CN114876617A - 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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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008929 regeneration Effects 0.000 claims abstract description 87
- 238000011069 regeneration method Methods 0.000 claims abstract description 87
- 230000001960 triggered effect Effects 0.000 claims description 11
- 230000000875 corresponding effect Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 230000002596 correlated effect Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 239000008187 granular material Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 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
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
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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
- 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
Abstract
The invention belongs to the technical field of diesel engines, and discloses a method, a device and electronic equipment for estimating the ash content of a diesel engine DPF (diesel particulate filter), wherein the estimation method comprises the steps of obtaining the flow rate of exhaust gas in an exhaust pipe of the diesel engine and a first pressure difference at two ends of the DPF under the operation working condition when the DPF completely completes regeneration; acquiring a second pressure difference between two ends of the DPF when the DPF is in a fresh state and corresponds to the exhaust gas flow in the exhaust pipe; and obtaining the ash mass accumulated when the DPF is completely regenerated according to the difference value of the first pressure difference and the second pressure difference. The ash mass accumulated when the regeneration of the DPF is completely finished is obtained according to the difference value of the second pressure difference and the first pressure difference, the ash mass is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operation process does not need to be considered, and the ash mass estimation accuracy is high and the deviation is small.
Description
Technical Field
The invention belongs to the technical field of diesel engines, and particularly relates to an estimation method and device for ash content mass of a diesel engine DPF, and electronic equipment.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
DPFs (Diesel Particulate filters) are increasingly used as essential components of Diesel engine vehicles.
The diesel engine runs and produces the granule, gets into DPF through the blast pipe, and DPF collects these granules together, and after the granule reaches certain limit value, can trigger the regeneration, and the combustible particle in the DPF is burnt out to the nozzle oil spout, remains incombustible granule, also called the ash content.
Since ash can accumulate in the DPF and affect the normal operation of the DPF, the quality of the ash in the DPF needs to be estimated and fed back to the relevant control unit of the diesel engine. At present, the mass of ash in the DPF is estimated through mileage, but abnormal conditions, such as engine oil burning and the like, can occur in the operation process of a diesel engine, so that the mass of the ash can be rapidly increased, and the estimation through the mileage can cause large deviation and has poor accuracy.
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 purpose is realized by the following technical scheme:
the first aspect of the invention provides a method for estimating the ash mass of a diesel engine DPF, which comprises the following steps:
when the DPF is completely regenerated, acquiring the exhaust gas flow in an exhaust pipe of the diesel engine under the operation working condition and a first pressure difference at two ends of the DPF;
acquiring a second pressure difference between two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow rate in the exhaust pipe;
and obtaining the ash mass accumulated when the DPF is completely regenerated according to the difference value of the first pressure difference and the second pressure difference.
According to the method, the exhaust gas flow in the exhaust pipe of the diesel engine under the operation working condition, the first pressure difference at two ends of the DPF and the second pressure difference at two ends of the DPF when the fresh DPF corresponds to the exhaust gas flow in the exhaust pipe are obtained, the ash mass accumulated when the regeneration of the DPF is completely finished is obtained according to the difference value of the second pressure difference and the first pressure difference, the method is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operation process does not need to be considered, and the ash mass estimation accuracy is high and the deviation is small.
In addition, the method for estimating the ash mass of the DPF of the diesel engine according to the present invention may further have the following additional technical features:
in some embodiments of the present invention, before obtaining the exhaust gas flow rate in the exhaust pipe and the first pressure differential across the DPF, further comprising:
determining a plausibility of measurements of a differential pressure sensor across the DPF;
and obtaining the first pressure difference according to the credible measured values of the pressure difference sensors at the two ends of the DPF.
In some embodiments of the invention, the estimation method further comprises:
determining whether the complete regeneration of the DPF is triggered by differential pressure according to the unreliability of the measured values of the differential pressure sensors at the two ends of the DPF;
obtaining the temperature and the regeneration mileage of the DPF during the thorough regeneration of the DPF according to the condition that the thorough regeneration of the DPF is triggered by pressure difference;
and obtaining the ash mass accumulated when the DPF is completely regenerated 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 comprises:
acquiring the ratio of the interval with the DPF temperature larger than a first preset value in the regeneration mileage;
and obtaining the ash mass accumulated when the DPF is completely regenerated 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 invention, the mass of ash accumulated by the DPF upon complete regeneration is inversely related to the regeneration mileage.
In some embodiments of the invention, determining the plausibility of the measurement values of the differential pressure sensor across the DPF comprises in particular:
and when the diesel engine is in the specified working condition, determining that the measured values of the differential pressure sensors at the two ends of the DPF are credible according to the fact that the display value of the differential pressure sensor is within the preset threshold value.
