CN112983690A - Flow diagnosis method and device of EGR (exhaust gas Recirculation) system and automobile - Google Patents
Flow diagnosis method and device of EGR (exhaust gas Recirculation) system and automobile Download PDFInfo
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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
Abstract
The invention provides a flow diagnosis method and a device of an EGR system and an automobile, which do not take the pressure change in a pipeline of the EGR system as the basis to diagnose the flow, but take the temperature of an outlet of an EGR valve and the temperature of an air inlet pipeline in different states as the basis to diagnose the flow, are simple and easy to implement, adopt different diagnosis logics to diagnose the high flow and the low flow respectively, and respectively superpose the judgment of whether various parameters reach the standard or exceed the standard in the high flow diagnosis stage and the low flow diagnosis stage, the diagnosis result is more reliable and effective, and the corresponding high flow diagnosis or the low flow diagnosis can be carried out under various working conditions of an engine, thereby enabling the corresponding engine to meet the requirements of IUPR rate in CN6 regulations. The present invention also provides an EGR system and an engine management system having the flow diagnostic apparatus of the EGR system of the present invention, and a computer readable storage medium capable of implementing the flow diagnostic method of the EGR system.
Description
Technical Field
The invention relates to the technical field of exhaust gas recirculation, in particular to a flow diagnosis method and device of an EGR (exhaust gas recirculation) system, the EGR system, an engine management system, a computer readable storage medium and an automobile.
Background
An Engine (Engine) is a machine capable of converting other forms of energy into mechanical energy, and includes, for example, internal combustion engines (gasoline engines, etc.), external combustion engines (stirling engines, steam engines, etc.), electric motors, etc., wherein the internal combustion engines generally convert chemical energy into mechanical energy. The engine is suitable for a power generation device, and can also refer to the whole machine (such as a gasoline engine and an aircraft engine) comprising the power device. As the emission requirements of CN6 regulations increase, more and more automobile engine systems are being equipped with Exhaust Gas Recirculation (EGR) devices that can introduce a part of the Gas discharged after combustion of a small internal combustion engine for an automobile to the intake side for re-combustion, and mainly aim to reduce nitrogen oxides (NOx) and the like in the Exhaust Gas and improve fuel economy at partial load.
However, the CN6 regulation also puts new demands On the diagnosis of EGR, which requires On-Board Diagnostics (OBD system) to monitor the fault of low EGR flow and high EGR flow and meet the actual diagnosis rate (i.e. IUPR rate) requirement of 0.336, wherein the specific demands On the diagnosis of EGR in the CN6 regulation are as follows:
1) before the EGR flow exceeds or is lower than the flow specified by a production enterprise, so that the emission of the automobile exceeds a corresponding OBD threshold value, the OBD system detects a fault;
2) if the EGR system fails or ages to any extent, the OBD threshold will not be exceeded, but the OBD system will detect a failure when the EGR system reaches its control limit but still cannot increase flow to reach the target flow, or when the EGR system without feedback control is required to have EGR flow but not detect EGR flow.
However, the existing solution for diagnosing the flow rate by using the pressure change in the pipeline of the EGR system has a large matching workload and cannot make the fully automatic vehicle lacking the fuel cut-off condition meet the IUPR rate requirement of the CN6 regulation.
Therefore, a new flow diagnosis scheme for the EGR system is urgently needed, which is simple, easy to implement, high in reliability, and capable of meeting the requirements of CN6 regulations on flow diagnosis of the EGR system.
Disclosure of Invention
The invention aims to provide a flow diagnosis method and device of an EGR (exhaust gas recirculation) system, the EGR system, an engine management system, a computer readable storage medium and an automobile, which can reliably diagnose high and low flow faults of an EGR valve, have low false alarm risk, simple scheme and easy implementation and can meet the flow diagnosis requirement of the EGR system.
To achieve the above object, the present invention provides a flow rate diagnosis method of an EGR system, comprising:
a low flow diagnosis stage: monitoring whether the EGR system meets a preset initial sampling condition, respectively taking the EGR valve outlet temperature of the EGR system and the air inlet pipeline temperature of the EGR system which are collected at the moment as the initial outlet temperature and the initial air inlet pipeline temperature of low flow diagnosis once the EGR system meets the preset initial sampling condition, performing first flow integral on the target flow of the EGR valve when the target flow of the EGR valve is judged to exceed a calibrated flow, judging whether the variation of the current EGR valve outlet temperature is smaller than a preset variation threshold value or not after the first flow integral exceeds a first preset integral threshold value, judging whether the deviation between the current EGR valve outlet temperature and the current air inlet pipeline temperature is smaller than a preset deviation threshold value or not, and reporting a low flow fault if the deviation is smaller than the preset deviation threshold value; and the number of the first and second groups,
a high flow diagnosis stage: after the ERG valve is opened, performing second flow integral on the target flow of the EGR valve, taking the temperature of the outlet of the EGR valve collected when the EGR valve is switched from open to closed as the initial temperature of high flow diagnosis after the second flow integral exceeds a second preset integral threshold, judging whether the temperature of the outlet of the EGR valve after the EGR valve is closed is lower than a preset descending threshold or not when the state of the EGR system after the initial temperature is collected can meet preset state conditions and can be maintained above a calibration time length, and if so, reporting a high flow fault.
Optionally, in the low flow diagnosis phase, the preset initial sampling condition includes: the temperature of the engine water of the EGR system exceeds a preset temperature threshold value, the closing time of the EGR valve of the EGR system exceeds a calibration time, and the deviation between the outlet temperature of the EGR valve and the temperature of the air inlet pipeline is smaller than a calibration temperature difference value.
Optionally, in the low flow diagnosis stage, the variation of the intake pipe temperature at that moment to the initial intake pipe temperature is calculated at the initial time of performing the first flow integration, and is recorded as the initial intake pipe temperature difference; after the first flow integral exceeds a first preset integral threshold, the amount of change in the current EGR valve outlet temperature is equal to the current EGR valve outlet temperature while subtracting the initial outlet temperature and the initial intake conduit temperature differential.
