CN112727569A - DPF self-adaptive active regeneration control method, device and system - Google Patents

DPF self-adaptive active regeneration control method, device and system Download PDF

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CN112727569A
CN112727569A CN202110028271.8A CN202110028271A CN112727569A CN 112727569 A CN112727569 A CN 112727569A CN 202110028271 A CN202110028271 A CN 202110028271A CN 112727569 A CN112727569 A CN 112727569A
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dpf
active regeneration
combustion
total amount
oxygen
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CN112727569B (en
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李芳�
韩虎
郑攀
杨晓莹
王梅俊
程欢
白桃李
李林
陈玉俊
周杰敏
张衡
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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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
    • F01N3/025—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 using fuel burner or by adding fuel to exhaust
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention discloses a DPF self-adaptive active regeneration control method, a DPF self-adaptive active regeneration control device and a DPF self-adaptive active regeneration control system, which relate to the technical field of exhaust aftertreatment of an internal combustion engine, and the method comprises the following steps: obtaining the total amount of heat released by the soot combustion or the total amount of oxygen consumed by the soot combustion in the DPF active regeneration process of the diesel particulate filter; obtaining the total amount of the root participating in combustion in the active regeneration process according to the total amount of heat release of the root combustion or the total amount of oxygen consumed by the root combustion; adjusting the carbon load estimation model based on the difference between the carbon load at the beginning of the active regeneration and the total amount of the roots participating in the combustion in the active regeneration process calculated by the carbon load estimation model; and triggering the next active regeneration of the DPF according to the adjusted carbon loading estimation model. The invention can simply and conveniently adjust the carbon load estimation model, and is beneficial to the realization of engineering.

Description

DPF self-adaptive active regeneration control method, device and system
Technical Field
The invention relates to the technical field of exhaust aftertreatment of internal combustion engines, in particular to a DPF self-adaptive active regeneration control method, device and system.
Background
Diesel Particulate traps (DPFs) are the requisite aftertreatment devices for Diesel engines to meet emissions legislation requirements. The DPF collects Particulate Matter (PM) in the exhaust gas of the diesel engine by means of physical filtration, and reduces the PM emission of the diesel engine. As particulate matter accumulates in the DPF channels, the pressure drop across the DPF can increase, which can increase the exhaust backpressure of the engine, deteriorate the fuel consumption of the engine, and in severe cases can even directly block the exhaust pipe, causing engine damage. Therefore, during the use of the DPF, it is generally necessary to periodically perform a regeneration operation on the DPF to oxidize and remove the soot accumulated in the DPF, so that the flow resistance of the DPF is controlled within a reasonable range, and the normal operation of the engine and the DPF is ensured.
Currently, the regeneration technology of DPF can be divided into passive regeneration and active regeneration from the regeneration mode. Passive regeneration is the combustion of trapped particulate matter using exhaust conditions created by the high speed, high load conditions of the engine that may exist, but this approach does not eliminate DPF plugging failures because the mode in which the user uses the engine is uncertain. Active regeneration is a special system for regenerating a DPF by generating exhaust gas at a temperature higher than a temperature at which particulate matter in the DPF can ignite at any time based on a monitored operating state of the DPF.
In the DPF active regeneration control process, the judgment of the DPF regeneration time is an important link in the DPF active regeneration control. Premature regeneration of the DPF can result in frequent DPF regeneration, which can reduce the fuel economy of the engine due to increased fuel consumption for DPF regeneration. The delayed regeneration of the DPF can cause that the temperature in the DPF is too high, the filter carrier is burnt, and the reliability and the durability of the DPF are reduced because the accumulated soot in the DPF is too much during regeneration, the soot is oxidized and burnt too violently, and the speed of releasing heat is too high. Therefore, during the DPF active regeneration control process, a prediction model of the DPF carbon loading is generally established to estimate the carbon loading in the DPF in real time. When the carbon loading in the DPF reaches a preset carbon loading, a regeneration operation is performed on the DPF.
