CN114810298B - Urea nozzle fault detection method and device, storage medium and vehicle - Google Patents
Urea nozzle fault detection method and device, storage medium and vehicle Download PDFInfo
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- CN114810298B CN114810298B CN202110064498.8A CN202110064498A CN114810298B CN 114810298 B CN114810298 B CN 114810298B CN 202110064498 A CN202110064498 A CN 202110064498A CN 114810298 B CN114810298 B CN 114810298B
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 300
- 239000004202 carbamide Substances 0.000 title claims abstract description 300
- 238000001514 detection method Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000007921 spray Substances 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 19
- 239000007924 injection Substances 0.000 abstract description 19
- 239000002699 waste material Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- KLDZYURQCUYZBL-UHFFFAOYSA-N 2-[3-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCN=CC1=CC=CC=C1O KLDZYURQCUYZBL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 201000001098 delayed sleep phase syndrome Diseases 0.000 description 1
- 208000033921 delayed sleep phase type circadian rhythm sleep disease Diseases 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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]
-
- 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
-
- 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
- F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
Landscapes
- 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 present disclosure relates to a urea nozzle failure detection method, apparatus, storage medium, and vehicle, the method being applied to a urea supply system in a vehicle, the urea supply system including a urea supply pump that injects urea of a target pressure through the urea nozzle, a rotational speed of the urea supply pump being inversely related to a pressure at the urea nozzle, by acquiring rotational speed information of the urea supply pump over a preset period of time; determining a fault detection parameter according to the rotation speed information; and determining the fault state of the urea nozzle according to the fault detection parameter. Thus, the fault state of the urea nozzle can be timely and effectively detected, thereby being beneficial to timely eliminating faults, avoiding waste of urea caused by frequent urea injection and avoiding NO in vehicle tail gas caused by NO-injection or less urea injection quantity x And the emission exceeds the standard.
Description
Technical Field
The disclosure relates to the technical field of vehicles, in particular to a urea nozzle fault detection method and device, a storage medium and a vehicle.
Background
With the continuous tightening of national regulations on the requirements of motor vehicle exhaust emissions, in order to reduce NO in the vehicle exhaust x Is usually added with an SCR (Selective Catalytic Reduction ) system on the vehicle, and the high-pressure urea solution is precisely and quantitatively injected into the exhaust pipe to react with NO in the tail gas x Reacting to generate N 2 And H 2 O. The accuracy of the injection quantity of urea solution influences NO in automobile exhaust x The emissions are very important factors. However, in the actual operation process, the valve rod of the urea nozzle is often blocked by crystals in the use process due to the influence of urea crystallization, so that the valve rod cannot act, the phenomenon that urea is normally sprayed or the nozzle does not spray urea occurs, and NO in the tail gas of a vehicle can be caused due to the fact that urea is not sprayed or the spraying amount of urea is small x Emissions exceed standard, causing environmental pollution, and urea is often sprayed to cause waste of urea.
The existing fault detection method for the urea nozzle cannot timely and accurately find the fault of the urea nozzle, is unfavorable for timely processing the fault, and cannot avoid NO in the tail gas of the vehicle x Emissions exceeding and urea consumption exceeding。
Disclosure of Invention
The disclosure aims to provide a urea nozzle fault detection method, a urea nozzle fault detection device, a storage medium and a vehicle.
To achieve the above object, a first aspect of the present disclosure provides a urea nozzle failure detection method applied to a urea supply system in a vehicle, the urea supply system including a urea supply pump that injects urea of a target pressure through the urea nozzle, a rotation speed of the urea supply pump being inversely related to a pressure at the urea nozzle, the method comprising:
acquiring rotating speed information of a urea supply pump in a preset time period;
determining a fault detection parameter according to the rotation speed information, wherein the fault detection parameter is the average rotation speed in the preset time period or the rotation speed of the urea supply pump in the preset time period;
and determining the fault state of the urea nozzle according to the fault detection parameter.
Optionally, the fault state includes a blocking fault state and a normal spraying fault state, and the determining the fault state of the urea nozzle according to the fault detection parameter includes:
under the condition that the fault detection parameter is less than or equal to a first preset parameter threshold value, determining that the urea nozzle is in the blocking fault state; or,
and under the condition that the fault detection parameter is larger than or equal to a second preset parameter threshold value, determining that the urea nozzle is in the normal spraying fault state.