In some embodiments of the invention, determining whether complete regeneration of the DPF is a differential pressure trigger based on an uncertainty in measurements from a differential pressure sensor across the DPF further comprises:
obtaining the corrected ECU (Electronic Control Unit) mileage of the diesel engine according to the condition that the complete regeneration of the DPF is triggered by non-differential pressure;
and obtaining the accumulated ash mass of the DPF when the regeneration is completely finished according to the corrected ECU mileage.
In some embodiments of the invention, the mass of ash accumulated by the DPF when regeneration is completely completed is negatively correlated with the regeneration mileage by:
m-ks + b, where M is ash mass, s is regeneration mileage, K is coefficient, and b is constant.
A second aspect of the present invention provides an estimation device of DPF ash mass of a diesel engine, comprising:
the first acquisition unit is used for acquiring the exhaust gas flow in an exhaust pipe and a first pressure difference between two ends of the DPF under the operation working condition of the diesel engine when the DPF completely finishes regeneration; and
acquiring a second pressure difference between two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow rate in the exhaust pipe;
a first calculation unit for obtaining an ash mass accumulated when regeneration of the DPF is completely completed, from a difference value between the second differential pressure and the first differential pressure.
According to the estimation device, the first obtaining unit is used for obtaining the exhaust gas flow in the exhaust pipe of the diesel engine under the operation working condition, the first pressure difference at two ends of the DPF, and the second pressure difference at two ends of the DPF when the fresh DPF corresponds to the exhaust gas flow in the exhaust pipe, the first calculating unit is used for obtaining the ash mass accumulated when the regeneration of the DPF is completely completed according to the difference value of the second pressure difference and the first pressure difference, the estimation device is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operation process does not need to be considered, and the estimation accuracy of the ash mass is high, and the deviation is small.
A third aspect of the present invention provides an electronic device, comprising: one or more processors; and a memory on which is stored a program or instructions that can be run, which when executed by the estimation device, implement the steps of the estimation method of diesel DPF ash mass as described in the above embodiments.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically shows 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 present 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" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 2, a first aspect of an embodiment of the present invention provides a method for estimating ash mass of a DPF of a diesel engine, comprising:
when the DPF is completely regenerated, acquiring the exhaust gas flow in an exhaust pipe of the diesel engine under the operation working condition and a first pressure difference at two ends of the DPF;
the DPF regeneration can be determined to be completely finished when the regeneration time of the DPF reaches the preset time, and the preset time can be determined according to the time required by the DPF to completely finish 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 operates, the produced particles enter the DPF through the exhaust pipe, after the accumulated particles of the DPF reach a certain limit value, the system can trigger the regeneration of the DPF, and when the time length from the triggering of the regeneration reaches the preset time length, the DPF can be determined to be only left with ash. At this time, the exhaust gas flow rate in the exhaust pipe at the current moment and the first pressure difference between the two ends of the DPF can be recorded, and when the detection is performed, pressure difference sensors can be respectively arranged at the two ends of the air inlet end and the air outlet end of the DPF to measure the first pressure difference between the two ends of the DPF, wherein the first pressure difference is recorded as P 2 。
It is noted that when regeneration is deemed to be complete, the exhaust flow in the exhaust pipe and the first pressure differential across the DPF must be locked immediately to avoid the effect of newly generated particulates on the results.
Acquiring a second pressure difference between two ends of the DPF when the DPF is in a fresh state and corresponds to the exhaust gas flow in the exhaust pipe;
the fresh state is a state in which ash is not formed yet at the stage of development of the diesel engine after the post-treatment. The pretreated DPF state is calibrated to obtain P ═ A × V, wherein P is the pressure difference, A is the resistance coefficient of the carrier, V is the exhaust gas volume flow, and for a diesel engine with a specific specification, A is a fixed coefficient and is a parameter calibrated in advance. The exhaust pipe can be calculated by the formula P ═ A × VSecond pressure difference P corresponding to the exhaust gas flow in 3 。
According to a first pressure difference P 2 And a second pressure difference P 3 The difference in (c) yields the mass of ash accumulated by the DPF when regeneration is completely completed.
