CN117418972A - Fault detection method and control device for EGR (exhaust gas Recirculation) cooler - Google Patents
Fault detection method and control device for EGR (exhaust gas Recirculation) cooler Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 63
- 230000000903 blocking effect Effects 0.000 claims abstract description 48
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- 238000004364 calculation method Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 16
- 230000000737 periodic effect Effects 0.000 claims description 9
- 238000005262 decarbonization Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000004042 decolorization Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 52
- 230000008021 deposition Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
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- 239000003054 catalyst Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
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- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
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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
Abstract
The application discloses a fault detection method and a control device of an EGR cooler, wherein the fault detection method can calculate the theoretical effective cooling volume and the actual effective volume of the EGR cooler based on detection parameters, calculate the blocking coefficient of the EGR cooler based on the theoretical effective cooling volume and the actual effective volume, and then determine whether the EGR cooler is blocked or not according to a comparison result of the blocking coefficient and a set threshold value. Therefore, the technical scheme can judge whether the EGR cooler is blocked or not in time based on the effective cooling volume of the EGR cooler.
Description
Technical Field
The present invention relates to the field of fault detection technology of engines, and more particularly, to a fault detection method and a control device for an EGR cooler.
Background
Exhaust gas recirculation (Exhaust Gas Recirculati)on, abbreviated as EGR) system is a functional system in an engine that is capable of recirculating a portion of the engine's exhaust gas back into the engine's cylinders for mixing with the engine's fresh intake air to improve engine operating efficiency, improve combustion environment, reduce NO X Emissions of compounds, reduced knock, and extended engine component life.
The EGR system mainly includes: an EGR cooler for gas cooling; an EGR valve for controlling EGR flow. The EGR cooler can avoid high-temperature exhaust gas from affecting the air intake efficiency and damaging the sensor at the air intake end. After long-term use of EGR, clogging problems occur, resulting in a decrease in cooling efficiency and EGR flow, and thus in NO in exhaust gas X And the content of harmful gases exceeds the standard, and the performance of the engine can be influenced. Therefore, how to find the blockage problem of the EGR cooler in time is a problem to be solved in the field of engine fault detection.
Disclosure of Invention
In view of this, the present application provides a fault detection method and a control device for an EGR cooler, where the scheme is as follows:
a fault detection method of an EGR cooler having an air inlet communicating with an exhaust line of an engine through an EGR valve and an air outlet communicating with an intake line of the engine, the fault detection method comprising:
acquiring detection parameters;
calculating a theoretical effective cooling volume and an actual effective volume of the EGR cooler based on the detection parameter;
calculating a blockage factor of the EGR cooler based on the theoretical effective cooling volume and the actual effective volume;
and determining whether the EGR cooler has a blockage fault or not based on a comparison result of the blockage factor and a set threshold.
Preferably, in the above fault detection method, determining whether the EGR cooler is blocked by a blocking fault based on a comparison result of a blocking coefficient and a set threshold includes:
judging whether the blocking coefficient is larger than a set threshold value or not;
if the blocking coefficient is larger than a set threshold value, performing carbon deposit removal treatment on the EGR cooler;
calculating a blocking coefficient of the EGR cooler after carbon deposit removal treatment;
judging whether the blocking coefficient of the EGR cooler after the carbon removal treatment is larger than the set threshold value or not;
and if the blockage factor after the carbon removal treatment is greater than the set threshold, outputting prompt information for prompting the blockage fault of the EGR cooler.
Preferably, in the above fault detection method, the performing the carbon removal process on the EGR cooler includes:
and regulating and controlling the opening degree of the EGR valve based on the periodical control signal, so that the flow of the exhaust gas which can pass through the EGR valve is periodically changed.
Preferably, in the fault detection method, the detection parameters include: EGR flow, exhaust temperature at the location where the EGR valve communicates with the exhaust conduit, and exhaust pressure;
the method of calculating the theoretical effective cooling volume includes:
calculating a theoretical temperature of an air outlet of the EGR cooler based on a relationship between the EGR flow rate and the exhaust gas temperature and an EGR cooled air temperature; calculating a theoretical pressure at an air outlet of the EGR cooler based on the relationship between the EGR flow rate and the exhaust pressure and the EGR cooled air pressure;
substituting the theoretical temperature and the theoretical pressure into a gas state equation, and calculating the theoretical effective cooling volume.
