CN114961927A - Particulate matter filtering efficiency control method and device - Google Patents
Particulate matter filtering efficiency control method and device Download PDFInfo
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- 239000013618 particulate matter Substances 0.000 title claims abstract description 158
- 238000001914 filtration Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000004071 soot Substances 0.000 claims abstract description 23
- 230000008929 regeneration Effects 0.000 claims description 37
- 238000011069 regeneration method Methods 0.000 claims description 37
- 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 2
- 239000007789 gas Substances 0.000 description 34
- 230000001276 controlling effect Effects 0.000 description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 17
- 229910052799 carbon Inorganic materials 0.000 description 17
- 238000010586 diagram Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 239000000428 dust Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 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
- 230000008021 deposition Effects 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
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001172 regenerating 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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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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)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The application provides a method and a device for controlling the filtering efficiency of particulate matters. Firstly, determining the time for calculating heat according to the temperature of the particulate matter trap and the mass flow of the exhaust gas, and when the time for calculating heat is met, performing heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas 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 soot 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. Like this, carry out heat calculation through carrying out according to particulate matter trap temperature and exhaust mass flow, judge the moment that particulate matter filtration efficiency reduces, control in advance the particulate matter trap improves the former discharge capacity of the soot of not burning, has avoided the emergence that particulate matter filtration efficiency reduces. From this, solved among the prior art particulate matter emission and had the problem of risk that exceeds standard.
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. The aftertreatment particulate matter emissions are monitored in real time according to regulatory requirements. Before no dust is deposited on the fresh particulate matter catcher, the carbon layer is damaged due to passive regeneration when the fresh particulate matter catcher meets high temperature, the filtering efficiency is reduced, and the excessive risk exists in the particulate matter emission.
The prior art does not have a mature scheme for solving the problem that the excessive risk exists in the emission of the particulate matters.
Disclosure of Invention
In view of this, the embodiment of the present application provides a method and an apparatus for controlling particulate matter filtering efficiency, and aims to solve the problem that the excessive risk exists in particulate matter emission in the prior art.
In a first aspect, an embodiment of the present application provides a method for controlling particulate matter filtering efficiency, where the method includes:
determining the time for calculating heat according to the temperature of the particulate matter trap and the mass flow of the exhaust gas;
performing heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas at the moment to obtain a first result;
if the first result meets a first condition or a second condition, controlling the particulate matter trap to increase the original discharge capacity of unburned soot; the first condition is that the first result exceeds a first threshold; the second condition is that a rate of change of the first result exceeds a second threshold.
Optionally, the determining the time for performing the heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas specifically includes:
determining the moment when the upstream temperature of the particulate matter trap is larger than a third threshold value or the moment when the exhaust gas mass flow is larger than a fourth threshold value and the upstream temperature of the particulate matter trap is larger than a fifth threshold value as the moment when the heat quantity is calculated; the fifth threshold is less than the third threshold, and the fifth threshold is a minimum temperature at which passive regeneration of the particulate trap occurs.
Optionally, the performing heat calculation according to the temperature of the particulate matter trap and the exhaust gas mass flow to obtain a first result specifically includes:
and performing double integration on the temperature of the particulate matter catcher and the mass flow of the exhaust gas to obtain the first result.
Optionally, after determining the timing for performing the heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas, the method further includes:
when the heat calculation is started, enabling a first timer and a second timer respectively, and when the first result does not meet a first condition or a second condition, keeping the current accumulated time by the first timer;
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 a 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, embodiments of the present application provide a particulate matter filtration efficiency control apparatus, the apparatus including: the timing control device comprises a timing determination module, a calculation module and a control module;
the opportunity determination module is used for determining the opportunity for 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 carrying out heat calculation according to the temperature of the particulate matter catcher and the mass flow of the exhaust 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 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 a rate of change of the first result exceeds a second threshold.
Optionally, the timing determining module is specifically configured to:
determining the moment when the upstream temperature of the particulate matter catcher is larger than a third threshold value or the moment when the exhaust gas mass flow is larger than a fourth threshold value and the upstream temperature of the particulate matter catcher is larger than a fifth threshold value as the moment when the heat quantity calculation is carried out; the fifth threshold is less than the third threshold, and the fifth threshold is a minimum temperature at which passive regeneration of the particulate trap occurs.
