CN116412019A - Method and device for detecting urea nozzle faults, storage medium and vehicle - Google Patents
Method and device for detecting urea nozzle faults, storage medium and vehicle Download PDFInfo
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- CN116412019A CN116412019A CN202310310864.2A CN202310310864A CN116412019A CN 116412019 A CN116412019 A CN 116412019A CN 202310310864 A CN202310310864 A CN 202310310864A CN 116412019 A CN116412019 A CN 116412019A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 206
- 239000004202 carbamide Substances 0.000 title claims abstract description 206
- 238000000034 method Methods 0.000 title claims abstract description 46
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 120
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 21
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims description 24
- 230000006641 stabilisation Effects 0.000 claims description 10
- 238000011105 stabilization Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000012805 post-processing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 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
-
- 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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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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- 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 particularly relates to a method and a device for detecting urea nozzle faults, a storage medium and a vehicle. And closing the urea nozzle according to the fact that the post-treatment temperature is smaller than the preset temperature, and obtaining the system stability time of the vehicle. And adjusting the opening of the urea nozzle to a preset opening according to the fact that the system stabilizing time is longer than the first preset time, and acquiring the pressure drop rate of the urea pump. And determining that the urea nozzle is blocked according to the fact that the pressure drop rate is smaller than a preset value. The urea nozzle fault detection method can timely and effectively detect whether the urea nozzle is blocked or not when the emission of nitrogen oxides of an engine exceeds the standard in the running process of the vehicle, so that the problem that the urea nozzle cannot be diagnosed in the current running process of the vehicle and the emission of the nitrogen oxides exceeds the standard is solved.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to a urea nozzle fault detection method and device, a storage medium and a vehicle.
Background
Harmful substances in exhaust gas discharged from an engine of a diesel vehicle are mainly nitrogen oxides and particles. In order to reduce the emission of nitrogen oxides, the tail gas discharged by the engine of the diesel vehicle is firstly treated by the tail gas treatment device and then is discharged into the air. At present, most of tail gas treatment devices inject high-pressure urea solution into an exhaust pipe in a precise and quantitative mode to react with NO in tail gas x Reacting to generate N 2 And H 2 O, thereby reducing NO in the exhaust gas emitted from the engine x . Wherein, the accuracy of the injection quantity of the urea solution influences NO in the automobile exhaust x Important factors of the emission.
The urea nozzle is a key component of a diesel engine aftertreatment system in an emission stage, and has great influence on engine emission, aftertreatment system crystallization and the like. In the actual use process, urea contains impurities and the like, so that a urea nozzle can be blocked and jammed. The urea nozzle card lag can lead to urea injection quantity reduction, and the tail gas can not fully react with urea, so that emission exceeds standard.
However, the diagnosis strategy at the present stage is only suitable for after-sales maintenance, the vehicle enters a maintenance station, the urea nozzle is detached from the installation position of the original vehicle and then is detected, and the problem that whether the urea nozzle is blocked or not can not be accurately judged under the condition that the emission exceeds the standard in the running process of the vehicle.
Disclosure of Invention
The invention aims to at least solve the problem that the urea nozzle cannot be diagnosed at present under the condition that the emission of nitrogen oxides exceeds the standard in the running process of a vehicle. The aim is achieved by the following technical scheme:
the first aspect of the present invention proposes a method for detecting a urea nozzle failure, characterized by comprising:
acquiring the post-treatment temperature according to the exceeding of the emission of nitrogen oxides in the running process of the vehicle;
closing a urea nozzle according to the fact that the post-treatment temperature is smaller than a preset temperature, and obtaining the system stability time of the vehicle;
according to the fact that the system stabilizing time is longer than a first preset time, adjusting the opening of the urea nozzle to a preset opening, and obtaining the pressure drop rate of the urea pump;
and determining that the urea nozzle is blocked according to the pressure drop rate being smaller than a preset value.
