CN106224061B - A kind of engine discharge control method and device - Google Patents
A kind of engine discharge control method and device Download PDFInfo
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- CN106224061B CN106224061B CN201610769157.XA CN201610769157A CN106224061B CN 106224061 B CN106224061 B CN 106224061B CN 201610769157 A CN201610769157 A CN 201610769157A CN 106224061 B CN106224061 B CN 106224061B
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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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
-
- 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)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Supercharger (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The embodiment of the invention discloses a kind of engine discharge control method and devices.This method includes：Obtain the rotary speed information and distributive value of engine；The working region of engine is searched in pre-established database according to rotary speed information and distributive value, has rotary speed information and distributive value and the correspondence of working region in pre-established database；If engine is in the first working region, efficient SCR system control strategy is used；If lookup knows that engine is in the second working region, the control strategy after being combined using egr system control strategy and efficient SCR system control strategy；Wherein, pressure is more than pressure before turbine after being pressurized in the first working region；Pressure is less than pressure before turbine after being pressurized in second working region.The embodiment of the present invention executes corresponding control strategy by dividing the working region of engine to different operating region, compared with prior art, has the advantages that reduce oil consumption, the row's of raising temp effect.
Description
Technical field
The present embodiments relate to technical field of engines, and in particular to a kind of engine discharge control method and device.
Background technology
To meet requirement of six regulation of Europe to discharge, the mainstream technology route of EGR+DOC+DPF+SCR is widely adopted, adopts
With such technology path due to the introducing of EGR, original machine NOx has been reduced to fairly horizontal, and the transformation efficiency of SCR only need to be 90%
Left and right can meet the requirement of emission regulation,
But the high EGR rate in the general range of the full arteries and veins of engine is needed using EGR routes, to meet the needs of high EGR rate work
Usually VGT (pressure booster with variable cross section) or two-step supercharging is applied to provide stable driving pressure difference for egr system in journey, this is just bound to
High boost presence, higher boost pressure is caused to cause explosion pressure in cylinder higher, it is often necessary to which engine is on body design
Strengthened to meet the requirement of reliability.In addition, the introducing of EGR and VGT causes engine control complex, oil consumption is high,
Of high cost, the in addition introducing of electronic component also results in engine reliability reduction, market inconvenient maintenance etc..
Also occur using only efficient SCR (transformation efficiency the is more than 95%) technology paths for meeting the discharge of Europe six at present
(DOC+DPF+Hi-SCR), it need not be improved on engine body using efficient SCR technology and eliminate regular course
In EGR and VGT, but during realizing the embodiment of the present invention, inventor has found that efficient SCR technology equally exists many and asks
Topic：
1) engine original machine NOx emission is higher, needs to keep higher NOx conversion efficiency in engine Life cycle
(Life cycle is more than 95%)；
2) need higher delivery temperature to ensure high NOx conversion efficiency, especially middle-low load；
3) rational Selection of Catalyst and the urea injection control strategy etc. of complexity are needed.
Invention content
One purpose of the embodiment of the present invention is to be combined egr system control strategy and efficient SCR system control strategy
It is higher to solve existing emission control scheme oil consumption, the poor problem of row's temp effect.
The embodiment of the present invention proposes a kind of engine discharge control method, including：
Obtain the rotary speed information and distributive value of the engine；
The work for knowing the engine is searched in pre-established database according to the rotary speed information and the distributive value
Region has the correspondence of the rotary speed information and the distributive value and working region in the pre-established database；
If lookup knows that the engine is in the first working region, efficient SCR system control strategy is used；
If lookup knows that the engine is in the second working region, egr system control strategy and efficient SCR systems are used
Control strategy after system control strategy combination；
Wherein, pressure is more than pressure before turbine after the supercharging of engine described in first working region；Described second
Pressure is less than pressure before turbine after the supercharging of engine described in working region.
Preferably, it if the lookup knows that the engine is in the first working region, is controlled using efficient SCR system
The step of strategy specifically includes：
Know that the engine be in the first working region if searching, detects in acquisition particle capture treated tail gas
The content of nitrogen oxide NOx, and according to the emitted dose of the content of NOx control urea.
