CN115075928A - Method for improving urea injection system diagnosis robustness - Google Patents
Method for improving urea injection system diagnosis robustness Download PDFInfo
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- CN115075928A CN115075928A CN202210854353.2A CN202210854353A CN115075928A CN 115075928 A CN115075928 A CN 115075928A CN 202210854353 A CN202210854353 A CN 202210854353A CN 115075928 A CN115075928 A CN 115075928A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 456
- 239000004202 carbamide Substances 0.000 title claims abstract description 456
- 238000002347 injection Methods 0.000 title claims abstract description 186
- 239000007924 injection Substances 0.000 title claims abstract description 186
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000003745 diagnosis Methods 0.000 title abstract description 13
- 238000001816 cooling Methods 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 26
- 230000001960 triggered effect Effects 0.000 claims description 15
- 238000010926 purge Methods 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
-
- 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
- F01N2610/148—Arrangement of sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application relates to a method for improving the diagnostic robustness of a urea injection system, in the urea pre-injection stage, a urea pressure sensor monitors urea pressure, the injection quantity of a urea pump during pre-injection is 500-; and in the urea injection stage, the urea pressure sensor always monitors the injection pressure of urea, and when the injection quantity is 500-10000g/h, the urea injection duration is more than 60s, and the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed. Therefore, the method for improving the urea injection system diagnosis robustness can diagnose the low urea pressure fault in the urea pre-injection stage and the urea injection stage, and recover the fault by improving the urea flow after the low urea pressure fault is diagnosed, so that the urea injection system is prevented from reporting the fault, and the fault diagnosis robustness is improved.
Description
Technical Field
The application relates to the technical field of vehicle urea injection system fault diagnosis, in particular to a method for improving the diagnosis robustness of a urea injection system.
Background
In order to reduce NOx and particulate emissions in engine exhaust, the domestic six diesel engine is matched with a post-treatment system comprising a catalytic oxidation Device (DOC), a particulate filter (DPF) and a selective oxidation-reduction device (SCR), urea is injected into an exhaust pipe through a urea injection system, and then the urea is decomposed into NH3 and reacts with the NOx to reduce the NOx emissions.
The national six-emission regulation requires that a urea injection system is monitored, if the urea injection system fails and urea cannot be normally injected, the failure can be reported, and the vehicle is subjected to torsion limitation and speed limitation.
If air exists in the urea, bubbles can be attached to the periphery of the pressure sensor in the running process of the urea pump, the measurement result of the pressure sensor in the urea pump is small, the fault that the urea pressure is low is reported, and the vehicle can limit the torque if the vehicle reports that the urea pressure is low.
Disclosure of Invention
The embodiment of the application provides a method for improving the diagnosis robustness of a urea injection system, and aims to solve the problem that air in urea in the related art can cause low urea pressure and fault, and vehicle torque and speed limit is caused.
In a first aspect, an embodiment of the present application provides a method for improving the diagnostic robustness of a urea injection system, where the urea injection system includes an air pipeline and a urea pipeline both connected to a urea nozzle, the air pipeline is sequentially connected in series with an air solenoid valve and an air pressure sensor, and the urea pipeline is sequentially connected in series with a urea pump and a urea pressure sensor, and the method includes the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor monitors the urea pressure, the injection quantity of the urea pump is 500-;
s2, in the urea injection stage, the urea pressure sensor always monitors the injection pressure of urea, and when the injection quantity is 500-10000g/h, the urea injection duration is more than 60S, and the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed.
In some embodiments, the method further comprises:
s3, when the low urea pressure fault is diagnosed, controlling the urea injection quantity to 10000g/h by the urea pump and continuing for 0.5-30min to remove air bubbles in the urea solution, then diagnosing the low urea pressure fault again, if the low urea pressure fault is eliminated, enabling the urea injection system to work normally, and not reporting the low urea pressure fault;
if the low urea pressure fault is not eliminated, the urea pump is triggered again to control the urea injection amount to be 1000-10000g/h and lasts for 0.5-30min to remove air bubbles in the urea solution, and if the low urea pressure fault is not eliminated after the urea pump is triggered for 3 times, the low urea pressure fault is reported and the urea injection system does not work any more.
