CN108278146A - Diesel particulate filter control system - Google Patents
Diesel particulate filter control system Download PDFInfo
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- CN108278146A CN108278146A CN201810081972.6A CN201810081972A CN108278146A CN 108278146 A CN108278146 A CN 108278146A CN 201810081972 A CN201810081972 A CN 201810081972A CN 108278146 A CN108278146 A CN 108278146A
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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
-
- 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
- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
-
- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
-
- 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
- F01N2900/1611—Particle filter ash 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
Abstract
The present invention provides a kind of diesel particulate filter control system, including particulate flow module, oxygen flow module, nitrogen dioxide flow module, initiative regeneration module, passive regeneration module, trapping velocity module and accumulation of particulates module；Particulate flow module is used to calculate the particulate flow into particulate filter；Oxygen flow module is used to calculate the oxygen flow into particulate filter；Nitrogen dioxide flow module is used to calculate the nitrogen dioxide flow into particulate filter；Initiative regeneration module is for calculating particulate filter initiative regeneration reaction rate；Passive regeneration module is for calculating particulate filter passive regeneration reaction rate；Trapping velocity module determines the accumulation of particulates rate in particulate filter according to particulate flow and regenerative response rate；Accumulation of particulates module integrates the accumulation of particulates amount determined in particulate filter according to accumulation of particulates rate.The present invention can accurately calculate particle loaded in diesel particulate filter in the case where not depending on pressure or differential pressure pickup.
Description
Technical field
The present invention relates to field of internal combustion engine, especially diesel energy conservation and emissions reduction system.
Background technology
Scheme 1：Chinese patent CN1304743C provides a kind of Waste gas cleaning element of engine, its control method includes
A kind of method of estimation particulate filter carbon carrying capacity.Technological means that the patent is taken and the effect reached are：Engine control
Unit processed estimates Particulate Filter Particulate cumulant according to the difference of particulate filter upstream pressure and downstream pressure, and suggests making
With by engine speed and load by look into chart acquisition the whole estimation of waste gas stream velocity modulation accumulation of particulates amount.The patent is insufficient and
The reason is that when using only pressure difference as the method for estimation accumulation of particulates amount, do not take into account what Particles Distribution estimated pressure difference
It influences.After particulate filter incomplete regen-eration, Particle Distribution state is non-uniform Distribution state, and pressure difference --- cumulant corresponds to
Relationship with it is no longer identical when being uniformly distributed, if not considering to be modified distribution, it will generate accumulation of particulates amount estimation
Error, and then the regeneration opportunity for being computed correctly particulate filter is influenced, and have thermal runaway when causing particulate filter regeneration
Risk.
Scheme 2：Chinese patent CN1297733C provides a kind of engine exhaust emission control device, its control method includes
A kind of method of estimation particulate filter carbon carrying capacity.Technological means that the patent is taken and the effect reached are：Use two
Sensor detects pressure sensor detection of particles filter upstream and downstream pressure difference, and looks into MAP according to engine speed and obtain first
Infer cumulant；Using engine speed and distributive value, by look into MAP obtain indicate a preceding forced regeneration after accumulate
Second infers cumulant.It is to trigger the base of forced regeneration that when the cumulant that the two are inferred, wherein any one, which exceeds corresponding threshold value,
This condition, system determine whether to start forced regeneration further according to conditions such as oxidation catalyzer temperature.The patent is insufficient and the reason is that,
When calculating the first deduction cumulant, influence of the Particle Distribution to pressure difference is not considered；When calculating the second deduction cumulant, only make
It has used engine speed and distributive value as the condition of calculating Particulate Emission, but has not taken into account in combustion engine real work, EGR rate
（ER EGR Rate）Influence with cooling water of internal combustion engine temperature to its Particulate Emission.
Scheme 3：Chinese patent CN 100538033C provide control method and the waste gas purification system of a kind of waste gas cleaning system
System.Technological means that the patent is taken and the effect reached are：It is determined to particle mistake by two factors of pressure difference and mileage travelled
The regeneration of filter is compared by accumulation of particulates amount and mileage travelled with preset decision content, to judge to continuously again
Raw type particulate filter carries out forced regeneration opportunity.This method considers Lubricating oil dilution caused by particulate filter regeneration.
Whether the accumulation of particulates amount and mileage travelled obtained according to pressure difference triggers manually or automatically particle mistake under comprehensive descision conditions present
Filter regeneration, and remind driver that maintenance center is gone to overhaul excessively there is still a need for regenerated in oil dilution.This is specially
It is sharp insufficient and the reason is that：In being calculated as the accumulation of particulates amount of parameter using pressure difference, do not consider Particle Distribution state to passing through pressure difference
The influence for calculating accumulation of particulates amount may cause particle actual accumulation amount to be higher than estimator, and particulate filter regeneration heat is caused to be lost
Control.