Preferably, if the lookup knows that the engine is in the second working region, egr system control strategy is used
It is specifically included with the step of efficient SCR system control strategy：
If lookup knows that the engine is in the second working region, controlled according to the exhausted air quantity of Venturi tube acquisition
The aperture of EGR valve, to control amount of recirculated exhaust gas；
Detection obtains the content of particle capture treated nitrogen oxide in tail gas NOx, and is controlled and urinated according to the content of NOx
The emitted dose of element.
Preferably, if the lookup knows that the engine is in the second working region, egr system control strategy is used
It is specifically included with the step of efficient SCR system control strategy：
If lookup knows that the engine is in the second working region, the fresh sky acquired according to intake flow sensor
Gas air inflow controls the aperture of EGR valve, to control new charge amount；
Detection obtains the content of particle capture treated nitrogen oxide in tail gas NOx, and is controlled and urinated according to the content of NOx
The emitted dose of element.
Preferably, the rotary speed information is acquired by the speed probe pre-seted and is obtained；The distributive value is adopted by fuel injector
Collection obtains.
As shown from the above technical solution, the engine discharge control method that the embodiment of the present invention proposes is by dividing engine
Working region, and corresponding control strategy is executed to different operating region, compared with prior art, having reduces oil consumption, carries
The advantages of height row's temp effect.
The invention also provides a kind of Exhaust Control of Engine devices, including：
First acquisition module, rotary speed information and distributive value for obtaining the engine；
Searching module, for searched in pre-established database according to the rotary speed information and the distributive value know it is described
The working region of engine has pair of the rotary speed information and the distributive value and working region in the pre-established database
It should be related to；
First processing module uses efficient SCR systems if knowing that the engine is in the first working region for searching
System control strategy；
Second processing module uses egr system control if knowing that the engine is in the second working region for searching
Control strategy after system strategy and the combination of efficient SCR system control strategy；
Wherein, pressure is more than pressure before turbine after the supercharging of engine described in first working region；Described second
Pressure is less than pressure before turbine after the supercharging of engine described in working region.
Preferably, the first processing module, if knowing that the engine is in the first working region specifically for searching,
The content for obtaining particle capture treated nitrogen oxide in tail gas NOx is then detected, and controls the spray of urea according to the content of NOx
The amount of penetrating.
Preferably, the Second processing module, if specifically for including searching to know that the engine is in the second work
Region then controls the aperture of EGR valve, to control amount of recirculated exhaust gas according to the exhausted air quantity of Venturi tube acquisition；Detection acquisition
Grain captures the content of treated nitrogen oxide in tail gas NOx, and the emitted dose of urea is controlled according to the content of NOx.
Preferably, the Second processing module, if knowing that the engine is in the second working region specifically for searching,
The aperture that EGR valve is then controlled according to the FAI Fresh Air Intake amount of intake flow sensor acquisition, to control new charge amount；Detection
The content of particle capture treated nitrogen oxide in tail gas NOx is obtained, and controls the emitted dose of urea according to the content of NOx
Preferably, the rotary speed information is acquired by the speed probe pre-seted and is obtained；The distributive value is adopted by fuel injector
Collection obtains.
As shown from the above technical solution, the Exhaust Control of Engine device that the embodiment of the present invention proposes is by dividing engine
Working region, and corresponding control strategy is executed to different operating region, compared with prior art, having reduces oil consumption, carries
The advantages of height row's temp effect.
