CN116696525A - Urea supply injection system with double injection functions and control method thereof - Google Patents
Urea supply injection system with double injection functions and control method thereof Download PDFInfo
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- CN116696525A CN116696525A CN202310849961.9A CN202310849961A CN116696525A CN 116696525 A CN116696525 A CN 116696525A CN 202310849961 A CN202310849961 A CN 202310849961A CN 116696525 A CN116696525 A CN 116696525A
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- urea
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- mixing cavity
- air
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 249
- 239000004202 carbamide Substances 0.000 title claims abstract description 249
- 238000002347 injection Methods 0.000 title claims abstract description 168
- 239000007924 injection Substances 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 58
- 239000000243 solution Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 41
- 230000009977 dual effect Effects 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010037544 Purging Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
- 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]
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides a urea supply injection system with a double injection function and a control method thereof, wherein the system comprises a urea supply device, an air auxiliary device and a mixing cavity, and the urea supply device and the air auxiliary device are respectively communicated with the inlet end of the mixing cavity; the urea supply device is used for supplying urea solution into the mixing cavity; the air auxiliary device is used for providing compressed air into the mixing cavity so as to assist urea solution injection; the outlet end of the mixing cavity is communicated with two injection pipelines which are arranged in parallel and are respectively communicated with the ccSCR device and the SCR device; the injection pipeline is sequentially provided with a constant pressure reducing valve and a second electromagnetic valve from one end close to the mixing cavity to one end far away from the mixing cavity, and the constant pressure reducing valve is used for controlling the pressure in the injection pipeline. The urea supply injection system with the double injection function provided by the application has a simple structure, and can realize that two paths of injection pipelines mutually independently and accurately meet the requirements of various working conditions.
Description
Technical Field
The present disclosure relates generally to the field of vehicle aftertreatment control, and more particularly to a urea supply injection system with dual injection and a control method thereof.
Background
SCR (Selective Catalytic Reduction ) is a requisite aftertreatment device in current vehicles, however with increasingly stringent emission regulations, common SCR devices have difficulty reaching the national seventh emission standard to be promulgated in the next few years. Most of research at home and abroad shows that adding a ccSCR (close coupled Selective Catalytic Reduction, close-coupled selective catalytic reduction) device at the front end of the aftertreatment is a very promising solution, so two urea feed injection systems are needed to provide the catalyst.
However, there are some problems with the three urea supply injection systems currently available: the first is to configure a separate urea supply injection system for each SCR device, which results in excessive space and high cost for the urea supply injection system; the second is to use two sets of urea pumping systems to control the corresponding injection respectively, for example, the patent number is: CN202220385900.2, patent name: the scheme only avoids using two sets of urea boxes, and other internal structures are two sets of opposite urea supply devices, so that the structure is complex and the cost is high; the third is to supply two sets of urea injection units with a set of urea pumping system, such as the one described in CN202110891201.5, entitled: the application relates to a urea supply injection system with a two-stage injection function, but in the scheme, two injection units are very interfered with each other, and the injection quantity cannot be accurately controlled.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings of the prior art, it is desirable to provide a urea supply injection system with dual injection function and a control method thereof to solve the above-mentioned problems.
The first aspect of the application provides a urea supply injection system with a double injection function, which comprises a urea supply device, an air auxiliary device and a mixing cavity, wherein the urea supply device and the air auxiliary device are respectively communicated with the inlet end of the mixing cavity; the urea supply device is used for supplying urea solution into the mixing cavity; the air auxiliary device is used for providing compressed air into the mixing cavity so as to assist urea solution injection;
the outlet end of the mixing cavity is communicated with two injection pipelines, and the two injection pipelines are arranged in parallel and are respectively communicated with the ccSCR device and the SCR device; the injection pipeline is sequentially provided with a constant pressure reducing valve and a second electromagnetic valve from one end close to the mixing cavity to one end far away from the mixing cavity, and the constant pressure reducing valve is used for controlling the pressure in the injection pipeline.
According to the technical scheme provided by the embodiment of the application, the urea supply device comprises a urea box and a urea pipeline, wherein urea liquid is contained in the urea box; the urea pipeline comprises a first port and a second port, and the first port and the second port are communicated to the urea tank; a liquid inlet filter screen, a first one-way valve, a urea pump and a first electromagnetic valve are sequentially arranged between the first port and the second port, an external interface is further arranged between the urea pump and the first electromagnetic valve on the urea pipeline, and the external interface is communicated with the mixing cavity; and a reversing valve is arranged between the outer interface and the mixing cavity.
