CN111140318A - Method, device and equipment for diagnosing urea thawing capacity and storage medium - Google Patents
Method, device and equipment for diagnosing urea thawing capacity and storage medium Download PDFInfo
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- CN111140318A CN111140318A CN201911402045.0A CN201911402045A CN111140318A CN 111140318 A CN111140318 A CN 111140318A CN 201911402045 A CN201911402045 A CN 201911402045A CN 111140318 A CN111140318 A CN 111140318A
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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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- 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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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The embodiment of the invention provides a method, a device, equipment and a storage medium for diagnosing the unfreezing capability of urea, wherein the method comprises the steps of obtaining first heat for unfreezing the urea, which is generated by an engine in unit time, after the engine reaches a preset working condition; obtaining a second heat quantity required by complete thawing of urea in the urea box; obtaining defrosting time according to the first heat and the second heat; and when the time reaches the unfreezing time, diagnosing whether the urea is unfrozen, and prompting the fault according to the diagnosis result. When the theoretical heat that is used for urea thawing and the heat that urea in the urea case completely unfreezes theoretical need reach the equilibrium through considering the engine production in this embodiment, release diagnosis logic carries out the diagnosis of urea thawing capacity, can accurately reflect whether urea thawing capacity is normal, avoids normally working at the system that unfreezes, and urea is unfrozen just diagnoses and leads to reporting the mistake, misleading maintenance personal.
Description
Technical Field
The embodiment of the invention relates to the technical field of diagnosis of urea thawing capacity, in particular to a method, a device, equipment and a storage medium for diagnosing the urea thawing capacity.
Background
At present, some diesel vehicles use urea to treat tail gas, because the freezing point of the urea for vehicles is minus 11 ℃, the urea in a urea box is easy to freeze after the vehicles are stood for a long time in cold winter, and a urea pump cannot perform pressure building injection when the vehicles are restarted, so that the urea needs to be firstly unfrozen in a radical mode. The thawing of urea is mainly heated by the engine coolant. Monitoring whether urea thawing can be successful is necessary in the finished automobile requirements of the national six-stage diesel engine. The exhaust emission of diesel vehicles is directly influenced by the thawing capacity of urea.
In the prior art, generally, after an engine of a diesel vehicle is started and operated for a preset time, whether urea is unfrozen or not is detected, and if the urea is not unfrozen, a vehicle fault is reported to remind a driver or a maintenance worker.
In the urea thawing detection method based on time in the prior art, the condition that a thawing system is in a normal working state, but urea is not thawed before reaching detection time, and a vehicle fault is reported often occurs, so that the vehicle is frequently reported in error without faults, and maintenance personnel are misled.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for diagnosing the unfreezing capability of urea, which can accurately reflect whether the unfreezing capability of urea is normal or not and reduce the occurrence of false alarm and error.
In a first aspect, an embodiment of the present invention provides a method for diagnosing a urea thawing capacity, including:
acquiring first heat which is generated by the engine in unit time and used for unfreezing urea after the engine reaches a preset working condition;
obtaining a second heat quantity required by complete thawing of urea in the urea box;
obtaining defrosting time according to the first heat and the second heat;
and when the time reaches the unfreezing time, diagnosing whether the urea is unfrozen, and prompting the fault according to the diagnosis result.
In a possible design, the diagnosing whether the urea is thawed or not and performing fault indication according to the diagnosis result includes:
acquiring the temperature of a urea box and the state of a urea pump;
if the temperature of the urea box does not reach a preset temperature threshold value, determining that the urea is not unfrozen, and outputting a first-level fault prompt;
if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is not built, determining that the urea is not completely thawed, and outputting a secondary fault prompt;
and if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is built, determining that the urea is completely thawed, and not outputting a fault prompt.
In one possible design, the obtaining of the first heat generated by the engine in unit time for defrosting of urea after the engine reaches a predetermined operating condition includes:
acquiring the fuel injection quantity and the rotating speed of the engine after the engine reaches a preset working condition;
and determining a first heat quantity generated by the engine in unit time for defrosting the urea according to the fuel injection quantity of the engine and the rotating speed.
