CN114876617B - Diesel engine DPF ash quality estimation method and device and electronic equipment - Google Patents
Diesel engine DPF ash quality estimation method and device and electronic equipment Download PDFInfo
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- CN114876617B CN114876617B CN202210499729.2A CN202210499729A CN114876617B CN 114876617 B CN114876617 B CN 114876617B CN 202210499729 A CN202210499729 A CN 202210499729A CN 114876617 B CN114876617 B CN 114876617B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008929 regeneration Effects 0.000 claims abstract description 92
- 238000011069 regeneration method Methods 0.000 claims abstract description 92
- 230000001960 triggered effect Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 description 7
- 238000012937 correction Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 241000549548 Fraxinus uhdei Species 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- 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
- F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0232—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 using means for regenerating the filters, e.g. by burning trapped particles removing incombustible material from a particle filter, e.g. ash
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1611—Particle filter ash amount
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention belongs to the technical field of diesel engines, and discloses a method, a device and electronic equipment for estimating the ash quality of a diesel engine DPF, wherein the estimation method comprises the steps of obtaining the exhaust gas flow in an exhaust pipe and the first pressure difference at two ends of the DPF under the operating condition of the diesel engine when the DPF is completely regenerated; acquiring a second pressure difference at two ends of the DPF when the DPF in a fresh state corresponds to the exhaust gas flow in the exhaust pipe; and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the difference value of the first pressure difference and the second pressure difference. And the accumulated ash quality of the DPF when the regeneration of the DPF is thoroughly completed is obtained according to the difference value of the second pressure difference and the first pressure difference, the DPF is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operation process is not required to be considered, and the estimation accuracy of the ash quality is high and the deviation is smaller.
Description
Technical Field
The invention belongs to the technical field of diesel engines, and particularly relates to a method and a device for estimating ash quality of a diesel engine DPF and electronic equipment.
Background
This section provides merely background information related to the present disclosure and is not necessarily prior art.
The DPF (Diesel Particulate Filter ) is increasingly used as an essential component of diesel engine vehicles.
Particles generated by the operation of the diesel engine enter the DPF through the exhaust pipe, the DPF collects the particles together, after the particles reach a certain limit value, regeneration can be triggered, and fuel injection is performed through the nozzle to burn off combustible particles in the DPF, so that non-combustible particles, namely ash, are left.
Since ash can accumulate in the DPF, affecting the proper operation of the DPF, it is necessary to estimate the mass of ash in the DPF and feed it back to the relevant control unit of the diesel engine. At present, ash quality in DPF is estimated through mileage, but abnormal conditions such as engine oil burning and the like can occur in the running process of diesel engine, so that the ash quality can be rapidly increased, larger deviation can occur in estimating through mileage, and the accuracy is poor.
Disclosure of Invention
The invention aims to at least solve the problem of poor accuracy caused by estimating the ash quality through mileage in the prior art. The aim is achieved by the following technical scheme:
the first aspect of the present invention proposes a method for estimating the ash mass of a diesel DPF, comprising:
when the DPF is completely regenerated, acquiring the exhaust gas flow in an exhaust pipe of the diesel engine under the operating condition and the first pressure difference at two ends of the DPF;
acquiring a second pressure difference at two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow in the exhaust pipe;
and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the difference value of the first pressure difference and the second pressure difference.
According to the invention, through obtaining the exhaust gas flow of the diesel engine in the exhaust pipe and the first differential pressure at the two ends of the DPF under the operating condition and the second differential pressure at the two ends of the DPF in the fresh state when the DPF corresponds to the exhaust gas flow in the exhaust pipe, the accumulated ash quality of the DPF when the regeneration of the DPF is thoroughly completed is obtained according to the difference between the second differential pressure and the first differential pressure, the influence of the specification of the diesel engine is avoided, the abnormal condition of the diesel engine in the operating process is not required to be considered, and the estimation accuracy of the ash quality is high and the deviation is smaller.
