CN109653852B - Diesel engine particle trap ash removal treatment judgment method and device - Google Patents
Diesel engine particle trap ash removal treatment judgment method and device Download PDFInfo
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- CN109653852B CN109653852B CN201811572357.1A CN201811572357A CN109653852B CN 109653852 B CN109653852 B CN 109653852B CN 201811572357 A CN201811572357 A CN 201811572357A CN 109653852 B CN109653852 B CN 109653852B
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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 provides a method and a device for judging the ash removal treatment of a diesel particulate filter, which are applied to the technical field of diesel engines. According to the method for judging the ash removal treatment of the diesel particulate filter, the influence of ash deposition on the outlet temperature and the exhaust flow in the DPF regeneration process is comprehensively considered, and whether the ash removal treatment of the diesel particulate filter is needed or not can be accurately judged.
Description
Technical Field
The invention belongs to the technical field of diesel engines, and particularly relates to a method and a device for judging ash removal treatment of a diesel particulate filter.
Background
A Diesel Particulate Filter (DPF) is a ceramic Filter installed in an exhaust system of a diesel engine, and traps and collects particulate emissions generated during the operation of the diesel engine, thereby preventing the particulate emissions from entering the air. The particle catcher can reduce the soot generated by the diesel engine by more than 90 percent, and is an effective device for solving the problem of particulate matter emission of the diesel engine.
Because the diesel particulate filter continuously captures and collects particulate matters in exhaust gas, the diesel particulate filter needs to be regenerated periodically to ensure the normal operation of the diesel particulate filter. However, ash which is difficult to gasify and remove is deposited inside the diesel particulate trap during the regeneration treatment process, and the deposited ash occupies a large amount of space inside the diesel particulate trap, so that the physical structure of the diesel particulate trap is changed, the diesel particulate trap cannot work normally, and therefore the ash deposited inside the diesel particulate trap needs to be removed regularly.
In view of the above, how to accurately determine whether the soot cleaning process is required for the diesel particulate filter becomes one of the technical problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method and a device for determining ash removal treatment of a diesel particulate filter, which are used for more accurately determining whether the diesel particulate filter needs to be subjected to ash removal treatment, and the specific scheme is as follows:
in a first aspect, the invention provides a method for judging soot cleaning treatment of a diesel particulate filter, comprising the following steps:
acquiring an outlet temperature peak value of the DPF of the diesel particulate filter in the regeneration process;
when the regeneration process is finished and the state of the DPF meets a preset condition, acquiring a differential pressure value of the DPF under a target exhaust flow rate;
determining a pressure difference limit value corresponding to the target exhaust flow;
and if the outlet temperature peak value is greater than or equal to a first preset temperature threshold value and the pressure difference value is greater than or equal to the pressure difference limit value, judging that the DPF needs to be subjected to ash removal treatment.
Optionally, the method for determining ash removal treatment of a diesel particulate filter according to the first aspect of the present invention further includes:
acquiring the driving mileage of the vehicle;
and when the vehicle driving mileage reaches a preset mileage limit value, judging that the DPF needs ash removal treatment.
Optionally, the preset conditions include: the inlet temperature of the DPF is reduced to a second preset temperature threshold.
Optionally, the determining a differential pressure limit corresponding to the target exhaust flow rate includes:
calling a preset calculation formula representing the corresponding relation between the exhaust flow and the pressure difference limit value;
and calculating to obtain a pressure difference limit value corresponding to the target exhaust flow according to the target exhaust flow and the preset calculation formula.
Optionally, the method for determining ash removal treatment of a diesel particulate filter according to any one of the first aspect of the present invention further includes:
and sending first alarm information after the DPF is judged to need ash removal treatment.
Optionally, the method for determining ash removal treatment of a diesel particulate filter according to the first aspect of the present invention further includes:
counting and judging the number of times of the DPF needing ash removal treatment;
and when the obtained statistical frequency is greater than a preset frequency threshold value, sending second alarm information.
