CN110206623A - A kind of motor exhaust post-processing control system and control method - Google Patents
A kind of motor exhaust post-processing control system and control method Download PDFInfo
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- CN110206623A CN110206623A CN201910541804.5A CN201910541804A CN110206623A CN 110206623 A CN110206623 A CN 110206623A CN 201910541804 A CN201910541804 A CN 201910541804A CN 110206623 A CN110206623 A CN 110206623A
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- 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
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- Y02T10/12—Improving ICE efficiencies
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention provides a kind of motor exhaust post-processing control system and control methods, applied to the processing after tail gas.Control system includes exhaust aftertreatment device, engine electric-controlled unit, diesel injection device, urea injection apparatus, post-processing electronic control unit.Control method of the invention is the duty parameter according to different sensor measured value and engine, based on the data model demarcated in advance, completes the control of DPF initiative regeneration, the cleaning of DPF dust stratification, four Xiang Gongneng of SCR urea injection control and system fault diagnosis.The present invention is made of software systems and hardware system, is used " transient state piecewise linear interpolation algorithm " to MAP data, is greatly enhanced computational accuracy and execution efficiency." pressure difference dynamic integral, timesharing comparison method " is used to DPF differential pressure pickup, differential pressure pickup is solved because of pressure difference is unstable caused by affected by many factors, fluctuation is big situation, enhance the robustness of exhaust gas aftertreatment system control strategy, largely reduce regenerated erroneous judgement, to reduce inappropriate initiative regeneration operation, oil consumption is saved.
Description
Technical field
The invention belongs to diesel engine technologies fields, are applied to exhaust gas aftertreatment system, relate generally to exhaust emissions control
Technology path " DOC+DPF+SCR " processed.
Background technique
To meet the diesel engine/tail gas discharge standard being increasingly stringenter, not only need to diesel engine/vehicle engine skill
Art carries out innovation improvement, while needing using exhaust aftertreatment technology, it is ensured that and the discharge value of pollutant controls in reasonable section,
Cut down pollution of the diesel engine emissions pollutant to environment, meet legal exhaust emission standard, improves ambient air quality.
Environmental Protection Department formulate " the diesel engine pollutant emission control technology of non-rice habitats mechanically moving and its dress is wanted
Ask " (exposure draft) increase the emission request of granule number PN, and emission result should be not more than 5 × 1012#/kWh, simultaneously
There cannot be clearly visible cigarette when dpf regeneration, therefore dress should install wall stream additional with the non-rice habitats mechanically moving of 37kW to 560kW diesel engine
Formula particulate matter trap DPF.The key technology route that 37kW to 75kW is used at present has " EGR+DOC+DPF ".
In this field, the English name in relation to equipment: DOC --- oxidation catalyzer (Diesel Oxidation
Catalyst), DPF --- grain catcher (Diesel Particulate Filter), SCR --- selective catalytic reduction
Device (Selective Catalytic Reduction).
The initiative regeneration of DPF: carbon carrying capacity reaches high value in DPF, and commercial vehicle is generally 4~5g/L, and exhaust resistance increases
To being enough to influence the oil consumption of engine, control unit of engine (ECU or post-processing control unit) by change engine and after
The working condition of processing makes the process of the quick oxidation removal of the soot in DPF be known as initiative regeneration.Initiative regeneration was according to regenerating
The delivery temperature of DPF entrance divides conventional initiative regeneration and low temperature initiative regeneration again in journey.Conventional initiative regeneration DPF inlet temperature is logical
Often reach 600 DEG C or more, low temperature initiative regeneration DPF inlet temperature is normally controlled in 500 DEG C or less.Conventional initiative regeneration process hair
Final vacuum temperature in motivation whirlpool need to be increased to 300 DEG C or more, then pass through the HC spraying system oil spout being mounted on exhaust pipe or height
Spray generates HC after pressing in the cylinder of common rail system, improves delivery temperature after aoxidizing on DOC.Low temperature initiative regeneration can be by using section
Valve and exhaust shutter improve delivery temperature.
SCR system control strategy is according to the state and emission control of engine operating condition parameter and selective catalytic reduction device
The amount of injection of target decision urea solution.The major function of control module is the state of the operating condition and catalyst converter according to engine
Control spraying system sprays suitable urea solution and enters exhaust pipe.Since a large amount of ammonia (NH can be stored under SCR catalyst low temperature3,
These ammonia can release during from low temperature to thermal shock, and any closed loop strategy of this process is all unable to control, and only take
Feedback control cannot reach good effect, and there is also intersect to ammonia for nitrogen oxides (NOx) sensor of commercialization at present
Sensitive issue, that is, in the presence of ammonia, it can be by NH3As NOx, cause measurement result bigger than normal, thus is used as and closes
Ring control remains some problems.Ammoniacal sensor is currently developed, and there are no batch to produce.In the Ou Si stage, European SCR system is all used
Opened loop control obtains good effect, and opened loop control is the basis of closed-loop control, and SCR system closed-loop control cannot be complete
Instead of open loop, even if also having a set of open loop control strategy as spare, to prevent sensor failure using the system of closed-loop control.
