CN115013131B - DPF state monitoring method and device and vehicle - Google Patents
DPF state monitoring method and device and vehicle Download PDFInfo
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- CN115013131B CN115013131B CN202210886653.9A CN202210886653A CN115013131B CN 115013131 B CN115013131 B CN 115013131B CN 202210886653 A CN202210886653 A CN 202210886653A CN 115013131 B CN115013131 B CN 115013131B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011144 upstream manufacturing Methods 0.000 claims description 114
- 238000012937 correction Methods 0.000 claims description 63
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 45
- 229910052799 carbon Inorganic materials 0.000 claims description 45
- 230000008859 change Effects 0.000 claims description 31
- 238000003745 diagnosis Methods 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 16
- 238000009530 blood pressure measurement Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention belongs to the technical field of engine aftertreatment, and discloses a DPF state monitoring method, a device and a vehicle.
Description
Technical Field
The invention relates to the technical field of engine aftertreatment, in particular to a DPF state monitoring method and device and a vehicle.
Background
The performance detection of DPF (diesel particulate filter) system mainly comprises DPF overload, the existing DPF monitoring method mainly comprises the steps of judging the carbon loading of the DPF according to the differential pressure value of the upstream and downstream of the DPF by monitoring the differential pressure of the upstream and downstream of the DPF, and when the differential pressure sensor measures abnormality, the carbon loading of the DPF of the vehicle is misreported, and the running of the vehicle and the driving feeling of a user are affected.
Disclosure of Invention
The invention aims to provide a DPF state monitoring method, a DPF state monitoring device and a vehicle, which avoid deviation of DPF carbon load judgment caused by measurement deviation of a differential pressure sensor.
To achieve the purpose, the invention adopts the following technical scheme:
a DPF condition monitoring method, comprising:
pre-storing an upstream and downstream voltage difference calibration value of the DPF and a DPF idle pressure difference MAP, wherein the DPF idle pressure difference MAP comprises a corresponding relation between the upstream and downstream idle pressure difference calibration value of the DPF and the carbon loading of the DPF;
monitoring DPF upstream and downstream pressure difference and DPF carbon load, and recording the DPF upstream and downstream pressure difference monitoring value when the current driving cycle vehicle is electrified, the DPF upstream and downstream idle speed pressure difference monitoring value when the vehicle is in idle speed operation and the DPF carbon load monitoring value when the vehicle is in idle speed operation;
monitoring the current driving cycle state of the DPF comprises the following steps:
inquiring DPF idle differential pressure MAP according to a DPF carbon load monitoring value during idle running of the vehicle to determine a corresponding DPF upstream and downstream idle differential pressure calibration value;
calculating DPF differential pressure correction of the current driving cycle according to the DPF upstream and downstream differential pressure calibration value, the DPF upstream and downstream differential pressure monitoring value, the corresponding DPF upstream and downstream idle differential pressure calibration value, the DPF upstream and downstream idle differential pressure monitoring value, the DPF upstream differential pressure correction coefficient and the DPF idle differential pressure correction coefficient;
correcting the DPF upstream and downstream differential pressure monitoring value according to the DPF differential pressure correction amount of the current driving cycle to obtain a DPF first diagnosis differential pressure;
and judging the carbon loading of the DPF according to the first diagnosis differential pressure of the DPF.
Preferably, calculating the DPF differential pressure correction amount from the DPF upstream-downstream upstream differential pressure calibration value, the DPF upstream-downstream upstream differential pressure monitoring value, the corresponding DPF upstream-downstream idle differential pressure calibration value, the DPF upstream-downstream idle differential pressure monitoring value, the DPF upstream-downstream differential pressure correction coefficient, and the DPF idle differential pressure correction coefficient includes:
calculating DPF differential pressure correction according to a DPF differential pressure correction formula;
the DPF differential pressure correction formula is:
P correction amount ＝K 1 (P Power-on measurement -P Power-on sign )+K 2 (P Quick test for idle -P Idle speed sign )；
Wherein P is Correction amount For DPF differential pressure correction, K 1 For the correction factor of the voltage difference on DPF, P Power-on measurement For monitoring the upstream and downstream voltage difference of DPF, P Power-on sign K is the calibration value of the upstream and downstream voltage difference of DPF 2 Is DPF idle speed differential pressure correction coefficient, P Quick test for idle Is the DPF upstream and downstream idle differential pressure monitoring value, P Idle speed sign Is a calibration value corresponding to the upstream and downstream idle differential pressure of the DPF.