The existing DPF carbon loading capacity prediction model generally estimates the carbon loading capacity in a DPF through a correlation relationship between the pre-calibrated DPF carbon loading capacity and the pressure difference between the front and the back of the DPF, the pressure difference between the front and the back of the DPF measured by a pressure difference sensor, and the combination of engine exhaust flow and DPF inlet temperature. However, during DPF regeneration, the ash component in the PM accumulated in the DPF cannot be removed by means of regeneration, as the service life of the DPF increases, the ash is accumulated in the DPF continuously, and the correlation between the DPF carbon loading and the DPF pressure difference is changed, thereby causing the estimation error of the DPF carbon loading by the DPF carbon loading prediction model, on the other hand, the distribution form of the PM in the DPF is related to the DPF pressure difference, the same carbon loading may cause the DPF pressure difference to be different due to the different distribution forms, and the above factors can cause the DPF to be regenerated too early or delayed.
However, in order to correct the carbon load estimation model, the prior art mainly calibrates a corresponding correction coefficient according to mileage or operating conditions, and corrects the estimated carbon load by using a table look-up method, and the correction method is not associated with the current actual carbon load level of the DPF, so that the error is large.
Disclosure of Invention
In view of the shortcomings in the prior art, a first aspect of the present invention provides a DPF adaptive active regeneration control method, which can correlate with the current actual carbon loading level of a DPF when a carbon loading estimation model is modified, so as to reduce the error in the modification.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a DPF adaptive active regeneration control method, the method comprising the steps of:
obtaining the total amount of heat released by the soot combustion or the total amount of oxygen consumed by the soot combustion in the DPF active regeneration process of the diesel particulate filter;
obtaining the total amount of the root participating in combustion in the active regeneration process according to the total amount of heat release of the root combustion or the total amount of oxygen consumed by the root combustion;
adjusting the carbon load estimation model based on the difference between the carbon load at the beginning of the active regeneration and the total amount of the roots participating in the combustion in the active regeneration process calculated by the carbon load estimation model;
and triggering the next active regeneration of the DPF according to the adjusted carbon loading estimation model.
In some embodiments, said obtaining the total amount of soot combustion heat release during active regeneration of the DPF comprises:
acquiring DOC inlet exhaust energy and DPF outlet exhaust energy of a diesel oxidation catalyst in an active regeneration process, and DOC heat transfer and DPF heat transfer;
calculating the heat release quantity of combustion injected by HC in the active regeneration process;
according to the formula: total heat release amount ═ integral multiple (t) of root combustionRegeneration time(DPF outlet exhaust energy-DOC inlet exhaust energy-DOC heat transfer-DPF heat transfer) -HC injection combustion heat release, and the total amount of soot combustion heat release in the active regeneration process is calculated.
In some embodiments, obtaining DOC inlet exhaust energy and DPF outlet exhaust energy, and DOC heat transfer and DPF heat transfer during DPF active regeneration comprises:
collecting a first temperature of a DOC inlet and a second temperature of a DPF outlet;
acquiring DOC inlet exhaust energy according to the DOC inlet exhaust pressure, the exhaust mass flow and the first temperature;
acquiring the exhaust energy of the DPF outlet according to the exhaust pressure, the exhaust mass flow and the second temperature of the DPF outlet;
and establishing a DOC and DPF temperature model, and calculating DOC heat transfer and DPF heat transfer according to the heat exchange heat transfer between the wall surface and the air according to the first temperature and the second temperature.
In other embodiments, the obtaining the total amount of oxygen consumed by the soot combustion during the DPF active regeneration comprises:
collecting DPF outlet oxygen content and DOC inlet oxygen content;
calculating the total oxygen consumption of HC oxidation;
according to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content) -total oxygen consumed by HC oxidation, the total oxygen consumed by soot combustion during active regeneration is determined.
In some embodiments, the obtaining the total amount of oxygen consumed by the soot combustion during the active regeneration process comprises:
collecting DPF outlet oxygen content and DOC inlet oxygen content;
calculating the rate of oxygen consumption by HC oxidation; calculated according to HC oxidation model
According to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content-rate of oxygen consumed by HC oxidation), the total amount of oxygen consumed by the soot combustion during active regeneration is determined.
A second aspect of the invention provides a DPF adaptive active regeneration control apparatus that, when a carbon loading estimation model is modified, can be correlated with a current actual carbon loading level of the DPF to reduce an error in the modification. .
