CN114251160A - Urea back-pumping system, method and vehicle - Google Patents
Urea back-pumping system, method and vehicle Download PDFInfo
- Publication number
- CN114251160A CN114251160A CN202011003675.3A CN202011003675A CN114251160A CN 114251160 A CN114251160 A CN 114251160A CN 202011003675 A CN202011003675 A CN 202011003675A CN 114251160 A CN114251160 A CN 114251160A
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- Prior art keywords
- urea
- air
- air pipeline
- nozzle
- controller
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 190
- 239000004202 carbamide Substances 0.000 title claims abstract description 190
- 238000005086 pumping Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
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]
- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- 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
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
-
- 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
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 invention relates to the technical field of vehicle control, and provides a urea back-pumping system, a urea back-pumping method and a vehicle, wherein the system comprises a urea nozzle, an air pipeline, a control valve and a controller; the urea nozzle is arranged on the exhaust pipeline and is connected with the controller; the air pipeline is used for communicating the urea nozzle with external air through an air pipeline interface, and the control valve is connected with the controller; the controller is used for acquiring the duration of urea back pumping, controlling the opening and closing of the air pipeline interface and controlling the opening and closing of the spray hole of the urea nozzle according to the duration; after the duration time is longer than or equal to the preset time, the controller controls the control valve to open the air pipeline interface and controls to close the spray hole of the urea nozzle, so that external air is pumped back through the air pipeline for urea pumping back. The invention can avoid the blockage of the urea nozzle or the urea pipeline.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a urea back-pumping system, a urea back-pumping method and a vehicle.
Background
At present, a urea nozzle is required to be used on a national VI Diesel vehicle, and the urea nozzle is used for injecting urea to the front of a Selective Catalytic Reduction (SCR) or an SDPF (SCR and Diesel Particulate Filter (DPF) device).
When the engine is shut down, the urea pump needs to pump the urea solution in the urea nozzle and the urea pipeline to the urea tank, which is called urea back pumping. However, after the engine is shut down, especially when the engine is "hot stopped", hot exhaust gas is drawn back into the urea nozzle and the urea line for a long time (generally 30-60 seconds) as the urea is drawn back, so that the urea is heated and dehydrated to form white urea crystal substances, which may block the urea nozzle or the urea line.
Disclosure of Invention
In view of the above, the present invention is directed to a urea back-pumping system to avoid blockage of the urea nozzle or urea line.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a urea withdrawal system, the system comprising: the device comprises a urea nozzle, an air pipeline, a control valve and a controller; the urea nozzle is arranged on the exhaust pipeline and is connected with the controller; the air pipeline is used for communicating the urea nozzle with external air through an air pipeline interface, and the control valve is connected with the controller; the controller is used for acquiring the duration of urea back pumping, controlling the opening and closing of the air pipeline interface and controlling the opening and closing of the spray hole of the urea nozzle according to the duration; after the duration time is longer than or equal to the preset time, the controller controls the control valve to open the air pipeline interface and controls to close the spray hole of the urea nozzle, so that external air is pumped back through the air pipeline for urea pumping back.
Further, the preset time is less than or equal to 1 second.
Further, the controller is further configured to control to open an orifice of the urea nozzle and control to close the air line interface before the urea pumping duration time does not reach the preset time, so as to perform the urea pumping by pumping back exhaust gas.
Further, the control valve comprises an occluder, at least one sealing ring, a magnetic coil and a spring, wherein the at least one sealing ring is fixed on the occluder and moves integrally with the occluder; when the magnetic coil is powered off, the stopper blocks the air pipeline interface through the at least one sealing ring under the elastic force of the spring so as to close the air pipeline interface; when the magnetic coil is electrified, the stopper is attracted to move, so that the stopper and the at least one sealing ring stop blocking the air pipeline interface, and the air pipeline interface is opened; the controller is used for controlling the magnetic coil to be switched on/off so as to control the air pipeline interface to be opened/closed.