According to the urea nozzle fault detection method, under the condition that the vehicle is in the running process and the emission of nitrogen oxides exceeds the standard, the problem of exceeding the standard emission of the nitrogen oxides is detected through detecting the post-treatment temperature, then the urea nozzle is closed successively, and the urea nozzle is opened through a preset opening degree, the pressure drop rate of the urea pump is calculated, and the pressure drop rate is compared with a preset value to determine whether the urea nozzle is blocked or not. Therefore, in the running process of the vehicle, when the emission of the nitrogen oxides of the engine exceeds the standard, whether the urea nozzle is blocked or not can be effectively detected in time, and the problem that the urea nozzle cannot be diagnosed in the running process of the vehicle at present under the condition that the emission of the nitrogen oxides exceeds the standard is solved.
In addition, the urea nozzle failure detection device according to the invention may also have the following additional technical features:
in some embodiments of the present invention, before the step of obtaining the post-treatment temperature according to the emissions of nitrogen oxides exceeding the standard during the running of the vehicle, the method further includes:
acquiring operation data of the vehicle and nitrogen oxide emission of an engine;
determining that the vehicle is in a running state according to the running data of the vehicle meeting the running requirement;
and determining that the emission of the nitrogen oxides of the vehicle in the running process exceeds the standard according to the emission of the nitrogen oxides of the engine exceeding the standard value.
In some embodiments of the invention, the step of closing the urea nozzle and obtaining a system settling time of the vehicle according to the aftertreatment temperature being less than a preset temperature comprises:
according to the closing action of the urea nozzle, the pressure value of the urea pump is obtained in real time;
judging whether the pressure value meets a first preset requirement or not;
and according to the pressure value, the first preset requirement is always met, the urea pump operates at a constant urea pump duty ratio, a first monitoring time is obtained, and the first monitoring time is determined to be the system stabilizing time.
In some embodiments of the invention, the pressure value meeting a first preset requirement comprises:
the pressure value does not exceed a first upper limit value and is not lower than a first lower limit value, wherein the first upper limit value is greater than the first lower limit value.
In some embodiments of the present invention, the step of adjusting the opening of the urea nozzle to a preset opening and obtaining the pressure drop rate of the urea pump according to the system settling time being greater than a first preset time includes:
starting the urea nozzle, and starting timing to acquire a second monitoring time when the opening of the urea nozzle is adjusted to a preset opening;
and determining the pressure drop rate of the urea pump in the second preset time according to the second monitoring time reaching the second preset time.
In some embodiments of the invention, further comprising:
after determining that the urea nozzle is blocked, sending out a fault prompt that the urea nozzle is blocked;
or sending out a fault prompt that the emission exceeds the standard exists and a prompt that the urea nozzle is normal according to the pressure drop rate not smaller than a preset value.
The second aspect of the present invention also provides a device for detecting a failure of a urea nozzle, which is configured to implement the method for detecting a failure of a urea nozzle according to the present invention, and is characterized by comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring aftertreatment temperature, system stability time of a vehicle and pressure drop rate of a urea pump;
the determining module is used for determining whether the post-treatment temperature is smaller than a preset temperature, whether the system stabilization time is longer than a first preset time and whether the urea nozzle is blocked;
and the control module is used for closing or opening the urea nozzle and adjusting the opening degree of the urea nozzle.
In some embodiments of the invention, the acquisition module comprises:
a detection unit for detecting the aftertreatment temperature and the pressure value of the urea pump;
a timing unit;
the judging unit is used for judging and obtaining the system stabilization time;
and a calculation unit for calculating the pressure drop rate.
The third aspect of the present invention also proposes a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method for detecting a urea nozzle failure according to the present invention.
The fourth aspect of the invention also proposes a vehicle comprising the urea nozzle failure detection device according to the invention, applied to a urea supply system in a vehicle comprising a urea pump that injects urea of a target pressure through the urea nozzle.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flow chart of a method for detecting urea nozzle failure according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart before acquiring a post-treatment temperature according to an embodiment of the present invention;
FIG. 3 is a flow chart of acquiring a system stability time of a vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for obtaining a pressure drop rate of a urea pump according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a method for detecting urea nozzle failure according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a urea nozzle failure detection device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an obtaining unit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a urea nozzle failure detection device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.