In some embodiments, the urea injection system further comprises a check valve connected between the air line and the urea line, and a cooling line connected to the urea nozzle, wherein a cooling solenoid valve is connected in series to the cooling line.
A second aspect of the embodiments of the present application provides a method for improving the diagnostic robustness of a urea injection system, where the urea injection system includes an air pipeline and a urea pipeline both connected to a urea nozzle, the air pipeline is sequentially connected in series with an air solenoid valve, a proportional valve and an air pressure sensor, and the urea pipeline is sequentially connected in series with a urea pump and a urea pressure sensor, and the method includes the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor monitors the urea pressure, the injection quantity of the urea pump is 500-;
s2, in the urea injection stage, the urea pressure sensor always monitors the injection pressure of urea, and when the injection quantity is 500-10000g/h, the urea injection duration is more than 60S, and the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed.
In some embodiments, the method further comprises:
s3, when the low urea pressure fault is diagnosed, controlling the urea injection quantity to 10000g/h by the urea pump and continuing for 0.5-30min to remove air bubbles in the urea solution, then diagnosing the low urea pressure fault again, if the low urea pressure fault is eliminated, enabling the urea injection system to work normally, and not reporting the low urea pressure fault;
if the low urea pressure fault is not eliminated, the urea pump is triggered again to control the urea injection quantity to be 1000-10000g/h and the urea injection quantity is kept for 0.5-30min to remove air bubbles in the urea solution, and if the low urea pressure fault is not eliminated after the urea pump is triggered for 3 times, the low urea pressure fault is reported and the urea injection system does not work any more.
In some embodiments, the urea injection system further comprises a purge solenoid valve connected between the air line and the urea line, and a cooling line connected to the urea nozzle, the cooling line having a cooling solenoid valve connected in series.
In a third aspect of the embodiments of the present application, there is provided a method for improving the diagnostic robustness of a urea injection system, where the urea injection system includes an air pipeline and a urea pipeline both connected to a urea nozzle, the air pipeline is sequentially connected in series with an air solenoid valve and a proportional valve, and the urea pipeline is sequentially connected in series with a urea pump and a urea pressure sensor, the method including the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor monitors the urea pressure, the injection quantity of the urea pump is 500-;
s2, in the urea injection stage, the urea pressure sensor always monitors the injection pressure of urea, and when the injection quantity is 500-10000g/h, the urea injection duration is more than 60S, and the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed.
In some embodiments, the method further comprises:
s3, when the low urea pressure fault is diagnosed, the urea pump controls the urea injection quantity to be 10000g/h (1000-) > and lasts for 0.5-30min to remove air bubbles in the urea solution, then the low urea pressure fault diagnosis is carried out again, if the low urea pressure fault is eliminated, the urea injection system works normally, and the low urea pressure fault is not reported any more;
if the low urea pressure fault is not eliminated, the urea pump is triggered again to control the urea injection amount to be 1000-10000g/h and lasts for 0.5-30min to remove air bubbles in the urea solution, and if the low urea pressure fault is not eliminated after the urea pump is triggered for 3 times, the low urea pressure fault is reported and the urea injection system does not work any more.
In some embodiments, the urea injection system further comprises a purge solenoid valve connected between the air line and the urea line, and a cooling line connected to the urea nozzle, the cooling line having a cooling solenoid valve connected in series.
In some embodiments, an air filter element is further connected in series to the air pipeline, a urea filter element is further connected in series to the urea pipeline, and a cooling water filter element is further connected in series to the cooling pipeline.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a method for improving the diagnostic robustness of a urea injection system, and in the urea pre-injection stage, a urea pressure sensor monitors urea pressure, the injection quantity of a urea pump during pre-injection is 500-20000g/h, the urea pre-injection duration is more than 60s, the urea pressure is less than 150kpa, the low urea pressure fault in the pre-injection stage is diagnosed, and if the low urea pressure fault is not diagnosed, the next step is carried out; and in the urea injection stage, the urea pressure sensor always monitors the injection pressure of urea, and when the injection quantity is 500-10000g/h, the urea injection duration is more than 60s, and the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed. Therefore, the method for improving the urea injection system diagnosis robustness can diagnose the low urea pressure fault in the urea pre-injection stage and the urea injection stage, and recover the fault by improving the urea flow after the low urea pressure fault is diagnosed, so that the urea injection system is prevented from reporting the fault, and the fault diagnosis robustness is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a first embodiment of the present application;
FIG. 3 is a schematic structural diagram of a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a third embodiment of the present application.