Further, the inner diameter of the air pipeline interface is larger than 2.5 mm.
Further, the system includes an air filter connected to the air line for filtering air entering the air line.
Compared with the prior art, the urea back-pumping system has the following advantages:
the system comprises a urea nozzle, an air pipeline, a control valve and a controller; the urea nozzle is arranged on the exhaust pipeline and is connected with the controller; the air pipeline is used for communicating the urea nozzle with external air through an air pipeline interface, and the control valve is connected with the controller; the controller is used for acquiring the duration of urea back pumping, controlling the opening and closing of the air pipeline interface and controlling the opening and closing of the spray hole of the urea nozzle according to the duration; after the duration time is longer than or equal to the preset time, the controller controls the control valve to open the air pipeline interface and controls to close the spray hole of the urea nozzle, so that external air is pumped back through the air pipeline for urea pumping back. According to the invention, exhaust gas is stopped after the urea is pumped back for the preset time, and external air is used for pumping back, so that the urea in the urea nozzle is completely pumped back within the preset time, high-temperature exhaust gas can be replaced by the external air after the preset time, and the urea can be prevented from crystallizing due to temperature reduction, thereby avoiding the blockage of the urea nozzle or a urea pipeline.
Another objective of the present invention is to provide a urea back-pumping method to avoid the blockage of the urea nozzle or urea line.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a urea pumpback method performed on the basis of a urea nozzle and an air line that communicates the urea nozzle with outside air via an air line interface, the method comprising: obtaining the duration of urea pumpback; and after the duration time is longer than or equal to a preset time, controlling to open the air pipeline interface and close the spray hole of the urea nozzle so as to suck external air back through the air pipeline for urea back-pumping.
Further, the preset time is less than or equal to 1 second.
Further, the method further comprises: and before the urea pumping duration time does not reach the preset time, controlling to open a spray hole of the urea nozzle and close the air pipeline interface so as to pump back the urea through pumping back exhaust gas.
The urea withdrawal method has the same advantages as the urea withdrawal system described above with respect to the prior art, and will not be described herein again.
Another object of the invention is to propose a vehicle to avoid blockage of the urea nozzles or urea lines.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle comprising a urea pumpback system as described above.
The vehicle has the same advantages as the urea withdrawal system described above with respect to the prior art and will not be described in detail here.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of a urea withdrawal system according to an embodiment of the present invention;
FIGS. 2A-2B are schematic diagrams of a urea nozzle according to an embodiment of the present invention;
FIG. 3 is a flow chart of a urea withdrawal process provided by one embodiment of the present invention.
Description of reference numerals:
1 urea nozzle 2 air pipeline
3 controller 4 air pipeline interface
5-jet orifice 6 control valve
11 stopper 12 at least one sealing ring
13 magnetic coil 14 spring
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a block diagram of a urea back-pumping system according to an embodiment of the present invention. As shown in fig. 1, the system comprises a urea nozzle 1, an air pipeline 2, a control valve 6 and a controller 3, wherein the urea nozzle 1 is arranged on an exhaust pipeline and is connected with the controller 3; the air pipeline 2 communicates the urea nozzle 1 with the outside air through an air pipeline interface 4, and the control valve 6 is connected with the controller 3; the controller 3 is configured to obtain a duration of urea back-pumping, and control opening and closing of the air line interface 4 and control opening and closing of an injection hole of the urea nozzle 1 according to the duration; after the duration is greater than or equal to the preset time, the controller 3 controls the control valve 6 to open the air pipeline interface 4 and controls to close the spray hole of the urea nozzle, so that the external air is pumped back through the air pipeline 2 for urea pumping back.