Summary of the invention
The object of the present invention is to provide motor exhaust post-processing control systems and control that one kind can solve the above problems
Method.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows:
In a first aspect, the present invention provides a kind of motor exhausts to post-process control system, including exhaust aftertreatment device, hair
Motivation electronic control unit, diesel injection device, urea injection apparatus, post-processing electronic control unit；
The exhaust aftertreatment device is connected on exhaust pipe, in exhaust aftertreatment device, DOC, DPF, mixing chamber, SCR
And silencing means successively encapsulates from front to back；Several sensors are equipped on exhaust aftertreatment device；The diesel injection device
Injector head be satisfied in the exhaust pipe of the front end DOC, by diesel injection into exhaust pipe；The injector head of the urea injection apparatus
It is satisfied in mixing chamber, urea is ejected into the mixing chamber of the front end SCR.
The sensor include: DOC prime temperature sensor, DOC rear class temperature sensor, DPF differential pressure pickup,
SCR prime temperature sensor, NOx sensor, SCR rear class temperature sensor；After the DOC prime temperature sensor and DOC
Grade temperature sensor is separately mounted to the front and back end DOC；There are two sensors for the DPF differential pressure pickup band, are separately mounted to
The pressure difference between DPF inlet, outlet is detected in the front and back end DPF；SCR prime temperature sensor and SCR rear class temperature sensor are installed respectively
In the front and back end SCR；NOx sensor is mounted on silencing means rear end.
It post-processes in electronic control unit, main functional modules have: MCU module, data memory module, A/D module, power supply mould
Block, CAN transmission module, low-power drive module.
Power module is connect with 12V or 24V DC power supply apparatus, drives mould to MCU module confession+5V power supply and to low-power
Block offer+5V power supply；MCU module and CAN transmission module, which are established physics and is bi-directionally connected, to be carried out sending and receiving data；MCU module
Physical connection is established with low-power drive module, controls the driving of low-power drive module；MCU module is built with data memory module
Vertical physics is bi-directionally connected, by SPI protocol error code and system run key parameter be written in data memory module or from
Data are read in data memory module；MCU module and A/D module establish physical connection, and real-time circulation acquires each channel sensor
Signal；Low-power drive module and urea injection apparatus establish physical connection, provide electric energy to the heating tube of urea injection apparatus；
CAN transmission module is established physics and is bi-directionally connected with urea injection apparatus, NOx sensor, diesel injection device, is sent and is connect
Receive data；CAN transmission module is also established physics with engine electric-controlled unit 2 simultaneously and is bi-directionally connected, and carries out sending and receiving data；
A/D module 20 and DOC prime temperature sensor 3, DOC rear class temperature sensor 4, DPF differential pressure pickup 6, SCR prime temperature pass
Sensor 8, SCR rear class temperature sensor 14, environment temperature sensor 16 establish physical connection, acquire the simulation of each sensor in real time
Signal.
Second aspect, the present invention propose a kind of motor exhaust post-processing control method, survey according to different sensors
The duty parameter of value and engine, based on the data model demarcated in advance, the control of completion DPF initiative regeneration, DPF dust stratification are clear
Reason, four Xiang Gongneng of SCR urea injection control and system fault diagnosis；
Four Xiang Gongneng are as follows:
(1), DPF initiative regeneration controls
Based on SCR algorithm policy and SCR control strategy, in conjunction with the measured value and SCR rear class temperature of SCR prime temperature sensor
The mean value temperature for spending the measured value of sensor, using high temperature urea injection strategy or low temperature urea injection strategy；Based on preparatory
Extraction flow, dust stratification amount and the DPF pressure difference correction factor association relation model demarcated predict DPF pressure difference correction factor in real time
And DPF pressure difference is modified, then the association based on the engine exhaust flow, DPF pressure difference and DPF carbon carrying capacity demarcated in advance
Relational model predicts DPF carbon carrying capacity in real time, if the DPF carbon carrying capacity detected meets or exceeds dpf regeneration carbon carrying capacity limit value,
The initiative regeneration of DPF is then carried out using the method for high-temp combustion carbon particle；DOC prime is iterated through during DPF initiative regeneration
The measured value of temperature sensor and the measured value of DOC rear class temperature sensor calculate the front and back temperature difference of DOC, are based on catalysis oxidation
The front and back temperature difference of device DOC and pre- spray diesel oil model calculate and obtain distributive value；
(2), DPF dust stratification is cleared up
After DPF initiative regeneration, aphlogistic ingredient forms ash and is trapped in inside DPF, saves bit by bit a certain amount of, need
Periodic dust stratification is wanted to clear up；
(3), SCR urea injection control
SCR control strategy is divided into two kinds of SCR low temperature control strategy and SCR high-temperature control strategy in MCU module；Work as catalyst converter
SCR mean value temperature uses SCR low temperature control strategy between 200 DEG C to 300 DEG C, adopts when SCR mean value temperature is greater than 300 DEG C
With SCR high-temperature control strategy；
(4), system fault diagnosis
Error code is stored to data if monitoring failure and is stored by the working condition for monitoring above-mentioned each temperature sensor
In module, for read failure code in breakdown maintenance Shi Zaicong data memory module in the future；
The invention has the benefit that controlling processing system and controlling party after a kind of motor exhaust of the present invention
Method is made of software systems and hardware system.Diesel engine for power in 75kW to 560kW uses technology path " DOC
+ DPF+SCR " uses " transient state piecewise linear interpolation algorithm " to MAP data, carries out the control of DPF initiative regeneration, the cleaning of DPF dust stratification
Warning, SCR urea injection control and system fault diagnosis, greatly enhance computational accuracy and execution efficiency.DPF is pressed
Gap sensor uses " pressure difference dynamic integral, timesharing comparison method ", and solve differential pressure pickup causes because affected by many factors
Pressure difference is unstable, the big situation of fluctuation, enhance the robustness of exhaust gas aftertreatment system control strategy, largely subtract
Few regenerated erroneous judgement is effectively controlled the discharge value of pollutant reasonable to reduce inappropriate initiative regeneration operation
Section cuts down pollution of the non-rice habitats mechanically moving diesel engine emissions pollutant to environment, meets legal exhaust emission standard,
Oil consumption is saved, improves ambient air quality, the engine exhaust emission is made to meet the emission limit requirement of regulation.