Optionally, in the low flow diagnostic phase, after the initial outlet temperature and initial intake conduit temperature, when it is determined that the target flow of the EGR valve does not exceed the calibrated flow, clearing the corresponding first flow integral.
Optionally, in the low flow diagnosis stage, after performing a first flow integral on the target flow of the EGR valve, when it is determined that the first flow integral does not exceed a first preset integral threshold, or when it is determined that the amount of change in the current outlet temperature of the EGR valve is not less than a preset change threshold, or when the deviation between the current outlet temperature of the EGR valve and the current inlet pipe temperature is not less than a preset deviation threshold, the step of determining whether the target flow of the EGR valve exceeds a calibration flow is returned.
Optionally, in the high flow diagnostic phase, the preset state conditions include: the acceleration of the engine is less than a preset threshold acceleration, the EGR valve is closed, and the engine water temperature is greater than the preset temperature threshold.
Optionally, in the high flow diagnosis stage, when the state of the EGR system after the initial temperature fails to meet a preset state condition, or the state of the EGR system after the initial temperature can meet a preset state condition but cannot be maintained above a calibrated duration, the initial temperature of the high flow diagnosis is collected again.
Based on the same inventive concept, the present invention also provides a flow diagnostic apparatus of an EGR system, comprising:
a monitoring module configured to monitor an engine water temperature of the EGR system, the EGR train, respectively
Opening and closing an EGR valve of the system, the temperature of an outlet of the EGR valve, and the temperature of an air inlet pipeline of the EGR system;
a low flow diagnostic module configured to determine whether the EGR system satisfies a preset initial sampling condition according to a monitoring result of the monitoring module, and upon determination of satisfaction, the EGR valve outlet temperature of the EGR system and the air inlet pipeline temperature of the EGR system collected by the monitoring module at the moment are respectively used as the initial outlet temperature and the initial air inlet pipeline temperature of the low flow diagnosis, and when the target flow of the EGR valve is judged to exceed the calibration flow, performing a first flow integral on a target flow of the EGR valve, and judging whether the current variation of the EGR valve outlet temperature is smaller than a preset variation threshold value after the first flow integral exceeds a first preset integral threshold value, judging whether the deviation between the current EGR valve outlet temperature and the current air inlet pipeline temperature is smaller than a preset deviation threshold value or not, and if so, reporting a low-flow fault; and the number of the first and second groups,
the high flow diagnosis module is configured to perform second flow integral on the target flow of the EGR valve after the ERG valve is opened, and after the second flow integral exceeds a second preset integral threshold, take the outlet temperature of the EGR valve, which is collected when the EGR valve is turned from open to close, as the initial temperature of high flow diagnosis, and when the state of the EGR system after the initial temperature is collected can meet preset state conditions and can be maintained above a calibration duration, judge whether the decrease of the outlet temperature of the EGR valve after the EGR valve is closed relative to the initial temperature is smaller than a preset decrease threshold, and if so, report a high flow fault.
Optionally, the monitoring module includes an outlet temperature sensor disposed on an outlet side of the EGR valve, and an intake line temperature sensor disposed on an intake line of the EGR system.
Optionally, in the low flow diagnostic module, the preset initial sampling condition includes: the temperature of the engine water of the EGR system exceeds a preset temperature threshold value, the closing time of the EGR valve of the EGR system exceeds a calibration time, and the deviation between the outlet temperature of the EGR valve and the temperature of the air inlet pipeline is smaller than a calibration temperature difference value.
Optionally, in the low flow diagnostic module, the variation of the intake pipe temperature at that moment with respect to the initial intake pipe temperature is calculated at the initial time of performing the first flow integration, and is recorded as the initial intake pipe temperature difference; after the first flow integral exceeds a first preset integral threshold, the amount of change in the current EGR valve outlet temperature is equal to the current EGR valve outlet temperature while subtracting the initial outlet temperature and the initial intake conduit temperature differential.
Optionally, in the high flow diagnostic module, the preset status condition includes: the acceleration of the engine is smaller than a preset threshold acceleration; the EGR valve is closed; and the engine water temperature is higher than the preset temperature threshold.
Optionally, the low flow diagnostic module and the high flow diagnostic module are each integrated into a corresponding engine management system of the engine.
Based on the same inventive concept, the present invention also provides an EGR system, comprising:
an engine;
an intake line connected to an intake port of the engine;
an exhaust line connected to an exhaust port of the engine;
the EGR pipeline is provided with an EGR valve and is arranged between the exhaust pipeline and the air inlet pipeline; and the number of the first and second groups,
the invention relates to a flow diagnostic device for an EGR system.
Based on the same inventive concept, the invention also provides an engine management system, comprising:
a sensor assembly configured to monitor at least one parameter of an engine in the EGR system including a speed, an acceleration, a water temperature, and an intake air amount;
the flow rate diagnosis device of the EGR system according to the present invention, and,
and a controller configured to control operations of the engine, an EGR valve of the EGR system, and the flow rate diagnosing device, and to control a fuel supply amount, based on a monitoring result of the sensor assembly and a monitoring result of a monitoring module in the flow rate diagnosing device.
Based on the same inventive concept, the invention also provides an automobile comprising the EGR system and/or the engine management system.
Based on the same inventive concept, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the diagnosis method of the EGR system according to the present invention.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the flow diagnosis method and apparatus of the EGR system, the engine management system, the computer-readable storage medium, and the automobile of the present invention do not perform the flow diagnosis based on the pressure change in the pipe of the EGR system any more, but the flow diagnosis is carried out by taking the outlet temperature of the EGR valve and the temperature of the air inlet pipeline under different states as the basis, the method is simple and easy to implement, and simultaneously, different diagnosis logics are adopted to carry out high flow diagnosis and low flow diagnosis respectively, and the judgment whether the various parameters reach the standard or exceed the standard is respectively superposed in the high flow diagnosis stage and the low flow diagnosis stage, therefore, the diagnosis result is more reliable and effective, the corresponding high flow diagnosis or low flow diagnosis can be carried out under various working conditions of the engine, so that the corresponding engine (including the engine lacking the fuel cut-off condition) can also meet the requirements of the IUPR rate in the CN6 regulation.