Reference numerals:
1. an air line; 2. a urea line; 3. an air solenoid valve; 4. an air pressure sensor; 5. a urea pump; 6. a urea pressure sensor; 7. a urea nozzle; 8. a one-way valve; 9. a proportional valve; 10. purging the electromagnetic valve; 11. an air filter element; 12. a urea filter element; 13. a cooling pipeline; 14. a cooling water filter element; 15. and cooling the electromagnetic valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
The embodiment of the application provides a method for improving the diagnosis robustness of a urea injection system, which can solve the problem that air in urea in the related art can cause low urea pressure failure and vehicle torque and speed limitation.
Referring to fig. 1 and 2, in a first aspect, the embodiment of the present application provides a method for improving the diagnostic robustness of a urea injection system, wherein the urea injection system comprises an air line 1 and a urea line 2 both connected to a urea nozzle 7. An air electromagnetic valve 3 and an air pressure sensor 4 are sequentially connected in series with the air pipeline 1, and compressed air sequentially enters the urea nozzle 7 through the air electromagnetic valve 3 and the air pressure sensor 4 to atomize urea solution. The urea pipeline 2 is sequentially connected with a urea pump 5 and a urea pressure sensor 6 in series, and urea enters a urea nozzle 7 through the urea pump 5 and the urea pressure sensor 6 in sequence to spray urea solution to the SCR. The method comprises the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor 6 monitors the urea pressure, the injection quantity of the urea pump 5 is 500-.
S2, in the urea injection stage, the urea pressure sensor 6 always monitors the injection pressure of urea, when the injection quantity of the urea pump 5 is 500-10000g/h, such as 6000g/h, the urea injection duration is more than 60S, and the urea pressure is less than 150kpa, such as 10kpa, the low urea pressure fault in the injection stage is diagnosed and reported.
In some alternative embodiments, referring to fig. 1 and 2, embodiments of the present application provide a method for improving the robustness of urea injection system diagnostics, the method further comprising the steps of:
s3, when the low urea pressure fault is diagnosed, the urea pump 5 controls the urea injection quantity to be 10000g/h, such as 7000g/h, and lasts for 0.5-30min, such as 10min, so as to remove air bubbles in the urea solution, then the low urea pressure fault is diagnosed again, and if the low urea pressure fault is eliminated, the urea injection system works normally, and the low urea pressure fault is not reported any more.
If the low urea pressure fault is not eliminated, the urea pump is triggered again to control the urea injection amount to be 10000g/h, such as 7000g/h, and the control lasts for 0.5-30min, such as 10min, so as to remove air bubbles in the urea solution, and if the low urea pressure fault is not eliminated after the urea pump is triggered for 3 times, the low urea pressure fault is reported, and the urea injection system does not work any more.
In some alternative embodiments, referring to fig. 1 and 2, the present application provides a method for improving the diagnostic robustness of a urea injection system, wherein the urea injection system further comprises a check valve 8 connected between the air line 1 and the urea line 2, and a cooling line 13 connected with the urea nozzle 7, and a cooling solenoid valve 15 is connected in series on the cooling line 13. An air filter element 11 is also connected in series on the air pipeline 1, a urea filter element 12 is also connected in series on the urea pipeline 2, and a cooling water filter element 14 is also connected in series on the cooling pipeline 13. A check valve 8 is connected between the air pipeline 1 and the urea pipeline 2, and after the check valve 8 is opened, the urea solution in the urea pipeline 2 is swept clean by compressed air to prevent the urea nozzle 7 from crystallizing. The cooling pipeline 13 and the cooling solenoid valve 15 are used for injecting cooling liquid into the urea nozzle 7 so as to reduce the working temperature of the urea nozzle 7 and prevent the urea nozzle 7 from being blocked after the urea nozzle 7 has crystallization failure.
