CN110905635B - Cleaning method and device for urea pump - Google Patents
Cleaning method and device for urea pump Download PDFInfo
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- CN110905635B CN110905635B CN201911232772.7A CN201911232772A CN110905635B CN 110905635 B CN110905635 B CN 110905635B CN 201911232772 A CN201911232772 A CN 201911232772A CN 110905635 B CN110905635 B CN 110905635B
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
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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)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides a cleaning method and a device of a urea pump, wherein the method comprises the following steps: after the power-on instruction is obtained, whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure build-up temperature of the urea pump or not is judged; when the upstream exhaust temperature in the aftertreatment box is judged to be lower than the pressure building temperature of the urea pump, the urea pump does not need to be used for spraying urea at the moment, and then a motor and a reversing valve in the urea pump are controlled to clean the urea pump in time. So as to achieve the purpose of preventing the filter screen of the liquid suction pipe joint of the urea pump from being blocked by impurities.
Description
Technical Field
The application relates to the technical field of tail gas treatment, in particular to a cleaning method and a cleaning device for a urea pump.
Background
At present, the aftertreatment technology of Selective Catalytic Reduction (SCR) is widely applied to vehicles in the fifth and sixth countries.
However, in the market verification process of the whole car in China, the filter screen of the liquid suction pipe joint of the urea pump is blocked by impurities, so that the urea pump cannot work under normal pressure, and even the SCR system fails.
Therefore, a method for cleaning the urea pump in time is needed to prevent the filter screen of the suction pipe joint of the urea pump from being blocked by impurities.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a method and an apparatus for cleaning a urea pump, which are used to prevent a filter screen of a suction pipe joint of the urea pump from being blocked by impurities.
In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:
the application provides a cleaning method of a urea pump in a first aspect, which comprises the following steps:
after a power-on instruction is obtained, judging whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure building temperature of the urea pump or not;
and when the upstream exhaust temperature in the aftertreatment box is judged to be lower than the pressure building temperature of the urea pump, controlling a motor and a reversing valve of the urea pump to clean the urea pump.
Optionally, the determining whether the upstream exhaust temperature in the aftertreatment tank is less than the build-up temperature of the urea pump includes:
acquiring the temperature of a temperature sensor arranged at the upstream of the post-processing box;
and judging whether the temperature of the temperature sensor arranged on the upstream of the aftertreatment box is lower than the pressure building temperature of the urea pump or not.
Optionally, the controlling a motor and a reversing valve in the urea pump to clean the urea pump includes:
controlling a motor of the urea pump to work at a first preset duty ratio for a first preset time;
controlling a motor of the urea pump to stop working for a second preset time;
and opening a reversing valve of the urea pump, and controlling a motor of the urea pump to work for a third preset time at a second preset duty ratio.
Optionally, before determining whether the upstream exhaust temperature in the aftertreatment box is less than the pressure buildup temperature of the urea pump, the method further includes:
judging whether the controller is successfully powered on;
if the controller is judged to be not successfully powered on, returning to execute the judgment of whether the controller is successfully powered on;
and if the controller is successfully electrified, judging whether the upstream exhaust temperature in the aftertreatment box is less than the pressure building temperature of the urea pump or not.
Optionally, after the urea pump is cleaned by controlling the motor and the reversing valve of the urea pump, the method further includes:
judging whether the upstream exhaust temperature in the aftertreatment box is smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value or not;
if the upstream exhaust temperature in the aftertreatment box is judged to be smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value, the controller continuously waits for a power-on instruction;
and if the upstream exhaust temperature in the aftertreatment box is judged to be greater than or equal to the difference value between the pressure building temperature and the preset temperature value of the urea pump, finishing cleaning the urea pump.
The present application provides in a second aspect a cleaning device for a urea pump, comprising:
the first judgment unit is used for judging whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure building temperature of the urea pump or not after the power-on instruction is obtained;
and the control unit is used for controlling a motor and a reversing valve of the urea pump to clean the urea pump when the first judgment unit judges that the upstream exhaust temperature in the aftertreatment box is less than the build-up pressure temperature of the urea pump.
Optionally, the first determining unit includes:
an acquisition unit for acquiring a temperature of a temperature sensor installed upstream of the post-processing tank;
and the first judgment subunit is used for judging whether the temperature of the temperature sensor arranged on the upstream of the aftertreatment box is less than the pressure building temperature of the urea pump or not.