According to the technical scheme provided by the embodiment of the application, the first port is positioned below the urea liquid level, and the second port is positioned above the urea liquid level.
According to the technical scheme provided by the embodiment of the application, the air auxiliary device comprises a compressed air tank and an air pipeline, wherein one end of the air pipeline is communicated with the compressed air tank, and the other end of the air pipeline is communicated with the mixing cavity; the air pipeline is sequentially communicated with an air filter screen, a second one-way valve, an air pump and a throttle valve.
According to the technical scheme provided by the embodiment of the application, the urea heating device comprises a circulating water pipeline and a third electromagnetic valve, wherein the water inlet end of the circulating water pipeline is communicated with a water outlet pipe of engine cooling circulating water, and the water outlet end of the circulating water pipeline is communicated with a water inlet pipe of the engine cooling circulating water; the third electromagnetic valve is arranged at the water inlet end of the circulating water pipeline; the circulating water pipeline comprises a first heating part, a second heating part and a third heating part which are sequentially connected, wherein the first heating part and the third heating part are respectively used for heating the two injection pipelines, and the second heating part is used for heating the urea box.
According to the technical scheme provided by the embodiment of the application, the first heating part and the third heating part are spirally wound on the two injection pipelines respectively.
According to the technical scheme provided by the embodiment of the application, the second heating part stretches into the urea box and is densely distributed in the urea box in a spiral manner.
According to the technical scheme provided by the embodiment of the application, a first pressure sensor is arranged between the urea pump and the external interface and used for detecting the pressure of urea liquid; a second pressure sensor is arranged between the air pump and the mixing cavity and used for detecting the pressure of the compressed air; and a third pressure sensor is arranged between the second electromagnetic valve and the nozzle and is used for detecting the pressure of the gas-liquid mixture.
According to the technical scheme provided by the embodiment of the application, the urea box is internally provided with a liquid level sensor.
A second aspect of the present application provides an injection system control method for controlling a urea supply injection system having a dual injection function as described above, comprising the steps of:
according to the pressure requirements of the ccSCR device and the SCR device on the injection pipeline, respectively adjusting two constant pressure reducing valves;
closing the first electromagnetic valve;
opening the urea supply device and the air assist device;
when urea is required to be provided for the ccSCR device, a second electromagnetic valve on an injection pipeline communicated with the ccSCR device is opened;
when urea needs to be provided for the SCR device, a second electromagnetic valve on an injection pipeline communicated with the SCR device is opened.
Compared with the prior art, the application has the beneficial effects that: by arranging two injection pipelines in parallel, urea can be provided for the ccSCR device and the SCR device by using the two injection pipelines; the two injection pipelines share one urea supply device and one air auxiliary device and are communicated through the mixing cavity, so that the integral integration level of the system is higher, the volume is small, the installation space can be saved, and the production cost is reduced; by arranging the constant pressure reducing valve at the starting position of the injection pipeline, the pressure in the two injection pipelines is ensured not to be influenced by each other, namely, when one injection pipeline is opened or closed, the pressure in the other injection pipeline is not changed along with the opening or closing of the other injection pipeline, so that the stability of the pressure in the injection pipeline is always maintained, and the urea supply efficiency is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a urea supply injection system with dual injection function according to embodiment 1 of the present application;
FIG. 2 is a flow chart showing the steps of a control method of an injection system according to embodiment 2 of the present application;
reference numerals: 101. a urea tank; 102. a urea line; 103. a liquid inlet filter screen; 104. a first one-way valve; 105. a urea pump; 106. a first electromagnetic valve; 107. an external interface; 108. a first pressure sensor; 109. a reversing valve; 110. a liquid level sensor; 201. an air tank; 202. an air line; 203. an air filter screen; 204. a second one-way valve; 205. an air pump; 206. a throttle valve; 207. a second pressure sensor; 301. a mixing chamber; 302. a jet line; 303. a constant pressure reducing valve; 304. a second electromagnetic valve; 305. a nozzle; 306. a third pressure sensor; 401. a circulating water pipeline; 402. and a third solenoid valve.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
Referring to fig. 1, the present application provides a urea supply injection system with dual injection function, comprising a urea supply device, an air auxiliary device and a mixing chamber 301, wherein the urea supply device and the air auxiliary device are respectively communicated with an inlet end of the mixing chamber 301; the urea supply device is used for supplying urea solution into the mixing cavity 301; the air assist device is used for providing compressed air into the mixing cavity 301 to assist urea solution injection;
the outlet end of the mixing cavity 301 is communicated with two injection pipelines 302, and the two injection pipelines 302 are arranged in parallel and are respectively communicated with a ccSCR device and an SCR device; the injection pipeline 302 is sequentially provided with a constant pressure reducing valve 303 and a second electromagnetic valve 304 from one end close to the mixing cavity 301 to one end far away from the mixing cavity 301, and the constant pressure reducing valve 303 is used for controlling the pressure in the injection pipeline 302.
