CN103775182A - Method and related device for calculating and verifying ash content of DPF (diesel particulate filter) of diesel engine - Google Patents
Method and related device for calculating and verifying ash content of DPF (diesel particulate filter) of diesel engine Download PDFInfo
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- 230000008929 regeneration Effects 0.000 claims abstract description 63
- 238000011069 regeneration method Methods 0.000 claims abstract description 63
- 239000007789 gas Substances 0.000 claims description 45
- 238000004088 simulation Methods 0.000 claims description 25
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- 239000002912 waste gas Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 description 9
- 239000000446 fuel Substances 0.000 description 6
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- 239000000295 fuel oil Substances 0.000 description 4
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- 238000002485 combustion reaction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
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- 239000010705 motor oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
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Abstract
The invention discloses a method for calculating the ash content of a DPF (diesel particulate filter) of a diesel engine to fulfill the aim of accurately calculating the ash content of the DPF of the diesel engine. The method comprises the following steps of pre-calibrating an ash content MAP image based on the temperature of the DPF and/or exhaust gas flow rate in an exhaust pipe, and difference of pressure of the two ends of the DPF; when regeneration is thoroughly finished by the DPF, acquiring the temperature of the DPF and/or the exhaust gas flow rate in the exhaust pipe, and the difference of pressure of the two ends of the DPF; according to the acquired temperature of the DPF and/or the exhaust gas flow rate in the exhaust pipe, and the difference of pressure of the two ends of the DPF, inquiring the ash content MAP image to obtain the accumulated ash content when regeneration is thoroughly finished by the DPF. The invention also discloses a device for calculating the ash content of the DPF of the diesel engine, and a method and a device for verifying the ash content of the DPF of the diesel engine.
Description
Technical Field
The invention relates to the field of electric control diesel engines, in particular to a method for calculating and verifying ash content of a diesel engine DPF and a related device.
Background
With the increasing tightening of PM requirements by internal combustion engine emission regulations, DPF (Diesel particulate filter) is becoming more and more widely used as a main component for PM reduction.
The method comprises the following steps that particles generated by operation of an engine of a diesel engine enter the DPF through an exhaust pipe, the DPF collects the particles together, regeneration is triggered after the particles reach a certain limit value, then the combustible particles in the DPF are burnt out through nozzle oil injection, and non-combustible particles, namely ash (ash), are left. Since ash is accumulated in the DPF and affects the normal operation of the DPF, the amount of ash in the DPF needs to be calculated and fed back to an associated control unit of the diesel engine. At present, the ash content in the DPF is mainly based on engine operating conditions such as engine oil consumption, fuel oil consumption and the like to simulate ash flow, and the ash flow is integrated to obtain the ash content accumulated in the DPF.
However, because of engines with different specifications and fuel with different specifications, the amount of ash left after combustion is different, and the amount of ash in the DPF obtained by performing simulation according to the operation condition of the engine is not accurate.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method for calculating and verifying ash content of a diesel DPF and a related device thereof, so as to achieve the purpose of accurately calculating the ash content in the diesel DPF and verifying whether the real-time simulated ash content is accurate.
In a first aspect of the embodiments of the present invention, a method for calculating an ash component of a DPF of a diesel engine is provided, including:
precalibrating an ash content MAP based on DPF temperature and/or exhaust gas flow in the exhaust pipe, and pressure differential across the DPF;
when the DPF is completely regenerated, collecting the temperature of the DPF and/or the flow rate of waste gas in an exhaust pipe, and the pressure difference between two ends of the DPF;
and inquiring the ash component MAP according to the collected temperature of the DPF and/or the flow rate of the exhaust gas in the exhaust pipe and the pressure difference between two ends of the DPF to obtain the accumulated ash content of the DPF when the regeneration is completely finished.
