CN110552794A - multi-stage injection method for diesel micro-injection ignition natural gas engine - Google Patents
multi-stage injection method for diesel micro-injection ignition natural gas engine Download PDFInfo
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- CN110552794A CN110552794A CN201910676990.3A CN201910676990A CN110552794A CN 110552794 A CN110552794 A CN 110552794A CN 201910676990 A CN201910676990 A CN 201910676990A CN 110552794 A CN110552794 A CN 110552794A
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- 238000002347 injection Methods 0.000 title claims abstract description 103
- 239000007924 injection Substances 0.000 title claims abstract description 103
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000003345 natural gas Substances 0.000 title claims abstract description 36
- 238000000520 microinjection Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005507 spraying Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 19
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- 239000003921 oil Substances 0.000 description 17
- 239000002283 diesel fuel Substances 0.000 description 14
- 229910002090 carbon oxide Inorganic materials 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 7
- 150000002430 hydrocarbons Chemical class 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/12—Arrangements for cooling other engine or machine parts
- F01P3/16—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0602—Control of components of the fuel supply system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
-
- 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
-
- 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
-
- 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
- F02D41/403—Multiple injections with pilot injections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P2003/005—Liquid cooling the liquid being fuel
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
a multi-stage injection method of a diesel micro-injection ignition natural gas engine is characterized in that when diesel micro-injection ignition natural gas is carried out, under the condition that the total injection diesel quantity is not changed, diesel is injected in two stages in the same piston working cycle, the injection time of the first stage is earlier than that of the second stage, and the diesel injection in the first stage is carried out in N times, wherein N is more than or equal to 1. The method reduces the heat load of the oil nozzle, improves the reliability of the oil injector and prolongs the service life of the oil injector.
Description
Technical Field
the invention belongs to the technical field of automobile engines, and particularly relates to a multi-stage injection method for a diesel micro-injection ignition natural gas engine, which is suitable for reducing the heat load of an oil nozzle.
background
In order to solve the problem, the pilot oil quantity needs to be greatly reduced, even a micro-injection ignition method is adopted, the ignition strength of gas mixture in a cylinder is reduced, the combustion in the cylinder is slowed down, and the emission of products is reduced.
chinese patent: the invention of application publication No. CN109209656A, application publication No. 2019, 01.15.A method for organizing combustion of a natural gas engine with multiple injection, low-pressure gas supply of a precombustion chamber and diesel oil micro-injection ignition is disclosed, in which a one-way gas supply valve injects natural gas into the precombustion chamber in an intake stroke, a high-pressure natural gas injection valve directly injects natural gas into the cylinder for multiple times, mixed gas stratification with different concentration gradients is formed in the cylinder under different engine loads, the precombustion chamber is positioned in the middle of a cylinder cover, an oil injector injects a small amount of diesel oil into the precombustion chamber near a compression top dead center, the diesel oil self-ignites and ignites the mixed gas in the precombustion chamber, and high-temperature fuel gas is sprayed from the precombustion chamber to ignite the mixed gas in the cylinder, so that the natural gas engine under different working conditions can reliably ignite, has high efficiency and low emission combustion, although the method, however, in the method, the micro-injection diesel oil has poor cooling effect on the oil nozzle, so that the heat load of the oil nozzle is higher, the reliability of the oil injector is reduced, and the service life of the oil injector is prolonged. Therefore, there is a problem that the thermal load of the oil jet is high.
Disclosure of Invention
The invention aims to solve the problem of high thermal load of an oil nozzle in the prior art, and provides an injection method of a diesel micro-injection ignition natural gas engine, which can reduce the thermal load of the oil nozzle.
in order to achieve the above purpose, the invention provides the following technical scheme:
a multi-stage injection method for a diesel micro-injection ignition natural gas engine comprises the following steps: when the diesel micro-injection is carried out to ignite the natural gas, under the condition that the total injection diesel quantity is not changed, the diesel is injected in two stages in the same piston working cycle, the injection time of the first stage is earlier than that of the second stage, and the diesel injection in the first stage is carried out for N times, wherein N is more than or equal to 1.
