CN112627947A - Urea pump, anti-blocking control method thereof, SCR device and urea injection system - Google Patents
Urea pump, anti-blocking control method thereof, SCR device and urea injection system Download PDFInfo
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- CN112627947A CN112627947A CN202011503407.8A CN202011503407A CN112627947A CN 112627947 A CN112627947 A CN 112627947A CN 202011503407 A CN202011503407 A CN 202011503407A CN 112627947 A CN112627947 A CN 112627947A
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- urea pump
- bypass pipeline
- urea
- pressure difference
- control valve
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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]
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1426—Filtration means
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a urea pump and an anti-blocking control method thereof, an SCR device and a urea injection system, wherein the urea pump comprises a first filtering device, a first pressure difference detection device and a bypass pipeline, the first filtering device is arranged on the pipeline of the urea pump, and the first pressure difference detection device is used for detecting the pressure difference at two ends of the first filtering device; the bypass pipeline is connected with the first filtering device in parallel, and a control valve is arranged on the bypass pipeline; the first pressure difference detection device and the control valve are respectively connected with a controller of the urea pump, and the controller of the urea pump controls the control valve to be opened when the first pressure difference detection device detects that the pressure difference at the two ends of the first filtering device is greater than a preset value; through the parallelly connected bypass pipeline in urea pump first filter equipment's both ends, when first filter equipment blockked up, accessible bypass pipeline carries out the system and builds pressure, avoids because the urea pump that first filter equipment blockked up the cause is thought the emergence of the condition of trouble piece by mistake, reduces user's unnecessary loss, improves urea pump's reliability, improves user and uses experience.
Description
Technical Field
The invention relates to the technical field of diesel engine air management systems, in particular to a urea pump, an anti-blocking control method of the urea pump, an SCR device and a urea injection system.
Background
At present, when a urea injection system enters normal work, if the injection system cannot work normally due to blockage caused by impurities at a filter element of a urea pump, a control unit can give instructions for a plurality of times to enable the urea injection system to work again, however, after the control unit gives instructions for preset times, the urea injection system still cannot work normally, the control unit can give a urea pump fault signal and limit the whole vehicle, the urea pump only needing to replace the filter element is mistakenly considered to have a fault due to the condition, unnecessary loss is easily brought to a user, and the use of the user can be influenced.
Disclosure of Invention
The first purpose of the invention is to provide a urea pump, so as to avoid the situation that the urea pump is mistaken for a fault part due to the blockage of a filter element, improve the reliability of the urea pump and improve the use experience of a user.
A second object of the present invention is to provide a urea pump anti-clogging control method, a urea injection system, and an SCR device based on the urea pump.
In order to achieve the purpose, the invention provides the following technical scheme:
a urea pump, including set up in the first filter equipment on urea pump's the pipeline still includes:
first differential pressure detecting means for detecting a differential pressure across the first filtering means;
the bypass pipeline is connected with the first filtering device in parallel, and a control valve for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline;
the first pressure difference detection device and the control valve are respectively connected with a controller of the urea pump, and the controller of the urea pump controls the control valve to be opened to conduct the bypass pipeline when the first pressure difference detection device detects that the pressure difference between the two ends of the first filtering device is greater than a preset value.
Preferably, the device further comprises an alarm device, the alarm device is connected with a controller of the urea pump, and the controller of the urea pump controls the alarm device to output a blockage fault signal while controlling the control valve to be opened.
Preferably, the control valve is a solenoid valve.
Preferably, the number of the bypass pipelines is at least two, and the control valve is arranged on each bypass pipeline.
Preferably, at least one of the by-pass lines is provided with a second filter device, which is located upstream and/or downstream of the control valve of the by-pass line.
Preferably, the system further comprises a second differential pressure detection device for detecting the differential pressure at two ends of the bypass pipeline, and the second differential pressure detection device is connected with the vehicle control unit.
A urea injection system comprising a urea pump as claimed in any one of the preceding claims.
An SCR device comprising a urea injection system as described above.
