CN113202606A - Control method and control system for unfreezing urea pump - Google Patents
Control method and control system for unfreezing urea pump Download PDFInfo
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- CN113202606A CN113202606A CN202110499691.4A CN202110499691A CN113202606A CN 113202606 A CN113202606 A CN 113202606A CN 202110499691 A CN202110499691 A CN 202110499691A CN 113202606 A CN113202606 A CN 113202606A
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- urea pump
- urea
- temperature
- pressure
- unfreezing
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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
- 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
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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
- 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
- F01N2610/1486—Means to prevent the substance from freezing
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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
- Y02T10/12—Improving ICE efficiencies
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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)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention belongs to the technical field of engines, and particularly relates to a control method and a control system for unfreezing a urea pump. The control method for unfreezing the urea pump comprises the following steps: acquiring a first temperature of a urea pump; controlling the urea pump to unfreeze according to the condition that the first temperature of the urea pump is lower than a first preset temperature value; acquiring the pressure of a urea pump; controlling the unfreezing completion temperature of the urea pump to rise according to the fact that the pressure of the urea pump is larger than a preset pressure value; wherein, the first preset temperature value is the temperature of the frozen urea pump. According to the control method for unfreezing the urea pump, when the first temperature of the urea pump is lower than the first preset temperature value, the urea pump is in an incomplete unfreezing state, the urea pump is controlled to unfreeze at the moment, the pressure of the urea pump is obtained at the same time, if the pressure of the urea pump is larger than the preset pressure value, the fact that urea remains in the urea pump is indicated, the unfreezing completion temperature of the urea pump is controlled to be increased, the urea pump is unfrozen fully, and therefore the problem that a system has a fault report due to the fact that the pressure in the urea pump is too high is avoided.
Description
Technical Field
The invention belongs to the technical field of tail gas treatment, and particularly relates to a control method and a control system for unfreezing a urea pump.
Background
The urea pump is an important component of the urea injection system, and has the main functions of pumping the urea solution in the urea tank, maintaining a certain pressure and then conveying the urea solution to the injection unit to meet the requirements of the injection metering system on flow and pressure.
The urea pump is often frozen when it is in a low temperature environment, and therefore, the urea pump needs to be thawed before use. If there is remaining urea in the urea pump, current urea pump unfreezing method is difficult to unfreeze the urea pump completely, can lead to the pressure of urea pump too high, and then the system can take place to report the mistake, and the user can misunderstand that the urea in the urea pump does not unfreeze the system that leads to completely and report the mistake trouble for urea pump hardware has the problem to lead to influence user experience.
Disclosure of Invention
The invention aims to at least solve the problem of more faults of the urea pump caused by unfreezing of urea. The purpose is realized by the following technical scheme:
the invention provides a control method for unfreezing a urea pump in a first aspect, which comprises the following steps:
acquiring a first temperature of a urea pump;
controlling the urea pump to unfreeze according to the condition that the first temperature of the urea pump is lower than a first preset temperature value;
acquiring the pressure of a urea pump;
controlling the unfreezing completion temperature of the urea pump to rise according to the fact that the pressure of the urea pump is larger than a preset pressure value;
wherein, the first preset temperature value is the temperature of the frozen urea pump.
According to the control method for unfreezing the urea pump, when the first temperature of the urea pump is lower than the first preset temperature value, the urea pump is controlled to unfreeze, the pressure of the urea pump is obtained simultaneously, if the pressure of the urea pump is larger than the preset pressure value, it is indicated that urea remains in the urea pump, and the unfreezing completion temperature of the urea pump is controlled to be increased, so that the urea pump is unfrozen fully, the problem that the system has error reporting faults due to overhigh pressure in the urea pump is avoided, the system fault error reporting times of the urea pump are reduced, and user experience is improved.
In addition, the method and the system for controlling the defrosting of the urea pump according to the embodiment of the invention may further have the following technical characteristics:
in some embodiments of the present invention, before the controlling the thawing completion temperature of the urea pump, the method further comprises the following steps:
and inquiring a map table of the pressure of the urea pump and the unfreezing completion temperature of the urea pump, and acquiring the unfreezing completion temperature of the urea pump after the pressure is increased.