Preferably, correcting the DPF upstream-downstream differential pressure monitor value according to the DPF differential pressure correction amount to obtain the DPF first diagnostic differential pressure includes:
calculating a DPF first diagnostic differential pressure according to a DPF first diagnostic differential pressure formula;
the DPF first diagnostic differential pressure formula is:
P diagnostic differential pressure ＝P Measurement value -P Correction amount ；
Wherein P is Diagnostic differential pressure For DPF corrected diagnostic differential pressure, P Measurement value Is the DPF upstream and downstream differential pressure monitoring value.
Preferably, the determining of the DPF carbon loading based on the DPF first diagnostic differential pressure includes:
and if the DPF first diagnosis differential pressure is larger than the preset differential pressure limit value, judging that the DPF carbon loading is overloaded.
Preferably, the method further comprises:
monitoring DPF upstream temperature, setting air inflow, actual air inflow, exhaust flow and post-treatment related sensor states;
monitoring the current driving cycle status of the DPF further includes:
if the upstream temperature, the exhaust flow and the state of the post-treatment related sensor of the DPF meet the enabling conditions, the flow resistance change rate of the DPF is monitored, and if the flow resistance change rate of the DPF is larger than the set change rate and the difference value between the set air inflow and the actual air inflow is smaller than the set deviation value, the monitoring value of the upstream and downstream differential pressure of the DPF is corrected according to the set air inflow, the actual air inflow and the exhaust flow to obtain a second differential pressure of the DPF, and the carbon capacity of the DPF is judged according to the second differential pressure of the DPF.
Preferably, the enabling conditions include: the upstream temperature of the DPF is located in a preset temperature interval, the exhaust flow is located in a preset flow interval, and the post-treatment related sensor is normal.
Preferably, monitoring the DPF flow resistance change rate includes:
calculating the DPF flow resistance change rate according to the DPF flow resistance change rate formula;
the DPF flow resistance change rate formula is:
wherein,at t 1 DPF flow resistance change rate at time,/->At t 1 Time DPF upstream and downstream differential pressure measurement value, +.>At t 2 Time DPF upstream and downstream differential pressure measurement value, +.>At t 2 Exhaust flow at all times,/->At t 1 Exhaust flow at the moment.
Preferably, the method further comprises:
if the absolute value of the DPF differential pressure correction amount of the continuous multiple driving cycles is larger than a preset value, the DPF differential pressure sensor is judged to be faulty.
A DPF condition monitoring device for monitoring a carbon loading of a DPF using the DPF condition monitoring method according to any one of the above.
A vehicle that monitors the carbon loading of a DPF using the DPF condition monitoring method of any one of the above.
The invention has the beneficial effects that:
according to the DPF state monitoring method provided by the invention, the DPF upstream and downstream upstream voltage difference monitoring value when the current driving cycle vehicle is electrified and the DPF upstream and downstream idle voltage difference monitoring value when the vehicle is in idle running are obtained, and the DPF differential correction is calculated according to the DPF upstream and downstream upstream voltage difference calibration value, the DPF upstream and downstream idle voltage difference monitoring value, the DPF upstream voltage difference correction coefficient and the DPF idle voltage difference correction coefficient, and the DPF upstream and downstream voltage difference monitoring value is corrected according to the DPF differential correction to obtain the DPF first diagnosis differential pressure, so that the DPF carbon load judgment is carried out according to the DPF first diagnosis differential pressure, and the deviation of the DPF carbon load judgment caused by the measurement deviation of the differential pressure sensor is avoided.