Specifically, two injection pipelines 302 are arranged in parallel, and the two injection pipelines 302 are used for respectively providing urea for the ccSCR device and the SCR device; the constant pressure reducing valve 303 is disposed at one end of the injection pipeline 302 for the gas-liquid mixture to enter, and the constant pressure reducing valve 303 is used for ensuring that the pressure in the injection pipeline 302 is controlled, that is, when only one injection pipeline 302 is required to work, the pressure in the injection pipeline 302 can be kept unchanged no matter whether the other injection pipeline 302 is opened or not, so as to improve the urea supply efficiency; one end of the injection pipeline 302 for discharging the gas-liquid mixture is provided with a nozzle 305, and the nozzle 305 is communicated with the ccSCR device or the SCR device; the second solenoid valve is disposed between the constant pressure reducing valve 303 and the nozzle 305 for controlling the opening and closing of the injection line 302.
Working principle: by providing two of the injection lines 302 and the two injection lines 302 being arranged in parallel, urea can be provided to the ccSCR device and the SCR device respectively by using the two injection lines 302; through sharing one set of urea supply device and one set of air auxiliary device by the two injection pipelines 302 and communicating the two sets of urea supply device and the air auxiliary device through the mixing cavity 301, the integral integration level of the system is higher, the volume is small, the installation space can be saved, and meanwhile, the production cost is reduced; by arranging the constant pressure reducing valve 303 at the starting position of the injection pipeline 302, it is ensured that the pressures of the two injection pipelines 302 do not affect each other, that is, when one injection pipeline 302 is opened or closed, the pressure in the other injection pipeline 302 does not change along with the opening or closing of the other injection pipeline 302, so that the stability of the pressure in the injection pipeline 302 is always maintained, and the urea supply efficiency is improved.
In a preferred embodiment, the urea supply device comprises a urea tank 101 and a urea pipeline 102, wherein urea solution is contained in the urea tank 101; the urea line 102 comprises a first port and a second port, both of which are communicated to the urea tank 101; a liquid inlet filter screen 103, a first one-way valve 104, a urea pump 105 and a first electromagnetic valve 106 are sequentially arranged between the first port and the second port, an external interface 107 is further arranged between the urea pump 105 and the first electromagnetic valve 106 in the urea pipeline 102, and the external interface 107 is communicated with the mixing cavity 301; a reversing valve 109 is arranged between the outer port 107 and the mixing chamber 301.
Specifically, the first port is used as a liquid inlet end of urea liquid, and the second port is used as a liquid outlet end of urea liquid; a reversing valve 109 is arranged between the outer interface 107 and the mixing cavity 301; the liquid inlet filter screen 103 is used for filtering impurities in urea liquid to protect subsequent parts; the urea pump 105 is used for pumping urea solution in the urea tank 101; the first check valve 104 is communicated from the first port to the second port for controlling the flow direction of urea solution; the first electromagnetic valve 106 is configured to control the opening and closing of the second port and the urea tank 101, and when the first electromagnetic valve 106 is opened, if the urea pump 105 starts to work, under the action of the urea pump 105, urea solution entering the urea pipeline 102 will flow back into the urea tank 101 from the second port; when the first electromagnetic valve 106 is closed, if the urea pump 105 starts to operate, the urea solution entering the urea pipe 102 will not flow back to the urea tank 101 from the second port under the action of the urea pump 105, and the urea solution will enter the mixing chamber 301 from the external port 107 via the reversing valve 109, and note that the conducting direction of the reversing valve 109 should be the conducting direction from the external port 107 to the mixing chamber 301.
In a preferred embodiment, the first port is below the urea level and the second port is above the urea level.