Optionally, the urea nozzle comprises a solenoid valve, the method further comprising:
in case it is determined that the urea nozzle is in a failure state, self-cleaning is performed by any one of the following ways:
increasing the opening frequency of the electromagnetic valve;
or,
and increasing the valve opening force and/or the valve closing force of the electromagnetic valve.
Optionally, the method further comprises:
acquiring the duration time that the urea nozzle is in a fault state;
and under the condition that the duration time is larger than or equal to a preset time threshold value, sending out an alarm reminding message.
In a second aspect of the present disclosure there is provided a urea nozzle failure detection apparatus for use in a urea supply system in a vehicle, the urea supply system comprising a urea supply pump that injects urea at a target pressure through the urea nozzle, the speed of the urea supply pump being inversely related to the pressure at the urea nozzle, the apparatus comprising:
the first acquisition module is used for acquiring the rotating speed information of the urea supply pump in a preset time period;
the first determining module is used for determining a fault detection parameter according to the rotating speed information, wherein the fault detection parameter is the average rotating speed in the preset time period or the rotating speed of the urea supply pump in the preset time period;
and the second determining module is used for determining the fault state of the urea nozzle according to the fault detection parameter.
Optionally, the fault state includes a blocking fault state and a normal spraying fault state, and the second determining module is configured to:
under the condition that the fault detection parameter is less than or equal to a first preset parameter threshold value, determining that the urea nozzle is in the blocking fault state; or,
and under the condition that the fault detection parameter is larger than or equal to a second preset parameter threshold value, determining that the urea nozzle is in the normal spraying fault state.
Optionally, the urea nozzle comprises a solenoid valve, the device further comprising:
a self-cleaning module for self-cleaning by any one of the following means in case it is determined that the urea nozzle is in a faulty state:
increasing the opening frequency of the electromagnetic valve;
or,
and increasing the valve opening force and/or the valve closing force of the electromagnetic valve.
Optionally, the apparatus further comprises:
a second acquisition module for acquiring the duration of time that the urea nozzle is in a failure state;
and the alarm module is used for sending out alarm reminding information under the condition that the duration time is determined to be greater than or equal to a preset time threshold value.
In a third aspect of the present disclosure there is provided a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of the first aspect above.
In a fourth aspect of the present disclosure, a vehicle includes the urea nozzle failure detection apparatus described in the above second aspect.
The technical solution is that by providing a urea nozzle fault detection method, the method is applied to a urea supply system in a vehicle, the urea supply system comprises a urea supply pump, the urea supply pump sprays urea with target pressure through the urea nozzle, the rotating speed of the urea supply pump is inversely related to the pressure at the urea nozzle, and the rotating speed information of the urea supply pump in a preset time period is obtained; determining a fault detection parameter according to the rotation speed information, wherein the fault detection parameter is the average rotation speed in the preset time period or the rotation speed of the urea supply pump in the preset time period; and determining the fault state of the urea nozzle according to the fault detection parameter. Thus, the fault state of the urea nozzle can be timely and effectively detected, thereby being beneficial to timely eliminating faults, avoiding waste of urea caused by frequent urea injection and avoiding NO in vehicle tail gas caused by NO-injection or less urea injection quantity x And the emission exceeds the standard.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic illustration of an exhaust treatment process according to an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a urea nozzle according to an exemplary embodiment of the present disclosure;
FIG. 3 is a flow chart illustrating a urea nozzle fault detection method according to an exemplary embodiment of the present disclosure;
FIG. 4 is a flow chart illustrating a urea nozzle failure detection method according to the embodiment of FIG. 3 of the present disclosure;
FIG. 5 is a block diagram of a urea nozzle failure detection device, as shown in an exemplary embodiment of the present disclosure;
FIG. 6 is a block diagram of a urea nozzle failure detection device according to the embodiment shown in FIG. 5;
fig. 7 is a block diagram of an electronic device, according to an example embodiment.
