CN112211705B - Method, device and system for monitoring DPF removal - Google Patents
Method, device and system for monitoring DPF removal Download PDFInfo
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- CN112211705B CN112211705B CN202010948704.7A CN202010948704A CN112211705B CN 112211705 B CN112211705 B CN 112211705B CN 202010948704 A CN202010948704 A CN 202010948704A CN 112211705 B CN112211705 B CN 112211705B
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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
- 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
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/24—Determining the presence or absence of an exhaust treating device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention belongs to the technical field of vehicles, and particularly relates to a method, a device and a system for monitoring DPF removal. The method of monitoring DPF removal of the present invention comprises the steps of: acquiring a current upstream temperature value of the DPF and a current downstream temperature value of the DPF; and calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and judging that the DPF is in a removal state according to the temperature difference value not greater than a preset temperature value. In the method for monitoring the removal of the DPF, the temperature difference value is calculated according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, the DPF is judged to be in a removal state according to the condition that the temperature difference value is not larger than the preset temperature value, namely the difference between the upstream temperature value of the DPF and the downstream temperature value of the DPF is not large, and the DPF removal state is judged according to the temperature value, so that the deviation of the measured value can be reduced, and the stability is improved.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to a method, a device and a system for monitoring DPF removal.
Background
In diesel aftertreatment systems, it is desirable to utilize DPFs to reduce engine particulate emissions. DPF removal is monitored in real time as required by the regulations. At present, a heavy-duty diesel vehicle generally adopts a monitoring strategy based on a differential pressure sensor, and the measured value of the differential pressure sensor on the whole vehicle is compared with a differential pressure limit value. However, due to the reasons of post-processing arrangement, differential pressure pipeline arrangement, air leakage and the like, deviation occurs in the differential pressure measurement value, even the DPF is falsely reported to be removed, and the stability of the monitoring strategy is reduced.
In summary, the conventional method for monitoring DPF removal has deviation of measured values and low stability.
Disclosure of Invention
The invention aims to at least solve the problems of deviation of measured values and low temperature in the existing method for monitoring DPF removal. The purpose is realized by the following technical scheme:
a first aspect of the invention proposes a method of monitoring DPF removal, wherein the method comprises the steps of:
acquiring a current upstream temperature value of the DPF and a current downstream temperature value of the DPF;
and calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and judging that the DPF is in a removal state according to the temperature difference value not greater than a preset temperature value.
According to the method for monitoring the removal of the DPF, disclosed by the invention, the temperature difference value is calculated according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, the DPF is judged to be in a removal state according to the condition that the temperature difference value is not larger than the preset temperature value, namely the difference between the DPF upstream temperature value and the DPF downstream temperature value is not large, and the DPF removal state is judged according to the temperature value, so that the deviation of the measured value can be reduced, and the stability is improved.
In addition, the method for monitoring DPF removal according to the present invention may also have the following additional technical features:
in some embodiments of the invention, said obtaining a current upstream temperature value of the DPF and a current downstream temperature value of the DPF; calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, wherein the step of calculating the temperature difference value according to the temperature difference value not greater than a preset temperature value comprises the following steps:
the method comprises the steps of obtaining current upstream temperature values of a plurality of DPF and current downstream temperature values of the DPF within a first preset time value, calculating an average temperature difference value according to the current upstream temperature values of the DPF and the current downstream temperature values of the DPF, and according to the average temperature difference value, not being larger than a preset average temperature value.
In some embodiments of the present invention, said determining that the average temperature difference is not greater than a preset average temperature value comprises:
and integrating the average temperature difference value, wherein the integral value of the average temperature difference value is not more than a preset integral value.
In some embodiments of the present invention, the obtaining the current upstream temperature value of the DPF and the current downstream temperature value of the DPF further comprises:
and judging the size of the DPF pressure difference value, and according to the condition that the pressure difference value is not more than a preset pressure value.
In some embodiments of the invention, the determining the DPF differential pressure value magnitude comprises:
acquiring the current upstream air quantity of the DPF and the current downstream air quantity of the DPF;
and obtaining the DPF pressure difference value according to the current upstream air quantity of the DPF and the current downstream air quantity of the DPF.
In some embodiments of the present invention, said determining that the differential pressure value is not greater than a preset pressure value comprises:
acquiring the current air inflow of the exhaust gas;
and obtaining a preset pressure value according to the current air inflow of the waste gas.