Specifically, by placing the first port below the urea level, urea solution is conveniently drawn into the urea line 102 by the action of the urea pump 105; by placing the second port below the urea level, the first solenoid valve 106 is always closed during the injection of urea solution, and if the second port is placed below the urea level, the urea solution in the second port cannot keep flowing, so that urea is easy to crystallize at the second port, and thus the second port is blocked.
In a preferred embodiment, the air auxiliary device comprises a compressed air tank 201 and an air pipeline 202, wherein one end of the air pipeline 202 is communicated with the compressed air tank 201, and the other end is communicated with the mixing cavity 301; the air pipeline 202 is sequentially communicated with an air filter 203, a second one-way valve 204, an air pump 205 and a throttle valve 206.
Specifically, the air filter 203, the second check valve 204, the air pump 205 and the throttle valve 206 are disposed on the air pipeline 202, and are sequentially arranged from one end of the air pipeline 202 close to the air tank 201 to one end far from the air tank 201; the air filter 203 is used for filtering particle impurities in the air so as to protect subsequent parts; the second check valve 204 is used for preventing urea solution in the urea pipeline 102 from entering the compressed air tank 201 and simultaneously preventing gas from flowing back; the air pump 205 sucks the air in the air tank 201 into the air pipeline 202, pressurizes the air and then delivers the air into the mixing cavity 301, so as to increase the pressure of the gas-liquid mixture in the mixing cavity 301 and assist urea injection; the throttle valve 206 is used to ensure stability of air pressure.
Specifically, the air assist device is used for assisting urea injection, and cleaning the urea pipeline 102 and the injection pipeline 302 through compressed air, so as to avoid pipeline blockage caused by crystallization of urea in the pipeline.
In a preferred embodiment, a urea heating device is further provided, the urea heating device comprises a circulating water pipeline 401 and a third electromagnetic valve 402, the water inlet end of the circulating water pipeline 401 is communicated with a water outlet pipe of engine cooling circulating water, and the water outlet end of the circulating water pipeline 401 is communicated with a water inlet pipe of the engine cooling circulating water; the third electromagnetic valve 402 is arranged at the water inlet end of the circulating water pipeline 401; the circulating water pipeline 401 includes a first heating portion, a second heating portion, and a third heating portion that are sequentially connected, where the first heating portion and the third heating portion are respectively used for heating the two injection pipelines 302, and the second heating portion is used for heating the urea tank 101.
Specifically, the first heating part, the second heating part and the third heating part are sequentially arranged from one end of a water outlet pipe close to the engine cooling circulating water to one end far from the engine circulating water outlet pipe; the first heating part and the third heating part are closely attached to the injection pipeline 302, and the second heating part extends into the urea tank 101; the working principle of the circulating water pipeline 401 is that high-temperature cooling water used after the engine is cooled is respectively transmitted to the two injection pipelines 302 and the urea tank 101, and the high temperature of the high-temperature cooling water is used for heating the urea solution in the injection pipelines 302 and the gas-liquid mixture in the urea tank 101, so that the pipeline blockage caused by urea crystallization is prevented. The third electromagnetic valve 402 is disposed between the first heating portion and the engine cooling circulating water outlet pipe, and is used for controlling on-off between the first heating portion and the engine cooling circulating water outlet pipe.
In a preferred embodiment, the first heating portion and the third heating portion are respectively spirally wound around the two injection lines 302.
By arranging the first heating portion and the third heating portion to spirally surround the two injection pipes 302, the contact area between the first heating portion and the third heating portion is increased as much as possible on the basis of a certain length of the injection pipes 302, and the heating efficiency of the gas-liquid mixture in the injection pipes 302 is improved.
In a preferred embodiment, the second heating part extends into the urea tank 101 and is densely arranged in a spiral shape in the urea tank 101.
By extending the second heating portion into the urea tank 101 and spirally densely arranging the fins, the contact area between the second heating portion and the urea solution is increased, and the heating efficiency of the urea solution in the urea tank 101 is improved.
In another embodiment, the urea heating device may be replaced by an electric heating plate, and the urea solution in the injection pipeline 302 and the urea tank 101 may be directly heated by the electric heating plate; when the heating device is replaced by the electric heating plate, the electric heating plate is directly controlled to work by the controller without arranging the third electromagnetic valve 402.
In a preferred embodiment, a first pressure sensor 108 is arranged between the urea pump 105 and the external interface 107 for detecting the pressure of the urea solution; a second pressure sensor 207 is arranged between the air pump 205 and the mixing chamber 301 for detecting the pressure of the compressed air; a third pressure sensor 306 is arranged between the second electromagnetic valve 304 and the nozzle 305 for detecting the pressure of the gas-liquid mixture.