In one possible design, the obtaining the second heat required for completely defrosting urea in the urea tank includes:
obtaining the urea quality in a urea box, the actual temperature of the urea box and the minimum thawing requirement temperature of the urea;
and obtaining second heat required by the complete thawing of the urea in the urea box according to the urea quality in the urea box, the actual temperature of the urea box and the minimum thawing demand temperature of the urea.
In a possible design, before obtaining the thawing time according to the first heat and the second heat, the method further includes:
acquiring an ambient temperature and/or a vehicle speed;
and correcting the first heat quantity or the second heat quantity according to the environment temperature and/or the vehicle speed.
In a second aspect, an embodiment of the present invention provides a device for diagnosing a urea thawing capacity, including:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring first heat which is generated by an engine in unit time and used for unfreezing urea after the engine reaches a preset working condition; obtaining a second heat quantity required by complete thawing of urea in the urea box;
the processing module is used for acquiring unfreezing time according to the first heat and the second heat;
and the diagnosis module is used for diagnosing whether the urea is unfrozen or not when the time reaches the unfreezing time, and carrying out fault prompt according to a diagnosis result.
In one possible design, the diagnostic module, when diagnosing whether the urea is thawed or not and performing fault indication according to the diagnosis result, is configured to:
acquiring the temperature of a urea box and the state of a urea pump;
if the temperature of the urea box does not reach a preset temperature threshold value, determining that the urea is not unfrozen, and outputting a first-level fault prompt;
if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is not built, determining that the urea is not completely thawed, and outputting a secondary fault prompt;
and if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is built, determining that the urea is completely thawed, and not outputting a fault prompt.
In one possible design, the obtaining module, when obtaining the first heat for urea thawing generated by the engine in unit time after the engine reaches a predetermined operating condition, is configured to:
acquiring the fuel injection quantity and the rotating speed of the engine after the engine reaches a preset working condition;
determining a first heat quantity generated by the engine in unit time for unfreezing the urea according to the fuel injection quantity and the rotating speed of the engine; and/or
The obtaining module is used for obtaining a second heat quantity required by the urea to be completely thawed in the urea box:
obtaining the urea quality in a urea box, the actual temperature of the urea box and the minimum thawing requirement temperature of the urea;
and obtaining second heat required by the complete thawing of the urea in the urea box according to the urea quality in the urea box, the actual temperature of the urea box and the minimum thawing demand temperature of the urea.
In one possible design, before obtaining the thawing time according to the first heat and the second heat, the obtaining module is further configured to:
acquiring an ambient temperature and/or a vehicle speed;
and correcting the first heat quantity or the second heat quantity according to the environment temperature and/or the vehicle speed.
In a third aspect, an embodiment of the present invention provides a diagnostic apparatus for urea thawing capacity, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of diagnosing urea thaw capability as described above in the first aspect and in various possible designs of the first aspect.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement a method for diagnosing urea thawing capacity as described in the first aspect and various possible designs of the first aspect.