In some embodiments of the invention, the determining that the DPF is in a removed state comprises:
and sending the information of the DPF removal state to an alarm.
Another aspect of the present invention also provides an apparatus for monitoring DPF removal, which is used for executing the method for monitoring DPF removal, wherein the apparatus comprises: an acquisition unit and a judgment unit, wherein:
the acquisition unit is used for acquiring a current upstream temperature value of the DPF and a current downstream temperature value of the DPF;
the judgment unit is used for calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and judging that the DPF is in a removal state according to the temperature difference value not greater than a preset temperature value.
In another aspect of the present invention, a system for monitoring DPF removal is further provided, which comprises a memory and the above device for monitoring DPF removal, wherein the memory stores instructions of the above method for monitoring DPF removal;
the system for monitoring DPF removal further comprises: an engine;
a DPF in communication with the engine exhaust;
an upstream temperature sensor disposed at an air inlet of the DPF;
a downstream temperature sensor disposed at an outlet of the DPF.
In some embodiments of the invention, the system for monitoring DPF removal further comprises: an upstream differential pressure sensor disposed at an air inlet of the DPF;
a downstream differential pressure sensor disposed at an outlet of the DPF.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates a flow chart of a method of monitoring DPF removal according to an embodiment of the invention;
FIG. 2 schematically illustrates a logic control block diagram of a method of monitoring DPF removal according to an embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments 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.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the method for monitoring DPF removal in this embodiment, wherein the method comprises the steps of:
s1, acquiring a current upstream temperature value of the DPF and a current downstream temperature value of the DPF;
s2, calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and judging that the DPF is in a removal state according to the temperature difference value not greater than a preset temperature value.
Specifically, when the DPF carrier is removed, the difference in temperature between the upstream temperature and the downstream temperature of the DPF is not large. When the DPF carrier is normally present, the temperature downstream of the DPF, i.e., the temperature upstream of the SCR, may be lower than the temperature upstream of the DPF, and the difference between the temperature upstream and temperature downstream of the DPF is large. Therefore, the DPF is judged to be in a removal state according to the fact that the temperature difference value is not larger than a preset temperature value.
When the temperature value at the upstream of the DPF is not greatly different from the temperature value at the downstream of the DPF, the DPF is judged to be in a removal state, and the DPF removal state is judged through the temperature value, so that the deviation of a measured value can be reduced, and the stability is improved.
In some embodiments of the invention, said obtaining a current upstream temperature value of the DPF and a current downstream temperature value of the DPF; calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, wherein the step of calculating the temperature difference value according to the temperature difference value not greater than a preset temperature value comprises the following steps:
the method comprises the steps of obtaining current upstream temperature values of a plurality of DPF and current downstream temperature values of the DPF within a first preset time value, calculating an average temperature difference value according to the current upstream temperature values of the DPF and the current downstream temperature values of the DPF, and according to the average temperature difference value, not being larger than a preset average temperature value.
The current upstream temperature values of the plurality of DPFs and the current downstream temperature values of the DPFs in the first preset time value are obtained, an average temperature difference value can be calculated, and compared with the method for judging the state of the DPF through the temperature difference value of the upstream temperature and the downstream temperature of a single DPF, the method for monitoring DPF removal is better in stability.
In some embodiments of the present invention, said determining that the average temperature difference is not greater than a preset average temperature value comprises:
and integrating the average temperature difference value, wherein the integral value of the average temperature difference value is not more than a preset integral value.
The stability of the method of monitoring DPF removal can be increased by using an integration approach.
As shown in fig. 2, in some embodiments of the present invention, before acquiring the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, the method further includes:
and judging the size of the DPF pressure difference value, and according to the condition that the pressure difference value is not more than a preset pressure value.
And after the two aspects meet the requirements, the DPF removal fault is reported. The DPF temperature difference is judged again based on the judged DPF pressure difference value, so that the stability of the whole method for monitoring DPF removal can be improved.
In some embodiments of the invention, the determining the DPF differential pressure value magnitude comprises:
acquiring the current upstream air quantity of the DPF and the current downstream air quantity of the DPF;
and obtaining the DPF pressure difference value according to the current upstream air quantity of the DPF and the current downstream air quantity of the DPF.
In some embodiments of the present invention, said determining that the differential pressure value is not greater than a preset pressure value comprises:
acquiring the current air inflow of the exhaust gas;
and obtaining a preset pressure value according to the current air inflow of the waste gas.