In a second aspect of the embodiments of the present invention, there is provided a device for calculating an amount of ash in a DPF, including:
a pre-calibration unit for pre-calibrating an ash content MAP based on DPF temperature and/or exhaust gas flow in the exhaust pipe, and a pressure difference across the DPF;
the collection unit is used for collecting the temperature of the DPF and/or the flow rate of waste gas in an exhaust pipe and the pressure difference between two ends of the DPF when the DPF is completely regenerated;
and the query unit is used for querying the ash component MAP according to the collected temperature of the DPF and/or the flow rate of the exhaust gas in the exhaust pipe and the pressure difference between two ends of the DPF to obtain the accumulated ash content of the DPF when the regeneration is completely finished.
In a third aspect of the embodiments of the present invention, a method for verifying an ash component of a DPF of a diesel engine is provided, including:
simulating the ash content of the DPF of the diesel engine in real time according to the running working condition of the engine of the diesel engine, and obtaining a first ash content accumulated in the DPF in real time;
obtaining a second ash component accumulated when the DPF completely finishes regeneration by applying the calculation method of the ash component of the DPF of the diesel engine;
and taking the second ash component as an accurate value, and verifying the accuracy of the first ash component obtained by real-time simulation when the DPF completely finishes regeneration.
In a fourth aspect of the embodiments of the present invention, there is provided a verification apparatus for ash content of a DPF of a diesel engine, including:
the simulation unit is used for simulating the ash content of the DPF of the diesel engine in real time according to the operation condition of the engine of the diesel engine to obtain a first ash content accumulated in the DPF in real time;
a calculation unit for applying the calculation method of the ash component of the DPF for the diesel engine as set forth in any one of claims 1 to 3 to obtain a second ash component accumulated when the regeneration of the DPF is completely completed;
and the checking unit is used for checking the accuracy of the first ash component obtained by real-time simulation when the regeneration of the DPF is completely finished by taking the second ash component as an accurate value.
Therefore, the invention has the following beneficial effects:
the embodiment of the present invention previously calibrates the ash amount MAP based on the DPF temperature and/or the exhaust gas flow rate in the exhaust pipe and the pressure difference across the DPF, according to the principle that the pressure difference across the DPF is affected by the exhaust gas flow rate and/or the DPF temperature, and the ash amount accumulated in the DPF, so that, when the DPF completely completes regeneration, the temperature of the DPF and/or the exhaust gas flow in the exhaust pipe and the pressure difference across the DPF can be collected, inquiring the ash component MAP according to the collected temperature of the DPF and/or the flow rate of exhaust gas in the exhaust pipe and the pressure difference between two ends of the DPF to obtain the accumulated ash content of the DPF when the regeneration is completely finished, since the embodiment of the present invention does not use the engine operation condition as a reference factor in calculating the ash amount, therefore, the calculated ash content is not influenced by a specific engine or specific fuel oil to the ash content, and the calculation result is more accurate;
in addition, the ash content of the DPF of the diesel engine is simulated in real time according to the operation condition of the engine of the diesel engine, the ash content accumulated in the DPF is obtained in real time, the calculation method of the ash content of the DPF of the diesel engine is applied, the second ash content accumulated when the regeneration of the DPF is completely finished is obtained, the second ash content is used as an accurate value, and the accuracy of the first ash content obtained in real time when the regeneration of the DPF is completely finished is verified, so that whether the ash content is accurate or not can be verified.
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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for calculating an ash content of a DPF of a diesel engine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a diesel engine aftertreatment device according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of an ash content calculation device of a DPF of a diesel engine provided by an embodiment of the invention;
FIG. 4 is a schematic flow chart of a method for verifying an ash component of a DPF of a diesel engine according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a device for verifying ash content of a DPF of a diesel engine according to an embodiment of the present invention.
Detailed Description
Because the ash content left by combustion is different for engines with different specifications and fuel oil with different specifications, the ash content in the DPF obtained by simulation according to the operation condition of the engine in the prior art is not accurate.