Detailed description of the invention
Fig. 1 is that motor exhaust of the invention post-processes control system schematic diagram；
Fig. 2 is that motor exhaust of the invention post-processes control principle block diagram.
Marked in the figure: exhaust aftertreatment device 1, engine electric-controlled unit 2, DOC prime temperature sensor 3, DOC rear class temperature
Sensor 4, diesel injection device 5, DPF differential pressure pickup 6, urea injection apparatus 7, SCR prime temperature sensor 8, NOx sensing
Device 9, DOC10, DPF11, mixing chamber 12, SCR13, SCR rear class temperature sensor 14, silencing means 15, environment temperature sensor
16, post-process electronic control unit 17, MCU module 18, data memory module 19, A/D module 20, power module 21, CAN transmission module
22, low-power drive module 23.
Specific embodiment
It is intuitive to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with Fig. 1 in the present invention
And Fig. 2, clear, complete description is carried out to the present invention.
In a first aspect, the present invention proposes a kind of motor exhaust post-processing control system, including exhaust aftertreatment device 1, hair
Motivation electronic control unit 2, diesel injection device 5, urea injection apparatus 7, post-processing electronic control unit 17.
The exhaust aftertreatment device 1 is connected on exhaust pipe.In exhaust aftertreatment device 1, DOC10, DPF11, mixing
Chamber 12, SCR13 and silencing means 15 successively encapsulate from front to back.Several sensors are equipped on exhaust aftertreatment device 1.Described
The injector head of diesel injection device 5 is satisfied in the exhaust pipe of the front end DOC10, by diesel injection into exhaust pipe.The urea
The injector head of injection apparatus 7 is satisfied in mixing chamber 12, and urea is ejected into the mixing chamber 12 of the front end SCR13.
The sensor includes: DOC prime temperature sensor 3, DOC rear class temperature sensor 4, DPF differential pressure pickup
6, SCR prime temperature sensor 8, NOx sensor 9 (NOx sensor), SCR rear class temperature sensor 14.It further include ring
Border temperature sensor 16.Before the DOC prime temperature sensor 3 and DOC rear class temperature sensor 4 is separately mounted to DOC10
Rear end；The DPF differential pressure pickup 6 with there are two sensor, being separately mounted to the front and back end DPF11, detection DPF11 into and out of
Pressure difference between gas；SCR prime temperature sensor 8 and SCR rear class temperature sensor 14 are separately mounted to the front and back end SCR13；NOx is passed
Sensor 9 is mounted on 15 rear end of silencing means；Environment temperature sensor 16 is mounted on outside exhaust aftertreatment device 1.
It post-processes in electronic control unit 17, main functional modules have: MCU module 18 (MCU: micro-control unit Micro
Controller Unit), data memory module 19, A/D module 20, the power module 21, (CAN: controller of CAN transmission module 22
Local area network Controller Area Network), low-power drive module 23.Wherein, power module 21 and 12V or 24V are straight
Power supply unit connection is flowed, to 18 confession+5V power supply of MCU module and gives 23 offer+5V power supply of low-power drive module.MCU module 18
Physics is established with CAN transmission module 22 be bi-directionally connected and pass through SAE J1939 CAN communication agreement carry out sending and receiving data.
MCU module 18 and low-power drive module 23 establish physical connection, control the driving of low-power drive module 23.MCU module 18
Physics is established with data memory module 19 to be bi-directionally connected, and error code and system are run by SPI protocol by key parameter and are written to
Data are read in data memory module 19 or from data memory module 19.MCU module 18 and A/D module 20 establish physics company
It connects, real-time circulation acquires each channel sensor signal.Low-power drive module 23 and urea injection apparatus 7 establish physical connection,
Electric energy is provided to the heating tube of urea injection apparatus 7.CAN transmission module 22 and urea injection apparatus 7, NOx sensor 9, diesel oil
Injection apparatus 5 is established physics and is bi-directionally connected, and carries out sending and receiving data by SAE J1939 CAN communication agreement.CAN transmission
Module 22 is also established physics with engine electric-controlled unit 2 simultaneously and is bi-directionally connected, and is sent out by SAE J1939 CAN communication agreement
Send and receive data.A/D module 20 and DOC prime temperature sensor 3, DOC rear class temperature sensor 4, DPF differential pressure pickup 6,
SCR prime temperature sensor 8, SCR rear class temperature sensor 14, environment temperature sensor 16 establish physical connection, acquire in real time
The analog signal of each sensor.
18 master chip of MCU module uses MC9S12X model single-chip microcontroller.
The CAN bus driver that 22 master chip of CAN transmission module uses is current mainstream chip TJA1040.
The 3211 P1 DC/DC Power Module of model PKV that the power module 21 uses.
The model 25AA256/25LC256 SPI Serial that 19 master chip of data memory module uses
EEPROM。
The model ICL7104 that the A/D module 20 uses, which is 16 double integrator type analog/digital converters.
Above each module model is one of example, in fact, the module of other identical models of function all can be used.