Drawings
FIG. 1 is a schematic diagram of an EGR system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a low flow diagnostic phase of an EGR system in accordance with an embodiment of the present invention;
FIG. 3 is a graphical illustration of corresponding parameters for a low flow diagnostic phase of an EGR system in accordance with an embodiment of the present invention;
FIG. 4 is a graphical illustration of the respective flag and status signals over time during a low flow diagnostic phase of an EGR system in accordance with an embodiment of the present invention;
FIG. 5 is a schematic flow diagram of a high flow diagnostic phase of an EGR system in accordance with an exemplary embodiment of the present invention;
FIG. 6 is a graphical illustration of corresponding parameters for a high flow diagnostic phase of an EGR system in accordance with an embodiment of the present invention;
FIG. 7 is a graphical illustration of the respective flag and status signals over time during a low flow diagnostic phase of an EGR system in accordance with an embodiment of the present invention;
FIG. 8 is a graphical illustration of experimental test results for a low flow diagnostic phase of an EGR system in accordance with an embodiment of the present invention;
FIG. 9 is a graphical illustration of experimental test results for a high flow diagnostic phase of an EGR system in accordance with an embodiment of the present invention;
fig. 10 is a functional block composition diagram of a flow rate diagnosis device of an EGR system according to an embodiment of the present invention.
Detailed Description
The technical solution proposed by the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
An embodiment of the present invention provides a flow diagnosis method for an EGR system, which can be applied to diagnosis of a low flow fault and a high flow fault of an EGR valve 104 of the EGR system shown in fig. 1. Referring to fig. 1, the structure of the EGR system specifically includes: air cleaner 101, supercharger 102, throttle 103, EGR valve 104, EGR intercooler 105, engine 106, turbine 107, catalyst 108, and particulate filter 109. The air conditioner comprises an air filter 101, a supercharger 102 and a throttle valve 103, wherein the air filter 101, the supercharger 102 and the throttle valve 103 form an air inlet pipeline connected with an air inlet of an engine, specifically, an air outlet of the air filter 101 is communicated with an air inlet of the engine 106 through an air cavity of the supercharger 102 and the throttle valve 103 to provide an air source for the engine 106, and an air inlet pipeline temperature sensor 110 is arranged on a pipeline between the throttle valve 103 and the air inlet of the engine 106 to collect the temperature of the air inlet pipeline; the turbine 107, the catalyst 108 and the particulate filter 109 form an exhaust pipeline connected with an exhaust port of the engine, specifically, the exhaust port of the engine 106 is communicated with an air inlet of the particulate filter 109 through an exhaust gas cavity of the turbine 107 and the catalyst 108 so as to discharge exhaust gas combusted by the engine 106; the EGR valve 104 and the EGR intercooler 105 constitute an EGR line disposed between the exhaust line and the intake line, the EGR intercooler 105 is connected to an exhaust port of the engine 107 to extract a part of exhaust gas in front of the turbine 107 and send the extracted exhaust gas to the front of an intake port of the engine 106 through the EGR valve 104 (i.e., an exhaust gas recirculation flow control valve) to be uniformly mixed with gas output from the throttle valve 104, and then the mixture is introduced into the engine 4 for combustion, the EGR valve 104 is used for adjusting the flow rate of EGR gas in the EGR line, and the EGR valve outlet temperature sensor 111 is disposed on a line between an outlet of the EGR valve 104 and the intake port of the engine 106 and used for collecting the outlet temperature of the EGR valve 104. The throttle valve 103 (may be referred to as a throttle valve) whose opening degree can be driven by a stepping motor and monitored by a throttle valve sensor for detecting the opening degree of the throttle valve, and the stepping motor can be driven in accordance with the operation of an accelerator pedal by a driver to thereby adjust the opening degree of the throttle valve 103.
The flow diagnosis method of the EGR system of the present embodiment includes a low flow diagnosis stage for implementing low flow fault diagnosis and a high flow diagnosis stage for implementing high flow fault diagnosis. The low flow rate diagnosis stage and the high flow rate diagnosis stage are not limited in execution sequence, and the low flow rate diagnosis stage may be executed first, and then the high flow rate diagnosis stage is executed, or the high flow rate diagnosis stage may be executed first, and then the low flow rate diagnosis stage is executed, or the low flow rate diagnosis stage and the high flow rate diagnosis stage may be executed at the same time.
Referring to fig. 1 to 4, in the flow rate diagnosis method of the EGR system of the present embodiment, the specific steps of the low flow rate diagnosis stage include:
and S11, judging whether the current state of the EGR system meets the preset initial sampling condition for triggering the low flow diagnosis, if so, executing the step S12, otherwise, repeatedly executing the step S11. In this embodiment, the preset initial sampling condition includes three items: (1) the water temperature of the engine 106 of the EGR system exceeds a preset temperature threshold; (2) the closing duration of the EGR valve 104 of the EGR system exceeds a calibrated duration; (3) the difference (i.e., deviation) dtagrtans between the current EGR valve outlet temperature tagrvsrr and the intake line temperature tansk of the EGR system is less than the nominal temperature difference. If the current state of the EGR system simultaneously meets the three initial sampling conditions, the current state of the EGR system is judged to meet the initial sampling condition of low flow diagnosis, and low flow diagnosis work, namely low flow diagnosis enabling, can be triggered.
S12, when the preset initial sampling condition is satisfied, triggering low flow diagnosis operation, and using the EGR valve outlet temperature tagrvsrr and the intake pipe temperature tansk collected at this time as the initial outlet temperature tagrvsrr _ low _ ini and the initial intake pipe temperature tansk _ low _ ini (i.e. initial temperature sampling value) of low flow diagnosis, respectively, thereby completing initial temperature sampling, and jumping to the next step S13. The EGR valve outlet temperature tagrvsrr is collected by an outlet temperature sensor 111 disposed near the outlet of the EGR valve, and the intake pipe temperature tansk of the EGR system is collected by an intake pipe temperature sensor 110 disposed on the intake pipe near and in communication with the outlet of the EGR valve. Whether the initial temperature sample values tagrvsrr _ low _ ini and tansk _ low _ ini are completely acquired or not can be determined by monitoring the state of the initial temperature sample completion flag B _ endigrlow 1 in fig. 4, and when the B _ endigrlow 1 is set to "1" (i.e. the level thereof is high), it indicates that the initial temperature sample values tagrvsrr _ low _ ini and tansk _ low _ ini are completely acquired.