Optionally, the control unit includes:
the first control unit is used for controlling a motor of the urea pump to work for a first preset time at a first preset duty ratio;
the second control unit is used for controlling a motor of the urea pump to stop working for a second preset time;
and the third control unit is used for opening a reversing valve of the urea pump and controlling a motor of the urea pump to work at a second preset duty ratio for a third preset time.
Optionally, the cleaning device for the urea pump further includes:
the second judgment unit is used for judging whether the controller is successfully electrified;
the first execution unit is used for returning to execute the judgment of whether the controller is successfully powered on or not if the controller is not successfully powered on as judged by the second judgment unit;
and the second execution unit is used for executing the judgment of whether the upstream exhaust temperature in the aftertreatment box is less than the pressure building temperature of the urea pump or not if the controller is successfully electrified as judged by the second judgment unit.
Optionally, the cleaning device for the urea pump further includes:
the third judgment unit is used for judging whether the upstream exhaust temperature in the aftertreatment box is smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value or not;
the waiting unit is used for continuously waiting for a power-on instruction by the controller if the upstream exhaust temperature in the aftertreatment box is smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value, which is judged by the third judging unit;
and the finishing unit is used for finishing the cleaning of the urea pump if the upstream exhaust temperature in the aftertreatment box is larger than or equal to the difference value between the pressure building temperature and the preset temperature value of the urea pump, which is judged by the third judging unit.
According to the scheme, in the cleaning method and the device for the urea pump, after the power-on instruction is obtained, whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure build-up temperature of the urea pump or not is judged; when the upstream exhaust temperature in the aftertreatment box is judged to be lower than the pressure building temperature of the urea pump, the urea pump does not need to be used for spraying urea at the moment, and then a motor and a reversing valve in the urea pump are controlled to clean the urea pump in time. So as to achieve the purpose of preventing the filter screen of the liquid suction pipe joint of the urea pump from being blocked by impurities.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for cleaning a urea pump according to an embodiment of the present disclosure;
FIG. 2 is a flow diagram illustrating a method for cleaning a urea pump according to another embodiment of the present disclosure;
FIG. 3 is a flow chart illustrating a method for cleaning a urea pump according to another embodiment of the present disclosure;
FIG. 4 is a flow chart illustrating a method for cleaning a urea pump according to another embodiment of the present disclosure;
FIG. 5 is a flow chart illustrating a method for cleaning a urea pump according to another embodiment of the present disclosure;
FIG. 6 is a schematic view of a cleaning apparatus for a urea pump according to another embodiment of the present disclosure;
fig. 7 is a schematic diagram of a first determining unit according to another embodiment of the present application;
FIG. 8 is a schematic diagram of a control unit according to another embodiment of the present application;
FIG. 9 is a schematic view of a cleaning apparatus for a urea pump according to another embodiment of the present disclosure;
FIG. 10 is a schematic diagram of a cleaning apparatus for a urea pump according to another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first", "second", and the like, referred to in this application, are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of functions performed by these devices, modules or units, but the terms "include", or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements that are not explicitly listed, or includes elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a cleaning method of a urea pump, as shown in fig. 1, the method comprises the following steps:
s101, after a power-on command is obtained, whether the upstream exhaust temperature in the aftertreatment box is smaller than the pressure building temperature of the urea pump or not is judged.
The power-on instruction can be sent by a user through a key, or can be sent automatically when the system judges that the controller can be powered on currently under certain conditions. The method is not limited herein, and can be selected according to actual situations.
However, it should be noted that the power-on instruction may be understood as a signal, and the controller may not directly execute the power-on operation after receiving the power-on instruction, and may perform a certain determination after receiving the power-on instruction, such as whether the current controller meets the power-on requirement, or the like, and if the controller does not meet the power-on requirement, the controller rejects the power-on instruction, i.e., rejects the power-on operation.
The upstream exhaust temperature of the aftertreatment tank is the temperature of the exhaust immediately after the engine or the temperature before the exhaust treatment is not performed.
Generally, after a vehicle runs, when the exhaust temperature reaches 180 ℃, the urea pump starts to operate to build pressure, when the pressure reaches 9bar, the urea pump stops rotating, the urea nozzle is opened to test injection once, and fault diagnosis is performed on mechanical clamping stagnation of the urea nozzle; and then monitoring the pressure fluctuation range in a period of time, judging whether the pipeline has leakage, and if the pressure build-up fails due to leakage or blockage, stopping the operation of the urea pump. The exhaust temperature 180 ℃ is the pressure build-up temperature of the urea pump mentioned in the embodiment of the present application, but the pressure build-up temperature may be different for different urea pumps, so the temperature is not limited here.