Mainly there is also own shortcomings in the prior art：
1. after particulate filter incomplete regen-eration, Particle Distribution state is non-uniform Distribution state, and pressure difference-cumulant corresponds to
Relationship with it is no longer identical when being uniformly distributed, if not considering to be modified distribution, it will generate accumulation of particulates amount estimation
Error, and then the regeneration opportunity for being computed correctly particulate filter is influenced, and have thermal runaway when causing particulate filter regeneration
Risk；
2. when using engine speed and distributive value as the condition for calculating Particulate Emission, combustion engine real work is not taken into account
In, influence of the cooling water of internal combustion engine temperature to its Particulate Emission.；
3. not accounting for when differential pressure pickup failure, the second method of accumulation of particulates amount or repairing for second method are calculated
Positive quantity is less, and precision is limited, and accurate reproduction opportunity can not be provided for particulate filter.
Invention content
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of controls of diesel particulate filter
System can accurately calculate particle loaded in diesel particulate filter in the case where not depending on pressure or differential pressure pickup.
The technical solution adopted by the present invention is：
A kind of diesel particulate filter control system, including particulate flow module, oxygen flow module, nitrogen dioxide flow mould
Block, initiative regeneration module, passive regeneration module, trapping velocity module and accumulation of particulates module；
Particulate flow module is used to calculate the particulate flow into particulate filter；
Oxygen flow module enters the oxygen flow of particulate filter for oxidation catalyzer outlet oxygen flow to be calculated；
Nitrogen dioxide flow module is used to calculate the nitrogen dioxide flow of oxidation catalyzer outlet, that is, enters the two of particulate filter
Nitrogen oxide flow；
Particle and reacting for oxygen are fast in particulate filter during initiative regeneration module is used to calculate particulate filter initiative regeneration
Rate, i.e. particulate filter initiative regeneration reaction rate；
Passive regeneration module be used to calculate particulate filter passive regeneration during in particulate filter particle and nitrogen dioxide it is anti-
Answer rate, i.e. particulate filter passive regeneration reaction rate；
Trapping velocity module determines the accumulation of particulates rate in particulate filter according to particulate flow and regenerative response rate；
Accumulation of particulates module integrates the accumulation of particulates amount determined in particulate filter according to accumulation of particulates rate.
The control system can accurately calculate diesel particulate filter in the case where not depending on pressure or differential pressure pickup
It is interior particle loaded.
Particulate flow module is used for calculating the particulate flow into particulate filter；Particulate flow is substantially micro- by steady state condition
Grain flow and transient condition correction amount codetermine；It is sprayed according to internal-combustion engine rotational speed, fuel oil by a fundamental particle computing module
The corresponding MAP tables of engine conditions inquiry for penetrating quantitative change scale sign determine steady state condition fundamental particle flow；Consider internal combustion engine simultaneously
The amendment to steady state condition fundamental particle flow such as coolant water temperature；By a water temperature correcting module according to cooling water of internal combustion engine temperature
It inquires corresponding MAP tables and obtains water temperature correction factor, sprayed according to internal-combustion engine rotational speed, fuel oil by a transient condition correcting module
Transient detecting deviation is calculated in amount, air-intake of combustion engine amount, and inquiring corresponding MAP tables with the value obtains transient condition amendment system
Number；The steady state condition fundamental particle flow that fundamental particle computing module is calculated particulate flow corrected Calculation module pass through by
The transient condition correction factor that the water temperature correction factor and transient condition correcting module that water temperature correcting module calculates calculate is repaiied
After just, the particulate flow into particulate filter is obtained；
Oxidation catalyzer exports oxygen flow module, for calculating the oxidized catalyst converter of oxygen in exhaust manifold outlet discharge exhaust gas
Enter the oxygen flow of particulate filter after reaction；It includes that exhaust manifold outlet oxygen content coefficients calculation block and DOC go out
Mouth oxygen flow calculates module；Exhaust manifold for internal combustion engine exit oxygen flow is by internal combustion engine transient air-fuel ratio, exhaust gas recycling
The combustion in IC engine such as rate control parameter inquires what corresponding MAP tables obtained by exhaust manifold outlet oxygen content coefficients calculation block
Oxygen content coefficient or oxygen content coefficient in exhaust gas is calculated according to combustion model in exhaust gas；In DOC outlet oxygen flow
In computing module, row that exhaust manifold outlet exhaust air mass flow and exhaust manifold outlet oxygen content coefficients calculation block obtain
Oxygen content multiplication obtains the oxygen flow into oxidation catalyzer at gas manifold outlet；Into the oxygen of oxidation catalyzer
The oxygen that flow is inquired corresponding MAP to oxidation catalyzer bed temperature or is calculated according to oxidation catalyzer Chemical Reaction Model
Reaction rate of the gas in oxidation catalyzer；Reaction rate of the oxygen in catalyst converter looks into corresponding MAP to rear distributive value and obtains oxygen
Change the amount of oxygen of reaction consumption in the unit interval in catalyst converter；Oxygen flow into oxidation catalyzer subtracts oxidation catalyzer list
The amount of oxygen of reaction consumption in the time of position obtains oxidation catalyzer outlet oxygen flow, that is, enters the oxygen stream of particulate filter
Amount.