To solve this problem, the embodiment of the present invention uses the current DPF temperature and/or exhaust gas flow rate and DPF differential pressure to reversely derive the current ash component after the DPF is completely regenerated, according to the principle that the differential pressure across the DPF is affected by the exhaust gas flow rate and/or DPF temperature and the ash component accumulated in the DPF, and thus, the calculation result is more accurate without being affected by the ash component of a specific engine or a specific fuel.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, a flowchart of a method for calculating an ash component of a DPF of a diesel engine according to an embodiment of the present invention is provided. As shown in fig. 1, this embodiment may include:
s110, calibrating an ash content MAP graph based on DPF temperature and/or exhaust gas flow in an exhaust pipe and pressure difference between two ends of a DPF in advance;
for example, values of the DPF temperature, the pressure difference across the DPF, and the exhaust gas flow rate may be acquired in advance for various known ash amounts, and an ash amount MAP based on the DPF temperature and the pressure difference across the DPF may be calibrated in advance, or an ash amount MAP based on the exhaust gas flow rate in the exhaust pipe, the DPF temperature, and the pressure difference across the DPF may be calibrated in advance.
S120, when the DPF is completely regenerated, collecting the temperature of the DPF and/or the flow rate of waste gas in an exhaust pipe and the pressure difference between two ends of the DPF;
for example, it may be determined that the DPF is completely regenerated when the DPF regeneration period reaches a preset period. Wherein the preset duration may be determined according to a duration required for the DPF to completely complete regeneration. For example, the preset time period may be 30 minutes. When the engine runs, generated particles enter the DPF through the exhaust pipe, when the accumulated particles of the DPF reach a certain limit value, the system can trigger the regeneration of the DPF, when the time length from the triggering of the regeneration reaches a preset time length, carbon particles in the DPF, HC compounds coated on the outer layer and the like which can be oxidized and combusted are considered to be burnt, and the DPF only approximately leaves ash. At this time, the DPF temperature and/or the exhaust gas flow rate in the exhaust pipe and the differential pressure across the DPF at the present time may be recorded. When it is considered that the regeneration is completely completed, the DPF temperature and/or the exhaust gas flow rate in the exhaust pipe and the pressure difference between both ends of the DPF at the present time must be immediately locked to avoid the influence of newly generated particulates on the result.
For example, as shown in fig. 2, the diesel engine post-processing device includes a DPF, a differential pressure sensor may be respectively disposed at two ends of an inlet end and an outlet end of the DPF to measure a differential pressure at the two ends of the DPF, a temperature sensor may be disposed downstream of the DPF to measure a temperature of the DPF, an inlet flow sensor may be disposed at an inlet end of the engine to measure an inlet flow, and an exhaust flow may be obtained by correcting and calculating in consideration of injected fuel; or the exhaust gas flow can be obtained by carrying out MAP calibration through the rotating speed and the fuel injection quantity of the engine. Specifically, the temperature of the DPF can be acquired by a DPF downstream temperature sensor 201 as shown in fig. 2; the differential pressure across the DPF may be collected by differential pressure sensors 202 and 203 as shown in FIG. 2.
And S130, inquiring the ash component MAP according to the collected temperature of the DPF and/or the flow rate of the exhaust gas in the exhaust pipe and the pressure difference between two ends of the DPF to obtain the accumulated ash content of the DPF when the regeneration is completely finished.
For example, in one possible implementation, if an ash component MAP is calibrated in advance based on the pressure difference between the two ends of the DPF and the DPF temperature, the collected pressure difference between the two ends of the DPF and the DPF temperature may be used as query conditions, a basic ash component of the DPF when the regeneration is completely completed is found from the ash component MAP, and the basic ash component is corrected by using a correction coefficient corresponding to the collected exhaust gas flow rate, so as to obtain an ash component accumulated when the regeneration of the DPF is completely completed;
or,
in another possible implementation manner, if an ash component MAP is calibrated in advance based on the pressure difference between the two ends of the DPF and the exhaust gas flow rate in the exhaust pipe, the collected pressure difference between the two ends of the DPF and the collected exhaust gas flow rate can be used as query conditions, a basic ash component of the DPF when the regeneration is completely completed can be found from the ash component MAP, and the basic ash component can be corrected by using a correction coefficient corresponding to the collected DPF temperature, so that the ash component accumulated when the regeneration of the DPF is completely completed can be obtained.
