CN113958431A - Diagnosis method for engine EGR flow abnormity - Google Patents
Diagnosis method for engine EGR flow abnormity Download PDFInfo
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- CN113958431A CN113958431A CN202111120506.2A CN202111120506A CN113958431A CN 113958431 A CN113958431 A CN 113958431A CN 202111120506 A CN202111120506 A CN 202111120506A CN 113958431 A CN113958431 A CN 113958431A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000003745 diagnosis Methods 0.000 title claims abstract description 12
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- 230000005856 abnormality Effects 0.000 claims description 12
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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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 discloses a method for diagnosing abnormal EGR flow of an engine. Including according to target EGR flow Megr_dWith actual EGR flow Megr_actDifference between or target fresh air flow rate Mair_dWith the actual fresh air flow Mair_actThe difference value between the two is controlled by an EGR flow closed-loop control system, and the EGR valve is controlled if the position of the EGR valve is requiredpos_dIf the limit position has been reached or the corrective adjustments to the closed loop control system for EGR flow are saturated, a diagnosis of EGR flow rationality is made. According to the method, after the limit regulation and control capability of the EGR flow is judged, the rationality of the EGR flow is diagnosed, and the accuracy of fault diagnosis is further improved.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a diagnosis method for engine EGR flow abnormity.
Background
With the global environmental pollution and the increasing energy crisis, regulations limiting engine emissions continue to tighten. The EGR (exhaust gas recirculation) technology can reduce nitrogen oxides by reducing the oxygen concentration during combustion and the maximum temperature of combustion in the cylinder, and can improve fuel economy under low load conditions, so that the EGR technology is widely applied to meet the emission regulation requirements by introducing the EGR technology in the sixth emission regulation stage in China.
Patent CN202010089387.8, provides an EGR flow diagnostic method, which comprises: detecting the total intake air flow rate of an intake manifold, the engine speed n and the gas temperature T of the intake manifoldmAnd actual pressure P of intake manifoldm_measure(ii) a Engine speed n according to total intake flow rate and gas temperature T of intake manifoldmCalculating theoretical pressure P of intake manifoldm_calculate(ii) a Will the actual pressure P of the intake manifoldm_measureTheoretical pressure P with intake manifoldm_calculateComparing; when actual pressure P of intake manifoldm_measureTheoretical pressure P with intake manifoldm_calculateWhen the absolute difference value of the EGR flow rate is smaller than or equal to a first preset threshold value, the EGR flow rate is confirmed to be in a normal state; when actual pressure P of intake manifoldm_measureLess than the theoretical pressure P of the intake manifoldm_calculateAnd the actual pressure P of the intake manifoldm_measureTheoretical pressure P with intake manifoldm_calculateWhen the absolute difference value of the EGR flow is greater than or equal to a second preset threshold value, the EGR flow is determined to be a low flow fault; when actual pressure P of intake manifoldm_measureGreater than the theoretical pressure P of the intake manifoldm_calculateAnd the actual pressure P of the intake manifoldm_measureTheoretical pressure P with intake manifoldm_calculateWhen the absolute difference of (d) is greater than or equal to a third preset threshold, then the EGR flow is confirmed to be a high flow fault.
In the prior art, the EGR system has the following problems:
during the working process of the engine, if the EGR flow is too high, excessive exhaust gas enters an engine cylinder, so that combustion deterioration is caused, and the emission of particulate matters and the like exceeds the standard, and if the EGR flow is too low, less exhaust gas enters the engine cylinder, so that the emission of nitrogen oxides exceeds the standard. There is therefore a need to monitor the flow of EGR to ensure that a reasonable amount of exhaust gas enters the engine cylinder to participate in combustion, improving engine emissions and fuel economy.
Disclosure of Invention
The present invention is directed to a method for diagnosing an engine EGR flow abnormality, which solves the above-mentioned drawbacks of the background art.
The technical scheme adopted by the invention is as follows: the method for diagnosing the abnormal EGR flow of the engine comprises the step of diagnosing the abnormal EGR flow according to a target EGR flow Megr_dWith actual EGR flow Megr_actDifference between or target fresh air flow rate Mair_dWith the actual fresh air flow Mair_actThe difference value between the two EGR valves is controlled by an EGR flow closed-loop control system, the difference value is reduced along with the adjustment of the control system, and the EGR valve needs to be positioned if the EGR valve needs to be positionedpos_dThe diagnosis of EGR flow rationality is made when the limit position has been reached or the corrective adjustment of the EGR flow closed-loop control system is saturated, i.e., the EGR valve opening cannot be further increased or decreased to reach the target flow.