S13, after collecting the initial temperature sampling values tagrvsrr _ low _ ini and tansk _ low _ ini, determining whether the target flow of the EGR valve 104 exceeds the calibrated flow, if yes, performing step S14, and if no, performing step S15.
S14, a first flow integral msagrs _ sum _ g1 is performed on the target flow of the EGR valve 104. Optionally, at the initial time when the first flow integral msagrs _ sum _ g1 is performed, the amount of change in the intake pipe temperature tansk at that time from the initial intake pipe temperature tansk _ low _ ini is calculated and recorded as the initial intake pipe temperature difference delta _ tansk.
S15, the previous first flow integral msagrs _ sum _ g1 is cleared.
S16, determining whether the first flow integral msagrs _ sum _ g1 exceeds a first preset integration threshold, which may be implemented by monitoring the signal B _ endagrlow in fig. 4, when the low flow diagnosis is enabled and the first flow integral msagrs _ sum _ g1 exceeds the first preset integration threshold, the signal B _ endagrlow may generate a pulse, that is, when the pulse of the signal B _ endagrlow is monitored, it may be determined that the first flow integral msagrs _ sum _ g1 exceeds the first preset integration threshold, at this time, step S17 is executed, and if not, step S13 is returned.
S17, judging whether the variation delta _ tagrvsrr _ low of the current EGR valve outlet temperature tagrvsrr is smaller than a preset variation threshold value, judging whether the deviation dtagrtanes between the current EGR valve outlet temperature tagrvrr and the air inlet pipeline temperature tansk is smaller than a preset deviation threshold value, and if the two judgment results are yes (namely, both are smaller), executing a step S18 of reporting a low flow fault; if one judgment result is yes and the other judgment result is no, returning to the step S13; if both the two determination results are "no", then step S19 is executed: the EGR low flow diagnostic is complete and a diagnostic result of "no low flow fault" is reported. Wherein delta _ tagrvsrr _ low is tagrvsrr-tagrvsrr _ low _ ini-delta _ tansk, i.e. after said first flow integral msagrs _ sum _ g1 exceeds a first preset integral threshold value, the current EGR valve outlet temperature change delta _ tagrvsrr _ low is equal to the current EGR valve outlet temperature tagrvrr while subtracting said initial outlet temperature tagrvsrr _ low _ ini and said initial inlet line temperature difference delta _ tansk,
referring to fig. 1 and fig. 5 to 7, in the flow rate diagnosis method of the EGR system of the present embodiment, the specific steps of the high flow rate diagnosis stage include:
s21, judging whether the ERG valve is opened or not, if so, carrying out second flow integral msagrs _ sum _ g2 on the target flow of the EGR valve, and if not, clearing the second flow integral msagrs _ sum _ g 2.
S22, judging whether the second flow integral msagrs _ sum _ g2 exceeds a second preset integral threshold value, if so, executing a step S23; if not, the process returns to step S21.
S23, judging whether the EGR valve is switched from open to closed, if so, executing a step S24; if not, the process returns to step S21.
S24, the EGR valve outlet temperature tagrvsrr collected when the EGR valve is switched from open to closed is used as the initial temperature tagrvsrr _ high _ ini of the high flow diagnosis.
S25, after the initial temperature tagrvsrr _ high _ ini is collected, determining whether the state of the EGR system (i.e. the state of the EGR system after the initial temperature is collected) can satisfy a preset state condition and can be maintained above a calibrated duration, if yes, executing step S26; if not, the method returns to step S21 to re-acquire the initial temperature tagrvsrr _ high _ ini of the high flow diagnosis. Wherein the preset state conditions include: a) the acceleration of the engine is smaller than a preset threshold acceleration; b) the EGR valve is closed; and, c) the engine water temperature is above the preset temperature threshold.
S26, determining whether a drop delta _ tagrvsrr _ high of the EGR valve outlet temperature tagrvsrr after the EGR valve is closed relative to the initial temperature tagrvsrr _ high _ ini is smaller than a preset drop threshold, if yes, executing step S27: reporting a high flow fault; if not, step S28 is executed, wherein the EGR high flow rate diagnosis is completed and a diagnosis result of 'no high flow rate fault' is reported. Wherein, delta _ tagrvsrr _ high ═ tagrvsrr _ high _ ini-tagrvsrr.
The flow diagnosis method of the EGR system can meet the flow diagnosis requirement of the high-pressure EGR system. In order to specifically explain the reliability of the flow diagnosis method of the EGR system, the inventor also carries out a plurality of times of fault-free and fault simulation tests, calculates the false alarm and false alarm probabilities when the flow diagnosis method of the EGR system is applied to the flow diagnosis of the high-pressure EGR system through a statistical method, and the statistical analysis result of the test shows that the flow diagnosis method of the EGR system can reliably diagnose the high-flow and low-flow faults of the EGR system without the risk of false alarm. When the high-pressure EGR system is installed on an automobile, the flow diagnosis method of the EGR system can finish the diagnosis of high and low flows of the EGR system on the automobile within 15-20 minutes of normally driving the automobile. The statistical analysis results for a particular test are as follows:
(1) statistical analysis of test results for low flow diagnostics
By applying the flow diagnosis method of the EGR system, 45 groups of low-flow fault-free tests (simulation and actual measurement) and 15 groups of fault simulation tests (simulation and actual measurement) are carried out, and the test results are shown in FIG. 8.
After statistical analysis is performed on the low-flow non-fault test result in the test result shown in fig. 8, the low-flow fault false alarm probability calculation result shown in table 1 can be obtained, and the fault threshold set in table 1 for dtagrtans and the fault threshold set in delta _ tagrvsrr _ low are both 10 degrees.
