CN112648052B - Urea tank pressure maintaining control system and maintenance method thereof - Google Patents
Urea tank pressure maintaining control system and maintenance method thereof Download PDFInfo
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- CN112648052B CN112648052B CN202011560978.5A CN202011560978A CN112648052B CN 112648052 B CN112648052 B CN 112648052B CN 202011560978 A CN202011560978 A CN 202011560978A CN 112648052 B CN112648052 B CN 112648052B
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- air
- urea tank
- control system
- pressure maintaining
- compressed air
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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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
- F01N3/24—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
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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
- F01N3/24—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
- F01N3/30—Arrangements for supply of additional air
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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
- F01N3/24—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
- F01N3/30—Arrangements for supply of additional air
- F01N3/303—Filtering additional air
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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
- 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
Abstract
The invention belongs to the technical field of automobile chassis, and particularly relates to a urea tank pressure maintaining control system and a maintenance method thereof. The air processing unit is used for drying the compressed air; the three-way valve comprises a first interface, a second interface and an exhaust port, the first interface is communicated with the air processing unit, and the exhaust port is communicated with the atmosphere; the gas filter comprises an input end and an output end, the input end is communicated with the second interface, and the urea tank is communicated with the output end; when the urea tank is decompressed and exhausted, compressed air is exhausted from the exhaust port through the air filter. The urea tank pressure maintaining control system has the advantages of few valve parts, simple system pipeline, few failure risk points, simple system maintenance and low maintenance cost; according to the maintenance method of the urea tank pressure maintaining control system, when the urea tank is decompressed and exhausted, the gas filter is subjected to back-blowing cleaning through compressed air, the gas filter is prevented from being blocked by dust, and the automobile maintenance mileage is prolonged.
Description
Technical Field
The invention relates to the technical field of automobile chassis, in particular to a urea tank pressure maintaining control system and a maintenance method thereof.
Background
Among the current automobile chassis structure, a urea tank pressurize control system structure for exhaust-gas purification is comparatively complicated: the compressed air dried by the air treatment unit enters the air filter, and the compressed air filtered by the air filter enters the urea tank through the control valve to establish working pressure for the urea tank. When the urea tank finishes urea injection and carries out pressure relief and exhaust, compressed gas in the urea tank is exhausted through the other control valve. In the existing design, when a gas filter cleans compressed air, the gas filter is easily blocked by dust, so that the maintenance mileage of an automobile is short; and the urea tank pressure maintaining control system has complex pipelines, more valve parts, more electrical connectors and air circuit connectors, complex assembly, more failure risk points, troublesome system maintenance and high maintenance cost.
Disclosure of Invention
The invention aims to provide a urea tank pressure maintaining control system which has the advantages of few valve parts, simple system pipeline, few failure risk points, convenient system maintenance and low maintenance cost; meanwhile, a maintenance method of the urea tank pressure maintaining control system is provided, so that the gas filter can be prevented from being blocked by dust, and the maintenance mileage of an automobile can be prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, a urea tank pressure maintaining control system is provided, comprising:
an air handling unit for drying compressed air;
the three-way valve comprises a first interface, a second interface and an exhaust port, the first interface is communicated with the air processing unit, and the exhaust port is communicated with the atmosphere;
the gas filter comprises an input end and an output end, and the input end is communicated with the second interface; and
the urea tank is communicated with the output end; when the urea tank is decompressed and exhausted, compressed air is exhausted from the exhaust port through the air filter.
As a preferable structure of the present invention, the exhaust port is a one-way port.
As a preferable structure of the invention, the air treatment device further comprises a first air conveying pipe, one end of the first air conveying pipe is connected with the air outlet of the air treatment unit, and the other end of the first air conveying pipe is connected with the first interface.
As a preferable structure of the present invention, the air conditioner further comprises a second air pipe, one end of the second air pipe is connected to the second interface, and the other end of the second air pipe is connected to the input end.
As a preferable structure of the invention, the device also comprises a third air conveying pipe, one end of the third air conveying pipe is connected with the output end, and the other end of the third air conveying pipe is connected with the air inlet of the urea tank.
As a preferable structure of the present invention, the three-way valve further includes an electrical connection port for connecting an external circuit, and the electrical connection port is configured to control the first port, the second port, and the opening and closing of the exhaust port.
In a preferred configuration of the present invention, the urea tank further includes a pressure holding device provided in the urea tank, the pressure holding device being configured to hold a pressure in the urea tank.
