CN109404153A - The method for reducing NOx emission under the low row's temperature of diesel engine - Google Patents
The method for reducing NOx emission under the low row's temperature of diesel engine Download PDFInfo
- Publication number
- CN109404153A CN109404153A CN201910001481.0A CN201910001481A CN109404153A CN 109404153 A CN109404153 A CN 109404153A CN 201910001481 A CN201910001481 A CN 201910001481A CN 109404153 A CN109404153 A CN 109404153A
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- China
- Prior art keywords
- temperature
- row
- low row
- nox emission
- diesel engine
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
-
- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses the methods of NOx emission under a kind of low row's temperature of reduction diesel engine.The method of NOx emission increases function identical low row's temperature mode on the basis of original engine operation mode of automatically controlled policy system under the low row's temperature of the reduction diesel engine, and it is sprayed after being further added by after the main jet in low row's temperature mode, main jet timing is reduced by the composite calibration of air throttle, rear distributive value, rear spray angular interval, achievees the purpose that reduce NOx emission under low row's temperature.The method of NOx emission can the row of raising be warm by a relatively large margin rapidly under the low row's temperature of the reduction diesel engine, so that closed throttle amplitude is smaller under low row's temperature, reduces oil mixed hidden danger, reduces the risk of booster failure and burn oil.
Description
Technical field
The present invention relates to engine arts, especially with regard to the method for NOx emission under a kind of low row's temperature of reduction diesel engine.
Background technique
Vehicle device state six and non-rice habitats T4 regulation all clear stipulaties engine pollutant under rack cold and hot test loop
NOx emission will be met the requirements.In cold conditions test loop first half, since engine is not through overheated machine, operating load is smaller,
Acutely, this stage row's temperature is very low for operating condition variation, leads to very low (the row Wen Zhi of SCR in catalyst converter (selective catalytic reduction) efficiency
The height for influencing SCR efficiency is connect, SCR efficiency height, which then converts, falls that NOx in tail gas is more, and the NOx emitted just tails off), NOx emission
It is higher.
Meanwhile regulation also requires vehicle NOx emission.During vehicle emission test, environment temperature is low, vehicle
Load it is small, especially under city operating condition service condition, engine row temperature it is very low, the discharge of NOx also can be higher at this time.
The common way of NOx is reduced under current low row's temperature: 1, reducing NOx raw emissions.By postponing main jet timing, delay
Ignition timing and then reduction ignition temperature inhibition NOx generation.2, row's temperature is improved by air throttle.Turn down air throttle on air inlet tube
Aperture, reduces the new charge amount in cylinder that enters, and air-fuel ratio descent tape comes efficiency of combustion decline, row's temperature rise, catalyst converter conversion effect
Rate improves, to reduce NOx emission.
The shortcomings that NOx practices well is reduced under existing low row's temperature:
1, NOx raw emissions are reduced by postponing main jet timing, since burning is deteriorated, the oil consumption of engine be will increase, PM
Increase.When engine row's temperature is high, SCR conversion efficiency is also relatively high, the automatically controlled data for reducing main jet timing are still run, this
Sample will cause oil consumption increase, while also resulting in PM and increasing even beyond limit value.
2, the disadvantage for arranging temperature is improved by air throttle: air inflow (1) being reduced by air throttle, deterioration burning is warm come the row of raising,
Engine consumption will increase.When engine row temperature very it is high do not needed temperature raising again when, but still run the electricity for closing air throttle
Data are controlled, unnecessary oil consumption is will result in this way and increases, while also resulting in PM increase；(2) in order to which the row of raising as far as possible is warm,
Need closed throttle amplitude is very big, biggish negative pressure generated after this subject throttle, it is easy to oil mixed occurs, booster therefore
The risk of barrier and burn oil is all larger.(3) row's temperature is only improved by air throttle, temperature rise speed is slower under some conditions, amplitude
It is unobvious.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for reducing NOx emission under the low row's temperature of diesel engine of advantages of simple, should
The method of NOx emission can the row of raising be warm by a relatively large margin rapidly under the low row's temperature of reduction diesel engine, so that the air throttle under low row's temperature
Closing amplitude is smaller, reduces oil mixed hidden danger, reduces the risk of booster failure and burn oil.
