CN115355078B - DOC SOF deposition amount calculation and diagnosis method - Google Patents
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- CN115355078B CN115355078B CN202211113975.6A CN202211113975A CN115355078B CN 115355078 B CN115355078 B CN 115355078B CN 202211113975 A CN202211113975 A CN 202211113975A CN 115355078 B CN115355078 B CN 115355078B
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- 230000008021 deposition Effects 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000003745 diagnosis Methods 0.000 title claims abstract description 22
- 238000001179 sorption measurement Methods 0.000 claims abstract description 49
- 230000001052 transient effect Effects 0.000 claims abstract description 48
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims description 69
- 238000012937 correction Methods 0.000 claims description 31
- 230000008929 regeneration Effects 0.000 claims description 22
- 238000011069 regeneration method Methods 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 238000000197 pyrolysis Methods 0.000 claims description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 231100000572 poisoning Toxicity 0.000 claims description 3
- 230000000607 poisoning effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000004071 soot 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a DOC SOF deposition amount calculation and diagnosis method, which determines SOF original emission rate according to the rotation speed, torque, steady-state excess air coefficient and steady-state excess air coefficient/transient excess air coefficient of an engine; determining the adsorption rate of the DOC to the SOF according to the exhaust temperature, the exhaust gas flow and the last SOF deposition amount of the engine; determining the removal rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow of the engine; determining the SOF deposition rate according to the SOF original emission rate, the DOC adsorption rate to the SOF and the DOC removal rate to the SOF; determining the SOF deposition amount according to the SOF deposition rate; and performing fault diagnosis of the DOC and DOC performance recovery treatment. The deposition amount of SOF on the DOC can be obtained in time, so that the SOF on the DOC can be actively cleared when the deposition amount of SOF on the DOC is excessive.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a SOF deposition amount calculation and diagnosis method of a DOC.
Background
The exhaust gas of a diesel engine contains a large amount of harmful substances such as SOF (Soluble Organic Fraction, soluble organic substances), nitrogen oxides, and Soot. To remove these harmful substances, DOC (Diesel Oxidation Catalyst, oxidation catalyst), DPF (Diesel Particulate Filter, particulate trap) and SCR (Selective Catalytic Reduction ) are provided in the engine aftertreatment system. Because the running temperature of the national light vehicle is low, the solid SOF cannot be completely pyrolyzed, the SOF which is deposited on the surface of the DOC can be gradually accumulated to cover the surface of the DOC, and the SOF deposited on the surface of the DOC can isolate NO and HC in the exhaust gas from contacting with the DOC catalyst, so that the NO of the DOC 2 The conversion and HC oxidation performance is greatly reduced, and finally the active and passive regeneration failure of the DPF is caused, and even the NOx conversion efficiency of SCR is affected. However, there is no method in the prior art that can calculate the SOF deposition amount on the DOC to actively advance when the SOF deposition amount on the DOC is excessiveAnd the cleaning is performed, so that the failure of active and passive regeneration of the DPF caused by excessive SOF deposition on the DOC is prevented, and the NOx conversion efficiency of SCR is even influenced.
Disclosure of Invention
The invention aims to provide a method for calculating and diagnosing SOF deposition amount of a DOC, which solves the problem that no method in the prior art can calculate the SOF deposition amount on the DOC so as to actively remove the SOF deposition amount on the DOC when the SOF deposition amount is excessive.
To achieve the purpose, the invention adopts the following technical scheme:
the DOC SOF deposition amount calculation and diagnosis method comprises the following steps:
s1: determining an SOF original emission rate according to the rotating speed, the torque, the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient of the engine;
s2: determining the adsorption rate of the DOC to the SOF according to the exhaust temperature, the exhaust gas flow and the last SOF deposition amount of the engine;
s3: determining the removal rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow of the engine;
s4: determining a SOF deposition rate according to the SOF original emission rate, the DOC adsorption rate to SOF and the DOC removal rate to SOF;
s5: determining SOF deposition amount according to the SOF deposition rate;
s6: and performing fault diagnosis of the DOC and DOC performance recovery treatment.