In addition, the estimation method of ash quality of diesel DPF according to the present invention may further have the following additional technical features:
in some embodiments of the present invention, before the obtaining of the exhaust gas flow in the exhaust pipe and the first pressure difference across the DPF, further comprises:
determining the credibility of the measured value of the differential pressure sensor at two ends of the DPF;
and obtaining the first differential pressure according to the credibility of the measured value of the differential pressure sensor at the two ends of the DPF.
In some embodiments of the invention, the estimation method further comprises:
determining whether the DPF completely completes regeneration according to the fact that the measured value of the differential pressure sensor at two ends of the DPF is unreliable or not;
according to the DPF, the complete regeneration is triggered by pressure difference, and the DPF temperature and regeneration mileage in the complete regeneration of the DPF are obtained;
and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the DPF temperature and the regeneration mileage.
In some embodiments of the present invention, deriving the mass of ash accumulated by the DPF upon complete regeneration based on the DPF temperature and the regeneration mileage specifically includes:
acquiring the ratio of the interval of the DPF temperature greater than a first preset value in the regeneration mileage;
and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the interval to which the ratio belongs, the regeneration mileage and the corresponding ash curve which is compared with the interval.
In some embodiments of the present invention, the mass of ash accumulated by the DPF when regeneration is completed thoroughly is inversely related to the regeneration mileage.
In some embodiments of the invention, determining the trustworthiness of the measurement of the differential pressure sensor across the DPF specifically comprises:
when the diesel engine is in a specified working condition, and the display value of the differential pressure sensor is within a preset threshold value, the measurement value of the differential pressure sensor at two ends of the DPF is determined to be reliable.
In some embodiments of the present invention, determining whether the DPF has completed regeneration completely is pressure differential triggered based on the measurement of the pressure differential sensor across the DPF being unreliable further comprises:
according to the DPF, completely completing regeneration to be non-differential pressure triggering, and obtaining the corrected ECU (Electronic Control Unit ) mileage of the diesel engine;
and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the corrected ECU mileage.
In some embodiments of the present invention, the mass of ash accumulated by the DPF when the regeneration is completed thoroughly is inversely related to the regeneration mileage is specifically:
m= -K x s+b, where M is ash mass, s is regeneration mileage, K is coefficient, and b is constant.
A second aspect of the present invention proposes an estimation device of the ash mass of a diesel DPF, comprising:
the first acquisition unit is used for acquiring the exhaust gas flow in the exhaust pipe and the first pressure difference at two ends of the DPF under the operating condition of the diesel engine when the DPF is thoroughly regenerated; and
acquiring a second pressure difference at two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow in the exhaust pipe;
and the first calculation unit is used for obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the difference value of the second pressure difference and the first pressure difference.
According to the estimation device, the exhaust gas flow of the diesel engine in the exhaust pipe under the operating condition, the first differential pressure at the two ends of the DPF and the second differential pressure at the two ends of the DPF in the fresh state are obtained through the first acquisition unit, and the ash quality accumulated when the DPF is completely regenerated is obtained through the first calculation unit according to the difference between the second differential pressure and the first differential pressure, so that the estimation device is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operating process is not required to be considered, and the estimation accuracy of the ash quality is high and the deviation is small.
A third aspect of the present invention proposes an electronic device characterized by comprising: one or more processors; and a memory having stored thereon a program or instructions operable to implement the steps of the method of estimating ash mass of a diesel DPF as described in the above embodiments when executed by the estimating means.
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 reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 schematically illustrates a flow chart of a method of estimating ash mass of a diesel DPF according to an embodiment of the invention;
fig. 2 schematically shows an overall flow diagram of a method of estimating ash mass of a diesel DPF according to an embodiment of the invention.
Detailed Description
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" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "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 an order of performance is explicitly stated. It should also be appreciated 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 ease 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 … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.