Of course, there are other possible implementations, and the invention is not limited thereto.
Therefore, by applying the method for calculating the ash component of the diesel engine DPF provided by the embodiment of the invention, the ash component MAP is inquired according to the collected temperature of the DPF and/or the exhaust gas flow in the exhaust pipe and the pressure difference between two ends of the DPF to obtain the ash component accumulated when the regeneration of the DPF is completely finished, so that the calculated ash component is not influenced by the ash component of a specific engine or specific fuel oil, and the calculation result is more accurate.
In addition, the embodiment of the invention also provides a device for calculating the ash content of the DPF of the diesel engine. For example, see fig. 3 for a schematic diagram of a device for calculating the amount of ash in a DPF. As shown, the apparatus may include:
a pre-calibration unit 310, which may be used to pre-calibrate an ash content MAP based on DPF temperature and/or exhaust gas flow in the exhaust pipe, and pressure difference across the DPF;
for example, values of the DPF temperature, the pressure difference across the DPF, and the exhaust gas flow rate may be acquired in advance for various known ash amounts, and an ash amount MAP based on the DPF temperature and the pressure difference across the DPF may be calibrated in advance, or an ash amount MAP based on the exhaust gas flow rate in the exhaust pipe, the DPF temperature, and the pressure difference across the DPF may be calibrated in advance.
The collection unit 320 can be used for collecting the temperature of the DPF and/or the flow rate of exhaust gas in the exhaust pipe and the pressure difference between two ends of the DPF when the DPF is completely regenerated;
for example, the apparatus may further include a judging unit 321, which may be configured to determine that the DPF is completely regenerated when the DPF regeneration time period reaches a preset time period. Wherein the preset duration may be determined according to a duration required for the DPF to completely complete regeneration. For example, the preset time period may be 30 minutes. When the regeneration time from the DPF activation reaches a preset time, it is considered that carbon particles in the DPF and HC compounds and the like coated on the outer layer, which can be oxidized and burned, have been burned off, and the DPF is approximately left with only ash. At this time, the DPF temperature, the differential pressure across the DPF, and the exhaust gas flow rate in the exhaust pipe at the present time may be recorded.
For example, as shown in fig. 2, the diesel engine post-treatment device includes a DPF, a differential pressure sensor may be provided at both ends of an inlet end and an outlet end of the DPF to measure a differential pressure between both ends of the DPF, a temperature sensor may be provided downstream of the DPF to measure a temperature of the DPF, and an inlet flow sensor may be provided at an inlet end of an engine exhaust pipe to measure an exhaust gas flow rate in the exhaust pipe. Specifically, the temperature of the DPF can be acquired by a DPF downstream temperature sensor 201 as shown in fig. 2; the differential pressure across the DPF may be collected by differential pressure sensors 202 and 203 as shown in FIG. 2; the exhaust gas flow in the exhaust pipe can be collected by arranging an air inlet flow sensor at the air inlet end of the engine to measure the air inlet flow, and then correcting and calculating by considering the injected fuel to obtain the exhaust gas flow; or the exhaust gas flow can be obtained by carrying out MAP calibration through the rotating speed and the fuel injection quantity of the engine.
The query unit 330 may be configured to query the ash content MAP according to the collected temperature of the DPF and/or the exhaust gas flow rate in the exhaust pipe, and the pressure difference between two ends of the DPF, so as to obtain the ash content accumulated when the regeneration of the DPF is completely completed.