According to the method, the device and the equipment for diagnosing the urea thawing capacity and the storage medium, the first heat for thawing the urea generated by the engine in unit time is obtained after the engine reaches the preset working condition; obtaining a second heat quantity required by complete thawing of urea in the urea box; obtaining defrosting time according to the first heat and the second heat; and when the time reaches the unfreezing time, diagnosing whether the urea is unfrozen, and prompting the fault according to the diagnosis result. When the theoretical heat that is used for urea thawing and the heat that urea in the urea case completely unfreezes theoretical need reach the equilibrium through considering the engine production in this embodiment, release diagnosis logic carries out the diagnosis of urea thawing capacity, can accurately reflect whether urea thawing capacity is normal, avoids normally working at the system that unfreezes, and urea is unfrozen just diagnoses and leads to reporting the mistake, misleading maintenance personal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for diagnosing the thawing capacity of urea according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for diagnosing the thawing capacity of urea according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for diagnosing the thawing capacity of urea according to another embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for diagnosing the thawing capacity of urea according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a device for diagnosing the thawing capacity of urea provided by an embodiment of the present invention;
fig. 6 is a schematic hardware configuration diagram of a urea thawing capacity diagnosis device provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the urea thawing detection method based on time in the prior art, the detection of whether urea is thawed or not is started after the diesel vehicle engine is started and operates for a preset time, the detection time is fixed, if the thawing system is in a normal working state, but the urea is not thawed when the detection time is up, a vehicle fault can be reported, and the urea can be thawed when the thawing system actually works for a certain time, so that the urea thawing detection at what time influences whether the error condition can be mistakenly reported or not. Therefore, in the embodiment of the invention, the theoretical heat generated by the engine for unfreezing the urea and the heat between the theoretical heat generated by the engine and the heat required by the urea in the urea tank for completely unfreezing the urea are considered, when the theoretical heat is balanced, the urea in the urea tank is theoretically and completely unfrozen, whether the urea is really unfrozen and whether the urea pump is pressurized or not is detected, the unfreezing system is in a normal working state, whether the urea unfreezing capacity is normal or not can be accurately reflected, and therefore, the condition that the unfreezing system normally works and the urea is not unfrozen, and the fault is reported and the maintenance personnel are misled due to the diagnosis can be avoided.
The following examples are given for illustrative purposes.
Fig. 1 is a schematic flow chart of a method for diagnosing the thawing capacity of urea according to an embodiment of the present invention. As shown in fig. 1, the method for diagnosing the thawing capacity of urea includes:
s101, acquiring a first heat quantity which is generated by the engine in unit time and used for unfreezing the urea after the engine reaches a preset working condition.
In this embodiment, the heat generated during vehicle operation causes the temperature of the engine coolant to increase as the engine continues to operate. Under the pressure of the water pump, the cooling liquid is conducted to the urea box through the urea heating pipeline to heat and unfreeze the frozen urea. The coolant for urea thawing is merged into the large circulation of the engine coolant by a water pump, which makes the coolant for urea thawing circulate. After the cooling liquid rises to a certain temperature, due to the design of the cooling system of the whole vehicle, a relative heat balance state can be achieved, namely the temperature of the cooling liquid reaches a relatively stable state, and the urea heating pipe can be approximately equivalent to a constant-temperature heating body. Therefore, after the coolant reaches a certain limit value and the engine is stabilized within a preset working condition range (for example, the injection quantity and the rotating speed of the engine are stable), and the external boundary condition is relatively stable, the coolant for unfreezing the urea can stably transfer heat to the urea box to unfreeze the urea, and at the moment, the first heat for unfreezing the urea, which is generated by the engine in unit time, can be obtained.
More specifically, as shown in fig. 2, when acquiring the first heat generated by the engine per unit time for defrosting urea, the method may specifically include the following steps:
s1011, obtaining the fuel injection quantity and the rotating speed of the engine after the engine reaches a preset working condition;
and S1012, determining a first heat quantity which is generated by the engine in unit time and used for unfreezing the urea according to the fuel injection quantity and the rotating speed of the engine.
In the embodiment, because the heat generated by the engine in unit time is related to the fuel injection quantity and the rotating speed of the engine, the fuel injection quantity and the rotating speed of the engine after the engine reaches the preset working condition can be firstly obtained, and the first heat generated by the engine in unit time for defrosting urea is determined according to the fuel injection quantity and the rotating speed of the engine. Considering that not all of the heat generated by the engine per unit time is transferred to the engine coolant, that is, only a part of the heat generated by the engine per unit time is used for urea thawing, only the first heat generated by the engine per unit time for urea thawing is obtained in the present embodiment. Specifically, the heat for urea thawing generated by the engine in unit time at different engine oil injection quantities and different rotating speeds can be obtained through a pre-test or through thermodynamic simulation, a theoretical heat release MAP is generated, and then the first heat for urea thawing generated by the engine in unit time at present can be inquired from the theoretical heat release MAP according to the current engine oil injection quantity and rotating speed in practical application.