As shown in fig. 1 to 2, a first aspect of a specific embodiment of the present invention provides a method for estimating ash quality of a diesel DPF, including:
when the DPF is completely regenerated, acquiring the exhaust gas flow in an exhaust pipe of the diesel engine under the operating condition and the first pressure difference at two ends of the DPF;
when the regeneration duration of the DPF reaches the preset duration, the DPF is determined to completely complete regeneration, and the preset duration can be determined according to the duration required by the DPF to completely complete regeneration. For example, the preset time period may be 25 or 35 minutes, and the preset time period may be determined according to the specification of the diesel engine. When the diesel engine runs, the generated particles enter the DPF through the exhaust pipe, after the particles accumulated by the DPF reach a certain limit value, the system triggers the DPF to regenerate, and when the regeneration triggering duration reaches a preset duration, the DPF can be considered to only remain ash. At this time, the exhaust gas flow in the exhaust pipe at the current moment and the first differential pressure across the DPF can be recorded, and when the detection is performed, differential pressure sensors can be respectively arranged at the two ends of the DPF air inlet end and the DPF air outlet end to measure the first differential pressure across the DPF, wherein the first differential pressure is recorded as P 2 。
When the regeneration is considered to be completed completely, the flow rate of the exhaust gas in the exhaust pipe and the first differential pressure across the DPF must be immediately locked to avoid the influence of the newly generated particulates on the result.
Acquiring a second pressure difference at two ends of the DPF when the DPF in a fresh state corresponds to the exhaust gas flow in the exhaust pipe;
the fresh state is a state when ash has not yet been formed in the post-treatment development stage of the diesel engine. And calibrating the pretreated DPF state to obtain P=A.times.V, wherein P is the pressure difference, A is the resistance coefficient of the carrier, V is the volume flow of the exhaust gas, and A is a fixed coefficient for a diesel engine with a certain specific specification and is a parameter calibrated in advance. The second differential pressure P corresponding to the flow rate of the exhaust gas in the exhaust pipe can be calculated by the formula p=a×v 3 。
According to the first pressure difference P 2 And a second pressure difference P 3 The difference in (2) yields the ash accumulated by the DPF when the regeneration is completed thoroughlyAmount of the components.
The difference here is denoted by Δp, Δp=p 2 -P 3 Accumulated ash mass M of DPF when regeneration is thoroughly completed 2 Expressed by, wherein M 2 =a×Δp, where a is the resistance coefficient of the carrier, Δp is the difference, and ash mass M is determined according to the formula 2 。
By acquiring the exhaust gas flow in the exhaust pipe and the first pressure difference P between two ends of DPF of the diesel engine under the operating condition 2 And a second differential pressure P across the DPF when the fresh DPF is in a state corresponding to the exhaust gas flow rate in the exhaust pipe 3 According to the first pressure difference P 2 And a second pressure difference P 3 Is used to obtain the accumulated ash mass M of DPF when regeneration is completed thoroughly 2 The method is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the running process is not required to be considered, and the ash quality estimation accuracy is high and the deviation is small.
In some alternative embodiments, the exhaust gas flow in the exhaust pipe and the first pressure differential P across the DPF are taken 2 Before, still include: determining the credibility of the measured value of the differential pressure sensor at two ends of the DPF; obtaining a first differential pressure P according to the credibility of the measured value of the differential pressure sensor at two ends of the DPF 2 By this process, the degree of confidence of the measurement value of the differential pressure sensor can be recognized, so that the first differential pressure P measured by the differential pressure sensor 2 Is accurate and trusted.
Specifically, determining the trustworthiness of the measured value of the differential pressure sensor across the DPF specifically includes: when the diesel engine is in a specified working condition, and the display value of the differential pressure sensor is within a preset threshold value, the measurement value of the differential pressure sensor at two ends of the DPF is determined to be reliable.
The preset threshold value is calibrated data, the preset threshold value is pressure, and a range value is adopted, wherein the range value can be interval [ -2hPa,2hPa ], or [ -3hPa,3hPa ], so that errors caused by drift of the differential pressure sensor are eliminated. The specified conditions herein include idle conditions and/or idle conditions, which are common conditions for diesel engines, where no further deployment is performed.