To achieve the above object, the present invention provides the methods of NOx emission under a kind of low row's temperature of reduction diesel engine, automatically controlled
Increase the identical low row's temperature mode of function on the basis of original engine operation mode of policy system, and in low row's temperature mode
In main jet after be further added by after spray, main jet is being reduced just by the composite calibration of air throttle, rear distributive value, rear spray angular interval
When, achieve the purpose that reduce NOx emission under low row's temperature.
In a preferred embodiment, the nominal data of original operational mode remains unchanged.
In a preferred embodiment, delivery temperature switching is added between original operational mode and low row's temperature mode to open
It closes.
Compared with prior art, the method according to the present invention for reducing NOx emission under the low row's temperature of diesel engine has and has as follows
Beneficial effect:
1, structure is simple, is increased without new parts.
2, the normal operation of vehicle or engine is not interfered with.
3, reduce NOx emission in low row Wen Shineng, at the same in not influencing high row's temperature oil consumption and PM discharge.
4, after spraying after increasing, the warm speed of the row of raising is fast, and amplitude is big.
5, closed throttle amplitude is smaller under low row's temperature, reduces oil mixed hidden danger, reduces booster failure and burn oil
Risk.
Detailed description of the invention
Fig. 1 is the structural representation for reducing the method for NOx emission under the low row's temperature of diesel engine according to an embodiment of the present invention
Figure.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As shown in Figure 1, the method cost for reducing NOx emission under the low row's temperature of diesel engine of specific embodiment according to the present invention
It is lower；The normal operation of engine is not influenced；Meeting in low row's temperature reduces NOx emission demand；It does not influence under non-low row's temperature
Oil consumption and PM；Closed throttle amplitude is smaller under low row's temperature, reduces oil mixed risk；The warm speed of the row of raising is fast, and amplitude is big.It should
The method for reducing NOx emission under the low row's temperature of diesel engine are as follows:
1, it keeps the nominal data of original operational mode of engine 1 constant, that is, does not reduce engine NOx under low temperature
Raw emissions, also the row of raising is not warm.It is laid with air throttle 3 in the air inlet pipe 2 of engine 1, catalyst converter 5 is laid on exhaust pipe 4.
2, inside automatically controlled policy system, on the basis of original engine operation mode, it is further added by a low row Wen Mo
Formula, as original operational mode, engine can also operate normally the function that low row's temperature mode has in low row's temperature mode.
3, it by reducing the main jet timing inside low row's temperature mode, is arranged to achieve the purpose that reduce NOx source under low row's temperature.
4, it in low row's temperature mode, after main jet, is further added by a fuel oil injection and namely sprays afterwards.By air throttle,
The composite calibration of distributive value, rear spray angular interval afterwards, the amplitude of air throttle closed loop is smaller, can the row of raising is warm by a relatively large margin rapidly.
5, it is running between original operational mode and low row's temperature mode, is increasing delivery temperature switching switch.The lower need of row's temperature
When reducing NOx emission, engine enters low row's temperature mode operation, and when row's temperature rise is to when switching switch value, engine is transported
The original operational mode of row.Increase low row's temperature mode identical with former operational mode function.In low row's temperature mode, main jet knot
Shu Hou is further added by the injection of fuel oil and namely sprays afterwards, can the row of raising is warm by a relatively large margin rapidly.Original operation mould is run in original
Between formula and the low row's temperature mode newly increased, increase delivery temperature switching switch, can as needed engine in two modes
Between toggle.
To sum up, the method increase by one of NOx emission is identical with original operational mode function under the low row's temperature of the reduction diesel engine
Low row's temperature mode, and be further added by after main jet a fuel oil injection and namely spray afterwards, being capable of the row of raising by a relatively large margin rapidly
Temperature reduces oil mixed hidden danger so that closed throttle amplitude is smaller under low row's temperature, reduces the wind of booster failure and burn oil
Danger.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (3)
1. a kind of method for reducing NOx emission under the low row's temperature of diesel engine, which is characterized in that original in automatically controlled policy system starts
Increase the identical low row's temperature mode of function on the basis of machine operational mode, and increases again after main jet in low row's temperature mode
It is sprayed after adding, main jet timing is reduced by the composite calibration of air throttle, rear distributive value, rear spray angular interval, reaches and reduces low row's temperature
The purpose of lower NOx emission.
2. reducing the method for NOx emission under the low row's temperature of diesel engine as described in claim 1, which is characterized in that original fortune
The nominal data of row mode remains unchanged.