As shown in fig. 1, according to an embodiment of the present invention, a method for detecting a failure of a urea nozzle is provided, including:
acquiring the post-treatment temperature according to the exceeding of the emission of nitrogen oxides in the running process of the vehicle;
closing the urea nozzle according to the fact that the post-treatment temperature is smaller than the preset temperature, and obtaining the system stability time of the vehicle;
according to the fact that the system stabilizing time is longer than the first preset time, adjusting the opening of the urea nozzle to the preset opening, and obtaining the pressure drop rate of the urea pump;
and determining that the urea nozzle is blocked according to the fact that the pressure drop rate is smaller than a preset value.
According to the urea nozzle fault detection method, when the vehicle is in the running process and the emission of nitrogen oxides exceeds the standard, the problem of exceeding the standard emission of nitrogen oxides is detected through detecting the post-treatment temperature, then the urea nozzle is closed successively, the urea nozzle is opened through a preset opening degree, the pressure drop rate of the urea pump is calculated, and the pressure drop rate is compared with a preset value to determine whether the urea nozzle is blocked. Therefore, in the running process of the vehicle, when the emission of the nitrogen oxides of the engine exceeds the standard, whether the urea nozzle is blocked or not can be effectively detected in time, and the problem that the urea nozzle cannot be diagnosed in the running process of the vehicle at present under the condition that the emission of the nitrogen oxides exceeds the standard is solved.
Specifically, firstly, determining that the vehicle is in the driving process and the emission of nitrogen oxides of the engine exceeds the standard, then detecting the post-treatment temperature T, and comparing the post-treatment temperature T with the preset temperature T Is provided with Comparison was performed. Since the exhaust gas temperature sensor is provided in the existing aftertreatment system for measuring the exhaust gas temperature at different positions on the catalyst, in the present embodiment, the data detected by the exhaust gas temperature sensor can be regarded as the aftertreatment temperature T, and at the same time, the temperature T is preset Is provided with 400 ℃. When the aftertreatment temperature T is less than 400 ℃, the urea nozzle is closed to stop the urea injection. Then after the system is stabilized, and the system is stabilized for a time t 0 Exceeding a first preset time t Is provided with And opening the urea nozzle and keeping the preset opening degree, so that the aim of urea injection with the set urea injection quantity is fulfilled. And at this time, the pressure value V in the urea pump decreases, if the pressure decrease rate DeltaV of the urea pump is smaller than the preset value DeltaV Is provided with It can be determined that a blockage of the urea nozzle has occurred.
In some embodiments of the present invention, before the step of obtaining the post-treatment temperature according to emissions of nitrogen oxides exceeding the standard during running of the vehicle, further comprises:
acquiring running data of a vehicle and the emission of nitrogen oxides of an engine;
determining that the vehicle is in a running state according to the running data of the vehicle meeting the running requirement;
and determining that the emission of the nitrogen oxides exceeds the standard value in the running process of the vehicle according to the emission of the nitrogen oxides of the engine exceeding the standard value.
Specifically, it is necessary to determine whether the vehicle is in a running state and whether the nitrogen oxide emissions of the engine of the vehicle exceed a standard before the post-treatment temperature T is acquired. As shown in fig. 2, in the present embodiment, it is possible to determine whether the post-treatment temperature T needs to be acquired by acquiring the operation data of the vehicle, and the nitrogen oxide discharge amount C of the engine. The running data of the vehicle can be engine speed, vehicle speed or pressure change of the engine, and the vehicle can be determined to be in a running state when all or part of the running data meets the running requirement. Of course, the operation data of the vehicle may include, but is not limited to, the above-described data that can be used to determine that the vehicle is in a running state. The nitrogen oxide emission C of the engine can be detected by a nitrogen oxide sensor, the nitrogen oxide sensor is an existing product, and is a component part in a vehicle aftertreatment system, the detection data is directly adopted, and whether the nitrogen oxide emission of the engine exceeds a standard or not can be determined by comparing the detection data with a specified standard value.