For example, the urea is pumped back to the urea tank from the urea nozzle 1 and the urea pipeline, so as to prevent the urea from blocking the urea nozzle 1 and the urea pipeline due to the formation of crystals after "dehydration" in the urea nozzle 1 and the urea pipeline for a long time (for example, more than 48 hours, but not limited thereto), or prevent the urea from being frozen into a solid state due to too low temperature in winter, and thus the volume of the urea expands to damage the urea nozzle 1 and the urea pipeline.
The controller 3 may be an ECU, or a control unit dedicated to the urea nozzle 1. The invention adds the communicated air pipeline 2 on the urea nozzle 1, the air pipeline 2 is communicated with the outside air, and the temperature of the outside air is far lower than the temperature in the exhaust pipeline (the temperature in the exhaust pipeline can reach 400 ℃). The present invention is configured to control the control valve 6 to open the air line interface 4 and to control to close the nozzle orifice 5 of the urea nozzle 1 (the nozzle orifice 5 may be opened and closed in any existing control manner, including but not limited to, by a control valve identical to the air line interface 4) after the duration of urea withdrawal (which may be timed when urea withdrawal starts, i.e., when the withdrawal pump starts to operate, so as to obtain the duration of urea withdrawal) is obtained, is greater than a preset time (for example, 1 second, or less than 1 second, as calibrated by the time when urea withdrawal is completed in the nozzle), because it is required to withdraw exhaust gas from the nozzle orifice 5 of the urea nozzle 1 to the urea nozzle 1 and the urea line to complete urea withdrawal in the urea nozzle 1 in the preset time, which will be described in detail later. After the urea pumping-back duration is longer than the preset time, the control valve 6 opens the air line interface 4 to allow the external air to enter the urea nozzle 1, and closes the spray hole 5 of the urea nozzle 1 to stop the exhaust gas from entering the urea nozzle 1, so that the external air is used to pump back the urea in the urea line. As the temperature of the external air can only reach about 40 ℃ at most, the urea in the urea pipeline is not dried to cause crystallization.
In addition, although the inner diameter of the air line interface 4 may be set to any possible setting, the embodiment of the present invention preferably sets the inner diameter of the air line interface 4 to be larger than 2.5 mm. Setting the inner diameter larger than 2.5 mm with respect to the inner diameter of a few tenths of a millimeter of the nozzle orifice 5 of the urea nozzle 1 makes it possible to make the air passage capacity better, so that the duration of the urea back-suction is significantly reduced, so that urea crystallization can also be better avoided. It is verified that the time for pumping back urea for 30-60 seconds in the prior art scheme of pumping back exhaust gas by only using the spray holes 5 can be shortened to be within 10 seconds by setting the inner diameter of the air pipeline interface 4 to be larger than 2.5 millimeters and pumping back air by using the air pipeline interface 4.
Furthermore, the system of the embodiment of the present invention may further include an air filter connected to the air pipe 2 for filtering the air entering the air pipe 2, so that the substances that may affect the urea in the air pumped back into the urea nozzle 1 and then entering the urea tank through the urea pipe are filtered out, thereby ensuring that the quality of the urea is not affected.
As described above, according to the present invention, before the duration of the urea back-pumping does not reach the preset time, the controller 3 may control to open the nozzle holes 5 of the urea injection nozzle 1 and control the control valve 6 to close the air line interface 4 to perform the urea back-pumping by back-pumping the exhaust gas. Since the urea nozzle 1 is small, a very short time is sufficient to complete the urea back-pumping in the urea nozzle 1. When the urea in the urea nozzle 1 is pumped back, the air pipeline interface 4 cannot be opened, so that air is prevented from replacing exhaust gas to be pumped back, and the urea in the urea nozzle 1 cannot be pumped back completely.