The current air inflow of the waste gas can be measured by the air inflow sensor, the mass flow of the waste gas is obtained according to the current air inflow and the oil consumption of the waste gas, the volume flow of the waste gas is obtained through an ideal gas equation according to the mass flow of the waste gas, a corresponding preset pressure value is obtained according to the volume flow of the waste gas by inquiring an experimental data table, whether a pressure difference value is met or not is judged according to the comparison of a pressure difference value and the preset pressure value, and whether a temperature deviation condition is met or not is judged after the pressure difference value is met, so that the state of the DPF is judged.
In some embodiments of the invention, the determining that the DPF is in a removed state comprises:
and sending the information of the DPF removal state to an alarm. The DPF removal state can be reported through an alarm to prompt related personnel.
Another aspect of the present invention also provides an apparatus for monitoring DPF removal, which is used for executing the method for monitoring DPF removal, wherein the apparatus comprises: an acquisition unit and a judgment unit, wherein:
the acquisition unit is used for acquiring a current upstream temperature value of the DPF and a current downstream temperature value of the DPF;
the judgment unit is used for calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and judging that the DPF is in a removal state according to the temperature difference value not greater than a preset temperature value.
In another aspect of the present invention, a system for monitoring DPF removal is further provided, which comprises a memory and the above device for monitoring DPF removal, wherein the memory stores instructions of the above method for monitoring DPF removal;
the system for monitoring DPF removal further comprises: an engine;
a DPF in communication with the engine exhaust;
an upstream temperature sensor disposed at an air inlet of the DPF;
a downstream temperature sensor disposed at an outlet of the DPF.
The inlet of the DPF is connected to the outlet of the DOC, and the outlet of the DPF is connected to the inlet of the SCR, so the upstream temperature sensor can be arranged at the downstream of the DOC, and the downstream temperature sensor can be arranged at the upstream of the SCR.
In some embodiments of the invention, the system for monitoring DPF removal further comprises: an upstream differential pressure sensor disposed at an air inlet of the DPF;
a downstream differential pressure sensor disposed at an outlet of the DPF.
An upstream differential pressure sensor and a downstream differential pressure sensor are arranged to acquire the current upstream air quantity of the DPF and the current downstream air quantity of the DPF, so that the differential pressure values of the upstream air quantity and the downstream air quantity of the DPF can be measured. In order to facilitate the knowledge of the intake air amount of the exhaust gas, an intake air flow sensor is provided at the engine exhaust port.
In the method for monitoring DPF removal, when the engine is judged to operate under a certain steady-state working condition and a region with larger differential pressure division (for example, the exhaust gas amount is larger than a certain value), the actual differential pressure value is compared with a preset pressure value, when a certain time is met, the judgment result based on the differential pressure meets the requirement, in addition, if the temperature difference value is not larger than the preset temperature value, namely the temperature deviation is too small, the temperature deviation condition also meets the requirement, and after the two aspects meet the requirement, the DPF removal fault is reported.
In summary, in the method for monitoring DPF removal of the present invention, a temperature difference is calculated according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and according to the fact that the temperature difference is not greater than a preset temperature value, that is, when the difference between the DPF upstream temperature value and the DPF downstream temperature value is not large, the DPF is determined to be in a removal state, and the DPF removal state is determined according to the temperature value, so that the deviation of the measured value can be reduced, and the stability can be improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method of monitoring DPF removal, the method comprising the steps of:
acquiring a current upstream temperature value of the DPF and a current downstream temperature value of the DPF;
calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and judging that the DPF is in a removal state according to the temperature difference value not greater than a preset temperature value;
the obtaining of the current upstream temperature value of the DPF and the current downstream temperature value of the DPF further comprises:
and judging the size of the DPF pressure difference value, and according to the condition that the pressure difference value is not more than a preset pressure value.
2. The method of monitoring DPF removal of claim 1, wherein said obtaining a current upstream temperature value of the DPF and a current downstream temperature value of the DPF; calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, wherein the step of calculating the temperature difference value according to the temperature difference value not greater than a preset temperature value comprises the following steps:
the method comprises the steps of obtaining current upstream temperature values of a plurality of DPF and current downstream temperature values of the DPF within a first preset time value, calculating an average temperature difference value according to the current upstream temperature values of the DPF and the current downstream temperature values of the DPF, and according to the average temperature difference value, not being larger than a preset average temperature value.