TABLE 1 Low flow, No Fault, false alarm probability calculation results
The final false alarm probability in table 1 is approximately equal to 0.00%, which shows that the flow diagnosis method of the EGR system of the present invention can reliably diagnose the low flow fault of the EGR system and basically has no false alarm risk.
After statistical analysis is performed on the low-flow fault simulation test result in the test results shown in fig. 8, the low-flow fault false-positive probability calculation result shown in table 2 can be obtained.
TABLE 2 probability calculation of low flow failure false negative probability
The final false alarm missing probability in table 2 is 0.00317% ≈ 0.00%, which shows that the flow rate diagnosis method of the EGR system of the present invention can reliably diagnose the low flow rate fault of the EGR system and basically miss the risk of false alarm.
(2) Statistical analysis of test results for high flow diagnostics
By applying the flow diagnosis method of the EGR system, 18 groups of high-flow fault-free tests (simulation and actual measurement) and 14 groups of fault simulation tests (simulation and actual measurement) are carried out, and the test results are shown in FIG. 9.
After statistical analysis is performed on the high-flow non-fault test result in the test results shown in fig. 9, a high-flow fault false alarm probability calculation result shown in table 3 can be obtained, and the fault threshold of delta _ tagrvsrr _ high is set to be 1 degree in table 3.
TABLE 3 high flow Fault false alarm probability calculation results
| Fault-free delta _ tagrvsrr _ high mean value mu | 11.46354167 |
| Standard deviation sigma | 1.229700755 |
| n (distance between the upper and lower limits and the central value) | 8.5 |
| μ-n*σ | 1.011085247 |
| False alarm probability (probability less than mu-n sigma) | 0.00％ |
The final false alarm probability in table 3 is approximately equal to 0.00%, which shows that the flow diagnosis method of the EGR system of the present invention can reliably diagnose the high flow fault of the EGR system and basically has no false alarm risk.
After statistical analysis is performed on the high-flow fault simulation test result in the test results shown in fig. 9, the high-flow fault failure probability calculation result shown in table 4 can be obtained.
TABLE 4 probability calculation of high flow failure false negatives
| High flow failure delta _ tagrvsrr _ high mean μ | -3.4921875 |
| Standard deviation sigma | 1.706102395 |
| n (distance between the upper and lower limits and the central value) | 2.65 |
| μ+n*σ | 1.028983846 |
| Probability of missing report (probability greater than mu + n sigma) | 0.40％ |
The final false alarm probability in table 4 is 0.40%, which shows that the flow rate diagnosis method of the EGR system of the present invention can reliably diagnose the high flow rate fault of the EGR system and has substantially no risk of false alarm.
The flow rate diagnosis method for the EGR system according to the present invention is not limited to the high-pressure EGR system, and is also applicable to a low-pressure EGR system in which an outlet temperature sensor is mounted near an outlet of an EGR valve as required.
In summary, the flow diagnosis method of the EGR system according to the present invention does not use the pressure change in the pipe of the EGR system as the basis for the flow diagnosis, but uses the temperature of the outlet of the EGR valve and the temperature of the intake pipe in different states as the basis for the flow diagnosis, and is simple and easy to implement, and simultaneously uses different diagnosis logics to perform the high flow diagnosis and the low flow diagnosis respectively, and superimposes the judgment whether the various parameters meet or exceed the standard in the high flow diagnosis stage and the low flow diagnosis stage respectively, so that the diagnosis result is more reliable and effective, and the corresponding high flow diagnosis or the low flow diagnosis can be performed under various working conditions of the engine, thereby enabling the corresponding engine (including the engine lacking the fuel cut-off working condition) to meet the requirements of the IUPR rate in the CN6 regulation.
Based on the same inventive concept, an embodiment of the present invention further provides a flow diagnostic apparatus of an EGR system, referring to fig. 10, the flow diagnostic apparatus of the EGR system includes a monitoring module 31, a low flow diagnostic module 32, and a high flow diagnostic module 33.
The monitoring module 31 includes an engine water temperature sensor 311, an EGR valve switch monitor 312, an outlet temperature sensor 313, and an intake line temperature sensor 314. Engine water temperature sensor 311 is used for monitoring EGR system's engine water temperature, EGR valve switch monitor 312 is used for monitoring opening and closing of EGR system's EGR valve, and outlet temperature sensor 313 sets up the export one side of EGR valve is used for gathering (or monitoring) EGR valve switch monitor 312 the outlet temperature of EGR valve, intake pipe temperature sensor 314 sets up the intake pipe of EGR system is gone up and is used for gathering (or monitoring) the intake pipe temperature of EGR system. The engine water temperature sensor 311, the EGR valve switch monitor 312, the outlet temperature sensor 313, and the intake pipe temperature sensor 314 may transmit the respective monitoring results to the respective units of the low flow diagnostic module 32 and the high flow diagnostic module 33.
The low flow diagnosis module 32 is configured to, after an engine water temperature of the EGR system exceeds a preset temperature threshold and an EGR valve closing period of the EGR system exceeds a calibration period, once a deviation between an outlet temperature of the EGR valve and an intake pipe temperature of the EGR system is smaller than a calibration temperature difference value, take the outlet temperature and the intake pipe temperature at that time as an initial outlet temperature and an initial intake pipe temperature of the low flow diagnosis, respectively, and thereafter, when it is determined that a target flow of the EGR valve exceeds a calibration flow, perform a first flow integral on the target flow of the EGR valve, and after the first flow integral exceeds a first preset integral threshold, determine whether a variation amount of a current outlet temperature of the EGR valve is smaller than a preset variation threshold, and determine whether a deviation between the current outlet temperature of the EGR valve and the intake pipe temperature is smaller than a preset deviation threshold, and if the flow rate is less than the preset flow rate, reporting a low flow rate fault.