Optionally, the calculation module is specifically configured to:
and performing double integration on the temperature of the particulate matter catcher and the mass flow of the exhaust gas to obtain the first result.
Optionally, the apparatus further includes a timing module, where the timing module is specifically configured to:
when the heat calculation is started, enabling a first timer and a second timer respectively, and when the first result does not meet a first condition or a second condition, keeping the current accumulated time by the first timer;
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 a first condition, clearing the heat calculation data and carrying out heat calculation again.
Optionally, the apparatus further includes an execution module, where the execution module is specifically configured to:
the timing determination module, the calculation module and the control module are triggered to work after the particulate matter trap is replaced or cleaned, or the timing determination module, the calculation module and the control module are triggered to work when ash content in the particulate matter trap is smaller than a seventh threshold value.
The embodiment of the application provides a method and a device for controlling the filtering efficiency of particulate matters. When the method is executed, firstly, 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, and when the time 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 to obtain a first result; 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 soot and keep the particulate matter filtering efficiency; the first condition is that the first result exceeds a first threshold; the second condition is that a rate of change of the first result exceeds a second threshold. Like this, through according to particulate matter trap temperature with exhaust mass flow carries out the heat and calculates, judges the moment that particulate matter filtration efficiency reduces, controls in advance particulate matter trap improves the former discharge capacity of the soot of unburned, has avoided the emergence that particulate matter filtration efficiency reduces. From this, solved among the prior art particulate matter emission and had the problem of risk that exceeds standard.
Drawings
To illustrate the technical solutions in the present embodiment or the prior art more clearly, the drawings needed to be used in the description of the embodiment or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling particulate matter filtration efficiency according to an embodiment of the present disclosure;
fig. 2 is a schematic process diagram for determining an opportunity for performing a heat calculation according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a process for controlling a particulate trap to increase the raw displacement of unburned soot according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of another method for controlling particulate matter filtration efficiency provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of a particulate matter filtering efficiency control device according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of another particulate matter filtering efficiency control device according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another particulate matter 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. The aftertreatment particulate matter emissions are monitored in real time according to regulatory requirements. Before no dust is deposited on the fresh particulate matter catcher, the carbon layer is damaged due to passive regeneration when the fresh particulate matter catcher meets high temperature, the filtering efficiency is reduced, and the excessive risk exists in the particulate matter emission.
In view of the problem that the existing technology does not have a mature scheme for dealing with the excessive risk of particulate matter emission, the inventor considers that a carbon layer is damaged due to passive regeneration when a fresh particulate matter trap is subjected to high temperature before no dust is deposited, and therefore the particulate matter filtering efficiency is reduced. If the occasion of the passive regeneration of the particulate matter trap can be predicted, the problem of reduction of the particulate matter filtering efficiency can not occur due to the fact that measures are taken in advance to prevent the damage of a carbon layer caused by the passive regeneration, and therefore the emission of the particulate matter is prevented from exceeding the standard.
Therefore, the heat provided by the inventor when the engine exhaust flows through the particulate matter trap is used for judging the time when the unburned carbon smoke in the particulate matter trap is about to generate the passive regeneration, and after the time when the unburned carbon smoke in the particulate matter trap is about to generate the passive regeneration is obtained, measures are taken to avoid the damage of a carbon layer caused by the passive regeneration, so that the reduction of the particulate matter filtering efficiency is avoided, and the problem that the excessive risk exists in the particulate matter emission in the prior art is solved.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and 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.
Prior to introducing the methods, the following art-related techniques are first introduced to facilitate the reader's reading and understanding of the present application.
The Particulate matter trapping (DPF) technology filters and traps Particulate matter in engine exhaust primarily through diffusion, deposition and impaction mechanisms. As the exhaust gas flows through the trap, particles are trapped within the filter element of the filter body, leaving a cleaner exhaust gas to be discharged into the atmosphere. The wall flow type 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 filter regeneration and sensitivity to sulfur components in fuel.
