CN114876619B - Method for checking blockage reason of urea injection system - Google Patents
Method for checking blockage reason of urea injection system Download PDFInfo
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- CN114876619B CN114876619B CN202210580877.7A CN202210580877A CN114876619B CN 114876619 B CN114876619 B CN 114876619B CN 202210580877 A CN202210580877 A CN 202210580877A CN 114876619 B CN114876619 B CN 114876619B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1808—Pressure
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1818—Concentration of the reducing agent
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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 checking the blockage reason of a urea injection system, which comprises the following steps: checking the concentration of urea solution; if the concentration of the urea solution is checked to be normal, checking a urea pipe; if not, the urea nozzle crystallization inspection is carried out, and the method provides a corresponding inspection flow by inspecting factors possibly causing the blockage of the urea injection system, and finally finds out the reason for causing the blockage of the urea injection system.
Description
Technical field:
the invention relates to the technical field of tail gas treatment, in particular to a method for checking blockage reasons of a urea injection system.
The background technology is as follows:
with the continuous development and the enlargement of the automobile industry in China, the market share of commercial vehicles is also continuously promoted, and the demand and delivery of diesel engines serving as main power sources of the commercial vehicles are also increased year by year. The diesel engine has sufficient discharge capacity, excellent dynamic property and excellent fuel economy, and meanwhile, pollution to the environment is high, so that the problem to be solved is urgent for vehicle emission control in China, the national emission standard of the national VI stage is implemented on heavy diesel engines in the national range from 7 months 1 in 2019, and manufacturers often adopt an SCR tail gas treatment system to reduce emission in order to achieve the aim of reducing pollution in the working process of the diesel engine.
Selective Catalytic Reduction, SCR for short, is based on the principle that nitrogen oxides are selectively reduced to generate nitrogen and water under the oxygen-enriched condition by using a reducing agent under the action of a catalyst. The injection of urea in SCR adopts a closed-loop injection strategy to realize injection control in the steady state and transient state of the engine, and the urea injection quantity is adjusted and optimized through the operating parameters such as the engine speed, the fuel injection quantity, the exhaust flow, the exhaust temperature and the like.
During SCR operation, blockage of the urea injection system often occurs, which causes the problem that the urea pump cannot absorb liquid from the urea tank, thereby causing the urea pump to be unable to build up pressure normally. In the prior art, the blockage fault detection of the urea injection system is basically carried out according to the methods of an engine, a post-treatment parameter, a DNOX system state parameter or a pumping pressure test, and a specific troubleshooting method for the fault is not proposed.
For example, the application number is CN202210140011.4, and the name is a urea nozzle clogging judging method, an SCR system and a vehicle, which are used for judging whether the injection amount of the urea nozzle is normal or not, and if the injection amount of the urea nozzle is abnormal, proving that the urea nozzle injects less urea, namely, the urea nozzle is clogged. If the injection quantity is normal, carrying out the next step of judgment, judging whether the SCR conversion efficiency is lower than a calibration threshold value, if so, namely, if the SCR conversion efficiency is lower than the calibration threshold value, proving that the urea is not injected into a reaction container of the SCR system in a sufficient quantity, and further judging that a urea nozzle is blocked; if not, that is, the SCR conversion efficiency is greater than or equal to the calibration threshold, the sufficient amount of urea is proved to be injected into the reaction vessel of the SCR system, and then the urea nozzle is judged to be not blocked.
Therefore, a method for checking the blockage fault of the urea injection system is needed to find out the cause of the blockage of the injection system, so as to fundamentally solve the fault.
The invention comprises the following steps:
aiming at the defects existing in the prior art, the invention provides a method for checking the blockage reason of the urea injection system, and corresponding problem checking flows are provided for factors (urea solution concentration, urea pipe and urea nozzle) possibly causing the blockage of the urea injection system, so that the blockage reason of the injection system is found, and the problem is solved fundamentally.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the method for checking the blockage reason of the urea injection system comprises the following steps: checking the concentration of urea solution; if the concentration of the urea solution is checked to be normal, checking a urea pipe; if not, a urea nozzle crystallization check is performed.