Preferably, in the fault detection method, the detection parameters include: the actual temperature and the actual pressure of the air outlet of the EGR cooler;
the method for calculating the actual effective volume comprises the following steps:
substituting the actual temperature and the actual pressure into a gas state equation, and calculating the actual effective volume.
The present application also provides a control device for executing the fault detection method described in any one of the above, the control device comprising:
the acquisition module is used for acquiring detection parameters;
a calculation module for calculating a theoretical effective cooling volume and an actual effective volume of the EGR cooler based on the detection parameter, and calculating a blocking coefficient of the EGR cooler based on the theoretical effective cooling volume and the actual effective volume;
and the processing module is used for determining whether the EGR cooler has a blockage fault or not based on the comparison result of the blockage coefficient and the set threshold value.
Preferably, in the above control device, the processing module is configured to determine whether the blocking coefficient is greater than a set threshold, if so, perform carbon deposition removal processing on the EGR cooler, determine whether the blocking coefficient after the carbon deposition removal processing on the EGR cooler is greater than the set threshold, and if so, output a prompt message for prompting that a blocking failure occurs in the EGR cooler;
wherein the calculation module is further configured to calculate a blocking coefficient of the EGR cooler after the decolourization process.
Preferably, in the above control device, the processing module is configured to regulate the opening of the EGR valve based on a periodic control signal, so that the flow rate of exhaust gas that can pass through the EGR valve changes periodically.
Preferably, in the above control device, the detection parameter includes: EGR flow, exhaust temperature at the location where the EGR valve communicates with the exhaust conduit, and exhaust pressure;
the computing module includes:
a first calculation unit configured to calculate a theoretical temperature of an air outlet of the EGR cooler based on the EGR flow rate and a relationship between the exhaust gas temperature and an air temperature after EGR cooling; and calculating theoretical pressure of an air outlet of the EGR cooler based on the relation between the EGR flow and the exhaust pressure and the air pressure after EGR cooling, substituting the theoretical temperature and the theoretical pressure into a gas state equation, and calculating the theoretical effective cooling volume.
Preferably, in the above control device, the detection parameter includes: the actual temperature and the actual pressure of the air outlet of the EGR cooler;
the computing module includes:
and the second calculation unit is used for substituting the actual temperature and the actual pressure into a gas state equation to calculate the actual effective volume.
As can be seen from the foregoing description, the technical solution of the present application provides a fault detection method and a control device for an EGR cooler, where the fault detection method can calculate a theoretical effective cooling volume and an actual effective volume of the EGR cooler based on detection parameters, calculate a blocking coefficient of the EGR cooler based on the theoretical effective cooling volume and the actual effective volume, and further determine whether the EGR cooler is blocked according to a comparison result between the blocking coefficient and a set threshold. Therefore, the technical scheme can judge whether the EGR cooler is blocked or not in time based on the effective cooling volume of the EGR cooler.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to the provided drawings without inventive effort to those skilled in the art.
The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and should not be construed as limiting the scope of the invention, since any structural modifications, proportional changes, or dimensional adjustments, which may be made by those skilled in the art, should not be construed as limiting the scope of the invention without affecting the efficacy or the achievement of the objective of the invention.
FIG. 1 is a schematic diagram of an engine result provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of an EGR cooler fault detection method according to an embodiment of the present application;
FIG. 3 is a flow chart of a method of determining whether an EGR cooler has a plugging failure provided in an embodiment of the present application;
FIG. 4 is a schematic flow chart of a method for calculating a theoretical effective cooling volume according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a computing module according to an embodiment of the present application;
fig. 7 is a schematic diagram of a control principle of an EGR valve according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will now be described more fully hereinafter with reference to the accompanying drawings, in which it is shown, and in which it is evident that the embodiments described are exemplary only some, and not all embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Accordingly, this application is intended to cover such modifications and variations of this application as fall within the scope of the appended claims (the claims) and their equivalents. The embodiments provided in the examples of the present application may be combined with each other without contradiction.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of an engine result provided in an embodiment of the present application, including:
a body 10, the body 10 having a plurality of cylinders 101;
an exhaust line 11 communicating with an exhaust port of the body 10;
an intake pipe 12 communicating with an intake port of the body 10;
an EGR system 13 is connected between the intake pipe 12 and the exhaust pipe 11, and the EGR system 13 is configured to return a part of exhaust gas in the exhaust pipe 11 to the intake pipe 12, where the part of exhaust gas is mixed with fresh intake air in the intake pipe 12 and then re-enters the engine body 10 for combustion. The arrows in fig. 1 indicate the gas flow direction.
