CN113700540B - Method for detecting blockage of heating electromagnetic valve of urea tank and engine - Google Patents
Method for detecting blockage of heating electromagnetic valve of urea tank and engine Download PDFInfo
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- CN113700540B CN113700540B CN202111074118.5A CN202111074118A CN113700540B CN 113700540 B CN113700540 B CN 113700540B CN 202111074118 A CN202111074118 A CN 202111074118A CN 113700540 B CN113700540 B CN 113700540B
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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]
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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
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a method for detecting blockage of a heating electromagnetic valve of a urea box and an engine, and relates to the technical field of engines. The urea case passes through the coolant liquid heating, and the heating solenoid valve is used for controlling whether coolant liquid and urea case communicate. The method for detecting the blockage of the heating electromagnetic valve of the urea box comprises the following steps: opening a heating electromagnetic valve to heat the urea box; detecting a first temperature rise rate of a urea solution in a urea tank; if the first temperature rise rate is smaller than the minimum temperature rise rate, increasing the flow of the cooling liquid; detecting a second temperature rise rate of the urea solution in the urea box; and if the second temperature rise rate is smaller than the minimum temperature rise rate, judging that the heating electromagnetic valve is blocked. The method for detecting the blockage of the heating electromagnetic valve of the urea box eliminates the phenomenon of slow temperature rise or no temperature rise of the urea box caused by small flow of the cooling liquid, and effectively reduces the misjudgment rate.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method for detecting blockage of a heating electromagnetic valve of a urea box and an engine.
Background
In order to ensure that the SCR system can be normally used in winter, the main scheme adopted at present is to heat and insulate a urea storage unit and corresponding pipelines, the heating modes of a urea box and a urea supply system are generally different, and the heating mode of cooling liquid flowing through a heating pipeline to perform heat convection with urea solution is adopted for heating the urea box at present. When the ECU judges that urea needs to be unfrozen (the temperature is lower than a set value) through the urea box temperature sensor and the environment temperature sensor, the ECU opens the heating electromagnetic valve, so that engine cooling liquid with higher temperature flows into the urea box heating pipeline to exchange heat with urea solution with lower temperature, and the urea solution near the liquid suction port of the urea box is kept in a liquid state.
Because the engine body contains some scrap irons or impurities, and the scrap irons or the impurities of small particles circulate in the heating pipeline of the urea box along with the cooling liquid and are deposited in the heating pipeline, small holes in the heating electromagnetic valve are easy to block, so that the heating electromagnetic valve is stuck to be out of control, and the unfreezing performance of the urea box is influenced. At present, a filter screen is added at a water inlet of a heating electromagnetic valve, but impurities can gradually block the filter screen along with the increase of the service time. When the filter screen is blocked, the cooling liquid with high temperature cannot enter the urea box, so that the temperature in the urea box does not rise, and the thawing fails.
In the method for detecting the blockage of the heating electromagnetic valve in the prior art, whether the heating electromagnetic valve is blocked is judged according to the temperature of the urea solution and the temperature change difference value, and the judgment result is reported to a driver to remind the driver to replace the heating electromagnetic valve in time. However, when the engine speed is low, the flow rate of the coolant flowing through the urea tank is small, and the temperature of the urea tank solution and the temperature change are slow, which may cause erroneous determination.
Disclosure of Invention
The invention aims to provide a method for detecting blockage of a heating electromagnetic valve of a urea box and an engine, which can reduce the misjudgment rate of the blockage of the heating electromagnetic valve.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting blockage of a heating electromagnetic valve of a urea tank, wherein the urea tank is heated by cooling liquid, the heating electromagnetic valve is used for controlling whether the cooling liquid is communicated with the urea tank, and the method for detecting blockage of the heating electromagnetic valve of the urea tank comprises the following steps:
opening the heating electromagnetic valve to heat the urea box;
detecting a first temperature rise rate of a urea solution in the urea tank;
if the first temperature rise rate is smaller than the minimum temperature rise rate, increasing the flow of the cooling liquid;
detecting a second temperature rise rate of the urea solution in the urea box;
and if the second temperature rise rate is smaller than the minimum temperature rise rate, judging that the heating electromagnetic valve is blocked.