As shown in fig. 3, the step of closing the urea nozzle and obtaining the system stabilization time of the vehicle according to the post-treatment temperature being less than the preset temperature includes:
the method comprises the steps of completing closing action of a urea nozzle, and acquiring a pressure value of a urea pump in real time;
judging whether the pressure value meets a first preset requirement or not;
and (3) always meeting a first preset requirement according to the pressure value, operating the urea pump at a constant urea pump duty ratio, acquiring a first monitoring time, and determining the first monitoring time as a system stabilizing time.
In the present embodiment, the system stability time t of the vehicle. The time after the system has stabilized after the vehicle has turned off the urea nozzle. Wherein the system stability can be determined by observing the pressure value changes of the urea pump. Specifically, when the urea nozzle is closed, the urea pump itself will absorb and return to maintain the stability of the urea pump, but in the process, the pressure value V of the urea pump will still fluctuate, and when the pressure value V of the urea pump is within a certain range, the system can be considered to be stable.
In actual use, after closing the urea nozzle, detecting the pressure value V of the urea pump, starting timing to obtain the recording time when the pressure value V of the urea pump meets the first preset requirement, and selecting the time period meeting the following requirements as the first monitoring time t 1 . Is consistent with the first monitoring time t 1 The required conditions are: the pressure value V of the urea pump meets the limit of the first preset requirement, the urea pump operates at a constant duty ratio of the urea pump, and at the moment, the first monitoring time t 1 Considered as system settling time t 0 . When the urea pump pressure is stable and urea is not injected, the duty ratio of the urea pump can be constant at the moment because the reflux amount is fixed, and the urea pump can operate at the constant duty ratio.
The pressure value meeting a first preset requirement includes: the pressure value does not exceed a first upper limit and is not lower than a first lower limit, wherein the first upper limit is greater than the first lower limit.
Specifically, when the urea pump starts to build up pressure, the opening of the urea nozzle is 95%, after the pressure build-up is completed, the pressure value in the urea pump is 9bar, and after the urea nozzle is closed, the pressure value of the urea pump fluctuates up and down around 9bar, in this embodiment, 0.2bar is used as a fluctuation value for detecting whether the system is stable, that is, 9.2bar is used as the first upper limit V, and 8.8bar is used as the second upper limit V. Therefore, when the pumping pressure value V of the urea pump is at [8.8bar,9.2bar ], the system of the urea pump is considered to be stable.
As shown in fig. 4, the step of adjusting the opening of the urea nozzle to a preset opening according to the system stabilization time being greater than the first preset time and obtaining the pressure drop rate of the urea pump includes:
starting a urea nozzle, and starting timing to acquire a second monitoring time when the opening of the urea nozzle is adjusted to a preset opening;
and determining the pressure drop rate of the urea pump in the second preset time according to the fact that the second monitoring time reaches the second preset time.
Specifically, when the system is determined to be stable, and the system stability time t 0 And setting the time larger than the first preset time t, and controlling to start the urea nozzle. Wherein the first preset time t is set to 10S, i.e. at the system stabilization time t 0 When the time exceeds 10S, the urea nozzle is turned on. In the present embodiment, when the opening of the urea nozzle needs to be adjusted to a preset opening, the timing is started, and the preset opening is 100%, so when the opening of the urea nozzle is 100%, the timing is started, and at this time, the timing time is the second monitoring time t 2 。
In the present embodiment, the second preset time t 2 Set to 2S. When the second monitoring time t 2 When 2S is reached, the pressure drop rate Δv is calculated from the pressure value of the urea pump at that time. Then according to the calculated pressure drop rate and the preset value DeltaV Is provided with Comparison was performed. In this embodiment, the preset value is 0.5bar/s. The preset value DeltaV Is provided with Is a fixed value and can be obtained by specific tests. When the pressure drop rate is less than 0.5bar/s, it can be determined that the urea nozzle is clogged. When the pressure drop rate is greater than or equal to 0.5bar/s, it can be determined that the urea nozzle is normal.