And S102, acquiring a second heat quantity required by complete thawing of urea in the urea box.
In this embodiment, the second heat required for completely thawing the urea in the urea tank can be derived by using thermodynamic theorem according to thermodynamic simulation. It is of course also possible to obtain a MAP of the theoretical required heat for complete defrosting of urea in the urea tank by means of experimental tests carried out beforehand or by means of thermodynamic simulation.
More specifically, as shown in fig. 3, when the second heat required for completely defrosting urea in the urea tank is obtained, the following steps may be specifically included:
s1021, obtaining the urea quality in the urea box, the actual temperature of the urea box and the minimum thawing required temperature of the urea;
s1022, obtaining a second heat quantity required by complete unfreezing of urea in the urea box according to the quality of the urea in the urea box, the actual temperature of the urea box and the minimum unfreezing requirement temperature of the urea.
In this embodiment, since the second heat quantity required for completely thawing the urea in the urea tank is related to the urea mass, the actual urea tank temperature and the minimum urea thawing requirement temperature in the urea tank, the second heat quantity required for completely thawing the urea in the urea tank can be determined according to the urea mass, the actual urea tank temperature and the minimum urea thawing requirement temperature in the urea tank. Because the freezing point of automobile-used urea is 11 ℃ below zero, in order to guarantee that urea unfreezes completely, and the urea pump can build pressure normally, can set for the minimum required temperature of unfreezing of urea and be higher than the freezing point of urea, optionally, the minimum required temperature of unfreezing of urea sets for 5 ℃ below zero. More specifically, the heat required by the complete urea thawing in the urea tank under different urea qualities, different actual urea tank temperatures and different minimum urea thawing demand temperatures can be obtained through a pre-test or through thermodynamic simulation, a theoretical demand heat MAP is generated, and then the second heat required by the complete urea thawing in the urea tank can be inquired from the theoretical demand heat MAP according to the current urea quality, the actual urea tank temperature and the minimum urea thawing demand temperature in actual application.
S103, obtaining the defrosting time according to the first heat and the second heat.
In this embodiment, when the first heat generated by the engine in unit time for unfreezing the urea and the second heat required for completely unfreezing the urea in the urea tank are obtained, the ratio of the second heat to the first heat can be obtained, and the time required for unfreezing can be obtained.
And S104, when the time reaches the unfreezing time, diagnosing whether the urea is unfrozen, and prompting faults according to the diagnosis result.
In this embodiment, timing may be started when the engine reaches a predetermined operating condition, when the time reaches the thawing time, the urea in the urea tank should be completely thawed theoretically, the diagnosis logic is released at this time, whether the urea is thawed or not is diagnosed according to the diagnosis logic, it may be reflected that the thawing system is in a normal operating state, it may be further accurately reflected whether the thawing capacity of the urea is normal or not, if the urea is completely thawed, the fault indication may not be output, and if the urea is not completely thawed, the fault indication may be output. Of course, the accumulated heat generated by the engine for urea thawing may also be monitored in this embodiment, and diagnostic logic may be released when the accumulated heat reaches the second heat.
More specifically, diagnosing whether urea is unfrozen or not, and performing fault prompting according to a diagnosis result, which specifically includes:
acquiring the temperature of a urea box and the state of a urea pump;
if the temperature of the urea box does not reach a preset temperature threshold value, determining that the urea is not unfrozen, and outputting a first-level fault prompt;
if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is not built, determining that the urea is not completely thawed, and outputting a secondary fault prompt;
and if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is built, determining that the urea is completely thawed, and not outputting a fault prompt.