As an alternative to the method of detecting clogging of the urea tank heating solenoid, the method of increasing the flow of coolant includes controlling a transmission downshift.
As an alternative to the detection method of clogging of the urea tank heating solenoid valve, the method of detecting the first rate of temperature rise includes:
detecting a first temperature of a urea solution in the urea tank before the heating solenoid valve is opened;
after the urea box is heated for a first preset time, detecting a second temperature of the urea solution in the urea box;
calculating a difference between the second temperature and the first temperature;
and calculating the ratio of the difference value of the second temperature and the first temperature to the first preset time.
As an alternative to the detection method of the clogging of the heating solenoid valve of the urea tank, the method of detecting the second temperature increase rate includes:
heating for a second preset time after the flow of the cooling liquid is increased, and detecting a third temperature of the urea solution in the urea box;
calculating a difference between the third temperature and the second temperature;
and calculating the ratio of the difference value of the third temperature and the second temperature to the second preset time.
As an alternative of the method for detecting the blockage of the heating solenoid valve of the urea tank, before the step of opening the heating solenoid valve, the method further comprises the following steps:
detecting the temperature of the cooling liquid;
and judging whether the temperature of the cooling liquid is greater than or equal to the lowest heating temperature, and if so, opening the heating electromagnetic valve.
As an alternative of the detection method for the blockage of the heating electromagnetic valve of the urea box, if the temperature of the cooling liquid is lower than the lowest heating temperature, the engine is controlled to continue to operate until the temperature of the cooling liquid is higher than or equal to the lowest heating temperature.
As an alternative of the detection method for the blockage of the heating electromagnetic valve of the urea box, when the blockage of the heating electromagnetic valve is judged, a fault prompt is sent.
An engine comprises an ECU and an SCR system, wherein the SCR system comprises a heating electromagnetic valve and a urea box, and the ECU is electrically connected with the heating electromagnetic valve and used for controlling the heating electromagnetic valve to be opened or closed; the heating electromagnetic valve is connected with a heating pipeline in the urea box and used for controlling whether cooling liquid is communicated with the heating pipeline in the urea box or not, and the heating electromagnetic valve detects whether the heating electromagnetic valve is blocked by adopting the method for detecting the blockage of the urea box heating electromagnetic valve according to any scheme.
As an alternative of the engine, the engine further comprises a urea solution temperature sensor in communication with the ECU, the urea solution temperature sensor being capable of sending the detected temperature of the urea solution in the urea tank to the ECU.
As an alternative to the engine, the engine further comprises a coolant temperature sensor in communication with the ECU, the coolant temperature sensor being capable of sending the detected coolant temperature to the ECU.
The invention has the beneficial effects that:
according to the method for detecting blockage of the heating electromagnetic valve of the urea box, the urea box is heated through cooling liquid, and the heating electromagnetic valve is used for controlling whether the cooling liquid is communicated with the urea box or not. After the heating electromagnetic valve is opened to heat the urea box, judging whether the first temperature rise rate is smaller than the minimum temperature rise rate or not by detecting the first temperature rise rate of the urea solution in the urea box, and if so, increasing the flow of the cooling liquid; and then detecting a second temperature rise rate of the urea solution in the urea box, and if the second temperature rise rate is still smaller than the minimum temperature rise rate, judging that the heating electromagnetic valve is blocked. The detection method for the blockage of the heating electromagnetic valve of the urea box eliminates the phenomenon that the temperature of the urea box is slow or does not rise due to small flow of the cooling liquid, and effectively reduces the misjudgment rate.