The engine has a supercharger 14, the supercharger 14 including a turbine 141 in the exhaust line 11 and a compressor 142 in the intake line 12, the two being connected by a rotary shaft. The exhaust gas in the exhaust pipeline 11 can push the turbine to rotate, and then the compressor 142 is driven to do work through the rotating shaft, so that the air inlet pressure is increased.
An aftertreatment device 18 is provided downstream of the turbine 141 exhaust. The aftertreatment device 18 includes a DOC (Diesel Oxidation Catalyst, oxidation catalyst), a DPF (Diesel Particulate Filter, particulate trap), and an SCR (Selective Catalytic Reduction, selective catalytic reducer). The implementation of DOC, DPF and SCR in exhaust line 11 in aftertreatment device 18 is not limited to that shown in fig. 1, as DPF and SCR may be two separate modules or SCR catalyst may be coated directly on the DPF carrier to form an integrally integrated SDPF film. The implementation of aftertreatment device 18 is not limited in this embodiment.
An air filter 15 may also be provided in the inlet line 12 at a location upstream of the inlet of the supercharger 14 to filter out dust from the fresh inlet air.
An intake air flow sensor M0 may be provided in the intake pipe 12 for detecting a fresh intake air flow. The intake air flow sensor M0 may be disposed upstream of the intake air where the EGR system 13 is connected to the intake pipe 12 based on demand, and the intake air flow sensor M0 is not limited to the layout position in fig. 1.
An intercooler 16 may be provided on the intake line 12 to control the temperature of the fresh intake air. An intake throttle valve 17 may be provided in the intake line to control the fresh intake air flow.
A first temperature pressure sensor M1 may be provided in a pipe of the EGR system 13, the first temperature pressure sensor M1 being provided adjacent to an air outlet of the EGR cooler 131 for detecting the EGR-cooled gas temperature and gas pressure.
A second temperature and pressure sensor M2 may be provided on the intake pipe 12, and the second temperature and pressure sensor M2 is provided between the connection position of the EGR system 13 and the intake pipe 12 and the intake port of the engine body 10, for detecting the intake temperature and pressure of the mixed gas (the gas obtained by mixing fresh intake air with recirculated exhaust gas) that enters the engine body 10.
A third temperature and pressure sensor M3 may be provided on the exhaust line 11, the third temperature and pressure sensor M3 being located at a position upstream of the turbine 141 in exhaust gas for detecting the temperature and pressure of the exhaust gas.
The EGR system 13 includes an EGR valve 132 and an EGR cooler 131. In the manner shown in FIG. 1, the EGR system 13 is a high pressure EGR system, with EGR take-off located upstream of the exhaust of turbine 141. The high pressure EGR system can perform EGR gas extraction before vortex so that the EGR system has high driving pressure difference, but the EGR cooler is easy to be blocked due to the exhaust gas which flows through the EGR cooler and is not subjected to aftertreatment.
In the embodiment of the present application, a method for detecting a failure of an EGR cooler and a control device will be described by taking a high-pressure EGR system as an example. Obviously, the fault detection method and the control device may also be used for the low-pressure EGR system, which is not limited in the embodiment of the present application.
Referring to fig. 2, fig. 2 is a schematic flow chart of an EGR cooler fault detection method provided in an embodiment of the present application, as shown in fig. 1, an air inlet of an EGR cooler 131 is communicated with an exhaust pipeline 11 of an engine through an EGR valve 132, an air outlet of the EGR cooler 131 is communicated with the exhaust pipeline 11 of the engine, and the fault detection method shown in fig. 2 includes:
step S11: and obtaining detection parameters.
Step S12: based on the detected parameters, the theoretical effective cooling volume of the EGR cooler 131 as well as the actual effective volume are calculated.
Step S13: based on the theoretical effective cooling volume and the actual effective volume, the blocking coefficient of the EGR cooler 131 is calculated.