If in the diagnosis window of higher EGR flow, the actual EGR flow Megr_actHigher than EGR flow by preset threshold Megr_highDetermining the EGR flow higher fault; if in the diagnostic window of lower EGR flow, the actual EGR flow Megr_actLower than preset threshold M of EGR flowegr_lowThen a low EGR flow fault is determined.
The method specifically comprises the following steps:
step 1: obtaining the actual fresh air flow M by an air flow sensorair_act；
Step 2: calculating total intake air quantity M of the intake manifold according to the engine speed n, the gas pressure P of the intake manifold and the gas temperature T of the intake manifoldtot；
And step 3: according to total intake air quantity M of an intake manifoldtotMinus the actual fresh air flow Mair_actObtaining an actual EGR flow Megr_act；
And 4, step 4: based on calibration of the engine, the target fresh air flow M under each working condition is obtained according to the emission targetair_d；
And 5: according to the actual fresh air flow Mair_actMinus the target fresh air flow Mair_dObtaining a fresh air flow control error Mair_errBased on fresh air flow control error Mair_errClosed-loop control of EGR flow, when Mair_actGreater than Mair_dI.e. Mair_errIf the EGR flow is larger than zero, the EGR flow is lower, and the opening of the EGR valve is increased to increase the EGR flow; when M isair_actLess than Mair_dI.e. Mair_errIf the EGR flow is smaller than zero, the EGR flow is higher, and the opening of the EGR valve is reduced to reduce the EGR flow.
In the step 5, for the low EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is larger than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR valve is positioned at the required positionpos_dEGR having been opened to a preset limit position at which EGR valve is openedpos_o，EGRpos_d>EGRpos_o(the larger the set number, the larger the EGR valve is opened), and if the actual EGR flow rate M is larger at that timeegr_actLower than preset threshold M of EGR flowegr_lowIf so, it is determined that the EGR flow rate is relatively low.
In the step 5, for the low EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is larger than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR closed-loop control parameter R isctrlAlready saturated (opening direction), EGR closed-loop control parameter RctrlGreater than the upper limit R of EGR closed-loop controlctrl_max(the larger the set number is, the more the EGR valve is opened, the actual EGR flow M is adjusted and controlled) at the momentegr_actLower than preset threshold M of EGR flowegr_lowIf so, it is determined that the EGR flow rate is relatively low.
In the step 5, for the higher EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is less than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR valve is positioned at the required positionpos_dEGR having been closed to a preset limit position at which EGR valve is closedpos_c，EGRpos_d<EGRpos_c(the smaller the set number, the closer the EGR valve is to the closing direction), if the actual EGR flow M at that timeegr_actHigher than EGR flow by preset threshold Megr_highIf so, the EGR flow is judged to be higher.
In the step 5, for the higher EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is less than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR closed-loop control parameter R isctrlAlready saturated (closing direction), EGR closed-loop control parameter RctrlLess than lower limit R of EGR closed-loop controlctrl_min(the smaller the set number, the more the EGR valve is closed, the actual EGR flow Megr_actHigher than EGR flow by preset threshold Megr_highIf so, the EGR flow is judged to be higher.
EGR flow low preset threshold Megr_lowAnd EGR flow is higher than preset threshold Megr_highEGR valve open Preset Limit position EGRpos_oAnd EGR valve closing preset limit position EGRpos_cIs based on engine calibration, obtained from emission targets.
Upper limit of EGR closed-loop control Rctrl_maxAnd EGR closed-loop control lower limit Rctrl_minIs derived based on the characteristics of the EGR closed loop control system of the engine.
The diagnostic range requires setting at a steady state condition to ensure that the EGR closed loop control system has sufficient time to make adjustments at that condition.
According to the method, after the limit regulation and control capability of the EGR flow is judged, the rationality of the EGR flow is diagnosed, and the accuracy of fault diagnosis is further improved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
figure 2 is a flow chart of an EGR flow rationality diagnostic,
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1, the engine EGR flow closed-loop control system of the present invention includes an EGR valve 1, a throttle valve 2, a supercharger 3, an intercooler 4, an air cleaner 5, an air flow sensor 6, a temperature sensor (not shown), a pressure sensor (not shown), and the like, and implements closed-loop control of the EGR flow.