In some embodiments of the present invention, after the controlling the thawing completion temperature of the urea pump to rise, the method further comprises the following steps:
acquiring a second temperature of the urea pump;
controlling the urea pump to stop unfreezing according to the fact that the second temperature of the urea pump is larger than or equal to a second preset temperature value;
and the second preset temperature is the temperature of the urea pump for stopping the unfreezing process.
In some embodiments of the present invention, after the controlling the urea pump to stop defrosting, the method further comprises the following steps:
obtaining the unfreezing state of the urea box;
and controlling to delay the pressure credibility diagnosis of the urea pump according to the unfreezing state of the urea box.
In some embodiments of the present invention, the controlling delays the pressure reliability diagnosis of the urea pump by specifically including the steps of:
obtaining the thawing completion temperature of the urea box;
and calculating the temperature of the urea box for pressure credibility diagnosis of the urea pump according to the thawing completion temperature of the urea box.
In some embodiments of the present invention, the urea tank temperature for pressure reliability diagnosis of the urea pump is calculated according to a thawing completion temperature of the urea tank, specifically according to the following formula:
the temperature of the urea box is equal to the unfreezing completion temperature of the urea box-a third temperature preset value
Wherein the third temperature preset value is a positive number.
In some embodiments of the present invention, the method further comprises the following steps, wherein the pressure according to the urea pump is greater than a preset pressure value:
the unfreezing time of the urea pump is controlled to be prolonged.
In some embodiments of the present invention, before the controlling the thawing time of the urea pump to be prolonged, the method further comprises the following steps:
and inquiring a map table of the pressure of the urea pump and the unfreezing time of the urea pump, and obtaining the prolonged unfreezing time of the urea pump.
A second aspect of the present invention provides a control system for defrosting a urea pump, the control system being configured to implement the control method for defrosting a urea pump according to any one of the above embodiments, the control system for defrosting a urea pump including:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first temperature of a urea pump and acquiring pressure of the urea pump;
and the control unit is used for controlling the urea pump to unfreeze according to the condition that the first temperature of the urea pump is smaller than a first preset temperature value, and is used for controlling the unfreezing completion temperature of the urea pump to rise according to the condition that the pressure of the urea pump is larger than a preset pressure value.
According to the control system for unfreezing the urea pump, the first temperature value of the urea pump is obtained through the obtaining unit, if the first temperature value is smaller than the first preset temperature value, the urea pump is controlled to unfreeze, meanwhile, the pressure of the urea pump is obtained through the obtaining unit, if the pressure of the urea pump is larger than the preset pressure value, it is indicated that residual urea exists in the urea pump, the control unit controls the unfreezing completion temperature of the urea pump to be increased, so that the urea pump is unfrozen fully, further, the error reporting fault of the system caused by the overhigh pressure in the urea pump is avoided, the system fault reporting times of the urea pump are reduced, and user experience is improved.
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 parts are designated by like reference numerals throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a control method for defrosting a urea pump 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" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "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.
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 a second 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 convenience 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 … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, an embodiment of a first aspect of the present invention proposes a control method for thawing a urea pump, including the steps of:
s10: acquiring a first temperature of a urea pump;
s20: controlling the urea pump to unfreeze according to the condition that the first temperature of the urea pump is lower than a first preset temperature value;
s30: acquiring the pressure of a urea pump;
s40: controlling the unfreezing completion temperature of the urea pump to rise according to the fact that the pressure of the urea pump is larger than a preset pressure value;
wherein, the first preset temperature value is the temperature of the frozen urea pump.
According to the control method for unfreezing the urea pump, when the first temperature of the urea pump is lower than the first preset temperature value, the urea pump is controlled to unfreeze, the pressure of the urea pump is obtained simultaneously, if the pressure of the urea pump is larger than the preset pressure value, it is indicated that urea remains in the urea pump, and the unfreezing completion temperature of the urea pump is controlled to be increased, so that the urea pump is unfrozen fully, the problem that the system has error reporting faults due to overhigh pressure in the urea pump is avoided, the system fault error reporting times of the urea pump are reduced, and user experience is improved.
In some embodiments of the present invention, before the controlling the thawing completion temperature of the urea pump, the method further comprises the following steps:
and inquiring a map table of the pressure of the urea pump and the unfreezing completion temperature of the urea pump, and acquiring the unfreezing completion temperature of the urea pump after the pressure is increased.