FIGS. 2A-2B are schematic views of a urea nozzle according to an embodiment of the present invention. As shown in fig. 2A-2B, the control valve 6 further includes: the device comprises an occluder 11, at least one sealing ring, a magnetic coil 13 and a spring 14, wherein the at least one sealing ring is fixed on the occluder 11 and moves integrally with the occluder 11; when the magnetic coil 13 is powered off, the stopper 11 blocks the air line interface 4 through the at least one sealing ring under the elastic force of the spring 14, so that the air line interface 4 is closed; when the magnetic coil 13 is energized, the stopper 11 is attracted to move, so that the stopper 11 and the at least one sealing ring stop closing the air line interface 4, and the air line interface 4 is opened. The controller 3 is used for controlling the magnetic coil 13 to be switched on/off so as to control the air pipeline interface 4 to be opened/closed.
For example, as can be seen more clearly from the schematic structural views of the urea nozzle 1 in fig. 2A-2B, if the urea in the urea nozzle 1 is to be pumped back to be clean, the air must be pumped back from the injection hole 5 of the urea nozzle 1, so the exhaust gas is pumped back, and after the urea in the urea nozzle 1 is pumped back to be clean, the air can be pumped back through the air pipe 2 to clean the urea in the urea pipe.
It can be seen that fig. 2A illustrates a state in which the magnetic coil 13 is de-energized and the air line interface 4 is closed. The stopper 11 blocks the air line connection 4 by means of a sealing ring. If the magnetic coil 13 is energized, the stopper 11 will move with the sealing ring to the right as viewed in the figure, so that the stopper 11 and the sealing ring no longer block the air line connection 4, as shown in fig. 2B.
Although a specific configuration for blocking the air line interface 4 is illustrated in fig. 2A-2B, it should be understood that this configuration is merely preferred and any configuration consistent with the above description (i.e., such as a reduction in the number of seals, etc.) is within the scope of the present invention.
FIG. 3 is a flow chart of a urea withdrawal process provided by one embodiment of the present invention. As shown in fig. 3, the method is performed on the basis of a urea nozzle and an air line that communicates the urea nozzle with outside air through an air line interface, the method comprising:
step S31, obtaining the duration of urea pumping;
and step S32, after the duration time is longer than or equal to a preset time, controlling to open the air pipeline interface and controlling to close the spray hole of the urea nozzle so as to pump the external air back through the air pipeline for urea pumping back.
Further, the preset time is less than or equal to 1 second.
Further, the method further comprises: and before the urea pumping duration time does not reach the preset time, controlling to open a spray hole of the urea nozzle and close the air pipeline interface so as to pump back the urea through pumping back exhaust gas.
A vehicle comprising a urea pumpback system as described above.
The urea withdrawal system and vehicle described above are similar to the embodiment of the urea withdrawal method described above and will not be described in detail herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A urea withdrawal system, the system comprising:
the device comprises a urea nozzle, an air pipeline, a control valve and a controller;
the urea nozzle is arranged on the exhaust pipeline and is connected with the controller;
the air pipeline is used for communicating the urea nozzle with the external air through an air pipeline interface,
the control valve is connected with the controller;
the controller is used for acquiring the duration of urea back pumping, controlling the opening and closing of the air pipeline interface and controlling the opening and closing of the spray hole of the urea nozzle according to the duration; after the duration time is longer than or equal to the preset time, the controller controls the control valve to open the air pipeline interface and controls to close the spray hole of the urea nozzle, so that external air is pumped back through the air pipeline for urea pumping back.
2. The urea pumpback system of claim 1, wherein the predetermined time is less than or equal to 1 second.
3. The urea pumpback system of claim 1, wherein the controller is further configured to control opening of an orifice of the urea injector and closing of the air line interface to perform the urea pumpback by pumpback exhaust gas before the urea pumpback duration has not reached the preset time.
