CN114017170A - double-DPF upstream temperature sensor credibility monitoring method and device and engine - Google Patents

double-DPF upstream temperature sensor credibility monitoring method and device and engine Download PDF

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Publication number
CN114017170A
CN114017170A CN202210004600.XA CN202210004600A CN114017170A CN 114017170 A CN114017170 A CN 114017170A CN 202210004600 A CN202210004600 A CN 202210004600A CN 114017170 A CN114017170 A CN 114017170A
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dpf
upstream temperature
value
temperature sensor
upstream
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CN202210004600.XA
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CN114017170B (en
Inventor
孙文强
李钊
安存国
秦海玉
王国栋
褚国良
梁健星
郭圣刚
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • 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
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The invention discloses a double-DPF upstream temperature sensor credibility monitoring method, a device and an engine, which are applied to an engine post-treatment system comprising double DPFs, wherein upstream temperature sensors are respectively arranged at the upstream of each DPF, and the method comprises the following steps: if the preset monitoring release condition is met, acquiring the measured value of the upstream temperature sensor of each DPF; if the absolute value of the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value, and the absolute value of the difference value between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value, whether the upstream temperature sensor of the current DPF has credibility faults or not is determined according to the measured value of the upstream temperature sensor of each DPF, and the credibility monitoring accuracy of the upstream temperature sensors of the double DPFs is improved by mutually verifying the upstream temperature sensors of the two DPFs.

Description

double-DPF upstream temperature sensor credibility monitoring method and device and engine
Technical Field
The application relates to the technical field of automobile control, in particular to a method and a device for monitoring credibility of a double DPF upstream temperature sensor and an engine.
Background
In diesel aftertreatment systems, it is desirable to utilize DPFs to reduce engine particulate emissions. One DOC (Diesel Oxidation catalyst) + DPF (Diesel particulate filter) is added in the aftertreatment, and two DOCs and two DPFs are arranged in parallel. The DPF upstream temperature sensor is added, so that the exhaust back pressure of the engine can be reduced, the thermal efficiency of the engine is improved, the oil consumption is saved, and the use cost is reduced.
When the carbon loading reaches a certain limit value, DPF regeneration is needed, and the temperature control during regeneration is to perform closed-loop control by taking the measured value of the DPF upstream temperature sensor as a feedback value. However, the prior art is not accurate in monitoring the credibility of the dual DPF upstream temperature sensor.
Therefore, how to improve the accuracy of credibility monitoring of the dual DPF upstream temperature sensor is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a method for monitoring credibility of double DPF (diesel particulate filter) upstream temperature sensors, which is used for solving the technical problem of low accuracy in monitoring credibility of the double DPF upstream temperature sensors in the prior art.
The method is applied to an engine aftertreatment system comprising double DPFs, wherein an upstream temperature sensor is respectively arranged at the upstream of each DPF, and the method comprises the following steps:
if the preset monitoring release condition is met, acquiring the measured value of the upstream temperature sensor of each DPF;
if the absolute value of the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value, and the absolute value of the difference value between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value, determining whether the upstream temperature sensor of the current DPF has credibility faults or not according to the measured value of the upstream temperature sensor of each DPF;
wherein the DPF upstream temperature model value is calculated based on a DPF temperature model.
In some embodiments of the present application, it is determined whether there is a plausibility failure in the upstream temperature sensor of the current DPF based on the measured value of the upstream temperature sensor of each DPF, specifically:
determining the difference value of the measured values of the upstream temperature sensors of the DPF, and judging whether the absolute value of the difference value of the measured values of the upstream temperature sensors of the DPF is larger than a second limit value or not;
if yes, determining that the upstream temperature sensor of the current DPF has credibility faults;
if not, determining that the upstream temperature sensor of the current DPF has no credibility fault.
In some embodiments of the present application, after determining that there is a plausibility failure of the temperature sensor upstream of the current DPF, the method further comprises:
and sending alarm information that the upstream temperature sensor of the current DPF has credibility faults.
In some embodiments of the present application, after obtaining measurements of the upstream temperature sensor of each DPF, the method further comprises:
calculating a DPF upstream temperature model value based on the DPF temperature model;
determining the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF, and filtering;
the difference between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is determined and filtered.