Referring to fig. 1 and 3, a second aspect of the embodiments of the present application provides a method for improving the diagnostic robustness of a urea injection system comprising an air line 1 and a urea line 2 both connected to a urea nozzle 7. An air electromagnetic valve 3, a proportional valve 9 and an air pressure sensor 4 are sequentially connected in series on the air pipeline 1, and compressed air sequentially enters the urea nozzle 7 through the air electromagnetic valve 3, the proportional valve 9 and the air pressure sensor 4 to atomize urea solution. The urea pipeline 2 is sequentially connected with a urea pump 5 and a urea pressure sensor 6 in series, and urea enters a urea nozzle 7 through the urea pump 5 and the urea pressure sensor 6 in sequence to spray urea solution to the SCR. The method comprises the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor 6 monitors the urea pressure, the injection quantity of the urea pump 5 is 500-.
S2, in the urea injection phase, the urea pressure sensor 6 always monitors the injection pressure of the urea, when the injection quantity of the urea pump 5 is 500-10000g/h, such as 6000g/h, the urea injection duration is more than 60S, and the urea pressure is less than 150kpa, such as 10kpa, the urea pressure low fault in the injection phase is diagnosed.
In some alternative embodiments, referring to fig. 1 and 3, embodiments of the present application provide a method for improving the diagnostic robustness of a urea injection system, the method further comprising the steps of:
s3, when the low urea pressure fault is diagnosed, the urea pump 5 controls the urea injection quantity to be 10000g/h, such as 7000g/h, and lasts for 0.5-30min, such as 10min, so as to remove air bubbles in the urea solution, then the low urea pressure fault is diagnosed again, and if the low urea pressure fault is eliminated, the urea injection system works normally, and the low urea pressure fault is not reported any more.
If the low urea pressure fault is not eliminated, the urea pump is triggered again to control the urea injection amount to be 10000g/h, such as 7000g/h, and the control lasts for 0.5-30min, such as 10min, so as to remove air bubbles in the urea solution, and if the low urea pressure fault is not eliminated after the urea pump is triggered for 3 times, the low urea pressure fault is reported, and the urea injection system does not work any more.
In some alternative embodiments, referring to fig. 1 and 3, the present application provides a method for improving the diagnostic robustness of a urea injection system, the urea injection system further includes a purge solenoid valve 10 connected between the air line 1 and the urea line 2, and a cooling line 13 connected to the urea nozzle 7, and a cooling solenoid valve 15 is connected in series on the cooling line 13. An air filter element 11 is further connected in series on the air pipeline 1, a urea filter element 12 is further connected in series on the urea pipeline 2, and a cooling water filter element 14 is further connected in series on the cooling pipeline 13. After the purging electromagnetic valve 10 is opened, the urea solution in the urea pipeline 2 is purged by compressed air, so that the urea nozzle 7 is prevented from crystallizing. The cooling pipeline 13 and the cooling solenoid valve 15 are used for injecting cooling liquid into the urea nozzle 7 so as to reduce the working temperature of the urea nozzle 7 and prevent the urea nozzle 7 from being blocked after the urea nozzle 7 has crystallization failure.
Referring to fig. 1 and 4, a third aspect of the embodiments of the present application provides a method for improving the diagnostic robustness of a urea injection system comprising an air line 1 and a urea line 2 both connected to a urea nozzle 7. An air electromagnetic valve 3 and a proportional valve 9 are sequentially connected in series on the air pipeline 1, and compressed air sequentially enters the urea nozzle 7 through the air electromagnetic valve 3 and the proportional valve 9 to atomize urea solution. A urea pump 5 and a urea pressure sensor 6 are sequentially connected in series on the urea pipeline 2, and urea enters a urea nozzle 7 through the urea pump 5 and the urea pressure sensor 6 in sequence to spray urea solution to the SCR. The method comprises the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor 6 monitors the urea pressure, the injection quantity of the urea pump 5 is 500-.