As a preferred embodiment of the above method for calculating and diagnosing the SOF deposit amount of the DOC, determining the SOF raw emission rate according to the rotation speed, the torque, the steady-state excess air ratio and the steady-state excess air ratio/transient excess air ratio of the engine includes:
determining a first solid SOF emission rate through a first calculation mode based on a rotational speed, torque, steady state excess air factor, and steady state excess air factor/transient excess air factor of the engine;
determining a second solid SOF emission rate through a second calculation mode based on the rotational speed, torque, steady state excess air factor, and steady state excess air factor/transient excess air factor of the engine;
the first solid SOF emission rate, the second solid SOF emission rate, or a maximum of both the first solid SOF emission rate and the second solid SOF emission rate is selected as an SOF raw emission rate based on a rotational speed and torque of the engine.
As a preferred embodiment of the above method for calculating and diagnosing the SOF deposit amount of the DOC, determining the first solid SOF emission rate according to the rotation speed, the torque, the steady-state excess air ratio, and the steady-state excess air ratio/transient excess air ratio of the engine by the first calculation mode includes:
according to the rotating speed and torque of the engine, determining a steady-state emission rate coefficient of the gaseous HC through a steady-state emission Map of the gaseous HC;
determining a transient correction coefficient according to the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient through a transient correction coefficient Map;
multiplying the steady-state emission rate coefficient of the gaseous HC by the transient correction coefficient to obtain the original emission rate of the gaseous HC;
based on an approximately linear relationship of gaseous HC and solid SOF emissions, a first solid SOF emission rate is determined based on the gaseous HC raw emission rate.
As a preferred embodiment of the above method for calculating and diagnosing the SOF deposit amount of the DOC, determining the second solid SOF emission rate according to the rotation speed, the torque, the steady-state excess air ratio, and the steady-state excess air ratio/transient excess air ratio of the engine by the second calculation mode includes:
according to the rotation speed and torque of the engine, determining a solid SOF steady-state emission rate coefficient through a solid SOF steady-state emission Map;
determining a transient correction coefficient according to the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient through a transient correction coefficient Map;
and multiplying the steady-state solid SOF emission rate coefficient by the transient correction coefficient to obtain a second solid SOF emission rate.
As a preferable mode of the above-described method for calculating and diagnosing the SOF deposit amount of the DOC, selecting the first solid SOF emission rate, the second solid SOF emission rate, or the maximum value of both the first solid SOF emission rate and the second solid SOF emission rate as the SOF raw emission rate according to the rotation speed and torque of the engine includes:
judging whether the rotating speed of the engine is larger than the set rotating speed and whether the torque is larger than the set torque;
if the rotational speed of the engine is not greater than the set rotational speed and the torque is not greater than the set torque, selecting the first solid SOF emission rate as the SOF raw emission rate;
if the rotational speed of the engine is greater than the set rotational speed and the torque is greater than the set torque, selecting the second solid SOF emission rate as the SOF raw emission rate;
if the rotational speed of the engine is not greater than the set rotational speed and the torque is greater than the set torque, or the rotational speed is greater than the set rotational speed and the torque is not greater than the set torque, then the maximum value of both the first solid SOF emission rate and the second solid SOF emission rate is selected as the SOF raw emission rate.
As a preferable mode of the above-mentioned method for calculating and diagnosing the SOF deposit amount of the DOC, determining the rate of adsorption of the SOF by the DOC based on the exhaust temperature of the engine, the exhaust flow rate, and the last SOF deposit amount includes:
determining an SOF adsorption rate coefficient according to the exhaust temperature and the exhaust gas flow of the engine through an SOF adsorption rate Map;
according to the last SOF deposition amount, correcting CUR through the adsorption rate, and determining an adsorption rate correction coefficient;
and multiplying the SOF adsorption rate coefficient by the adsorption rate correction coefficient to obtain the adsorption rate of the DOC on the SOF.