In some embodiments of the invention, further comprising:
after determining that the urea nozzle is blocked, sending out a fault prompt that the urea nozzle is blocked;
or, according to the pressure drop rate not smaller than the preset value, sending out a fault prompt that the emission exceeds the standard and a prompt that the urea nozzle is normal.
After the urea nozzle is determined to be blocked, a fault prompt of the urea nozzle blocking can be sent to a driver to remind a user to repair and provide a direction for the investigation of a service station. Meanwhile, when the pressure drop rate is not smaller than a preset value, the condition that the urea nozzle is normal at the moment but the emission of nitrogen oxides of the engine exceeds the standard can be determined, and at the moment, a fault indication of exceeding the emission standard and an indication of the normal urea nozzle can be sent to a driver. It should be noted that, the fault prompt may be a liquid crystal display or an alarm sound prompt, and the existing fault prompt modes are more and more mature, so that detailed description is omitted.
As shown in fig. 5, in the actual use process of the detection method, firstly, the operation data of the vehicle is obtained, then, whether the vehicle is in a driving state is judged, and if not, the operation data of the vehicle is obtained again; if yes, obtaining the nitrogen oxide emission C of the engine, and if the nitrogen oxide emission C does not exceed the standard value C Label (C) Re-acquiring the nitrogen oxide emission C of the engine; if the emission amount C of nitrogen oxides exceeds the standard value C Label (C) The post-treatment temperature T is obtained.
When T is greater than or equal to preset temperature T Is provided with Re-acquiring the post-treatment temperature T; when T is less than the preset temperature T Is provided with And closing the urea nozzle and acquiring the pressure value V of the urea pump. Then, judging whether the pressure value V of the urea pump meets the following conditions: first upper limit value V Upper part More than or equal to V and more than or equal to a first lower limit value V Lower part(s) If not, re-acquiring the pressure value V of the urea pump; if yes, starting timing and obtaining a first monitoring time t 1 . Subsequently, the first monitoring time t is judged 1 Whether or not it satisfies: t is t 1 > preset temperature t Is provided with If not, continuing to acquire the first monitoring time T 1 The method comprises the steps of carrying out a first treatment on the surface of the If yes, opening the urea nozzle, and adjusting the opening of the urea nozzle to be a preset opening.
Then, a second monitoring time t is obtained 2 When the second monitoring time t 2 Satisfy t 2 =second preset time t Is provided with At' time, the pressure drop rate Δv is calculated; if the condition is not satisfied, continuing to acquire the second monitoring time t 2 The method comprises the steps of carrying out a first treatment on the surface of the Finally, judging whether the pressure drop rate delta V meets delta V < delta V Is provided with The method comprises the steps of carrying out a first treatment on the surface of the If the above conditions are met, at this time, it can be determined that the urea nozzle is clogged; if the above condition is not satisfied, it can be determined that the urea nozzle isOften times.
In a second aspect, the present invention provides a device for detecting a urea nozzle failure, for implementing the method for detecting a urea nozzle failure described above. The detection device comprises an acquisition module, a determination module and a control module.
The acquisition module is used for acquiring the aftertreatment temperature, the system stability time of the vehicle and the pressure drop rate of the urea pump. The determination module is used for determining whether the post-treatment temperature is less than a preset temperature, whether the system stabilization time is greater than a first preset time and whether the urea nozzle is blocked. The control module is used for closing or opening the urea nozzle and can adjust the opening degree of the urea nozzle.