S2, in the urea injection stage, the urea pressure sensor 6 always monitors the injection pressure of urea, when the injection quantity of the urea pump 5 is 500-10000g/h, such as 6000g/h, the urea injection duration is more than 60S, and the urea pressure is less than 150kpa, such as 10kpa, the low urea pressure fault in the injection stage is diagnosed and reported.
In some alternative embodiments, as shown in fig. 1 and 4, embodiments of the present application provide a method for improving the diagnostic robustness of a urea injection system, the method further comprising the steps of:
s3, when the low urea pressure fault is diagnosed, the urea pump 5 controls the urea injection quantity to be 10000g/h, such as 7000g/h, 1000-.
If the low urea pressure fault is not eliminated, the urea pump is triggered again to control the urea injection amount to be 10000g/h, such as 7000g/h, and the control lasts for 0.5-30min, such as 10min, so as to remove air bubbles in the urea solution, and if the low urea pressure fault is not eliminated after the urea pump is triggered for 3 times, the low urea pressure fault is reported, and the urea injection system does not work any more.
In some alternative embodiments, referring to fig. 4, the urea injection system further comprises a purge solenoid valve 10 connected between the air line 1 and the urea line 2, and a cooling line 13 connected to the urea nozzle 7, and a cooling solenoid valve 15 is connected in series to the cooling line 13. An air filter element 11 is also connected in series on the air pipeline 1, a urea filter element 12 is also connected in series on the urea pipeline 2, and a cooling water filter element 14 is also connected in series on the cooling pipeline 13. After the purging electromagnetic valve 10 is opened, the urea solution in the urea pipeline 2 is purged by using compressed air, so that the urea nozzle 7 is prevented from crystallizing. The cooling pipeline 13 and the cooling solenoid valve 15 are used for injecting cooling liquid into the urea nozzle 7 so as to reduce the working temperature of the urea nozzle 7 and prevent the urea nozzle 7 from being blocked after the urea nozzle 7 has crystallization failure.
Principle of operation
The embodiment of the application provides a method for improving the diagnostic robustness of a urea injection system, because in the urea pre-injection stage, a urea pressure sensor 6 monitors urea pressure, the injection amount of a urea pump 5 during pre-injection is 500-; in the urea injection stage, the urea pressure sensor 6 always monitors the injection pressure of urea, when the injection amount of the urea pump 5 is 10000g/h, the urea injection duration is more than 60s, and the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed. Therefore, the method for improving the urea injection system diagnosis robustness can diagnose the low urea pressure fault in the urea pre-injection stage and the urea injection stage, and recover the fault by improving the urea flow after the low urea pressure fault is diagnosed, so that the urea injection system is prevented from reporting the fault, and the fault diagnosis robustness is improved.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for improving the diagnostic robustness of a urea injection system is characterized by comprising the following steps: the urea injection system comprises an air pipeline (1) and a urea pipeline (2) which are connected with a urea nozzle (7), wherein an air electromagnetic valve (3) and an air pressure sensor (4) are sequentially connected on the air pipeline (1) in series, a urea pump (5) and a urea pressure sensor (6) are sequentially connected on the urea pipeline (2) in series, and the method comprises the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor (6) monitors the urea pressure, the injection quantity of the urea pump (5) is 500-;
s2, in the urea injection stage, the urea pressure sensor (6) always monitors the injection pressure of urea, the injection quantity of the urea pump (5) is 500-10000g/h during injection, the urea injection duration is more than 60S, and when the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed.
2. A method for improving the robustness of urea injection system diagnostics as claimed in claim 1, further comprising:
s3, when the low urea pressure fault is diagnosed, the urea pump (5) controls the urea injection quantity to 10000g/h at 1000-;
if the low urea pressure fault is not eliminated, the urea pump (5) is triggered again to control the urea injection amount to be 10000g/h of 1000-10000g/h and lasts for 0.5-30min to remove bubbles in the urea solution, and if the low urea pressure fault is not eliminated after triggering for 3 times, the low urea pressure fault is reported and the urea injection system does not work any more.