In this embodiment, after the diagnostic logic is released, the urea tank temperature and the urea pump state may be obtained through the sensors, and then the diagnostic logic diagnoses whether the urea is thawed or not according to the urea tank temperature and the urea pump state, and determines whether to perform fault indication or not. The method comprises the steps that a temperature threshold can be preset, the preset temperature threshold is used as a reference, if the temperature of a urea box does not reach the preset temperature threshold, it is determined that urea is not unfrozen, and a primary fault prompt is output, which indicates that the urea unfreezing capacity of a vehicle is extremely low; if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is not built, the urea is not completely thawed, the pressure of the urea pump cannot be built, and the urea cannot be sprayed, so that a secondary fault prompt is output, and the low urea thawing capacity of the vehicle is indicated; and if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is built, determining that the urea is completely thawed, and not outputting a fault prompt. In this embodiment, the preset temperature threshold may be equal to the minimum thawing demand temperature of urea in the above embodiments, but may also be other temperature values, and may be set according to actual situations.
According to the method for diagnosing the unfreezing capability of the urea, the first heat which is generated by an engine in unit time and used for unfreezing the urea is obtained after the engine reaches the preset working condition; obtaining a second heat quantity required by complete thawing of urea in the urea box; obtaining defrosting time according to the first heat and the second heat; and when the time reaches the unfreezing time, diagnosing whether the urea is unfrozen, and prompting the fault according to the diagnosis result. When the theoretical heat that is used for urea thawing and the heat that urea in the urea case completely unfreezes theoretical need reach the equilibrium through considering the engine production in this embodiment, release diagnosis logic carries out the diagnosis of urea thawing capacity, can accurately reflect whether urea thawing capacity is normal, avoids normally working at the system that unfreezes, and urea is unfrozen just diagnoses and leads to reporting the mistake, misleading maintenance personal.
On the basis of any of the above embodiments, as shown in fig. 4, before obtaining the thawing time according to the first heat and the second heat in S103, the method may further include:
s201, acquiring an ambient temperature and/or a vehicle speed;
s202, correcting the first heat quantity or the second heat quantity according to the environment temperature and/or the vehicle speed.
In this embodiment, both the first heat generated in unit time for unfreezing the urea and the second heat required for completely unfreezing the urea in the urea tank can be theoretical heats calculated by a thermodynamic simulation method, so that influences of some other external factors such as ambient temperature and/or vehicle speed on the first heat or the second heat can be considered, in this embodiment, the ambient temperature and/or the vehicle speed can be obtained, the first heat or the second heat is corrected, in order to improve the calculation efficiency, only one of the first heat and the second heat can be corrected according to the ambient temperature and/or the vehicle speed, the accuracy of the unfreezing time can be improved, and the diagnosis logic release can be controlled in time.
Fig. 5 is a schematic structural diagram of a urea thawing capacity diagnosis device provided by an embodiment of the invention. As shown in fig. 5, the diagnostic apparatus 500 for urea thawing capability includes: an acquisition module 501, a processing module 502, and a diagnostic module 503.
The system comprises an obtaining module 501, a defrosting module and a defrosting module, wherein the obtaining module is used for obtaining first heat which is generated by an engine in unit time and used for defrosting urea after the engine reaches a preset working condition; obtaining a second heat quantity required by complete thawing of urea in the urea box;
a processing module 502, configured to obtain a thawing time according to the first heat and the second heat;
and the diagnosis module 503 is configured to diagnose whether urea is thawed or not when the time reaches the thawing time, and perform fault prompt according to a diagnosis result.
In one possible design, the diagnosis module 503 is configured to, when diagnosing whether the urea is thawed and performing fault indication according to the diagnosis result:
acquiring the temperature of a urea box and the state of a urea pump;
if the temperature of the urea box does not reach a preset temperature threshold value, determining that the urea is not unfrozen, and outputting a first-level fault prompt;
if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is not built, determining that the urea is not completely thawed, and outputting a secondary fault prompt;
and if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is built, determining that the urea is completely thawed, and not outputting a fault prompt.