As a preferable mode of the method for calculating and diagnosing the SOF deposit amount of the DOC, determining the rate of DOC for removing the SOF according to the exhaust temperature and the exhaust flow of the engine includes:
determining the passive regeneration rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow through the passive regeneration rate Map of the DOC to the SOF;
determining the pyrolysis rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow through the pyrolysis rate Map of the DOC to the SOF;
and the DOC is added with the passive regeneration rate of the SOF and the pyrolysis rate of the DOC to the SOF to obtain the removal rate of the DOC to the SOF.
As a preferred embodiment of the above method for calculating and diagnosing the amount of SOF deposit of the DOC, determining the rate of SOF deposit based on the rate of original SOF emission, the rate of adsorption of SOF by the DOC, and the rate of removal of SOF by the DOC includes:
and subtracting the DOC removal rate from the SOF original emission rate multiplied by the DOC adsorption rate to SOF to obtain the SOF deposition rate.
As a preferable mode of the above-described method for calculating and diagnosing the SOF deposit amount of the DOC, determining the SOF deposit amount according to the SOF deposit rate includes:
and integrating the SOF deposition rate within a set time to obtain the SOF deposition amount.
As a preferable mode of the method for calculating and diagnosing the SOF deposit amount of the DOC, the performing of the DOC fault diagnosis and the DOC performance recovery process includes:
s61: judging whether the conversion efficiency of the DOC to HC is reduced or not;
if yes, judging whether the SOF deposition amount is larger than a set SOF deposition amount;
if the SOF deposition amount is greater than the set SOF deposition amount, S62 is performed;
if the SOF deposition amount is not greater than the set SOF deposition amount, S64 is performed;
s62: DOC performs 300 ℃ thermal management;
s63: judging whether the conversion efficiency of the DOC to HC is recovered or not;
if yes, judging that the DOC fault is an SOF coverage fault;
if not, S64 is performed;
s64: DOC thermal management at 600 ℃;
s65: judging whether the conversion efficiency of the DOC to HC is recovered or not;
if yes, judging that the DOC fault is sulfur poisoning;
if not, judging that the DOC fault is DOC aging.
The invention has the beneficial effects that:
the invention aims to provide a method for calculating and diagnosing SOF deposition of a DOC, which is used for determining an original SOF emission rate according to the rotating speed, torque, steady-state excess air coefficient and steady-state excess air coefficient/transient excess air coefficient of an engine; determining the adsorption rate of the DOC to the SOF according to the exhaust temperature, the exhaust gas flow and the last SOF deposition amount of the engine; determining the removal rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow of the engine; determining the SOF deposition rate according to the SOF original emission rate, the DOC adsorption rate to the SOF and the DOC removal rate to the SOF; based on the SOF deposition rate, an amount of SOF deposition is determined. The SOF original emission rate, the DOC adsorption rate and the DOC SOF removal rate are obtained through calculation, the SOF deposition rate is obtained according to the SOF original emission rate, the DOC adsorption rate and the DOC SOF removal rate, and finally the SOF deposition amount is obtained according to the SOF deposition rate. The deposition amount of SOF on the DOC can be obtained in time, so that the SOF on the DOC can be actively cleared when the deposition amount of SOF on the DOC is excessive, and the failure of active and passive regeneration of the DPF caused by the excessive deposition amount of SOF on the DOC can be prevented, and even the NOx conversion efficiency of the SCR can be influenced. And when the conversion efficiency of the DOC to HC is reduced, fault diagnosis of the DOC and recovery treatment of the DOC performance are timely carried out so as to recover the DOC performance. By performing fault diagnosis and DOC performance recovery treatment of the DOC, the performance of the DOC is not affected, so that DPF regeneration and SCR conversion efficiency are not affected, the regeneration oil consumption can be reduced, the regeneration period is prolonged, and the use cost of a user is reduced.