The engine provided by the invention comprises an ECU (electronic control unit) and an SCR (selective catalytic reduction) system, wherein the SCR system comprises a heating electromagnetic valve and a urea box, the heating electromagnetic valve is connected with a heating pipeline in the urea box, and the heating electromagnetic valve is controlled by the ECU to communicate cooling liquid with the heating pipeline in the urea box, so that urea solution in the urea box is heated, the urea solution is prevented from being frozen, and the emission of engine gas is prevented from being influenced. The heating electromagnetic valve detects whether the urea box is blocked by adopting the method for detecting the blockage of the urea box heating electromagnetic valve, so that the misjudgment rate of the blockage of the heating electromagnetic valve is reduced, the urea solution is effectively prevented from being frozen due to the blockage of the heating electromagnetic valve, and the gas emission performance of an engine is improved.
Drawings
FIG. 1 is a flowchart of a method for detecting clogging of a heating solenoid valve of a urea tank according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment provides an engine, which comprises an ECU and an SCR system, wherein the SCR system comprises a heating electromagnetic valve and a urea box, and the ECU is electrically connected with the heating electromagnetic valve and used for controlling the heating electromagnetic valve to be opened or closed. The heating electromagnetic valve is connected with a heating pipeline in the urea box and used for controlling whether the cooling liquid is communicated with the heating pipeline in the urea box or not, and the heating electromagnetic valve detects whether the heating electromagnetic valve is blocked or not by adopting a detection method of the blockage of the urea box heating electromagnetic valve, so that iron chips or small particles of impurities in an engine body are prevented from circulating in the heating pipeline of the urea box along with the cooling liquid, small holes in the heating electromagnetic valve are blocked, and the unfreezing performance of the urea solution in the urea box is influenced.
The engine still includes ambient temperature sensor, coolant liquid temperature sensor and urea solution temperature sensor, coolant liquid temperature sensor, ambient temperature sensor and urea solution temperature sensor all are connected with the ECU communication, and ambient temperature sensor can send the ambient temperature who detects for ECU, and coolant liquid temperature sensor can send the coolant liquid temperature that detects for ECU, and urea solution temperature sensor can send the urea solution's of the urea case that detects temperature for ECU. The ECU judges whether the urea box needs to be heated or not according to the received environment temperature and the urea solution temperature, and judges whether the temperature of the cooling liquid reaches the lowest heating temperature for heating the urea box or not according to the received temperature of the cooling liquid.
Generally, the temperature of the urea solution is not greatly different from the ambient temperature, the freezing point temperature of the urea solution is about minus 11 ℃, and when the ambient temperature and/or the temperature of the urea solution received by the ECU are less than or equal to minus 11 ℃ and the temperature of the cooling liquid reaches the lowest heating temperature for heating the urea box, the heating electromagnetic valve is controlled to be opened to heat the urea box.
And if the temperature of the cooling liquid is lower than the lowest heating temperature for heating the urea box, controlling the engine to operate until the temperature of the cooling liquid is higher than or equal to the lowest heating temperature.
The engine that this embodiment provided, heating solenoid valve and the heating pipeline in the urea case are connected, through ECU control heating solenoid valve to with the heating pipeline intercommunication in coolant liquid and the urea case, thereby for the urea solution heating in the urea case, prevent that the urea solution from freezing, influence the gaseous emission of engine. The heating electromagnetic valve detects whether the urea box is blocked by adopting a detection method for detecting the blockage of the urea box heating electromagnetic valve, so that the misjudgment rate of the blockage of the heating electromagnetic valve is reduced, the urea solution is effectively prevented from being frozen due to the blockage of the heating electromagnetic valve, and the gas emission performance of an engine is improved.
As shown in fig. 1, the embodiment further provides a method for detecting blockage of a heating solenoid valve of a urea tank, which is applied to the engine, and the method for detecting blockage of the heating solenoid valve of the urea tank includes the following steps:
and S10, controlling the engine to operate.
