CN114607494A - Method and device for monitoring faults of heating electromagnetic valve of urea box - Google Patents
Method and device for monitoring faults of heating electromagnetic valve of urea box Download PDFInfo
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- CN114607494A CN114607494A CN202210207493.0A CN202210207493A CN114607494A CN 114607494 A CN114607494 A CN 114607494A CN 202210207493 A CN202210207493 A CN 202210207493A CN 114607494 A CN114607494 A CN 114607494A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 103
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 239000004202 carbamide Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 230000002159 abnormal effect Effects 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000013024 troubleshooting Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/22—Monitoring or diagnosing the deterioration of exhaust systems of electric heaters for exhaust systems or their power supply
-
- 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
- F01N2610/1486—Means to prevent the substance from freezing
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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 the technical field of automobile urea, in particular to a method and a device for monitoring faults of a heating electromagnetic valve of a urea box, wherein a detection device is used for detecting the pressure value in a downstream pipeline of the heating electromagnetic valve in real time, judging whether the pressure value is greater than a first threshold value after closing the heating electromagnetic valve for a first preset time, if so, judging that the heating electromagnetic valve is in an abnormal opening fault, judging whether the pressure value is smaller than a second threshold value after opening the heating electromagnetic valve for a second preset time, if so, judging that the heating electromagnetic valve is in an abnormal closing fault, therefore, when the heating solenoid valve breaks down among the above-mentioned part, the staff can be fast accurate discovery trouble and guide troubleshooting, further make the inside urea solution of urea case not have the overtemperature risk, guarantee that automobile-used urea solution can not take place because overtemperature leads to the problem of rotting.
Description
Technical Field
The invention relates to the technical field of automobile urea, in particular to a method and a device for monitoring faults of a heating electromagnetic valve of a urea box.
Background
The automobile urea solution can be frozen at-11 ℃, in order to ensure that the urea injection system can normally work when the environmental temperature is lower than-11 ℃, urea in a urea box needs to be heated and thawed, but in reality, the urea box is frequently abnormal and is continuously heated by engine cooling liquid, so that the urea temperature is overhigh in the running process of the whole automobile, and the main reasons of the fault are caused: on one hand, the urea box is continuously heated because the cooling water inlet pipe and the cooling water outlet pipe of the urea box heating electromagnetic valve indicate opposite flow directions with the urea box heating electromagnetic valve to cause the electromagnetic valve to be normally opened; on the other hand is that there is particulate matter impurity to lead to urea case heating solenoid valve jamming to be normally opened in the engine coolant liquid, leads to urea case abnormal heating, consequently for solving above-mentioned problem, prior art is through increasing urea case temperature sensor for judge whether the temperature exceeds the temperature that urea allows, and then be used for the control to urea case heating solenoid valve trouble, still have following technical problem:
1. when more residual urea is left in a urea box in the prior art, the time for heating the urea to the alarm temperature is too long, the water temperature of an engine rises slowly when the load rate of the engine is low, and the temperature rise of the urea is slower, so that the fault reporting is delayed greatly, and the fault reporting cannot be timely and quickly reported when a heating electromagnetic valve of the urea box fails, so that the maintenance is prompted;
2. the urea solution for the vehicle can generate decomposition reaction at high temperature, and the urea solution concentration can be reduced and the urea can not reach the standard by judging the overtemperature of the urea.
Disclosure of Invention
The invention discloses a method and a device for monitoring faults of a heating electromagnetic valve of a urea box, which are used for shortening the fault repair time of the urea heating valve and improving the fault detection accuracy.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a method for monitoring a fault of a heating solenoid valve of a urea tank, comprising:
detecting the pressure value in the downstream pipeline of the heating electromagnetic valve in real time through a detection device;
judging whether the pressure value is greater than a first threshold value or not after closing the heating electromagnetic valve for a first preset time, and if the pressure value is greater than the first threshold value, judging that the heating electromagnetic valve is in an abnormal opening fault;
and judging whether the pressure value is smaller than a second threshold value after opening the heating electromagnetic valve for a second preset time, and if the pressure value is smaller than the second threshold value, judging that the heating electromagnetic valve is in an abnormal closing fault.
Therefore, including the detection device who is used for detecting heating solenoid valve low reaches pipeline in above-mentioned part to make heating solenoid valve under the state of opening or closing, detection device can real-time detection heating solenoid valve low reaches pipeline's the inside pressure value, compares through the pressure value that detects again with first threshold value or second threshold value, can swiftly effectually obtain whether the condition of breaking down of heating solenoid valve. Therefore, the control state of the heating electromagnetic valve can be combined to monitor whether the heating electromagnetic valve of the urea box breaks down or not in real time, when the heating electromagnetic valve breaks down, a worker can quickly and accurately find the fault and guide the troubleshooting, the urea solution in the urea box is further free of over-temperature risk, and the problem that the vehicle urea solution is deteriorated due to over-temperature is solved.