In some alternative embodiments, the estimation method further comprises: determining whether the DPF is completely regenerated by differential pressure triggering according to the fact that the measured value of the differential pressure sensor at two ends of the DPF is unreliable; according to the differential pressure trigger for thoroughly completing the regeneration of the DPF, acquiring the temperature and the regeneration mileage of the DPF in the process of thoroughly completing the regeneration of the DPF; and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the temperature of the DPF and the regeneration mileage.
The ash mass obtained by DPF temperature and regeneration mileage is M 1 Marking, i.e. ash mass estimated by this route m=m 1 To facilitate the estimation of ash mass M with the one mentioned above 2 Distinguishing between them.
In some alternative embodiments, deriving the mass of ash accumulated by the DPF when regeneration is completed thoroughly from the DPF temperature and the regeneration mileage specifically includes: acquiring the ratio of the interval of DPF temperature larger than a first preset value in the regeneration mileage; and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the interval to which the ratio belongs and the regeneration mileage and the corresponding ash curve which is compared with the interval.
The first preset value here is a specific temperature value, and in actual selection, the temperature may be 300 ℃, or 302 ℃, or the like, and the interval to which the ratio belongs may be selected to be greater than 30%, or greater than 10% and less than 20%, or less than 10%, for example, which will be discussed below in terms of case expansion.
The mass of ash accumulated by a DPF when regeneration is completed thoroughly is inversely related to the regeneration mileage. That is, the greater the regeneration mileage, the less ash mass. The ash mass accumulated by the DPF when the regeneration is thoroughly completed is inversely related to the regeneration mileage, and is specifically: m is M 1 = -K s+b, where M 1 For ash mass, s is the regeneration mileage, K is a coefficient, related to the DPF carrier, and b is a constant.
Wherein when the ratio is greater than 30%, K can be selected from K 1 K is found from the regeneration mileage 1 Will be relatively small. When the ratio is more than 10% and less than 20%, K can be selected from K 2 Wherein K is 2 Greater than K 1 . When the ratio isWhen the interval of the genus is less than 10%, K can be selected as K 3 ，K 3 For the maximum of these three data, b is a fixed constant. In a diesel engine product of a certain specification, K 1 、K 2 、K 3 Are all fixed data, can be directly obtained from relevant parameters of the diesel engine, and the numerical value of the data is usually between 0.04 and 0.2.
Where K can be sized by the regeneration mileage and corresponding ratio interval, so that M can be employed 1 Calculation of ash mass M by = -ks+b 1 。
In some alternative embodiments, determining whether the DPF has completed regeneration completely is pressure differential triggered based on the measurement of the pressure differential sensor across the DPF being unreliable further comprises:
according to DPF, completely completing regeneration to be non-differential pressure triggering, and obtaining corrected ECU mileage of the diesel engine;
and obtaining the accumulated ash quality of the DPF when the regeneration is completely finished according to the corrected ECU mileage.
The corrected ECU mileage refers to the ECU mileage corrected by at least one of the rotational speed correction factor, the circulating oil supply correction factor, and the turbine post-exhaust pressure correction factor, and in this way, the actual operation condition of the diesel engine can be considered, and compared with the ECU mileage not corrected in the prior art, ash quality estimation can be more accurate. The ash mass M obtained in this way is M 0 To represent.
In order to more clearly show the flow of the method for estimating the ash quality of a diesel DPF, the following description will be given with reference to fig. 2, where the number is merely for convenience of description and does not represent the sequence of steps.
S21, determining that the DPF is completely regenerated; the determination of the complete regeneration of the DPF herein may be made by reference to the corresponding description in the above embodiments and will not be repeated here.
S22, when the diesel engine is in a specified working condition, determining whether the display value of the differential pressure sensor is within a preset threshold value; the appointed working condition can be an idle working condition or a parking working condition, and when the display of the differential pressure sensor is within a preset threshold value, the display value of the differential pressure sensor is credible.
S23, determining whether the DPF completely completes regeneration and is triggered by the pressure difference according to the fact that the display value of the pressure difference sensor is not in a preset threshold value; at this time, the display value of the differential pressure sensor is not credible, and whether the DPF is completely regenerated is triggered by the differential pressure is judged.