Specifically, the temperature of the temperature sensor installed upstream of the aftertreatment tank and the pressure buildup temperature of the urea pump can be compared by a simplest addition and subtraction calculation, which is not limited herein. If the upstream exhaust temperature in the aftertreatment box is judged to be less than the pressure building temperature of the urea pump, executing step S102; if the upstream exhaust temperature in the aftertreatment box is judged to be greater than or equal to the pressure buildup temperature of the urea pump, the step S102 is executed when the upstream exhaust temperature in the aftertreatment box is continuously waited to be less than the pressure buildup temperature of the urea pump, namely the urea pump does not inject urea.
Optionally, in another embodiment of the present application, an implementation manner of step S101, as shown in fig. 2, includes the following steps:
s201, acquiring the temperature of a temperature sensor arranged at the upstream of the post-processing box.
Specifically, temperature data in a temperature sensor mounted at a specified position upstream of the aftertreatment box in advance is acquired; the upstream designated position of the post-processing box is the best position calculated through actual practice and expert groups, the designated positions of different post-processing boxes for installing the temperature sensors can be different, installation can be carried out according to the actual conditions of the post-processing boxes, and the position is not limited.
S202, judging whether the temperature of a temperature sensor arranged on the upstream of the aftertreatment box is lower than the pressure building temperature of the urea pump or not.
Specifically, the temperature of the temperature sensor installed at the upstream of the aftertreatment box and the pressure buildup temperature of the urea pump can be compared through a simplest addition and subtraction calculation, and the comparison is not limited herein; if the upstream exhaust temperature in the aftertreatment box is judged to be less than the pressure building temperature of the urea pump, executing step S102; if the upstream exhaust temperature in the aftertreatment box is judged to be greater than or equal to the pressure buildup temperature of the urea pump, the step S102 is executed when the upstream exhaust temperature in the aftertreatment box is continuously waited to be less than the pressure buildup temperature of the urea pump, namely the urea pump does not inject urea.
And S102, controlling a motor and a reversing valve of the urea pump to clean the urea pump.
Specifically, a motor and a reversing valve in the urea pump are controlled to control the urea pump to suck liquid for multiple times and empty the liquid, so that impurities in a filter screen of a liquid suction pipe joint of the urea pump are discharged.
Optionally, in another embodiment of the present application, an implementation manner of the step S102, as shown in fig. 3, includes the following steps:
s301, controlling a motor of the urea pump to work for a first preset time at a first preset duty ratio.
Specifically, a motor of the urea pump is controlled to work for a first preset time according to a first preset duty ratio, so that the purpose that the urea pump is filled with urea is achieved.
It should be noted that, in an actual application process, because the types of the urea pumps are different, and the time for filling the urea is also different, no matter the first preset duty ratio or the first preset time, the time needs to be determined according to the actual type of the urea pump, and the determination is not limited herein.
And S302, controlling a motor of the urea pump to stop working for a second preset time.
The second preset time for stopping the motor in the urea pump is controlled to stop the urea in the urea pump.
And S303, opening a reversing valve of the urea pump, and controlling a motor of the urea pump to work for a third preset time at a second preset duty ratio.
Specifically, a reversing valve of the urea pump is controlled to be opened through a controller, and after the reversing valve is opened, a motor of the urea pump is controlled to work for a third preset time at a second preset duty ratio, so that urea in the urea pump can backflush impurities in a filter screen of a joint of the urea pipe.
It should be noted that, no matter the second preset duty ratio or the third preset time, the adjustment may be performed according to the actual condition of the urea pump, and the adjustment is not limited herein.
It should be further noted that the first preset duty cycle and the second preset duty cycle have no magnitude relationship and can be adjusted according to actual conditions, that is, the first preset duty cycle may be larger than the second preset duty cycle, the first preset duty cycle may be consistent with the second preset duty cycle, and the first preset duty cycle may be smaller than the second preset duty cycle; similarly, the first preset time, the second preset time and the third preset time may also be adjusted according to the actual situation, and are not further described here.
According to the scheme, in the cleaning method of the urea pump, after the power-on instruction is obtained, whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure build-up temperature of the urea pump or not is judged; when the upstream exhaust temperature in the aftertreatment box is judged to be lower than the pressure building temperature of the urea pump, the urea pump does not need to be used for spraying urea at the moment, and then a motor and a reversing valve in the urea pump are controlled to clean the urea pump in time. So as to achieve the purpose of preventing the filter screen of the liquid suction pipe joint of the urea pump from being blocked by impurities.