As a further aspect of the present invention, the urea solution concentration check includes: checking the liquid level of the urea box, reading the refractive index of the urea solution by a refractometer, and detecting whether the urea solution contains oil or not by the oil test paper.
As a further scheme of the invention, in the process of checking, the liquid level of the urea box is maintained to be about 50%; and in the process of reading the refractive index by using the refractometer, if the refractive index is 28-62%, the corresponding urea concentration: 30.5% -34.5% if the urea solution concentration is found to be too low/too high: indicating that the urea solution is diluted with water/oil or left unused for a long period of time, a standard urea solution needs to be replaced; by using the test paper to detect urea solution, if the test paper changes color: indicating that the urea solution contains oil, a clean urea solution needs to be replaced and the SCR system cleaned.
As a further aspect of the present invention, the urea pipe inspection includes: shorting the pump to nozzle line with transparent tube, detecting pressure change in pressure drop stage; if the abnormality no longer occurs, checking whether the original vehicle pressure pipe is blocked, and if so, replacing the urea pipe.
As a further aspect of the present invention, the urea nozzle crystallization inspection includes: cleaning by using a constant water bath kettle, and setting the water bath temperature to be 85 ℃; sealing the electrical interface by using a plug to prevent water vapor from corroding the electrical interface; adding purified water for cleaning; capping and waiting for 30 minutes; closing a water bath power supply, taking out the nozzle, and immediately loading the nozzle for jet test; draining the sewage in the water bath kettle, and cleaning the water bath kettle.
The invention has the following beneficial effects:
according to the method, the factors possibly causing the blockage of the urea injection system are inspected, the corresponding inspection flow is provided, the reason for causing the blockage of the urea injection system is finally found out, the method is more accurate and reliable, a certain guiding significance is provided for rapidly solving the market problem after sales, and through the inspection steps, the inspection can be performed more rapidly, and the inspection efficiency is higher.
In order to more clearly illustrate the structural features and efficacy of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and examples.
Description of the drawings:
FIG. 1 is a flow chart of the urea injection system jam check provided by the invention.
FIG. 2 is a schematic diagram of a urea quality inspection flow in the present invention.
FIG. 3 is a schematic diagram of a urea nozzle cleaning process in accordance with the present invention.
The specific embodiment is as follows:
the invention will be further described in the following clear and complete description with reference to the figures and the associated knowledge, it being evident that the described applications are only some, but not all embodiments of the invention.
Example 1
Referring to fig. 1 to 3, in the method for checking the cause of the blockage of the urea injection system, aiming at the blockage fault of the urea injection system, the blockage fault of the urea pressure pipe or the urea injection unit of the SCR system is generally caused by the following reasons: the invention provides a corresponding investigation flow aiming at factors possibly causing the fault to quickly solve the problem. The method specifically comprises the following steps:
step one, preparing work
Checking the concentration of urea solution, wherein if the concentration of urea is too high or too low and oil impurities are contained, a urea injection system is blocked according to the quality of urea;
the urea solution concentration investigation flow is as follows:
1) Checking the liquid level of the urea box to ensure that the liquid level of the urea box is moderate;
2) A small amount of urea is taken from the urea tank using a suitable tool. The cleaning of tools is noted, so that pollution of diesel oil, engine oil and the like is avoided;
3) Reading the refractive index of the urea solution by a refractometer;
4) Detecting whether the urea solution contains oil or not by using oil test paper;
if the concentration of the urea solution is found to be too low/too high by the refractometer, it is indicated that the urea solution is diluted by water/oil or is not used for a long time, and the standard urea solution needs to be replaced; if the urea solution is detected by using the test paper, if the test paper changes color: indicating that the urea solution contains oil, and that the clean urea solution needs to be replaced and an SCR hydraulic system needs to be cleaned;
if the above is normal, step three is needed;
step three, urea pipe inspection
The flow is as follows: shorting the pump to nozzle line with transparent tube, detecting pressure change in pressure drop stage; if the error does not occur any more, checking whether the original vehicle pressure pipe is blocked, and if so, replacing the urea pipe; if the error is again present, step four is required.