S24, completely completing regeneration non-differential pressure triggering according to the DPF, and outputting M=M 0 The method comprises the steps of carrying out a first treatment on the surface of the This is one way to achieve ash quality estimation.
S25, according to the condition that the DPF is thoroughly regenerated and is triggered by pressure difference, outputting M=M 1 The method comprises the steps of carrying out a first treatment on the surface of the This is another way of achieving ash quality estimation.
S26, acquiring a first pressure difference between two ends of the DPF under the current flow according to the display value of the pressure difference sensor being in a preset threshold value; at this time, the display value of the differential pressure sensor is trusted, and the first differential pressure at both ends of the DPF under the current flow can be obtained.
S30, acquiring a second pressure difference of the PDF in the fresh state under the current flow.
S27, obtaining a difference value between the first pressure difference and the second pressure difference; at this time, the difference between the first pressure difference and the second pressure difference can be considered as being caused by the ash mass, so that the ash mass M can be determined according to the difference and the current flow rate 2 。
S28, determining ash quality M according to the difference value and the current flow 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein M is 2 =a×Δp, where a is the coefficient of resistance of the carrier, to determine ash mass M 2 。
S29, output ash mass m=m 2 。
The above is an overall description of the invention with respect to the estimation method, wherein details not mentioned can be found in the previous embodiments.
In some alternative embodiments, the method of estimating ash mass of a diesel DPF further comprises: when the ash quality is greater than the limit value, a warning is sent out to remind a user of ash removal and maintenance.
A second aspect of the specific embodiment of the present invention provides an estimation apparatus for ash quality of a DPF of a diesel engine, comprising:
the first acquisition unit is used for acquiring the exhaust gas flow in the exhaust pipe and the first pressure difference at two ends of the DPF under the operating condition of the diesel engine when the DPF is thoroughly regenerated; obtaining a second pressure difference at two ends of the DPF when the exhaust flow of the DPF in a fresh state corresponds to the exhaust flow in the exhaust pipe;
and the first calculation unit is used for obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the difference value of the second pressure difference and the first pressure difference.
According to the estimation device, the exhaust gas flow of the diesel engine in the exhaust pipe under the operating condition, the first differential pressure at the two ends of the DPF and the second differential pressure at the two ends of the DPF in the fresh state are obtained through the first acquisition unit, and the ash quality accumulated when the DPF is completely regenerated is obtained through the first calculation unit according to the difference between the second differential pressure and the first differential pressure, so that the estimation device is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operating process is not required to be considered, and the estimation accuracy of the ash quality is high and the deviation is small.
In some alternative embodiments, the estimating means further comprises: and the judging unit is used for determining whether the DPF is completely regenerated and is triggered by the pressure difference according to whether the measured value of the pressure difference sensor at the two ends of the DPF is reliable or not.
In some optional embodiments, the estimation device further includes a second acquisition unit and a second calculation unit, where the second acquisition unit is configured to acquire a DPF temperature and a regeneration mileage during complete DPF regeneration; the second calculating unit is used for obtaining the accumulated ash quality of the DPF when the regeneration of the DPF is thoroughly completed according to the DPF temperature and the regeneration mileage, and specifically, the second calculating unit is used for obtaining the ratio of the interval of the DPF temperature which is larger than the first preset value in the regeneration mileage, and obtaining the accumulated ash quality when the regeneration of the DPF is thoroughly completed according to the interval to which the ratio belongs, the regeneration mileage and the corresponding ash curve which is compared with the interval.
In some alternative embodiments, the estimation device further comprises a third calculation unit for deriving the ash mass accumulated by the DPF when the regeneration is completed thoroughly, based on the corrected ECU mileage.
In some alternative embodiments, the estimating device further comprises a warning unit, wherein the warning unit is used for warning when the ash quality is greater than the limit value, so as to remind a user of ash cleaning maintenance.
Details of the estimation device that are not mentioned in the estimation method may refer to related embodiments of the estimation method, and will not be described herein.