Second aspect, the present invention also propose a kind of motor exhaust post-processing control method, are according to different sensors
The duty parameter of measured value and engine completes the control of DPF initiative regeneration, DPF dust stratification based on the data model demarcated in advance
Cleaning, four Xiang Gongneng of SCR urea injection control and system fault diagnosis.The data model demarcated in advance refers to: DPF carbon
Carrying capacity prediction model, DPF algorithm policy and DPF control strategy；Extraction flow, dust stratification amount are associated with DPF pressure difference correction factor
It is model；SCR algorithm policy, SCR control strategy；Engine NOx original arranges model, SCR characteristic model, urea injecting quantity algorithm；
Ammonia amount of storage and transformation efficiency relational model, operation transformation efficiency model and DPF initiative regeneration control system and SCR urea spray
Control system is penetrated with program code means, programming to the single-chip microcontroller MC9S12X in the MCU module 18 in post-processing electronic control unit 17
In.Programming has program of lower computer in MCU module 18, and DPF algorithm policy, the DPF control strategy of program of lower computer are mainly used for
Judge whether DPF carrier is removed, DPF carrier whether Severe blockage, whether temperature is excessively high for DPF carrier, whether DPF needs actively
Regeneration controls DPF initiative regeneration process.SCR algorithm policy, the SCR control strategy of program of lower computer are joined according to engine operating condition
Several and SCR state and emission control target determine the amount of injection of urea solution, are entangled in real time according to the value of feedback of NOx sensor 9
Positive urea injecting quantity, it is ensured that the discharge of nitrogen oxides meets the discharge limitation of regulation, cannot cause the secondary pollution of ammonia.Slave computer
Program function of the MCU configuration and single-chip microcontroller peripheral configuration be system must and important function and system correctly run
Most basic function.The acquisition of program of lower computer data and processing be unable to do without the data of the operation sensor of system, especially defeated
The sensor of analog signal out, signal are easy by extraneous interference and to influence the judgement of system.For DPF judgement very
Dependent on the sampled value of differential pressure pickup, and differential pressure pickup, by a variety of data influences, signal fluctuation is bigger unstable, causes
Frequent erroneous judgement, the present invention use " pressure difference dynamic integral, timesharing comparison method " to differential pressure pickup, largely solve
It has determined frequent erroneous judgement problem, so that carrying out DPF initiative regeneration on appropriate opportunity reduces dpf regeneration oil consumption.
Below specific detailed description will be carried out close around this four Xiang Gongneng.
(1), DPF initiative regeneration controls
Carbon carrying capacity reaches 5g/L in DPF, and exhaust resistance increases to the oil consumption for being enough to influence engine, engine electric-controlled unit
2 or post-processing electronic control unit 17 by change engine and post-processing working condition, aoxidize the soot in DPF quickly and go
The process removed is referred to as DPF initiative regeneration.Based on SCR algorithm policy and SCR control strategy, in conjunction with SCR prime temperature sensor 8
Measured value and SCR rear class temperature sensor 14 measured value mean value temperature, using high temperature urea injection strategy or low temperature
Urea injection strategy；It is real based on extraction flow, dust stratification amount and the DPF pressure difference correction factor association relation model demarcated in advance
When prediction DPF pressure difference correction factor and DPF pressure difference is modified, then based on engine exhaust flow, the DPF demarcated in advance
The association relation model of pressure difference and DPF carbon carrying capacity predicts DPF carbon carrying capacity, if the DPF carbon carrying capacity detected reaches or surpasses in real time
Dpf regeneration carbon carrying capacity limit value 5g/L is crossed, then carries out the initiative regeneration of DPF using the method for high-temp combustion carbon particle.
The measured value and DOC rear class temperature sensing of DOC prime temperature sensor 3 are iterated through during DPF initiative regeneration
The measured value of device 4 calculates the front and back temperature difference of DOC, based on the front and back temperature difference of catalytic oxidizer DOC and pre- spray diesel oil model
It calculates and obtains distributive value.The measured value of DOC rear class temperature sensor 4 is controlled at 600 DEG C to 650 DEG C.
Mean value temperature based on engine NOx original row model, SCR characteristic model, urea injecting quantity algorithm and SCR is (before SCR
Grade temperature sensor 8 measured value and SCR rear class temperature sensor 14 measured value mean value temperature) control urea injection
Amount.When the mean value temperature of SCR uses low temperature urea injection strategy at 200 DEG C to 300 DEG C, when the mean value temperature of SCR is greater than 300 DEG C
Shi Caiyong high temperature urea injection strategy.
Because DPF initiative regeneration is periodically, to judge that DPF initiative regeneration opportunity is very important link.DPF
Initiative regeneration it is too early, the initiative regeneration number of DPF will be increased, to increase the oil consumption of DPF initiative regeneration, reduces engine
Fuel economy.If DPF initiative regeneration is too late, since the soot for trapping accumulation in DPF is excessive, engine back pressure is caused
It increases so that the working performance of engine reduces, simultaneously because the soot for trapping accumulation in DPF is excessive, soot oxidizing fire is excessively
Acutely, the excessive velocities for discharging heat cause DPF internal temperature excessively high, and DPF carrier is caused to be burned out, and reduce the reliability of DPF
And durability.General DPF ceramic monolith is more than 700 DEG C and is very easy to burst damage.