In another aspect, a method for maintaining a urea tank pressure maintaining control system is provided, which includes the following steps:
step S1, drying the compressed air by the air processing unit, wherein the compressed air enters the air filter from the input end of the air filter through the first air pipe, the three-way valve and the second air pipe;
step S2, the gas filter cleans the compressed air, the cleaned compressed air is output from the output end of the gas filter and enters a pressure maintaining device in the urea tank through a third gas transmission pipe, and the pressure maintaining device in the urea tank builds working pressure;
step S3, completing pressure building of the pressure maintaining device, starting pressure maintaining, and spraying urea by the urea tank;
step S4, compressed air is discharged from the pressure maintaining device in the urea tank, passes through the third air conveying pipe, enters the air filter from the output end of the air filter, and is subjected to back-blowing cleaning to clean dust in the air filter;
and step S5, discharging the compressed air with dust from the input end in the air filter, and discharging the compressed air into the atmosphere through the second air delivery pipe and the exhaust port of the three-way valve.
As a preferred structure of the present invention, before step S1, the method further includes closing the exhaust port through the power connection port, and opening the first port and the second port.
As a preferred structure of the present invention, before step S5, the method further includes closing the first port of the three-way valve through the power connection port, and opening the exhaust port.
The invention has the beneficial effects that: the urea tank pressure maintaining control system provided by the invention is connected with the air treatment unit and the gas filter through the three-way valve, when pressure building and maintaining are carried out on the urea tank, compressed air dried by the air treatment unit enters the gas filter through the three-way valve, is cleaned by the gas filter and finally enters the urea tank; when the urea tank is decompressed and exhausted, compressed air reversely blows the gas filter to take away dust in the gas filter, and the dust is exhausted to the atmosphere through the three-way valve; the pressure building and releasing processes of the urea tank pressure maintaining control system can be realized through a three-way valve, the number of valve parts is small, the system pipeline is simple, the failure risk points are few, the system maintenance is convenient, and the maintenance cost is low; according to the maintenance method of the urea tank pressure maintaining control system, the gas filter is subjected to back-blowing cleaning through compressed air when the urea tank is subjected to pressure relief and exhaust, so that the gas filter is prevented from being blocked by dust, and the maintenance mileage of an automobile is prolonged.
Drawings
Fig. 1 is a schematic diagram of a urea tank pressure maintaining control system according to an embodiment of the present invention.
In the figure:
1. an air handling unit; 11. an air outlet;
2. a three-way valve; 21. a first interface; 22. a second interface; 23. an exhaust port; 24. an electric connection port;
3. a gas filter; 31. an input end; 32. an output end;
4. a urea tank; 41. an air inlet;
5. a first gas delivery pipe;
6. a second gas delivery pipe;
7. a third air delivery conduit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1, an embodiment of the present invention provides a urea tank pressure maintaining control system, which includes an air processing unit 1, a three-way valve 2, an air filter 3, and a urea tank 4. The air handling unit 1 serves for drying compressed air. The three-way valve 2 comprises a first port 21, a second port 22 and an exhaust port 23, wherein the first port 21 is communicated with the air processing unit 1, and the exhaust port 23 is communicated with the atmosphere. Preferably, the exhaust port 23 is a one-way port, which ensures that the atmosphere does not enter the urea tank pressure maintaining control system through the exhaust port 23, and avoids pollution from the atmosphere. The gas filter 3 comprises an input 31 and an output 32, the input 31 being in communication with the second port 22. The gas filter 3 is used for cleaning the compressed air dried by the air processing unit 1, and in the working process of the gas filter 3, dust carried by the compressed air can be left in the gas filter 3, so that the gas filter 3 is easily blocked. The urea tank 4 is communicated with the output end 32 of the gas filter 3; the compressed air cleaned by the gas filter 3 enters the urea tank 4 through the output end 32 to provide working pressure for the urea tank 4. When the urea tank 4 is depressurized and exhausted, the compressed air is discharged from the exhaust port 23 of the three-way valve 2 through the air cleaner 3, and enters the atmosphere. When the compressed air passes through the gas filter 3, the gas filter 3 is back-blown clean, and dust in the gas filter 3 is cleaned and discharged from the exhaust port 23 of the three-way valve 2. This urea jar pressurize control system replaces two control valves in the current structure through three-way valve 2, and urea jar 4 only connects the gas port to realize admitting air and build pressure and pressure release exhaust through one, and the system pipeline is simple, and the risk point that becomes invalid is few, and the system maintenance is convenient and the maintenance cost is low. The urea tank 4 can perform back-blowing cleaning on the gas filter 3 through compressed air while releasing pressure and exhausting air, so that the gas filter 3 is prevented from being blocked by dust, and the maintenance mileage of the automobile is prolonged; the gas filter 3 is cleaned and maintained while the pressure is released and the gas is exhausted, the operation is simple, and an additional cleaning and maintaining device is not needed.