A third aspect of a specific embodiment of the present invention provides an electronic device, including:
one or more processors; and a memory having stored thereon a program or instructions that, when executed by the estimation device, perform the steps of the method of estimating ash mass of a diesel DPF as in the previous embodiment.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (8)
1. A method for estimating ash mass of a diesel DPF, comprising:
determining the credibility of the measured value of the differential pressure sensor at two ends of the DPF;
obtaining a first differential pressure according to the credibility of the measured value of the differential pressure sensor at the two ends of the DPF;
when the DPF is thoroughly regenerated, acquiring the exhaust gas flow in an exhaust pipe and the first pressure difference at two ends of the DPF under the operating condition of the diesel engine;
acquiring a second pressure difference at two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow in the exhaust pipe;
obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the difference value of the first pressure difference and the second pressure difference;
determining whether the DPF completely completes regeneration according to the fact that the measured value of the differential pressure sensor at two ends of the DPF is unreliable or not;
according to the DPF, the complete regeneration is triggered by pressure difference, and the DPF temperature and regeneration mileage in the complete regeneration of the DPF are obtained;
and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the DPF temperature and the regeneration mileage.
2. The method for estimating the ash mass of a diesel DPF according to claim 1, characterized in that deriving the ash mass accumulated by the DPF when the regeneration is completed thoroughly from the DPF temperature and the regeneration mileage comprises in particular:
acquiring the ratio of the interval of the DPF temperature greater than a first preset value in the regeneration mileage;
and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the interval to which the ratio belongs, the regeneration mileage and the corresponding ash curve which is compared with the interval.
3. A method of estimating ash mass of a diesel DPF as defined in claim 2, wherein the accumulated ash mass of the DPF when the regeneration is completed thoroughly is inversely related to the regeneration mileage.
4. The method for estimating the ash mass of a diesel DPF according to claim 1, characterized in that determining the trustworthiness of the measured value of the differential pressure sensor across the DPF comprises in particular:
when the diesel engine is in a specified working condition, and the display value of the differential pressure sensor is within a preset threshold value, the measurement value of the differential pressure sensor at two ends of the DPF is determined to be reliable.
5. The method of estimating ash quality of a diesel DPF of claim 1, wherein determining whether the DPF has completed regeneration completely is pressure differential triggered based on the measured value of the pressure differential sensor across the DPF being unreliable further comprises:
according to the DPF, completely completing regeneration to be non-differential pressure triggering, and obtaining the corrected ECU mileage of the diesel engine;
and obtaining the accumulated ash quality of the DPF when the regeneration is thoroughly completed according to the corrected ECU mileage.
6. A method for estimating the ash mass of a diesel DPF according to claim 3, characterized in that the accumulated ash mass of the DPF when the regeneration is completed thoroughly is inversely related to the regeneration mileage is specifically:
m= -K x s+b, where M is ash mass, s is regeneration mileage, K is coefficient, and b is constant.
7. An estimation apparatus of a diesel DPF ash mass for implementing the estimation method of a diesel DPF ash mass according to claim 1, characterized by comprising:
the first acquisition unit is used for acquiring the exhaust gas flow in the exhaust pipe and the first pressure difference at two ends of the DPF under the operating condition of the diesel engine when the DPF is thoroughly regenerated; and
acquiring a second pressure difference at two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow in the exhaust pipe;
the judging unit is used for determining whether the DPF is completely regenerated and is triggered by the pressure difference according to whether the measured value of the pressure difference sensor at two ends of the DPF is reliable or not;
a first calculation unit for obtaining an ash mass accumulated by the DPF when regeneration is completely completed according to a difference between the second differential pressure and the first differential pressure;
the second acquisition unit is used for acquiring the DPF temperature and the regeneration mileage in the process of thoroughly completing the regeneration of the DPF; the second calculation unit is used for obtaining the accumulated ash quality of the DPF when the regeneration of the DPF is thoroughly completed according to the temperature of the DPF and the regeneration mileage.
8. An electronic device, comprising:
one or more processors; and
a memory having stored thereon a re-executable program or instructions which when executed by an estimation device perform the steps of the method of estimating ash mass of a diesel DPF as set forth in claim 1.
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