CN113356987B - DPF (diesel particulate filter) trapping efficiency low diagnosis method based on DPF equivalent pressure difference - Google Patents
DPF (diesel particulate filter) trapping efficiency low diagnosis method based on DPF equivalent pressure difference Download PDFInfo
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- CN113356987B CN113356987B CN202110677940.4A CN202110677940A CN113356987B CN 113356987 B CN113356987 B CN 113356987B CN 202110677940 A CN202110677940 A CN 202110677940A CN 113356987 B CN113356987 B CN 113356987B
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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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Abstract
The invention discloses a DPF trapping efficiency low diagnosis method based on DPF equivalent pressure difference, which comprises the following steps: starting DPF differential pressure sensor detection; obtaining a DPF equivalent pressure difference value; acquiring a lower limit value A of a fault diagnosis limit value; acquiring a fault diagnosis limit upper limit value B; acquiring an exhaust volume flow diagnosis lower limit value C; when the carbon loading capacity of the DPF model is larger than a fault diagnosis limit lower limit value A, the pressure difference carbon loading capacity of the DPF is smaller than a fault diagnosis limit upper limit value B, and the exhaust volume flow is larger than an exhaust volume flow diagnosis lower limit value C, judging whether the DPF equivalent differential pressure value is between a first preset equivalent differential pressure value X and a second equivalent differential pressure value Y; and when the DPF equivalent differential pressure value is between the first preset equivalent differential pressure value X and the second equivalent differential pressure value Y, diagnosing that the DPF trapping efficiency is low. Therefore, the DPF trapping efficiency low diagnosis method based on the DPF equivalent pressure difference can meet OBD spot check and has small false alarm risk, the calibration difficulty is reduced, and the calibration period is greatly shortened.
Description
Technical Field
The invention relates to the technical field of diesel vehicle particle filtration, in particular to a DPF equivalent pressure difference-based DPF capture efficiency low diagnosis method.
Background
The heavy diesel engine uses a DPF (diesel particulate trap) system to treat soot in exhaust gas, which has become the mainstream means of emission control at present, the DPF system absorbs soot in engine exhaust gas through a carrier, stores the soot particles on the DPF carrier, and when the soot is accumulated to a certain degree, the DPF system burns the soot on the carrier through a regeneration function to generate CO2 (carbon dioxide) which is discharged with the engine exhaust gas.
Based on the regulations of GB17691 limit of pollutant emission of heavy-duty diesel vehicles and measurement method (sixth stage of China), the performance of the DPF needs to be monitored, and when the performance of the DPF is reduced and the emission of particles exceeds the OBD limit, the OBD system should detect a fault. Most of the current electronic control software strategies use DPF (diesel particulate filter) differential pressure or DPF differential pressure carbon loading capacity for monitoring, namely after a diagnosis condition is met, the DPF differential pressure/DPF differential pressure carbon loading capacity is lower than a diagnosis limit value, namely a fault is reported, but the stability of the DPF differential pressure and the DPF differential pressure carbon loading capacity is poor, the fluctuation is large along with the working condition of an engine, and if the set diagnosis limit value is large, the fault false alarm risk is large; if the set diagnosis limit value is smaller, the OBD spot check cannot be met, a larger risk of not passing the spot check exists, the calibration difficulty is large, and the development period is long.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a DPF low-trapping-efficiency diagnosis method based on DPF equivalent pressure difference, which can simultaneously meet OBD spot check and has small false alarm risk, reduces calibration difficulty, and greatly shortens calibration period, thereby meeting diagnosis requirements.
In order to achieve the above object, the present invention provides a DPF trapping efficiency deterioration diagnosis method based on a DPF equivalent pressure difference, comprising: starting DPF differential pressure sensor detection; obtaining a DPF equivalent pressure difference value; acquiring a lower limit value A of a fault diagnosis limit value; acquiring a fault diagnosis limit upper limit value B; acquiring an exhaust volume flow diagnosis lower limit value C; when the carbon loading capacity of the DPF model is larger than a fault diagnosis limit lower limit value A, the pressure difference carbon loading capacity of the DPF is smaller than a fault diagnosis limit upper limit value B, and the exhaust volume flow is larger than an exhaust volume flow diagnosis lower limit value C, judging whether the DPF equivalent differential pressure value is between a first preset equivalent differential pressure value X and a second equivalent differential pressure value Y; and when the DPF equivalent differential pressure value is between the first preset equivalent differential pressure value X and the second equivalent differential pressure value Y, diagnosing that the DPF trapping efficiency is low.
In one embodiment of the invention, the DPF equivalent pressure differential value is calculated from the DPF differential pressure, exhaust volume flow rate, and exhaust density.
In one embodiment of the present invention, when the DPF model carbon loading is greater than the failure diagnosis limit lower limit a and the DPF differential pressure carbon loading is greater than the failure diagnosis limit upper limit B, the DPF trapping efficiency detection is passed.
In one embodiment of the invention, the detection is finished when the DPF model carbon loading is less than the lower failure diagnosis limit value a or the exhaust gas volume flow is less than the lower exhaust gas volume flow diagnosis limit value C.
Compared with the prior art, the DPF trapping efficiency low diagnosis method based on the DPF equivalent pressure difference can simultaneously meet OBD spot check and has small false alarm risk, reduces the calibration difficulty, greatly shortens the calibration period, and accordingly meets the diagnosis requirement.