3. reducing the method for NOx emission under the low row's temperature of diesel engine as described in claim 1, which is characterized in that original fortune
Delivery temperature switching switch is added between row mode and low row's temperature mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910001481.0A CN109404153A (en) | 2019-01-02 | 2019-01-02 | The method for reducing NOx emission under the low row's temperature of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910001481.0A CN109404153A (en) | 2019-01-02 | 2019-01-02 | The method for reducing NOx emission under the low row's temperature of diesel engine |
Publications (1)
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| CN109404153A true CN109404153A (en) | 2019-03-01 |
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| CN201910001481.0A Pending CN109404153A (en) | 2019-01-02 | 2019-01-02 | The method for reducing NOx emission under the low row's temperature of diesel engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720228A (en) * | 2020-06-30 | 2020-09-29 | 广西玉柴机器股份有限公司 | Exhaust temperature monitoring and correcting method and system for cylinders of engine |
| CN112814768A (en) * | 2020-12-31 | 2021-05-18 | 潍柴动力股份有限公司 | SCR (selective catalytic reduction) thermal management method and system |
| CN112983661A (en) * | 2021-01-29 | 2021-06-18 | 广西玉柴机器股份有限公司 | Engine plateau high-cold thermal management control device and method |
| CN113309623A (en) * | 2020-02-26 | 2021-08-27 | 上海汽车集团股份有限公司 | Method and device for improving SCR (Selective catalytic reduction) aftertreatment exhaust temperature and electronic control unit |
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| JP2002285824A (en) * | 2001-03-26 | 2002-10-03 | Isuzu Motors Ltd | Exhaust temperature rise control method for engine and regeneration control method for exhaust emission control system |
| JP2006029301A (en) * | 2004-07-21 | 2006-02-02 | Toyota Motor Corp | Exhaust emission control device for compression ignition internal combustion engine and exhaust emission control method for compression ignition internal combustion engine |
| JP2010151058A (en) * | 2008-12-25 | 2010-07-08 | Mitsubishi Heavy Ind Ltd | Exhaust emission control device for diesel engine |
| JP2017115632A (en) * | 2015-12-22 | 2017-06-29 | 三菱自動車工業株式会社 | Fuel injection control device for internal combustion engine |
| CN107762653A (en) * | 2017-10-10 | 2018-03-06 | 中国第汽车股份有限公司 | Diesel oxidation catalyst temperature control system |
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2019
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002285824A (en) * | 2001-03-26 | 2002-10-03 | Isuzu Motors Ltd | Exhaust temperature rise control method for engine and regeneration control method for exhaust emission control system |
| JP2006029301A (en) * | 2004-07-21 | 2006-02-02 | Toyota Motor Corp | Exhaust emission control device for compression ignition internal combustion engine and exhaust emission control method for compression ignition internal combustion engine |
| JP2010151058A (en) * | 2008-12-25 | 2010-07-08 | Mitsubishi Heavy Ind Ltd | Exhaust emission control device for diesel engine |
| JP2017115632A (en) * | 2015-12-22 | 2017-06-29 | 三菱自動車工業株式会社 | Fuel injection control device for internal combustion engine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309623A (en) * | 2020-02-26 | 2021-08-27 | 上海汽车集团股份有限公司 | Method and device for improving SCR (Selective catalytic reduction) aftertreatment exhaust temperature and electronic control unit |
| CN111720228A (en) * | 2020-06-30 | 2020-09-29 | 广西玉柴机器股份有限公司 | Exhaust temperature monitoring and correcting method and system for cylinders of engine |
| CN112814768A (en) * | 2020-12-31 | 2021-05-18 | 潍柴动力股份有限公司 | SCR (selective catalytic reduction) thermal management method and system |
| CN112814768B (en) * | 2020-12-31 | 2022-04-05 | 潍柴动力股份有限公司 | SCR (selective catalytic reduction) thermal management method and system |
| CN112983661A (en) * | 2021-01-29 | 2021-06-18 | 广西玉柴机器股份有限公司 | Engine plateau high-cold thermal management control device and method |
| CN112983661B (en) * | 2021-01-29 | 2022-12-16 | 广西玉柴机器股份有限公司 | Engine plateau high-cold thermal management control device and method |
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Application publication date: 20190301 |