Optionally, the second threshold has an early warning threshold and a fault reporting threshold, the detection device is in signal connection with an early warning unit, when the pressure value reaches the early warning threshold of the first threshold, the early warning unit sends out early warning information, and when the pressure value reaches the fault reporting threshold of the first threshold, the early warning unit sends out fault reporting information.
Optionally, the first threshold is in the range of 1-1.5 atmospheres.
Optionally, the second threshold is in the range of 2-4 atmospheres.
Optionally, the failure reporting threshold of the second threshold ranges from 2 to 3 atmospheres.
Optionally, the early warning threshold range of the second threshold is 3 to 4 atmospheres.
Optionally, the first preset time is 10-30 s.
Optionally, the second preset time is 10-20 s.
Optionally, the detecting, by the detecting device, a pressure value in the pipeline downstream of the heating solenoid valve includes:
and detecting the pressure value in the downstream pipeline of the heating electromagnetic valve through a pressure sensor.
In a second aspect, the invention provides a device for monitoring faults of a heating electromagnetic valve of a urea box, which comprises an engine, the urea box and a liquid guide pipe;
the engine comprises a water inlet end and a water outlet end;
the liquid guide pipe comprises a first main liquid guide pipe, a second main liquid guide pipe and a secondary liquid guide pipe;
the auxiliary liquid guide pipe is used for connecting the first main liquid guide pipe and the second main liquid guide pipe, the first main liquid guide pipe is connected with the water outlet end of the engine, the second main liquid guide pipe is connected with the water inlet end of the engine, and the auxiliary liquid guide pipe is arranged in the urea box and used for heating urea in the urea box;
the first main liquid guide pipe is provided with a heating electromagnetic valve and a pressure sensor, and the pressure sensor is positioned at the downstream of the heating electromagnetic valve.
Drawings
FIG. 1 is a schematic flow chart of a method for monitoring faults of a heating solenoid valve of a urea tank according to an embodiment of the invention;
FIG. 2 is a schematic flow chart illustrating a method for monitoring faults of a heating solenoid valve of a urea tank according to an embodiment of the invention;
fig. 3 is a schematic view of the overall structure of the present invention.
In the figure: the system comprises an engine 1, a heating electromagnetic valve 2, a pressure sensor 3, a first main liquid guide pipe 4, an auxiliary liquid guide pipe 5, a urea box 6, a second main liquid guide pipe 7 and an early warning unit 8.
Detailed Description
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.
In a first aspect, as shown in fig. 1 to 3, the present invention provides a method for monitoring a failure of a heating solenoid valve of a urea tank, including:
s101, detecting the pressure value in the downstream pipeline of the heating electromagnetic valve 2 in real time through a detection device, and detecting whether the heating electromagnetic valve 2 breaks down or not in each time period according to the pressure value change of the downstream pipeline of the heating electromagnetic valve 2.
S102, judging whether the pressure value is larger than a first threshold value or not after closing the heating electromagnetic valve 2 for a first preset time, if so, judging that the heating electromagnetic valve 2 is in abnormal opening fault, and if not, judging that the heating electromagnetic valve 2 is in abnormal opening fault.
And S103, judging whether the pressure value is smaller than a second threshold value after the heating electromagnetic valve 2 is opened for a second preset time, if so, judging that the heating electromagnetic valve 2 is in abnormal closing fault, and if so, judging that the heating electromagnetic valve 2 is in abnormal closing fault.
Therefore, including the detection device who is used for detecting 2 low reaches pipelines of heating solenoid valve in above-mentioned part to make heating solenoid valve 2 under the state of opening or closing, detection device can real-time detection heating solenoid valve 2 low reaches pipeline's inside pressure value, compares through the pressure value that detects again with first threshold value or second threshold value, can swiftly effectual the condition of whether appearing the trouble of reacing heating solenoid valve 2. Therefore, the invention can monitor whether the heating electromagnetic valve 2 breaks down or not in real time by combining the control state of the heating electromagnetic valve 2, when the heating electromagnetic valve 2 breaks down, a worker can quickly and accurately find the fault and guide the troubleshooting, further the urea solution in the urea box 6 has no overtemperature risk, and the problem of deterioration of the vehicle urea solution caused by overtemperature is ensured not to occur.
The second threshold value has an early warning threshold value and a fault reporting threshold value, the detection device is in signal connection with an early warning unit 8, when the pressure value reaches the early warning threshold value of the first threshold value, the early warning unit 8 sends out early warning information, and when the pressure value reaches the fault reporting threshold value of the first threshold value, the early warning unit 8 sends out fault reporting information.