Nitrogen dioxide flow module is according to nitrogen oxidation in nitrogen oxides flow at exhaust manifold for internal combustion engine and oxidation catalyzer
Object is multiplied to obtain the nitrogen dioxide flow into particulate filter to the conversion ratio of nitrogen dioxide；Nitrogen oxygen at exhaust manifold for internal combustion engine
The engine conditions that compound bare flow is characterized by variables such as internal-combustion engine rotational speed and fuel injection amounts are inquired corresponding MAP tables and are determined,
Consider the amendment of ER EGR Rate and cooling water of internal combustion engine temperature to nitrogen oxides bare flow simultaneously, obtains I. C. engine exhaust discrimination
Nitrogen oxides flow at pipe；The basic conversion ratio that nitrogen oxides is converted to nitrogen dioxide in oxidation catalyzer is by oxidation catalyzer temperature
Nitrogen oxides flow inquires corresponding MAP tables at degree and exhaust manifold or Chemical Reaction Model determines, via oxidation catalyzer aging
After degree coefficient is modified, nitrogen oxides is obtained in oxidation catalyzer to the conversion ratio of nitrogen dioxide；Internal combustion engine is discharged
Know flow（Nitrogen oxides flow at exhaust manifold）Nitrogen oxides enter oxidation catalyzer, it is available according to determining conversion ratio
The nitrogen dioxide flow of oxidation catalyzer outlet, that is, enter the nitrogen dioxide flow of particulate filter；
Oxidation catalyzer degree of aging coefficient is passed through by accumulated time of the oxidation catalyzer bed temperature beyond aging temperature threshold value
Inquire what corresponding MAP tables determined.
Initiative regeneration module is repaiied by the fundamental reaction efficiency and active reaction efficiency of oxygen in particulate filter and particle
Positive coefficient is multiplied during calculating particulate filter initiative regeneration the active reaction efficiency of particle and oxygen in particulate filter；Particle
The fundamental reaction efficiency of oxygen and particle exports oxygen flow by particulate filter bed temperature and oxidation catalyzer in filter
The reaction condition in particulate filter characterized is obtained through looking into corresponding MAP or reaction model；Active reaction Efficiency correction coefficient
The particle deposition characteristic reflected by accumulation of particulates amount looks into the acquisition of response curve property list；It is tired by the particle in particulate filter
Accumulated amount and active reaction efficiency are multiplied particulate filter initiative regeneration can be obtained during in particulate filter particle and oxygen it is anti-
Answer rate.
Passive regeneration module passes through dependent response efficiency phase in accumulation of particulates amount in particulate filter and particulate filter
Multiply the reaction rate of particle and nitrogen dioxide in filter during calculating particulate filter passive regeneration；It is passive in particulate filter
Reaction efficiency by oxidation catalyzer outlet exhaust temperature, into micro- in the nitrogen dioxide flow and particulate filter of particulate filter
The ratio between grain cumulant is obtained by looking into corresponding MAP tables or dependent response model；By dependent response efficiency in particulate filter and
Particulate filter passive regeneration reaction rate can be obtained in accumulation of particulates amount multiplication in particulate filter.