In some embodiments of the present application, the predetermined monitoring release condition is one or more conditions including ambient pressure within a predetermined pressure range, ambient temperature within a predetermined temperature range, fuel level greater than a level limit, exhaust gas mass flow exceeding a predetermined flow limit, engine mode not in regeneration mode, no occurrence of a predetermined fault.
Correspondingly, the invention also provides a double-DPF upstream temperature sensor credibility monitoring device, which is applied to an engine aftertreatment system comprising double DPFs, wherein upstream temperature sensors are respectively arranged at the upstream of each DPF, and the device comprises:
the acquisition module is used for acquiring the measured value of the upstream temperature sensor of each DPF if a preset monitoring release condition is met;
the determining module is used for determining whether the upstream temperature sensor of the current DPF has credibility faults or not according to the measured value of the upstream temperature sensor of each DPF if the absolute value of the difference value of the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value and the absolute value of the difference value of the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value;
wherein the DPF upstream temperature model value is calculated based on a DPF temperature model.
In some embodiments of the present application, the determining module is specifically configured to:
determining the difference value of the measured values of the upstream temperature sensors of the DPF, and judging whether the absolute value of the difference value of the measured values of the upstream temperature sensors of the DPF is larger than a second limit value or not;
if yes, determining that the upstream temperature sensor of the current DPF has credibility faults;
if not, determining that the upstream temperature sensor of the current DPF has no credibility fault.
In some embodiments of the present application, the apparatus further comprises an alarm module configured to:
and sending alarm information that the upstream temperature sensor of the current DPF has credibility faults.
In some embodiments of the present application, the apparatus further comprises a filtering module configured to:
calculating a DPF upstream temperature model value based on the DPF temperature model;
determining the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF, and filtering;
the difference between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is determined and filtered.
Correspondingly, the invention also provides an engine comprising the double DPF upstream temperature sensor credibility monitoring device.
By applying the technical scheme, in the engine post-treatment system comprising the double DPF, the upstream temperature sensors are respectively arranged at the upstream of each DPF, and if the preset monitoring release condition is met, the measured value of the upstream temperature sensor of each DPF is obtained; if the absolute value of the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value, and the absolute value of the difference value between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value, whether the upstream temperature sensor of the current DPF has credibility faults or not is determined according to the measured value of the upstream temperature sensor of each DPF, and the credibility monitoring accuracy of the upstream temperature sensors of the double DPFs is improved by mutually verifying the upstream temperature sensors of the two DPFs.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for monitoring the credibility of dual DPF upstream temperature sensors according to an embodiment of the present invention;
FIG. 2 shows an engine aftertreatment system layout according to an embodiment of the invention;
FIG. 3 is a schematic flow chart illustrating a method for monitoring the plausibility of a dual DPF upstream temperature sensor according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating a device for monitoring the plausibility of a dual DPF upstream temperature sensor according to an embodiment of the present invention.
In FIG. 2, 10, NOXA sensor; 20. HC injection; 30. a temperature sensor; 40. a differential pressure sensor; 50. urea injection; 60. a PM sensor.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a method for monitoring credibility of double DPF upstream temperature sensors, which judges by means of mutual verification of the two DPF upstream temperature sensors, and realizes accurate monitoring of credibility of the double DPF upstream temperature sensors.
The method is applied to an engine aftertreatment system comprising double DPFs, wherein an upstream temperature sensor is respectively arranged upstream of each DPF, and as shown in FIG. 1, the method comprises the following steps:
and step S101, judging whether a preset monitoring release condition is met. If yes, go to step S102, otherwise go to step S101.
In this embodiment, the engine aftertreatment system with two DPFs includes two DOC + DPFs arranged in parallel, and an upstream temperature sensor is disposed upstream of each DPF.
Because the measured values of the DPF upstream temperature sensors have different change conditions under different conditions, in order to improve the monitoring accuracy, the credibility monitoring of the double DPF upstream temperature sensors is triggered when the preset monitoring release condition is met, and therefore whether the preset monitoring release condition is met or not is judged at first.