In a second aspect, the present invention provides a device for determining ash removal treatment of a diesel particulate filter, comprising:
the device comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring an outlet temperature peak value of the DPF during the regeneration process of the diesel particulate filter;
a second obtaining unit, configured to obtain a differential pressure value of the DPF at a target exhaust flow rate when the regeneration process is finished and a state of the DPF satisfies a preset condition;
a differential pressure limit value determination unit used for determining a differential pressure limit value corresponding to the target exhaust flow;
and the first judgment unit is used for judging that the DPF needs ash removal treatment if the outlet temperature peak value is greater than or equal to a first preset temperature threshold value and the pressure difference value is greater than or equal to the pressure difference limit value.
Optionally, the device for determining ash removal treatment of a diesel particulate filter according to a second aspect of the present invention further includes:
the third acquisition unit is used for acquiring the driving mileage of the vehicle;
and the second judging unit is used for judging that the DPF needs ash removal treatment when the driving mileage of the vehicle reaches a preset mileage limit value.
Optionally, the pressure difference limit determining unit, when determining the pressure difference limit corresponding to the target exhaust flow rate, specifically includes:
calling a preset calculation formula representing the corresponding relation between the exhaust flow and the pressure difference limit value;
and calculating to obtain a pressure difference limit value corresponding to the target exhaust flow according to the target exhaust flow and the preset calculation formula.
Optionally, the device for determining ash removal treatment of a diesel particulate filter according to a second aspect of the present invention further includes:
and the sending unit is used for sending first alarm information after the DPF is judged to need ash removal treatment.
Based on the above technical solution, the method and apparatus for determining ash removal processing of a diesel particulate filter provided by the present invention take outlet temperature during DPF regeneration and corresponding relationship between DPF pressure difference value and ash deposition amount as analysis basis, first obtain outlet temperature peak value during regeneration of the DPF, then obtain pressure difference value of the DPF at target exhaust flow rate after regeneration process and when DPF state meets preset conditions, because different ash deposition amounts can make the DPF show different pressure difference values for the same exhaust flow rate, further determine pressure difference limit value corresponding to the target exhaust flow rate, finally compare the obtained outlet temperature peak value with the pressure difference value at the target exhaust flow rate, if the outlet temperature peak value is greater than or equal to a first preset temperature threshold value, and the obtained pressure difference value is greater than or equal to the corresponding pressure difference limit value, it can be determined that the DPF requires soot cleaning. According to the method for judging the ash removal treatment of the diesel particulate filter, the influence of ash deposition on the outlet temperature and the exhaust flow in the DPF regeneration process is comprehensively considered, and whether the ash removal treatment of the diesel particulate filter is needed or not can be accurately judged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining soot cleaning treatment of a diesel particulate filter according to an embodiment of the present invention;
FIG. 2 is a graph showing the relationship between outlet temperature and ash deposition in the soot cleaning method for a diesel particulate filter according to an embodiment of the present invention;
FIG. 3 is a graph of pressure difference limit versus exhaust flow rate in a method for determining soot cleaning treatment of a diesel particulate filter according to an embodiment of the present invention;
FIG. 4 is a graph showing the relationship between ash deposition amount and mileage in the soot cleaning method for a diesel particulate filter according to an embodiment of the present invention;
FIG. 5 is a block diagram of a device for determining ash removal of a diesel particulate filter according to an embodiment of the present invention;
FIG. 6 is a block diagram of another device for determining ash removal of a diesel particulate filter according to an embodiment of the present invention;
fig. 7 is a block diagram of a configuration of a device for determining ash removal treatment of a diesel particulate filter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for determining ash removal of a Diesel Particulate Filter according to an embodiment of the present invention, where the method may be applied to a controller disposed in a vehicle such as a vehicle controller and a traveling computer, or other controllers capable of obtaining vehicle state parameters, and is used to determine whether ash removal of a DPF (Diesel Particulate Filter) is required, and obviously, the method may also be applied to a server on a network side; referring to fig. 1, a method for determining ash removal treatment of a diesel particulate filter according to an embodiment of the present invention may include:
and step S100, acquiring an outlet temperature peak value of the DPF in the regeneration process.
The inventors have found that the more ash inside the DPF, the smaller its effective volume, while the greater the resistance of the exhaust gas to flow through the cake layer of ash. In this way, the more the ash content is, the higher the temperature generated inside the DPF during regeneration is, and the higher the regeneration temperature will cause the DPF outlet temperature to rise, and the outlet temperature monitored by the DPF outlet temperature sensor can reflect the deposition of the ash content inside the DPF.
