CN114961927B - Particulate matter filtering efficiency control method and device - Google Patents
Particulate matter filtering efficiency control method and device Download PDFInfo
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- CN114961927B CN114961927B CN202210674231.5A CN202210674231A CN114961927B CN 114961927 B CN114961927 B CN 114961927B CN 202210674231 A CN202210674231 A CN 202210674231A CN 114961927 B CN114961927 B CN 114961927B
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- 239000013618 particulate matter Substances 0.000 title claims abstract description 115
- 238000001914 filtration Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000779 smoke Substances 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 41
- 230000008929 regeneration Effects 0.000 claims description 34
- 238000011069 regeneration method Methods 0.000 claims description 34
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 230000010354 integration Effects 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 9
- 239000004071 soot Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009423 ventilation 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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The application provides a method and a device for controlling particulate matter filtering efficiency. Firstly, determining the time for carrying out heat calculation according to the temperature of the particulate matter catcher and the mass flow of the exhaust gas, and carrying out heat calculation according to the temperature of the particulate matter catcher and the mass flow of the exhaust gas to obtain a first result when the time for carrying out heat calculation is met; if the first result meets the first condition or the second condition, controlling the particulate matter trap to improve the original discharge amount of unburned carbon smoke and keeping the particulate matter filtering efficiency; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold. Therefore, the moment of reducing the particulate filtering efficiency is judged by carrying out heat calculation according to the temperature of the particulate trap and the mass flow of the exhaust gas, the particulate trap is controlled in advance to improve the original discharge amount of unburned carbon smoke, and the reduction of the particulate filtering efficiency is avoided. Therefore, the problem that the exceeding risk exists in particulate matter emission in the prior art is solved.
Description
Technical Field
The application relates to the technical field of particulate matter removal, in particular to a particulate matter filtering efficiency control method and device.
Background
Particulate traps are used to trap engine particulates, thereby reducing the amount of dust emitted to the atmosphere. According to the regulation requirements, the emission of the after-treatment particulate matters is monitored in real time. Before ash deposition does not occur in the fresh particulate matter catcher, and the carbon layer is damaged due to the fact that the fresh particulate matter catcher is subjected to high-temperature passive regeneration, the filtering efficiency is reduced, and the risk of exceeding the standard exists in particulate matter emission.
The prior art does not have a mature solution to the problem of excessive risk of particulate emissions.
Disclosure of Invention
In view of the above, the embodiment of the application provides a method and a device for controlling the filtration efficiency of particulate matters, which aim to solve the problem that the discharge of particulate matters in the prior art has an excessive risk.
In a first aspect, an embodiment of the present application provides a method for controlling particulate filtering efficiency, where the method includes:
determining the time for carrying out heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas;
performing heat calculation at the moment according to the temperature of the particulate matter trap and the exhaust gas mass flow to obtain a first result;
if the first result meets the first condition or the second condition, controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold.
Optionally, the determining the time for calculating heat according to the temperature of the particulate matter trap and the mass flow of the exhaust gas specifically includes:
determining a timing at which the upstream temperature of the particulate matter trap is greater than a third threshold, or at which the exhaust mass flow is greater than a fourth threshold and the upstream temperature of the particulate matter trap is greater than a fifth threshold as a timing at which a heat calculation is performed; the fifth threshold is less than the third threshold, and the fifth threshold is a lowest temperature at which passive regeneration of the particulate trap occurs.
Optionally, the calculating the heat according to the temperature of the particulate matter trap and the mass flow of the exhaust gas to obtain a first result specifically includes:
and performing double integration on the temperature of the particulate matter trap and the exhaust gas mass flow to obtain the first result.
Optionally, after the timing of performing the heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas is determined, the method further includes:
enabling a first timer and a second timer respectively when heat calculation is started, and keeping the current accumulated time by the first timer when the first result does not meet a first condition or a second condition;
and when the ratio of the timing data of the first timer to the timing data of the second timer is smaller than a preset value and the first result does not meet the first condition, clearing the heat calculation data and carrying out heat calculation again.
Optionally, the method is performed after replacing or cleaning the particulate trap, or when ash in the particulate trap is less than a seventh threshold.
In a second aspect, an embodiment of the present application provides a particulate matter filtration efficiency control device, including: the device comprises a timing determining module, a calculating module and a control module;
the timing determining module is used for determining the timing of heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas;
the calculation module is used for calculating heat according to the temperature of the particulate matter catcher and the mass flow of the waste gas at the moment to obtain a first result;
the control module is used for controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke if the first result meets a first condition or a second condition; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold.