Further, urea jar pressurize control system still includes first gas-supply pipe 5, second gas-supply pipe 6 and third gas-supply pipe 7, and the gas outlet 11 of air handling unit 1 is connected to the one end of first gas-supply pipe 5, and the other end is connected with the first interface 21 of three-way valve 2. One end of the second gas pipe 6 is connected with the second interface 22 of the three-way valve 2, and the other end is connected with the input end 31 of the gas filter 3. One end of the third air delivery pipe 7 is connected with the output end 32 of the filter 3, and the other end is connected with the air inlet 41 of the urea tank 4. The three air path pipelines are used for realizing smooth flowing of compressed air, and the urea tank pressure maintaining control system is suitable for the limited and complex space environment in the automobile chassis by adjusting the respective lengths and angles of the first air delivery pipe 5, the second air delivery pipe 6 and the third air delivery pipe 7.
Further, the three-way valve 2 further includes an electrical interface 24, the electrical interface 24 is used for connecting an external circuit, and the electrical interface 24 is configured to control the first interface 21, the second interface 22 and the exhaust port 23 to open and close, so as to meet two different working requirements of air intake pressure building and pressure relief exhaust of the urea tank 4.
Further, the urea tank pressure maintaining control system further includes a pressure maintaining device and a pressure reducing valve (not shown in the figure), the pressure maintaining device is disposed in the urea tank 4, and the pressure maintaining device is configured to maintain the pressure in the urea tank 4, so that the urea injection flow rate in the urea tank 4 is more uniform. The pressure reducing valve is connected with the air filter 3, and the pressure reducing valve is configured to stabilize the pressure of the compressed air after passing through the air filter 3, so that the pressure of the compressed air is prevented from being too high, and the pressurizer in the urea tank 4 is prevented from being damaged.
Example two
The embodiment of the invention provides a maintenance method for a urea tank pressure maintaining control system, which comprises the following steps:
step S1, the air processing unit 1 dries the compressed air, and the compressed air enters the air filter 3 from the input end 31 of the air filter 3 through the first air pipe 5, the three-way valve 2 and the second air pipe 6;
further, before step S1, the method further includes closing the exhaust port 23 through the power port 24 and opening the first port 21 and the second port 22. At this time, the first port 21 and the second port 22 of the three-way valve 2 are communicated, and the compressed air dried by the air processing unit 1 enters from the first port 21 of the three-way valve 2 and is output from the second port 22.
Step S2, the gas filter 3 cleans the compressed air, the cleaned compressed air is output from the output end 32 of the gas filter 3 and enters the pressure maintaining device in the urea tank 4 through the third gas transmission pipe 7, and the pressure maintaining device in the urea tank 4 establishes working pressure;
in this step, the gas filter 3 traps dust in the pipeline, and dust carried by the compressed air can be left in the gas filter 3, which easily causes blockage of the gas filter 3; clean compressed air enters the pressurizer in the urea tank 4 through the air inlet 41 and starts to build up working pressure.
Step S3, completing pressure building of the pressure maintaining device, maintaining pressure, and spraying urea to the urea tank 4;
in this step, the pressure maintaining device provides injection power for the urea tank 4 to inject urea.
Step S4, discharging compressed air from a pressure maintaining device in the urea tank 4, passing through a third air conveying pipe 7, entering the air filter 3 from the output end 32 of the air filter 3, and performing back-blowing cleaning on the air filter 3 by the compressed air to clean dust in the air filter 3;
in this step, the compressed air is discharged through the air inlet 41 of the urea tank 4, and when passing through the gas filter 3, the compressed air performs back-blow cleaning of the gas filter 3, thereby cleaning dust in the gas filter 3 and maintaining the urea tank pressure maintaining control system.