In the first stage, the time of the ith injection is any time from the movement of the piston to the position within 100-20 CA degrees before the top dead center, the time of the ith injection is earlier than the time of the (i + 1) th injection, wherein i is 1 and 2 … N, and the time of the second stage injection is any time from the movement of the piston to the position within 15-5 CA degrees before the top dead center.
In the first stage, the ith injection is performed at any time within a range of 100-60 CA before the piston moves to the top dead center.
the total diesel injection amount in the first stage is equal to the total diesel injection amount in the second stage, and the ith diesel injection amount in the first stage is equal to the (i + 1) th diesel injection amount.
compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a multi-stage injection method of a diesel micro-injection ignition natural gas engine, which is characterized in that when diesel micro-injection ignition natural gas is carried out, diesel is injected in two stages in the same piston working cycle under the condition that the total injection diesel quantity is not changed, the injection time of the first stage is earlier than that of the second stage, and the diesel injection in the first stage is carried out for N times, wherein N is more than or equal to 1, and the diesel is injected for multiple times to cool an oil nozzle, so that the heat load of the oil nozzle is reduced, the reliability of an oil injector is improved, and the service life of the oil injector is prolonged. Therefore, the invention reduces the heat load of the oil nozzle, improves the reliability of the oil injector and prolongs the service life of the oil injector.
2. according to the multi-stage injection method of the diesel micro-injection ignition natural gas engine, the ith injection time in the first stage is any time when the piston moves to 100-60 CA degrees before the top dead center, along with the advance of the ith injection time, the ignition strength of the gas mixture in the cylinder is reduced, the combustion rate is slowed down, and the highest combustion temperature in the cylinder is reduced, so that the emission of nitrogen oxides is reduced. Therefore, the invention reduces the emission of nitrogen oxides.
drawings
FIG. 1 is a schematic diagram of a multi-stage injection method of a diesel micro-injection pilot natural gas engine.
fig. 2 shows the nox emission for different engine loads as a function of the i-th injection time.
Fig. 3 shows the variation of the amount of hydrocarbons discharged with the i-th injection timing for different engine loads.
Fig. 4 shows the amount of carbon oxides emitted as a function of the i-th injection timing for different engine loads.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Referring to fig. 1, a multi-stage injection method of a diesel micro-injection ignition natural gas engine comprises the following steps: when the diesel micro-injection is carried out to ignite the natural gas, under the condition that the total injection diesel quantity is not changed, the diesel is injected in two stages in the same piston working cycle, the injection time of the first stage is earlier than that of the second stage, and the diesel injection in the first stage is carried out for N times, wherein N is more than or equal to 1.
In the first stage, the time of the ith injection is any time from the movement of the piston to the position within 100-20 CA degrees before the top dead center, the time of the ith injection is earlier than the time of the (i + 1) th injection, wherein i is 1 and 2 … N, and the time of the second stage injection is any time from the movement of the piston to the position within 15-5 CA degrees before the top dead center.
in the first stage, the ith injection is performed at any time within a range of 100-60 CA before the piston moves to the top dead center.
The total diesel injection amount in the first stage is equal to the total diesel injection amount in the second stage, and the ith diesel injection amount in the first stage is equal to the (i + 1) th diesel injection amount.
the principle of the invention is illustrated as follows:
The method mainly aims to directly increase the fuel injection quantity, strengthen the cooling effect on the fuel injector and reduce the heat load of the fuel injector at present, but the method sacrifices the advantages of flexible combustion in a micro-injection ignition mode and reduction of product emission, and brings adverse effects on the reliability and aftertreatment of an engine.
The invention discloses a multi-stage injection method of a diesel micro-injection ignition natural gas engine, which is an injection method for implementing early injection and multi-injection aiming at fuel oil.
