | 2010-12-02 | 2011-07-06 | 中国重汽集团济南动力有限公司 | Device for heating urea tank and pipeline of selective catalytic reduction (SCR) system by engine exhaust |
| JP6020105B2 (en) * | 2012-12-07 | 2016-11-02 | いすゞ自動車株式会社 | Diesel engine exhaust gas purification method and exhaust gas purification system |
| CN103933859B (en) * | 2014-03-31 | 2015-09-16 | 上海德凯工业技术有限公司 | A kind of SCR denitration system for acrylonitrile installation vent gas treatment |
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