Referring to fig. 2, fig. 2 is a graph showing the relationship between outlet temperature and ash deposition amount in the soot cleaning treatment determination method for a diesel particulate filter according to an embodiment of the present invention. As can be seen from fig. 2, the DPF outlet temperature is linear with the amount of ash deposition of the DPF, and the higher the amount of ash deposition, the higher the corresponding DPF outlet temperature.
In order to accurately judge the ash deposition condition in the DPF, the determination method provided by the embodiment of the present invention needs to acquire the outlet temperature peak of the DPF during the regeneration process, that is, the highest temperature value that can be read from the outlet of the DPF during the whole DPF regeneration process. Specifically, a specific temperature value can be obtained through a temperature sensor arranged at an outlet of the DPF in the prior art, and details are not repeated here.
The method for determining the ash removal treatment of the diesel particulate filter according to the embodiment of the present invention can be applied to each regeneration process of the DPF, and the outlet temperature peak of the DPF during the regeneration process is obtained during the corresponding regeneration process of the DPF. Of course, the determination method provided in the present embodiment may be used periodically to determine whether or not the DPF requires soot cleaning, depending on the actual situation.
And step S110, acquiring a pressure difference value of the DPF under the target exhaust flow when the regeneration process is finished and the state of the DPF meets a preset condition.
Because the pressure difference value of the DPF and the exhaust flow passing through the DPF have a direct corresponding relationship, optionally, referring to fig. 3, fig. 3 is a relationship curve of the pressure difference limit value-exhaust flow in the soot cleaning treatment determination method for the diesel particulate filter according to the embodiment of the present invention. As can be seen from fig. 3, the greater the flow rate of exhaust gas passing through the DPF, the greater the differential pressure value read by the DPF differential pressure sensor. Different amounts of ash within the DPF may exhibit different differential pressure values at the same exhaust flow rate. Therefore, whether the ash removal treatment of the DPF is needed or not can be judged according to different differential pressure values obtained by measuring the DPF under the same exhaust gas flow rate.
In order to determine the DPF differential pressure value after the regeneration process is finished, in this embodiment, a target exhaust flow rate is given, and then the DPF differential pressure value corresponding to the target exhaust flow rate is obtained. It is conceivable that the target exhaust flow rate may be any exhaust flow rate that the vehicle can emit, and the specific value of the target exhaust flow rate is not limited in the present application.
Further, the regeneration process of the DPF is actually a process of burning and consuming the particles deposited inside the DPF, the DPF must have a higher temperature during regeneration, and the temperature of the DPF can influence the accuracy of the DPF differential pressure value acquired by the differential pressure sensor arranged in the DPF, so that a corresponding preset condition needs to be set, and the time for acquiring the DPF differential pressure value is limited.
Optionally, the preset condition may be: after the regeneration process is finished, the inlet temperature of the DPF is reduced to a second preset temperature threshold value. When the inlet temperature of the DPF meets the preset condition, the differential pressure value of the DPF can be obtained.
To sum up, in order to achieve a more accurate determination effect, the present embodiment obtains the differential pressure value of the DPF at the target exhaust flow rate when the regeneration process is finished and the state of the DPF satisfies the preset condition.
And step S120, determining a pressure difference limit value corresponding to the target exhaust flow.
As mentioned above, the DPF will exhibit different pressure differences for different exhaust gas flow rates, and accordingly, the pressure difference exhibited by the DPF will necessarily have a corresponding upper limit for different exhaust gas flow rates. That is, for any determined exhaust flow, there is a pressure difference limit, and when the obtained DPF pressure difference exceeds the corresponding pressure difference limit, it is necessary to consider whether the DPF needs to be ash-cleaned, or the DPF has low working efficiency and is no longer suitable for further use.
Therefore, after acquiring the differential pressure value corresponding to the target exhaust flow rate, it is necessary to further determine the DPF differential pressure limit corresponding to the target exhaust flow rate.
Optionally, an embodiment of the present invention provides a calculation formula for calculating a PDF differential pressure limit value, where the calculation formula is as follows:
Δp＝k1×mrow board+C1(1)
Wherein m isRow boardThe unit kg/h represents the actual exhaust gas flow rate passing through the DPF;
Δ p represents the DPF flow rate mRow boardThe corresponding pressure difference limit value is in unit of kPa;
k1and C1Are empirical coefficients and are determined by experiment.