For example, the query unit 330 may include:
a first query subunit 331, configured to, if the pre-calibration unit 310 calibrates an ash component MAP in advance based on a pressure difference across the DPF and a temperature of the DPF, take the pressure difference across the DPF and the temperature of the DPF collected by the collection unit 320 as query conditions, and find out a basic ash component of the DPF when regeneration of the DPF is completely completed from the ash component MAP; the first correcting subunit 332 may be configured to correct the basic ash component found by the first querying subunit 331 by using a correction coefficient corresponding to the flow rate of the exhaust gas collected by the collecting unit 320, so as to obtain an ash component accumulated when the regeneration of the DPF is completely completed;
or,
a second searching subunit 333, configured to, if the pre-calibration unit 310 calibrates an ash component MAP in advance based on the pressure difference across the DPF and the exhaust gas flow rate in the exhaust pipe, search out, from the ash component MAP, a basic ash component of the DPF when regeneration is completely completed, using the pressure difference across the DPF and the exhaust gas flow rate collected by the collecting unit 320 as search conditions; the second correcting subunit 334 is configured to correct the basic ash component found by the second querying subunit 333 by using a correction coefficient corresponding to the DPF temperature collected by the collecting unit 320, so as to obtain an ash component accumulated when the regeneration of the DPF is completely completed.
The method for calculating the ash component of the DPF of the diesel engine according to the embodiment can only calculate the ash component accumulated in the DPF when the regeneration of the DPF is completely completed, so that in another embodiment of the invention, a scheme for simulating the ash component of the DPF of the diesel engine in real time according to the operating condition of the engine of the diesel engine is combined to obtain the ash component accumulated in the DPF in real time, a second ash component accumulated when the regeneration of the DPF is completely completed is obtained by applying the method for calculating the ash component of the DPF of the diesel engine, and the accuracy of the first ash component obtained by real-time simulation when the regeneration of the DPF is completely completed is verified by taking the second ash component as an accurate value. Specifically, for example, referring to fig. 4, a flowchart of a method for verifying an ash component of a DPF of a diesel engine according to an embodiment of the present invention is provided. As shown in fig. 4, this embodiment may include:
s410, simulating the ash content of the DPF of the diesel engine in real time according to the running working condition of the engine of the diesel engine, and obtaining a first ash content accumulated in the DPF in real time;
s420, applying the method for calculating the ash component of the DPF of the diesel engine to obtain a second ash component accumulated when the DPF completely completes regeneration;
and S430, taking the second ash component as an accurate value, and verifying the accuracy of the first ash component obtained by real-time simulation when the regeneration of the DPF is completely finished.
For example, in one possible implementation, the absolute value of the difference between the first ash component and the second ash component obtained by real-time simulation when the DPF completely completes regeneration may be calculated; calculating a ratio of the absolute value to the first ash amount; and determining a checking result by judging whether the ratio exceeds a preset threshold value. The preset threshold may be obtained according to experiments, and may be, for example, 50%. After the verification result is determined, error information can be further fed back according to the verification result. For example, if the ratio does not exceed a preset threshold, it may be determined that the verification result is correct, and if the ratio exceeds the threshold, it may be determined that the verification result is inaccurate.
Or, for another example, in another possible implementation manner, a difference between the second component and the first component may be calculated, and if the difference exceeds a preset threshold, it may be determined that the verification result is that the real-time simulation result is inaccurate. Of course, there may be other possible verification methods, and the present invention is not limited thereto.
And under the condition that the real-time simulation result is inaccurate, error information can be further fed back to a Fault checking and diagnosing system (DFC) to send out a Fault alarm, or real-time simulation Fault recovery processing can be further carried out according to the error information.
Therefore, by applying the method for verifying the ash component of the DPF of the diesel engine provided by the embodiment of the invention, the accuracy of the first ash component obtained in real time when the DPF completely completes regeneration can be verified, so that the ash component accumulated in the DPF can be calculated in real time, and whether the ash component obtained by real-time simulation is accurate or not can be verified.
Corresponding to the method for verifying the ash content of the DPF of the diesel engine, the embodiment of the invention also provides a device for verifying the ash content of the DPF of the diesel engine. For example, see fig. 5 for a schematic diagram of a device for verifying the ash content in a DPF. As shown, the apparatus may include:
the simulation unit 510 may be configured to perform real-time simulation on the ash content of the DPF of the diesel engine according to an operation condition of an engine of the diesel engine, so as to obtain a first ash content accumulated in the DPF in real time;
a calculating unit 520, which can be used to apply the above-mentioned method for calculating the ash component of the DPF of the diesel engine to obtain a second ash component accumulated when the regeneration of the DPF is completely completed;
the verifying unit 530 may be configured to verify the accuracy of the first ash component obtained by real-time simulation when the DPF completely completes regeneration, with the second ash component as an accurate value.