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a DPF adaptive active regeneration control apparatus comprising:
the calculation module is used for acquiring the gross amount of heat released by the soot combustion or the gross amount of oxygen consumed by the soot combustion in the DPF active regeneration process, and acquiring the gross amount of the soot participating in the combustion in the active regeneration process according to the gross amount of heat released by the soot combustion or the gross amount of oxygen consumed by the soot combustion;
an adjustment module that adjusts the carbon load estimation model based on a difference between the carbon load at the start of regeneration calculated by the carbon load estimation model and the total amount of the roots participating in combustion during active regeneration;
and a regeneration control module that actively regenerates the DPF based on the corrected carbon loading estimation model.
In some embodiments, the calculation module is to:
acquiring DOC inlet exhaust energy and DPF outlet exhaust energy, DOC heat transfer and DPF heat transfer in the active regeneration process;
calculating the heat release quantity of combustion injected by HC in the active regeneration process;
according to the formula: total heat release amount ═ integral multiple (t) of root combustionRegeneration time(DPF outlet exhaust energy-DOC inlet exhaust energy-DOC heat transfer-DPF heat transfer) -HC injection combustion heat release, and the total amount of soot combustion heat release in the active regeneration process is calculated.
In some embodiments, the calculation module comprises:
a first temperature sensor for acquiring a first temperature of the DOC inlet;
the second temperature sensor is used for acquiring a second temperature of the DPF outlet;
the first calculation unit is used for acquiring DOC inlet exhaust energy according to the DOC inlet exhaust pressure, the exhaust mass flow and the first temperature, acquiring DPF outlet exhaust energy according to the DPF outlet exhaust pressure, the exhaust mass flow and the second temperature, establishing a DOC and DPF temperature model, and calculating DOC heat transfer and DPF heat transfer according to the first temperature and the second temperature and the heat exchange and transfer of the wall surface and air.
In other embodiments, the computing module comprises:
a first oxygen sensor for collecting DOC inlet oxygen content;
the second oxygen sensor is used for collecting the oxygen content at the outlet of the DPF;
a second calculation unit for calculating the total amount of oxygen consumed by oxidation of HC, according to the formula: root combustionTotal amount of oxygen consumed ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content) -total oxygen consumed by HC oxidation, determining total oxygen consumed by soot combustion during active regeneration;
or, for calculating the rate of oxygen consumed by oxidation of HC, and according to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content-rate of oxygen consumed by HC oxidation), the total amount of oxygen consumed by the soot combustion during active regeneration is determined.
A third aspect of the invention provides a DPF adaptive active regeneration control system that, when modifying the carbon loading estimation model, can correlate to the current actual carbon loading level of the DPF to reduce the error in the modification.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a DPF adaptive active regeneration control system comprising the DPF adaptive active regeneration control apparatus of claim.
Compared with the prior art, the invention has the advantages that:
according to the DPF self-adaptive active regeneration control method, the total amount of the root participating in combustion in the active regeneration process can be obtained only by acquiring the heat release total amount or the oxidation rate of the root combustion in the DPF active regeneration process, and the carbon loading capacity estimation model can be adjusted based on the difference value of the carbon loading capacity at the regeneration start time and the total amount of the root participating in combustion in the active regeneration process calculated by the carbon loading capacity estimation model. In the whole process, only the first temperature of the DOC inlet and the second temperature of the DPF outlet are required to be acquired; or collecting the oxygen content at the outlet of the DPF and the oxygen content at the inlet of the DOC, and when the carbon load estimation model is corrected, the oxygen content can be correlated with the current actual carbon load level of the DPF so as to reduce the error of correction. In addition, an excessively complex theoretical model does not need to be established in the calculation process, and the solution is not needed through solving an equation set, so that the engineering realization is facilitated.
Drawings
FIG. 1 is a flow chart of a DPF adaptive active regeneration control method in an embodiment of the present invention;
FIG. 2 is a flow chart of the embodiment of the invention for obtaining the total amount of hot release from soot combustion during DPF active regeneration;
FIG. 3 is a flow chart of the present invention for obtaining the total amount of oxygen consumed by the soot combustion during the active regeneration of a DPF;
FIG. 4 is a flow chart of the method for obtaining the total amount of oxygen consumed by the soot combustion during the active regeneration of a DPF in accordance with another embodiment of the present invention;
FIG. 5 is a schematic diagram of a DPF adaptive active regeneration control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present invention provides a DPF adaptive active regeneration control method, including the following steps:
s1, obtaining the total amount of heat released by the soot combustion or the total amount of oxygen consumed by the soot combustion in the DPF active regeneration process of the diesel particulate filter.