Description of the reference numerals
201 urea nozzle valve stem 202 urea nozzle housing;
203 designates a solenoid valve 2011 urea inlet;
2012, passing the liquid through holes 2021;
2031 attracts coil 2032 springs.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Before describing the embodiments of the present disclosure in detail, the following description is first made in the application scenario of the present disclosure, which may be applied to an SCR (or SDPF (Diesel Particle Filter with SCR Function, diesel particulate filter with SCR function)) urea injection control process in a vehicle, where the description is given taking SCR urea injection as an example, and the present disclosure is now aimed at reducing the following descriptionLow NO in vehicle exhaust x Is generally carried out by exhaust gas treatment as shown in FIG. 1. FIG. 1 is a schematic diagram of an exhaust gas treatment process according to an exemplary embodiment of the present disclosure, as shown in FIG. 1, in which exhaust gas generated from vehicle fuel is first passed through an LNT (Lean NO X trap, lean burn NO X Trapping technology), then passing through a DPF (Diesel Particulate Filter, diesel particle catcher), and finally sending the exhaust gas flowing through the DPF into an SCR, and reacting with urea sprayed by a urea nozzle in the SCR, thereby leading NO in the vehicle exhaust gas x Conversion to N 2 And (5) excluding. In the prior art, the urea is generally sprayed out from a urea nozzle shown in fig. 2, and fig. 2 is a schematic structural view of a urea nozzle according to an exemplary embodiment of the disclosure; referring to fig. 2, the urea nozzle is composed of a urea nozzle valve rod 201, a urea nozzle housing 202, and a specified solenoid valve 203, the urea nozzle valve rod 201 includes a urea liquid inlet 2011 and a liquid through hole 2012, a spray hole 2021 is provided on the urea nozzle housing 202, the specified solenoid valve 203 is composed of a suction coil 2031 and a spring 2032, after the specified solenoid valve 203 is energized, the magnetic force generated by the suction coil 2031 attracts the urea nozzle valve rod 201 to move left against the elastic force of the spring 2032, at this time, since the head of the urea nozzle valve rod 201 leaves the spray hole 2021 of the urea nozzle head, urea liquid flows from the urea liquid inlet 2011 of the urea nozzle to the liquid through hole 2012 of the urea nozzle valve rod through the spray hole 2021 in an arrow path. Similarly, when the urea nozzle does not work, the attraction coil 2031 of the urea nozzle is powered off to lose magnetic force, the urea nozzle valve rod 201 moves rightward under the action of the elastic force of the spring 2032, and urea liquid cannot be ejected from the nozzle hole 2021 because the urea nozzle valve rod 201 closes the nozzle hole 2021. However, urea CO (NH) 2 ) 2 Crystallization is easy after dehydration by heating, and thus adhesion of the outer edge of the urea nozzle stem 201 to the urea nozzle housing 202 by the crystallization is often caused. The magnetic force generated by the suction coil 2031 of the urea nozzle is enabled to suck and fix the urea nozzle valve rod 201, so that the urea nozzle does not spray urea, namely the urea nozzle fails, and NO in the tail gas of the vehicle can be caused under the condition that the urea nozzle does not spray urea x The emission exceeds the standard. In addition, theThe outer edge of the urea nozzle valve rod 201 is also often blocked by crystals, so that the head of the urea nozzle valve rod cannot be attached to the spray hole 2021, and the phenomenon that urea is sprayed frequently occurs, so that the problem of excessively high consumption of urea can be definitely caused. Timely and accurate finding of the urea nozzle faults is beneficial to timely processing the faults, thereby avoiding NO in the tail gas of the vehicle x Emissions exceeding and excessive consumption of urea.
In the related art, the fault detection method for the urea nozzle is generally based on NO in the tail gas x Judging the content of NO in the tail gas x Under the condition that the content is not out of standard, the urea nozzle is determined to be free of faults, the judgment is obviously inaccurate, the normal spraying faults cannot be found timely, namely, the fault detection method for the urea nozzle in the related art cannot find the faults of the urea nozzle timely and accurately, the faults are not favorable for timely processing, and NO in the tail gas of a vehicle cannot be avoided x Emissions exceeding and excessive consumption of urea.
In order to solve the technical problems described above, the present disclosure provides a urea nozzle failure detection method, a device, a storage medium, and a vehicle, the method being applied to a urea supply system in a vehicle, the urea supply system including a urea supply pump that injects urea of a target pressure through the urea nozzle, a rotational speed of the urea supply pump being inversely related to a pressure at the urea nozzle, by acquiring rotational speed information of the urea supply pump over a preset period of time; determining a fault detection parameter according to the rotation speed information, wherein the fault detection parameter is the average rotation speed in the preset time period or the rotation speed of the urea supply pump in the preset time period; and determining the fault state of the urea nozzle according to the fault detection parameter. Thus, the fault state of the urea nozzle can be timely and effectively detected, thereby being beneficial to timely eliminating faults, avoiding waste of urea caused by frequent urea injection and avoiding NO in vehicle tail gas caused by NO-injection or less urea injection quantity x And the emission exceeds the standard.