Description of the drawings
The features and advantages of the present invention can be more clearly understood by reference to attached drawing, attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 shows the flow diagram for the engine discharge control method that one embodiment of the invention provides；
Fig. 2 a and Fig. 2 b show the structural schematic diagrams for the engine emissions control system that one embodiment of the invention provides；
Fig. 3 shows that working region divides schematic diagram in the engine discharge control method that one embodiment of the invention provides；
Fig. 4 shows the oil consumption pair for the engine discharge control method and existing control strategy that one embodiment of the invention provides
Than figure；
Fig. 5 shows the discharge temperature for the engine discharge control method and existing control strategy that one embodiment of the invention provides
Spend comparison diagram；
Fig. 6 shows the structural schematic diagram for the Exhaust Control of Engine device that one embodiment of the invention provides.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 shows the flow diagram for the engine discharge control method that one embodiment of the invention provides, referring to Fig. 1,
This method includes：
110, the rotary speed information and distributive value of the engine are obtained；
It should be noted that electronic control unit ECU receives the rotary speed information that preset value speed probe is sent and spray
The distributive value of oily device；
The position of speed probe can depend on the needs；Fuel injector is typically mounted at the side of engine cylinder body, can be arranged
ECU obtains distributive value in real time；
120, it is searched in pre-established database according to the rotary speed information and the distributive value and knows the engine
Working region has the correspondence of the rotary speed information and the distributive value and working region in the pre-established database；
It will be appreciated that this programme determines the working region of engine based on rotary speed information and distributive value, for arbitrary group
The rotary speed information and distributive value of conjunction have and only there are one corresponding working regions；
If 130, searching and knowing that the engine is in the first working region, efficient SCR system control strategy is used；
It will be appreciated that due to after the supercharging of engine described in the first working region pressure be more than turbine before pressure, because
This exhaust gas can not recycle, and efficient SCR system control strategy is only applied in the first working region；
If 140, searching and knowing that the engine is in the second working region, using egr system control strategy and efficiently
Control strategy after the combination of SCR system control strategy；
It should be noted that pressure is less than pressure before turbine after the supercharging of engine described in the second working region；At this point,
One side exhaust gas is recyclable, and on the other hand, efficient SCR system control strategy is also applicable, therefore, in the second working region
This programme uses the efficient SCR system control strategies of EGR+.
The present embodiment executes corresponding control strategy by dividing the working region of engine to different operating region,
Compared with prior art, have the advantages that reduce oil consumption, the row's of raising temp effect.
In a possible embodiments, before step 120, this method further includes：Obtain the model of the engine；
Correspondingly, step 120 specifically includes：
Corresponding tables of data is found in the pre-established database according to the model of the engine, it is described pre-established
There is the corresponding tables of data of each model engine in database；
The workspace for knowing the engine is searched in the tables of data according to the rotary speed information and the distributive value
Domain.
It should be noted that for the engine of different model, working region is not quite similar, and therefore, in ECU has each
The engine of model and tables of data with model associations；In practical applications, according to the model of target engine from database
In find corresponding tables of data, and the working region of target engine is determined based on the tables of data.
The present embodiment is arranged corresponding tables of data for the engine of different model and is reached with improving the applicability of product
Convenient for the purpose of popularization.
Fig. 2 a and Fig. 2 b show the structural schematic diagram for the engine emissions control system that one embodiment of the invention provides, ginsengs
See Fig. 2 a and Fig. 2 b, structure that there are two types of the systems,
In the first structure, Fig. 2 a are seen, which includes：Air filter, intake flow sensor, WG boosters, charge air cooler,
Throttle valve and efficiently SCR system and egr system；Wherein,
Efficiently SCR system includes：Oxidation catalytic converter DOC, particle trap and efficient SCR catalytic converter；
Egr system includes：EGR valve and cooler for recycled exhaust gas；
In second of structure, Fig. 2 b are seen, which includes air filter, WG boosters, charge air cooler and efficient SCR system
And egr system；Wherein,
Efficiently SCR system includes：Oxidation catalytic converter DOC, particle trap and efficient SCR catalytic converter；
Egr system includes：Venturi tube, EGR valve and cooler for recycled exhaust gas；
Schematic diagram is divided referring to the working region shown in Fig. 3, this programme is for the division principle of engine working area：
If driving pressure difference after supercharging before pressure P2 and turbine between pressure P3 is first there is no driving pressure difference between P2 and P3
Working region (region 1 in Fig. 3)；If there is driving pressure difference between P2 and P3, for the second working region (region in Fig. 3
2)；
Transverse and longitudinal coordinate in Fig. 3 is torque, and the concrete numerical value of torque, which is subject to, tests.