A urea pump anti-clogging control method based on the urea pump comprises the following steps:
1) sending a system pressure building signal to the urea pump, obtaining pressure values at two ends of a first filtering device of the urea pump, calculating pressure difference at two ends of the first filtering device, executing system pressure building by the urea pump if the pressure difference at two ends of the first filtering device is smaller than or equal to a preset value, and entering step 2 if the pressure difference at two ends of the first filtering device is larger than the preset value;
2) and a control valve of the bypass pipeline is controlled to be opened, and the urea pump executes system pressure building through the bypass pipeline.
Preferably, the method further comprises the steps of:
3) the control valve of the bypass pipeline is controlled to be opened, and meanwhile, a blocking fault signal is output to a user;
4) and obtaining pressure values at two ends of the bypass pipeline, calculating pressure difference at two ends of the bypass pipeline, if the pressure difference at two ends of the bypass pipeline is less than or equal to a preset value, keeping the current state of the urea pump, and if the pressure difference at two ends of the bypass pipeline is greater than the preset value, controlling the urea pump to stop and limiting the torque of the whole vehicle.
According to the technical scheme, the urea pump comprises a first filtering device, a first pressure difference detection device and a bypass pipeline, wherein the first filtering device is arranged on the pipeline of the urea pump and used for filtering urea pumped out by the urea pump; the bypass pipeline is connected with the first filtering device in parallel, and a control valve for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline; the first pressure difference detection device and the control valve are respectively connected with a controller of the urea pump, and the controller of the urea pump controls the control valve to open to conduct the bypass pipeline when the first pressure difference detection device detects that the pressure difference at the two ends of the first filtering device is greater than a preset value; when the system pressure building device is applied, firstly, a system pressure building signal is sent to the urea pump, after the system pressure building signal is obtained, the urea pump is started, pressure values at two ends of a first filtering device of the urea pump are obtained, the pressure difference at two ends of the first filtering device is calculated, if the pressure difference at two ends of the first filtering device is smaller than or equal to a preset value, the first filtering device is not blocked, the urea pump executes the system pressure building, if the pressure difference at two ends of the first filtering device is larger than the preset value, the first filtering device is blocked, a control valve of a bypass pipeline is controlled to be opened, and the urea pump executes the system pressure building through the bypass pipeline; therefore, the bypass pipelines are connected in parallel at the two ends of the first filtering device of the urea pump, and system pressure build-up can be carried out through the bypass pipelines when the first filtering device is blocked, so that the condition that the urea pump is mistakenly considered as a fault part due to the blockage of the first filtering device is avoided, unnecessary loss of a user is reduced, the reliability of the urea pump is improved, and the use experience of the user is improved.
The urea injection system and the SCR device have the beneficial effects of the urea pump, and the description is omitted herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a partial structure of a urea pump according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for controlling anti-clogging of a urea pump according to an embodiment of the present invention.
Wherein:
1 is a first differential pressure detection device; 2 is a first filtering device; and 3 is a control valve.
Detailed Description
The invention provides a urea pump, which aims to avoid the condition that the urea pump is mistaken for a fault part due to filter element blockage, improve the reliability of the urea pump and improve the use experience of a user.
The invention also provides a urea pump anti-clogging control method comprising the urea pump, a urea injection system and an SCR device.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic view of a partial structure of a urea pump according to an embodiment of the present invention.
The embodiment of the invention discloses a urea pump which comprises a first filtering device 2, a first differential pressure detection device 1 and a bypass pipeline.
The first filtering device 2 is arranged on a pipeline of the urea pump and used for filtering urea pumped out by the urea pump, and the first pressure difference detection device 1 is used for detecting the pressure difference at two ends of the first filtering device 2; the bypass pipeline is connected with the first filtering device 2 in parallel, one or more bypass pipelines can be arranged, and a control valve 3 for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline; the first differential pressure detection device 1 and the control valve 3 are respectively connected with a controller of the urea pump, and the controller of the urea pump controls the control valve 3 to be opened to conduct the bypass pipeline when the first differential pressure detection device 1 detects that the differential pressure at the two ends of the first filtering device 2 is greater than a preset value.