Heat generated by the operation of the engine exchanges heat with the urea tank through the cooling liquid so as to improve the temperature of the urea solution in the urea tank.
And S20, detecting the temperature of the cooling liquid.
And when the ECU receives that the temperature of the environment temperature sensor and/or the urea solution temperature sensor is lower than the freezing point temperature of the urea solution by-11 ℃, detecting the temperature of the cooling liquid and determining whether the heating electromagnetic valve can be opened.
S30, judging whether the temperature of the cooling liquid is greater than or equal to the lowest heating temperature, and if so, executing S40; if not, the process returns to S10.
Minimum heating temperature's injectment for the temperature of the coolant liquid that gets into the heating pipeline of urea case can realize with the quick heat transfer of urea case, avoids crossing lowly because of the temperature of coolant liquid, and the temperature rise rate of the urea solution temperature that causes is low, influences the judgement whether jam to the heating solenoid valve. The minimum heating temperature is not limited herein, and may be 20 ℃, 30 ℃, 40 ℃ or the like, and can be obtained by calibration by a person skilled in the art.
When the temperature of the cooling liquid detected by the cooling liquid temperature sensor received by the ECU is lower than the lowest heating temperature, the engine is controlled to continuously run for a preset time, the temperature of the cooling liquid is increased, and therefore the heat exchange efficiency of the cooling liquid and the urea box is guaranteed.
And S40, opening a heating electromagnetic valve to heat the urea box.
When the ECU receives the temperature of the cooling liquid detected by the cooling liquid temperature sensor and is greater than or equal to the lowest heating temperature, the heating electromagnetic valve is controlled to be opened, so that the cooling liquid is communicated with the heating pipeline in the urea box and enters the heating pipeline of the urea box, and the urea box is heated.
S50, detecting a first temperature rise rate of the urea solution in the urea box.
In this embodiment, the method of detecting the first temperature-rise rate includes:
s51, detecting a first temperature of a urea solution in a urea tank before a heating electromagnetic valve is opened;
s52, after the urea box is heated for a first preset time, detecting a second temperature of the urea solution in the urea box;
s53, calculating the difference value between the second temperature and the first temperature;
and S54, calculating the ratio of the difference between the second temperature and the first temperature to the first preset time.
The urea solution temperature sensor monitors the temperature of the urea solution in real time and sends the temperature to the ECU, the ECU calculates the difference value between the second temperature and the first temperature according to the received first temperature and the second temperature, and calculates the ratio of the difference value between the second temperature and the first temperature to the set first preset time so as to obtain the first temperature rise rate.
And S60, if the first temperature rise rate is smaller than the minimum temperature rise rate, increasing the flow of the cooling liquid.
The method of increasing the flow of coolant in this embodiment includes controlling a transmission downshift. When the gearbox is downshifted, the rotating speed of the engine is increased, and the water flow of the water pump for providing the cooling liquid is increased after the rotating speed of the engine is increased. Therefore, the flow of the cooling liquid flowing into the heating pipeline of the urea box is increased, after the flow of the cooling liquid is increased, the heat exchange efficiency with the urea box is improved, and if the heating electromagnetic valve is not blocked, the temperature rise rate can be increased.
In this embodiment, when the first temperature rise rate is smaller than the minimum temperature rise rate, the ECU obtains the temperature of the coolant at this time, when the temperature of the coolant is greater than or equal to the minimum heating temperature, the ECU sends a downshift request to the transmission, and after the transmission receives the downshift request of the ECU, the transmission is controlled to downshift so as to increase the rotation speed of the engine.
In the embodiment, the gearbox is an AMT gearbox, and is an electromechanical-hydraulic integrated automatic transmission which integrates the advantages of AT (automatic) and MT (manual); the AMT gearbox not only has the advantage of automatic speed change of the hydraulic automatic transmission, but also keeps the advantages of high efficiency, low cost, simple structure and easy manufacture of the gear transmission of the original manual transmission. After receiving the downshift request of the ECU through the AMT gearbox, the automatic downshift can be realized.