And S2, obtaining the total amount of the root participating in combustion in the active regeneration process according to the total amount of heat release of the root combustion or the total amount of oxygen consumed by the root combustion.
And S3, adjusting the carbon load estimation model based on the difference between the carbon load at the beginning of the active regeneration and the total amount of the root participating in combustion in the active regeneration process calculated by the carbon load estimation model.
And S4, triggering the next active regeneration of the DPF according to the adjusted carbon loading estimation model.
In the present invention, in order to obtain the total amount of soot involved in combustion during active regeneration, two ways are adopted, one is obtained by calculating the total amount of heat released by the soot combustion, and the other is obtained by calculating the total amount of oxygen consumed by the soot combustion.
Referring to fig. 2, obtaining the total amount of hot combustion heat release during the DPF active regeneration process includes the following steps:
s10, acquiring DOC inlet exhaust energy and DPF outlet exhaust energy of the diesel oxidation catalyst in the active regeneration process, and acquiring DOC heat transfer and DPF heat transfer.
Specifically, first temperature of a DOC inlet and second temperature of a DPF outlet are collected, and then exhaust energy of the DOC inlet is obtained according to exhaust pressure, exhaust mass flow and the first temperature of the DOC inlet; and acquiring the exhaust energy at the DPF outlet according to the exhaust pressure, the exhaust mass flow and the second temperature at the DPF outlet.
It is understood that the exhaust gas pressure at the inlet of the DOC, the exhaust mass flow rate, the exhaust gas pressure at the outlet of the DPF, and the exhaust mass flow rate can all be obtained by measurement.
In the embodiment, the DOC heat transfer and the DPF heat transfer in the active regeneration process are obtained mainly by establishing DOC and DPF temperature models and then calculating the DOC heat transfer and the DPF heat transfer according to the heat exchange heat transfer between the wall surface and the air according to the first temperature and the second temperature respectively. The specific way to calculate DOC heat transfer and DPF heat transfer is prior art and therefore will not be described herein.
And S11, calculating the combustion heat release quantity of HC injection in the active regeneration process.
S12, according to a formula: total heat release amount ═ integral multiple (t) of root combustionRegeneration time(DPF outlet exhaust energy-DOC inlet exhaust energy-DOC heat transfer-DPF heat transfer) -HC injection combustion heat release, and the total amount of soot combustion heat release in the active regeneration process is calculated.
It is worth to say that the DPF regeneration needs to raise the exhaust temperature, the far back injection in the cylinder or the extra injection fuel in the single nozzle of the exhaust pipe can be used, the injected fuel does not participate in the combustion in the cylinder, but is oxidized in the DOC to release heat, the exhaust is heated, and the purpose of raising the exhaust temperature is achieved. Therefore, in order to obtain the total amount of the soot combustion heat release during the DPF active regeneration, the fuel heat release amount injected alone, that is, the combustion heat release amount of the HC injection, should be subtracted, wherein the fuel heat release amount injected alone is calculated from the diesel combustion heat value.
After the total amount of the hot combustion heat release in the DPF active regeneration process is obtained, the total amount M of the hot combustion can be pushed out from the heat release of the combustion according to the heat release rule of the chemical reactionAAnd the carbon load at the start of regeneration calculated by the carbon load estimation model is MBAnd thus can be represented by MAAnd MBThe difference in carbon loading was corrected for the carbon loading estimation model.
Further, referring to FIG. 3, obtaining the total amount of oxygen consumed by the soot combustion during the DPF active regeneration comprises the steps of:
and S13, collecting the oxygen content of the DPF outlet and the oxygen content of the DOC inlet.
S14, calculating the total oxygen consumed by HC oxidation.
S15, according to a formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content) -total oxygen consumed by HC oxidation, the total oxygen consumed by soot combustion during active regeneration is determined.