In one possible design, the obtaining module 501 is configured to, when obtaining the first heat generated by the engine per unit time for defrosting urea after the engine reaches a predetermined operating condition:
acquiring the fuel injection quantity and the rotating speed of the engine after the engine reaches a preset working condition;
determining a first heat quantity generated by the engine in unit time for unfreezing the urea according to the fuel injection quantity and the rotating speed of the engine; and/or
The obtaining module 501, when obtaining the second heat quantity required for completely defrosting urea in the urea tank, is configured to:
obtaining the urea quality in a urea box, the actual temperature of the urea box and the minimum thawing requirement temperature of the urea;
and obtaining second heat required by the complete thawing of the urea in the urea box according to the urea quality in the urea box, the actual temperature of the urea box and the minimum thawing demand temperature of the urea.
In one possible design, the obtaining module 501 is further configured to, before obtaining the thawing time according to the first heat and the second heat:
acquiring an ambient temperature and/or a vehicle speed;
and correcting the first heat quantity or the second heat quantity according to the environment temperature and/or the vehicle speed.
The diagnostic apparatus for urea thawing capability provided in this embodiment may be used to implement the technical solution of the above diagnostic method for urea thawing capability, and its implementation principle and technical effect are similar, and this embodiment is not described herein again.
The diagnostic device for the unfreezing capability of the urea provided by the embodiment obtains the first heat which is generated by the engine in unit time and used for unfreezing the urea after the engine reaches the preset working condition; obtaining a second heat quantity required by complete thawing of urea in the urea box; obtaining defrosting time according to the first heat and the second heat; and when the time reaches the unfreezing time, diagnosing whether the urea is unfrozen, and prompting the fault according to the diagnosis result. When the theoretical heat that is used for urea thawing and the heat that urea in the urea case completely unfreezes theoretical need reach the equilibrium through considering the engine production in this embodiment, release diagnosis logic carries out the diagnosis of urea thawing capacity, can accurately reflect whether urea thawing capacity is normal, avoids normally working at the system that unfreezes, and urea is unfrozen just diagnoses and leads to reporting the mistake, misleading maintenance personal.
Fig. 6 is a schematic hardware configuration diagram of a urea thawing capacity diagnosis device provided by an embodiment of the invention. As shown in fig. 6, the diagnostic apparatus 600 for urea defrosting capability of the present embodiment includes: a processor 601 and a memory 602; wherein:
a memory 602 for storing computer-executable instructions;
a processor 601 for executing computer executable instructions stored by the memory to implement the steps in the above embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 602 may be separate or integrated with the processor 601.
When the memory 602 is provided separately, the diagnostic apparatus for urea thawing capability further includes a bus 603 for connecting the memory 602 and the processor 601.
Embodiments of the present invention also provide a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for diagnosing the urea thawing capacity as described above is implemented.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods described in the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for diagnosing the thawing capacity of urea, comprising:
acquiring first heat which is generated by the engine in unit time and used for unfreezing urea after the engine reaches a preset working condition;
obtaining a second heat quantity required by complete thawing of urea in the urea box;
obtaining defrosting time according to the first heat and the second heat;
and when the time reaches the unfreezing time, diagnosing whether the urea is unfrozen, and prompting the fault according to the diagnosis result.
2. The method of claim 1, wherein the diagnosing whether the urea is thawed or not and performing fault indication according to the diagnosis result comprises:
acquiring the temperature of a urea box and the state of a urea pump;
if the temperature of the urea box does not reach a preset temperature threshold value, determining that the urea is not unfrozen, and outputting a first-level fault prompt;
if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is not built, determining that the urea is not completely thawed, and outputting a secondary fault prompt;
and if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is built, determining that the urea is completely thawed, and not outputting a fault prompt.
3. The method of claim 1 or 2, wherein the obtaining of the first heat generated by the engine per unit time for urea thawing after the engine reaches a predetermined operating condition comprises:
acquiring the fuel injection quantity and the rotating speed of the engine after the engine reaches a preset working condition;
and determining a first heat quantity generated by the engine in unit time for defrosting the urea according to the fuel injection quantity of the engine and the rotating speed.