Trapping velocity module includes arresting efficiency computing module and trapping rate calculation module；In arresting efficiency computing module
It is interior, the filtering feature characterized by accumulation of particulates amount in particulate filter and particulate filter total measurement (volume) through look into corresponding MAP tables or
Arresting efficiency model obtains particulate filter traps efficiency；Rate calculation module is trapped according to the particle stream for entering particulate filter
Amount is multiplied to obtain particulate filter traps rate with the particulate filter traps efficiency that arresting efficiency computing module calculates, i.e., singly
The particle mass trapped in the time of position；Particulate filter traps rate subtracts particulate filter initiative regeneration reaction rate and micro-
Grain filter passive regeneration reaction rate obtains the accumulation of particulates rate in particulate filter；
Accumulation of particulates module includes particle integration module；The particle that particle integration module is used to calculate in current particulate filter is tired
Accumulated amount；When internal combustion engine is in running order, particle integration module begins to use accumulation of particulates integral initial value and particle at this time
Cumulative speed carries out particle mass integral, calculates the accumulation of particulates amount accumulated in particulate filter；When controller sends out particle mistake
When filter replacement or clean signal, integrated value is reset, the initial value after resetting is that filter resets primary quantity；In internal combustion
When machine is shut down, controller will preserve the accumulation of particulates amount that particle integration module calculates, and as next internal combustion engine when is used
Initial value is integrated in the accumulation of particulates of calculating.
The advantage of the invention is that：
1. can avoid calculating accumulation of particulates amount using pressure difference, due to particulate filter because incomplete regen-eration causes Particle Distribution not
Error is caused to calculating accumulation of particulates amount by pressure difference, causes particulate filter initiative regeneration that the danger of thermal runaway occurs, carries
High security of system.
2. can avoid calculating accumulation of particulates amount using pressure difference, since to cause can not to calculate particle tired for pressure sensor failure
The danger of accumulated amount improves security of system；
3. calculating process does not depend on differential pressure pickup, emission control systems can need not install pressure sensor, reduce cost；Using
When using the emission control systems of pressure sensor, the particle calculated by pressure difference can be corrected by Computational Methods through the invention
Cumulant improves the reliability and precision of system；
4. when calculating particle, nitrogen oxides and oxygen discharge, relative influence condition is fully considered, can accurately calculate each discharge
The discharge capacity of object.
Description of the drawings
Fig. 1 is the engine exhaust gas processing structure schematic diagram of the present invention.
Fig. 2 is the structure composition schematic diagram of the present invention.
Fig. 3 is the particulate flow module diagram of the present invention.
Fig. 4 is the oxygen flow module diagram of the present invention.
Fig. 5 is the nitrogen dioxide flow module diagram of the present invention.
Fig. 6 is that the initiative regeneration module of the present invention calculates schematic diagram.
Fig. 7 is that the passive regeneration module of the present invention calculates schematic diagram.
Fig. 8 is that the trapping velocity module of the present invention calculates schematic diagram.
Fig. 9 is that the accumulation of particulates module of the present invention calculates schematic diagram.
Specific implementation mode
With reference to specific drawings and examples, the invention will be further described.
In Fig. 1, the exhaust gas of internal combustion engine first passes through oxidation catalyzer by exhaust manifold（Abbreviation DOC）, using particle mistake
Filter（Also referred to as particle trapper, abbreviation DPF）Processing, to meet the waste gas emission standard of country.
Fig. 2 is diesel particulate filter control system architecture schematic diagram.Diesel particulate filter of the present invention
Control system includes particulate flow module, oxygen flow module, nitrogen dioxide flow module, initiative regeneration module, passive regeneration mould
Block, trapping velocity module and accumulation of particulates module.
Particulate flow module is used to calculate the unprocessed preceding Particulate Emission flow of engine exhaust gas；
Oxygen flow module calculates the unprocessed preceding oxygen flow of engine exhaust gas and after oxidation catalyzer reacts in exhaust gas
Oxygen flow；
Nitrogen dioxide flow module calculates the unprocessed preceding discharged nitrous oxides flow of engine exhaust gas and passes through oxidation catalysis
Nitrogen dioxide flow in exhaust gas after device reaction, that is, the nitrogen dioxide flow into particulate filter；
Particle and reacting for oxygen are fast in particulate filter during initiative regeneration module is used to calculate particulate filter initiative regeneration
Rate, i.e. particulate filter initiative regeneration reaction rate；
Passive regeneration module be used to calculate particulate filter passive regeneration during in particulate filter particle and nitrogen dioxide it is anti-
Answer rate, i.e. particulate filter passive regeneration reaction rate；
Trapping velocity module determines the accumulation of particulates rate in particulate filter according to particulate flow and regenerative response rate；
Accumulation of particulates module integrates the accumulation of particulates amount determined in particulate filter according to accumulation of particulates rate.