It is worth noting that the difference in DPF outlet oxygen content relative to DOC inlet oxygen content is partly due to the consumption of HC combusted by the individual injection and partly due to oxidation of soot to CO2, and the HC injection rate of the individual injection is known, i.e. the total amount of oxygen consumed by HC oxidation can be calculated (e.g. from the chemical reaction equation of diesel). The total oxygen consumption of the soot combustion can be obtained through integration, and then the total soot combustion quantity M can be calculatedASimilarly, the carbon loading at the start of regeneration calculated by the carbon loading estimation model is MBAnd thus can be represented by MAAnd MBThe difference in carbon loading was corrected for the carbon loading estimation model.
Further, referring to FIG. 4, in other embodiments, obtaining the total amount of oxygen consumed by the soot combustion during the active regeneration of the DPF comprises the steps of:
and S13, collecting the oxygen content of the DPF outlet and the oxygen content of the DOC inlet.
And S16, calculating the oxygen consumption rate of HC oxidation.
S17, according to a formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content-rate of oxygen consumed by HC oxidation), the total amount of oxygen consumed by the soot combustion during active regeneration is determined.
The difference between this embodiment and the previous embodiment is that the total amount of oxygen consumed by the soot combustion is calculated by calculating the rate at which oxygen is consumed by HC oxidation. The rate at which oxygen is consumed by HC oxidation can be calculated by an HC oxidation model.
Referring to FIG. 5, the DPF adaptive active regeneration control method of the present invention will be further described:
first, the carbon loading estimation model calculates the current carbon loading in real time, and if the current carbon loading is greater than a preset threshold, the DPF active regeneration is triggered. In this case, on the one hand, the total amount of the soot participating in the combustion in the active regeneration process M can be obtained according to the total amount of heat released by the soot combustion or the total amount of oxygen consumed by the soot combustionAOn the other hand, the carbon load M at the start of regeneration can be calculated from the carbon load estimation modelBThus, M can be obtainedAAnd MBBased on the difference of MAAnd MBThe difference value is further adjusted through a self-adaptive algorithm, and then the DPF can be triggered to be actively regenerated for the next time according to the adjusted carbon load estimation model.
In summary, in the DPF adaptive active regeneration control method of the present invention, the total amount of the soot involved in combustion during the active regeneration process can be obtained by only obtaining the total amount of the soot combustion heat release or the total amount of the oxygen consumed by the soot combustion during the DPF active regeneration process, and the carbon loading estimation model can be adjusted based on the difference between the carbon loading at the start of regeneration calculated by the carbon loading estimation model and the total amount of the soot involved in combustion during the active regeneration process. In the whole process, only the first temperature of the DOC inlet and the second temperature of the DPF outlet are required to be acquired; or collecting the DPF outlet oxygen content and DOC inlet oxygen content, which can be correlated with the current actual carbon loading level of the DPF when the carbon loading estimation model is corrected, so as to reduce the error of correction. In addition, an excessively complex theoretical model does not need to be established in the calculation process, and the solution is not needed through solving an equation set, so that the engineering realization is facilitated.
Meanwhile, the invention also provides a DPF self-adaptive active regeneration control device which comprises a calculation module, an adjustment module and a regeneration control module.
The calculation module is used for acquiring the total amount of heat released by the soot combustion or the total amount of oxygen consumed by the soot combustion in the DPF active regeneration process, and acquiring the total amount of soot participating in the combustion in the active regeneration process according to the total amount of heat released by the soot combustion or the total amount of oxygen consumed by the soot combustion.
The adjusting module adjusts the carbon load estimation model based on a difference between the carbon load at the start of regeneration calculated by the carbon load estimation model and the total amount of the root participating in combustion in the active regeneration process.
The regeneration control module triggers active regeneration of the DPF based on the modified carbon loading estimation model.
In some embodiments, the calculation module is to:
and acquiring DOC inlet exhaust energy and DPF outlet exhaust energy, DOC heat transfer and DPF heat transfer in the active regeneration process.
Calculating the heat release of combustion of HC injection during active regeneration according to the formula: total heat release amount ═ integral multiple (t) of root combustionRegeneration time(DPF outlet exhaust energy-DOC inlet exhaust energy-DOC heat transfer-DPF heat transfer) -HC injection combustion heat release, and the total amount of soot combustion heat release in the active regeneration process is calculated.
Specifically, the calculation module includes a first temperature sensor, a second temperature sensor, and a first calculation unit.
The first temperature sensor is used for acquiring a first temperature of the DOC inlet. The second temperature sensor is used for acquiring a second temperature at the DPF outlet.