As shown in FIG. 2, a method for diagnosing an engine EGR flow abnormality includes determining a target EGR flow Megr_dWith actual EGR flow Megr_actDifference between or target fresh air flow rate Mair_dWith the actual fresh air flow Mair_actThe difference value between the two EGR valves is controlled by an EGR flow closed-loop control system, the difference value is reduced along with the adjustment of the control system, and the EGR valve needs to be positioned if the EGR valve needs to be positionedpos_dThe diagnosis of EGR flow rationality is made when the limit position has been reached or the corrective adjustment of the EGR flow closed-loop control system is saturated, i.e., the EGR valve opening cannot be further increased or decreased to reach the target flow.
If in the diagnosis window of higher EGR flow, the actual EGR flow Megr_actHigher than EGR flow by preset threshold Megr_highDetermining the EGR flow higher fault; if in the diagnostic window of lower EGR flow, the actual EGR flow Megr_actLower than preset threshold M of EGR flowegr_lowThen a low EGR flow fault is determined.
The method specifically comprises the following steps:
step 1: obtaining the actual fresh air flow M by an air flow sensorair_act；
Step 2: calculating total intake air quantity M of the intake manifold according to the engine speed n, the gas pressure P of the intake manifold and the gas temperature T of the intake manifoldtot；
And step 3: according to total intake air quantity M of an intake manifoldtotMinus the actual fresh air flow Mair_actObtaining an actual EGR flow Megr_act；
And 4, step 4: based on engine calibration, based on emission target acquisitionTarget fresh air flow M under each working conditionair_d；
And 5: according to the actual fresh air flow Mair_actMinus the target fresh air flow Mair_dObtaining a fresh air flow control error Mair_errBased on fresh air flow control error Mair_errClosed-loop control of EGR flow, when Mair_actGreater than Mair_dI.e. Mair_errIf the EGR flow is larger than zero, the EGR flow is lower, and the opening of the EGR valve is increased to increase the EGR flow; when M isair_actLess than Mair_dI.e. Mair_errIf the EGR flow is smaller than zero, the EGR flow is higher, and the opening of the EGR valve is reduced to reduce the EGR flow.
In the step 5, for the low EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is larger than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR valve is positioned at the required positionpos_dEGR having been opened to a preset limit position at which EGR valve is openedpos_o，EGRpos_d>EGRpos_o(the larger the set number, the larger the EGR valve is opened), and if the actual EGR flow rate M is larger at that timeegr_actLower than preset threshold M of EGR flowegr_lowIf so, it is determined that the EGR flow rate is relatively low.
In the step 5, for the low EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is larger than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR closed-loop control parameter R isctrlAlready saturated (opening direction), EGR closed-loop control parameter RctrlGreater than the upper limit R of EGR closed-loop controlctrl_max(the larger the set number is, the more the EGR valve is opened, the actual EGR flow M is adjusted and controlled) at the momentegr_actLower than preset threshold M of EGR flowegr_lowIf so, it is determined that the EGR flow rate is relatively low.
In the step 5, for the higher EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is less than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR valve is positioned at the required positionpos_dHas been turned offEGR to EGR valve closing preset limit positionpos_c，EGRpos_d<EGRpos_c(the smaller the set number, the closer the EGR valve is to the closing direction), if the actual EGR flow M at that timeegr_actHigher than EGR flow by preset threshold Megr_highIf so, the EGR flow is judged to be higher.
In the step 5, for the higher EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is less than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR closed-loop control parameter R isctrlAlready saturated (closing direction), EGR closed-loop control parameter RctrlLess than lower limit R of EGR closed-loop controlctrl_min(the smaller the set number, the more the EGR valve is closed, the actual EGR flow Megr_actHigher than EGR flow by preset threshold Megr_highIf so, the EGR flow is judged to be higher.
EGR flow low preset threshold Megr_lowAnd EGR flow is higher than preset threshold Megr_highEGR valve open Preset Limit position EGRpos_oAnd EGR valve closing preset limit position EGRpos_cIs based on engine calibration, obtained from emission targets.
Upper limit of EGR closed-loop control Rctrl_maxAnd EGR closed-loop control lower limit Rctrl_minIs derived based on the characteristics of the EGR closed loop control system of the engine.
The diagnostic range requires setting at a steady state condition to ensure that the EGR closed loop control system has sufficient time to make adjustments at that condition.
Here, it should be noted that the description of the above technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims.
Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.
Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A method for diagnosing an engine EGR flow abnormality, characterized in that: including according to target EGR flow Megr_dWith actual EGR flow Megr_actDifference between or target fresh air flow rate Mair_dWith the actual fresh air flow Mair_actThe difference value between the two is controlled by an EGR flow closed-loop control system, and the EGR valve is controlled if the position of the EGR valve is requiredpos_dIf the limit position has been reached or the corrective adjustments to the closed loop control system for EGR flow are saturated, a diagnosis of EGR flow rationality is made.