Drawings
FIG. 1 is a flow chart of a method for SOF deposit quantity calculation and diagnosis of a DOC provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of SOF deposition calculation and diagnosis method for DOC according to the present invention;
FIG. 3 is a schematic diagram of SOF raw emission rate calculated by the DOC SOF deposition amount calculation and diagnosis method according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of calculating the adsorption rate of DOC to SOF in the method for calculating and diagnosing SOF deposition amount of DOC according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of calculating the SOF removal rate of DOC in the DOC SOF deposition amount calculation and diagnosis method according to the embodiment of the present invention;
fig. 6 is a flowchart of DOC fault diagnosis and DOC performance recovery processing performed in the method for calculating and diagnosing SOF deposit amount of DOC according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The invention provides a DOC SOF deposition amount calculation and diagnosis method, which comprises the following steps:
s1: the SOF raw emission rate is determined based on the rotational speed, torque, steady state excess air ratio, and steady state excess air ratio/transient excess air ratio of the engine.
A first solid SOF emission rate is determined by a first calculation mode based on a rotational speed, torque, steady state excess air ratio, and steady state excess air ratio/transient excess air ratio of the engine.
Specifically, according to the rotation speed and torque of the engine, determining a steady-state emission rate coefficient of the gaseous HC through a steady-state emission Map of the gaseous HC; determining a transient correction coefficient according to the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient through a transient correction coefficient Map; multiplying the steady-state emission rate coefficient of the gaseous HC by the transient correction coefficient to obtain the original emission rate of the gaseous HC; the first solid SOF emission rate is determined from the original gaseous HC emission rate based on an approximately linear relationship between the gaseous HC and the solid SOF emissions.
The gaseous HC steady-state emission Map is a rotation speed-torque-gaseous HC steady-state emission rate relation chart calibrated through experiments, and a gaseous HC steady-state emission rate coefficient can be obtained according to the rotation speed and torque of the engine and the gaseous HC steady-state emission Map. The transient correction coefficient Map is a steady-state excess air coefficient-steady-state excess air coefficient/transient excess air coefficient-transient correction coefficient relation diagram calibrated through a test, and the transient correction coefficient can be obtained according to the steady-state excess air coefficient, the steady-state excess air coefficient/transient excess air coefficient and the transient correction coefficient Map. The steady-state excess air ratio is obtained by inquiring a steady-state excess air ratio Map based on the rotation speed and the torque of the engine, and the steady-state excess air ratio Map is a calibrated rotation speed-torque-steady-state excess air ratio relation diagram based on the rotation speed and the torque of the engine and the measured excess air ratio in a steady state. The steady-state excess air ratio/transient excess air ratio is the value obtained by dividing the steady-state excess air ratio by the transient excess air ratio. And performing gas-solid conversion calculation on the original emission rate of the gaseous HC based on the approximate linear relation between the gaseous HC and the solid SOF emission to obtain a first solid SOF emission rate. The original emission rate of gaseous HC was in g/kwh and the first solid SOF emission rate was in mg/s.
A second solid SOF emission rate is determined by a second calculation mode based on the rotational speed, torque, steady state excess air ratio, and steady state excess air ratio/transient excess air ratio of the engine.
Specifically, according to the rotation speed and torque of the engine, determining a solid state SOF steady state emission rate coefficient through a solid state SOF steady state emission Map; determining a transient correction coefficient according to the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient through a transient correction coefficient Map; the solid state SOF steady state emission rate coefficient is multiplied by the transient modification coefficient to obtain a second solid state SOF emission rate.
The solid SOF steady-state emission Map is a rotation speed-torque-solid SOF steady-state emission rate relation graph calibrated through experiments, and the solid SOF steady-state emission rate coefficient can be obtained according to the rotation speed and torque of the engine and the solid SOF steady-state emission Map.
The first solid SOF emission rate, the second solid SOF emission rate, or a maximum of the first solid SOF emission rate and the second solid SOF emission rate is selected as an SOF raw emission rate based on a rotational speed and torque of the engine.