4. The method of claim 1 or 2, wherein said obtaining a second amount of heat required for complete defrosting of urea in the urea tank comprises:
obtaining the urea quality in a urea box, the actual temperature of the urea box and the minimum thawing requirement temperature of the urea;
and obtaining second heat required by the complete thawing of the urea in the urea box according to the urea quality in the urea box, the actual temperature of the urea box and the minimum thawing demand temperature of the urea.
5. The method of claim 1, wherein before obtaining the thawing time based on the first heat and the second heat, further comprising:
acquiring an ambient temperature and/or a vehicle speed;
and correcting the first heat quantity or the second heat quantity according to the environment temperature and/or the vehicle speed.
6. A diagnostic device for urea thawing capacity, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring first heat which is generated by an engine in unit time and used for unfreezing urea after the engine reaches a preset working condition; obtaining a second heat quantity required by complete thawing of urea in the urea box;
the processing module is used for acquiring unfreezing time according to the first heat and the second heat;
and the diagnosis module is used for diagnosing whether the urea is unfrozen or not when the time reaches the unfreezing time, and carrying out fault prompt according to a diagnosis result.
7. The apparatus of claim 6, wherein the diagnostic module, when diagnosing whether the urea is thawed and performing fault indication based on the diagnosis, is configured to:
acquiring the temperature of a urea box and the state of a urea pump;
if the temperature of the urea box does not reach a preset temperature threshold value, determining that the urea is not unfrozen, and outputting a first-level fault prompt;
if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is not built, determining that the urea is not completely thawed, and outputting a secondary fault prompt;
and if the temperature of the urea box reaches a preset temperature threshold value and the pressure of the urea pump is built, determining that the urea is completely thawed, and not outputting a fault prompt.
8. The apparatus of claim 6 or 7, wherein the capture module, when capturing the first heat generated by the engine per unit time for urea thawing after the engine reaches a predetermined operating condition, is configured to:
acquiring the fuel injection quantity and the rotating speed of the engine after the engine reaches a preset working condition;
determining a first heat quantity generated by the engine in unit time for unfreezing the urea according to the fuel injection quantity and the rotating speed of the engine; and/or
The obtaining module is used for obtaining a second heat quantity required by the urea to be completely thawed in the urea box:
obtaining the urea quality in a urea box, the actual temperature of the urea box and the minimum thawing requirement temperature of the urea;
and obtaining second heat required by the complete thawing of the urea in the urea box according to the urea quality in the urea box, the actual temperature of the urea box and the minimum thawing demand temperature of the urea.
9. A diagnostic device for urea thawing capacity, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of diagnosing urea thaw capability of any of claims 1-5.
10. A computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement a method for diagnosing urea thaw capability according to any one of claims 1-5.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112347618A (en) * | 2020-10-21 | 2021-02-09 | 潍柴动力股份有限公司 | Method and device for determining urea thawing efficiency and storage medium |
| CN112360597A (en) * | 2020-11-10 | 2021-02-12 | 潍柴动力股份有限公司 | Anti-crystallization control method and device based on sulfur dioxide sensor |
| CN113217152A (en) * | 2021-06-21 | 2021-08-06 | 河北亚大汽车塑料制品有限公司 | Urea pipe unfreezing injection experiment detection equipment |