Step S14: based on the comparison of the blocking coefficient to the set threshold, it is determined whether a blocking fault exists in the EGR cooler 131 blocking.
With the failure detection method shown in fig. 1, the theoretical effective cooling volume and the actual effective volume of the EGR cooler 131 can be calculated based on the detection parameters, and the blocking coefficient of the EGR cooler 131 can be calculated based on the theoretical effective cooling volume and the actual effective volume, and further, whether the EGR cooler 131 is blocked can be determined based on the comparison result of the blocking coefficient and the set threshold. Therefore, the technical scheme can judge whether the blockage problem occurs to the EGR cooler 131 or not in time based on the effective cooling volume of the EGR cooler 131.
In step S14, a method for determining whether the EGR cooler 131 has a blockage failure based on the comparison result of the blockage factor and the set threshold is shown in fig. 2.
Referring to fig. 3, fig. 3 is a flowchart of a method for determining whether an EGR cooler has a blockage fault according to an embodiment of the present application, where the method includes:
step S21: and judging whether the blocking coefficient is larger than a set threshold value.
Step S22: if the blocking coefficient is greater than the set threshold, the EGR cooler 131 is de-carbonated.
In step S22, if the blocking coefficient is not greater than the set threshold value, execution of the failure detection method is restarted.
Step S23: the clogging factor after the decarbonizing process of the EGR cooler 131 is calculated.
Step S24: it is determined whether or not the clogging factor after the EGR cooler 131 decarbonizing process is greater than a set threshold.
Step S25: if the clogging factor after the decarbonization process is greater than the set threshold, a prompt message is output for prompting the occurrence of a clogging failure of the EGR cooler 131.
In step S25, if the clogging factor after the decarbonization process is not greater than the set threshold value, execution of the failure detection method is restarted.
In other embodiments, when it is determined in step S22 that the blocking coefficient is greater than the set threshold, the prompt message may be directly output. In this manner, after the user obtains the prompt information, the EGR cooler 131 may be further decarbonized in response to a user instruction.
In the fault detection method shown in fig. 2, when the blocking coefficient is larger than the set threshold, the carbon deposition treatment is conducted, so that the blocking problem caused by carbon deposition can be solved. The threshold may be set based on requirements, which is not limited in this application.
In the manner shown in fig. 2, the decarbonizing process of the EGR cooler includes: based on the periodic control signal, the opening degree of the EGR valve 132 is regulated so that the flow rate of exhaust gas through which the EGR valve 132 can pass periodically changes.
The periodic control signal may be a square wave signal or a sinusoidal signal, and may control the opening of the EGR valve 132 to alternately switch between a first opening and a second opening within a set period, where the first opening is a maximum opening that the periodic control signal enables the EGR valve 132, and the second opening is a minimum opening that the periodic control signal enables the EGR valve 132. The opening degree of the EGR valve 132 may be made to continuously jump between the first opening degree and the second opening degree if the square wave signal is used, and the opening degree of the EGR valve 132 may be made to continuously change between the first opening degree and the second opening degree if the square wave signal is used.
The exhaust gas flow rate through which the EGR valve 132 can pass periodically changes, so that the gas flow rate in the EGR system can be changed alternately, and gas oscillation can be formed, so as to eliminate carbon deposition in the EGR cooler 131, and solve the problem of blockage caused by carbon deposition.
In this embodiment, the detection parameters include: EGR flow rate, exhaust temperature at the position where the EGR valve 132 communicates with the exhaust pipe 11, and exhaust pressure. The exhaust gas temperature and the exhaust gas pressure may be collected by the third temperature and pressure sensor M3. And the engine cylinder volume is constant, i.e. the total intake air flow is constant, the fresh intake air flow can be detected by the intake air flow sensor M0, and the difference of the total intake air flow minus the fresh intake air flow is the EGR flow. In this case, the method of calculating the effective volume is shown in fig. 4.
Referring to fig. 4, fig. 4 is a schematic flow chart of a theoretical effective cooling volume calculation method according to an embodiment of the present application, where the method includes:
step S31: calculating a theoretical temperature of an air outlet of the EGR cooler 131 based on a relationship (hereinafter referred to as a first relationship) between the EGR flow rate and the exhaust gas temperature and the EGR cooled air temperature; based on the relationship between the EGR flow rate and the exhaust gas pressure and the EGR-cooled air pressure (hereinafter referred to as a second relationship), the theoretical pressure at the air outlet of the EGR cooler 131 is calculated.