It can be seen that, when the urea pump provided in the embodiment of the present invention is applied, a system pressure buildup signal is first sent to the urea pump, after the system pressure buildup signal is obtained, the urea pump is started, pressure values at two ends of a first filtering device 2 of the urea pump are obtained, a differential pressure at two ends of the first filtering device 2 is calculated, if the differential pressure at two ends of the first filtering device 2 is less than or equal to a preset value, the first filtering device 2 is not blocked, the urea pump executes the system pressure buildup, if the differential pressure at two ends of the first filtering device 2 is greater than the preset value, it is described that the first filtering device 2 is blocked, a control valve 3 of a bypass pipeline is controlled to be opened, and the urea pump executes the system pressure buildup through the bypass pipeline; therefore, the bypass pipelines are connected in parallel at the two ends of the first filtering device 2 of the urea pump, and system pressure build-up can be carried out through the bypass pipelines when the first filtering device 2 is blocked, so that the condition that the urea pump is mistakenly considered as a fault part due to the blockage of the first filtering device is avoided, unnecessary loss of a user is reduced, the reliability of the urea pump is improved, and the use experience of the user is improved.
Preferably, the urea pump further comprises an alarm device, the alarm device is connected with a controller of the urea pump, and the controller of the urea pump controls the alarm device to output a blockage fault signal while controlling the control valve 3 to be opened so as to remind a user to clean and replace the first filtering device 2 of the urea pump after the urea pump is stopped.
Preferably, the control valve 3 is a solenoid valve.
In a preferred embodiment of the present invention, at least two bypass pipelines are provided, and each bypass pipeline is provided with a control valve 3, so that the control valves 3 on each bypass pipeline can be controlled to realize the conduction or the closing of each bypass pipeline, and when the control valve 3 of one bypass pipeline is in failure or is blocked, the normal operation of the system pressure build-up can be ensured through other bypass pipelines, thereby improving the reliability of the urea pump.
Furthermore, at least one bypass pipeline is provided with a second filtering device, the second filtering device is positioned at the upstream and/or downstream of the control valve 3 of the bypass pipeline, and the second filtering device is used for filtering the urea flowing through the bypass pipeline, so that the probability of blockage of a urea nozzle is reduced.
Preferably, the system further comprises a second differential pressure detection device for detecting the differential pressure at the two ends of the bypass pipeline, the second differential pressure detection device is connected with the vehicle control unit, and when the second differential pressure detection device detects that the differential pressure at the two ends of the bypass pipeline is greater than a preset value, the urea pump is controlled to stop to protect the urea pump, and the torque limitation of the vehicle is performed.
The embodiment of the invention also provides a urea injection system and an SCR device comprising the urea pump, and as the urea pump has the technical effects, please refer to the embodiment for the technical effects of the urea injection system and the SCR device comprising the urea pump.
Further, an embodiment of the present invention further provides a urea pump anti-clogging control method based on the urea pump described in the foregoing embodiment, as shown in fig. 2, the control method includes the steps of:
1) sending a system pressure building signal to the urea pump, obtaining pressure values at two ends of a first filtering device 2 of the urea pump, calculating pressure difference at two ends of the first filtering device 2, if the pressure difference at two ends of the first filtering device 2 is smaller than or equal to a preset value, executing system pressure building by the urea pump, and if the pressure difference at two ends of the first filtering device 2 is larger than the preset value, entering the step 2);
after a system pressure reduction signal is obtained, the urea pump is controlled to start and simultaneously the pressure difference between the two ends of the first filtering device 2 of the urea pump is obtained, if the pressure difference between the two ends of the first filtering device 2 is smaller than or equal to a preset value, the urea pump keeps acting, the system pressure is built, and if the pressure difference between the two ends of the first filtering device 2 is larger than the preset value, the first filtering device 2 is indicated to be blocked.
2) A control valve 3 of the bypass pipeline is controlled to be opened, and the urea pump executes system pressure building through the bypass pipeline;
when the first filtering device 2 is blocked, the system pressure building can not be realized only by the section of the pipeline provided with the first filtering device 2, and at the moment, the control valve 3 on the bypass pipeline needs to be opened, and the system pressure building is realized by utilizing the bypass pipeline.