Specifically, whether the rotation speed of the engine is larger than a set rotation speed and whether the torque is larger than a set torque are judged; if the rotational speed of the engine is not greater than the set rotational speed and the torque is not greater than the set torque, selecting the first solid SOF emission rate as the SOF original emission rate; if the rotational speed of the engine is greater than the set rotational speed and the torque is greater than the set torque, selecting a second solid SOF emission rate as an SOF raw emission rate; if the rotational speed of the engine is not greater than the set rotational speed and the torque is greater than the set torque, or if the rotational speed is greater than the set rotational speed and the torque is not greater than the set torque, the maximum value of both the first solid SOF emission rate and the second solid SOF emission rate is selected as the SOF raw emission rate.
S2: the DOC adsorption rate of SOF is determined according to the exhaust temperature of the engine, the exhaust flow and the last SOF deposition amount.
Specifically, according to the exhaust temperature and the exhaust gas flow of the engine, determining an SOF adsorption rate coefficient through an SOF adsorption rate Map; according to the last SOF deposition amount, correcting CUR through the adsorption rate, and determining an adsorption rate correction coefficient; and multiplying the SOF adsorption rate coefficient by the adsorption rate correction coefficient to obtain the adsorption rate of the DOC on the SOF.
The SOF adsorption rate Map is an exhaust temperature-exhaust gas flow rate-SOF adsorption rate relation chart calibrated through experiments, and SOF adsorption rate coefficients can be obtained according to the exhaust temperature, the exhaust gas flow rate and the SOF adsorption rate Map. The adsorption rate correction CUR is a SOF deposition amount-adsorption rate correction coefficient relation table calibrated through experiments, and can obtain an adsorption rate correction coefficient according to the SOF deposition amount and the adsorption rate correction CUR obtained last time.
S3: and determining the removal rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow of the engine.
Specifically, according to the exhaust temperature and the exhaust gas flow, determining the passive regeneration rate of the DOC to the SOF through the passive regeneration rate Map of the DOC to the SOF; according to the exhaust temperature and the exhaust gas flow, determining the pyrolysis rate of the DOC to the SOF through the pyrolysis rate Map of the DOC to the SOF; the passive regeneration rate of DOC to SOF plus the pyrolysis rate of DOC to SOF yields the DOC removal rate to SOF.
The DOC passive regeneration rate Map for SOF is a graph of the relationship between the exhaust temperature, the exhaust flow and the DOC passive regeneration rate for SOF, which is calibrated through tests, and the DOC passive regeneration rate for SOF is obtained according to the exhaust temperature, the exhaust flow and the DOC passive regeneration rate Map for SOF. The pyrolysis rate Map of the DOC to the SOF is a pyrolysis rate relation diagram of the exhaust temperature, the exhaust gas flow and the DOC to the SOF, which are calibrated through experiments, and the pyrolysis rate Map of the DOC to the SOF is obtained according to the exhaust temperature, the exhaust gas flow and the pyrolysis rate Map of the DOC to the SOF.
S4: and determining the SOF deposition rate according to the SOF original emission rate, the DOC adsorption rate to the SOF and the DOC removal rate to the SOF.
Specifically, the product of the SOF raw emission rate and the DOC adsorption rate on the SOF minus the DOC removal rate on the SOF yields the SOF deposition rate.
S5: based on the SOF deposition rate, an amount of SOF deposition is determined.
Specifically, the SOF deposition rate is integrated over a set time to obtain the SOF deposition amount.
S6: performing DOC fault diagnosis and DOC performance recovery treatment;
specifically, performing the fault diagnosis of the DOC and the DOC performance recovery processing include:
s61: and judging whether the conversion efficiency of the DOC to HC is reduced.
If so, judging whether the SOF deposition amount is larger than the set SOF deposition amount.
If the conversion efficiency of HC by the DOC is reduced and the SOF deposit amount is greater than the set SOF deposit amount, S62 is performed.
If the conversion efficiency of HC by DOC is reduced and the SOF deposit amount is not greater than the set SOF deposit amount, S64 is directly performed.