Under the stable working condition of the engine, the EGR flow and the exhaust temperature have a first relation with the EGR cooled air temperature, and the EGR cooled air temperatures of the engine under a plurality of groups of EGR flow and exhaust temperature can be calibrated in advance to determine the first relation. Based on the pre-stored first relation, a theoretical temperature of the air outlet of the EGR cooler 131 is calculated.
Under the stable working condition of the engine, the EGR flow and the exhaust pressure have a second relation with the air pressure after the EGR cooling, and the air pressure after the EGR cooling of the plurality of groups of EGR flow and the exhaust pressure of the engine can be calibrated in advance to determine the second relation. Based on the second relation stored in advance, the theoretical pressure at the air outlet of the EGR cooler 131 is calculated.
Step S32: substituting the theoretical temperature and the theoretical pressure into a gas state equation, and calculating the theoretical effective cooling volume.
PV=nRT （1）
The above formula (1) is a gas state equation, P is a gas pressure, V is a gas volume, n is an amount of a gas substance, and R is a molar gas constant.
Setting the theoretical temperature as T 0 Theoretical pressure is P 0 The two satisfy the above formula (1), and after substituting (1), the theoretical volume V is determined 0 . In this embodiment, the detection parameters include: the actual temperature and the actual pressure at the outlet of the EGR cooler 131. The actual temperature and the actual pressure of the outlet port of the EGR cooler 131 can be acquired by the first temperature-pressure sensor M1. At this time, the method of calculating the actual effective volume includes: substituting the actual temperature and the actual pressure into a gas state equation to calculate the actual effective volume. Setting the actual temperature as T 1 The actual pressure is P 1 The two satisfy the above formula (1) and are substituted into%1) After that, the actual effective volume V is determined 1 . When the EGR cooler 131 is clogged, V is determined by the EGR flow rate, the exhaust gas temperature, and the exhaust gas pressure 1 Less than V 0 。
V 0 The larger the cooling efficiency is, the higher the effective cooling capacity is reduced, i.e. V, when clogging of the EGR cooler 131 occurs 1 Less than V 0 。
Wherein, the set blocking coefficient is fac, fac can be expressed as follows:
（2）
v1 and V0 are determined, and the corresponding fac can be determined by substituting the above formula (2).
As can be seen from the foregoing description, in the fault detection method for an EGR cooler provided in the embodiments of the present application, the correspondence between the temperature and the pressure after the EGR cooling can be calibrated based on the exhaust temperature, the exhaust pressure and the EGR flow, in the actual running process of the engine, the theoretical temperature and the theoretical pressure after the EGR cooling are calculated in real time based on the exhaust temperature, the exhaust pressure and the EGR flow obtained in real time, the theoretical effective cooling volume is calculated based on the gaseous equation, the blocking degree of the EGR cooler 131 is estimated based on the comparison result of the theoretical effective cooling volume and the actual effective volume, the blocking degree is related to the blocking coefficient, the blocking degree can be quantified by the blocking coefficient, and the blocking degree of the EGR cooler 131 can be monitored in real time. And when the blockage problem is determined, the regeneration of the EGR cooler 131 is realized based on the carbon removing treatment of the EGR cooler 131, and when the blockage problem cannot be solved by the carbon removing treatment, the alarm prompt is carried out.
On the basis of the fault detection method provided in the foregoing embodiment, another embodiment of the present application further provides a control device, configured to execute the fault detection method. The control device may be an onboard ECU.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present application, where the control device includes:
an acquisition module 21, wherein the acquisition module 21 is used for acquiring detection parameters;
a calculation module 22, wherein the calculation module 22 is configured to calculate a theoretical effective cooling volume and an actual effective volume of the EGR cooler 131 based on the detection parameter, and calculate a blocking coefficient of the EGR cooler 131 based on the theoretical effective cooling volume and the actual effective volume;
the processing module 23, the processing module 23 is configured to determine whether the EGR cooler 131 has a blockage fault based on a comparison of the blockage factor and a set threshold.