DPF initiative regeneration opportunity judgment method: first passing through A/D module 20 and MCU module 18 obtains DPF pressure difference sensing in real time
6 measured value of device, then be associated with based on the inner preparatory extraction flow demarcated of MCU module 18, dust stratification amount with DPF pressure difference correction factor
It is model, predicts DPF pressure difference correction factor in real time and DPF pressure difference is modified, then utilize revised DPF pressure difference,
Association relation model based on the inner preparatory engine exhaust flow demarcated of MCU module 18, DPF pressure difference and DPF carbon carrying capacity again,
DPF carbon carrying capacity is obtained in real time.DPF carbon carrying capacity based on acquisition is limited when reaching the preset dpf regeneration carbon carrying capacity of the present embodiment
When value 45g, initiative regeneration next time is carried out to DPF, is specifically included:
During dpf regeneration, DOC rear class temperature sensor 4 is obtained by A/D module 20 and MCU module 18 in real time
Measured value needs to control diesel injection device 5 toward spraying appropriate bavin in motor exhaust exhaust pipe if this value is less than 600 DEG C
Oil enhances the oxidation reaction degree of DOC10, passes through to improve HC (hydrocarbons Hydrogen Carbonide) concentration of tail gas
DOC10 is high to the calorific value of the oxidation reaction release of HC and concentration is big, so that the outlet temperature of DOC10 is improved, up to 650 DEG C of left sides
It is right.The specifically control of diesel injection device 5: DOC prime temperature sensing is obtained by A/D module 20 and MCU module 18 in real time
The measured value of device 3 and DOC rear class temperature sensor 4, and the difference of the both ends DOC10 temperature is calculated, it is then based on oxidation catalyzer
Regeneration oil spout model in the difference and MCU module 18 of the both ends DOC10 temperature calculates and obtains the pre- distributive value of regeneration, by MCU module
DPF control strategy in 18 controls diesel injection device 5 toward the bavin of the pre- oil spout magnitude of jet regeneration in motor exhaust exhaust pipe
Oil is to improve the HC concentration of tail gas.
After the measured value of DOC rear class temperature sensor 4 is more than or equal to 650 DEG C, control diesel injection device 5 stops spray
Oil prevents DPF internal temperature excessively high, and DPF carrier is caused to be burned out, and reduces the reliability and durability of DPF.When DOC rear class temperature
After the measured value of degree sensor 4 is more than or equal to 600 DEG C, DPF11 regenerative process starts, and the soot of the accumulation of DPF11 trapping at this time exists
Oxidizing fire is discharged at gaseous material under high temperature, to realize the regeneration of DPF, by MCU module 18 DPF algorithm policy and
The inlet air flow temperature of DPF is controlled at 600 DEG C to 650 DEG C and continues to can be completed for 25 to 30 minutes this by DPF control strategy
Secondary dpf regeneration.Such circulate operation, the operation of execution cycle property DPF initiative regeneration.
(2), DPF dust stratification is cleared up
Soot in the particulate matter of DPF11 trapping accumulation can solve by DPF initiative regeneration, but pass through DPF master
After dynamic regeneration, aphlogistic ingredient forms ash (predominantly forming metal oxide after lube oil additive burning) and is trapped in
Inside DPF11, saving bit by bit 30g/L will cause that DPF gas-flow resistance is excessive, and engine back pressure increases the working performance so that engine
It reduces.So the ash content operation i.e. periodicity DPF dust stratification accumulated in periodically cleaning DPF11 is needed to clear up.The periodicity
DPF dust stratification cleaning, because it has periodically, so judging that DPF dust stratification cleaning opportunity is very important link.DPF dust stratification is clear
That manages is too early, will increase the dust stratification clearing times of DPF, to increase the disassembly cleaning dust stratification workload of DPF.If DPF product
Ash cleaning too late, since the ash content accumulated in grain catcher DPF11 is excessive, causes engine back pressure to increase so that engine
Working performance reduce.
The DPF dust stratification clears up opportunity judgment method: the DPF dust stratification amount prediction model being primarily based in MCU module 18 is real
When estimation DPF11 in dust stratification amount, the DPF control strategy being then based in MCU module 18 judge DPF11 set dust stratification amount be
No is more than pre-set limit 270g, if the dust stratification amount of DPF11 estimation is more than or equal to 270g, i.e. warning note needs to dismantle
Grain trap DPF11 simultaneously carries out dust stratification cleaning operation.Such circulate operation, execution cycle property DPF dust stratification cleaning operation.
(3), SCR urea injection control
SCR is SCR technology, is mainly reducing agent using urea, in the reduction of catalysts selective
Under, the nitrogen oxides in tail gas is reduced into nitrogen and water, achievees the purpose that reduce NOx emission.SCR13 is to be coated with catalyst
Carrier, urea injection apparatus 7 toward the misty aqueous solution of urea of mixing chamber 12 inner injection be reducing agent.The urea water that this example uses
Solution is the aqueous solution of urea of diesel locomotive dedicated 32.5%.The urea injection apparatus 7 is misty toward the inner injection of mixing chamber 12
The urea amount of aqueous solution of urea, injection is very crucial, if the urea amount of injection is too low just not to have ideal reduction NOx emission
Effect, if injection the excessively high leakage that will cause NH3 instead of urea amount, cause new pollution.Also due to selective catalysis
Prototype 13 is different with catalyst converter SCR mean value temperature, different to the transfer efficiency of NOx, so the inner SCR control of MCU module 18
Strategy is divided into SCR low temperature control strategy and SCR high-temperature control strategy two parts are introduced respectively.