If the first temperature rise rate is larger than or equal to the minimum temperature rise rate, it is judged that the heating electromagnetic valve is not blocked, the engine can normally run, and the SCR system can normally work.
In this embodiment, the minimum temperature rise rate is calibrated by those skilled in the art.
And S70, detecting the second temperature rise rate of the urea solution in the urea box.
The method for detecting the second temperature rise rate comprises the following steps:
s71, heating for a second preset time after the flow of the cooling liquid is increased, and detecting a third temperature of the urea solution in the urea box;
s72, calculating the difference value between the third temperature and the second temperature;
and S73, calculating the ratio of the difference value of the third temperature and the second temperature to a second preset time.
And the ratio of the difference value of the third temperature and the second temperature to the second preset time is the second temperature rise rate.
In the present embodiment, both the first temperature increase rate and the second temperature increase rate are calculated by the ECU.
The first preset time and the second preset time are not limited, and may be the same or different. The temperature of the cooling fluid and the ambient temperature can be set by one skilled in the art.
Of course, in other embodiments, the first temperature rise value in the first preset time and the second temperature rise value in the second preset time may also be detected. And judging whether the heating solenoid valve is blocked or not by comparing the first temperature-rise value and the second temperature-rise value with the minimum temperature-rise value.
And S80, if the second temperature rise rate is smaller than the minimum temperature rise rate, judging that the heating electromagnetic valve is blocked, and executing S90.
When the ECU detects that the second temperature rise rate is also smaller than the minimum temperature rise rate, the fact that the cooling liquid does not enter the heating pipeline in the urea box for heat exchange is indicated, or the cooling liquid entering the heating pipeline in the urea box for heat exchange is little, and the cooling liquid is not enough for unfreezing the urea solution. At this time, it can be judged that the heating solenoid valve is clogged.
According to the method for detecting blockage of the heating electromagnetic valve of the urea box, after the heating electromagnetic valve is opened to heat the urea box, whether the first temperature rise rate is smaller than the minimum temperature rise rate or not is judged by detecting the first temperature rise rate of urea solution in the urea box, and if yes, the flow of cooling liquid is increased; and then detecting a second temperature rise rate of the urea solution in the urea box, and if the second temperature rise rate is still smaller than the minimum temperature rise rate, judging that the electromagnetic valve is blocked. The method for detecting the blockage of the heating electromagnetic valve of the urea box eliminates the phenomenon of slow temperature rise or no temperature rise of the urea box caused by small flow of the cooling liquid, and effectively reduces the misjudgment rate.
And S90, sending a fault prompt.
And when the ECU judges that the heating electromagnetic valve has a fault, sending a fault prompt to a driver to remind the driver to replace the heating electromagnetic valve in time so as to ensure the normal operation of the SCR system.
The above description is only a preferred embodiment of the present invention, and it should not be understood that the present invention is limited to the details of the embodiment and the range of applications, which can be changed by those skilled in the art according to the spirit of the present invention.
Claims (10)
1. A method for detecting blockage of a heating electromagnetic valve of a urea box, wherein the urea box is heated by cooling liquid, and the heating electromagnetic valve is used for controlling whether the cooling liquid is communicated with the urea box, and is characterized by comprising the following steps:
opening the heating electromagnetic valve to heat the urea box;
after the urea box is heated for a first preset time, detecting a first temperature rise rate of a urea solution in the urea box;
if the first temperature rise rate is smaller than the minimum temperature rise rate, increasing the flow of the cooling liquid;
heating for a second preset time after the flow of the cooling liquid is increased, and then detecting a second temperature rise rate of the urea solution in the urea box;
and if the second temperature rise rate is smaller than the minimum temperature rise rate, judging that the heating electromagnetic valve is blocked.