The present disclosure is described below in conjunction with the specific embodiments.
FIG. 3 is a flow chart illustrating a urea nozzle fault detection method according to an exemplary embodiment of the present disclosure; referring to fig. 3, the method may include the steps of:
step 301, obtaining rotation speed information of a urea supply pump in a preset time period.
The urea supply pump sprays urea with target pressure through the urea nozzle, the rotating speed of the urea supply pump is inversely related to the pressure at the urea nozzle, and the rotating speed information in the preset time period can comprise the result of sampling the rotating speed of the urea supply pump for a plurality of times in the preset time period, namely a plurality of rotating speeds corresponding to the plurality of times of sampling.
The urea supply pump belongs to a urea supply system in a vehicle, and may further include a urea tank in addition to the urea supply pump, the urea supply pump being connected to the urea tank through a urea line, the urea supply pump injecting urea of a target pressure for the SCR (or SDPF) through the urea nozzle, the rotation speed of the urea supply pump being increased to increase the urea pressure at the urea nozzle when the urea pressure at the urea nozzle is less than the target pressure, and being decreased to decrease the urea pressure at the urea nozzle when the urea pressure at the urea nozzle is greater than the target pressure, thereby maintaining the urea pressure at the urea nozzle in the vicinity of the target pressure.
Step 302, determining a fault detection parameter according to the rotation speed information.
Wherein the failure detection parameter is an average rotation speed in the preset time period, or a rotation number of the urea supply pump in the preset time period. Here, the rotation number may be obtained by calculating an integral of the rotation speed over the preset period.
For example, if the preset time period is 65 seconds, 2 rotational speeds are collected every second, 130 rotational speeds are corresponding to the 65 seconds, and the average rotational speed is obtained by dividing the sum of the 130 rotational speeds by 130.
In addition, in calculating the number of revolutions, one possible implementation may be: firstly, obtaining a function corresponding to the variation of the rotating speed in the preset time period, and fitting a plurality of rotating speeds acquired in the preset time period to obtain a functional relation between the rotating speed and time in the preset time period, so that the functional relation is integrated in the preset time period to obtain the rotating speed.
In this step, another possible embodiment is when calculating the number of revolutions: and obtaining the corresponding unit revolution in the time period between the current revolution collection and the last revolution collection, and obtaining the sum of a plurality of unit revolutions in the preset time period to obtain the revolution of the urea supply pump in the preset time period.
For example, if the preset time period is 15 seconds, the rotational speed is collected every 5 seconds, the rotational speed collected for the first time is the rotational speed collected at 5 seconds, if the rotational speed collected is a, the rotational speed collected for the second time is the rotational speed collected at 10 seconds, the rotational speed collected is B, the rotational speed collected for the third time is the rotational speed collected at 15 seconds, the rotational speed collected is C, the rotational speed of the urea supply pump during the preset time period may beThe above examples are only for illustrative purposes of explaining how the number of revolutions of the urea feed pump is within the preset time period, and are not intended to limit the specific scope of protection.
Step 303, determining the fault status of the urea nozzle according to the fault detection parameter.
Wherein the fault conditions include a jam fault condition and a constant spray fault condition.
One possible implementation manner in this step is as follows: under the condition that the fault detection parameter is less than or equal to a first preset parameter threshold value, determining that the urea nozzle is in the blocking fault state; or determining that the urea nozzle is in the normal-spraying fault state under the condition that the fault detection parameter is greater than or equal to a second preset parameter threshold value.
The first preset parameter threshold is a first rotation speed threshold and the second preset parameter threshold is a second rotation speed threshold when the fault detection parameter is the average rotation speed, the first rotation speed threshold is smaller than the second rotation speed threshold, and the first preset parameter threshold is a first rotation speed threshold and the second preset parameter threshold is a second rotation speed threshold when the fault detection parameter is the rotation speed, and the first rotation speed threshold is smaller than the second rotation speed threshold.
It should be noted that the first rotation speed threshold and the second rotation speed threshold may be determined according to the zero consumption rotation speed of the urea nozzle, where the zero consumption rotation speed is a rotation speed of the urea supply pump when the urea nozzle does not spray urea, for example, the first rotation speed threshold may be a zero consumption rotation speed of a first preset multiple, and the second rotation speed threshold may be a zero consumption rotation speed of a second preset multiple.