By setting the first pressure sensor 108, the pressure in the urea pipeline 102 can be detected, the pressure of urea liquid is monitored in real time, and the pressure in the urea pipeline 102 can be conveniently and timely adjusted and maintained when the pressure is abnormal, so that the reliability of the system is improved. By providing the second pressure sensor 207, the pressure in the air pipeline 202 can be detected, and the pressure of the compressed air can be monitored in real time, so that when the pressure in the air pipeline 202 is abnormal, the system can be adjusted and maintained in time, and the reliability of the system is further improved. By arranging the third sensor 306, the pressure in the injection pipeline 302 can be detected, and the pressure of the gas-liquid mixture can be detected in real time, so that the adjustment and maintenance can be conveniently performed in time when the pressure in the injection pipeline 302 is abnormal, and the reliability of the system is further improved.
In a preferred embodiment, a level sensor 110 is provided in the urea tank 101.
Through set up level sensor 110 in urea case 101 for but real-time supervision urea volume in the urea case 101, the convenience is in time supplemented urea when the urea volume is not enough, further improves the reliability of system.
The urea supply injection system with the dual injection function provided in embodiment 1 of the present application includes four working modes, where the four working modes are respectively: standby mode, build pressure pre-injection mode, injection mode and pressure relief purge mode; the urea supply injection system with the dual injection function needs to go through the four modes in sequence in each working process.
Example 2
Referring to fig. 2, the present application provides a method for controlling an injection system for controlling a urea supply injection system with dual injection function as described in embodiment 1, comprising the steps of:
s1: according to the pressure requirements of the ccSCR device and the SCR device on the injection pipeline 302, two constant pressure reducing valves 303 are respectively adjusted;
s2: closing the first solenoid valve 106;
s3: opening the urea supply device and the air assist device;
s4: when urea needs to be provided to the ccSCR device, a second solenoid valve 304 on an injection line 302 in communication with the ccSCR device is opened;
when urea is desired to be provided to the SCR device, a second solenoid valve 304 on an injection line 302 in communication with the SCR device is opened.
Specifically, the constant pressure reducing valve 303 is configured to adjust the pressure of the gas-liquid mixture transferred from the mixing chamber 301, and the constant pressure reducing valve 303 is capable of reducing the pressure of the gas-liquid mixture to a certain set pressure, regardless of the pressure of the gas-liquid mixture entering the constant pressure reducing valve 303, so as to adapt to the requirements of the ccSCR device and the SCR device on the injection pressure of the gas-liquid mixture.
Specifically, the method provided in this embodiment is used to switch the urea supply injection system with dual injection function described in embodiment 1 to the injection mode.
Specifically, the constant pressure reducing valve 303 is first adjusted according to the ccSCR device and the requirement of the SCR device for the injection pressure of the injection pipeline 302; then closing the first electromagnetic valve 106 and opening the urea pump 105 and the air pump 106, as the first electromagnetic valve 106 is closed, as the urea pump 105 works to enable the pressure in the urea pipeline 102 to be larger and larger, urea liquid is transmitted to the external interface 107 and enters the mixing cavity 301 through the reversing valve 109, and as the air pump 205 works to enable compressed air to enter the mixing cavity 301, compressed air and urea liquid form a high-pressure gas-liquid mixture after being mixed in the mixing cavity 301, the gas-liquid mixture is respectively transmitted to two fixed pressure reducing valves 303 from the outlets of the mixing cavity 301, and the gas-liquid mixture enters the injection pipeline 302 after being limited in pressure by the fixed pressure reducing valves 303; finally, when urea is required to be provided for the ccSCR device, opening a second electromagnetic valve 304 on an injection pipeline 302 communicated with the ccSCR device, so that urea can be provided for the ccSCR device; when the SCR device is required to provide urea, a second electromagnetic valve 304 on an injection pipeline 302 communicated with the SCR device is opened, so that the SCR device can be provided with urea.
The method provided by the embodiment can respectively provide urea for the ccSCR device and the SCR device through one urea supply device and one air auxiliary device, and simultaneously ensure that the pressures of the gas-liquid mixtures in the two injection pipelines 302 do not influence each other when the urea is provided for the ccSCR device and the SCR device respectively, so that the urea supply efficiency is improved.