Drawings
Fig. 1 is a flowchart of a DPF status monitoring method according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1, the present embodiment provides a DPF status monitoring method, including:
pre-storing an upstream and downstream differential pressure calibration value of a DPF and a DPF idle differential pressure MAP, wherein the DPF idle differential pressure MAP comprises a corresponding relation between the upstream and downstream differential pressure calibration value of the DPF and the carbon loading amount of the DPF, the DPF idle differential pressure MAP is obtained through experiments, the upstream and downstream differential pressure calibration value of the DPF is the differential pressure of the upstream and downstream of the DPF measured by a differential pressure sensor when a vehicle runs at idle speed under each carbon loading amount when the differential pressure sensor is free from faults, and the upstream and downstream differential pressure calibration value of the DPF can be selected from the upstream differential pressure when the differential pressure sensor of the DPF is developed and designed, and can also be selected from the average value of the upstream differential pressure measured by sampling the differential pressure sensor in the same batch as the differential pressure sensor of the DPF used on the vehicle;
monitoring DPF upstream and downstream pressure difference and DPF carbon load, and recording the DPF upstream and downstream upstream pressure difference monitoring value when the vehicle is electrified in the current driving cycle, the DPF upstream and downstream idle pressure difference monitoring value when the vehicle is in idle running and the DPF carbon load monitoring value when the vehicle is in idle running, wherein the vehicle is electrified, namely when the vehicle is started;
monitoring the current driving cycle state of the DPF comprises the following steps:
inquiring DPF idle differential pressure MAP according to a DPF carbon load monitoring value during idle running of the vehicle to determine a corresponding DPF upstream and downstream idle differential pressure calibration value;
the DPF is subjected to state monitoring according to the DPF upstream and downstream upstream voltage difference calibration value, the DPF upstream and downstream upstream voltage difference monitoring value, the corresponding DPF upstream and downstream idle speed voltage difference calibration value and the DPF upstream and downstream idle speed voltage difference monitoring value;
calculating DPF differential pressure correction of the current driving cycle according to the DPF upstream and downstream differential pressure calibration value, the DPF upstream and downstream differential pressure monitoring value, the corresponding DPF upstream and downstream idle differential pressure calibration value, the DPF upstream and downstream idle differential pressure monitoring value, the DPF upstream differential pressure correction coefficient and the DPF idle differential pressure correction coefficient;
correcting the DPF upstream and downstream differential pressure monitoring value according to the DPF differential pressure correction amount of the current driving cycle to obtain a DPF first diagnosis differential pressure;
and judging the carbon loading of the DPF according to the first diagnosis differential pressure of the DPF.
According to the DPF state monitoring method, the DPF upstream and downstream upstream voltage difference monitoring value when the current driving cycle vehicle is electrified and the DPF upstream and downstream idle voltage difference monitoring value when the vehicle is in idle operation are obtained, the DPF differential pressure correction is calculated according to the DPF upstream and downstream upstream voltage difference calibration value, the DPF upstream and downstream upstream voltage difference monitoring value, the corresponding DPF upstream and downstream idle voltage difference calibration value, the DPF upstream and downstream idle voltage difference monitoring value, the DPF upstream voltage difference correction coefficient and the DPF idle voltage difference correction coefficient, the DPF upstream and downstream voltage difference monitoring value is corrected according to the DPF differential pressure correction to obtain a DPF first diagnosis differential pressure, and the DPF carbon load is judged according to the DPF first diagnosis differential pressure, so that deviation of DPF carbon load judgment caused by measurement deviation of a differential pressure sensor is avoided.
Optionally, calculating the DPF differential pressure correction amount according to the DPF upstream-downstream upstream differential pressure calibration value, the DPF upstream-downstream upstream differential pressure monitoring value, the corresponding DPF upstream-downstream idle differential pressure calibration value, the DPF upstream-downstream idle differential pressure monitoring value, the DPF upstream-downstream differential pressure correction coefficient, and the DPF idle differential pressure correction coefficient includes:
calculating DPF differential pressure correction according to a DPF differential pressure correction formula;
the DPF differential pressure correction formula is:
P correction amount ＝K 1 (P Power-on measurement -P Power-on sign )+K 2 (P Quick test for idle -P Idle speed sign )；
Wherein P is Correction amount For DPF differential pressure correction, K 1 For the correction factor of the voltage difference on DPF, P Power-on measurement For monitoring the upstream and downstream voltage difference of DPF, P Power-on sign K is the calibration value of the upstream and downstream voltage difference of DPF 2 Is DPF idle speed differential pressure correction coefficient, P Quick test for idle Is the DPF upstream and downstream idle differential pressure monitoring value, P Idle speed sign Is a calibration value corresponding to the upstream and downstream idle differential pressure of the DPF. Preferably, the upstream and downstream voltage differences of the DPF of the vehicle are used as the first priority, and the upstream and downstream idle voltage differences of the DPF are used as the second priority, namely K 1 The setting is larger, K 2 The setting is small, K in this embodiment 1 Take 0.7, K 2 Taking 0.3.