Before introducing SCR low temperature control strategy and SCR high-temperature control strategy implement method, SCR mean value temperature is first introduced,
It is to obtain SCR prime temperature sensor 8 and SCR rear class temperature sensor 14 in real time by A/D module 20 and MCU module 18
Measured value, and calculate the both ends SCR13 temperature averages.And SCR mean value temperature is judgement using SCR low temperature control strategy or adopts
With the important evidence of SCR high-temperature control strategy.
When SCR mean value temperature between 200 DEG C to 300 DEG C use SCR low temperature control strategy, specifically include:
It first passes through CAN transmission module 22 and MCU module 18 and obtains the real-time of the reading engine of engine electric-controlled unit 2 in real time
Operating condition parameter: revolving speed, accelerator open degree, inlet manifold's pressure, inlet manifold's temperature and torque, then by MCU module 18
Engine NOx original row model data, the SCR characteristic model data in MCU module 18, the SCR being then based in MCU module 18
Algorithm policy, the current aqueous solution of urea the amount of injection of real-time estimation.
By the SCR control policy function module in MCU module 18, it is inner continuous toward mixing chamber 12 to control urea injection apparatus 7
Misty aqueous solution of urea is sprayed, specific the amount of injection is the aqueous solution of urea injection quantity value of real-time estimation.
It is different to the transfer efficiency of NOx since SCR13 is different with mean value temperature, caused by avoiding because of ammonia leakage
Secondary pollution, when mean value temperature is less than 200 DEG C, then the SCR control policy function module control urea injection in MCU module 18
Device 7 stops injection action.When SCR mean value temperature executes the injection behaviour of urea injection apparatus 7 between 200 DEG C to 300 DEG C
Make, but to calculate the ammonia amount of storage in SCR13 simultaneously, and ammonia amount of storage is stored to the EEPROM in data memory module 19 and is deposited
This amount of storage is loaded in reservoir, after system reboot.
When the ammonia amount of storage be greater than the inner preparatory ammonia amount of storage model data demarcated of MCU module 18 upper limit value then by
SCR control policy function module control urea injection apparatus 7 in MCU module 18 stops injection action, avoids because of ammonia leakage
Cause secondary pollution.
Spray is opened based on the ammonia amount of storage of calibration and transformation efficiency relational model, operation transformation efficiency model and ammonia amount of storage
Or stop-spraying.Injection is not sprayed not instead of continuously, and the amount of storage of ammonia is calculated in injection, is then stopped at once when ammonia amount of storage is greater than the upper limit
It only sprays, starts to spray at once when being lower than lower limit, always by the amount of storage control of ammonia in the range determined by testing.
SCR high-temperature control strategy is used when SCR mean value temperature is greater than 300 DEG C, is specifically included:
It first passes through CAN transmission module 22 and MCU module 18 and obtains the real-time of the reading engine of engine electric-controlled unit 2 in real time
Operating condition parameter: revolving speed, accelerator open degree, inlet manifold's pressure, inlet manifold's temperature and torque, then by MCU module 18
Engine NOx original row model data, the SCR characteristic model data in MCU module 18, the SCR being then based in MCU module 18
Algorithm policy, the current aqueous solution of urea the amount of injection of real-time estimation.
By the SCR control policy function module in MCU module 18, it is inner continuous toward mixing chamber 12 to control urea injection apparatus 7
Misty aqueous solution of urea is sprayed, specific the amount of injection is the aqueous solution of urea injection quantity value of the real-time estimation.
On the basis of the various embodiments described above, carried out in high-temperature control strategic process in SCR, further includes: SCR mean value temperature
Greater than 300 DEG C and after continuing 1 minute, the ammonia amount of storage stored in the eeprom memory in data memory module 19 is reset.
In SCR high-temperature control process, keep urea injection apparatus 7 toward the inner continuous state for spraying misty aqueous solution of urea of mixing chamber 12.
It is anti-that the SCR control policy function module starts selective oxidation reduction in implementation procedure, then in SCR13
It answers.
The SCR control policy function module obtains NOx in implementation procedure, through A/D module 20 and MCU module 18
Sensor 9 surveys the NOx concentration value of emission, as an important feedback parameters in SCR control strategy, is based on MCU mould
The amount for the aqueous solution of urea that urea injecting quantity algorithm adjustment urea injection apparatus 7 in block 18 sprays.
But the NOx concentration value of the actual measurement emission, it can only be as an important ginseng in SCR control strategy
Amount cannot carry out closed-loop control with this feedback parameters.Because a large amount of ammonia can be stored under SCR13 low temperature, dash forward from low temperature to high temperature
These ammonia can release during change, the NOx sensor 9 of commercialization at present there is also pitching sensitive issue to NH3, that is,
In the presence of ammonia, measurement result can be caused bigger than normal, remained some problems as closed-loop control by NH3 as NOx, thus
The present invention is using opened loop control.So circulation completes the control of SCR selective oxidation reduction reaction.
(4), system fault diagnosis
Error code is stored to data if monitoring failure and is stored by the working condition for monitoring above-mentioned each temperature sensor
In eeprom memory in module 19, in the eeprom memory in breakdown maintenance Shi Zaicong data memory module 19 in the future
Read failure code.
A) it is considered as short trouble when temperature sensor measured value remains -40 DEG C；When temperature sensor measured value begins
It keeps being considered as open circuit fault at 1000 DEG C eventually.