Injection timing: the injection time is determined according to the working condition of the engine and is expressed by the crank angle of the engine.
Top dead center: the top dead center is the position of the piston when the piston moves to the maximum distance from the center of the crankshaft.
Example 1: a multi-stage injection method for a diesel micro-injection ignition natural gas engine is carried out according to the following steps: when diesel micro-injection is carried out to ignite natural gas, under the condition that the total injection diesel quantity is not changed, diesel is injected in two stages in the same piston working cycle, the injection time of the first stage is earlier than that of the second stage, and the diesel injection in the first stage is carried out for N times, wherein N is 1, the injection time of the first stage is 20 degrees CA before the piston moves to the top dead center, the injection time of the second stage is 10 degrees CA before the piston moves to the top dead center, the diesel quantities injected in the first stage and the second stage are both 5mg, the diesel injection pressures in the first stage and the second stage are both 110MPa, the natural gas injection pressure is 0.75MPa, and the engine load is 0.77 MPa.
example 2:
the same as in example 1, except that:
the moment of injecting diesel oil in the first stage is that the piston moves 30 degrees CA before the top dead center.
Example 3:
The same as in example 1, except that:
the moment of injecting diesel oil in the first stage is that the piston moves to 40 degrees CA before the top dead center.
Example 4:
The same as in example 1, except that:
The moment of injecting diesel oil in the first stage is 50 CA degrees after the piston moves to the top dead center.
Example 5:
the same as in example 1, except that:
the moment of injecting diesel oil in the first stage is 60 CA degrees after the piston moves to the top dead center.
Example 6:
The same as in example 1, except that:
The moment of injecting diesel oil in the first stage is 70 CA degrees after the piston moves to the top dead center.
example 7:
the same as in example 1, except that:
The moment of injecting diesel oil in the first stage is 80 CA degrees after the piston moves to the top dead center.
example 8:
the same as in example 1, except that:
the moment of injecting diesel oil in the first stage is 90 CA degrees after the piston moves to the top dead center.
example 9:
the same as in example 1, except that:
the moment of injecting diesel oil in the first stage is 100 CA degrees after the piston moves to the top dead center.
Example 10:
the same as in example 1, except that:
the engine load is 1.17 MPa.
Example 11:
The same as example 2, but different therefrom:
The engine load is 1.17 MPa.
example 12:
The same as example 3, except that:
The engine load is 1.17 MPa.
example 13:
The same as in example 4, except that:
the engine load is 1.17 MPa.
Example 14:
the same as example 5, except that:
The engine load is 1.17 MPa.
example 15:
The same as example 6, except that:
The engine load is 1.17 MPa.
Example 16:
The same as in example 7, except that:
the engine load is 1.17 MPa.
Example 17:
The same as in example 8, except that:
The engine load is 1.17 MPa.
example 18:
The same as in example 8, except that:
The engine load is 1.17 MPa.
example 19:
The same as in example 1, except that:
The engine load is 1.83 MPa.
example 20:
the same as example 2, but different therefrom:
the engine load is 1.83 MPa.
example 21:
the same as example 3, except that:
The engine load is 1.83 MPa.
Example 22:
the same as in example 4, except that:
The engine load is 1.83 MPa.
Example 23:
the same as example 5, except that:
the engine load is 1.83 MPa.
example 24:
The same as example 6, except that:
the engine load is 1.83 MPa.
example 25:
the same as in example 7, except that:
The engine load is 1.83 MPa.
example 26:
the same as in example 8, except that:
The engine load is 1.83 MPa.
example 27:
The same as in example 8, except that:
the engine load is 1.83 MPa.
example 28:
The same as in example 1, except that:
And the moment of injecting the diesel oil in the second stage is that the piston moves 15 degrees CA before the top dead center.
Example 29:
The same as in example 1, except that:
And the moment of injecting the diesel oil in the second stage is that the piston moves to 5 degrees CA before the top dead center.