Optionally, the timing determining module is specifically configured to:
determining a timing at which the upstream temperature of the particulate matter trap is greater than a third threshold, or at which the exhaust mass flow is greater than a fourth threshold and the upstream temperature of the particulate matter trap is greater than a fifth threshold as a timing at which a heat calculation is performed; the fifth threshold is less than the third threshold, and the fifth threshold is a lowest temperature at which passive regeneration of the particulate trap occurs.
Optionally, the computing module is specifically configured to:
and performing double integration on the temperature of the particulate matter trap and the exhaust gas mass flow to obtain the first result.
Optionally, the device further includes a timing module, and the timing module is specifically configured to:
enabling a first timer and a second timer respectively when heat calculation is started, and keeping the current accumulated time by the first timer when the first result does not meet a first condition or a second condition;
and when the ratio of the timing data of the first timer to the timing data of the second timer is smaller than a preset value and the first result does not meet the first condition, clearing the heat calculation data and carrying out heat calculation again.
Optionally, the device further includes an execution module, specifically configured to:
the timing determination module, the calculation module, and the control module are triggered to operate after the particulate trap is replaced or cleaned, or when ash in the particulate trap is less than a seventh threshold, the timing determination module, the calculation module, and the control module are triggered to operate.
The embodiment of the application provides a method and a device for controlling particulate matter filtering efficiency. When the method is executed, the time for carrying out heat calculation is firstly determined according to the temperature of the particulate matter catcher and the mass flow of the exhaust gas, and when the time for carrying out heat calculation is met, the first result is obtained by carrying out heat calculation according to the temperature of the particulate matter catcher and the mass flow of the exhaust gas; if the first result meets the first condition or the second condition, controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke and keep the particulate matter filtering efficiency; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold. Therefore, the moment of reducing the particulate filtering efficiency is judged by carrying out heat calculation according to the temperature of the particulate trap and the mass flow of the exhaust gas, the particulate trap is controlled in advance to improve the original discharge amount of unburned carbon smoke, and the reduction of the particulate filtering efficiency is avoided. Therefore, the problem that the exceeding risk exists in particulate matter emission in the prior art is solved.
Drawings
In order to more clearly illustrate this embodiment or the technical solutions of the prior art, the drawings that are required for the description of the embodiment or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling particulate matter filtration efficiency according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a process for determining a timing for performing a heat calculation according to an embodiment of the present application;
FIG. 3 is a schematic illustration of a process for controlling a particulate trap to increase the primary emission of unburned soot according to an embodiment of the present application;
FIG. 4 is a flow chart of another method for controlling particulate matter filtration efficiency according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a particulate filtering efficiency control device according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating another apparatus for controlling particulate filtering efficiency according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another particulate filtering efficiency control device according to an embodiment of the present application.
Detailed Description
Particulate traps are used to trap engine particulates, thereby reducing the amount of dust emitted to the atmosphere. According to the regulation requirements, the emission of the after-treatment particulate matters is monitored in real time. Before ash deposition does not occur in the fresh particulate matter catcher, and the carbon layer is damaged due to the fact that the fresh particulate matter catcher is subjected to high-temperature passive regeneration, the filtering efficiency is reduced, and the risk of exceeding the standard exists in particulate matter emission.
However, the prior art does not have a mature solution to cope with the problem that the emission of particulate matters is at an excessive risk, and the inventor considers that the carbon layer is damaged when the fresh particulate matter trap is subjected to passive regeneration at high temperature before ash deposition is not generated, so that the filtration efficiency of the particulate matters is reduced. If the time of passive regeneration of the particulate matter catcher can be predicted, measures are taken in advance to prevent the damage of the carbon layer caused by the passive regeneration, the problem of reduced particulate matter filtering efficiency can not occur, and further, the exceeding of particulate matter emission is avoided.
Therefore, the inventor judges the moment that unburned soot in the particle catcher is about to be passively regenerated through the heat provided when the engine exhaust gas flows through the particle catcher, measures are taken to avoid the damage of a carbon layer caused by passive regeneration after the moment that the unburned soot in the particle catcher is about to be passively regenerated is obtained, and further the reduction of the filtering efficiency of the particles is avoided, so that the problem that the exceeding risk exists in the emission of the particles in the prior art is solved.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Before introducing the methods, the following related art will be described first to facilitate the reader's reading and understanding of the schemes of the present application.