The difference is denoted by Δ P, which is P 2 -P 3 Mass M of ash accumulated in DPF upon complete regeneration 2 Is shown in which M is 2 Where A is the drag coefficient of the carrier and Δ P is the difference, determining the ash mass M according to the formula 2 。
By obtaining the exhaust gas flow in the exhaust pipe of the diesel engine under the operating condition and the first pressure difference P between two ends of the DPF 2 And a second pressure difference P across the DPF when the DPF is in a fresh state corresponding to the exhaust gas flow rate in the exhaust pipe 3 According to a first pressure difference P 2 And a second pressure difference P 3 The difference Δ P of (A) yields the mass M of ash accumulated by the DPF upon complete regeneration 2 The method is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operation process does not need 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 difference P across the DPF are obtained 2 Before, still include: determining the credibility of the measured values of the differential pressure sensor at the two ends of the DPF; obtaining a first pressure difference P according to the credibility of the measured values of the pressure difference sensors at the two ends of the DPF 2 This procedure allows the plausibility of the measured values of the differential pressure sensor to be recognized, so that the first differential pressure P measured by the differential pressure sensor is detected 2 Is accurate and reliable.
In particular, determining the plausibility of the measured values of the differential pressure sensor across the DPF comprises in particular: when the diesel engine is in the designated working condition, determining that the measured values of the differential pressure sensors at the two ends of the DPF are credible according to the fact that the display value of the differential pressure sensor is within the preset threshold value.
The preset threshold value is calibrated data, is pressure, adopts a range value, can be an interval of [ -2hPa, 2hPa ], and can also be [ -3hPa, 3hPa ], so as to eliminate errors caused by drift of the differential pressure sensor. The designated conditions herein include idle conditions and/or stop conditions, which are common conditions for diesel engines, where deployment is not performed.
In some optional embodiments, the estimation method further comprises: determining whether the DPF is completely regenerated and triggered by differential pressure according to the uncertainty of the measured values of the differential pressure sensors at the two ends of the DPF; obtaining the temperature and the regeneration mileage of the DPF during the thorough regeneration of the DPF by triggering the pressure difference according to the thorough regeneration of the DPF; and obtaining the accumulated ash mass of the DPF when the regeneration is completely finished according to the temperature of the DPF and the regeneration mileage.
Note that M is used as the ash mass obtained from DPF temperature and regeneration mileage 1 Marking, i.e. the ash mass M-M estimated by this method 1 To facilitate comparison with the previously mentioned estimated ash mass M 2 A distinction is made.
In some alternative embodiments, deriving the mass of ash accumulated by the DPF upon complete regeneration based on DPF temperature and regeneration mileage specifically includes: acquiring the ratio of the interval with the DPF temperature larger than a first preset value in the regeneration mileage; and obtaining the ash mass accumulated when the DPF is completely regenerated according to the interval to which the ratio belongs, the regeneration mileage and the corresponding ash curve compared with the interval.
The first preset value is a specific temperature value, and in practical selection, the first preset value may be 300 ℃, or 302 ℃, and the range to which the ratio belongs may be selected to be, for example, greater than 30%, or greater than 10% and less than 20%, or less than 10%, which will be discussed in detail below.
The mass of ash accumulated by a DPF upon complete regeneration is inversely related to the regeneration mileage. That is, the greater the regeneration mileage, the less the ash mass. The mass of ash accumulated when the regeneration of the DPF is completely finished and is negatively related to the regeneration mileage specifically is as follows: m is a group of 1 -K x s + b, wherein M 1 Is ash mass, s is regeneration mileage, K is coefficient, related to DPF carrier, and b is constant.
Wherein, when the interval to which the ratio belongs is more than 30%, K can be selected 1 K found from the regeneration mileage 1 It will be relatively small. When the range to which the ratio belongs is more than 10% and less than 20%, K can be selected 2 In which K is 2 Greater than K 1 . When the interval to which the ratio belongs is less than 10%, K can be selected 3 ，K 3 B is a fixed constant for the maximum of the three data. In a diesel engine product of a certain specification, K 1 、K 2 、K 3 Are fixed data and can be directly obtained from relevant parameters of the diesel engine, and the magnitude of the value is usually between 0.04 and 0.2.
K here can be dimensioned by the regeneration mileage and the corresponding ratio interval, so that M can be used 1 Calculating ash mass M from ═ K × s + b 1 。
In some alternative embodiments, determining whether the DPF is triggered by a differential pressure based on an uncertainty in a measurement of a differential pressure sensor across the DPF further comprises:
completely completing regeneration according to the DPF, and obtaining the corrected ECU mileage of the diesel engine as non-differential pressure triggering;
the mass of ash accumulated by the DPF upon complete regeneration is derived from the corrected ECU mileage.