Step four, urea nozzle crystallization inspection
If the urea injection system is blocked and the fault is cleared after the urea injection nozzle is cleaned, the investigation is finished.
According to the method, the factors possibly causing the blockage of the urea injection system are examined, the corresponding examination flow is provided, the reason for causing the blockage of the urea injection system is finally found out, the method is more accurate and reliable, and a certain guiding significance is provided for rapidly solving the market problem after sale.
Example 2
Referring to fig. 1-3, the invention provides a method for detecting blockage of a urea injection system, which comprises the following steps:
step one, preparing work; 1) A battery pack with sufficient electric power; 2) Ensuring the normal of the vehicle fuse; 3) The joint is normal, and no looseness or rust of pins exists; 4) Preparing refractometer, oil test paper, pressure gauge, diagnostic instrument and transparent tube tool;
step two, checking the concentration of urea solution
For urea quality, if the urea concentration is too high or too low and contains impurities such as oil, the urea injection system can be blocked; for urea solution concentration investigation, the flow is referred to as fig. 2, and the specific flow is as follows:
1) Checking the liquid level of the urea box to ensure that the liquid level of the urea box is moderate; in the investigation process, the urea level is ensured to be maintained at about 50%.
2) A small amount of urea is taken from the urea tank using a suitable tool. The cleaning of tools is noted, so that pollution of diesel oil, engine oil and the like is avoided;
3) Reading the refractive index of the urea solution by a refractometer; when the refractive index is read by using a refractometer, if the refractive index is 28-62%, the corresponding urea concentration is: 30.5% -34.5% if the urea solution concentration is found to be too low/too high: indicating that the urea solution is diluted with water/oil or left unused for a long period of time, the standard urea solution needs to be replaced.
4) Detecting whether the urea solution contains oil or not by using oil test paper
If the urea solution is detected by using the test paper, if the test paper changes color: indicating that the urea solution contains oil, and that the clean urea solution needs to be replaced and the SCR system is cleaned;
if the above is normal, step three is needed;
step three, urea pipe inspection
The flow is as follows: shorting the pump to nozzle line with transparent tube, detecting pressure change in pressure drop stage;
if the error does not occur any more, checking whether the original vehicle pressure pipe is blocked, and if so, replacing the urea pipe;
if the error is again present, step four is required.
Step four, urea nozzle crystallization inspection
The method comprises the following three modes, wherein a third method is preferably adopted:
method one, soaking method:
1) Soaking with hot water for at least 0.5 hours (care is taken to ensure that the water temperature is always higher than 80 degrees, and the water level is lower than the electrical connector to prevent the liquid from penetrating into the electromagnetic coil to cause short circuit), so as to ensure that the overall temperature of the nozzle is finally higher than 80 degrees;
2) Simultaneously, a small amount of water or urea is injected into a liquid inlet of the urea injection unit by a needle;
3) Connecting the soaked nozzle to a vehicle to perform a function test (or raising the exhaust temperature by more than 250 ℃), and continuously stepping on the accelerator in situ;
method two, ultrasonic cleaning method
1) Hot water is used as cleaning liquid (ensuring that the temperature of the cleaning liquid is always higher than 80 ℃, and the electrical connector of the nozzle is not soaked by water);
2) The cleaning time is more than 15 minutes (the cleaning can be directly carried out on a vehicle without removing the nozzle when the nozzle is cleaned), and the function test is carried out while the nozzle is cleaned (or the exhaust temperature is increased to more than 250 ℃, and the accelerator is continuously stepped on in situ);
method three, constant temperature bath pot cleaning method, its flow refers to figure 3
1) Cleaning by using a constant water bath kettle, and setting the water bath temperature to be 85 ℃;
2) Sealing the electrical interface by using a plug to prevent water vapor from corroding the electrical interface;
3) Adding purified water for cleaning;
4) Capping and waiting for 30 minutes;
5) Closing a water bath power supply, taking out the nozzle, and immediately loading the nozzle for jet test;
6) Draining the sewage in the water bath kettle, and cleaning the water bath kettle.