As shown in fig. 6, the acquiring module acquires the post-processing temperature T, and then the determining module determines whether the post-processing temperature is less than the preset temperature according to the information transmitted by the acquiring module. And when the post-treatment temperature is less than the preset temperature, the control module works and closes the urea nozzle.
After the urea nozzle is closed, the acquisition module begins to acquire the system settling time of the vehicle. And then, the determining module judges whether the system stability time is longer than a first preset time according to the information transmitted by the acquiring module. If the system stabilization time is longer than the first preset time, the control module receives the information transmitted by the determination module, and at the moment, the control module starts the urea nozzle and adjusts the opening of the urea nozzle to the preset opening.
Then, after the urea nozzle is opened and the opening requirement is met, the acquisition module starts to acquire the pressure drop rate of the urea pump, and after the determination module receives the pressure drop rate transmitted by the acquisition module, the pressure drop rate is compared with a preset value to judge whether the urea nozzle is blocked or not.
In some embodiments of the present invention, the acquisition module includes a detection unit, a timing unit, a determination unit, and a calculation unit. The detection unit is used for detecting the aftertreatment temperature and the pressure value of the urea pump. The judging unit is used for judging and obtaining the system stability time. The calculation unit is used for calculating the pressure drop rate.
Specifically, as shown in fig. 7, the detection unit detects the post-processing temperature and transmits the detection result to the outside. The detection unit also detects the pressure value of the urea pump after receiving the information that the urea nozzle is closed. The judging unit judges the system stability time meeting the requirements according to the pressure value transmitted by the detecting unit and the recording time transmitted by the timing unit, and then transmits the judging result to the outside. The judging unit can control the timing unit to work or stop by judging whether the pressure value meets a first preset requirement, so as to judge the system stability time. Of course, the judging unit can also synchronously judge the first monitoring time meeting the requirement of the system stability time according to the pressure value transmitted by the detecting unit and the recording time transmitted by the timing unit.
And finally, the calculating unit calculates the pressure drop rate of the urea pump according to the information transmitted by the timing unit and the information transmitted by the detecting unit.
As shown in fig. 8, the present embodiment provides a block diagram of an electronic device. The electronic device includes at least a processor and a memory.
The processor is used for controlling the whole operation of the electronic equipment so as to complete all or part of the steps in the urea nozzle fault detection method. The memory is used to store various types of data to support operation at the electronic device, which may include, for example, instructions for any application or method operating on the electronic device, as well as application-related data, such as contact data, messages, pictures, audio, video, and so forth. The memory may be implemented by any type or combination of volatile or nonvolatile memory devices such as static random access memory, electrically erasable programmable read only memory, magnetic memory, flash memory, magnetic or optical disk. In addition, the electronic device may include other components such as multimedia components. The multimedia components may include screen and audio components, which will not be described in detail herein as the technology is mature.
In this embodiment, the electronic device may be implemented by one or more application specific integrated circuits, digital signal processors, digital signal processing devices, programmable logic devices, field programmable gate arrays, controllers, microcontrollers, microprocessors or other electronic components for performing the urea nozzle fault detection method described above.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described urea nozzle failure detection method. For example, the computer readable storage medium may be the above-described memory including a program executable by a processor of the electronic device to perform the urea nozzle failure detection method described above.
According to a fourth aspect of the embodiment of the invention, a vehicle is provided, which comprises the urea nozzle fault detection device. The detection device is applied to a urea supply system in a vehicle, the urea supply system including a urea pump that injects urea at a target pressure through a urea nozzle.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A method for detecting a urea nozzle failure, comprising:
acquiring the post-treatment temperature according to the exceeding of the emission of nitrogen oxides in the running process of the vehicle;
closing a urea nozzle according to the fact that the post-treatment temperature is smaller than a preset temperature, and obtaining the system stability time of the vehicle;
according to the fact that the system stabilizing time is longer than a first preset time, adjusting the opening of the urea nozzle to a preset opening, and obtaining the pressure drop rate of the urea pump;
and determining that the urea nozzle is blocked according to the pressure drop rate being smaller than a preset value.