Optionally, in another embodiment of the present application, before determining whether the upstream exhaust temperature in the aftertreatment tank is less than the pressure buildup temperature of the urea pump in step S101, as shown in fig. 4, the method further includes the following steps:
s401, whether the controller is successfully powered on is judged.
Specifically, if it is determined that the controller is not successfully powered on, the step S401 is returned to be executed again; if the controller is successfully powered on, step S402 is executed.
It should be noted that a preset number of times of determination may also be set, such as 3 times, 5 times, and 10 times, which is not limited herein. When the controller exceeds the preset judgment frequency and is not normally powered on, an alarm signal needs to be sent to the server to prompt that the current controller possibly fails and needs to be overhauled. The judgment interval of each time can also be set according to actual conditions, such as 5S, 7S, 30S, and the like, which is not limited herein.
S402, judging whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure building temperature of the urea pump or not.
It should be noted that, the specific implementation method of step S402 is shown as an example in step S101, and is not described herein again.
Optionally, in another embodiment of the present application, after step S102, as shown in fig. 5, the method further includes the following steps:
s501, judging whether the upstream exhaust temperature in the aftertreatment box is smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value.
The preset temperature value is used for avoiding emission risks when the urea pump cannot complete pressure build-up in time, namely a buffer temperature is set for the urea pump, and the preset buffer temperature can be changed according to actual conditions or research results and is not limited here.
Specifically, if the upstream exhaust temperature in the aftertreatment box is judged to be smaller than the difference between the pressure build-up temperature of the urea pump and the preset temperature value, step S502 is executed; if the upstream exhaust temperature in the aftertreatment box is judged to be greater than or equal to the difference between the pressure build-up temperature of the urea pump and the preset temperature value, step S503 is executed.
S502, the controller continuously waits for a power-on instruction.
S503, finishing the cleaning of the urea pump.
Another embodiment of the present application provides a cleaning apparatus for a urea pump, as shown in fig. 6, the apparatus including:
the first judgment unit 601 is configured to judge whether an upstream exhaust temperature in the aftertreatment box is less than a pressure buildup temperature of the urea pump after the power-on instruction is acquired.
Optionally, in another embodiment of the present application, an implementation manner of the first determining unit 601, as shown in fig. 7, includes:
an acquisition unit 701 for acquiring the temperature of a temperature sensor mounted upstream of the post-processing tank.
A first judgment subunit 702 is configured to judge whether or not the temperature of a temperature sensor installed upstream of the aftertreatment tank is less than the pressure buildup temperature of the urea pump.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 2, which is not described herein again.
And the control unit 602 is configured to control a motor and a reversing valve of the urea pump to clean the urea pump when the first judgment unit 601 judges that the upstream exhaust temperature in the aftertreatment box is less than the build-up pressure temperature of the urea pump.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 1, which is not described herein again.
Optionally, in another embodiment of the present application, an implementation manner of the control unit 602, as shown in fig. 8, includes:
the first control unit 801 is configured to control a motor of the urea pump to operate at a first preset duty ratio for a first preset time.
And a second control unit 802, configured to control a motor of the urea pump to stop working for a second preset time.
And a third control unit 803 for opening the reversing valve of the urea pump and controlling the motor of the urea pump to operate at the second preset duty ratio for a third preset time.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 3, which is not described herein again.
According to the scheme, in the cleaning device for the urea pump, after the first judging unit 601 obtains the power-on instruction, whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure building temperature of the urea pump is judged; when the upstream exhaust temperature in the aftertreatment box is judged to be lower than the pressure build-up temperature of the urea pump, the urea pump is not needed to be used for spraying urea at the moment, and then the control unit 602 is used for controlling the motor and the reversing valve in the urea pump to clean the urea pump in time. So as to achieve the purpose of preventing the filter screen of the liquid suction pipe joint of the urea pump from being blocked by impurities.
Optionally, in another embodiment of the present application, as shown in fig. 9, the cleaning apparatus for a urea pump further includes:
a second determining unit 901, configured to determine whether the controller is powered on successfully.
A first executing unit 902, configured to, if the second determining unit 901 determines that the controller is not successfully powered on, continuously determine whether the controller is successfully powered on by the second determining unit 901.
And a second executing unit 903, configured to execute, if the second determining unit 901 determines that the controller is successfully powered on, determining whether the upstream exhaust temperature in the aftertreatment box is less than the pressure buildup temperature of the urea pump.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 4, which is not described herein again.
Optionally, in another embodiment of the present application, as shown in fig. 10, the cleaning device for a urea pump further includes:
a third determination unit 1001 configured to determine whether the upstream exhaust temperature in the aftertreatment tank is less than a difference between the pressure buildup temperature of the urea pump and a preset temperature value.