Example 3
The present embodiment provides a control method for switching the urea supply injection system with dual injection function of embodiment 1 to the standby mode, comprising the steps of:
s1, controlling the first electromagnetic valve 106 to be closed;
s2, the urea pump 105 and the air pump 205 are controlled to be turned off.
Specifically, when the system is placed in the standby mode, since the first check valve 104 and the urea pump 105 are both in the closed state, and the second port is above the urea liquid level, the urea liquid cannot flow from the first port to the second port through the urea pipeline, and cannot enter the urea pipeline 102 from the second port, so that the urea liquid is prevented from entering the urea pipeline 102 and crystallizing in the urea pipeline 102 to cause pipeline blockage.
Example 4
The present embodiment provides a control method for controlling the urea supply injection system with dual injection function of embodiment 1 to switch to the pressure build pre-injection mode, comprising the steps of:
s1: controlling the reversing valve 109 to be communicated from the mixing cavity 301 to the direction of the external interface 107;
s2: controlling the first electromagnetic valve 106 to be opened;
s3: control the urea pump 105 to turn on and control the air pump 205 to turn off.
Specifically, when the system is placed in the pressure build-up pre-injection mode, the urea pump 105 pumps urea solution from the urea tank 101 to the urea pipeline 102 through the first port, and as the reversing valve 109 is conducted from the mixing chamber 301 to the direction of the external port 107, and the first electromagnetic valve 106 is opened, the urea solution entering the urea pipeline 102 flows back to the urea tank 101 through the second port; the system is conventionally placed in the pre-injection stage for 30 seconds, in order to fill the urea line 102 with urea solution, facilitating the subsequent injection of urea solution, i.e. in preparation for the subsequent placement of the system in the injection mode.
Example 5
The present embodiment provides a control method for controlling the urea supply injection system with dual injection function according to the embodiment to switch to the pressure relief purge mode, including the following steps:
s1: control the conduction of the reversing valve 109 from the mixing chamber 301 in the direction of the external port 107:
s2: controlling the first solenoid valve 106 and the second solenoid valve 304 to open;
s3: control the urea pump 105 to turn off and control the air pump 205 to turn on.
Specifically, when the system is placed in the pressure relief purge mode, since the reversing valve 109 is turned on from the mixing chamber 301 in the direction of the external port 107, the first solenoid valve 106 and the second solenoid valve 304 are opened, the urea pump 105 is closed and the air pump 205 is opened, so that compressed air is respectively delivered into the urea line 102 and the injection line 302 via the mixing chamber 301; in the urea pipeline 102, due to the arrangement of the first check valve 104, compressed air can only enter the urea tank 101 from the second port, so as to assist the urea remained in the urea tank 101 to be discharged out of the urea tank 101, thereby ensuring the distinction of the urea pipeline 102, and the urea pipeline 102 is blocked due to crystallization of surface urea in the urea pipeline 102; in the injection pipeline 302, the compressed air assists the urea in the injection pipeline 302 to be discharged out of the injection pipeline 302, so that the cleaning of the injection pipeline 302 is ensured, and the blockage of the injection pipeline 302 caused by the crystallization of the urea in the injection pipeline 302 is avoided.
In a preferred embodiment, the urea pump 105 is a unidirectional pump or a bi-directional pump.
Specifically, when the urea pump 105 is a one-way pump, urea solution can be pumped only during the injection phase and flow from the first port to the second port; when the urea pump 105 is a bidirectional pump, besides the function of pumping urea solution during the injection stage, the urea pump 105 can be reversely opened during the pressure relief purging stage, the first electromagnetic valve 106 is closed, and the pressure provided by the urea pump 105 is utilized to enable urea at the nozzle 305 to be sucked back and flow, and the urea enters the urea tank 101 after passing through the reversing valve 107 and the urea pipeline 102, so that the pipeline is further cleaned.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (10)
1. A urea supply injection system with double injection function is characterized in that,
comprises a urea supply device, an air auxiliary device and a mixing cavity (301), wherein the urea supply device and the air auxiliary device are respectively communicated with the inlet end of the mixing cavity (301); the urea supply device is used for providing urea solution into the mixing cavity (301); the air auxiliary device is used for providing compressed air into the mixing cavity (301) so as to assist urea solution injection;
the outlet end of the mixing cavity (301) is communicated with two injection pipelines (302), and the two injection pipelines (302) are arranged in parallel and are respectively communicated with the ccSCR device and the SCR device; the injection pipeline (302) is sequentially provided with a constant pressure reducing valve (303) and a second electromagnetic valve (304) from one end close to the mixing cavity (301) to one end far away from the mixing cavity (301), and the constant pressure reducing valve (303) is used for controlling the pressure in the injection pipeline (302).