The first calculation unit obtains the DOC inlet exhaust energy according to the DOC inlet exhaust pressure, the exhaust mass flow and the first temperature, and obtains the DPF outlet exhaust energy according to the DPF outlet exhaust pressure, the exhaust mass flow and the second temperature.
After the total amount of the hot combustion heat release in the DPF active regeneration process is obtained, the total amount M of the hot combustion can be pushed out from the heat release of the combustion according to the heat release rule of the chemical reactionAAnd the carbon load at the start of regeneration calculated by the carbon load estimation model is MBAnd thus can be represented by MAAnd MBThe difference in carbon loading was corrected for the carbon loading estimation model.
In some embodiments, the calculation module includes a first oxygen sensor, a second oxygen sensor, and a second calculation unit.
The first oxygen sensor is used to collect the DOC inlet oxygen content. The second oxygen sensor is used for collecting the oxygen content at the outlet of the DPF.
The second calculating unit is used for calculating the total oxygen consumed by HC oxidation, and according to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content) -total oxygen consumed by HC oxidation, the total oxygen consumed by soot combustion during active regeneration is determined.
Or, for calculating the rate of oxygen consumed by oxidation of HC, and according to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content-rate of oxygen consumed by HC oxidation), the total amount of oxygen consumed by the soot combustion during active regeneration is determined.
After the total oxygen consumed by the combustion of the root is obtained, the total amount M of the root participating in the combustion can be calculatedASimilarly, the carbon loading at the start of regeneration calculated by the carbon loading estimation model is MBAnd thus can be represented by MAAnd MBThe difference in carbon loading was corrected for the carbon loading estimation model.
In summary, in the DPF adaptive active regeneration control apparatus of the present invention, the carbon loading estimation model can be adjusted by acquiring the total amount of the hot released from the soot combustion or the total amount of the oxygen consumed by the soot combustion in the DPF active regeneration process, i.e., the total amount of the soot participating in the combustion in the active regeneration process, and based on the difference between the carbon loading at the start of regeneration calculated by the carbon loading estimation model and the total amount of the soot participating in the combustion in the active regeneration process. In the whole process, only the first temperature of the DOC inlet and the second temperature of the DPF outlet are required to be acquired; or collecting the DPF outlet oxygen content and DOC inlet oxygen content, which can be correlated with the current actual carbon loading level of the DPF when the carbon loading estimation model is corrected, so as to reduce the error of correction. In addition, an excessively complex theoretical model does not need to be established in the calculation process, and the solution is not needed through solving an equation set, so that the engineering realization is facilitated.
Meanwhile, the invention also provides a DPF adaptive active regeneration control system which comprises the DPF adaptive active regeneration control device.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are 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 merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A DPF adaptive active regeneration control method, comprising the steps of:
obtaining the total amount of heat released by the soot combustion or the total amount of oxygen consumed by the soot combustion in the DPF active regeneration process of the diesel particulate filter;
obtaining the total amount of the root participating in combustion in the active regeneration process according to the total amount of heat release of the root combustion or the total amount of oxygen consumed by the root combustion;
adjusting the carbon load estimation model based on the difference between the carbon load at the beginning of the active regeneration and the total amount of the roots participating in the combustion in the active regeneration process calculated by the carbon load estimation model;
and triggering the next active regeneration of the DPF according to the adjusted carbon loading estimation model.
2. The DPF adaptive active regeneration control method of claim 1, wherein the obtaining the total amount of hot combustion heat release during the DPF active regeneration comprises:
acquiring DOC inlet exhaust energy and DPF outlet exhaust energy of a diesel oxidation catalyst in an active regeneration process, and DOC heat transfer and DPF heat transfer;
calculating the heat release quantity of combustion injected by HC in the active regeneration process;
according to the formula: total heat release amount ═ integral multiple (t) of root combustionRegeneration time(DPF outlet exhaust energy-DOC inlet exhaust energy-DOC heat transfer-DPF heat transfer) -HC injection combustion heat release, and the total amount of soot combustion heat release in the active regeneration process is calculated.