The high flow diagnosis module 33 is configured to perform a second flow integral on the target flow of the EGR valve after the ERG valve is opened, and after the second flow integral exceeds a second preset integral threshold, take the temperature of the outlet of the EGR valve collected when the EGR valve is turned from open to closed as an initial temperature for high flow diagnosis, and when the state of the EGR system after collecting the initial temperature can satisfy a preset state condition and can be maintained above a calibration duration, determine whether a decrease amount of the temperature of the outlet of the EGR valve after closing of the EGR valve relative to the initial temperature is smaller than a preset decrease amount threshold, and if so, report a high flow fault.
It will be appreciated that the low flow diagnostic module 32 and the high flow diagnostic module 32 may be implemented in a single large module, for example, with the low flow diagnostic module 32 and the high flow diagnostic module 33 each integrated into a corresponding engine management system for the engine. Alternatively, any one of the low-flow diagnostic module 32 and the high-flow diagnostic module 32 may be split into a plurality of sub-modules (i.e., units). Alternatively, at least a portion of the functionality of one of the low-flow diagnostic module 32 and the high-flow diagnostic module 32 may be combined with at least a portion of the functionality of the other module and implemented in a respective module. Further, at least one of the low-flow diagnostic module 32 and the high-flow diagnostic module 32 may be implemented at least in part as a hardware circuit, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or in hardware or firmware in any other reasonable manner to integrate or package a circuit, or in a suitable combination of software, hardware, and firmware implementations. Alternatively, at least one of the low flow diagnostic module 32 and the high flow diagnostic module 32 may be implemented at least in part as a computer program module that, when executed by a computer, may perform the functions of the respective module.
Referring to fig. 10, in the present embodiment, each of the low-flow diagnosis module 32 and the high-flow diagnosis module 32 is implemented by being split into a plurality of units. Specifically, the low flow diagnosis module 32 includes an initial sampling condition determination unit 321, a low flow initial temperature sampling unit 322, a target flow determination unit 323, a first flow integration and determination unit 324, and a low flow diagnosis and error reporting unit 325. The initial sampling condition determining unit 321 is configured to determine whether the current state of the EGR system satisfies a preset initial sampling condition for triggering the low flow diagnosis according to the monitoring result of the monitoring module 31, where the preset initial sampling condition includes three items: (1) the water temperature of an engine of the EGR system exceeds a preset temperature threshold; (2) the closing time of an EGR valve of the EGR system exceeds the calibration time; (3) the difference (i.e., the deviation) between the current EGR valve outlet temperature and the EGR system inlet line temperature is less than the nominal temperature difference. If the current state of the EGR system satisfies the three initial sampling conditions at the same time, the initial sampling condition determining unit 321 determines that the current state of the EGR system satisfies the initial sampling condition of the low flow diagnosis, and may trigger the low flow diagnosis operation, i.e., the low flow diagnosis enable operation, so that the low flow initial temperature sampling unit 322 operates. The low-flow initial temperature sampling unit 322 is configured to use the EGR valve outlet temperature and the intake pipe temperature collected when the EGR meets a preset initial sampling condition as an initial outlet temperature and an initial intake pipe temperature (i.e., an initial temperature sampling value) for low-flow diagnosis, respectively, and then complete initial temperature sampling. The target flow rate determining unit 323 is configured to determine whether the target flow rate of the EGR valve exceeds the calibrated flow rate after the initial temperature sampling unit 322 collects the initial temperature sampling value, and clear the previous first flow rate integral when it is determined that the target flow rate of the EGR valve does not exceed the calibrated flow rate. The first flow integral and judgment unit 324 is configured to perform first flow integral on the target flow when the target flow judgment unit 323 judges that the target flow exceeds the calibrated flow, calculate a variation of the intake pipe temperature at this moment with respect to the initial intake pipe temperature at an initial time of performing the first flow integral, record the variation as an initial intake pipe temperature difference, and further judge whether the first flow integral exceeds a first preset integral threshold. The low flow diagnosis and error reporting unit 325 is configured to, after the first flow integral and determination unit 324 determines that the first flow integral exceeds the first preset integral threshold, determine whether a variation of the current EGR valve outlet temperature is smaller than a preset variation threshold, determine whether a deviation between the current EGR valve outlet temperature and the intake pipe temperature is smaller than a preset deviation threshold, and report a low flow fault if both determination results are "yes" (i.e., both are smaller); if one judgment result is yes and the other judgment result is no, returning to the target flow judgment unit 323; if the two judgment results are both negative, the EGR low flow diagnosis is finished and the diagnosis result of no low flow fault is reported. The diagnostic and error reporting unit 325 calculates an amount of change in the current outlet temperature of the EGR valve equal to the current outlet temperature of the EGR valve while subtracting the initial outlet temperature and the initial intake conduit temperature differential.
The high flow diagnosis module 33 includes a second flow integration and determination unit 331, a high flow initial temperature sampling unit 332, and a high flow diagnosis and error reporting unit 333. The second flow integration and determination unit 331 is configured to perform second flow integration on the target flow of the EGR valve after the monitoring module 31 monitors that the EGR valve is opened, and determine whether the second flow integration exceeds a second preset integration threshold. The high flow initial temperature sampling unit 332 is configured to, when the second flow integral and the determining unit 331 determines that the second flow integral exceeds the second preset integral threshold and the monitoring module 31 monitors that the EGR valve is turned from open to closed, use the EGR valve outlet temperature collected by the monitoring module 31 when the EGR valve is turned from open to closed as the initial temperature of the high flow diagnosis. The high flow diagnosis and error reporting unit 333 is configured to, after the initial temperature of the high flow diagnosis is acquired by the high flow initial temperature sampling unit 332, determine whether the state of the EGR system can meet a preset state condition and can be maintained above a calibration time period according to the monitoring result of the monitoring module 31, if so, report a high flow fault further when a decrease amount of the outlet temperature of the EGR valve after the EGR valve is closed with respect to the initial temperature is less than a preset decrease amount threshold, and report a diagnosis result of "the EGR high flow diagnosis is completed and there is no high flow fault" when the decrease amount of the outlet temperature of the EGR valve after the EGR valve is closed with respect to the initial temperature is greater than or equal to the preset decrease amount threshold; if not, the flow returns to the second flow integration and determination unit 331. Wherein the preset state conditions include: a) the acceleration of the engine is smaller than a preset threshold acceleration; b) the EGR valve is closed; and, c) the engine water temperature is above the preset temperature threshold.