In addition, the first revolution threshold and the second revolution threshold may be determined according to the zero-consumption revolution of the urea nozzle, where the zero-consumption revolution is a revolution of the urea supply pump in the preset time period when the urea nozzle does not spray urea. For example, the first threshold of revolutions may be a third predetermined multiple of zero revolutions consumed, and the second threshold of revolutions may be a fourth predetermined multiple of zero revolutions consumed.
According to the technical scheme, the rotating speed information of the urea supply pump in the preset time period is obtained; determining a fault detection parameter according to the rotation speed information, wherein the fault detection parameter is the average rotation speed in the preset time period or the rotation speed of the urea supply pump in the preset time period; and determining the fault state of the urea nozzle according to the fault detection parameter. The fault state of the urea nozzle can be timely and effectively detected, so that the fault can be timely removed, the waste of urea caused by frequent urea injection can be avoided, and NO in the vehicle tail gas caused by NO urea injection or less urea injection amount can be avoided x And the emission exceeds the standard.
Optionally, the urea nozzle may further include a solenoid valve, and after determining the fault condition of the urea nozzle according to the fault detection parameter in step 303, the method may further include:
in case it is determined that the urea nozzle is in a failure state, self-cleaning is performed by any one of the following ways: increasing the opening frequency of the solenoid valve; or increasing the valve opening force and/or the valve closing force of the electromagnetic valve.
It should be noted that, because the fault state of the urea nozzle is stuck by urea crystals, after the fault state is identified, the current or voltage to the attraction coil in the electromagnetic valve can be increased by the control system of urea injection, so that the urea nozzle is attracted (i.e. the valve opening force of the electromagnetic valve is increased) or pushed (i.e. the valve closing force of the electromagnetic valve is increased) by a larger magnetic force, thereby generating a crystal breaking effect.
In addition, since urea crystallization is a reversible behavior. For example, when we manually actuate a valve stem of a urea nozzle that has "failed to crystallize" and then let urea through, these crystals will disappear after being hydrolyzed (dissolved) by the urea liquid. Therefore, the opening frequency of the electromagnetic valve is increased, the hydrolysis rate of the crystal can be effectively improved, the self-cleaning effect is achieved, and therefore faults can be effectively relieved, and even relieved.
Thus, by increasing the opening frequency of the solenoid valve; or, the valve opening force and/or the valve closing force of the electromagnetic valve are increased, so that the self-cleaning function can be effectively realized, and the effect of relieving or even removing the fault of the urea nozzle is achieved.
FIG. 4 is a flow chart illustrating a urea nozzle failure detection method according to the embodiment of FIG. 3 of the present disclosure; referring to fig. 4, the method may further include the steps of:
step 304, the duration of time that the urea nozzle is in a fault state is obtained.
In step 305, an alarm alert message is sent out if the duration is determined to be greater than or equal to the preset time threshold.
In the step, the vehicle user can be prompted to timely perform manual fault elimination treatment through the alarm prompt message so as to ensure that the urea nozzle works normally and avoid the problems of exceeding of NOx emission and overhigh consumption of urea in the tail gas of the vehicle.
The technical proposal is that by acquiring the duration time of the urea nozzle in the fault state, the following steps are determinedUnder the condition that the duration is greater than or equal to a preset time threshold value, an alarm reminding message is sent out, and a vehicle user can be timely prompted to conduct manual fault removal processing under the condition that self-cleaning is invalid, so that faults can be timely removed, normal operation of the urea nozzle is guaranteed, and NO in vehicle tail gas is avoided x Emissions exceeding and urea consumption exceeding.
FIG. 5 is a block diagram of a urea nozzle failure detection device, as shown in an exemplary embodiment of the present disclosure; referring to fig. 5, the urea nozzle failure detection apparatus may be applied to a urea supply system in a vehicle including a urea supply pump that injects urea of a target pressure through the urea nozzle, the rotational speed of the urea supply pump being inversely related to the pressure at the urea nozzle, the apparatus may include:
a first obtaining module 501, configured to obtain rotational speed information of the urea supply pump in a preset time period;
a first determining module 502, configured to determine a fault detection parameter according to the rotation speed information, where the fault detection parameter is an average rotation speed in the preset time period, or a rotation number of the urea supply pump in the preset time period;
a second determination module 503 is configured to determine a fault status of the urea nozzle according to the fault detection parameter.