The basic working principle of the particulate matter trapping system is as follows: when the engine exhaust stream is over-oxidized over a catalyst (DOC), CO and HC are first almost completely oxidized to CO2 and H2O, while NO is converted to NO2 at 200-600 deg.C temperature conditions. After the exhaust gas enters a particle trap (DPF) from the DOC, particles are trapped in a filter element of the filter body, the residual cleaner exhaust gas is discharged into the atmosphere, and the trapping efficiency of the DPF can reach more than 90%.
Exhaust particulates of an engine mainly contain two components: unburned Soot (Soot), ash (ash), where particulate emissions are mostly composed of tiny particles of carbon and carbides.
Along with the extension of operating time, the particulate matter that piles up on the DPF is more and more, not only influences the filter effect of DPF, still can increase exhaust backpressure to influence the taking a breath and the burning of engine, lead to power output to reduce, the oil consumption increases, so how to eliminate particulate matter on the DPF in time (DPF regeneration) is the key of this technique. DPF regeneration refers to the periodic removal of deposited particulate matter to restore the filtering performance of a DPF, since the increase in particulate matter in the trap during long-term operation of the DPF leads to an increase in engine back pressure and a decrease in engine performance.
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 pressure difference sensors before and after the DPF detect that the back pressure before and after the DPF is too large, the carbon accumulation amount which can be carried by the DPF is considered to be reached, and at the moment, the temperature in the DPF is increased through external energy, such as diesel oil which is injected and combusted in front of DOC, so that the temperature in the DPF reaches a certain temperature, and deposited particulate matters can be oxidized and combusted, thereby achieving the aim of regeneration. The DPF temperature rises to 550 ℃ or higher to burn the particulates trapped therein and recover the trapping ability of the DPF. The passive regeneration means that NO2 in the exhaust has strong oxidizing ability to the trapped particles within a certain temperature range, so that NO2 can be used as an oxidizing agent to remove the particles in the particle trap and generate CO2, and NO2 is reduced to NO, thereby achieving the purpose of removing the particles. The passive regeneration does not require additional fuel, so that the more times the passive regeneration is performed, the longer the period for which the active regeneration is required, and the less fuel is consumed by the aftertreatment system during the DPF life cycle, thereby improving the overall fuel consumption of the engine.
However, passive regeneration may cause damage to a carbon layer of the DPF, and the present application takes measures to avoid damage to the carbon layer by predicting the imminent occurrence of damage to the carbon layer caused by passive regeneration, and the specific scheme is as follows:
referring to fig. 1, fig. 1 is a flowchart of a method for controlling particulate matter filtering efficiency according to an embodiment of the present application, where the method includes:
s101, determining the time for calculating the heat 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 time when the unburned soot in the particulate trap is about to generate the passive regeneration by the heat provided when the engine exhaust gas flows through the particulate trap, the time for calculating the heat also needs to be determined. There are two ways to determine when to perform a thermal calculation based on particulate trap temperature and exhaust mass flow:
in the first mode, whether the upstream temperature of the particulate matter trap exceeds a certain threshold value T1 or not can be judged, and the value T1 can be 300-350 ℃, and the specific value is set according to the actual situation. If so, the timing for performing the heat calculation is considered to be satisfied at this time.
In the second mode, whether the exhaust gas mass flow is larger than a certain threshold value M1 or not can be judged, M1 can be larger than a value under a normal working condition, and the specific value is set according to an actual condition. If the exhaust gas mass flow is greater than a certain threshold value M1 and at the same time the temperature upstream of the particle trap exceeds T2, the condition for performing a heat calculation is considered to be fulfilled at the moment, i.e. at the moment when the heat calculation is performed. Wherein T2< T1, and T2 is the lowest temperature at which passive regeneration can occur.
Fig. 2 shows a process of determining a timing for performing heat quantity calculation, and fig. 2 is a schematic process diagram of determining a timing for performing heat quantity calculation according to an embodiment of the present application.
The time for calculating the heat quantity is determined by the temperature of the particulate matter trap and the mass flow of the waste gas, so that the time for passively regenerating the particulate matter trap can be conveniently judged according to the heat quantity calculation in the follow-up process.