Correspondingly, if there is no driving pressure differences between P2 and P3, then EGR valve can not form exhaust gas recycling, therefore,
Egr system cannot achieve emission control effect；, and since the first working region many places are in middle high load capacity, comparatively arrange warm ratio
It is higher, therefore, efficient SCR system control logic is used at this time；
If there is driving pressure difference between P2 and P3, efficient SCR system and efficient SCR system can be achieved emission control and make
With；Therefore, control logic at this time is divided into two parts, and first part is completed by egr system control strategy, specific embodiment packet
It includes following two：
If first, system is second of structure, and searches and know that the engine is in the second working region, then according to text
The aperture of the exhausted air quantity control EGR valve of venturi acquisition, to control amount of recirculated exhaust gas；
Detection obtains the content of particle capture treated nitrogen oxide in tail gas NOx, and is controlled and urinated according to the content of NOx
The emitted dose of element.
It will be appreciated that the aperture of control EGR valve is equivalent to the flow of control EGR gas, realize that control recycling is useless
The purpose of tolerance participates in combustion process again moreover, introducing exhaust gas into fresh control, to reduce the Nox in engine original machine
Discharge；
If second, system be the first structure, and search know that the engine be in the second working region, then basis into
The aperture of the FAI Fresh Air Intake amount control EGR valve of mass-air-flow sensor acquisition, to control new charge amount；
Detection obtains the content of particle capture treated nitrogen oxide in tail gas NOx, and is controlled and urinated according to the content of NOx
The emitted dose of element.
Second part is completed by efficient SCR system control logic, and specific embodiment includes：
Know that engine be in the first working region if searching, detects nitrogen oxygen in acquisition particle capture treated tail gas
The content of compound NOx, and according to the emitted dose of the content of NOx control urea.
Fig. 4 and Fig. 5 respectively illustrates the engine discharge control method of one embodiment of the invention offer and existing control plan
Oil consumption comparison diagram slightly and exhaust temperature comparison diagram；According to Fig. 4 and Fig. 5 the invention has the advantages that：
1) common vent valve booster pressure especially before high velocity (most of in the second working region) its whirlpool is used
P3 is larger, and big discharge back pressure causes engine pumping loss larger, and engine consumption is higher, and at this time in the second working region
The unlatching of EGR valve reduces the pressure of P3 before whirlpool just, reduces the pumping loss of engine, this region oil consumption has apparent
Advantage, as shown in Fig. 3 test datas.
2) the first working region many places are in middle high load capacity, and comparatively row's temperature is relatively high, this region is controlled using Hi-SCR
Discharge is easier to realize.
3) the second working region is due to the introducing of EGR, and into the new charge amount reduction of engine, row's temperature of engine is more
Height, is more advantageous to the control of discharge, and Fig. 4 show test result, it can be seen that the middle-low load of the second working region puies forward row's temperature
(50 DEG C) with obvious effects.
4) the second working region reduces the discharge of engine original machine NOx due to the introducing of EGR, alleviates the work of SCR
Burden, while decreasing urea injecting quantity.
5) compared to VGT boosters, efficient SCR uses common vent valve booster, and control is simple, easy to maintenance and more
Has cost advantage.
For method embodiment, for simple description, therefore it is all expressed as a series of combination of actions, but ability
Field technique personnel should know that embodiment of the present invention is not limited by the described action sequence, because according to the present invention
Embodiment, certain steps can be performed in other orders or simultaneously.Next, those skilled in the art should also know that,
Embodiment described in this description belongs to preferred embodiment, involved action embodiment party not necessarily of the present invention
Necessary to formula.
Fig. 6 shows the structural schematic diagram for the Exhaust Control of Engine device that one embodiment of the invention provides, referring to Fig. 6,
The Exhaust Control of Engine device, including：First acquisition module 61, searching module 62, at first processing module 63 and second
Manage module 64；Wherein,
First acquisition module 61, rotary speed information and distributive value for obtaining the engine；
Searching module 62 knows institute for being searched in pre-established database according to the rotary speed information and the distributive value
The working region of engine is stated, has the rotary speed information and the distributive value and working region in the pre-established database
Correspondence；
First processing module 63 uses efficient SCR if knowing that the engine is in the first working region for searching
System control strategy；
Second processing module 64 uses egr system if knowing that the engine is in the second working region for searching
Control strategy after control strategy and the combination of efficient SCR system control strategy；
Wherein, pressure is more than pressure before turbine after the supercharging of engine described in first working region；Described second
Pressure is less than pressure before turbine after the supercharging of engine described in working region.