In the above technical solution, the first obtaining module 501 obtains the rotation speed information of the urea supply pump in a preset time period; determining, by the first determining module 502, a fault detection parameter according to the rotational speed information; the fault status of the urea nozzle is determined by a second determination module 503 based on the fault detection parameter. The fault state of the urea nozzle can be timely and effectively detected, so that the fault can be timely removed, the waste of urea caused by frequent urea injection can be avoided, and NO in the vehicle tail gas caused by NO urea injection or less urea injection amount can be avoided x And the emission exceeds the standard.
Optionally, the fault states include a blocking fault state and a normal spraying fault state, and the second determining module 503 is configured to:
under the condition that the fault detection parameter is less than or equal to a first preset parameter threshold value, determining that the urea nozzle is in the blocking fault state; or,
and under the condition that the fault detection parameter is larger than or equal to a second preset parameter threshold value, determining that the urea nozzle is in the normal-spraying fault state.
FIG. 6 is a block diagram of a urea nozzle failure detection device according to the embodiment shown in FIG. 5; referring to fig. 6, the urea nozzle includes a solenoid valve, and the apparatus may further include:
a self-cleaning module 504 for self-cleaning by any one of the following means in case it is determined that the urea nozzle is in a malfunctioning state:
increasing the opening frequency of the solenoid valve;
or,
and increasing the valve opening force and/or the valve closing force of the electromagnetic valve.
According to the technical scheme, the opening frequency of the electromagnetic valve is increased; or, the valve opening force and/or the valve closing force of the electromagnetic valve are increased, so that the self-cleaning function can be effectively realized, and the effect of relieving or even removing the fault of the urea nozzle is achieved.
Optionally, the apparatus may further include:
a second acquisition module 505 for acquiring the duration of time that the urea nozzle is in a failure state;
and the alarm module 506 is configured to send out an alarm reminding message if the duration is determined to be greater than or equal to the preset time threshold.
According to the technical scheme, the duration of the urea nozzle in the fault state is obtained, and the alarm reminding message is sent out under the condition that the duration is determined to be greater than or equal to the preset time threshold, so that a vehicle user can be timely prompted to perform manual fault removal treatment under the condition that self-cleaning is invalid, the fault can be timely removed, the normal operation of the urea nozzle is ensured, and NO in the tail gas of the vehicle is avoided x Emissions exceeding and urea consumption exceeding.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 7 is a block diagram of an electronic device, according to an example embodiment. As shown in fig. 7, the electronic device 700 may include: a processor 701, a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
Wherein the processor 701 is configured to control the overall operation of the electronic device 700 to perform all or part of the steps in the urea nozzle failure detection method described above. The memory 702 is used to store various types of data to support operation on the electronic device 700, which may include, for example, instructions for any application or method operating on the electronic device 700, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, and so forth. The Memory 702 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 703 can include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 702 or transmitted through the communication component 705. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G or 4G, or a combination of one or more thereof, the corresponding communication component 705 may thus comprise: wi-Fi module, bluetooth module, NFC module.
In an exemplary embodiment, the electronic device 700 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated ASIC), digital signal processor (Digital Signal Processor, abbreviated DSP), digital signal processing device (Digital Signal Processing Device, abbreviated DSPD), programmable logic device (Programmable Logic Device, abbreviated PLD), field programmable gate array (Field Programmable Gate Array, abbreviated FPGA), controller, microcontroller, microprocessor, or other electronic components for performing the urea nozzle fault detection method described above.