Particulate matter trapping (Diesel Particulate Filter, DPF) technology filters and traps particulates in engine exhaust mainly through diffusion, deposition and impact mechanisms. The exhaust gas flows through the trap where particles are trapped in the filter element of the filter body, leaving cleaner exhaust gas to be discharged into the atmosphere. The wall-flow honeycomb ceramic filter is mainly used for engineering machinery and urban buses at present, and is characterized by simple operation and high filtering efficiency, but has the problems of regeneration of the filter and sensitivity to sulfur components in fuel oil.
The basic working principle of the particulate matter trapping system is as follows: when engine exhaust gas flows through an oxidation catalyst (DOC), at a temperature of 200-600 ℃, CO and HC are first almost entirely oxidized to CO2 and H2O, while NO is converted to NO2. After the exhaust gas comes out of the DOC and enters a particle catcher (DPF), the particles are caught in a filter element of a filter body, cleaner exhaust gas is left to be discharged into the atmosphere, and the catching efficiency of the DPF can reach more than 90 percent.
The exhaust particulate matter of an engine mainly comprises two components: unburned Soot (Soot), ash (ash), where particulate emissions are mostly composed of tiny particles of carbon and carbide.
With the lengthening of the working time, more and more particulate matters are accumulated on the DPF, so that the filtering effect of the DPF is affected, the exhaust back pressure is increased, the ventilation and combustion of an engine are affected, the power output is reduced, the oil consumption is increased, and therefore, how to timely eliminate the particulate matters on the DPF (DPF regeneration) is the key of the technology. The DPF regeneration is to recover the filtering performance of the DPF by periodically removing deposited particulate matter because the engine performance is lowered due to an increase in engine back pressure caused by a gradual increase in particulate matter in the trap during long-term operation of the DPF.
DPF regeneration has two methods, active regeneration and passive regeneration: active regeneration refers to the use of external energy to raise the temperature within the DPF to ignite and burn the particulate matter. When the differential pressure sensor detects that the back pressure of the DPF is overlarge, the accumulated carbon quantity carried by the DPF is considered to be reached, and the temperature in the DPF is increased by external energy, such as diesel oil injection and combustion before the DOC, so that the temperature in the DPF reaches a certain temperature, deposited particles are oxidized and combusted, and the purpose of regeneration is achieved. The DPF temperature rises above 550 ℃ to burn the trapped particulates therein and thereby restore the trapping ability of the DPF. Passive regeneration means that NO2 in the tail gas has strong oxidizing ability to the trapped particles in a certain temperature interval, so that NO2 can be used as an oxidizing agent to remove particles in the particle trap, CO2 is generated, and NO2 is reduced to NO, thereby achieving the purpose of removing particles. The passive regeneration does not need extra fuel, so the more times the passive regeneration is performed in the life cycle of the DPF, the longer the period of active regeneration is needed, and the less fuel is consumed by the aftertreatment system, so the overall fuel consumption of the engine is improved.
However, the carbon layer of the DPF is possibly damaged by passive regeneration, and the method adopts measures to avoid the damage of the carbon layer by predicting the impending moment of the damage of the carbon layer caused by the passive regeneration, and the specific scheme is as follows:
referring to fig. 1, fig. 1 is a flowchart of a method for controlling particulate filtering efficiency according to an embodiment of the present application, where the method includes:
and S101, determining the time for carrying out heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas.
Because the embodiment of the application judges the timing of the impending passive regeneration of unburned soot in the particulate matter trap by the heat provided when the exhaust gas of the engine flows through the particulate matter trap, the timing of the heat calculation is also required to be determined. The timing for performing the heat calculation based on the particulate trap temperature and the exhaust mass flow may be determined in two ways:
in the first mode, it may be determined whether the upstream temperature of the particulate matter trap exceeds a certain threshold T1, where T1 may take a value between 300 ℃ and 350 ℃, and the specific value is set according to the actual situation. If it exceeds, it is considered that the timing for performing the heat calculation is satisfied.
In the second mode, whether the exhaust gas mass flow is larger than a certain threshold value M1 can be judged, and the M1 can be larger than a numerical value under a normal working condition, and the specific numerical value is set according to the actual condition. If the exhaust gas mass flow is greater than a certain threshold M1 and at the same time the upstream temperature of the particulate matter trap exceeds T2, it is considered that the condition for performing the heat calculation is satisfied at this point, i.e., at this point is the time for performing the heat calculation. Where T2< T1, and T2 is the lowest temperature at which passive regeneration can occur.