Optionally, correcting the DPF upstream-downstream differential pressure monitoring value according to the DPF differential pressure correction amount to obtain the DPF first diagnostic differential pressure includes:
calculating a DPF first diagnostic differential pressure according to a DPF first diagnostic differential pressure formula;
the DPF first diagnostic differential pressure formula is:
P diagnostic differential pressure ＝P Measurement value -P Correction amount ；
Wherein P is Diagnostic differential pressure For DPF corrected diagnostic differential pressure, P Measurement value Is the DPF upstream and downstream differential pressure monitoring value.
Optionally, determining the DPF carbon loading based on the DPF first diagnostic differential pressure includes:
if the DPF first diagnosis differential pressure is larger than a preset differential pressure limit value, judging that the DPF carbon loading is overloaded;
and if the DPF first diagnosis differential pressure is not larger than the preset differential pressure limit value, judging that the carbon loading of the DPF is normal.
Optionally, as shown in fig. 1, the DPF status monitoring method provided in this embodiment further includes:
monitoring the upstream temperature of the DPF, the set air inflow, the actual air inflow, the exhaust flow and the post-treatment related sensor states, wherein the related sensor states refer to states of a temperature sensor and a flow sensor in a post-treatment system, the states of the sensors can be obtained by inquiring an OBD system on a vehicle, the OBD system is a fault diagnosis system mounted on the vehicle, the system can monitor the states of the temperature sensor and the flow sensor in the treatment system in real time, the set air inflow is obtained by inquiring a set air inflow according to the engine speed and the fuel injection quantity, the set air inflow MAP comprises the corresponding relation between the engine speed, the fuel injection quantity and the set air inflow, and the set air inflow MAP is obtained through a bench experiment and is prestored in a vehicle control system; monitoring the current driving cycle status of the DPF further includes: if the upstream temperature, the exhaust flow and the state of the post-treatment related sensor of the DPF meet the enabling conditions, monitoring the flow resistance change rate of the DPF, and if the flow resistance change rate of the DPF is larger than the set change rate and the difference value between the set air inflow and the actual air inflow is smaller than the set deviation value, correcting the upstream and downstream differential pressure monitoring value of the DPF according to the set air inflow, the actual air inflow and the exhaust flow to obtain a DPF second diagnosis differential pressure, and judging the carbon capacity of the DPF according to the DPF second diagnosis differential pressure; if the DPF flow resistance change rate is larger than the set change rate and the difference value between the set air inflow and the actual air inflow is not smaller than the set deviation value, judging that the DPF differential pressure sensor is faulty, and reporting a fault alarm of the DPF differential pressure sensor. Under normal conditions, the flow resistance should be at a relatively stable value, when the vehicle air intake system leaks air or the differential pressure sensor is abnormal, the flow resistance is possibly suddenly changed, when the DPF flow resistance change rate is larger than the set change rate and the difference between the set air inflow and the actual air inflow is smaller than the set deviation value, the condition that the vehicle air intake system is not abnormal is indicated, the DPF flow resistance change rate is larger than the set change rate and the difference between the set air inflow and the actual air inflow is not smaller than the set deviation value is indicated, the condition that the DPF flow resistance change rate is larger than the set change rate is indicated, the vehicle air intake system leaks air and other faults are caused, the air inflow is reduced, the DPF upstream and downstream differential pressure measured by the DPF differential pressure sensor is reduced, and the DPF upstream and downstream differential pressure measured value cannot reflect the DPF actual carbon loading, so that the DPF upstream and downstream differential pressure monitored value needs to be corrected. Specifically, correcting the DPF upstream-downstream differential pressure monitoring value according to the set air inflow, the actual air inflow and the exhaust flow to obtain a DPF second diagnostic differential pressure comprises: calculating the difference between the set air inflow and the actual air inflow to obtain an air inflow deviation value, wherein the air inflow deviation value is equal to an exhaust flow deviation value, so that the corrected exhaust quantity is equal to the sum of the exhaust flow and the air inflow deviation value, inquiring the DPF exhaust flow MAP according to the calculated corrected exhaust quantity and the current carbon load monitoring value to determine a DPF second diagnosis differential pressure, wherein the DPF exhaust flow MAP comprises the corresponding relation of the exhaust flow, the carbon load and the DPF second diagnosis differential pressure, and the DPF exhaust flow MAP is obtained through bench experiments and pre-stored in a vehicle control system.