2. The urea supply injection system with the dual injection function according to claim 1, wherein the urea supply device comprises a urea tank (101) and a urea pipeline (102), and urea liquid is contained in the urea tank (101); the urea pipeline (102) comprises a first port and a second port, and the first port and the second port are communicated with the urea tank (101); a liquid inlet filter screen (103), a first one-way valve (104), a urea pump (105) and a first electromagnetic valve (106) are sequentially arranged between the first port and the second port, an external interface (107) is further arranged between the urea pump (105) and the first electromagnetic valve (106) in the urea pipeline (102), and the external interface (107) is communicated with the mixing cavity (301); a reversing valve (109) is arranged between the outer interface (107) and the mixing cavity (301).
3. The dual injection urea supply injection system of claim 2, wherein the first port is below the urea level and the second port is above the urea level.
4. Urea supply injection system with dual injection function according to claim 2, characterized in that the air auxiliary device comprises a compressed air tank (201) and an air line (202), said air line (202) communicating with the compressed air tank (201) at one end and with the mixing chamber (301) at the other end; the air pipeline (202) is sequentially communicated with an air filter screen (203), a second one-way valve (204), an air pump (205) and a throttle valve (206).
5. The urea supply injection system with the double injection function according to claim 4, further comprising a urea heating device, wherein the urea heating device comprises a circulating water pipeline (401) and a third electromagnetic valve (402), the water inlet end of the circulating water pipeline (401) is communicated with a water outlet pipe of the engine cooling circulating water, and the water outlet end of the circulating water pipeline (401) is communicated with a water inlet pipe of the engine cooling circulating water; the third electromagnetic valve (402) is arranged at the water inlet end of the circulating water pipeline (401); the circulating water pipeline (401) comprises a first heating part, a second heating part and a third heating part which are sequentially connected, wherein the first heating part and the third heating part are respectively used for heating the two injection pipelines (302), and the second heating part is used for heating the urea tank (101).
6. The urea supply injection system with dual injection function according to claim 5, wherein the first heating portion and the third heating portion are spirally wound around the two injection lines (302), respectively.
7. The urea supply injection system with dual injection function according to claim 6, wherein the second heating part extends into the urea tank (101) and is densely arranged in a spiral shape in the urea tank (101).
8. The urea supply injection system with dual injection function according to claim 7, characterized in that a first pressure sensor (108) is arranged between the urea pump (105) and the external interface (107) for detecting the pressure of the urea solution; a second pressure sensor (207) is arranged between the air pump (205) and the mixing cavity (301) and is used for detecting the pressure of compressed air; a third pressure sensor (306) is arranged between the second electromagnetic valve (304) and the nozzle (305) and is used for detecting the pressure of the gas-liquid mixture.
9. The urea supply injection system with dual injection function according to claim 8, characterized in that a liquid level sensor (110) is provided in the urea tank (101).
10. An injection system control method for controlling the urea supply injection system having a dual injection function according to any one of claims 1 to 9, characterized by comprising the steps of:
according to the pressure requirements of the ccSCR device and the SCR device on the injection pipeline (302), respectively adjusting two constant pressure reducing valves (303);
closing the first solenoid valve (106);
opening the urea supply device and the air assist device;
when urea needs to be provided for the ccSCR device, a second electromagnetic valve (304) on an injection pipeline (302) communicated with the ccSCR device is opened;
when urea needs to be provided to the SCR device, a second solenoid valve (304) on an injection line (302) in communication with the SCR device is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310849961.9A CN116696525A (en) | 2023-07-11 | 2023-07-11 | Urea supply injection system with double injection functions and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310849961.9A CN116696525A (en) | 2023-07-11 | 2023-07-11 | Urea supply injection system with double injection functions and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116696525A true CN116696525A (en) | 2023-09-05 |
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ID=87845205
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310849961.9A Pending CN116696525A (en) | 2023-07-11 | 2023-07-11 | Urea supply injection system with double injection functions and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116696525A (en) |
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2023
- 2023-07-11 CN CN202310849961.9A patent/CN116696525A/en active Pending
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