Optionally, the processing module 23 is configured to determine whether the blocking coefficient is greater than a set threshold, if yes, perform carbon deposition removal processing on the EGR cooler, determine whether the blocking coefficient after the carbon deposition removal processing of the EGR cooler 131 is greater than the set threshold, and if yes, output a prompt message for prompting that the EGR cooler has a blocking fault; wherein the calculation module 22 is further configured to calculate a blocking coefficient of the EGR cooler 131 after the de-carbonization process.
In this embodiment, the processing module 23 is configured to regulate the opening of the EGR valve 132 based on the periodic control signal, so that the flow of exhaust gas that can pass through the EGR valve 132 changes periodically. The principle of periodic variation in the flow of exhaust gas through which the processing module 23 controls the EGR valve 132 may be described in terms of an embodiment of a fault detection method.
As described above, the detection parameters include: EGR flow, exhaust temperature where the EGR valve communicates with the exhaust line, and exhaust pressure. At this time, the calculation module 22 may be as shown in fig. 6.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a computing module according to an embodiment of the present application, where the computing module 22 includes: a first calculation unit 221, the first calculation unit 221 being configured to calculate a theoretical temperature of an EGR cooler air outlet based on a relationship between an EGR flow rate and an exhaust gas temperature and an EGR cooled air temperature; based on the relationship between the EGR flow and the exhaust pressure and the air pressure after EGR cooling, calculating the theoretical pressure of the air outlet of the EGR cooler, substituting the theoretical temperature and the theoretical pressure into a gas state equation, and calculating the theoretical effective cooling volume.
As described above, the detection parameters include: the actual temperature and the actual pressure at the outlet of the EGR cooler 131. At this time, as shown in fig. 6, the calculation module 22 includes: and a second calculation unit 222, wherein the second calculation unit 222 is used for substituting the actual temperature and the actual pressure into a gas state equation to calculate the actual effective volume.
Referring to fig. 7, fig. 7 is a schematic diagram of a control principle of an EGR valve according to an embodiment of the present application, a control circuit 31 is connected to a control end of the EGR valve 132, the control circuit 31 has a first input end K1, a second input end K2, an enable end E and an output end, and the output end of the control circuit 31 is connected to the control end of the EGR valve 132. The first input terminal K1 inputs a normal EGR control signal to control the opening degree of the EGR valve 132, and the second input terminal K2 inputs a periodic control signal, which can periodically change the flow rate of exhaust gas passing through the EGR valve 132. The control device is connected to the enable terminal E and is used for controlling the conducting state of the control circuit 31.
When the EGR cooler 131 does not perform the decarbonization process, the first input terminal K1 communicates with the output terminal of the control circuit 31. When the EGR cooler 131 needs to be subjected to the carbon deposit removal process, the second output terminal K2 is controlled to communicate with the output terminal of the control circuit 31 through the enable terminal E to perform the carbon deposit removal process on the EGR cooler 131.
The control device provided by the embodiment of the application can execute the fault detection method, and can judge whether the EGR cooler 131 is blocked or not in time based on the effective volume of the EGR cooler 131.
In the present specification, each embodiment is described in a progressive manner, or a parallel manner, or a combination of progressive and parallel manners, and each embodiment is mainly described as a difference from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The control device disclosed in the embodiment corresponds to the fault detection method disclosed in the embodiment, so that the description is relatively simple, and the relevant parts refer to the description of the relevant parts of the fault detection method.
It is noted that in the description of the present application, it is to be understood that the drawings and descriptions of the embodiments are illustrative and not restrictive. Like reference numerals refer to like structures throughout the embodiments of the specification. In addition, the drawings may exaggerate the thicknesses of some layers, films, panels, regions, etc. for understanding and ease of description. It will also be understood that when an element such as a layer, film, region or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present. In addition, "on …" refers to positioning an element on or under another element, but not essentially on the upper side of the other element according to the direction of gravity.
The terms "upper," "lower," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the present application based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises such element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A fault detection method of an EGR cooler, wherein an intake port of the EGR cooler communicates with an exhaust line of an engine through an EGR valve, and an exhaust port of the EGR cooler communicates with an intake line of the engine, the fault detection method comprising:
acquiring detection parameters;
calculating a theoretical effective cooling volume and an actual effective volume of the EGR cooler based on the detection parameter;
calculating a blockage factor of the EGR cooler based on the theoretical effective cooling volume and the actual effective volume;
and determining whether the EGR cooler has a blockage fault or not based on a comparison result of the blockage factor and a set threshold.