Based on the same inventive concept, an embodiment of the present invention further provides an EGR system, please refer to fig. 1 and fig. 10, which includes an air cleaner 101, a supercharger 102, a throttle 103, an EGR valve 104, an EGR intercooler 105, an engine 106, a turbine 107, a catalyst 108, a particulate filter 109, and a flow diagnostic device of the EGR system as described in fig. 10. The air conditioner comprises an air filter 101, a supercharger 102 and a throttle valve 103, wherein the air filter 101, the supercharger 102 and the throttle valve 103 form an air inlet pipeline connected with an air inlet of an engine, specifically, an air outlet of the air filter 101 is communicated with an air inlet of the engine 106 through an air cavity of the supercharger 102 and the throttle valve 103 to provide an air source for the engine 106, and an air inlet pipeline temperature sensor 110 is arranged on a pipeline between the throttle valve 103 and the air inlet of the engine 106 to collect the temperature of the air inlet pipeline; the turbine 107, the catalyst 108 and the particulate filter 109 form an exhaust pipeline connected with an exhaust port of the engine, specifically, the exhaust port of the engine 106 is communicated with an air inlet of the particulate filter 109 through an exhaust gas cavity of the turbine 107 and the catalyst 108 so as to discharge exhaust gas combusted by the engine 106; the EGR valve 104 and the EGR intercooler 105 constitute an EGR line disposed between the exhaust line and the intake line, the EGR intercooler 105 is connected to an exhaust port of the engine 107 to extract a part of exhaust gas in front of the turbine 107 and send the extracted exhaust gas to the front of an intake port of the engine 106 through the EGR valve 104 (i.e., an exhaust gas recirculation flow control valve) to be uniformly mixed with gas output from the throttle valve 104, and then the mixture is introduced into the engine 4 for combustion, the EGR valve 104 is used for adjusting the flow rate of EGR gas in the EGR line, and the EGR valve outlet temperature sensor 111 is disposed on a line between an outlet of the EGR valve 104 and the intake port of the engine 106 and used for collecting the outlet temperature of the EGR valve 104. The throttle valve 103 (may be referred to as a throttle valve) whose opening degree can be driven by a stepping motor and monitored by a throttle valve sensor for detecting the opening degree of the throttle valve, and the stepping motor can be driven in accordance with the operation of an accelerator pedal by a driver to thereby adjust the opening degree of the throttle valve 103. The flow diagnostic device of the EGR system diagnoses the flow fault of the EGR valve 104 according to the monitoring result of the monitoring module 31.
Referring to fig. 10, an embodiment of the present invention further provides an engine management system including a sensor assembly (not shown), a flow diagnostic device of an EGR system as shown in fig. 10, and a controller (not shown). The sensor assembly is configured to monitor at least one parameter of an engine in the EGR system including rotational speed, acceleration, water temperature, and intake air amount. The controller is configured to control operations of the engine, an EGR valve of the EGR system, and the flow rate diagnosing device, and control a fuel supply amount, based on a monitoring result of the sensor assembly and a monitoring result of a monitoring module 31 in the flow rate diagnosing device.
Based on the same inventive concept, an embodiment of the invention further provides an automobile, which comprises the EGR system and/or the engine management system.
Based on the same inventive concept, an embodiment of the present invention also provides a computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the EGR system diagnosis method according to the present invention and any variation thereof. The computer storage medium may be any medium that can contain, store, communicate, propagate, or transport the instructions. For example, the computer storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium. Specific examples of the computer storage medium include: magnetic storage devices, such as magnetic tape or Hard Disk Drives (HDDs); optical storage devices, such as compact disks (CD-ROMs); a memory, such as a Random Access Memory (RAM) or a flash memory; and/or wired/wireless communication links.
In summary, the flow rate diagnosing apparatus for an EGR system, the engine management system, the computer-readable storage medium, and the automobile of the present invention do not perform the flow rate diagnosis based on the pressure change in the pipe of the EGR system, but the flow diagnosis is carried out by taking the outlet temperature of the EGR valve and the temperature of the air inlet pipeline under different states as the basis, the method is simple and easy to implement, and simultaneously, different diagnosis logics are adopted to carry out high flow diagnosis and low flow diagnosis respectively, and the judgment whether the various parameters reach the standard or exceed the standard is respectively superposed in the high flow diagnosis stage and the low flow diagnosis stage, therefore, the diagnosis result is more reliable and effective, the corresponding high flow diagnosis or low flow diagnosis can be carried out under various working conditions of the engine, so that the corresponding engine (including the engine lacking the fuel cut-off condition) can also meet the requirements of the IUPR rate in the CN6 regulation.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (16)
1. A flow diagnostic method for an EGR system, comprising:
a low flow diagnosis stage: monitoring whether the EGR system meets a preset initial sampling condition, respectively taking the EGR valve outlet temperature of the EGR system and the air inlet pipeline temperature of the EGR system which are collected at the moment as the initial outlet temperature and the initial air inlet pipeline temperature of low flow diagnosis once the EGR system meets the preset initial sampling condition, performing first flow integral on the target flow of the EGR valve when the target flow of the EGR valve is judged to exceed a calibrated flow, judging whether the variation of the current EGR valve outlet temperature is smaller than a preset variation threshold value or not after the first flow integral exceeds a first preset integral threshold value, judging whether the deviation between the current EGR valve outlet temperature and the current air inlet pipeline temperature is smaller than a preset deviation threshold value or not, and reporting a low flow fault if the deviation is smaller than the preset deviation threshold value; and the number of the first and second groups,
a high flow diagnosis stage: after the ERG valve is opened, performing second flow integral on the target flow of the EGR valve, taking the temperature of the outlet of the EGR valve, which is acquired when the EGR valve is turned from open to close, as the initial temperature of high flow diagnosis after the second flow integral exceeds a second preset integral threshold, and when the state of the EGR system, which is acquired after the initial temperature is acquired, can meet preset state conditions and can be maintained above a calibration duration, judging whether the drop of the temperature of the outlet of the EGR valve, which is closed after the EGR valve, relative to the initial temperature is smaller than a preset drop threshold, and if so, reporting a high flow fault.