To improve the monitoring accuracy, in some embodiments of the present application, the predetermined monitoring release condition is one or more conditions including ambient pressure within a predetermined pressure range, ambient temperature within a predetermined temperature range, fuel level greater than a level limit, exhaust mass flow exceeding a predetermined flow limit, engine mode not in regeneration mode, no predetermined fault occurring.
It should be noted that, those skilled in the art may select other monitoring release conditions according to actual needs, which does not affect the scope of the present application.
In step S102, the measurement value of the upstream temperature sensor of each DPF is acquired.
In the present embodiment, the measurement value of the upstream temperature sensor of each DPF can be acquired based on an ECU (Electronic Control Unit).
Step S103, judging whether the absolute value of the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value, and the absolute value of the difference value between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value. If yes, go to step S104, otherwise go to step S103.
In this embodiment, the DPF upstream temperature model value is calculated based on the DPF temperature model, and if the absolute value of the difference between the measurement value of the upstream temperature sensor of the current DPF and the DPF upstream temperature model value is greater than a first limit value, and the absolute value of the difference between the measurement value of the upstream temperature sensor of the other DPF and the DPF upstream temperature model value is not greater than the first limit value (that is, the absolute value of the difference between the measurement value of the upstream temperature sensor of the other DPF and the DPF upstream temperature model value is within a set range), it indicates that there is a possibility of a plausibility failure in the upstream temperature sensor of the current DPF, and the upstream temperature sensor of the other DPF is normal. It is necessary to continue to perform step S104 for further confirmation.
The person skilled in the art can set the appropriate first limit value according to actual needs, which does not affect the scope of protection of the present application.
It should be noted that, a specific process for calculating a DPF upstream temperature model value based on a DPF temperature model is the prior art, and is not described herein again.
Step S104, determining whether the upstream temperature sensor of the current DPF has credibility fault according to the measured value of the upstream temperature sensor of each DPF.
In order to improve the monitoring accuracy, in some embodiments of the present application, it is determined whether there is a plausibility failure in the upstream temperature sensor of the current DPF based on the measurement value of the upstream temperature sensor of each DPF, specifically:
determining the difference value of the measured values of the upstream temperature sensors of the DPF, and judging whether the absolute value of the difference value of the measured values of the upstream temperature sensors of the DPF is larger than a second limit value or not;
if yes, determining that the upstream temperature sensor of the current DPF has credibility faults;
if not, determining that the upstream temperature sensor of the current DPF has no credibility fault.
In this embodiment, the difference between the measured values of the upstream temperature sensors of the DPFs is determined, then, the determination is performed according to the absolute value of the difference, and if the absolute value of the difference is greater than the second limit value, it is determined that the deviation between the measured value of the current upstream temperature sensor and the measured value of the upstream temperature sensor of another normal DPF is large, and it is determined that the reliability fault exists in the current upstream temperature sensor of the DPF; otherwise, determining that the upstream temperature sensor of the current DPF has no credibility fault.
The person skilled in the art can set the appropriate second limit value according to actual needs, which does not affect the scope of protection of the present application.
It should be noted that the above embodiment is only one specific implementation proposed in the present application, and other ways of determining whether there is a credibility failure in the upstream temperature sensor of the current DPF according to the measurement value of the upstream temperature sensor of each DPF belong to the protection scope of the present application.
In order to facilitate a user to timely determine that there is a plausibility failure in the upstream temperature sensor of the current DPF, in some embodiments of the present application, after determining that there is a plausibility failure in the upstream temperature sensor of the current DPF, the method further comprises:
and sending alarm information that the upstream temperature sensor of the current DPF has credibility faults.
In the embodiment, the alarm information of credible faults of the upstream temperature sensor of the current DPF is sent, so that a user can timely determine the state of the upstream temperature sensor of the current DPF and carry out corresponding processing, and the alarm information can be image-text prompt and/or sound prompt.
To further improve the monitoring accuracy, in some embodiments of the present application, after obtaining measurements of the upstream temperature sensor of each DPF, the method further comprises:
calculating a DPF upstream temperature model value based on the DPF temperature model;
determining the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF, and filtering;
the difference between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is determined and filtered.