Fig. 3 is particulate flow module diagram；Particulate flow module is used for calculating the particulate flow into particulate filter
109；Particulate flow is codetermined by steady state condition fundamental particle flow and transient condition correction amount；Turn according to by such as internal combustion engine
The engine conditions of the variables such as speed 102, fuel injection amount 103 characterization inquire corresponding MAP tables via fundamental particle computing module 105
It determines steady state condition fundamental particle flow, while needing to consider cooling water of internal combustion engine temperature 101 and air-intake of combustion engine amount 104 etc. to steady
The amendment of state operating mode fundamental particle flow；Fundamental particle computing module 106 is calculated particulate flow corrected Calculation module 108
Steady state condition fundamental particle flow pass through the water temperature correction factor calculated by water temperature correcting module 105 and transient condition corrects mould
After the transient condition correction factor that block 107 calculates is modified, the particulate flow 109 into particulate filter is obtained；Wherein, water
Warm correcting module 105 inquires corresponding MAP tables according to cooling water of internal combustion engine temperature 101 and obtains water temperature correction factor, transient condition amendment
Transient detecting deviation is calculated according to internal-combustion engine rotational speed 102, fuel injection amount 103, air-intake of combustion engine amount 104 in module 107,
Corresponding MAP tables, which are inquired, with the value obtains transient condition correction factor；
Fig. 4 is oxidation catalyzer outlet oxygen flow module, oxidized for calculating the oxygen in exhaust manifold outlet discharge exhaust gas
Enter the oxygen flow 208 of particulate filter after catalyst converter reaction；It includes that exhaust manifold outlet oxygen content coefficient calculates mould
Block 206 and DOC outlet oxygen flow calculate module 207；Exhaust manifold for internal combustion engine exit oxygen flow is by internal combustion engine transient sky
Ratio 201 is fired, ER EGR Rate 203 waits combustion in IC engine control parameter to pass through exhaust manifold outlet oxygen content coefficient and calculates mould
Block 206, which inquires in the exhaust gas that corresponding MAP tables obtain oxygen content coefficient or oxygen in exhaust gas is calculated according to combustion model, to be contained
Coefficient of discharge；In DOC outlet oxygen flow calculates module 207, exhaust manifold outlet exhaust air mass flow 202 goes out with exhaust manifold
Oxygen content multiplication obtains entering oxidation catalysis at the exhaust manifold outlet that mouth oxygen content coefficients calculation block 206 obtains
The oxygen flow of device；Oxygen flow into oxidation catalyzer inquires corresponding MAP or root to oxidation catalyzer bed temperature 204
Reaction rate of the oxygen being calculated according to oxidation catalyzer Chemical Reaction Model in oxidation catalyzer；Oxygen is in catalyst converter
Reaction rate and rear distributive value 205 look into corresponding MAP and obtain the amount of oxygen of reaction consumption in the unit interval in oxidation catalyzer；Into
The oxygen flow for entering oxidation catalyzer subtracts the amount of oxygen of reaction consumption in the oxidation catalyzer unit interval, obtains oxidation catalyzer
Oxygen flow 208 is exported, that is, enters the oxygen flow of particulate filter.
Fig. 5 is particulate filter entrance nitrogen dioxide flow module diagram.Particulate filter entrance nitrogen dioxide flow
Module is used to calculate the nitrogen dioxide flow 311 into particulate filter；Do not have between exhaust manifold for internal combustion engine and oxidation catalyzer
To the equipment that exhaust gas is handled, so exhaust manifold for internal combustion engine exit nitrogen oxides flow may be considered oxidation catalyzer
Inlet nitrogen oxides flow.In oxidation catalyzer inlet nitrogen oxides computing module 309, oxidation catalyzer entrance nitrogen oxidation
Object bare flow is inquired corresponding by the engine conditions that the variables such as internal-combustion engine rotational speed 102 and fuel of internal combustion engine emitted dose 103 characterize
MAP tables determine, while considering the amendment of 101 pairs of nitrogen oxides bare flows of ER EGR Rate 203 and cooling water of internal combustion engine temperature,
Obtain oxidation catalyzer inlet nitrogen oxides flow（Nitrogen oxides flow i.e. at exhaust manifold for internal combustion engine）.In oxidation catalyzer
In the conversion ratio computing module 308 that nitrogen oxides is converted to nitrogen dioxide, nitrogen oxides turns to nitrogen dioxide in oxidation catalyzer
The basic conversion ratio changed is by oxidation catalyzer temperature 301 and oxidation catalyzer inlet exhaust gases flow 202 by looking into corresponding MAP files
Or Chemical Reaction Model determines, and look into corresponding MAP beyond aging temperature threshold value duration by oxidation catalyzer bed temperature 204 and obtain
Catalyst converter degree of aging coefficient be modified after, obtain in oxidation catalyzer nitrogen oxides to the conversion ratio of nitrogen dioxide.