For example, in one possible implementation, the verification unit 530 may include:
the first calculating subunit 531 may be configured to calculate an absolute value of a difference between the first ash component and the second ash component obtained through real-time simulation when the DPF completely completes regeneration;
a second calculating subunit 532, which may be configured to calculate a ratio of the absolute value calculated by the first calculating subunit to the first ash amount;
the determining unit 533 may be configured to determine the verification result by determining whether the ratio calculated by the second calculating subunit exceeds a preset threshold.
The preset threshold may be obtained according to experiments, and may be, for example, 50%. After the verification result is determined, error information can be further fed back according to the verification result. For example, if the ratio does not exceed a preset threshold, it may be determined that the verification result is correct, and if the ratio exceeds the threshold, it may be determined that the verification result is inaccurate.
Or, for another example, in another possible implementation manner, a difference between the second component and the first component may be calculated, and if the difference exceeds a preset threshold, it may be determined that the verification result is that the real-time simulation result is inaccurate. Of course, there may be other possible verification methods, and the present invention is not limited thereto.
And under the condition that the real-time simulation result is inaccurate, error information can be further fed back to a Fault checking and diagnosing system (DFC) to send out a Fault alarm, or real-time simulation Fault recovery processing can be further carried out according to the error information.
It is noted that the first querying sub-unit 331, the second correcting sub-unit 332, the second querying sub-unit 333 and the second correcting sub-unit 334 are drawn by dotted lines in fig. 3, and the first calculating sub-unit 531, the second calculating sub-unit 532 and the judging unit 533 are drawn by dotted lines in fig. 5, so as to indicate that these sub-units are not essential units of the apparatus of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A method of calculating an ash component of a DPF of a diesel engine, comprising:
precalibrating an ash content MAP based on DPF temperature and/or exhaust gas flow in the exhaust pipe, and pressure differential across the DPF;
when the DPF is completely regenerated, collecting the temperature of the DPF and/or the flow rate of waste gas in an exhaust pipe, and the pressure difference between two ends of the DPF;
and inquiring the ash component MAP according to the collected temperature of the DPF and/or the flow rate of the exhaust gas in the exhaust pipe and the pressure difference between two ends of the DPF to obtain the accumulated ash content of the DPF when the regeneration is completely finished.
2. The method of claim 1, wherein said querying the ash MAP based on the collected temperature of the DPF and/or the exhaust gas flow rate in the exhaust pipe, and the pressure difference across the DPF, and wherein obtaining the ash content accumulated when the regeneration of the DPF is completely completed comprises:
if an ash component MAP is calibrated in advance based on the pressure difference between two ends of the DPF and the temperature of the DPF, taking the collected pressure difference between two ends of the DPF and the temperature of the DPF as query conditions, finding out a basic ash component of the DPF when the regeneration of the DPF is completely finished from the ash component MAP, and correcting the basic ash component by using a correction coefficient corresponding to the collected exhaust gas flow to obtain the ash component accumulated when the regeneration of the DPF is completely finished;
and if an ash component MAP is calibrated in advance based on the pressure difference between two ends of the DPF and the exhaust gas flow in the exhaust pipe, taking the collected pressure difference between two ends of the DPF and the exhaust gas flow as query conditions, finding out the basic ash component of the DPF when the regeneration is completely finished from the ash component MAP, and correcting the basic ash component by using a correction coefficient corresponding to the collected temperature of the DPF to obtain the ash component accumulated when the regeneration of the DPF is completely finished.
3. The method of claim 1, further comprising:
and when the regeneration time of the DPF reaches the preset time, determining that the DPF completely completes regeneration.