Optionally, after the target exhaust flow rate is determined, a preset calculation formula (1) may be called, and the specific value of the target exhaust flow rate is assigned to the parameter mRow boardThe corresponding pressure differential limit may be calculated.
It should be noted that, the difference of vehicle operating conditions and the difference of DPF specifications will cause the coefficient k in the formula (1)1And C1In a particular application, k needs to be determined specifically as the case may be1And C1The value of (a).
Step S130, judging whether the outlet temperature peak value is larger than or equal to a first preset temperature threshold value or not, and the pressure difference value is larger than or equal to a pressure difference limit value, if so, executing step S140; if not, go to step S150.
After the pressure difference value under the DPF outlet temperature peak value and the target exhaust flow and the pressure difference limit value corresponding to the target exhaust flow are obtained, whether the DPF needs to be subjected to ash removal treatment or not can be judged. If the DPF outlet temperature peak value is greater than or equal to a first preset outlet temperature threshold value and the DPF pressure difference value is greater than or equal to a pressure difference limit value, executing a step S140, and judging that ash removal treatment is needed; otherwise, step S150 is executed to end the determination process.
And step S140, judging that the DPF needs ash removal treatment.
And under the conditions that the DPF outlet temperature peak value is greater than or equal to a first preset outlet temperature threshold value and the DPF pressure difference value is greater than or equal to a pressure difference limit value, determining that the DPF needs ash removal treatment.
And step S150, ending the judging process.
If the DPF outlet temperature peak value is smaller than the first preset outlet temperature threshold value and/or the DPF pressure difference value is smaller than the pressure difference limit value, the DPF can be continuously used after the current regeneration process is finished, and the judgment process is directly exited.
In summary, according to the method for determining the ash removal treatment of the diesel particulate filter provided by the embodiment of the invention, the influence of the ash deposition amount on the outlet temperature and the exhaust flow in the DPF regeneration process is comprehensively considered, and whether the ash removal treatment of the diesel particulate filter is needed or not can be accurately determined.
Further, according to the requirements of relevant regulations, when the mileage of the vehicle meets the mileage limit, the vehicle must perform DPF ash removal treatment once, so the method for determining ash removal treatment of the diesel particulate filter provided by the embodiment of the application may further include:
and acquiring the driving mileage of the vehicle. Optionally, the driving mileage recorded by the vehicle odometer can be directly read, and of course, other methods in the prior art can be adopted to determine the driving mileage of the vehicle. And when the driving mileage of the vehicle reaches the preset driving mileage, judging that the DPF needs to be subjected to ash removal treatment.
Optionally, referring to fig. 4, fig. 4 is a graph showing a relationship between ash deposition amount and mileage of the DPF in the soot cleaning method for a diesel particulate filter according to an embodiment of the present invention, and it can be clearly seen from fig. 4 that the ash deposition amount of the DPF is linearly related to the mileage, and the mileage is increased, and the ash deposition amount of the DPF is increased accordingly.
According to the curve shown in FIG. 4, and the corresponding experimental data, the embodiment of the present application further provides a calculation formula for calculating the deposition amount of DPF ash by using the vehicle mileage, as follows:
n＝k2×S+C2(2)
wherein n is DPF ash deposition amount, and the unit is g/L;
s is the vehicle mileage, unit km;
k2、C2the empirical coefficient is determined according to experimental data or experience.
And substituting the driving mileage of the vehicle into the formula 2 to calculate the ash deposition amount corresponding to the substituted driving mileage.
Further, according to the above, the embodiment of the present application further provides a method for determining the DPF outlet temperature limit, as follows:
according to the corresponding relationship between the DPF outlet temperature and the DPF ash deposition amount shown in fig. 2, an embodiment of the present invention provides a calculation formula for expressing a functional relationship between the DPF outlet temperature and the DPF ash deposition amount, as follows:
T＝k3×n+C3(3)
wherein T represents the outlet temperature of the DPF in units;
n represents the ash deposition amount of DPF, g/L;
k3and C3The empirical coefficient is determined according to experimental data or experience.