Oxidation catalyzer exports in NO2 flow rate calculations module 310, the oxidation catalyzer inlet nitrogen oxides stream that computing module 309 determines
Amount, according to computing module 308 determine conversion ratio can be obtained oxidation catalyzer outlet nitrogen dioxide flow 311, that is, into
Enter the nitrogen dioxide flow 311 of particulate filter.
Fig. 6 is that initiative regeneration module calculates schematic diagram.Initiative regeneration module 404 is for calculating the interior active of particulate filter again
When raw in filter particle and oxygen reaction rate 405, it indicates the particle mass of passive regeneration consumption in unit interval.
In initiative regeneration module 404, the fundamental reaction efficiency of oxygen and particle is by particulate filter bed temperature 401 in particulate filter
The reaction condition in particulate filter characterized with oxidation catalyzer outlet oxygen flow 208 is through looking into corresponding MAP or reaction mould
Type obtains；The particle deposition characteristic that active reaction Efficiency correction coefficient is reflected by accumulation of particulates amount 808 looks into response curve characteristic
Table obtains.By the fundamental reaction efficiency and active of oxygen and particle are anti-in particulate filter during initiative regeneration in particulate filter
Answer the active reaction of particle and oxygen in particulate filter during Efficiency correction multiplication calculating particulate filter initiative regeneration
Efficiency；It is multiplied with active reaction efficiency finally by the accumulation of particulates amount in particulate filter and particulate filter can be obtained actively again
Raw reaction rate 405.
Fig. 7 is that passive regeneration module calculates schematic diagram.Passive regeneration module 504 is used to calculate in particulate filter passively again
When raw in filter particle and nitrogen dioxide reaction rate 505, it indicates the leptomere of passive regeneration consumption in unit interval
Amount.In passive regeneration module 504, dependent response efficiency is by 501 He of oxidation catalyzer outlet exhaust temperature in particulate filter
Oxidation catalyzer exports the particle mistake that nitrogen dioxide flow 311 is characterized with the ratio between the particle cumulative amount 808 in particulate filter
Dependent response condition in filter is obtained through looking into corresponding MAP or reaction model.By dependent response efficiency in particulate filter and
Particulate filter passive regeneration reaction rate 505 can be obtained in the multiplication of accumulation of particulates amount 808 in particulate filter.
Fig. 8 is that trapping velocity module calculates schematic diagram；It includes arresting efficiency computing module 706 and trapping rate calculations mould
Block 607；Arresting efficiency computing module 706 is trapped in carrier for calculating in the exhaust gas for flowing through particulate filter by particulate filter
Interior particle accounts for the percentage of total particle in exhaust gas；In arresting efficiency computing module 706, by accumulation of particulates in particulate filter
The filtering feature that amount 808 and particulate filter total measurement (volume) 705 are characterized obtains particle through looking into corresponding MAP tables or arresting efficiency model
Filter traps efficiency；Rate calculation module 607 is trapped according to the particulate flow 109 and arresting efficiency for entering particulate filter
The particulate filter traps efficiency that computing module 706 calculates is multiplied to obtain particulate filter traps rate, i.e., is caught in the unit interval
The particle mass collected；Particulate filter traps rate subtracts particulate filter initiative regeneration reaction rate 405 and micro particle filtering
Device passive regeneration reaction rate 505 obtains the accumulation of particulates rate 608 in particulate filter.
Fig. 9 is that accumulation of particulates module calculates schematic diagram；It includes particle integration module 807；Particle integration module 807 is used for
Calculate the accumulation of particulates amount 808 in current particulate filter；When engine shutdown state 801 is not 0, i.e. internal combustion engine is in work
When state, particle integration module 807 begins to use accumulation of particulates integral initial value 804 and accumulation of particulates rate 608 to carry out at this time
Particle mass integrates, and calculates the accumulation of particulates amount 808 accumulated in particulate filter；When controller send out particulate filter replace or
When clean signal 802（For example remove service station replacement or clean particulate filter）, integrated value is reset, it is initial after resetting
Value is that filter resets primary quantity 805；In engine shutdown, controller will preserve the particle that calculates of particle integration module 807
Cumulant 808, and initial value is integrated for the accumulation of particulates of calculating when as next internal combustion engine.