In this embodiment, an upstream temperature model value of the DPF is calculated based on the DPF temperature model, a difference between a measurement value of the upstream temperature sensor of each DPF and the upstream temperature model value of the DPF is determined, and each difference is filtered to compare the filtered difference with a first limit value.
It should be noted that, the specific process of filtering each difference value is the prior art, and is not described herein again.
By applying the technical scheme, in the engine post-treatment system comprising the double DPF, the upstream temperature sensors are respectively arranged at the upstream of each DPF, and if the preset monitoring release condition is met, the measured value of the upstream temperature sensor of each DPF is obtained; if the absolute value of the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value, and the absolute value of the difference value between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value, whether the upstream temperature sensor of the current DPF has credibility faults or not is determined according to the measured value of the upstream temperature sensor of each DPF, and the credibility monitoring accuracy of the upstream temperature sensors of the double DPFs is improved by mutually verifying the upstream temperature sensors of the two DPFs.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
Referring to fig. 2, which is a layout diagram of an engine aftertreatment system according to an embodiment of the invention, exhaust gas after TC (turbo charger) is discharged after HC injection 20, two DOC + DPF, urea injection 50, two SCR + ASC (Ammonia Slip Catalyst, Ammonia oxidation Catalyst). A temperature sensor 30 is provided upstream of each DPF, and NO is provided in an exhaust pipe upstream of the DOCXA sensor 10 and a temperature sensor 30, a differential pressure sensor 40 is provided in each DPF, the temperature sensor 30 is provided in the exhaust line upstream of the SCR, and NO is provided in the exhaust line downstream of the ASCXSensor 10, temperature sensor 30, and PM sensor 60.
The embodiment of the application provides a method for monitoring credibility of a double DPF upstream temperature sensor, as shown in FIG. 3, comprising the following steps:
step S201 starts.
Step S202, satisfying the preset monitoring release condition, if yes, executing step S203, otherwise, continuing to execute step S202.
The preset monitoring release conditions are as follows: (the following conditions may be selectively released)
1. The environmental pressure is within a preset pressure range;
2. the ambient temperature is within a preset temperature range;
3. the liquid level of the fuel oil is greater than the liquid level limit value;
4. the mass flow of the waste gas exceeds a preset flow limit value;
5. the engine mode is not in the regeneration mode;
6. no associated failure occurred.
Step S203, whether the absolute value of the difference between the measured value T51 of the DPF (1) upstream temperature sensor and the DPF upstream temperature model value exceeds the limit value 1 or not and whether the absolute value of the difference between the measured value T52 of the DPF (2) upstream temperature sensor and the DPF upstream temperature model value does not exceed the limit value 1 or not is judged. If yes, go to step S204, otherwise go to step S203.
In the step, the difference value between the measured value T51 of the DPF (1) upstream temperature sensor and the DPF upstream temperature model value and the difference value between the measured value T52 of the DPF (2) upstream temperature sensor and the DPF upstream temperature model value are filtered difference values.
And step S204, triggering mutual verification judgment of the two DPF upstream temperature sensors.
In step S205, the absolute value of the difference between the measured values of the two DPF upstream temperature sensors exceeds the limit 2. If yes, go to step S206, otherwise go to step S207.
And step S206, reporting the credibility fault of the temperature sensor at the upstream of the DPF (1).
And step S207, ending.
The embodiment of the present application further provides a device for monitoring credibility of dual DPF upstream temperature sensors, which is applied to an engine aftertreatment system including dual DPFs, wherein upstream temperature sensors are respectively disposed upstream of each DPF, as shown in fig. 4, the device includes:
an obtaining module 401, configured to obtain a measurement value of an upstream temperature sensor of each DPF if a preset monitoring release condition is met;
a determining module 402, configured to determine whether there is a plausibility failure in the upstream temperature sensor of the current DPF according to the measured value of the upstream temperature sensor of each DPF if the absolute value of the difference between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is greater than a first limit value and the absolute value of the difference between the measured value of the upstream temperature sensor of another DPF and the model value of the upstream temperature of the DPF is not greater than the first limit value;
wherein the DPF upstream temperature model value is calculated based on a DPF temperature model.