Optionally, determining the DPF carbon loading based on the DPF second diagnostic differential pressure includes: and if the DPF second diagnosis differential pressure is larger than the preset differential pressure limit value, judging that the DPF carbon loading is overloaded, and if the DPF second diagnosis differential pressure is not larger than the preset differential pressure limit value, judging that the DPF carbon loading is normal.
Optionally, the enabling conditions include: the upstream temperature of the DPF is located in a preset temperature interval, the exhaust flow is located in a preset flow interval, and the post-treatment related sensor is normal.
Optionally, monitoring the DPF flow resistance change rate includes:
calculating the DPF flow resistance change rate according to the DPF flow resistance change rate formula;
the DPF flow resistance change rate formula is:
wherein,at t 1 Time-of-day DPF flow resistance variationRate of->At t 1 Time DPF upstream and downstream differential pressure measurement value, +.>At t 2 Time DPF upstream and downstream differential pressure measurement value, +.>At t 2 Exhaust flow at all times,/->At t 1 Exhaust flow at the moment. In the present embodiment t 2 And t 1 At 1 second intervals, i.e. t 2 -t 1 The value of (2) is 1 second.
Status monitoring of the DPF further includes:
optionally, the DPF state monitoring method provided in this embodiment further includes: if the absolute value of the DPF differential pressure correction amount of a plurality of continuous driving cycles is larger than a preset value, the fault of the DPF differential pressure sensor is judged, and a fault alarm of the DPF differential pressure sensor is reported. The absolute value of the DPF differential pressure correction amount of a plurality of continuous driving cycles is larger than a preset value, so that the DPF differential pressure sensor is indicated to have irreversible measurement deviation, and the vehicle sends out an alarm prompt at the moment to remind a vehicle owner to repair or replace the differential pressure sensor.
A DPF condition monitoring device monitors a carbon loading amount of a DPF by using the above-described DPF condition monitoring method.
A vehicle monitors the carbon loading of a DPF by using the DPF state monitoring method.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A DPF condition monitoring method, comprising:
pre-storing an upstream and downstream voltage difference calibration value of the DPF and a DPF idle pressure difference MAP, wherein the DPF idle pressure difference MAP comprises a corresponding relation between the upstream and downstream idle pressure difference calibration value of the DPF and the carbon loading of the DPF;
monitoring DPF upstream and downstream pressure difference and DPF carbon load, and recording the DPF upstream and downstream pressure difference monitoring value when the current driving cycle vehicle is electrified, the DPF upstream and downstream idle speed pressure difference monitoring value when the vehicle is in idle speed operation and the DPF carbon load monitoring value when the vehicle is in idle speed operation;
monitoring the current driving cycle state of the DPF comprises the following steps:
inquiring DPF idle differential pressure MAP according to a DPF carbon load monitoring value during idle running of the vehicle to determine a corresponding DPF upstream and downstream idle differential pressure calibration value;
calculating DPF differential pressure correction of the current driving cycle according to the DPF upstream and downstream differential pressure calibration value, the DPF upstream and downstream differential pressure monitoring value, the corresponding DPF upstream and downstream idle differential pressure calibration value, the DPF upstream and downstream idle differential pressure monitoring value, the DPF upstream differential pressure correction coefficient and the DPF idle differential pressure correction coefficient;
correcting the DPF upstream and downstream differential pressure monitoring value according to the DPF differential pressure correction amount of the current driving cycle to obtain a DPF first diagnosis differential pressure;
and judging the carbon loading of the DPF according to the first diagnosis differential pressure of the DPF.