2. The method of diagnosing an engine EGR flow abnormality according to claim 1, characterized in that: if in the diagnosis window of higher EGR flow, the actual EGR flow Megr_actHigher than EGR flow by preset threshold Megr_highDetermining the EGR flow higher fault; if in the diagnostic window of lower EGR flow, the actual EGR flow Megr_actLower than preset threshold M of EGR flowegr_lowThen a low EGR flow fault is determined.
3. The method of diagnosing an engine EGR flow abnormality according to claim 2, characterized in that: the method specifically comprises the following steps:
step 1: obtaining the actual fresh air flow M by an air flow sensorair_act；
Step 2: calculating total intake air quantity M of the intake manifold according to the engine speed n, the gas pressure P of the intake manifold and the gas temperature T of the intake manifoldtot；
And step 3: according to total intake air quantity M of an intake manifoldtotMinus the actual fresh air flow Mair_actObtaining an actual EGR flow Megr_act；
And 4, step 4: based on calibration of the engine, the target fresh air flow M under each working condition is obtained according to the emission targetair_d；
And 5: according to the actual fresh air flow Mair_actMinus the target fresh air flow Mair_dObtaining a fresh air flow control error Mair_errBased on fresh air flow control error Mair_errClosed-loop control of EGR flow, when Mair_actGreater than Mair_dI.e. Mair_errIf the EGR flow is larger than zero, the EGR flow is lower, and the opening of the EGR valve is increased to increase the EGR flow; when M isair_actLess than Mair_dI.e. Mair_errIf the EGR flow is smaller than zero, the EGR flow is higher, and the opening of the EGR valve is reduced to reduce the EGR flow.
4. The method of diagnosing an engine EGR flow abnormality according to claim 3, characterized in that: in the step 5, for the low EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is larger than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR valve is positioned at the required positionpos_dEGR having been opened to a preset limit position at which EGR valve is openedpos_o，EGRpos_d>EGRpos_oIf the actual EGR flow rate M is presentegr_actLower than preset threshold M of EGR flowegr_lowIf so, it is determined that the EGR flow rate is relatively low.
5. The method of diagnosing an engine EGR flow abnormality according to claim 3, characterized in that: in the step 5, for the low EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is larger than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR closed-loop control parameter R isctrlSaturated, EGR closed-loop control parameter RctrlGreater than the upper limit R of EGR closed-loop controlctrl_maxIf the actual EGR flow rate M is presentegr_actLower than preset threshold M of EGR flowegr_lowIf so, it is determined that the EGR flow rate is relatively low.
6. The method of diagnosing an engine EGR flow abnormality according to claim 3, characterized in that: in the step 5, for the higher EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is less than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR valve is positioned at the required positionpos_dEGR having been closed to a preset limit position at which EGR valve is closedpos_c，EGRpos_d<EGRpos_cIf the actual EGR flow rate M is presentegr_actHigher than EGR flow by preset threshold Megr_highIf so, the EGR flow is judged to be higher.
7. The method of diagnosing an engine EGR flow abnormality according to claim 3, characterized in that: in the step 5, for the higher EGR flow, the fresh air flow control error Mair_errWhen the EGR flow is less than zero, the EGR flow closed-loop control system controls the EGR valve, and if the EGR flow closed-loop control system is adjusted to the limit, the EGR closed-loop control parameter R isctrlSaturated, EGR closed-loop control parameter RctrlLess than lower limit R of EGR closed-loop controlctrl_minIf the actual EGR flow rate M is presentegr_actHigher than EGR flow by preset threshold Megr_highIf so, the EGR flow is judged to be higher.
8. The method of diagnosing an engine EGR flow abnormality according to claim 4 or 6, characterized in that: EGR flow low preset threshold Megr_lowAnd EGR flow is higher than preset threshold Megr_highEGR valve open Preset Limit position EGRpos_oAnd EGR valve closing preset limit position EGRpos_cIs based on engine calibration, obtained from emission targets.
9. The method of diagnosing an engine EGR flow abnormality according to claim 5 or 7, characterized in that: upper limit of EGR closed-loop control Rctrl_maxAnd EGR closed-loop control lower limit Rctrl_minIs based on EGR closed-loop control system of engineSex retrieval.
10. The method of diagnosing an engine EGR flow abnormality according to claim 1, characterized in that: the diagnostic range requires setting at a steady state condition to ensure that the EGR closed loop control system has sufficient time to make adjustments at that condition.
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Application publication date: 20220121 |