The corrected ECU mileage refers to the ECU mileage corrected by at least one of a rotating speed correction factor, a circulating oil supply amount correction factor and a turbine rear exhaust pressure correction factor, and by means of the mode, the actual operation condition of the diesel engine can be considered, and compared with the unmodified ECU mileage in the prior art, the ash mass estimation is more accurate. Ash mass M obtained in this way 0 To indicate.
In order to show the flow of the method for estimating the ash mass of the DPF of the diesel engine more clearly, the following description is made in accordance with fig. 2, and the numbers are only for convenience of description and do not represent the sequence between the steps.
S21, determining that the DPF is completely regenerated; the determination criteria for complete regeneration of the DPF can be referred to the corresponding description in the above embodiments, and will not be described herein.
S22, when the diesel engine is in the designated working condition, determining whether the display value of the differential pressure sensor is within the preset threshold value; the designated working condition can be an idling 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 proved to be credible.
S23, determining whether the DPF is completely regenerated and triggered by the pressure difference according to the fact that the display value of the pressure difference sensor is not within the preset threshold value; at this time, it is judged whether the DPF complete regeneration is the differential pressure trigger, indicating that the value displayed by the differential pressure sensor is not authentic.
S24, completely finishing regeneration non-differential pressure triggering according to DPF, and outputting M-M 0 (ii) a This is one way to achieve an estimate of ash mass.
S25, according to the fact that the complete regeneration of the DPF is triggered by the pressure difference, the output M is M 1 (ii) a This is another way to achieve an estimate of ash mass.
S26, acquiring a first pressure difference at two ends of the DPF under the current flow according to the fact that the display value of the pressure difference sensor is within a preset threshold value; at this time, the display value of the differential pressure sensor is explained to be credible, and the first differential pressure at two ends of the DPF under the current flow can be obtained.
And 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 to be caused by the ash mass, so that the ash mass M can be determined from the difference and the current flow rate 2 。
S28, determining the ash mass M according to the difference and the current flow 2 (ii) a Wherein M is 2 A is the drag coefficient of the carrier, determining the ash mass M 2 。
S29, mass M of output ash being M 2 。
The above is a general description of the estimation method of the present invention, and details not mentioned therein can be found in the relevant description of the previous embodiments.
In some alternative embodiments, the method of estimating diesel DPF ash mass further comprises: and when the ash mass is greater than the limit value, a warning is sent out to remind a user of cleaning ash and maintaining.
A second aspect of an embodiment of the present invention provides an estimation device of DPF ash mass of a diesel engine, comprising:
the first acquisition unit is used for acquiring the exhaust gas flow in an exhaust pipe and a first pressure difference between two ends of the DPF under the operation working condition of the diesel engine when the DPF completely finishes regeneration; and acquiring a second pressure difference between two ends of the DPF when the DPF is in a fresh state and corresponds to the exhaust gas flow rate in the exhaust pipe;
and the first calculation unit is used for obtaining the ash mass accumulated when the regeneration of the DPF is completely finished according to the difference value of the second pressure difference and the first pressure difference.
According to the estimation device, the first obtaining unit is used for obtaining the exhaust gas flow in the exhaust pipe of the diesel engine under the operation working condition, the first pressure difference at two ends of the DPF, and the second pressure difference at two ends of the DPF when the fresh DPF corresponds to the exhaust gas flow in the exhaust pipe, the first calculating unit is used for obtaining the ash mass accumulated when the regeneration of the DPF is completely completed according to the difference value of the second pressure difference and the first pressure difference, the estimation device is not influenced by the specification of the diesel engine, the abnormal condition of the diesel engine in the operation process does not need to be considered, and the estimation accuracy of the ash mass is high, and the deviation is small.
In some optional embodiments, the estimation device further comprises: and the judging unit is used for determining whether the complete regeneration of the DPF is triggered by pressure difference according to whether the measured values of the pressure difference sensors at the two ends of the DPF are credible or not.
In some optional embodiments, the estimation device further comprises a second obtaining unit and a second calculating unit, wherein the second obtaining unit is used for obtaining the temperature and the regeneration mileage of the DPF during the complete regeneration of the DPF; the second calculating unit is used for obtaining the ash mass accumulated when the regeneration of the DPF is completely finished according to the temperature of the DPF and the regeneration mileage, and specifically, the second calculating unit is used for obtaining the ratio of an interval with the temperature of the DPF being greater than the first preset value in the regeneration mileage, and obtaining the ash mass accumulated when the regeneration is completely finished according to the interval to which the ratio belongs, the regeneration mileage and a corresponding ash curve compared with the interval.