The present invention can independently calculate accumulation of particulates amount, or as with differential pressure pickup independent of differential pressure pickup
The spare accumulation of particulates amount of particular filtration system calculates.
Claims (9)
1. a kind of diesel particulate filter control system, including particulate flow module, oxygen flow module, nitrogen dioxide flow mould
Block, initiative regeneration module, passive regeneration module, trapping velocity module and accumulation of particulates module；
Particulate flow module is used to calculate the particulate flow into particulate filter；
Oxygen flow module enters the oxygen flow of particulate filter for oxidation catalyzer outlet oxygen flow to be calculated；
Nitrogen dioxide flow module is used to calculate the nitrogen dioxide flow of oxidation catalyzer outlet, that is, enters the two of particulate filter
Nitrogen oxide flow；
Particle and reacting for oxygen are fast in particulate filter during initiative regeneration module is used to calculate particulate filter initiative regeneration
Rate, i.e. particulate filter initiative regeneration reaction rate；
Passive regeneration module be used to calculate particulate filter passive regeneration during in particulate filter particle and nitrogen dioxide it is anti-
Answer rate, i.e. particulate filter passive regeneration reaction rate；
Trapping velocity module determines the accumulation of particulates rate in particulate filter according to particulate flow and regenerative response rate；
Accumulation of particulates module integrates the accumulation of particulates amount determined in particulate filter according to accumulation of particulates rate.
2. diesel particulate filter control system as described in claim 1, which is characterized in that
Particulate flow module is used for calculating the particulate flow into particulate filter；Particulate flow is by steady state condition fundamental particle stream
Amount and transient condition correction amount codetermine；By a fundamental particle computing module according to internal-combustion engine rotational speed, fuel injection amount
The engine conditions of variable characterization inquire corresponding MAP tables and determine steady state condition fundamental particle flow；Mould is corrected by a water temperature
Root tuber inquires corresponding MAP tables according to cooling water of internal combustion engine temperature and obtains water temperature correction factor, passes through a transient condition correcting module root
Transient detecting deviation is calculated according to internal-combustion engine rotational speed, fuel injection amount, air-intake of combustion engine amount, is inquired with the value corresponding
MAP tables obtain transient condition correction factor；Particulate flow corrected Calculation module fundamental particle computing module is calculated steady
State operating mode fundamental particle flow passes through the water temperature correction factor calculated by water temperature correcting module and transient condition correcting module calculates
Transient condition correction factor be modified after, obtain the particulate flow into particulate filter.
3. diesel particulate filter control system as described in claim 1, which is characterized in that
Oxygen flow module, for entering particle after calculating the oxidized catalyst converter reaction of oxygen in exhaust manifold outlet discharge exhaust gas
The oxygen flow of filter；It includes that exhaust manifold outlet oxygen content coefficients calculation block and DOC outlet oxygen flow calculate
Module；Exhaust manifold for internal combustion engine exit oxygen flow is by internal combustion engine transient air-fuel ratio, the combustion in IC engine such as ER EGR Rate
Control parameter inquires oxygen content in the exhaust gas that corresponding MAP tables obtain by exhaust manifold outlet oxygen content coefficients calculation block
Oxygen content coefficient in exhaust gas is calculated according to combustion model in coefficient；In DOC outlet oxygen flow calculates module, exhaust
Oxygen at the exhaust manifold outlet that manifold outlet exhaust air mass flow is obtained with exhaust manifold outlet oxygen content coefficients calculation block
Gas content multiplication obtains the oxygen flow into oxidation catalyzer；Into the oxygen flow and oxidation catalysis of oxidation catalyzer
Device bed temperature inquires corresponding MAP or the oxygen being calculated according to oxidation catalyzer Chemical Reaction Model in oxidation catalyzer
Interior reaction rate；Reaction rate of the oxygen in catalyst converter looks into corresponding MAP to rear distributive value and obtains unit in oxidation catalyzer
The amount of oxygen of reaction consumption in time；Oxygen flow into oxidation catalyzer subtracts in the oxidation catalyzer unit interval reaction and disappears
The amount of oxygen of consumption obtains oxidation catalyzer outlet oxygen flow, that is, enters the oxygen flow of particulate filter.