B) environment temperature sensor 16 urea injection apparatus computer heating control: is obtained by A/D module 20 and MCU module 18
Measured value controls low-power drive module 23 by MCU module 18 when the measured value of environment temperature sensor 16 is lower than -5 DEG C and opens
The heating electromagnetic valve for opening urea injection apparatus 7 is begun to warm up, and prevents urea for vehicle aqueous crystallization；When environment temperature sensor 16
Measured value be greater than 0 DEG C when by MCU module 18 control low-power drive module 23 close urea injection apparatus 7 heating electromagnetic valve
Stop heating.
C) effect of the silencing means 15 is noise caused by when reducing exhaust emissions, then apart from final exhaust emissions end
Measurement noise figure is not more than 85dBA at the distance of 1 meter of mouth, and noise circumstance pollution is effectively reduced, meets ambient noise discharge standard
Requirement.
Control device embodiment described above is only schematical, wherein component shown as a unit can be
Or it may not be physical unit, it can it is in one place, or may be distributed over multiple network units.It can be with
Some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment according to the actual needs.
The above examples are only used to illustrate the technical scheme of the present invention, rather than its limitations；Although referring to above-described embodiment
Invention is explained in detail, so that those skilled in the art will readily recognize that；But it still can be to above-mentioned each reality
Technical solution documented by example is applied to modify or equivalent replacement of some of the technical features；And these modification or
Person's replacement, the range for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of motor exhaust post-processes control system, which is characterized in that including exhaust aftertreatment device, engine electric-controlled list
Member, diesel injection device, urea injection apparatus, post-processing electronic control unit；
The exhaust aftertreatment device is connected on exhaust pipe, in exhaust aftertreatment device, DOC, DPF, mixing chamber, SCR and is disappeared
Mixer successively encapsulates from front to back；Several sensors are equipped on exhaust aftertreatment device；The spray of the diesel injection device
It penetrates head to be satisfied in the exhaust pipe of the front end DOC, by diesel injection into exhaust pipe；The injector head of the urea injection apparatus is satisfied with
In mixing chamber, urea is ejected into the mixing chamber of the front end SCR.
2. motor exhaust according to claim 1 post-processes control system, which is characterized in that the sensor packet
Include: DOC prime temperature sensor, DOC rear class temperature sensor, DPF differential pressure pickup, SCR prime temperature sensor, NOx are passed
Sensor, SCR rear class temperature sensor；The DOC prime temperature sensor and DOC rear class temperature sensor is separately mounted to
The front and back end DOC；The DPF differential pressure pickup band is separately mounted to the front and back end DPF there are two sensor, detection DPF into and out of
Pressure difference between gas；SCR prime temperature sensor and SCR rear class temperature sensor are separately mounted to the front and back end SCR；NOx sensor
It is mounted on silencing means rear end.
3. motor exhaust according to claim 1 post-processes control system, which is characterized in that post-processing electronic control unit
In, main functional modules have: MCU module, data memory module, A/D module, power module, CAN transmission module, low-power are driven
Dynamic model block.
4. motor exhaust according to claim 3 post-processes control system, which is characterized in that power module and 12V or
The connection of 24V DC power supply apparatus to MCU module confession+5V power supply and gives low-power drive module offer+5V power supply；MCU module and
CAN transmission module, which is established physics and is bi-directionally connected, to be carried out sending and receiving data；MCU module and low-power drive module establish physics
Connection controls the driving of low-power drive module；MCU module is established physics with data memory module and is bi-directionally connected, and is assisted by SPI
View is written in data memory module or reads from data memory module data error code and system operation key parameter；
MCU module and A/D module establish physical connection, and real-time circulation acquires each channel sensor signal；Low-power drive module and urine
Plain injection apparatus establishes physical connection, provides electric energy to the heating tube of urea injection apparatus；CAN transmission module and urea injection fill
Set, NOx sensor, diesel injection device are established physics and are bi-directionally connected, carry out sending and receiving data；CAN transmission module is simultaneously
Physics also is established with engine electric-controlled unit 2 to be bi-directionally connected, and carries out sending and receiving data；A/D module 20 and DOC prime temperature
Sensor 3, DOC rear class temperature sensor 4, DPF differential pressure pickup 6, SCR prime temperature sensor 8, SCR rear class temperature sensing
Device 14, environment temperature sensor 16 establish physical connection, acquire the analog signal of each sensor in real time.
5. motor exhaust according to claim 3 post-processes control system, which is characterized in that the MCU module master
Chip uses MC9S12X model single-chip microcontroller；The CAN bus driver that the CAN transmission module master chip uses is master at present
Flow chip TJA1040；The model 25AA256/25LC256 SPI Serial that the data memory module master chip uses
EEPROM；The model ICL7104 that the A/D module uses, which is 16 double integrator type analog/digital converters；Described
The 3211 P1 DC/DC Power Module of model PKV that power module uses.
6. motor exhaust according to claim 1 or 2 post-processes control system, which is characterized in that the sensor
It further include environment temperature sensor, environment temperature sensor is mounted on outside exhaust aftertreatment device.
7. a kind of motor exhaust post-processes control method, which is characterized in that according to different sensor measured values and engine
Duty parameter the control of DPF initiative regeneration is completed, DPF dust stratification is cleared up, SCR urea is sprayed based on data model demarcate in advance
Penetrate four Xiang Gongneng of control and system fault diagnosis；
The data model demarcated in advance refers to: DPF carbon carrying capacity prediction model, DPF algorithm policy and DPF control strategy；
Extraction flow, dust stratification amount and DPF pressure difference correction factor association relation model；SCR algorithm policy, SCR control strategy；Engine
NOx original arranges model, SCR characteristic model, urea injecting quantity algorithm；Ammonia amount of storage and transformation efficiency relational model, operation conversion effect
Rate model and DPF initiative regeneration control system and SCR urea jet control system are with program code means, programming to post-processing
In MCU module in electronic control unit.