The invention has the advantages that: compared with the existing investigation method, the investigation method for the blockage cause of the urea injection system has the advantages that the considered factors are more comprehensive, the corresponding investigation method can be provided for the blockage cause of the urea injection system, the investigation process is more scientific by adopting a gradual emission method, the diversified comprehensive analysis is carried out on the blockage cause of the SCR system device under the condition of failed pressure establishment or no pressure establishment at all, and the result is more accurate and specific. By checking the factors (urea solution concentration, urea pipe and urea nozzle) which possibly cause the blockage of the urea injection system, a corresponding checking flow is provided, and finally the cause of the blockage of the urea injection system is found out.
The technical principle of the present invention has been described above in connection with specific embodiments, but is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. Other embodiments of the invention will occur to those skilled in the art without the exercise of inventive effort and are intended to fall within the scope of the invention.
Claims (1)
1. The method for checking the blockage reason of the urea injection system is characterized by comprising the following steps of: checking the concentration of urea solution; if the concentration of the urea solution is checked to be normal, checking a urea pipe; if not, performing a urea nozzle crystallization check, the urea solution concentration check comprising: checking the liquid level of the urea box, reading the refractive index of the urea solution by a refractometer, and detecting whether the urea solution contains oil or not by using oil test paper, wherein the liquid level of the urea box is maintained to be about 50% in the checking process; and in the process of reading the refractive index by using the refractometer, if the refractive index is 28-62%, the corresponding urea concentration: 30.5% -34.5% if the urea solution concentration is found to be too low/too high: indicating that the urea solution is diluted with water/oil or left unused for a long period of time, a standard urea solution needs to be replaced; by using the test paper to detect urea solution, if the test paper changes color: indicating that the urea solution contains oil, a clean urea solution needs to be replaced and the SCR system is cleaned, the urea pipe inspection comprises: shorting the pump to nozzle line with transparent tube, detecting pressure change in pressure drop stage; if the abnormality no longer occurs, checking whether the original vehicle pressure pipe is blocked, and if so, replacing the urea pipe; the urea nozzle crystallization check includes: cleaning by using a constant-temperature water bath kettle, and setting the water bath temperature to be 85 ℃; sealing the electrical interface by using a plug to prevent water vapor from corroding the electrical interface; adding purified water for cleaning; capping and waiting for 30 minutes; closing a water bath power supply, taking out the nozzle, and immediately loading the nozzle for jet test; draining the sewage in the water bath, and cleaning the water bath.
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| CN202210580877.7A CN114876619B (en) | 2022-05-25 | 2022-05-25 | Method for checking blockage reason of urea injection system |
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| JP5534602B2 (en) * | 2009-11-06 | 2014-07-02 | ボッシュ株式会社 | Abnormality detection device and abnormality detection method for reducing agent injection valve |
| CN105665344A (en) * | 2016-03-29 | 2016-06-15 | 中冶南方工程技术有限公司 | Cleaning method for acid gun jet system |
| CN211314332U (en) * | 2019-09-29 | 2020-08-21 | 潍柴动力股份有限公司 | Urea injection system detects and cleaning equipment |
| CN111677577A (en) * | 2020-04-22 | 2020-09-18 | 东风商用车有限公司 | Predictive maintenance system and method for SCR urea injection system |
| CN213493006U (en) * | 2020-05-22 | 2021-06-22 | 安阳化学工业集团有限责任公司 | Automotive urea solution oil filtering device |
| CN113588726A (en) * | 2021-08-31 | 2021-11-02 | 东风商用车有限公司 | Urea quality on-line monitoring method, device, equipment and readable storage medium |
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