The process of determining the timing of performing heat calculation is shown in fig. 2, and fig. 2 is a schematic diagram of a process of determining the timing of performing heat calculation according to an embodiment of the present application.
The time for carrying out heat calculation is determined by the temperature of the particulate matter catcher and the mass flow of the waste gas, so that the subsequent time for judging the passive regeneration of the particulate matter catcher according to the heat calculation can be conveniently determined.
S102, performing heat calculation at the moment according to the temperature of the particulate matter trap and the mass flow of the exhaust gas to obtain a first result.
And when the condition for carrying out heat calculation is met, carrying out heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas at the moment of carrying out heat calculation to obtain a first result Q. Before heat calculation is carried out, the current engine exhaust specific heat capacity c is required to be inquired according to an engine working condition table, then the exhaust mass flow q and the particulate matter trap temperature T are subjected to double integration to obtain a first result, and an integration formula is as follows:
Q＝∫∫cq(t)T(t)dt2。
s103, if the first result meets a first condition or a second condition, controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold. The first threshold and the second threshold are valued according to actual conditions.
If the accumulated heat Q satisfies the first condition, that is, if the accumulated heat Q exceeds the threshold, the original discharge amount of unburned soot is increased by adjusting the rail pressure, the advance angle, the intake air amount, etc., to maintain the filtration efficiency of particulate matter.
If the accumulated heat quantity Q satisfies a second condition, that is, the rate of change of the accumulated heat quantity Q exceeds a certain set threshold, the raw discharge amount of unburned soot is increased to maintain the filtration efficiency of particulate matter.
The above-mentioned judging process is shown in fig. 3, and fig. 3 is a schematic diagram of a process for controlling the particulate matter trap to increase the original discharge amount of unburned carbon smoke according to the embodiment of the present application.
By judging whether the accumulated heat Q exceeds a threshold value or judging whether the accumulated heat Q is accumulated to a higher heat in a short time, namely, the change rate of the heat Q exceeds a certain set threshold value, the original discharge capacity of unburned carbon smoke is improved, so that the damage of a carbon layer caused by passive regeneration of the particulate matter catcher is avoided, the filtering efficiency of particulate matters is maintained, and the problem that the discharge of the particulate matters has an exceeding risk in the prior art is solved.
The embodiment of the application provides a particulate matter filtering efficiency control method. When the method is executed, the time for carrying out heat calculation is firstly determined according to the temperature of the particulate matter catcher and the mass flow of the exhaust gas, and when the time for carrying out heat calculation is met, the first result is obtained by carrying out heat calculation according to the temperature of the particulate matter catcher and the mass flow of the exhaust gas; if the first result meets the first condition or the second condition, controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke and keep the particulate matter filtering efficiency; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold. Therefore, the moment of reducing the particulate filtering efficiency is judged by carrying out heat calculation according to the temperature of the particulate trap and the mass flow of the exhaust gas, the particulate trap is controlled in advance to improve the original discharge amount of unburned carbon smoke, and the reduction of the particulate filtering efficiency is avoided. Therefore, the problem that the exceeding risk exists in particulate matter emission in the prior art is solved.
In an alternative embodiment of the present application, after determining the timing of performing the heat calculation, the first timer and the second timer, that is, the timer 1 and the timer 2, may be enabled when performing the heat calculation; because the temperature of the particulate matter trap and the mass flow of the exhaust gas are variable, the condition for carrying out heat calculation may be satisfied at the previous moment, but not satisfied at the next moment; on the one hand, the instant when the particulate matter trap is about to be passively regenerated is judged by judging whether the accumulated heat Q exceeds the preset value; on the other hand, judging the moment when the particulate matter trap is about to be passively regenerated by judging whether the change rate of the accumulated heat Q exceeds a certain set threshold value; this means that the heat calculation is a process that includes a timing at which the heat calculation is satisfied, and a timing at which the heat calculation is not satisfied. Whereby the timer 2 can be caused to count up the time of the whole process to obtain t2, which time includes the time satisfying the heat calculation and also includes the time not satisfying the heat calculation; when the calculation of the heat is not satisfied, the timer 1 is timed to obtain t1, that is, the timer 1 only records the time when the calculation of the heat is not satisfied.
When the ratio of timer 1 to timer 2And when the heat quantity Q does not exceed the threshold value, clearing heat quantity accumulated in the t2 time period, and carrying out heat quantity accumulation again. Wherein alpha is set according to the actual situation.
Therefore, the moment when the particulate matter catcher is about to be passively regenerated can be accurately determined, and further the damage to the carbon layer caused by the passive regeneration of the particulate matter catcher can be avoided.