2. The flow diagnostic method according to claim 1, wherein in the low flow diagnostic phase, the preset initial sampling conditions include: the temperature of the engine water of the EGR system exceeds a preset temperature threshold value, the closing time of the EGR valve of the EGR system exceeds a calibration time, and the deviation between the outlet temperature of the EGR valve and the temperature of the air inlet pipeline is smaller than a calibration temperature difference value.
3. The flow rate diagnostic method according to claim 1, characterized in that in the low flow rate diagnostic phase, the amount of change in the intake pipe temperature at that moment from the initial intake pipe temperature at the initial time of the first flow rate integration is calculated and recorded as an initial intake pipe temperature difference; after the first flow integral exceeds a first preset integral threshold, the amount of change in the current EGR valve outlet temperature is equal to the current EGR valve outlet temperature while subtracting the initial outlet temperature and the initial intake conduit temperature differential.
4. The flow diagnostic method according to claim 1, characterized in that in the low flow diagnostic phase, after the initial outlet temperature and initial intake line temperature are collected, when it is determined that the target flow of the EGR valve does not exceed the calibrated flow, the corresponding first flow integral is cleared.
5. The flow rate diagnostic method according to claim 1, characterized in that in the high flow rate diagnostic phase, the preset state conditions include: the acceleration of the engine is less than a preset threshold acceleration, the EGR valve is closed, and the engine water temperature is greater than the preset temperature threshold.
6. The flow diagnostic method according to claim 1, characterized in that in the high flow diagnostic phase, the initial temperature of the high flow diagnostic is reacquired when the state of the EGR system after the initial temperature has been acquired fails to satisfy a preset state condition, or when the state of the EGR system after the initial temperature has been acquired can satisfy a preset state condition but cannot be maintained above a calibrated duration.
7. A flow diagnostic device for an EGR system, comprising:
a monitoring module configured to monitor an engine water temperature of the EGR system, an opening and closing of an EGR valve of the EGR system, an EGR valve outlet temperature, an intake line temperature of the EGR system, respectively;
a low flow diagnostic module configured to determine whether the EGR system satisfies a preset initial sampling condition according to a monitoring result of the monitoring module, and upon determination of satisfaction, the EGR valve outlet temperature of the EGR system and the air inlet pipeline temperature of the EGR system collected by the monitoring module at the moment are respectively used as the initial outlet temperature and the initial air inlet pipeline temperature of the low flow diagnosis, and when the target flow of the EGR valve is judged to exceed the calibration flow, performing a first flow integral on a target flow of the EGR valve, and judging whether the current variation of the EGR valve outlet temperature is smaller than a preset variation threshold value after the first flow integral exceeds a first preset integral threshold value, judging whether the deviation between the current EGR valve outlet temperature and the current air inlet pipeline temperature is smaller than a preset deviation threshold value or not, and if so, reporting a low-flow fault; and the number of the first and second groups,
the high flow diagnosis module is configured to perform second flow integral on the target flow of the EGR valve after the ERG valve is opened, and after the second flow integral exceeds a second preset integral threshold, take the outlet temperature of the EGR valve, which is collected when the EGR valve is turned from open to close, as the initial temperature of high flow diagnosis, and when the state of the EGR system after the initial temperature is collected can meet preset state conditions and can be maintained above a calibration duration, judge whether the decrease of the outlet temperature of the EGR valve after the EGR valve is closed relative to the initial temperature is smaller than a preset decrease threshold, and if so, report a high flow fault.
8. The flow diagnostic apparatus of claim 7, wherein the monitoring module includes an outlet temperature sensor disposed on an outlet side of the EGR valve and an intake line temperature sensor disposed on an intake line of the EGR system.
9. The flow diagnostic device according to claim 7, wherein in the low flow diagnostic module, the preset initial sampling conditions include: the temperature of the engine water of the EGR system exceeds a preset temperature threshold value, the closing time of the EGR valve of the EGR system exceeds a calibration time, and the deviation between the outlet temperature of the EGR valve and the temperature of the air inlet pipeline is smaller than a calibration temperature difference value.
10. The flow diagnostic apparatus according to claim 7, characterized in that in the low flow diagnostic module, an amount of change in the intake pipe temperature at that moment from the initial intake pipe temperature at the initial time of the first flow integration is calculated as an initial intake pipe temperature difference; after the first flow integral exceeds a first preset integral threshold, the amount of change in the current EGR valve outlet temperature is equal to the current EGR valve outlet temperature while subtracting the initial outlet temperature and the initial intake conduit temperature differential.
11. The flow diagnostic device according to claim 7, wherein in the high flow diagnostic module, the preset status condition comprises: the acceleration of the engine is smaller than a preset threshold acceleration; the EGR valve is closed; and the engine water temperature is higher than the preset temperature threshold.
12. The flow diagnostic device according to claim 7, wherein the low flow diagnostic module and the high flow diagnostic module are each integrated into a corresponding engine management system of the engine.
13. An EGR system, comprising:
an engine;
an intake line connected to an intake port of the engine;
an exhaust line connected to an exhaust port of the engine;
the EGR pipeline is provided with an EGR valve and is arranged between the exhaust pipeline and the air inlet pipeline; and the number of the first and second groups,
an EGR system flow diagnostic device according to any of claims 7 to 12.
14. An engine management system, comprising:
a sensor assembly configured to monitor at least one parameter of an engine in the EGR system including a speed, an acceleration, a water temperature, and an intake air amount;
the flow rate diagnosis device of an EGR system according to any one of claims 7 to 12, and,
and a controller configured to control operations of the engine, an EGR valve of the EGR system, and the flow rate diagnosing device, and to control a fuel supply amount, based on a monitoring result of the sensor assembly and a monitoring result of a monitoring module in the flow rate diagnosing device.
15. A vehicle comprising an EGR system according to claim 13, and/or an engine management system according to claim 14.
16. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of diagnosing an EGR system according to any one of claims 1 to 6.
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