S62: DOC was thermally managed at 300 ℃.
S63: and judging whether the conversion efficiency of the DOC to HC is recovered or not.
If yes, judging that the DOC fault is the SOF coverage fault.
If not, S64 is performed.
S64: DOC was thermally managed at 600 ℃.
S65: and judging whether the conversion efficiency of the DOC to HC is recovered or not.
If so, the DOC fault is judged to be sulfur poisoning.
If not, judging that the DOC fault is DOC aging.
Wherein, 300 ℃ heat management is realized by adjusting the opening degree of a throttle valve and/or the oil injection quantity of an aftertreatment system so that the temperature of the DOC is 300 ℃.600 ℃ thermal management is to adjust the opening degree of a throttle valve and/or the oil injection quantity of an aftertreatment system so that the temperature of the DOC is 600 ℃.
And when the conversion efficiency of the DOC to HC is reduced, fault diagnosis of the DOC and DOC performance recovery treatment are timely carried out so as to recover the DOC performance. By performing fault diagnosis and DOC performance recovery treatment of the DOC, the performance of the DOC is not affected, so that DPF regeneration and SCR conversion efficiency are not affected, the regeneration oil consumption can be reduced, the regeneration period is prolonged, and the use cost of a user is reduced.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (9)
- A method for calculating and diagnosing SOF deposit amount of doc, comprising:s1: determining an SOF original emission rate according to the rotating speed, the torque, the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient of the engine;s2: determining the adsorption rate of the DOC to the SOF according to the exhaust temperature, the exhaust gas flow and the last SOF deposition amount of the engine;s3: determining the removal rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow of the engine;s4: determining a SOF deposition rate according to the SOF original emission rate, the DOC adsorption rate to SOF and the DOC removal rate to SOF;s5: determining SOF deposition amount according to the SOF deposition rate;s6: performing DOC fault diagnosis and DOC performance recovery treatment;the DOC fault diagnosis and DOC performance recovery processing comprises the following steps:s61: judging whether the conversion efficiency of the DOC to HC is reduced or not;if yes, judging whether the SOF deposition amount is larger than a set SOF deposition amount;if the SOF deposition amount is greater than the set SOF deposition amount, S62 is performed;if the SOF deposition amount is not greater than the set SOF deposition amount, S64 is performed;s62: DOC performs 300 ℃ thermal management;s63: judging whether the conversion efficiency of the DOC to HC is recovered or not;if yes, judging that the DOC fault is an SOF coverage fault;if not, S64 is performed;s64: DOC thermal management at 600 ℃;s65: judging whether the conversion efficiency of the DOC to HC is recovered or not;if yes, judging that the DOC fault is sulfur poisoning;if not, judging that the DOC fault is DOC aging.
- 2. The method of calculating and diagnosing an amount of SOF deposit for a DOC of claim 1, wherein determining an SOF raw emission rate based on a rotational speed, torque, steady state excess air factor, and steady state excess air factor/transient excess air factor of the engine comprises:determining a first solid SOF emission rate through a first calculation mode based on a rotational speed, torque, steady state excess air factor, and steady state excess air factor/transient excess air factor of the engine;determining a second solid SOF emission rate through a second calculation mode based on the rotational speed, torque, steady state excess air factor, and steady state excess air factor/transient excess air factor of the engine;the first solid SOF emission rate, the second solid SOF emission rate, or a maximum of both the first solid SOF emission rate and the second solid SOF emission rate is selected as an SOF raw emission rate based on a rotational speed and torque of the engine.
- 3. The method for calculating and diagnosing an SOF deposition amount of a DOC as claimed in claim 2, wherein,determining, by a first calculation mode, a first solid state SOF emission rate based on a rotational speed, torque, steady state excess air ratio, and steady state excess air ratio/transient excess air ratio of the engine includes:according to the rotating speed and torque of the engine, determining a steady-state emission rate coefficient of the gaseous HC through a steady-state emission Map of the gaseous HC;determining a transient correction coefficient according to the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient through a transient correction coefficient Map;multiplying the steady-state emission rate coefficient of the gaseous HC by the transient correction coefficient to obtain the original emission rate of the gaseous HC;based on an approximately linear relationship of gaseous HC and solid SOF emissions, a first solid SOF emission rate is determined based on the gaseous HC raw emission rate.