3. A method of improving the robustness of urea injection system diagnostics as claimed in claim 1, wherein:
the urea injection system further comprises a one-way valve (8) connected between the air pipeline (1) and the urea pipeline (2), and a cooling pipeline (13) connected with the urea nozzle (7), wherein a cooling electromagnetic valve (15) is connected to the cooling pipeline (13) in series.
4. A method for improving the diagnostic robustness of a urea injection system is characterized by comprising the following steps: the urea injection system comprises an air pipeline (1) and a urea pipeline (2) which are connected with a urea nozzle (7), wherein an air electromagnetic valve (3), a proportional valve (9) and an air pressure sensor (4) are sequentially connected on the air pipeline (1) in series, and a urea pump (5) and a urea pressure sensor (6) are sequentially connected on the urea pipeline (2) in series, and the method comprises the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor (6) monitors the urea pressure, the injection quantity of the urea pump (5) is 500-;
s2, in the urea injection stage, the urea pressure sensor (6) always monitors the injection pressure of urea, the injection quantity of the urea pump (5) is 500-10000g/h during injection, the urea injection duration is more than 60S, and when the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed.
5. The method of improving the robustness of a urea injection system diagnostic of claim 4, further comprising:
s3, when the low urea pressure fault is diagnosed, the urea pump (5) controls the urea injection quantity to 10000g/h at 1000-;
if the low urea pressure fault is not eliminated, the urea pump (5) is triggered again to control the urea injection quantity to be 1000 plus 10000g/h and lasts for 0.5-30min so as to remove air bubbles in the urea solution, and if the low urea pressure fault is not eliminated after triggering for 3 times, the low urea pressure fault is reported and the urea injection system does not work any more.
6. A method of improving the robustness of urea injection system diagnostics as claimed in claim 4, wherein:
the urea injection system further comprises a purging electromagnetic valve (10) connected between the air pipeline (1) and the urea pipeline (2), and a cooling pipeline (13) connected with the urea nozzle (7), wherein the cooling pipeline (13) is connected with a cooling electromagnetic valve (15) in series.
7. A method for improving the diagnostic robustness of a urea injection system is characterized by comprising the following steps: the urea injection system comprises an air pipeline (1) and a urea pipeline (2) which are connected with a urea nozzle (7), wherein an air electromagnetic valve (3) and a proportional valve (9) are sequentially connected on the air pipeline (1) in series, a urea pump (5) and a urea pressure sensor (6) are sequentially connected on the urea pipeline (2) in series, and the method comprises the following steps:
s1, in the urea pre-injection stage, the urea pressure sensor (6) monitors the urea pressure, the injection quantity of the urea pump (5) is 500-;
s2, in the urea injection stage, the urea pressure sensor (6) always monitors the injection pressure of urea, the injection quantity of the urea pump (5) is 500-10000g/h during injection, the urea injection duration is more than 60S, and when the urea pressure is less than 150kpa, the low urea pressure fault in the injection stage is diagnosed.
8. The method of improving the robustness of a urea injection system diagnostic of claim 7, further comprising:
s3, when the low urea pressure fault is diagnosed, the urea pump (5) controls the urea injection quantity to 10000g/h of 1000-;
if the low urea pressure fault is not eliminated, the urea pump (5) is triggered again to control the urea injection amount to be 10000g/h of 1000-10000g/h and lasts for 0.5-30min to remove bubbles in the urea solution, and if the low urea pressure fault is not eliminated after triggering for 3 times, the low urea pressure fault is reported and the urea injection system does not work any more.
9. A method for improving the robustness of urea injection system diagnostics as claimed in claim 7, wherein:
the urea injection system further comprises a purging electromagnetic valve (10) connected between the air pipeline (1) and the urea pipeline (2), and a cooling pipeline (13) connected with the urea nozzle (7), wherein the cooling pipeline (13) is connected with a cooling electromagnetic valve (15) in series.
10. A method of improving the robustness of urea injection system diagnostics as claimed in claim 9, wherein:
an air filter element (11) is further connected in series on the air pipeline (1), a urea filter element (12) is further connected in series on the urea pipeline (2), and a cooling water filter element (14) is further connected in series on the cooling pipeline (13).
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