8. control method according to claim 7, which is characterized in that four Xiang Gongneng are as follows:
(1), DPF initiative regeneration controls
Based on SCR algorithm policy and SCR control strategy, passed in conjunction with the measured value and SCR rear class temperature of SCR prime temperature sensor
The mean value temperature of the measured value of sensor, using high temperature urea injection strategy or low temperature urea injection strategy；Based on preparatory calibration
Good extraction flow, dust stratification amount and DPF pressure difference correction factor association relation model, real-time prediction DPF pressure difference correction factor are simultaneously right
DPF pressure difference is modified, then the incidence relation based on the engine exhaust flow, DPF pressure difference and DPF carbon carrying capacity demarcated in advance
Model predicts that DPF carbon carrying capacity is adopted if the DPF carbon carrying capacity detected meets or exceeds dpf regeneration carbon carrying capacity limit value in real time
The initiative regeneration of DPF is carried out with the method for high-temp combustion carbon particle；DOC prime temperature is iterated through during DPF initiative regeneration
The measured value of sensor and the measured value of DOC rear class temperature sensor calculate the front and back temperature difference of DOC, are based on catalytic oxidizer
The front and back temperature difference of DOC and pre- spray diesel oil model calculate and obtain distributive value；
(2), DPF dust stratification is cleared up
After DPF initiative regeneration, aphlogistic ingredient forms ash and is trapped in inside DPF, saves bit by bit a certain amount of, needs week
The dust stratification of phase property is cleared up；
(3), SCR urea injection control
SCR control strategy is divided into two kinds of SCR low temperature control strategy and SCR high-temperature control strategy in MCU module；As catalyst converter SCR
Mean value temperature uses SCR low temperature control strategy between 200 DEG C to 300 DEG C, uses when SCR mean value temperature is greater than 300 DEG C
SCR high-temperature control strategy；
(4), system fault diagnosis
The working condition for monitoring above-mentioned each temperature sensor stores error code to data memory module if monitoring failure
In, for read failure code in breakdown maintenance Shi Zaicong data memory module in the future；
A) it is considered as short trouble when temperature sensor measured value remains -40 DEG C；When temperature sensor measured value is protected always
It is considered as open circuit fault when holding 1000 DEG C；
B) urea injection apparatus computer heating control: obtaining the measured value of environment temperature sensor by A/D module and MCU module, when
When the measured value of environment temperature sensor is lower than -5 DEG C, urea injection apparatus is opened by MCU module control low-power drive module
Heating electromagnetic valve begin to warm up, prevent urea for vehicle aqueous crystallization；When the measured value of environment temperature sensor is greater than 0 DEG C
Heating is stopped by the heating electromagnetic valve that MCU module control low-power drive module closes urea injection apparatus；
C) effect of the silencing means is noise caused by when reducing exhaust emissions, apart from 1 meter of final exhaust emissions port
Distance at measurement noise figure be not more than 85dBA, be effectively reduced noise circumstance pollution, meet wanting for ambient noise discharge standard
It asks.
9. control method according to claim 8, which is characterized in that
In function (1): dpf regeneration carbon carrying capacity limit value 5g/L；The measured value of DOC rear class temperature sensor is controlled at 600 DEG C to 650
DEG C, after the measured value of DOC rear class temperature sensor is more than or equal to 650 DEG C, control diesel injection device stops oil spout.
In function (2), described saving bit by bit is a certain amount of for 30g/L, at this time progress DPF dust stratification cleaning.
In function (3), when the mean value temperature of SCR uses low temperature urea injection strategy at 200 DEG C to 300 DEG C, when the mean value temperature of SCR
Degree uses high temperature urea injection strategy when being greater than 300 DEG C.
10. control method according to claim 8 or claim 9, which is characterized in that in the function (3),
The SCR low temperature control strategy specifically includes:
It first passes through CAN transmission module and MCU module and obtains the real time execution operating condition that engine electric-controlled unit reads engine in real time
Parameter: revolving speed, accelerator open degree, inlet manifold's pressure, inlet manifold's temperature and torque, then pass through the engine NOx in MCU module
Catalyst converter SCR characteristic model data in original row model data, MCU module, the SCR algorithm policy being then based in MCU module,
The current aqueous solution of urea the amount of injection of real-time estimation；By the SCR control policy function module in MCU module, urea injection dress is controlled
Misty aqueous solution of urea is continuously sprayed in setting toward mixing chamber, specific the amount of injection is the aqueous solution of urea injection quantity value of real-time estimation；
The SCR high-temperature control strategy specifically includes:
It first passes through CAN transmission module and MCU module and obtains the real time execution operating condition that engine electric-controlled unit reads engine in real time
Parameter: revolving speed, accelerator open degree, inlet manifold's pressure, inlet manifold's temperature and torque, then pass through the engine NOx in MCU module
Catalyst converter SCR characteristic model data in original row model data, MCU module, the SCR algorithm policy being then based in MCU module,
The current aqueous solution of urea the amount of injection of real-time estimation；By the SCR control policy function module in MCU module, urea injection dress is controlled
Misty aqueous solution of urea is continuously sprayed in setting toward mixing chamber, specific the amount of injection is that the aqueous solution of urea of the real-time estimation sprays
Magnitude.
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