4. diesel particulate filter control system as described in claim 1, which is characterized in that
Nitrogen dioxide flow module according to nitrogen oxides in nitrogen oxides flow at exhaust manifold for internal combustion engine and oxidation catalyzer to
The conversion ratio of nitrogen dioxide is multiplied to obtain the nitrogen dioxide flow into particulate filter；Nitrogen oxides at exhaust manifold for internal combustion engine
Bare flow is inquired corresponding MAP tables by the engine conditions of internal-combustion engine rotational speed and fuel injection amount these variables characterization and is determined, together
When consider the amendment to nitrogen oxides bare flow of ER EGR Rate and cooling water of internal combustion engine temperature, obtain exhaust manifold for internal combustion engine
Locate nitrogen oxides flow；The basic conversion ratio that nitrogen oxides is converted to nitrogen dioxide in oxidation catalyzer is by oxidation catalyzer temperature
Corresponding MAP tables are inquired with nitrogen oxides flow at exhaust manifold to determine, are modified via oxidation catalyzer degree of aging coefficient
Afterwards, nitrogen oxides is obtained in oxidation catalyzer to the conversion ratio of nitrogen dioxide；Internal combustion engine discharge it has been found that at exhaust manifold
The nitrogen oxides of nitrogen oxides flow enters oxidation catalyzer, can be obtained the two of oxidation catalyzer outlet according to determining conversion ratio
Nitrogen oxide flow enters the nitrogen dioxide flow of particulate filter.
5. diesel particulate filter control system as claimed in claim 4, which is characterized in that
Oxidation catalyzer degree of aging coefficient is passed through by accumulated time of the oxidation catalyzer bed temperature beyond aging temperature threshold value
Corresponding MAP tables are inquired to determine.
6. diesel particulate filter control system as described in claim 1, which is characterized in that
The fundamental reaction efficiency and active reaction Efficiency correction system that initiative regeneration module passes through oxygen in particulate filter and particle
Count the active reaction efficiency of particle and oxygen in particulate filter during being multiplied calculating particulate filter initiative regeneration；Micro particle filtering
The fundamental reaction efficiency of oxygen and particle is by particulate filter bed temperature and oxidation catalyzer outlet oxygen flow institute table in device
Reaction condition in the particulate filter of sign is obtained through looking into corresponding MAP or reaction model；Active reaction Efficiency correction coefficient is by micro-
The particle deposition characteristic that grain cumulant is reflected looks into the acquisition of response curve property list；Pass through the accumulation of particulates amount in particulate filter
It is multiplied to obtain the reaction rate of particle and oxygen in particulate filter during particulate filter initiative regeneration with active reaction efficiency,
That is particulate filter initiative regeneration reaction rate.
7. diesel particulate filter control system as described in claim 1, which is characterized in that
Passive regeneration module is multiplied meter by the accumulation of particulates amount in particulate filter with dependent response efficiency in particulate filter
Calculate the reaction rate of particle and nitrogen dioxide in filter during particulate filter passive regeneration；Dependent response in particulate filter
Efficiency is tired out by oxidation catalyzer outlet exhaust temperature, into particle in the nitrogen dioxide flow and particulate filter of particulate filter
The ratio between accumulated amount is obtained by looking into corresponding MAP tables or dependent response model；Pass through dependent response efficiency and particle in particulate filter
Particulate filter passive regeneration reaction rate can be obtained in accumulation of particulates amount multiplication in filter.
8. diesel particulate filter control system as described in claim 1, which is characterized in that
Trapping velocity module includes arresting efficiency computing module and trapping rate calculation module；In arresting efficiency computing module,
The filtering feature characterized by accumulation of particulates amount in particulate filter and particulate filter total measurement (volume) is through looking into corresponding MAP tables or trapping
Efficiency Model obtains particulate filter traps efficiency；Particulate flow of the rate calculation module according to entrance particulate filter is trapped,
When being multiplied to obtain particulate filter traps rate, i.e. unit with the particulate filter traps efficiency that arresting efficiency computing module calculates
The interior particle mass trapped；Particulate filter traps rate subtracts particulate filter initiative regeneration reaction rate and particle mistake
Filter passive regeneration reaction rate obtains the accumulation of particulates rate in particulate filter.
9. diesel particulate filter control system as described in claim 1, which is characterized in that
Accumulation of particulates module includes particle integration module；The particle that particle integration module is used to calculate in current particulate filter is tired
Accumulated amount；When internal combustion engine is in running order, particle integration module begins to use accumulation of particulates integral initial value and particle at this time
Cumulative speed carries out particle mass integral, calculates the accumulation of particulates amount accumulated in particulate filter；When controller sends out particle mistake
When filter replacement or clean signal, integrated value is reset, the initial value after resetting is that filter resets primary quantity；In internal combustion
When machine is shut down, controller will preserve the accumulation of particulates amount that particle integration module calculates, and as next internal combustion engine when is used
Initial value is integrated in the accumulation of particulates of calculating.
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