The pressure of the urea pump is correlated with the defrosting completion temperature of the urea pump, and the higher the pressure of the urea pump is, the more residual urea in the urea pump is, the higher the required defrosting completion temperature of the urea pump is, that is, the more the defrosting completion temperature of the urea pump needs to be corrected. And quickly obtaining the unfreezing completion temperature of the urea pump after rising by inquiring a map table of the preset pressure of the urea pump and the unfreezing completion temperature of the urea pump.
In some embodiments of the present invention, after the controlling the thawing completion temperature of the urea pump to rise, the method further comprises the following steps:
acquiring a second temperature of the urea pump;
controlling the urea pump to stop unfreezing according to the fact that the second temperature of the urea pump is larger than or equal to a second preset temperature value;
and the second preset temperature is the temperature of the urea pump for stopping the unfreezing process.
When the temperature of the urea pump reaches a second preset temperature value, the fact that the urea pump does not need to continue to unfreeze at the temperature is indicated, the urea pump is controlled to stop unfreezing at the moment, and the unfreezing of the urea pump is completed.
In some embodiments of the present invention, after the controlling the urea pump to stop defrosting, the method further comprises the following steps:
obtaining the unfreezing state of the urea box;
and controlling to delay the pressure credibility diagnosis of the urea pump according to the unfreezing state of the urea box.
After the urea pump is unfrozen, if the urea box is still in an unfrozen state, the pressure credibility diagnosis of the urea pump can be carried out immediately, when the urea box is about to be unfrozen, the pressure credibility diagnosis of the urea pump is carried out, so that the urea pump can be unfrozen in sufficient time, and the abnormal pressure report error of the urea pump is avoided when the pressure credibility diagnosis is carried out.
Further, the pressure reliability diagnosis of the control delay urea pump specifically includes the following steps:
obtaining the thawing completion temperature of the urea box;
and calculating the temperature of the urea box for pressure credibility diagnosis of the urea pump according to the thawing completion temperature of the urea box.
When the temperature of the urea box is close to the thawing completion temperature of the urea box, the pressure credibility diagnosis of the urea pump can be controlled, the sufficient thawing time of the urea pump can be provided by the diagnosis, the diagnosis after the urea box is thawed is also prevented, the pressure build-up of the urea pump is avoided being influenced, and the emission of pollutants is further reduced.
In some embodiments of the present invention, the urea tank temperature for pressure reliability diagnosis of the urea pump is calculated according to a thawing completion temperature of the urea tank, specifically according to the following formula:
the temperature of the urea box is equal to the unfreezing and unfreezing temperature-third preset temperature value of the urea box
Wherein the third temperature preset value is a positive number.
Specifically, the third temperature preset value may be 1 ℃, 0.5 ℃ or less, and the third temperature preset value is not specifically limited in this embodiment, as long as the pressure build of the urea pump is not affected, the thawing completion temperature closer to the urea tank is better, and a person skilled in the art can calibrate according to actual conditions.
In some embodiments of the present invention, the method further comprises the following steps, wherein the pressure according to the urea pump is greater than a preset pressure value:
the unfreezing time of the urea pump is controlled to be prolonged.
When the pressure of the urea pump is larger than the preset pressure value, the unfreezing time of the urea pump can be prolonged through control to control the unfreezing of the urea pump. A certain relation also exists between the pressure of the urea pump and the unfreezing time of the urea pump, and the larger the pressure of the urea pump is, the longer the unfreezing time required by the urea pump is. Specifically, before the thawing time of the urea pump is controlled to be prolonged, the thawing time of the urea pump after the control can be obtained by inquiring a map table of the pressure of the urea pump and the thawing time of the urea pump.
It should be noted that, in the embodiment of the present invention, the first preset temperature value is set according to the freezing temperature of the urea pump, the second preset temperature value is set according to the thawing completion temperature of the urea pump, and the third preset temperature value is set according to the thawing completion temperature of the urea pump, because the freezing temperature, the thawing temperature, and the thawing completion temperature of the urea pumps of different models are different, the first preset temperature value, the second preset temperature value, and the third preset temperature value are not limited by specific values in the embodiment, and a person skilled in the art can set different temperature values according to the model of the urea pump and his own requirements.