Preferably, the control method further includes the steps of:
3) the control valve 3 of the bypass pipeline is controlled to be opened, and simultaneously a blockage fault signal is output to a user;
to remind the user to clean and replace the first filter device 2 of the urea pump after stopping.
4) Acquiring pressure values at two ends of a bypass pipeline, calculating pressure difference at two ends of the bypass pipeline, if the pressure difference at two ends of the bypass pipeline is less than or equal to a preset value, keeping the current state of the urea pump, and if the pressure difference at two ends of the bypass pipeline is greater than the preset value, controlling the urea pump to stop and limiting the torque of the whole vehicle;
if the pressure difference between the two ends of the bypass pipeline is also larger than the preset value, the control valve 3 of the bypass pipeline fails to be opened in time or the control valve 3 and the second filtering device are blocked, the system pressure build-up cannot be realized at the moment, and the urea pump is stopped to protect the urea pump and limit the torque of the whole vehicle.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a urea pump, is including setting up in first filter equipment on urea pump's the pipeline, its characterized in that still includes:
first differential pressure detecting means for detecting a differential pressure across the first filtering means;
the bypass pipeline is connected with the first filtering device in parallel, and a control valve for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline;
the first pressure difference detection device and the control valve are respectively connected with a controller of the urea pump, and the controller of the urea pump controls the control valve to be opened to conduct the bypass pipeline when the first pressure difference detection device detects that the pressure difference between the two ends of the first filtering device is greater than a preset value.
2. The urea pump of claim 1, further comprising an alarm device connected to a controller of the urea pump, wherein the controller of the urea pump controls the alarm device to output a jam fault signal while controlling the control valve to open.
3. A urea pump according to claim 1 or 2, characterized in that the control valve is a solenoid valve.
4. Urea pump according to claim 1 or 2, characterized in that the bypass line is provided with at least two and that the control valve is provided on each bypass line.
5. Urea pump according to claim 4, characterized in that at least one of the by-pass lines is provided with a second filter means, which is located upstream and/or downstream of the control valve of the by-pass line.
6. The urea pump of any one of claims 1, 2 and 5, further comprising a second differential pressure detection device for detecting a differential pressure across the bypass line, the second differential pressure detection device being connected to a vehicle control unit.
7. A urea injection system comprising a urea pump according to any one of claims 1-6.
8. An SCR device comprising the urea injection system of claim 7.
9. A urea pump anti-clogging control method based on the urea pump of any one of claims 1-6, characterized by comprising the steps of:
1) sending a system pressure building signal to the urea pump, obtaining pressure values at two ends of a first filtering device of the urea pump, calculating pressure difference at two ends of the first filtering device, executing system pressure building by the urea pump if the pressure difference at two ends of the first filtering device is smaller than or equal to a preset value, and entering step 2 if the pressure difference at two ends of the first filtering device is larger than the preset value;
2) and a control valve of the bypass pipeline is controlled to be opened, and the urea pump executes system pressure building through the bypass pipeline.
10. The urea pump anti-clogging control method of claim 9, further comprising the steps of:
3) the control valve of the bypass pipeline is controlled to be opened, and meanwhile, a blocking fault signal is output to a user;
4) and obtaining pressure values at two ends of the bypass pipeline, calculating pressure difference at two ends of the bypass pipeline, if the pressure difference at two ends of the bypass pipeline is less than or equal to a preset value, keeping the current state of the urea pump, and if the pressure difference at two ends of the bypass pipeline is greater than the preset value, controlling the urea pump to stop and limiting the torque of the whole vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011503407.8A CN112627947B (en) | 2020-12-18 | 2020-12-18 | Urea pump, anti-blocking control method thereof, SCR device and urea injection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011503407.8A CN112627947B (en) | 2020-12-18 | 2020-12-18 | Urea pump, anti-blocking control method thereof, SCR device and urea injection system |
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| CN112627947A true CN112627947A (en) | 2021-04-09 |
| CN112627947B CN112627947B (en) | 2022-04-05 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112627947B (en) | 2022-04-05 |
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