2. The method of claim 1, wherein the method of increasing the flow of the cooling fluid comprises controlling a transmission downshift.
3. The method of claim 1, wherein the step of detecting the first rate of temperature rise comprises:
detecting a first temperature of a urea solution in the urea tank before the heating solenoid valve is opened;
after the urea box is heated for the first preset time, detecting a second temperature of the urea solution in the urea box;
calculating a difference between the second temperature and the first temperature;
and calculating the ratio of the difference value of the second temperature and the first temperature to the first preset time.
4. The method for detecting the blockage of the heating solenoid valve of the urea tank as recited in claim 3, wherein the method for detecting the second temperature rise rate comprises the following steps:
heating for the second preset time after the flow of the cooling liquid is increased, and detecting a third temperature of the urea solution in the urea box;
calculating a difference between the third temperature and the second temperature;
and calculating the ratio of the difference value of the third temperature and the second temperature to the second preset time.
5. The method of claim 1, further comprising, before the step of opening the heating solenoid valve, the step of:
detecting the temperature of the cooling liquid;
and judging whether the temperature of the cooling liquid is greater than or equal to the lowest heating temperature, and if so, opening the heating electromagnetic valve.
6. The method for detecting the blockage of the heating solenoid valve of the urea tank as recited in claim 5, wherein if the temperature of the cooling liquid is lower than the minimum heating temperature, the engine is controlled to continue to operate until the temperature of the cooling liquid is higher than or equal to the minimum heating temperature.
7. The method for detecting clogging of a heating solenoid valve of a urea tank as claimed in claim 6, wherein a failure notice is sent when it is determined that the heating solenoid valve is clogged.
8. An engine is characterized by comprising an ECU and an SCR system, wherein the SCR system comprises a heating electromagnetic valve and a urea box, and the ECU is electrically connected with the heating electromagnetic valve and used for controlling the heating electromagnetic valve to be opened or closed; the heating electromagnetic valve is connected with a heating pipeline in the urea box and used for controlling whether cooling liquid is communicated with the heating pipeline in the urea box or not, and the heating electromagnetic valve detects whether the heating electromagnetic valve is blocked or not by adopting the method for detecting the blockage of the urea box heating electromagnetic valve as claimed in any one of claims 1 to 7.
9. The engine of claim 8, further comprising a urea solution temperature sensor in communication with the ECU, the urea solution temperature sensor capable of sending the sensed temperature of the urea solution in the urea tank to the ECU.
10. The engine of claim 8, further comprising a coolant temperature sensor in communication with the ECU, the coolant temperature sensor capable of sending the detected coolant temperature to the ECU.
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|---|---|---|---|---|
| JP5712515B2 (en) * | 2010-07-14 | 2015-05-07 | いすゞ自動車株式会社 | NOx sensor temperature raising device |
| CN105298606B (en) * | 2015-11-12 | 2018-03-09 | 潍柴动力股份有限公司 | A kind of switch electromagnetic valve fault alarm method and device |
| CN108518265B (en) * | 2018-03-29 | 2020-07-28 | 潍柴动力股份有限公司 | System and method for judging mechanical failure of urea heating electromagnetic valve and automobile |
| CN111894705B (en) * | 2020-07-24 | 2021-05-28 | 东风商用车有限公司 | Urea heating and unfreezing control method based on temperature model |
| CN112347618B (en) * | 2020-10-21 | 2023-03-31 | 潍柴动力股份有限公司 | Method and device for determining urea thawing efficiency and storage medium |
| CN112554998B (en) * | 2020-11-30 | 2022-08-30 | 潍柴动力股份有限公司 | Anti-adhesion control method and device for urea box heating electromagnetic valve and storage medium |
| CN112782219A (en) * | 2020-12-29 | 2021-05-11 | 广东普门生物医疗科技有限公司 | Method and device for detecting ventilation performance of ventilation pipe, storage medium and warming blanket |
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