And a waiting unit 1002, configured to, if the third determining unit 1001 determines that the upstream exhaust temperature in the aftertreatment tank is less than the difference between the pressure buildup temperature of the urea pump and the preset temperature value, continuously wait for the power-on command by the controller.
And an ending unit 1003, configured to end cleaning of the urea pump if the third determining unit 1001 determines that the upstream exhaust temperature in the aftertreatment box is greater than or equal to a difference between the pressure buildup temperature of the urea pump and a preset temperature value.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 5, which is not described herein again.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method of cleaning a urea pump, comprising:
after a power-on instruction is obtained, judging whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure building temperature of the urea pump or not;
when the upstream exhaust temperature in the aftertreatment box is judged to be lower than the pressure building temperature of the urea pump, controlling a motor of the urea pump to work for a first preset time at a first preset duty ratio;
controlling a motor of the urea pump to stop working for a second preset time;
and opening a reversing valve of the urea pump, and controlling a motor of the urea pump to work for a third preset time at a second preset duty ratio.
2. The method of claim 1, wherein determining whether an upstream exhaust temperature in an aftertreatment tank is less than a build-up temperature of a urea pump comprises:
acquiring the temperature of a temperature sensor arranged at the upstream of the post-processing box;
and judging whether the temperature of the temperature sensor arranged on the upstream of the aftertreatment box is lower than the pressure building temperature of the urea pump or not.
3. The method of claim 1, wherein prior to determining whether the upstream exhaust temperature in the aftertreatment tank is less than the build-up temperature of the urea pump, further comprising:
judging whether the controller is successfully powered on;
if the controller is judged to be not successfully powered on, returning to execute the judgment of whether the controller is successfully powered on;
and if the controller is successfully electrified, judging whether the upstream exhaust temperature in the aftertreatment box is less than the pressure building temperature of the urea pump or not.
4. The method of claim 1, wherein after the controlling the motor and the reversing valve of the urea pump to purge the urea pump, further comprising:
judging whether the upstream exhaust temperature in the aftertreatment box is smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value or not;
if the upstream exhaust temperature in the aftertreatment box is judged to be smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value, the controller continuously waits for a power-on instruction;
and if the upstream exhaust temperature in the aftertreatment box is judged to be greater than or equal to the difference value between the pressure building temperature and the preset temperature value of the urea pump, finishing cleaning the urea pump.
5. A cleaning device for a urea pump, comprising:
the first judgment unit is used for judging whether the upstream exhaust temperature in the aftertreatment box is lower than the pressure building temperature of the urea pump or not after the power-on instruction is obtained;
the first control unit is used for controlling a motor of the urea pump to work at a first preset duty ratio for a first preset time when the first judgment unit judges that the upstream exhaust temperature in the aftertreatment box is less than the pressure build-up temperature of the urea pump;
the second control unit is used for controlling a motor of the urea pump to stop working for a second preset time;
and the third control unit is used for opening a reversing valve of the urea pump and controlling a motor of the urea pump to work at a second preset duty ratio for a third preset time.
6. The apparatus according to claim 5, wherein the first determining unit comprises:
an acquisition unit for acquiring a temperature of a temperature sensor installed upstream of the post-processing tank;
and the first judgment subunit is used for judging whether the temperature of the temperature sensor arranged on the upstream of the aftertreatment box is less than the pressure building temperature of the urea pump or not.
7. The apparatus of claim 5, further comprising:
the second judgment unit is used for judging whether the controller is successfully electrified;
the first execution unit is used for returning to execute the judgment of whether the controller is successfully powered on or not if the controller is not successfully powered on as judged by the second judgment unit;
and the second execution unit is used for executing the judgment of whether the upstream exhaust temperature in the aftertreatment box is less than the pressure building temperature of the urea pump or not if the controller is successfully electrified as judged by the second judgment unit.
8. The apparatus of claim 5, further comprising:
the third judgment unit is used for judging whether the upstream exhaust temperature in the aftertreatment box is smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value or not;
the waiting unit is used for continuously waiting for a power-on instruction by the controller if the upstream exhaust temperature in the aftertreatment box is smaller than the difference value between the pressure building temperature of the urea pump and a preset temperature value, which is judged by the third judging unit;
and the finishing unit is used for finishing the cleaning of the urea pump if the upstream exhaust temperature in the aftertreatment box is larger than or equal to the difference value between the pressure building temperature and the preset temperature value of the urea pump, which is judged by the third judging unit.
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