2. The DPF condition monitoring method according to claim 1, wherein calculating the DPF differential pressure correction amount based on the DPF upstream-downstream upstream differential pressure calibration value, the DPF upstream-downstream upstream differential pressure monitoring value, the corresponding DPF upstream-downstream idle differential pressure calibration value, the DPF upstream-downstream idle differential pressure monitoring value, the DPF upstream differential pressure correction coefficient, and the DPF idle differential pressure correction coefficient includes:
calculating DPF differential pressure correction according to a DPF differential pressure correction formula;
the DPF differential pressure correction formula is:
P correction amount ＝K 1 (P Power-on measurement -P Power-on sign )+K 2 (P Quick test for idle -P Idle speed sign )；
Wherein P is Correction amount For DPF differential pressure correction, K 1 For the correction factor of the voltage difference on DPF, P Power-on measurement For monitoring the upstream and downstream voltage difference of DPF, P Power-on sign K is the calibration value of the upstream and downstream voltage difference of DPF 2 Is DPF idle speed differential pressure correction coefficient, P Quick test for idle Is the DPF upstream and downstream idle differential pressure monitoring value, P Idle speed sign Is a calibration value corresponding to the upstream and downstream idle differential pressure of the DPF.
3. The DPF condition monitoring method according to claim 2, wherein correcting the DPF upstream-downstream differential pressure monitor value according to the DPF differential pressure correction amount to obtain the DPF first diagnostic differential pressure includes:
calculating a DPF first diagnostic differential pressure according to a DPF first diagnostic differential pressure formula;
the DPF first diagnostic differential pressure formula is:
P diagnostic differential pressure ＝P Measurement value -P Correction amount ；
Wherein P is Diagnostic differential pressure For DPF corrected diagnostic differential pressure, P Measurement value Is the DPF upstream and downstream differential pressure monitoring value.
4. The DPF condition monitoring method according to claim 3, wherein the determining of the DPF carbon loading based on the DPF first diagnostic pressure difference includes:
and if the DPF first diagnosis differential pressure is larger than the preset differential pressure limit value, judging that the DPF carbon loading is overloaded.
5. The DPF condition monitoring method according to claim 1, further comprising:
monitoring DPF upstream temperature, setting air inflow, actual air inflow, exhaust flow and post-treatment related sensor states;
monitoring the current driving cycle status of the DPF further includes:
if the upstream temperature, the exhaust flow and the state of the post-treatment related sensor of the DPF meet the enabling conditions, the flow resistance change rate of the DPF is monitored, and if the flow resistance change rate of the DPF is larger than the set change rate and the difference value between the set air inflow and the actual air inflow is smaller than the set deviation value, the monitoring value of the upstream and downstream differential pressure of the DPF is corrected according to the set air inflow, the actual air inflow and the exhaust flow to obtain a second differential pressure of the DPF, and the carbon capacity of the DPF is judged according to the second differential pressure of the DPF.
6. The DPF condition monitoring method according to claim 5, wherein the enabling conditions include: the upstream temperature of the DPF is located in a preset temperature interval, the exhaust flow is located in a preset flow interval, and the post-treatment related sensor is normal.
7. The DPF condition monitoring method according to claim 5, wherein monitoring the rate of change of the flow resistance of the DPF comprises:
calculating the DPF flow resistance change rate according to the DPF flow resistance change rate formula;
the DPF flow resistance change rate formula is:
wherein,at t 1 DPF flow resistance change rate at time,/->At t 1 Time DPF upstream and downstream differential pressure measurement value, +.>At t 2 Time DPF upstream and downstream differential pressure measurement value, +.>At t 2 Exhaust flow at all times,/->At t 1 Exhaust flow at the moment.
8. The DPF condition monitoring method according to claim 1, further comprising:
if the absolute value of the DPF differential pressure correction amount of the continuous multiple driving cycles is larger than a preset value, the DPF differential pressure sensor is judged to be faulty.
9. A DPF condition monitoring device characterized in that a carbon loading is monitored for a DPF using the DPF condition monitoring method according to any one of claims 1 to 8.
10. A vehicle characterized in that the DPF is monitored for carbon loading using the DPF condition monitoring method according to any one of claims 1 to 8.
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| CN202210886653.9A CN115013131B (en) | 2022-07-26 | 2022-07-26 | DPF state monitoring method and device and vehicle |
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| CN116086809B (en) * | 2023-04-10 | 2023-07-18 | 潍柴动力股份有限公司 | Engine monitoring method and device |
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