And 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 of 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, the specific heat capacity c of the exhaust gas of the current engine needs to be obtained by inquiring according to an engine working condition table, then double integration is carried out on the mass flow q of the exhaust gas and the temperature T of the particulate matter catcher to obtain a first result, and the 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 soot; the first condition is that the first result exceeds a first threshold; the second condition is that a rate of change of the first result exceeds a second threshold. The first threshold value and the second threshold value are valued according to actual conditions.
If the accumulated heat Q satisfies the first condition, that is, if the accumulated heat Q exceeds a threshold, the original discharge amount of unburned soot is increased by adjusting the rail pressure, the advance angle, the intake air amount, and the like, so as to maintain the filtering efficiency of particulate matter.
If the accumulated heat Q satisfies the second condition, that is, the rate of change of the accumulated heat Q exceeds a certain set threshold, the raw discharge amount of unburned soot is increased to maintain the filtering efficiency of particulate matter.
The above determination process is shown in fig. 3, and fig. 3 is a schematic diagram of a process for controlling a particulate matter trap to increase the raw displacement of unburned soot according to an embodiment of the present disclosure.
Whether accumulated heat Q exceeds a threshold value or not is judged, or when higher heat is accumulated in a short time, namely the change rate of the heat Q exceeds a certain set threshold value, the original discharge capacity of unburned soot is improved, so that the damage to a carbon layer caused by passive regeneration of a particulate matter trap is avoided, the filtering efficiency of the particulate matter is kept, and the problem that the excessive risk exists in the particulate matter discharge in the prior art is solved.
The embodiment of the application provides a particulate matter filtering efficiency control method. When the method is executed, firstly, 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, and when the time 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 to obtain a first result; 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 soot and keep the particulate matter filtering efficiency; the first condition is that the first result exceeds a first threshold; the second condition is that a rate of change of the first result exceeds a second threshold. Like this, through according to particulate matter trap temperature with exhaust mass flow carries out the heat and calculates, judges the moment that particulate matter filtration efficiency reduces, controls in advance particulate matter trap improves the former discharge capacity of the soot of unburned, has avoided the emergence that particulate matter filtration efficiency reduces. From this, solved among the prior art particulate matter emission and had the problem of risk that exceeds standard.
In an alternative embodiment of the present application, after the timing for performing the heat calculation is determined, when performing the heat calculation, the first timer and the second timer, that is, the timer 1 and the timer 2, may be enabled; because the temperature of the particulate matter trap and the mass flow of the exhaust gas are changed, the condition for carrying out heat calculation can be met at the last moment, and the condition can not be met at the next moment; on one hand, the moment when the particulate matter trap is about to generate passive regeneration is judged by judging whether the accumulated heat Q exceeds; on the other hand, the time when the particulate matter trap is about to generate passive regeneration is judged by judging whether the change rate of the accumulated heat Q exceeds a certain set threshold value; this means that the calculation of the heat amount is a process, and the process includes a timing that satisfies the calculation of the heat amount and a timing that does not satisfy the calculation of the heat amount. Thus, the timer 2 can accumulate the time for counting the whole process to obtain t2, where the time includes the time that satisfies the thermal calculation and the time that does not satisfy the thermal calculation; when the heat calculation is not satisfied, the timer 1 is timed to t1, that is, the timer 1 records only the time that is not satisfied with the heat calculation.
When ratio of timer 1 to timer 2
And when the heat quantity Q does not exceed the threshold value, clearing the heat quantity accumulated in the time period of t2, and carrying out heat quantity accumulation again. Wherein alpha is set according to actual conditions.
Therefore, the time when the particulate matter trap is about to be passively regenerated can be determined more accurately, and further damage to a carbon layer caused by passive regeneration of the particulate matter trap can be avoided.