In a specific application scenario of the present application, the determining module 402 is specifically configured to:
determining the difference value of the measured values of the upstream temperature sensors of the DPF, and judging whether the absolute value of the difference value of the measured values of the upstream temperature sensors of the DPF is larger than a second limit value or not;
if yes, determining that the upstream temperature sensor of the current DPF has credibility faults;
if not, determining that the upstream temperature sensor of the current DPF has no credibility fault.
In a specific application scenario of the present application, the apparatus further includes an alarm module, configured to:
and sending alarm information that the upstream temperature sensor of the current DPF has credibility faults.
In a specific application scenario of the present application, the apparatus further includes a filtering module, configured to:
calculating a DPF upstream temperature model value based on the DPF temperature model;
determining the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF, and filtering;
the difference between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is determined and filtered.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A dual DPF upstream temperature sensor credibility monitoring method is applied to an engine aftertreatment system comprising dual DPFs, wherein upstream temperature sensors are respectively arranged at the upstream of each DPF, and the method comprises the following steps:
if the preset monitoring release condition is met, acquiring the measured value of the upstream temperature sensor of each DPF;
if the absolute value of the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value, and the absolute value of the difference value between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value, determining whether the upstream temperature sensor of the current DPF has credibility faults or not according to the measured value of the upstream temperature sensor of each DPF;
wherein the DPF upstream temperature model value is calculated based on a DPF temperature model.
2. The method according to claim 1, wherein determining whether there is a plausibility failure of the upstream temperature sensor of the present DPF based on the measured value of the upstream temperature sensor of each DPF is:
determining the difference value of the measured values of the upstream temperature sensors of the DPF, and judging whether the absolute value of the difference value of the measured values of the upstream temperature sensors of the DPF is larger than a second limit value or not;
if yes, determining that the upstream temperature sensor of the current DPF has credibility faults;
if not, determining that the upstream temperature sensor of the current DPF has no credibility fault.
3. The method of claim 2, wherein after determining that there is a plausibility failure of the temperature sensor upstream of the current DPF, the method further comprises:
and sending alarm information that the upstream temperature sensor of the current DPF has credibility faults.
4. The method of claim 1, wherein after obtaining measurements of the upstream temperature sensor of each DPF, the method further comprises:
calculating a DPF upstream temperature model value based on the DPF temperature model;
determining the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF, and filtering;
the difference between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is determined and filtered.
5. The method of claim 1, wherein the predetermined monitor-released condition is one or more conditions including ambient pressure within a predetermined pressure range, ambient temperature within a predetermined temperature range, fuel level greater than a level limit, exhaust mass flow exceeding a predetermined flow limit, engine mode not in regeneration mode, no predetermined fault occurring.
6. A dual DPF upstream temperature sensor reliability monitoring device, applied to an engine aftertreatment system including dual DPFs, upstream temperature sensors being provided upstream of respective DPFs, the device comprising:
the acquisition module is used for acquiring the measured value of the upstream temperature sensor of each DPF if a preset monitoring release condition is met;
the determining module is used for determining whether the upstream temperature sensor of the current DPF has credibility faults or not according to the measured value of the upstream temperature sensor of each DPF if the absolute value of the difference value of the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF is larger than a first limit value and the absolute value of the difference value of the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is not larger than the first limit value;
wherein the DPF upstream temperature model value is calculated based on a DPF temperature model.
7. The apparatus of claim 6, wherein the determination module is specifically configured to:
determining the difference value of the measured values of the upstream temperature sensors of the DPF, and judging whether the absolute value of the difference value of the measured values of the upstream temperature sensors of the DPF is larger than a second limit value or not;
if yes, determining that the upstream temperature sensor of the current DPF has credibility faults;
if not, determining that the upstream temperature sensor of the current DPF has no credibility fault.
8. The apparatus of claim 6, further comprising an alarm module to:
and sending alarm information that the upstream temperature sensor of the current DPF has credibility faults.