In another exemplary embodiment, a computer readable storage medium is also provided comprising program instructions which, when executed by a processor, implement the steps of the urea nozzle failure detection method described above. For example, the computer readable storage medium may be the memory 702 including program instructions described above, which are executable by the processor 701 of the electronic device 700 to perform the urea nozzle failure detection method described above.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (8)
1. A urea nozzle failure detection method, characterized by being applied to a urea supply system in a vehicle, the urea supply system comprising a urea supply pump that injects urea of a target pressure through the urea nozzle, a rotational speed of the urea supply pump being inversely related to a pressure at the urea nozzle, the method comprising:
acquiring rotating speed information of a urea supply pump in a preset time period;
determining a fault detection parameter according to the rotation speed information, wherein the fault detection parameter is the average rotation speed in the preset time period or the rotation speed of the urea supply pump in the preset time period;
determining a fault state of the urea nozzle according to the fault detection parameter, wherein the fault state comprises a blocking fault state and a normal spraying fault state;
the determining the fault state of the urea nozzle according to the fault detection parameter comprises the following steps:
determining a first preset parameter threshold and a second preset parameter threshold according to a zero consumption rotational speed or a zero consumption rotational speed, wherein the zero consumption rotational speed is the rotational speed of the urea supply pump under the condition that the urea nozzle does not spray urea, and the zero consumption rotational speed is the rotational speed of the urea supply pump within the preset time period under the condition that the urea nozzle does not spray urea;
determining that the urea nozzle is in the clogged fault state if the fault detection parameter is determined to be less than or equal to the first preset parameter threshold, wherein the first preset parameter threshold is the zero consumption rotational speed of a first preset multiple or the first preset parameter threshold is the zero consumption rotational speed of a third preset multiple; or,
and under the condition that the fault detection parameter is larger than or equal to the second preset parameter threshold, determining that the urea nozzle is in the normal spraying fault state, wherein the second preset parameter threshold is the zero consumption rotating speed of a second preset multiple or the second preset parameter threshold is the zero consumption rotating speed of a fourth preset multiple.
2. The method of claim 1, wherein the urea nozzle comprises a solenoid valve, the method further comprising:
in case it is determined that the urea nozzle is in a failure state, self-cleaning is performed by any one of the following ways:
increasing the opening frequency of the electromagnetic valve;
or,
and increasing the valve opening force and/or the valve closing force of the electromagnetic valve.
3. The method according to any one of claims 1-2, wherein the method further comprises:
acquiring the duration time that the urea nozzle is in a fault state;
and under the condition that the duration time is larger than or equal to a preset time threshold value, sending out an alarm reminding message.
4. A urea nozzle failure detection apparatus, characterized by being applied to a urea supply system in a vehicle, the urea supply system including a urea supply pump that injects urea of a target pressure through the urea nozzle, a rotational speed of the urea supply pump being inversely related to a pressure at the urea nozzle, the apparatus comprising:
the first acquisition module is used for acquiring the rotating speed information of the urea supply pump in a preset time period;
the first determining module is used for determining a fault detection parameter according to the rotating speed information, wherein the fault detection parameter is the average rotating speed in the preset time period or the rotating speed of the urea supply pump in the preset time period;
the second determining module is used for determining the fault state of the urea nozzle according to the fault detection parameter, wherein the fault state comprises a blocking fault state and a normal spraying fault state;
the second determining module is configured to determine a first preset parameter threshold and a second preset parameter threshold according to a zero consumption rotational speed or a zero consumption rotational speed, where the zero consumption rotational speed is a rotational speed of the urea supply pump when the urea nozzle does not spray urea, and the zero consumption rotational speed is a rotational speed of the urea supply pump in the preset time period when the urea nozzle does not spray urea;
determining that the urea nozzle is in the clogged fault state if the fault detection parameter is determined to be less than or equal to the first preset parameter threshold, wherein the first preset parameter threshold is the zero consumption rotational speed of a first preset multiple or the first preset parameter threshold is the zero consumption rotational speed of a third preset multiple; or,
and under the condition that the fault detection parameter is larger than or equal to the second preset parameter threshold, determining that the urea nozzle is in the normal spraying fault state, wherein the second preset parameter threshold is the zero consumption rotating speed of a second preset multiple or the second preset parameter threshold is the zero consumption rotating speed of a fourth preset multiple.
5. The apparatus of claim 4, wherein the urea nozzle comprises a solenoid valve, the apparatus further comprising:
a self-cleaning module for self-cleaning by any one of the following means in case it is determined that the urea nozzle is in a faulty state:
increasing the opening frequency of the electromagnetic valve;
or,
and increasing the valve opening force and/or the valve closing force of the electromagnetic valve.
6. The apparatus according to any one of claims 4-5, further comprising:
a second acquisition module for acquiring the duration of time that the urea nozzle is in a failure state;
and the alarm module is used for sending out alarm reminding information under the condition that the duration time is determined to be greater than or equal to a preset time threshold value.
7. 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 steps of the method according to any of claims 1-3.
8. A vehicle comprising a urea nozzle failure detection device according to any of the preceding claims 4-6.
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