It should be noted that the first acquisition module 61 receives the rotating speed letter for the engine for pre-seting speed probe detection
Breath, and the distributive value of fuel injector is obtained, rotary speed information and distributive value are sent to searching module 62；Searching module 62 calls built in advance
Vertical database, and the working region of engine corresponding with rotary speed information and distributive value is found in the database；And it will packet
Information containing working region is sent to corresponding processing module, if what is found is the first working region, which is sent
To first processing module 63, the discharge of engine is controlled based on efficient SCR system control strategy by first processing module 63
System；If what is found is the second working region, corresponding informance is sent to Second processing module 64, by Second processing module 64
The discharge of engine is controlled based on egr system control strategy and efficient SCR system control strategy,
The present embodiment is by dividing the working region of engine as a result, and executes corresponding control to different operating region
Strategy has the advantages that reduce oil consumption, the row's of raising temp effect compared with prior art.
For device embodiments, since it is substantially similar to method embodiment, so description is fairly simple,
Related place illustrates referring to the part of method embodiment.
In a possible embodiments, which further includes：Second acquisition module；
Second acquisition module according to the rotary speed information and the distributive value in pre-established database for looking into
It looks for before the working region for knowing the engine, obtains the model of the engine；
Correspondingly, the searching module 62 is specifically used for the model according to the engine in the pre-established database
Corresponding tables of data is found, has the corresponding tables of data of each model engine in the pre-established database；According to described turn
Fast information and the distributive value search the working region for knowing the engine in the tables of data.
For device embodiments, since it is substantially similar to method embodiment, so description is fairly simple,
Related place illustrates referring to the part of method embodiment.
In the present embodiment, if the first processing module 63, which is specifically used for searching, knows that the engine is in the first work
The content for obtaining particle capture treated nitrogen oxide in tail gas NOx is then detected, and is controlled and is urinated according to the content of NOx in region
The emitted dose of element.
In the present embodiment, if the Second processing module 64 is specifically used for including searching to know that the engine is in second
Working region then controls the aperture of EGR valve, to control amount of recirculated exhaust gas according to the exhausted air quantity of Venturi tube acquisition；Detection obtains
Particle capture is taken treated the content of nitrogen oxide in tail gas NOx, and controls the emitted dose of urea according to the content of NOx.
In another possible embodiments, if Second processing module 64, which is specifically used for searching, knows that the engine is in second
Working region, then according to intake flow sensor acquisition FAI Fresh Air Intake amount control EGR valve aperture, with control it is fresh into
Tolerance；Detection obtains the content of particle capture treated nitrogen oxide in tail gas NOx, and controls urea according to the content of NOx
Emitted dose.
For device embodiments, since it is substantially similar to method embodiment, so description is fairly simple,
Related place illustrates referring to the part of method embodiment.
It should be noted that the implementation method of above-mentioned apparatus includes：Increase function module in ECU, or individually sets
A processor is found, is no longer defined herein.
It should be noted that in all parts of the device of the invention, according to the function that it to be realized to therein
Component has carried out logical partitioning, and still, the present invention is not only restricted to this, all parts can be repartitioned as needed or
Person combines.