In alternative embodiments of the application, the inventors contemplate that after replacement and cleaning of the particulate trap, or when fresh particulate trap ash is below a certain threshold, this threshold may be set according to the actual situation where passive regeneration would occur to damage the carbon layer. Therefore, the method provided by the embodiment of the application needs to judge the passive regeneration occurrence time and take measures for preventing the filtration efficiency after replacing and cleaning the particle catcher or when the ash content of the fresh particle catcher is smaller than a certain threshold value.
As shown in fig. 4, fig. 4 is a flowchart of another method for controlling the filtration efficiency of particulate matter according to an embodiment of the present application.
According to the method provided by the embodiment of the application, whether the particulate matter catcher is replaced and cleaned or whether ash in the particulate matter catcher is smaller than the preset threshold value is firstly judged, and when any one of the two is met, the risk of exceeding the standard of particulate matter filtration is judged, so that particulate matter efficiency reduction opportunity prediction is carried out. Judging the time for carrying out heat calculation by judging whether the temperature of the particulate matter catcher and the mass flow of the waste gas meet the condition for carrying out heat calculation or not; and whether the accumulated heat Q and the change rate of the accumulated heat Q exceed a threshold value or not is judged, so that the moment of carbon layer damage caused by passive regeneration of the particulate matter catcher is judged, and then the original discharge capacity of unburned carbon smoke is improved, so that the carbon layer damage caused by passive regeneration of the particulate matter catcher is avoided, the filtering efficiency of particulate matters is maintained, and the problem that the discharge of the particulate matters has the exceeding risk in the prior art is solved.
The embodiments of the present application provide some specific implementation manners of a particulate matter filtering efficiency control method, and based on this, the present application further provides a corresponding particulate matter filtering efficiency control device. The apparatus provided by the embodiment of the present application will be described in terms of functional modularization.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a particulate matter filtering efficiency control device according to an embodiment of the present application, where the device includes a timing determining module 501, a calculating module 502, and a control module 503;
the timing determining module 501 is configured to determine a timing for performing heat calculation according to a temperature of the particulate matter trap and a mass flow of exhaust gas;
the calculating module 502 is configured to calculate heat at the opportunity according to the temperature of the particulate matter trap and the mass flow of the exhaust gas to obtain a first result;
the control module 503 is configured to control the particulate matter trap to increase the primary emission of unburned soot if the first result meets a first condition or a second condition; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold.
The embodiment of the application provides a particulate matter filtering efficiency control device. The method comprises the steps of executing a particulate matter filtering efficiency control method, determining the time for carrying out heat calculation according to the temperature of a particulate matter trap and the mass flow of exhaust gas when the method is executed, and carrying out heat calculation according to the temperature of the particulate matter trap and the mass flow of exhaust gas when the time for carrying out heat calculation is met to obtain a first result; if the first result meets the first condition or the second condition, controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke and keep the particulate matter filtering efficiency; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold. Therefore, the moment of reducing the particulate filtering efficiency is judged by carrying out heat calculation according to the temperature of the particulate trap and the mass flow of the exhaust gas, the particulate trap is controlled in advance to improve the original discharge amount of unburned carbon smoke, and the reduction of the particulate filtering efficiency is avoided. Therefore, the problem that the exceeding risk exists in particulate matter emission in the prior art is solved.
Further, the timing determining module 501 is specifically configured to:
determining a timing at which the upstream temperature of the particulate matter trap is greater than a third threshold, or at which the exhaust mass flow is greater than a fourth threshold and the upstream temperature of the particulate matter trap is greater than a fifth threshold as a timing at which a heat calculation is performed; the fifth threshold is less than the third threshold, and the fifth threshold is a lowest temperature at which passive regeneration of the particulate trap occurs.
Further, the computing module 502 is specifically configured to:
and performing double integration on the temperature of the particulate matter trap and the exhaust gas mass flow to obtain the first result.
Referring to fig. 6, fig. 6 is a schematic structural diagram of another particulate filtering efficiency control device according to an embodiment of the present application, where the device further includes a timing module 504, and the timing module 504 is specifically configured to:
enabling a first timer and a second timer respectively when heat calculation is started, and keeping the current accumulated time by the first timer when the first result does not meet a first condition or a second condition;
and when the ratio of the timing data of the first timer to the timing data of the second timer is smaller than a preset value and the first result does not meet the first condition, clearing the heat calculation data and carrying out heat calculation again.