9. The apparatus of claim 6, wherein the apparatus further comprises a filtering module to:
calculating a DPF upstream temperature model value based on the DPF temperature model;
determining the difference value between the measured value of the upstream temperature sensor of the current DPF and the model value of the upstream temperature of the DPF, and filtering;
the difference between the measured value of the upstream temperature sensor of the other DPF and the model value of the upstream temperature of the DPF is determined and filtered.
10. An engine comprising a dual DPF upstream temperature sensor plausibility monitoring device according to any of claims 6-9.
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CN114934835A (en) * 2022-02-23 2022-08-23 上海和夏骏智科技有限公司 DPF efficiency monitoring structure and DPF efficiency monitoring method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115126583B (en) * 2022-07-18 2024-01-12 潍柴动力股份有限公司 Dual-path particle catcher fault diagnosis method and system

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120079814A1 (en) * 2009-06-11 2012-04-05 Micael Blomquist Exhaust gas recirculation system
CN204755026U (en) * 2015-05-28 2015-11-11 中国汽车技术研究中心 Gasoline engine double - circuit particulate matter filter equipment that connects in parallel
CN205036427U (en) * 2015-09-24 2016-02-17 康明斯排放处理公司 After treatment system with local filter of pottery
CN107747505A (en) * 2017-08-16 2018-03-02 江苏大学 A kind of system and control method that DPF is alternately regenerated using engine exhaust
CN110925067A (en) * 2019-12-11 2020-03-27 潍柴动力股份有限公司 Temperature sensor misloading detection method and device and engine post-processing system
CN112253295A (en) * 2020-09-23 2021-01-22 中国铁道科学研究院集团有限公司铁道建筑研究所 High-power diesel engine tail gas aftertreatment device
CN112648055A (en) * 2020-12-10 2021-04-13 潍柴动力股份有限公司 Method, device, equipment and medium for detecting reliability of nitrogen oxide sensor
CN113226513A (en) * 2018-10-24 2021-08-06 珀金埃尔默健康科学加拿大股份有限公司 Particulate filter and system including the same
US20210270178A1 (en) * 2018-08-10 2021-09-02 Bayerische Motoren Werke Aktiengesellschaft Detecting a Modification of a Particle Filter for an Exhaust Branch of a Motor Vehicle
CN113514169A (en) * 2021-08-20 2021-10-19 一汽解放汽车有限公司 Credibility fault diagnosis method for downstream temperature sensor of SCR (Selective catalytic reduction) system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120079814A1 (en) * 2009-06-11 2012-04-05 Micael Blomquist Exhaust gas recirculation system
CN204755026U (en) * 2015-05-28 2015-11-11 中国汽车技术研究中心 Gasoline engine double - circuit particulate matter filter equipment that connects in parallel
CN205036427U (en) * 2015-09-24 2016-02-17 康明斯排放处理公司 After treatment system with local filter of pottery
CN107747505A (en) * 2017-08-16 2018-03-02 江苏大学 A kind of system and control method that DPF is alternately regenerated using engine exhaust
US20210270178A1 (en) * 2018-08-10 2021-09-02 Bayerische Motoren Werke Aktiengesellschaft Detecting a Modification of a Particle Filter for an Exhaust Branch of a Motor Vehicle
CN113226513A (en) * 2018-10-24 2021-08-06 珀金埃尔默健康科学加拿大股份有限公司 Particulate filter and system including the same
CN110925067A (en) * 2019-12-11 2020-03-27 潍柴动力股份有限公司 Temperature sensor misloading detection method and device and engine post-processing system
CN112253295A (en) * 2020-09-23 2021-01-22 中国铁道科学研究院集团有限公司铁道建筑研究所 High-power diesel engine tail gas aftertreatment device
CN112648055A (en) * 2020-12-10 2021-04-13 潍柴动力股份有限公司 Method, device, equipment and medium for detecting reliability of nitrogen oxide sensor
CN113514169A (en) * 2021-08-20 2021-10-19 一汽解放汽车有限公司 Credibility fault diagnosis method for downstream temperature sensor of SCR (Selective catalytic reduction) system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114934835A (en) * 2022-02-23 2022-08-23 上海和夏骏智科技有限公司 DPF efficiency monitoring structure and DPF efficiency monitoring method

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