The all parts embodiment of the present invention can be with hardware realization, or to transport on one or more processors
Capable software module is realized, or is realized with combination thereof.In the present apparatus, PC is by realizing internet to equipment or device
The step of remote control, accurately control device or device each operate.The present invention is also implemented as executing here
Some or all equipment or program of device of described method are (for example, computer program and computer program production
Product).The program of the present invention, which is achieved, may be stored on the computer-readable medium, and the file or document tool that program generates
Having can be statistical, generates data report and cpk reports etc., and batch testing can be carried out to power amplifier and is counted.On it should be noted that
Stating embodiment, the present invention will be described rather than limits the invention, and those skilled in the art are not departing from
Replacement embodiment can be designed in the case of attached the scope of the claims.It in the claims, should not will be between bracket
Any reference mark be configured to limitations on claims.Word "comprising" does not exclude the presence of member not listed in the claims
Part or step.Word "a" or "an" before element does not exclude the presence of multiple such elements.The present invention can borrow
Help include the hardware of several different elements and be realized by means of properly programmed computer.If listing equipment for drying
Unit claim in, several in these devices can be embodied by the same hardware branch.Word first,
Second and the use of third etc. do not indicate that any sequence.These words can be construed to title.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case of bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (4)
1. a kind of engine discharge control method, which is characterized in that including：
Obtain the rotary speed information and distributive value of the engine；
The working region for knowing the engine is searched in pre-established database according to the rotary speed information and the distributive value,
There is the correspondence of the rotary speed information and the distributive value and working region in the pre-established database；
If lookup knows that the engine is in the first working region, efficient SCR system control strategy is used；
If lookup knows that the engine is in the second working region, egr system control strategy and efficient SCR system control are used
Control strategy after system strategy combination；
Wherein, pressure is more than pressure before turbine after the supercharging of engine described in first working region；Second work
Pressure is less than pressure before turbine after the supercharging of engine described in region；
Wherein, if the lookup knows that the engine is in the first working region, using efficient SCR system control strategy
Step specifically includes：
Know that the engine be in the first working region if searching, detects nitrogen oxygen in acquisition particle capture treated tail gas
The content of compound NOx, and according to the emitted dose of the content of NOx control urea；
Wherein, if the lookup knows that the engine is in the second working region, using egr system control strategy and efficiently
The step of SCR system control strategy, specifically includes：
If lookup knows that the engine is in the second working region, EGR valve is controlled according to the exhausted air quantity of Venturi tube acquisition
Aperture, to control amount of recirculated exhaust gas；
Detection obtains the content of particle capture treated nitrogen oxide in tail gas NOx, and controls urea according to the content of NOx
Emitted dose；
Wherein, if the lookup knows that the engine is in the second working region, using egr system control strategy and efficiently
The step of SCR system control strategy, specifically includes：
If search know that the engine be in the second working region, according to intake flow sensor acquire fresh air into
Tolerance controls the aperture of EGR valve, to control new charge amount；
Detection obtains the content of particle capture treated nitrogen oxide in tail gas NOx, and controls urea according to the content of NOx
Emitted dose.
2. according to the method described in claim 1, it is characterized in that, the rotary speed information is acquired by the speed probe pre-seted
It obtains；The distributive value is acquired by fuel injector and is obtained.
3. a kind of Exhaust Control of Engine device, which is characterized in that including：
First acquisition module, rotary speed information and distributive value for obtaining the engine；
Searching module knows described start for being searched in pre-established database according to the rotary speed information and the distributive value
The working region of machine has the rotary speed information in the pre-established database and the distributive value is corresponding with working region closes
System；
First processing module uses efficient SCR system control if knowing that the engine is in the first working region for searching
System strategy；
Second processing module controls plan if knowing that the engine is in the second working region for searching using egr system
Control strategy after slightly being combined with efficient SCR system control strategy；
Wherein, pressure is more than pressure before turbine after the supercharging of engine described in first working region；Second work
Pressure is less than pressure before turbine after the supercharging of engine described in region；
Wherein, the first processing module detects if knowing that the engine is in the first working region specifically for searching
The content of particle capture treated nitrogen oxide in tail gas NOx is obtained, and controls the emitted dose of urea according to the content of NOx；
Wherein, the Second processing module, if specifically for including searching to know that the engine is in the second working region,
The aperture that EGR valve is controlled according to the exhausted air quantity of Venturi tube acquisition, to control amount of recirculated exhaust gas；Detection obtains at particle capture
The content of nitrogen oxide in tail gas NOx after reason, and according to the emitted dose of the content of NOx control urea；
Wherein, the Second processing module, if knowing that the engine is in the second working region, basis specifically for searching
The aperture of the FAI Fresh Air Intake amount control EGR valve of intake flow sensor acquisition, to control new charge amount；Detection acquisition
Grain captures the content of treated nitrogen oxide in tail gas NOx, and the emitted dose of urea is controlled according to the content of NOx.
4. device according to claim 3, which is characterized in that the rotary speed information is acquired by the speed probe pre-seted
It obtains；The distributive value is acquired by fuel injector and is obtained.
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