Consequently there is early warning unit 8 at detection device in above-mentioned part signal connection, therefore can be under early warning unit 8's effect, when heating solenoid valve 2 breaks down, early warning unit 8 can be quick according to the signal of detection device feedback, judges by oneself and sends early warning information or report trouble information, and further messenger's staff can be directly effectual according to the information that early warning unit 8 feedbacks, decides whether to carry out maintenance work on next step to heating solenoid valve 2.
In one embodiment, the first threshold is in the range of 1-1.5 atmospheres, for example the first threshold is: 1.0 atmosphere, 1.1 atmosphere, 1.2 atmospheres, 1.3 atmospheres, 1.4 atmospheres, or 1.5 atmospheres.
In one embodiment, the range of the second threshold is 2-4 atmospheres, and the invention adopts intuitive and stable threshold range data as compared data, so that when the pressure values of the downstream pipeline of the heating electromagnetic valve 2 in different states are responded, the comparison can be directly carried out with the compared data, and the diagnostic data of the heating electromagnetic valve 2 can be quickly obtained.
In one embodiment, the failure threshold of the second threshold is in the range of 2-3 atmospheres. For example, the warning threshold of the second threshold is: 2.0 atmospheres, 2.2 atmospheres, 2.4 atmospheres, 2.6 atmospheres, 2.8 atmospheres, or 3.0 atmospheres.
In one embodiment, the warning threshold of the second threshold is in a range of 3-4 atmospheres, for example, the failure threshold of the second threshold is: 3.0 atmospheres, 3.2 atmospheres, 3.4 atmospheres, 3.6 atmospheres, 3.8 atmospheres, or 4.0 atmospheres.
In one embodiment, the first predetermined time is 10-30s, for example: 10s, 15s, 20s, 25s or 30 s.
In one embodiment, the second predetermined time is 10-20s, for example: 10s, 15s or 20s, the time for monitoring the data adopts a time range of 10-30s when the data is compared, for example: the temperature sensor is used for detecting the temperature rising rate of the urea box 6 to judge whether the heating electromagnetic valve 2 breaks down or not, the temperature rising process is long, so that the detection process time is far longer than 30s, diagnostic data of the heating electromagnetic valve 2 can be fed back to workers rapidly, and the loss of urea in the urea box 6 is avoided.
In one embodiment, the detection of the pressure value in the pipeline downstream of the heating solenoid valve 2 by the detection device comprises:
the pressure sensor 3 is used for detecting the pressure value in the downstream pipeline of the heating electromagnetic valve 2, and the pressure sensor 3 is adopted, so that compared with the existing temperature sensor, the detection device provided by the invention has the advantages that the cost of the pressure sensor 3 is lower, and the detection data is simpler and quicker.
In order to make the solution provided by the embodiment of the present invention easier to understand, the exit thermal management control process provided by the embodiment of the present invention is described in detail below by a specific embodiment, as shown in fig. 2, the process includes the following steps:
s201, starting the engine 1 to operate, and heating the vehicle-mounted urea box 6;
s202, judging whether the heating electromagnetic valve 2 is in a closed state, if so, executing S203; otherwise, S205 is executed;
s203, judging whether the pressure value of the downstream pipeline of the heating electromagnetic valve 2 detected by the pressure sensor 3 is larger than a first threshold value, if so, executing S204; otherwise, executing S207;
s204, judging that the heating electromagnetic valve 2 is in an abnormal opening fault;
s205, judging whether the pressure value of the downstream pipeline of the heating electromagnetic valve 2 detected by the pressure sensor 3 is smaller than a second threshold value, if so, executing S206; otherwise, executing S207;
s206, judging that the heating electromagnetic valve 2 is in an abnormal closing fault;
and S207, finishing the detection process.
In a second aspect, the invention provides a device for monitoring faults of a heating electromagnetic valve of a urea box, which comprises an engine 1, the urea box 6 and a liquid guide pipe;
the engine 1 comprises a water inlet end and a water outlet end;
the liquid guide pipe comprises a first main liquid guide pipe 4, a second main liquid guide pipe 7 and a secondary liquid guide pipe 5;
the auxiliary liquid guide pipe 5 is used for connecting the first main liquid guide pipe 4 and the second main liquid guide pipe 7, the first main liquid guide pipe 4 is connected with the water outlet end of the engine 1, the second main liquid guide pipe 7 is connected with the water inlet end of the engine 1, and the auxiliary liquid guide pipe 5 is arranged inside the urea box 6 and used for heating urea inside the urea box 6;
the first main liquid guide pipe 4 is provided with a heating electromagnetic valve 2 and a pressure sensor 3, and the pressure sensor 3 is positioned at the downstream of the heating electromagnetic valve 2.