- 4. The method of calculating and diagnosing an SOF deposit amount of a DOC according to claim 2, wherein determining a second solid SOF emission rate from the rotational speed, torque, steady-state excess air factor, and steady-state excess air factor/transient excess air factor of the engine by the second calculation mode includes:according to the rotation speed and torque of the engine, determining a solid SOF steady-state emission rate coefficient through a solid SOF steady-state emission Map;determining a transient correction coefficient according to the steady-state excess air coefficient and the steady-state excess air coefficient/transient excess air coefficient through a transient correction coefficient Map;and multiplying the steady-state solid SOF emission rate coefficient by the transient correction coefficient to obtain a second solid SOF emission rate.
- 5. The method of calculating and diagnosing an amount of SOF deposit of a DOC according to claim 2, wherein selecting the first solid SOF emission rate, the second solid SOF emission rate, or a maximum of both the first solid SOF emission rate and the second solid SOF emission rate as an SOF raw emission rate according to a rotational speed and a torque of an engine includes:judging whether the rotating speed of the engine is larger than the set rotating speed and whether the torque is larger than the set torque;if the rotational speed of the engine is not greater than the set rotational speed and the torque is not greater than the set torque, selecting the first solid SOF emission rate as the SOF raw emission rate;if the rotational speed of the engine is greater than the set rotational speed and the torque is greater than the set torque, selecting the second solid SOF emission rate as the SOF raw emission rate;if the rotational speed of the engine is not greater than the set rotational speed and the torque is greater than the set torque, or the rotational speed is greater than the set rotational speed and the torque is not greater than the set torque, then the maximum value of both the first solid SOF emission rate and the second solid SOF emission rate is selected as the SOF raw emission rate.
- 6. The method for calculating and diagnosing the SOF deposit amount of the DOC according to claim 1, wherein determining the rate of adsorption of the SOF by the DOC based on the exhaust temperature of the engine, the exhaust flow rate, and the last SOF deposit amount includes:determining an SOF adsorption rate coefficient according to the exhaust temperature and the exhaust gas flow of the engine through an SOF adsorption rate Map;according to the last SOF deposition amount, correcting CUR through the adsorption rate, and determining an adsorption rate correction coefficient;and multiplying the SOF adsorption rate coefficient by the adsorption rate correction coefficient to obtain the adsorption rate of the DOC on the SOF.
- 7. The method for calculating and diagnosing a SOF deposit amount of a DOC according to claim 1, wherein determining a rate of DOC removal of SOF based on an exhaust temperature of an engine and an exhaust flow rate includes:determining the passive regeneration rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow through the passive regeneration rate Map of the DOC to the SOF;determining the pyrolysis rate of the DOC to the SOF according to the exhaust temperature and the exhaust gas flow through the pyrolysis rate Map of the DOC to the SOF;and the DOC is added with the passive regeneration rate of the SOF and the pyrolysis rate of the DOC to the SOF to obtain the removal rate of the DOC to the SOF.
- 8. The method of calculating and diagnosing an amount of SOF deposit of a DOC according to claim 1, wherein determining an SOF deposit rate based on the SOF raw emission rate, the DOC adsorption rate for SOF, and the DOC removal rate for SOF comprises:and subtracting the DOC removal rate from the SOF original emission rate multiplied by the DOC adsorption rate to SOF to obtain the SOF deposition rate.
- 9. The method of calculating and diagnosing an amount of SOF deposit for a DOC according to claim 1, characterized in that determining an amount of SOF deposit from the rate of SOF deposit comprises:and integrating the SOF deposition rate within a set time to obtain the SOF deposition amount.
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