In alternative embodiments of the present application, the present inventors contemplate that after the particulate trap is replaced and cleaned, or when the fresh particulate trap ash is less than a threshold, the threshold may be set as a practical matter, in both cases destroying the carbon layer when passive regeneration occurs. Therefore, the method provided by the embodiment of the application needs to judge the occurrence time of passive regeneration after the particulate matter trap is replaced and cleaned or when the ash content of the fresh particulate matter trap is smaller than a certain threshold value, and takes a measure for preventing the filtration efficiency.
As shown in fig. 4, fig. 4 is a flow chart of another method for controlling the filtering efficiency of particulate matter according to the embodiment of the present application.
The method provided by the embodiment of the application comprises the steps of firstly judging whether the particulate matter trap is replaced and cleaned or not, or judging whether ash in the particulate matter trap is smaller than a preset threshold value or not, judging whether the particulate matter filtering has an overproof risk when any one of the particulate matter trap and the particulate matter trap is met, and then predicting when the particulate matter efficiency is reduced. Judging the time for calculating the heat quantity by judging whether the temperature of the particulate matter trap and the mass flow of the waste gas meet the condition for calculating the heat quantity; whether the change rate of the accumulated heat Q and the accumulated heat Q exceeds a threshold value or not is judged, the moment when the particulate matter trap is subjected to passive regeneration to cause the damage of the carbon layer is further judged, the original discharge capacity of unburned soot is improved, the damage of the carbon layer caused by the passive regeneration of the particulate matter trap is avoided, the filtering efficiency of particulate matters is kept, and the problem that the excessive risk exists in the particulate matter discharge in the prior art is solved.
The above embodiments of the method for controlling the filtering efficiency of particulate matter are provided, and based on this, a corresponding device for controlling the filtering efficiency of particulate matter is also provided. The device provided by the embodiment of the present application will be described in terms of functional modularity.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a particulate matter filtering efficiency control apparatus provided in an embodiment of the present application, where the apparatus includes a timing determination module 501, a calculation module 502, and a control module 503;
the timing determination module 501 is configured to determine a timing for performing heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas;
the calculation module 502 is configured to perform a heat calculation according to the temperature of the particulate matter trap and the exhaust gas mass flow at the time to obtain a first result;
the control module 503 is configured to control the particulate matter trap to increase the original discharge amount 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 a rate of change of the first result exceeds a second threshold.
The embodiment of the application provides a particulate matter filtration efficiency controlling means. The method is used for executing the particulate matter filtering efficiency control method, when the method is executed, firstly, the time for carrying out heat calculation is determined according to the temperature of the particulate matter trap and the mass flow of the exhaust gas, and when the time for carrying out heat calculation is met, the heat calculation is carried out according to the temperature of the particulate matter trap and the mass flow of the exhaust gas to obtain a first result; 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 soot and keep the particulate matter filtering efficiency; the first condition is that the first result exceeds a first threshold; the second condition is that a rate of change of the first result exceeds a second threshold. Like this, through according to particulate matter trap temperature with exhaust mass flow carries out the heat and calculates, judges the moment that particulate matter filtration efficiency reduces, controls in advance particulate matter trap improves the former discharge capacity of the soot of unburned, has avoided the emergence that particulate matter filtration efficiency reduces. From this, solved among the prior art particulate matter emission and had the problem of risk that exceeds standard.
Further, the timing determining module 501 is specifically configured to:
determining the moment when the upstream temperature of the particulate matter catcher is larger than a third threshold value or the moment when the exhaust gas mass flow is larger than a fourth threshold value and the upstream temperature of the particulate matter catcher is larger than a fifth threshold value as the moment when the heat quantity calculation is carried out; the fifth threshold is less than the third threshold, and the fifth threshold is a minimum temperature at which passive regeneration of the particulate trap occurs.
Further, the calculating module 502 is specifically configured to:
and performing double integration on the temperature of the particulate matter catcher and the mass flow of the exhaust gas to obtain the first result.