| CN114352400A (en) * | 2022-01-18 | 2022-04-15 | 潍柴动力股份有限公司 | Engine fault detection device and fault detection method thereof |
| CN114922720A (en) * | 2022-05-23 | 2022-08-19 | 江铃汽车股份有限公司 | Low-temperature thawing control strategy correction method for injection system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147335A (en) * | 2010-12-31 | 2011-08-10 | 潍柴动力股份有限公司 | Method for testing unfreezing capacity of SCR (semiconductor control rectifier) system and system therefor |
| CN102808680A (en) * | 2012-07-27 | 2012-12-05 | 潍柴动力股份有限公司 | Control method for SCR system low-temperature thawing |
| US20130192699A1 (en) * | 2012-01-30 | 2013-08-01 | Denso Corporation | Urea-water pump device |
| JP2013221425A (en) * | 2012-04-13 | 2013-10-28 | Denso Corp | Injector control device of exhaust emission control device |
| CN103670629A (en) * | 2012-09-20 | 2014-03-26 | 北汽福田汽车股份有限公司 | Urea pipe heating control method of selective catalytic reduction (SCR) post-processing system of engine |
| KR20160091618A (en) * | 2015-01-26 | 2016-08-03 | 현대자동차주식회사 | Method for controlling temperature of urea-tank and control apparatus thereof |
| KR20190006364A (en) * | 2017-07-10 | 2019-01-18 | 현대자동차주식회사 | Urea Tank Module with Enhancing Heater and Urea Dosing System thereof |
| CN109611185A (en) * | 2018-12-18 | 2019-04-12 | 东风商用车有限公司 | The urea crystals Risk Forecast Method of Urea-SCR after-treatment system |
| CN109863284A (en) * | 2016-10-25 | 2019-06-07 | 五十铃自动车株式会社 | Urea water supply system and its control method |
| CN110284948A (en) * | 2019-06-29 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of control method of SCR system |
-
2019
- 2019-12-30 CN CN201911402045.0A patent/CN111140318B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147335A (en) * | 2010-12-31 | 2011-08-10 | 潍柴动力股份有限公司 | Method for testing unfreezing capacity of SCR (semiconductor control rectifier) system and system therefor |
| US20130192699A1 (en) * | 2012-01-30 | 2013-08-01 | Denso Corporation | Urea-water pump device |
| JP2013221425A (en) * | 2012-04-13 | 2013-10-28 | Denso Corp | Injector control device of exhaust emission control device |
| CN102808680A (en) * | 2012-07-27 | 2012-12-05 | 潍柴动力股份有限公司 | Control method for SCR system low-temperature thawing |
| CN103670629A (en) * | 2012-09-20 | 2014-03-26 | 北汽福田汽车股份有限公司 | Urea pipe heating control method of selective catalytic reduction (SCR) post-processing system of engine |
| KR20160091618A (en) * | 2015-01-26 | 2016-08-03 | 현대자동차주식회사 | Method for controlling temperature of urea-tank and control apparatus thereof |
| CN109863284A (en) * | 2016-10-25 | 2019-06-07 | 五十铃自动车株式会社 | Urea water supply system and its control method |
| KR20190006364A (en) * | 2017-07-10 | 2019-01-18 | 현대자동차주식회사 | Urea Tank Module with Enhancing Heater and Urea Dosing System thereof |
| CN109611185A (en) * | 2018-12-18 | 2019-04-12 | 东风商用车有限公司 | The urea crystals Risk Forecast Method of Urea-SCR after-treatment system |
| CN110284948A (en) * | 2019-06-29 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of control method of SCR system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112347618A (en) * | 2020-10-21 | 2021-02-09 | 潍柴动力股份有限公司 | Method and device for determining urea thawing efficiency and storage medium |
| CN112360597A (en) * | 2020-11-10 | 2021-02-12 | 潍柴动力股份有限公司 | Anti-crystallization control method and device based on sulfur dioxide sensor |
| CN113217152A (en) * | 2021-06-21 | 2021-08-06 | 河北亚大汽车塑料制品有限公司 | Urea pipe unfreezing injection experiment detection equipment |
| CN114352400A (en) * | 2022-01-18 | 2022-04-15 | 潍柴动力股份有限公司 | Engine fault detection device and fault detection method thereof |
| CN114352400B (en) * | 2022-01-18 | 2023-08-18 | 潍柴动力股份有限公司 | Engine fault detection device and fault detection method thereof |
| CN114922720A (en) * | 2022-05-23 | 2022-08-19 | 江铃汽车股份有限公司 | Low-temperature thawing control strategy correction method for injection system |
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