In some optional embodiments, the estimation device further comprises a third calculation unit for deriving the mass of ash accumulated by the DPF at the time of complete regeneration from the corrected ECU mileage.
In some optional embodiments, the estimation device further comprises an alarm unit, wherein the alarm unit is used for sending out an alarm when the ash mass is greater than the limit value, so as to remind a user of ash removal maintenance.
For details not mentioned in the estimation apparatus, reference may be made to related embodiments of the estimation method, and further description is omitted here.
A third aspect of a specific embodiment of the present invention provides an electronic apparatus, including:
one or more processors; and a memory on which is stored a program or instructions that can be run, which when executed by the estimation device, implement the steps of the estimation method of diesel DPF ash mass as in the previous embodiments.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method of estimating DPF ash mass of a diesel engine, comprising:
when the DPF is completely regenerated, acquiring the exhaust gas flow in an exhaust pipe of the diesel engine under the operation working condition and a first pressure difference at two ends of the DPF;
acquiring a second pressure difference between two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow rate in the exhaust pipe;
and obtaining the ash mass accumulated when the DPF is completely regenerated according to the difference value of the first pressure difference and the second pressure difference.
2. The method of estimating DPF ash mass of a diesel engine as set forth in claim 1, further comprising, prior to obtaining the exhaust flow in the exhaust pipe and the first pressure differential across the DPF:
determining a plausibility of measurements of a differential pressure sensor across the DPF;
and obtaining the first pressure difference according to the credible measured values of the pressure difference sensors at the two ends of the DPF.
3. The method of estimating diesel DPF ash mass of claim 2, further comprising:
determining whether the complete regeneration of the DPF is triggered by differential pressure according to the unreliability of the measured values of the differential pressure sensors at the two ends of the DPF;
obtaining the temperature and the regeneration mileage of the DPF during the thorough regeneration of the DPF according to the condition that the thorough regeneration of the DPF is triggered by pressure difference;
and obtaining the ash mass accumulated when the DPF is completely regenerated according to the DPF temperature and the regeneration mileage.
4. The method of estimating DPF ash mass of a diesel engine according to claim 3, wherein deriving the ash mass accumulated when the DPF is completely regenerated based on the DPF temperature and the regeneration mileage specifically comprises:
acquiring the ratio of the interval with the DPF temperature larger than a first preset value in the regeneration mileage;
and obtaining the ash mass accumulated when the DPF is completely regenerated according to the interval to which the ratio belongs, the regeneration mileage and the corresponding ash curve which is compared with the interval.
5. The method of estimating DPF ash mass of a diesel engine according to claim 4, wherein the mass of ash accumulated in the DPF at the time of complete regeneration is inversely related to the regeneration mileage.
6. Method for estimation of the ash mass of a DPF of a diesel engine according to claim 2, characterized in that the determination of the plausibility of the measurement values of the differential pressure sensor across said DPF specifically comprises:
and when the diesel engine is in the specified working condition, determining that the measured values of the differential pressure sensors at the two ends of the DPF are credible according to the fact that the display value of the differential pressure sensor is within the preset threshold value.
7. The method of estimating DPF ash mass of a diesel engine as set forth in claim 3, wherein determining whether complete regeneration of the DPF is a differential pressure trigger based on an uncertainty in a measurement of a differential pressure sensor across the DPF further comprises:
obtaining the corrected ECU mileage of the diesel engine according to the condition that the complete regeneration of the DPF is triggered by non-differential pressure;
and obtaining the accumulated ash mass of the DPF when the regeneration is completely finished according to the corrected ECU mileage.
8. Method for estimation of the ash mass of a DPF of a diesel engine according to claim 5, characterized in that the mass of ash accumulated by the DPF when the regeneration is completely completed is negatively correlated with the regeneration mileage in particular:
m-ks + b, where M is ash mass, s is regeneration mileage, K is coefficient, and b is constant.
9. An estimation device of DPF ash mass of a diesel engine, comprising:
the first acquisition unit is used for acquiring the exhaust gas flow in an exhaust pipe and a first pressure difference between two ends of the DPF under the operation working condition of the diesel engine when the DPF completely finishes regeneration; and
acquiring a second pressure difference between two ends of the DPF in a fresh state when the DPF corresponds to the exhaust gas flow rate in the exhaust pipe;
a first calculation unit for obtaining an ash mass accumulated when regeneration of the DPF is completely completed, from a difference value between the second differential pressure and the first differential pressure.
10. An electronic device, comprising:
one or more processors; and
memory on which is stored a program or instructions that can be run, when executed by said estimation means, to implement the steps of the diesel DPF ash mass estimation method according to claim 1.
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