4. An apparatus for calculating an amount of ash in a DPF, comprising:
a pre-calibration unit for pre-calibrating an ash content MAP based on DPF temperature and/or exhaust gas flow in the exhaust pipe, and a pressure difference across the DPF;
the collection unit is used for collecting the temperature of the DPF and/or the flow rate of waste gas in an exhaust pipe and the pressure difference between two ends of the DPF when the DPF is completely regenerated;
and the query unit is used for querying the ash component MAP according to the collected temperature of the DPF and/or the flow rate of the exhaust gas in the exhaust pipe and the pressure difference between two ends of the DPF to obtain the accumulated ash content of the DPF when the regeneration is completely finished.
5. The apparatus of claim 4, wherein the query unit comprises:
the first query subunit is used for taking the pressure difference at two ends of the DPF and the temperature of the DPF, which are acquired by the acquisition unit, as query conditions if the pre-calibration unit calibrates an ash component MAP graph in advance based on the pressure difference at two ends of the DPF and the temperature of the DPF, and finding out a basic ash component when the regeneration of the DPF is completely finished from the ash component MAP graph; the first correcting subunit is used for correcting the basic ash component found by the first inquiring subunit by using a correction coefficient corresponding to the flow rate of the exhaust gas collected by the collecting unit to obtain the ash component accumulated when the regeneration of the DPF is completely finished;
or,
the second query subunit is used for taking the pressure difference at the two ends of the DPF and the exhaust gas flow rate acquired by the acquisition unit as query conditions and finding out the basic ash component of the DPF when the regeneration of the DPF is completely finished from the ash component MAP if the pre-calibration unit calibrates the ash component MAP in advance based on the pressure difference at the two ends of the DPF and the exhaust gas flow rate in the exhaust pipe; and the second correction subunit is used for correcting the basic ash component found by the second inquiry subunit by using the correction coefficient corresponding to the DPF temperature collected by the collection unit to obtain the ash component accumulated when the regeneration of the DPF is completely finished.
6. The apparatus of claim 4, further comprising:
and the judging unit is used for determining that the DPF completely finishes regeneration when the regeneration time of the DPF reaches the preset time.
7. A method for verifying an ash component of a DPF of a diesel engine, comprising:
simulating the ash content of the DPF of the diesel engine in real time according to the running working condition of the engine of the diesel engine, and obtaining a first ash content accumulated in the DPF in real time;
applying the method of calculating the ash component of a diesel DPF as defined in any of claims 1 to 3, obtaining a second ash component accumulated when the DPF is completely regenerated;
and taking the second ash component as an accurate value, and verifying the accuracy of the first ash component obtained by real-time simulation when the DPF completely finishes regeneration.
8. The method of claim 7, wherein verifying the accuracy of the first ash component obtained from the real-time simulation of the DPF when regeneration is completely completed with the second ash component as an accurate value comprises:
calculating the absolute value of the difference value between the first ash component and the second ash component obtained by real-time simulation when the DPF completely finishes regeneration;
calculating a ratio of the absolute value to the first ash amount;
and determining a checking result by judging whether the ratio exceeds a preset threshold value.
9. A calibration device for ash content of a diesel DPF is characterized by comprising:
the simulation unit is used for simulating the ash content of the DPF of the diesel engine in real time according to the operation condition of the engine of the diesel engine to obtain a first ash content accumulated in the DPF in real time;
a calculation unit for applying the calculation method of the ash component of the DPF for the diesel engine as set forth in any one of claims 1 to 3 to obtain a second ash component accumulated when the regeneration of the DPF is completely completed;
and the checking unit is used for checking the accuracy of the first ash component obtained by real-time simulation when the regeneration of the DPF is completely finished by taking the second ash component as an accurate value.
10. The apparatus of claim 9, wherein the verification unit comprises:
the first calculation subunit is used for calculating the absolute value of the difference value between the first ash component and the second ash component obtained by real-time simulation when the DPF completely finishes regeneration;
a second calculating subunit configured to calculate a ratio of the absolute value calculated by the first calculating subunit to the first ash amount;
and the judging unit is used for determining the checking result by judging whether the ratio calculated by the second calculating subunit exceeds a preset threshold value.
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