In step S5, the compressed air with dust is discharged from the input end 31 in the air cleaner 3, and is discharged to the atmosphere through the second air pipe 6 and the exhaust port 23 of the three-way valve 2.
Further, before this step, the method further comprises closing the first port 21 of the three-way valve 2 through the electric port 24 and opening the exhaust port 23. At this time, the second port 22 is communicated with the exhaust port 23, and the compressed air with dust is exhausted from the exhaust port 23 to the atmosphere through the second port 22 of the three-way valve 2, so that the cleaning and maintenance of the urea tank pressure maintaining control system are completed.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A urea tank pressure maintaining control system, comprising:
an air handling unit (1), the air handling unit (1) being for drying compressed air;
a three-way valve (2), wherein the three-way valve (2) comprises a first interface (21), a second interface (22) and an exhaust port (23), the first interface (21) is communicated with the air processing unit (1), and the exhaust port (23) is communicated with the atmosphere;
the gas filter (3), the gas filter (3) comprises an input end (31) and an output end (32), and the input end (31) is communicated with the second interface (22); and
the urea tank (4), the urea tank (4) is communicated with the output end (32); when the urea tank (4) is decompressed and exhausted, compressed air passes through the air filter (3) and is exhausted from the exhaust port (23).
2. A urea tank dwell control system according to claim 1, where the exhaust port (23) is a one-way port.
3. The urea tank pressure maintaining control system according to claim 1, further comprising a first air pipe (5), wherein one end of the first air pipe (5) is connected with the air outlet (11) of the air processing unit (1), and the other end of the first air pipe is connected with the first interface (21).
4. The urea tank pressure maintaining control system according to claim 1, further comprising a second gas pipe (6), wherein one end of the second gas pipe (6) is connected to the second interface (22), and the other end is connected to the input end (31).
5. The urea tank pressure maintaining control system according to claim 1, further comprising a third air conveying pipe (7), wherein one end of the third air conveying pipe (7) is connected with the output end (32), and the other end of the third air conveying pipe is connected with an air inlet (41) of the urea tank (4).
6. A urea tank dwell control system according to claim 1, wherein the three-way valve (2) further comprises an electrical port (24), the electrical port (24) being for connection to an external circuit, the electrical port (24) being configured to control the switching of the first interface (21), the second interface (22) and the exhaust port (23).
7. A urea tank dwell control system according to any one of claims 1-6, further comprising a dwell device arranged in the urea tank (4), the dwell device being configured to maintain the pressure in the urea tank (4).
8. A maintenance method of a urea tank pressure maintaining control system is characterized by comprising the following steps:
step S1, drying compressed air by the air processing unit (1), wherein the compressed air enters the air filter (3) from the input end (31) of the air filter (3) through the first air pipe (5), the three-way valve (2) and the second air pipe (6);
step S2, the gas filter (3) cleans compressed air, the cleaned compressed air is output from an output end (32) of the gas filter (3) and enters a pressure maintaining device in the urea tank (4) through a third gas conveying pipe (7), and the pressure maintaining device in the urea tank (4) establishes working pressure;
step S3, completing pressure building of the pressure maintaining device, starting pressure maintaining, and spraying urea into the urea tank (4);
step S4, discharging compressed air from the pressure maintaining device in the urea tank (4), passing through the third air conveying pipe (7), entering the air filter (3) from the output end (32) of the air filter (3), and performing back-blowing cleaning on the air filter (3) by the compressed air to clean dust in the air filter (3);
and step S5, discharging the compressed air with dust from the input end (31) in the air filter (3), and discharging the compressed air into the atmosphere from the exhaust port (23) of the three-way valve (2) through the second air conveying pipe (6).
9. A urea tank dwell control system maintenance method according to claim 8, characterized by, before step S1, further comprising closing the exhaust port (23) by means of an electrical port (24), opening the first port (21) of the three-way valve (2) and the second port (22) of the three-way valve (2).
10. A urea tank dwell control system maintenance method according to claim 8, characterized by, before step S5, further comprising closing the first port (21) of the three-way valve (2) and opening the exhaust port (23) through an electrical port (24).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011560978.5A CN112648052B (en) | 2020-12-25 | 2020-12-25 | Urea tank pressure maintaining control system and maintenance method thereof |
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| CN202011560978.5A CN112648052B (en) | 2020-12-25 | 2020-12-25 | Urea tank pressure maintaining control system and maintenance method thereof |
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