4. The urea withdrawal system of claim 1 or 3,
the control valve comprises a plugging device, at least one sealing ring, a magnetic coil and a spring, wherein the at least one sealing ring is fixed on the plugging device and moves integrally with the plugging device;
when the magnetic coil is powered off, the stopper blocks the air pipeline interface through the at least one sealing ring under the elastic force of the spring so as to close the air pipeline interface;
when the magnetic coil is electrified, the stopper is attracted to move, so that the stopper and the at least one sealing ring stop blocking the air pipeline interface, and the air pipeline interface is opened;
the controller is used for controlling the magnetic coil to be switched on/off so as to control the air pipeline interface to be opened/closed.
5. The urea withdrawal system of claim 1, wherein the air line interface internal diameter is greater than 2.5 millimeters.
6. A urea withdrawal system as set forth in claim 1 further comprising an air filter connected to said air line for filtering air entering said air line.
7. A urea pumpback method performed on the basis of a urea nozzle and an air line that communicates the urea nozzle with outside air via an air line interface, the method comprising:
obtaining the duration of urea pumpback;
and after the duration time is longer than or equal to a preset time, controlling to open the air pipeline interface and close the spray hole of the urea nozzle so as to suck external air back through the air pipeline for urea back-pumping.
8. A urea withdrawal method as claimed in claim 7, wherein the predetermined time is less than or equal to 1 second.
9. The urea withdrawal method of claim 7, further comprising:
and before the urea pumping duration time does not reach the preset time, controlling to open a spray hole of the urea nozzle and close the air pipeline interface so as to pump back the urea through pumping back exhaust gas.
10. A vehicle, characterized in that it comprises a urea withdrawal system as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011003675.3A CN114251160A (en) | 2020-09-22 | 2020-09-22 | Urea back-pumping system, method and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011003675.3A CN114251160A (en) | 2020-09-22 | 2020-09-22 | Urea back-pumping system, method and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN114251160A true CN114251160A (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011003675.3A Pending CN114251160A (en) | 2020-09-22 | 2020-09-22 | Urea back-pumping system, method and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929446A (en) * | 2022-12-23 | 2023-04-07 | 长城汽车股份有限公司 | Urea withdrawal control method, urea withdrawal control device, computer-readable storage medium, and vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2151559A1 (en) * | 2008-08-08 | 2010-02-10 | Magneti Marelli Powertrain S.p.A. | Injection device for injcecting a reducing substance into an exhaust system of an internal combustion engine |
| US20170328252A1 (en) * | 2014-10-27 | 2017-11-16 | Youchun Jin | Device and method for adjusting and controlling actual supplied amount of urea entering an exhaust system |
| CN208057203U (en) * | 2018-03-16 | 2018-11-06 | 潍柴动力股份有限公司 | Urea injection system and its urea emptying apparatus |
| CN210858878U (en) * | 2019-08-08 | 2020-06-26 | 无锡恒和环保科技有限公司 | Gas-assisted urea injection metering device for SCR system |
-
2020
- 2020-09-22 CN CN202011003675.3A patent/CN114251160A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2151559A1 (en) * | 2008-08-08 | 2010-02-10 | Magneti Marelli Powertrain S.p.A. | Injection device for injcecting a reducing substance into an exhaust system of an internal combustion engine |
| US20170328252A1 (en) * | 2014-10-27 | 2017-11-16 | Youchun Jin | Device and method for adjusting and controlling actual supplied amount of urea entering an exhaust system |
| CN208057203U (en) * | 2018-03-16 | 2018-11-06 | 潍柴动力股份有限公司 | Urea injection system and its urea emptying apparatus |
| CN210858878U (en) * | 2019-08-08 | 2020-06-26 | 无锡恒和环保科技有限公司 | Gas-assisted urea injection metering device for SCR system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929446A (en) * | 2022-12-23 | 2023-04-07 | 长城汽车股份有限公司 | Urea withdrawal control method, urea withdrawal control device, computer-readable storage medium, and vehicle |
| CN115929446B (en) * | 2022-12-23 | 2024-08-20 | 长城汽车股份有限公司 | Urea back-pumping control method, urea back-pumping control device, computer readable storage medium and vehicle |
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