According to the formula (2), the corresponding relation between the vehicle mileage and the ash deposition amount of the DPF can be known, and meanwhile, according to the regulations of relevant regulations, when the vehicle mileage reaches the preset mileage, the ash removal treatment must be carried out on the DPF, so that the preset mileage can be substituted into the formula (2) as the known amount, and the corresponding ash deposition amount of the DPF when the ash removal treatment must be carried out can be further obtained.
After obtaining the corresponding ash deposition amount when ash removal is necessary, the outlet temperature limit value of the corresponding DPF during regeneration can be obtained according to the formula (3) and used in the calculation process. Of course, this is only an alternative and the given manner of outlet temperature limit is not limited thereto.
Optionally, after it is determined that the DPF needs to be subjected to soot cleaning, first alarm information can be sent to remind a driver of performing soot cleaning on the DPF. The form of first alarm information can be the pilot lamp that lights corresponding setting on the panel board, perhaps, the stereo set equipment is predetermine in the drive, like bee calling organ etc. to the driver is reminded to the alarm sound. Of course, the first alarm information can also be sent to a mobile terminal which establishes wireless connection in advance through a wireless network.
Alternatively, because of the limited service life of the DPF, after the DPF has been used for a certain period of time, the intended function of the DPF cannot be recovered even if regeneration is performed, and the DPF must be replaced. Therefore, the number of times that the DPF needs to be subjected to ash removal treatment can be counted and judged, and when the obtained counted number is larger than a preset number threshold, second alarm information is sent to prompt a driver to replace the DPF. It is conceivable that the form of sending the second alarm information may be set with reference to the form of the first alarm information, and details thereof are not described here.
The following introduces the device for determining the soot cleaning treatment of the diesel particulate filter provided by the embodiment of the present invention, and the device for determining the soot cleaning treatment of the diesel particulate filter described below may be regarded as a functional module architecture that needs to be arranged in the central device to implement the method for determining the soot cleaning treatment of the diesel particulate filter provided by the embodiment of the present invention; the following description may be cross-referenced with the above.
Fig. 5 is a block diagram of a device for determining ash removal treatment of a diesel particulate filter according to an embodiment of the present invention, and referring to fig. 5, the device may include:
a first obtaining unit 10 for obtaining an outlet temperature peak of the diesel particulate filter DPF during a regeneration process;
a second obtaining unit 20, configured to obtain a differential pressure value of the DPF at a target exhaust flow rate when the regeneration process is ended and a state of the DPF satisfies a preset condition;
a differential pressure limit determination unit 30 configured to determine a differential pressure limit corresponding to the target exhaust gas flow rate;
and the first determination unit 40 is configured to determine that the DPF needs soot cleaning if the outlet temperature peak value is greater than or equal to a first preset temperature threshold value and the pressure difference value is greater than or equal to the pressure difference limit value.
Optionally, referring to fig. 6, fig. 6 is a block diagram of another diesel particulate filter soot cleaning processing determining device according to an embodiment of the present invention, where the device may further include, on the basis of the embodiment shown in fig. 5:
a third acquiring unit 50 for acquiring the vehicle mileage;
and a second determining unit 60, configured to determine that the DPF needs soot cleaning when the vehicle mileage reaches a preset mileage limit.
Optionally, the pressure difference limit determining unit 30 is configured to, when determining the pressure difference limit corresponding to the target exhaust flow, specifically include:
calling a preset calculation formula representing the corresponding relation between the exhaust flow and the pressure difference limit value;
and calculating to obtain a pressure difference limit value corresponding to the target exhaust flow according to the target exhaust flow and the preset calculation formula.