Drawings
FIG. 1 is a schematic flow diagram of a DPF trapping inefficiency diagnostic method based on DPF equivalent pressure differential according to an embodiment of the invention;
FIG. 2 is a logic schematic of a DPF capture inefficiency diagnostic method based on a DPF equivalent pressure differential in accordance with an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations such as "comprises" or "comprising", etc., will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
FIG. 1 is a schematic flow diagram of a DPF trapping inefficiency diagnostic method based on DPF equivalent pressure differential according to an embodiment of the invention; FIG. 2 is a logic diagram of a DPF trapping inefficiency diagnostic method based on DPF equivalent pressure differential according to an embodiment of the invention.
As shown in fig. 1 to 2, a DPF trapping efficiency deterioration diagnosis method based on a DPF equivalent pressure difference according to a preferred embodiment of the present invention includes: s1, starting DPF differential pressure sensor detection; s2, obtaining a DPF equivalent differential pressure value; s3, acquiring a lower limit value A of a fault diagnosis limit value; s4, acquiring a fault diagnosis limit value upper limit value B; s5, acquiring an exhaust volume flow diagnosis lower limit value C; s6, when the carbon loading capacity of the DPF model is larger than the lower limit value A of the fault diagnosis limit value, the carbon loading capacity of the DPF differential pressure is smaller than the upper limit value B of the fault diagnosis limit value, and the exhaust volume flow is larger than the lower limit value C of the exhaust volume flow diagnosis limit value, judging whether the DPF equivalent differential pressure value is between a first preset equivalent differential pressure value X and a second equivalent differential pressure value Y; and S7, when the DPF equivalent differential pressure value is between the first preset equivalent differential pressure value X and the second equivalent differential pressure value Y, diagnosing that the DPF trapping efficiency is low.
In one embodiment of the invention, the DPF equivalent pressure differential value is calculated from the DPF differential pressure, exhaust volume flow rate, and exhaust density.
In one embodiment of the present invention, when the DPF model carbon loading is greater than the failure diagnosis limit lower limit a and the DPF differential pressure carbon loading is greater than the failure diagnosis limit upper limit B, the DPF trapping efficiency detection is passed.
In one embodiment of the invention, the detection is finished when the DPF model carbon loading is less than the lower failure diagnosis limit value a or the exhaust gas volume flow is less than the lower exhaust gas volume flow diagnosis limit value C.
In practical applications, the DPF equivalent differential pressure based DPF trapping efficiency inefficiency diagnosis method of the present invention diagnoses a DPF trapping efficiency inefficiency fault using the DPF equivalent differential pressure. The DPF equivalent pressure difference is calculated by parameters such as DPF pressure difference, exhaust volume flow, exhaust density and the like, the DPF equivalent pressure difference is related to the DPF pressure difference, but has stronger stability, and has smaller fluctuation along with the working condition of an engine, and when the OBD cycle test discharge is 20mg/kWh in the range meeting the OBD limit value requirement (25 +/-20% mg/kWh), the lower limit A of the fault diagnosis limit value is obtained through the test; when the OBD cycle test discharge is 30mg/kWh, the upper limit B of the fault diagnosis limit value is obtained through the test. The strategy sets diagnosis conditions as follows, and when the carbon loading of the DPF model exceeds a fault diagnosis limit lower limit A, the carbon loading of the DPF differential pressure is lower than a fault diagnosis limit upper limit B, the exhaust volume flow is greater than an exhaust volume flow diagnosis lower limit C, and X < DPF equivalent differential pressure < Y, a fault with low DPF collection efficiency is reported.
In a word, the DPF trapping efficiency low diagnosis method based on the DPF equivalent pressure difference can simultaneously meet OBD spot check and has small false alarm risk, the calibration difficulty is reduced, and the calibration period is greatly shortened, so that the diagnosis requirement is met.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (2)
1. A DPF trapping efficiency deterioration diagnosis method based on a DPF equivalent pressure difference, comprising:
starting DPF differential pressure sensor detection;
obtaining a DPF equivalent pressure difference value;
acquiring a lower limit value A of a fault diagnosis limit value;
acquiring a fault diagnosis limit upper limit value B;
acquiring an exhaust volume flow diagnosis lower limit value C;
when the carbon loading capacity of the DPF model is larger than the lower limit value A of the fault diagnosis limit value, the carbon loading capacity of the DPF differential pressure is smaller than the upper limit value B of the fault diagnosis limit value, and the exhaust volume flow is larger than the lower limit value C of the exhaust volume flow diagnosis limit value, judging whether the DPF equivalent differential pressure value is between a first preset equivalent differential pressure value X and a second equivalent differential pressure value Y; and
when the DPF equivalent differential pressure value is between the first preset equivalent differential pressure value X and the second equivalent differential pressure value Y, diagnosing that the DPF trapping efficiency is low;
wherein the DPF equivalent pressure difference value is calculated by DPF pressure difference, exhaust volume flow and exhaust density;
and when the carbon loading of the DPF model is greater than the lower limit A of the fault diagnosis limit and the carbon loading of the DPF differential pressure is greater than the upper limit B of the fault diagnosis limit, the detection of the DPF collection efficiency is passed.
2. The DPF trapping efficiency deterioration diagnosis method based on DPF equivalent pressure difference according to claim 1, wherein detection is ended when the DPF model carbon loading is smaller than the failure diagnosis limit lower limit value a or the exhaust gas volume flow is smaller than the exhaust gas volume flow diagnosis lower limit value C.
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| 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 |
| CN114370324B (en) * | 2022-01-19 | 2023-01-06 | 潍柴动力股份有限公司 | Method for diagnosing DPF system fault and vehicle |
| CN114718707B (en) * | 2022-03-08 | 2023-04-07 | 潍柴动力股份有限公司 | DPF fault diagnosis method for engineering vehicle and vehicle controller |
| CN115013131B (en) * | 2022-07-26 | 2023-11-17 | 潍柴动力股份有限公司 | DPF state monitoring method and device and vehicle |
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