2. The method for detecting a urea nozzle failure according to claim 1, wherein before the step of obtaining the post-treatment temperature according to the emissions of nitrogen oxides exceeding the standard during the running of the vehicle, further comprises:
acquiring operation data of the vehicle and nitrogen oxide emission of an engine;
determining that the vehicle is in a running state according to the running data of the vehicle meeting the running requirement;
and determining that the emission of the nitrogen oxides of the vehicle in the running process exceeds the standard according to the emission of the nitrogen oxides of the engine exceeding the standard value.
3. The method according to claim 1, wherein the step of closing the urea nozzle and obtaining the system stabilization time of the vehicle according to the post-treatment temperature being less than a preset temperature comprises:
according to the closing action of the urea nozzle, the pressure value of the urea pump is obtained in real time;
judging whether the pressure value meets a first preset requirement or not;
and according to the pressure value, the first preset requirement is always met, the urea pump operates at a constant urea pump duty ratio, a first monitoring time is obtained, and the first monitoring time is determined to be the system stabilizing time.
4. A method of detecting urea nozzle failure according to claim 3, wherein the pressure value meeting a first preset requirement comprises:
the pressure value does not exceed a first upper limit value and is not lower than a first lower limit value, wherein the first upper limit value is greater than the first lower limit value.
5. A method for detecting a urea nozzle failure according to claim 3, wherein the step of adjusting the opening degree of the urea nozzle to a preset opening degree and obtaining the pressure drop rate of the urea pump according to the system settling time being greater than a first preset time comprises:
starting the urea nozzle, and starting timing to acquire a second monitoring time when the opening of the urea nozzle is adjusted to a preset opening;
and determining the pressure drop rate of the urea pump in the second preset time according to the second monitoring time reaching the second preset time.
6. The method for detecting a urea nozzle failure according to claim 1, further comprising:
after determining that the urea nozzle is blocked, sending out a fault prompt that the urea nozzle is blocked;
or sending out a fault prompt that the emission exceeds the standard exists and a prompt that the urea nozzle is normal according to the pressure drop rate not smaller than a preset value.
7. A urea nozzle failure detection device for implementing the urea nozzle failure detection method according to any one of claims 1 to 6, characterized by comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring aftertreatment temperature, system stability time of a vehicle and pressure drop rate of a urea pump;
the determining module is used for determining whether the post-treatment temperature is smaller than a preset temperature, whether the system stabilization time is longer than a first preset time and whether the urea nozzle is blocked;
and the control module is used for closing or opening the urea nozzle and adjusting the opening degree of the urea nozzle.
8. The urea nozzle failure detection apparatus according to claim 7, wherein the acquisition module comprises:
a detection unit for detecting the aftertreatment temperature and the pressure value of the urea pump;
a timing unit;
the judging unit is used for judging and obtaining the system stabilization time;
and a calculation unit for calculating the pressure drop rate.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method for detecting a urea nozzle failure according to any one of claims 1 to 6.
10. A vehicle comprising the urea nozzle failure detection device according to claim 7 or 8, applied to a urea supply system in a vehicle, the urea supply system comprising a urea pump that injects urea of a target pressure through the urea nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310310864.2A CN116412019A (en) | 2023-03-23 | 2023-03-23 | Method and device for detecting urea nozzle faults, storage medium and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310310864.2A CN116412019A (en) | 2023-03-23 | 2023-03-23 | Method and device for detecting urea nozzle faults, storage medium and vehicle |
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| CN116412019A true CN116412019A (en) | 2023-07-11 |
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| CN202310310864.2A Pending CN116412019A (en) | 2023-03-23 | 2023-03-23 | Method and device for detecting urea nozzle faults, storage medium and vehicle |
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| Country | Link |
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| CN (1) | CN116412019A (en) |
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2023
- 2023-03-23 CN CN202310310864.2A patent/CN116412019A/en active Pending
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