A second aspect of the present invention provides a control system for defrosting a urea pump, the control system being configured to implement the control method for defrosting a urea pump according to any one of the above embodiments, the control system for defrosting a urea pump including:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first temperature of a urea pump and acquiring pressure of the urea pump;
and the control unit is used for controlling the urea pump to unfreeze according to the condition that the first temperature of the urea pump is smaller than a first preset temperature value, and is used for controlling the unfreezing completion temperature of the urea pump to rise according to the condition that the pressure of the urea pump is larger than a preset pressure value.
According to the control system for unfreezing the urea pump, the first temperature value of the urea pump is obtained through the obtaining unit, if the first temperature value is smaller than the first preset temperature value, the urea pump is controlled to unfreeze, meanwhile, the pressure of the urea pump is obtained through the obtaining unit, if the pressure of the urea pump is larger than the preset pressure value, it is indicated that residual urea exists in the urea pump, the control unit controls the unfreezing completion temperature of the urea pump to be increased, so that the urea pump is unfrozen fully, further, the error reporting fault of the system caused by the overhigh pressure in the urea pump is avoided, the system fault reporting times of the urea pump are reduced, and user experience is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A control method for unfreezing a urea pump is characterized by comprising the following steps:
acquiring a first temperature of a urea pump;
controlling the urea pump to unfreeze according to the condition that the first temperature of the urea pump is lower than a first preset temperature value;
acquiring the pressure of a urea pump;
controlling the unfreezing completion temperature of the urea pump to rise according to the fact that the pressure of the urea pump is larger than a preset pressure value;
wherein, the first preset temperature value is the temperature of the frozen urea pump.
2. The method for controlling the defrosting of the urea pump according to claim 1, further comprising the following steps before the defrosting completion temperature of the urea pump is raised:
and inquiring a map table of the pressure of the urea pump and the unfreezing completion temperature of the urea pump, and acquiring the unfreezing completion temperature of the urea pump after the pressure is increased.
3. The method for controlling the defrosting of the urea pump according to claim 1, further comprising the following steps after the defrosting completion temperature of the urea pump is increased:
acquiring a second temperature of the urea pump;
controlling the urea pump to stop unfreezing according to the fact that the second temperature of the urea pump is larger than or equal to a second preset temperature value;
and the second preset temperature is the temperature of the urea pump for stopping the unfreezing process.
4. The method for controlling the defrosting of the urea pump according to claim 3, further comprising the step of, after the defrosting of the urea pump is stopped:
obtaining the unfreezing state of the urea box;
and controlling to delay the pressure credibility diagnosis of the urea pump according to the unfreezing state of the urea box.
5. The method of claim 4, wherein the controlling delays the pressure reliability diagnostic of the urea pump by:
obtaining the thawing completion temperature of the urea box;
and calculating the temperature of the urea box for pressure credibility diagnosis of the urea pump according to the thawing completion temperature of the urea box.
6. The method for controlling defrosting of a urea pump according to claim 5, wherein the urea tank temperature for pressure reliability diagnosis of the urea pump is calculated according to a defrosting temperature of the urea tank, and is specifically calculated according to the following formula:
the temperature of the urea box is equal to the unfreezing completion temperature of the urea box-a third temperature preset value
Wherein the third temperature preset value is a positive number.
7. The urea pump defrosting control method according to claim 1, wherein the urea pump defrosting control method further comprises the following steps according to the fact that the pressure of the urea pump is greater than a preset pressure value:
the unfreezing time of the urea pump is controlled to be prolonged.
8. The method for controlling the defrosting of the urea pump according to claim 7, further comprising the following steps before the defrosting time of the urea pump is prolonged:
and inquiring a map table of the pressure of the urea pump and the unfreezing time of the urea pump, and obtaining the prolonged unfreezing time of the urea pump.
9. A control system for thawing a urea pump, the control system being configured to implement the control method for thawing a urea pump according to claim 1, the control system comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first temperature of a urea pump and acquiring pressure of the urea pump;
and the control unit is used for controlling the urea pump to unfreeze according to the condition that the first temperature of the urea pump is smaller than a first preset temperature value, and is used for controlling the unfreezing completion temperature of the urea pump to rise according to the condition that the pressure of the urea pump is larger than a preset pressure value.
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