In one embodiment, the specific implementation process of the present invention is as follows:
when urea in the urea box 6 needs to be heated, the heating electromagnetic valve 2 is opened, high-temperature liquid transmitted from the water outlet end of the engine 1 enters the inside of the auxiliary liquid guide pipe 5 through the first main liquid guide pipe 4, at the moment, the auxiliary liquid guide pipe 5 is used for heating urea in the urea box 6, and then the liquid flows into the inside of the second main liquid guide pipe 7 and finally enters the inside of the engine 1 through the water inlet end of the engine 1.
In the above process, for example: when the heating solenoid valve 2 is in a closed state, after a first preset time, if the pressure value inside the first main liquid guide pipe 4 measured by the pressure sensor 3 is greater than a first threshold value, the abnormal opening fault of the heating solenoid valve 2 is reported through the early warning unit 8, and if the pressure value is less than the first threshold value, the abnormal opening fault of the heating solenoid valve 2 is determined.
When the urea box 6 is in an open state, after a second preset time, if the detected pressure value is greater than a first threshold value, it is determined that the heating solenoid valve 2 is in abnormal closing fault, if the pressure value inside the first main liquid guide pipe 4 measured by the pressure sensor 3 is less than a second threshold value, further determination is performed, when the pressure value is 3-4 atmospheres, early warning information is sent out through the early warning unit 8, and when the pressure value is 2-3 atmospheres, fault reporting information is sent out through the early warning unit 8, so that a worker can obtain that the heating solenoid valve 2 is in abnormal closing fault through the early warning unit 8.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method for monitoring faults of a heating electromagnetic valve of a urea box is characterized by comprising the following steps:
detecting the pressure value in the downstream pipeline of the heating electromagnetic valve in real time through a detection device;
judging whether the pressure value is greater than a first threshold value or not after closing the heating electromagnetic valve for a first preset time, and if the pressure value is greater than the first threshold value, judging that the heating electromagnetic valve is in an abnormal opening fault;
and judging whether the pressure value is smaller than a second threshold value after opening the heating electromagnetic valve for a second preset time, and if the pressure value is smaller than the second threshold value, judging that the heating electromagnetic valve is in an abnormal closing fault.
2. The method for monitoring the faults of the heating electromagnetic valve of the urea box as claimed in claim 1, wherein the second threshold value is provided with an early warning threshold value and a fault reporting threshold value, the detection device is in signal connection with an early warning unit, the early warning unit sends out early warning information when the pressure value reaches the early warning threshold value of the first threshold value, and the early warning unit sends out fault reporting information when the pressure value reaches the fault reporting threshold value of the first threshold value.
3. The method of monitoring a urea tank heating solenoid valve for faults as claimed in claim 1, wherein said first threshold is in the range of 1-1.5 atmospheres.
4. The method of monitoring for a fault in a urea tank heating solenoid valve of claim 1, wherein the second threshold is in the range of 2-4 atmospheres.
5. The method of monitoring a urea tank heating solenoid valve for a fault as recited in claim 2, wherein the fault threshold for the second threshold is in the range of 2-3 atmospheres.
6. The method of monitoring the failure of the urea tank heating solenoid valve as recited in claim 2, wherein the pre-warning threshold of the second threshold is in the range of 3-4 atmospheres.
7. The method of monitoring a urea tank heating solenoid valve for a fault as recited in claim 2, wherein the first predetermined time is 10-30 seconds.
8. The method of monitoring a urea tank heating solenoid valve for a fault as recited in claim 2, wherein said second predetermined time is 10-20 seconds.
9. The method for monitoring the fault of the heating solenoid valve of the urea box according to claim 1, wherein the step of detecting the pressure value in the pipeline downstream of the heating solenoid valve through the detection device comprises the following steps:
and detecting the pressure value in the downstream pipeline of the heating electromagnetic valve through a pressure sensor.
10. A device for monitoring faults of a heating electromagnetic valve of a urea box is characterized by comprising an engine, the urea box and a liquid guide pipe;
the engine comprises a water inlet end and a water outlet end;
the liquid guide pipe comprises a first main liquid guide pipe, a second main liquid guide pipe and a secondary liquid guide pipe;
the auxiliary liquid guide pipe is used for connecting the first main liquid guide pipe and the second main liquid guide pipe, the first main liquid guide pipe is connected with the water outlet end of the engine, the second main liquid guide pipe is connected with the water inlet end of the engine, and the auxiliary liquid guide pipe is arranged in the urea box and used for heating urea in the urea box;
the first main liquid guide pipe is provided with a heating electromagnetic valve and a pressure sensor, and the pressure sensor is positioned at the downstream of the heating electromagnetic valve.
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| CN202210207493.0A CN114607494A (en) | 2022-03-04 | 2022-03-04 | Method and device for monitoring faults of heating electromagnetic valve of urea box |
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