Optionally, referring to fig. 7, fig. 7 is a block diagram of a structure of a device for determining ash removal treatment of a diesel particulate filter according to another embodiment of the present invention, where the device may further include, based on the embodiment shown in fig. 5:
and the sending unit 70 is used for sending first alarm information after the fact that the DPF needs ash removal treatment is judged.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method for judging the ash removal treatment of a diesel particulate filter is characterized by comprising the following steps:
acquiring an outlet temperature peak value of the DPF of the diesel particulate filter in the regeneration process;
when the regeneration process is finished and the state of the DPF meets a preset condition, acquiring a pressure difference value of the DPF under a target exhaust flow rate, wherein the preset condition comprises that the inlet temperature of the DPF is reduced to a second preset temperature threshold;
calling a preset calculation formula representing the corresponding relation between the exhaust flow and the pressure difference limit value;
calculating to obtain a pressure difference limit value corresponding to the target exhaust flow according to the target exhaust flow and the preset calculation formula;
the preset calculation formula is as follows:
Δp＝k1×mrow board+C1
Wherein m isRow boardThe unit kg/h represents the actual exhaust gas flow rate passing through the DPF;
Δ p represents the DPF flow rate mRow boardThe corresponding pressure difference limit value is in unit of kPa;
k1and C1All are empirical coefficients, determined by experiment;
and if the outlet temperature peak value is greater than or equal to a first preset temperature threshold value and the pressure difference value is greater than or equal to the pressure difference limit value, judging that the DPF needs to be subjected to ash removal treatment.
2. The method for determining ash removal treatment of a diesel particulate filter according to claim 1, further comprising:
acquiring the driving mileage of the vehicle;
and when the vehicle driving mileage reaches a preset mileage limit value, judging that the DPF needs ash removal treatment.
3. The method for determining soot cleaning treatment of a diesel particulate filter according to any one of claims 1-2, further comprising:
and sending first alarm information after the DPF is judged to need ash removal treatment.
4. The method for determining soot cleaning treatment of a diesel particulate filter according to claim 1, further comprising:
counting and judging the number of times of the DPF needing ash removal treatment;
and when the obtained statistical frequency is greater than a preset frequency threshold value, sending second alarm information.
5. The utility model provides a diesel engine particle trap deashing handles decision maker which characterized in that includes:
the device comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring an outlet temperature peak value of the DPF during the regeneration process of the diesel particulate filter;
a second obtaining unit, configured to obtain a differential pressure value of the DPF at a target exhaust flow rate when the regeneration process is finished and a state of the DPF satisfies a preset condition, where the preset condition includes that an inlet temperature of the DPF is reduced to a second preset temperature threshold;
the pressure difference limit value determining unit is used for calling a preset calculation formula representing the corresponding relation between the exhaust flow and the pressure difference limit value; calculating to obtain a pressure difference limit value corresponding to the target exhaust flow according to the target exhaust flow and the preset calculation formula;
the preset calculation formula is as follows:
Δp＝k1×mrow board+C1
Wherein m isRow boardThe unit kg/h represents the actual exhaust gas flow rate passing through the DPF;
Δ p represents the DPF flow rate mRow boardThe corresponding pressure difference limit value is in unit of kPa;
k1and C1All are empirical coefficients, determined by experiment;
and the first judgment unit is used for judging that the DPF needs ash removal treatment if the outlet temperature peak value is greater than or equal to a first preset temperature threshold value and the pressure difference value is greater than or equal to the pressure difference limit value.
6. The device for determining ash removal treatment of a diesel particulate filter according to claim 5, further comprising:
the third acquisition unit is used for acquiring the driving mileage of the vehicle;
and the second judging unit is used for judging that the DPF needs ash removal treatment when the driving mileage of the vehicle reaches a preset mileage limit value.
7. The device for determining soot cleaning treatment of a diesel particulate filter according to any one of claims 5 to 6, further comprising:
and the sending unit is used for sending first alarm information after the DPF is judged to need ash removal treatment.
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| CN111520219A (en) * | 2020-03-31 | 2020-08-11 | 潍柴动力股份有限公司 | Method and device for judging soot cleaning of DPF of engine |
| CN111677595A (en) * | 2020-06-29 | 2020-09-18 | 潍柴动力股份有限公司 | Crystallization processing method, device and post-processing system |
| CN111911268B (en) * | 2020-06-29 | 2022-01-25 | 东风汽车集团有限公司 | Method for calculating GPF regeneration quality threshold of hybrid vehicle |
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| JP6197377B2 (en) * | 2013-06-03 | 2017-09-20 | いすゞ自動車株式会社 | Exhaust purification device |
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| CN108915832B (en) * | 2018-06-20 | 2020-06-26 | 潍柴动力股份有限公司 | Diesel engine DPF ash removal control method |
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