Referring to fig. 7, fig. 7 is a schematic structural diagram of still another particulate filtering efficiency control device according to an embodiment of the present application, where the device further includes an execution module 505, and the execution module 505 is specifically configured to:
the timing determination module, the calculation module, and the control module are triggered to operate after the particulate trap is replaced or cleaned, or when ash in the particulate trap is less than a seventh threshold, the timing determination module, the calculation module, and the control module are triggered to operate. The "first" and "second" in the names of the "first threshold", "second threshold", and the like in the embodiments of the present application are used for name identification, and do not represent the first and second in sequence.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus general hardware platforms. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to perform the method according to the embodiments or some parts of the embodiments of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
The foregoing description of the exemplary embodiments of the application is merely illustrative of the application and is not intended to limit the scope of the application.
Claims (10)
1. A particulate matter filtration efficiency control method, the method comprising:
determining the time for carrying out heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas;
performing heat calculation at the moment according to the temperature of the particulate matter trap and the exhaust gas mass flow to obtain a first result;
if the first result meets the first condition or the second condition, controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold.
2. The method according to claim 1, wherein the timing for performing the heat calculation is determined according to the temperature of the particulate matter trap and the mass flow of the exhaust gas, specifically comprising:
determining a timing at which the upstream temperature of the particulate matter trap is greater than a third threshold, or at which the exhaust mass flow is greater than a fourth threshold and the upstream temperature of the particulate matter trap is greater than a fifth threshold as a timing at which a heat calculation is performed; the fifth threshold is less than the third threshold, and the fifth threshold is a lowest temperature at which passive regeneration of the particulate trap occurs.
3. The method of claim 1, wherein the calculating the heat from the particulate trap temperature and the exhaust gas mass flow provides a first result, comprising:
and performing double integration on the temperature of the particulate matter trap and the exhaust gas mass flow to obtain the first result.
4. The method of claim 1, further comprising, after the timing for the heat calculation based on the particulate trap temperature and the exhaust mass flow rate determination:
enabling a first timer and a second timer respectively when heat calculation is started, and keeping the current accumulated time by the first timer when the first result does not meet a first condition or a second condition;
and when the ratio of the timing data of the first timer to the timing data of the second timer is smaller than a preset value and the first result does not meet the first condition, clearing the heat calculation data and carrying out heat calculation again.
5. The method of any one of claims 1-4, wherein the method is performed after replacing or cleaning the particulate trap or when ash in the particulate trap is less than a seventh threshold.
6. A particulate matter filtration efficiency control device, the device comprising: the device comprises a timing determining module, a calculating module and a control module;
the timing determining module is used for determining the timing of heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas;
the calculation module is used for calculating heat according to the temperature of the particulate matter catcher and the mass flow of the waste gas at the moment to obtain a first result;
the control module is used for controlling the particulate matter trap to improve the original discharge capacity of unburned carbon smoke if the first result meets a first condition or a second condition; the first condition is that the first result exceeds a first threshold; the second condition is that the rate of change of the first result exceeds a second threshold.
7. The apparatus of claim 6, wherein the timing determination module is configured to:
determining a timing at which the upstream temperature of the particulate matter trap is greater than a third threshold, or at which the exhaust mass flow is greater than a fourth threshold and the upstream temperature of the particulate matter trap is greater than a fifth threshold as a timing at which a heat calculation is performed; the fifth threshold is less than the third threshold, and the fifth threshold is a lowest temperature at which passive regeneration of the particulate trap occurs.
8. The apparatus according to claim 6, wherein the computing module is specifically configured to:
and performing double integration on the temperature of the particulate matter trap and the exhaust gas mass flow to obtain the first result.
9. The apparatus of claim 6, further comprising a timing module, in particular for:
enabling a first timer and a second timer respectively when heat calculation is started, and keeping the current accumulated time by the first timer when the first result does not meet a first condition or a second condition;
and when the ratio of the timing data of the first timer to the timing data of the second timer is smaller than a preset value and the first result does not meet the first condition, clearing the heat calculation data and carrying out heat calculation again.
10. The apparatus according to any one of claims 6-9, further comprising an execution module, in particular for:
the timing determination module, the calculation module, and the control module are triggered to operate after the particulate trap is replaced or cleaned, or when ash in the particulate trap is less than a seventh threshold, the timing determination module, the calculation module, and the control module are triggered to operate.
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| CN116146366A (en) * | 2023-04-17 | 2023-05-23 | 潍柴动力股份有限公司 | Control method and device for regeneration rate |
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