Referring to fig. 6, fig. 6 is a schematic structural diagram of another particulate matter filtering efficiency control apparatus provided in an embodiment of the present application, where the apparatus further includes a timing module 504, and the timing module 504 is specifically configured to:
when the heat calculation is started, enabling a first timer and a second timer respectively, and when the first result does not meet a first condition or a second condition, keeping the current accumulated time by the first timer;
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 a 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 another particulate matter filtering efficiency control apparatus provided in an embodiment of the present application, the apparatus further includes an executing module 505, where the executing module 505 is specifically configured to:
the timing determination module, the calculation module and the control module are triggered to work after the particulate matter trap is replaced or cleaned, or the timing determination module, the calculation module and the control module are triggered to work when ash content in the particulate matter trap is smaller than a seventh threshold value. In the embodiments of the present application, the names "first" and "second" in the "first threshold", "second threshold", and the like are used for name identification, and do not represent the first and second in sequence.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a general hardware platform. 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 enabling a computer device (which may be a personal computer, a server, or a network communication device such as a router, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only an exemplary embodiment of the present application, and is not intended to limit the scope of the present application.
Claims (10)
1. A particulate matter filtering efficiency control method, characterized by comprising:
determining the time for calculating heat according to the temperature of the particulate matter trap and the mass flow of the exhaust gas;
performing heat calculation according to the temperature of the particulate matter trap and the mass flow of the exhaust gas at the moment to obtain a first result;
if the first result meets a first condition or a second condition, controlling the particulate matter trap to increase the original discharge capacity of unburned soot; the first condition is that the first result exceeds a first threshold; the second condition is that a rate of change of the first result exceeds a second threshold.
2. The method of claim 1, wherein determining the timing for the thermal calculation based on the particulate trap temperature and the exhaust mass flow rate comprises:
determining the moment when the upstream temperature of the particulate matter trap is larger than a third threshold value or the moment when the exhaust gas mass flow is larger than a fourth threshold value and the upstream temperature of the particulate matter trap is larger than a fifth threshold value as the moment when the heat quantity is calculated; the fifth threshold is less than the third threshold, and the fifth threshold is a minimum temperature at which passive regeneration of the particulate trap occurs.
3. The method of claim 1, wherein the calculating the heat based on the particulate trap temperature and the exhaust gas mass flow to obtain a first result comprises:
and performing double integration on the temperature of the particulate matter catcher and the mass flow of the exhaust gas to obtain the first result.
4. The method of claim 1, wherein after determining the timing for the thermal calculation based on the particulate trap temperature and the exhaust mass flow, further comprising:
when the heat calculation is started, enabling a first timer and a second timer respectively, and when the first result does not meet a first condition or a second condition, keeping the current accumulated time by the first timer;
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 a first condition, clearing the heat calculation data and carrying out heat calculation again.
5. The method of any 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 filtering efficiency control apparatus, characterized in that the apparatus comprises: the timing determination module, the calculation module and the control module are arranged;
the opportunity determination module is used for determining the opportunity for 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 carrying out heat calculation according to the temperature of the particulate matter catcher and the mass flow of the exhaust 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 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 a rate of change of the first result exceeds a second threshold.
7. The apparatus according to claim 6, wherein the timing module is specifically configured to:
determining the moment when the upstream temperature of the particulate matter catcher is larger than a third threshold value or the moment when the exhaust gas mass flow is larger than a fourth threshold value and the upstream temperature of the particulate matter catcher is larger than a fifth threshold value as the moment when the heat quantity calculation is carried out; the fifth threshold is less than the third threshold, and the fifth threshold is a minimum temperature at which passive regeneration of the particulate trap occurs.
8. The apparatus of claim 6, wherein the computing module is specifically configured to:
and performing double integration on the temperature of the particulate matter catcher and the mass flow of the exhaust gas to obtain the first result.
9. The apparatus according to claim 6, further comprising a timing module, the timing module being specifically configured to:
when the heat calculation is started, enabling a first timer and a second timer respectively, and when the first result does not meet a first condition or a second condition, keeping the current accumulated time by the first timer;
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 a first condition, clearing the heat calculation data and carrying out heat calculation again.
10. The apparatus according to any one of claims 6 to 9, further comprising an execution module, specifically configured to:
the timing determination module, the calculation module and the control module are triggered to work after the particulate matter trap is replaced or cleaned, or the timing determination module, the calculation module and the control module are triggered to work when ash content in the particulate matter trap is smaller than a seventh threshold value.
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