3. The method of monitoring DPF removal of claim 2, wherein said determining that the average temperature difference is not greater than a preset average temperature value comprises:
and integrating the average temperature difference value, wherein the integral value of the average temperature difference value is not more than a preset integral value.
4. The method of monitoring DPF removal of claim 1, wherein said determining the magnitude of the DPF differential pressure value comprises:
acquiring the current upstream air quantity of the DPF and the current downstream air quantity of the DPF;
and obtaining the DPF pressure difference value according to the current upstream air quantity of the DPF and the current downstream air quantity of the DPF.
5. The method of monitoring DPF removal of claim 1, wherein said determining that the differential pressure value is not greater than a preset pressure value comprises:
acquiring the current air inflow of the exhaust gas;
and obtaining a preset pressure value according to the current air inflow of the waste gas.
6. The method of monitoring DPF removal of claim 1, wherein said determining that the DPF is in a removed state comprises:
and sending the information of the DPF removal state to an alarm.
7. An apparatus for monitoring DPF removal for performing the method of monitoring DPF removal of any one of claims 1-6, comprising: an acquisition unit and a judgment unit, wherein:
the acquisition unit is used for acquiring a current upstream temperature value of the DPF and a current downstream temperature value of the DPF;
the judgment unit is used for calculating a temperature difference value according to the current upstream temperature value of the DPF and the current downstream temperature value of the DPF, and judging that the DPF is in a removal state according to the temperature difference value not greater than a preset temperature value.
8. A system for monitoring DPF removal comprising a memory having stored therein instructions for a method of monitoring DPF removal as set forth in any one of claims 1 through 6 and an apparatus for monitoring DPF removal as set forth in claim 7;
the system for monitoring DPF removal further comprises: an engine;
a DPF in communication with the engine exhaust;
an upstream temperature sensor disposed at an air inlet of the DPF;
a downstream temperature sensor disposed at an outlet of the DPF.
9. The system for monitoring DPF removal of claim 8, further comprising: an upstream differential pressure sensor disposed at an air inlet of the DPF;
a downstream differential pressure sensor disposed at an outlet of the DPF.
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| CN114109570B (en) * | 2021-11-26 | 2023-04-14 | 浙江吉利控股集团有限公司 | Fault monitoring method for single-membrane differential pressure sensor for GPF (general purpose function) |
| CN114087057B (en) * | 2022-01-10 | 2022-04-12 | 潍柴动力股份有限公司 | double-DPF removal monitoring method and device and engine |
| CN114508407B (en) * | 2022-04-19 | 2022-08-05 | 潍柴动力股份有限公司 | Method and device for determining DPF removal |
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| CN103790684B (en) * | 2014-01-15 | 2017-01-04 | 潍柴动力股份有限公司 | The fault detection method of a kind of oxidation catalyzer and device |
| DE102014209840A1 (en) * | 2014-05-23 | 2015-11-26 | Robert Bosch Gmbh | Method and device for diagnosing a particulate filter |
| KR101776753B1 (en) * | 2016-03-15 | 2017-09-08 | 현대자동차 주식회사 | Device for controlling of cooling pan and method for controlling of cooling pan using the same |
| US10385754B2 (en) * | 2016-12-20 | 2019-08-20 | GM Global Technology Operations LLC | Method and apparatus for monitoring flow resistance in an exhaust aftertreatment system |
| DE102017205361A1 (en) * | 2017-03-29 | 2018-10-04 | Robert Bosch Gmbh | Method and computer program product for diagnosing a particulate filter |
| US10605137B2 (en) * | 2017-03-31 | 2020-03-31 | Ford Global Technologies, Llc | Methods and systems for exhaust catalyst diagnostics |
| CN108414141B (en) * | 2018-02-12 | 2020-03-17 | 中国第一汽车股份有限公司 | Method for diagnosing diesel engine DPF differential pressure sensor fault |
| EP3653854A1 (en) * | 2018-11-14 | 2020-05-20 | Ford Otomotiv Sanayi Anonim Sirketi | Diesel particulate filter monitoring |
| CN110295985B (en) * | 2019-06-30 | 2020-07-28 | 潍柴动力股份有限公司 | Method and device for detecting removal of diesel oxidation catalyst |
| CN110552771B (en) * | 2019-09-19 | 2021-10-08 | 潍柴动力股份有限公司 | Oxidation catalyst fault detection method, device, equipment and storage medium |
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