3. The DPF adaptive active regeneration control method of claim 2, wherein obtaining DOC inlet exhaust energy and DPF outlet exhaust energy, and DOC heat transfer and DPF heat transfer during active regeneration comprises:
collecting a first temperature of a DOC inlet and a second temperature of a DPF outlet;
acquiring DOC inlet exhaust energy according to the DOC inlet exhaust pressure, the exhaust mass flow and the first temperature;
acquiring the exhaust energy of the DPF outlet according to the exhaust pressure, the exhaust mass flow and the second temperature of the DPF outlet;
and establishing a DOC and DPF temperature model, and calculating DOC heat transfer and DPF heat transfer according to the heat exchange heat transfer between the wall surface and the air according to the first temperature and the second temperature.
4. The DPF adaptive active regeneration control method of claim 1, wherein the obtaining a total amount of oxygen consumed by a soot combustion during the DPF active regeneration comprises:
collecting DPF outlet oxygen content and DOC inlet oxygen content;
calculating the total oxygen consumption of HC oxidation;
according to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content) -total oxygen consumed by HC oxidation, the total oxygen consumed by soot combustion during active regeneration is determined.
5. The DPF adaptive active regeneration control method of claim 1, wherein the obtaining a total amount of oxygen consumed by a soot combustion during the DPF active regeneration comprises:
collecting DPF outlet oxygen content and DOC inlet oxygen content;
calculating the rate of oxygen consumption by HC oxidation; calculated according to HC oxidation model
According to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content-rate of oxygen consumed by HC oxidation), the total amount of oxygen consumed by the soot combustion during active regeneration is determined.
6. A DPF adaptive active regeneration control apparatus comprising:
the calculation module is used for acquiring the gross amount of heat released by the soot combustion or the gross amount of oxygen consumed by the soot combustion in the DPF active regeneration process, and acquiring the gross amount of the soot participating in the combustion in the active regeneration process according to the gross amount of heat released by the soot combustion or the gross amount of oxygen consumed by the soot combustion;
an adjustment module that adjusts the carbon load estimation model based on a difference between the carbon load at the start of regeneration calculated by the carbon load estimation model and the total amount of the roots participating in combustion during active regeneration;
and a regeneration control module that actively regenerates the DPF based on the corrected carbon loading estimation model.
7. The DPF adaptive active regeneration control apparatus of claim 6, wherein the calculation module is configured to:
acquiring DOC inlet exhaust energy and DPF outlet exhaust energy, DOC heat transfer and DPF heat transfer in the active regeneration process;
calculating the heat release quantity of combustion injected by HC in the active regeneration process;
according to the formula: total heat release amount ═ integral multiple (t) of root combustionRegeneration time(DPF outlet exhaust energy-DOC inlet exhaust energy-DOC heat transfer-DPF heat transfer) -HC injection combustion heat release, and the total amount of soot combustion heat release in the active regeneration process is calculated.
8. A DPF adaptive active regeneration control apparatus as set forth in claim 7 wherein said calculation module comprises:
a first temperature sensor for acquiring a first temperature of the DOC inlet;
the second temperature sensor is used for acquiring a second temperature of the DPF outlet;
the first calculation unit is used for acquiring DOC inlet exhaust energy according to the DOC inlet exhaust pressure, the exhaust mass flow and the first temperature, acquiring DPF outlet exhaust energy according to the DPF outlet exhaust pressure, the exhaust mass flow and the second temperature, establishing a DOC and DPF temperature model, and calculating DOC heat transfer and DPF heat transfer according to the first temperature and the second temperature and the heat exchange and transfer of the wall surface and air.
9. The DPF adaptive active regeneration control apparatus of claim 6, wherein the calculation module comprises:
a first oxygen sensor for collecting DOC inlet oxygen content;
the second oxygen sensor is used for collecting the oxygen content at the outlet of the DPF;
a second calculation unit for calculating the total amount of oxygen consumed by oxidation of HC, according to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content) -total oxygen consumed by HC oxidation, determining total oxygen consumed by soot combustion during active regeneration;
or, for calculating the rate of oxygen consumed by oxidation of HC, and according to the formula: total oxygen consumption by root combustion ═ t-Regeneration time(DOC inlet oxygen content-DPF outlet oxygen content-rate of oxygen consumed by HC oxidation), the total amount of oxygen consumed by the soot combustion during active regeneration is determined.
10. A DPF adaptive active regeneration control system comprising the DPF adaptive active regeneration control apparatus according to any one of claims 6 to 9.
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