2. The fault detection method according to claim 1, wherein determining whether the EGR cooler block has a block fault based on a comparison of a block coefficient to a set threshold value includes:
judging whether the blocking coefficient is larger than a set threshold value or not;
if the blocking coefficient is larger than a set threshold value, performing carbon deposit removal treatment on the EGR cooler;
calculating a blocking coefficient of the EGR cooler after carbon deposit removal treatment;
judging whether the blocking coefficient of the EGR cooler after the carbon removal treatment is larger than the set threshold value or not;
and if the blockage factor after the carbon removal treatment is greater than the set threshold, outputting prompt information for prompting the blockage fault of the EGR cooler.
3. The fault detection method according to claim 2, characterized in that the decolourizing process of the EGR cooler comprises:
and regulating and controlling the opening degree of the EGR valve based on the periodical control signal, so that the flow of the exhaust gas which can pass through the EGR valve is periodically changed.
4. The fault detection method according to claim 1, wherein the detection parameters include: EGR flow, exhaust temperature at the location where the EGR valve communicates with the exhaust conduit, and exhaust pressure;
the method of calculating the theoretical effective cooling volume includes:
calculating a theoretical temperature of an air outlet of the EGR cooler based on a relationship between the EGR flow rate and the exhaust gas temperature and an EGR cooled air temperature; calculating a theoretical pressure at an air outlet of the EGR cooler based on the relationship between the EGR flow rate and the exhaust pressure and the EGR cooled air pressure;
substituting the theoretical temperature and the theoretical pressure into a gas state equation, and calculating the theoretical effective cooling volume.
5. The fault detection method according to claim 1, wherein the detection parameters include: the actual temperature and the actual pressure of the air outlet of the EGR cooler;
the method for calculating the actual effective volume comprises the following steps:
substituting the actual temperature and the actual pressure into a gas state equation, and calculating the actual effective volume.
6. A control apparatus for performing the failure detection method according to any one of claims 1 to 5, characterized in that the control apparatus comprises:
the acquisition module is used for acquiring detection parameters;
a calculation module for calculating a theoretical effective cooling volume and an actual effective volume of the EGR cooler based on the detection parameter, and calculating a blocking coefficient of the EGR cooler based on the theoretical effective cooling volume and the actual effective volume;
and the processing module is used for determining whether the EGR cooler has a blockage fault or not based on the comparison result of the blockage coefficient and the set threshold value.
7. The control device according to claim 6, wherein the processing module is configured to determine whether the blocking coefficient is greater than a set threshold, and if so, perform a decarbonization process on the EGR cooler, determine whether the blocking coefficient after the decarbonization process is greater than the set threshold, and if so, output a prompt message for prompting that a blocking failure occurs in the EGR cooler;
wherein the calculation module is further configured to calculate a blocking coefficient of the EGR cooler after the decolourization process.
8. The control device according to claim 7, wherein the processing module is configured to regulate the opening of the EGR valve based on a periodic control signal such that the flow rate of exhaust gas through which the EGR valve can pass changes periodically.
9. The control device of claim 6, wherein the detected parameter comprises: EGR flow, exhaust temperature at the location where the EGR valve communicates with the exhaust conduit, and exhaust pressure;
the computing module includes:
a first calculation unit configured to calculate a theoretical temperature of an air outlet of the EGR cooler based on the EGR flow rate and a relationship between the exhaust gas temperature and an air temperature after EGR cooling; and calculating theoretical pressure of an air outlet of the EGR cooler based on the relation between the EGR flow and the exhaust pressure and the air pressure after EGR cooling, substituting the theoretical temperature and the theoretical pressure into a gas state equation, and calculating the theoretical effective cooling volume.
10. The control device of claim 6, wherein the detected parameter comprises: the actual temperature and the actual pressure of the air outlet of the EGR cooler;
the computing module includes:
and the second calculation unit is used for substituting the actual temperature and the actual pressure into a gas state equation to calculate the actual effective volume.
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