Detection of emission of nitrogen oxides, hydrocarbons and oxides of carbon
The invention aims to detect the influence of the ith injection time on the discharge amount of nitrogen oxides, hydrocarbon and carbon oxides in the diesel micro-injection ignition natural gas engine in the first stage under different engine loads so as to carry out diesel single injectionComparative example 1, comparative example 2 and comparative example 3 of pilot natural gas by sub-micro-injection were compared with examples 1 to 9, examples 10 to 18 and examples 19 to 27, respectively, and the emissions of nitrogen oxides, hydrocarbons and carbon oxides in examples 1 to 27 and comparative examples 1 to 3 were measured, respectively, wherein the diesel injection timing in comparative example 1 was 10 CA before the piston moved to the top dead center, the total diesel injection amount was 10mg, the diesel injection pressure was 110MPa, the natural gas injection pressure was 0.75MPa, and the engine load was 0.77MPa (in the figure, the comparative example 1 was used as comparative example 1)expressed), the diesel injection timing in the comparative example 2 was 10 ° CA before top dead center, the total diesel injection amount was 10mg, the diesel injection pressure was 110MPa, the natural gas injection pressure was 0.75MPa, and the engine load was 1.17MPa (for the comparative example 2 in the figure)Expressed in terms of table), the diesel injection timing in the comparative example 3 is 10 ° CA before top dead center, the total diesel injection amount is 10mg, the diesel injection pressure is 110MPa, the natural gas injection pressure is 0.75MPa, and the engine load is 1.83MPa (the comparative example 3 is expressed as ■ in the figure), and the detection result of the nox emission amount is:
as can be seen from fig. 2, compared with comparative example 1, comparative example 2, and comparative example 3, the timings (main injection timings) of the second-stage injections in examples 1 to 9, examples 10 to 18, and examples 19 to 27 were fixed, the nox discharge amount was reduced when the timing of the first-stage injection (early injection timing) was within 60 ° CA before the piston moved to 100 ° CA before the piston moved to the top dead center, the reduction range of the nox discharge amount reached 33% in the case of the engine load of 0.77MPa (low load), 38% in the case of the engine load of 1.17MPa (medium load), and 7% in the case of the engine load of 1.83MPa (high load), therefore, the multi-stage injection method of the diesel micro-injection ignition natural gas engine reduces the discharge amount of nitrogen oxides under different engine loads;
the detection result of the discharge amount of the hydrocarbon is as follows:
As can be seen from fig. 3, compared with comparative example 1, comparative example 2 and comparative example 3, the time of the second stage injection in examples 1 to 9, examples 10 to 18 and examples 19 to 27 is fixed, and when the time of the first stage injection is within 20 ° CA before the piston moves to the top dead center and 100 ° CA before the piston moves to the top dead center, the discharge amount of hydrocarbons is reduced, so that the multi-stage injection method of the diesel micro-injection pilot natural gas engine reduces the discharge amount of hydrocarbons under different engine loads;
the detection result of the emission amount of the carbon oxides is as follows:
As can be seen from fig. 4, compared to comparative example 1, comparative example 2, and comparative example 3, the timings of the second-stage injections in examples 1 to 9, examples 10 to 18, and examples 19 to 27 are fixed, when the timing of the first-stage injection is within 20 ° CA before the piston moves to the top dead center to 100 ° CA before the piston moves to the top dead center, the emission amount of the carbon oxide is reduced at engine loads of 1.17MPa and 1.83MPa, and when the timing of the first-stage injection is within 30 ° CA before the piston moves to the top dead center to 60 ° CA before the piston moves to the top dead center, the emission amount of the carbon oxide is reduced at engine loads of 1.17MPa, and therefore, the multi-stage injection method of the diesel micro-injection pilot natural gas engine of the present invention reduces the emission amount of the carbon oxide at different engine loads.
Claims (4)
1. A multi-stage injection method for a diesel micro-injection ignition natural gas engine is characterized by comprising the following steps:
The spraying method comprises the following steps: when the diesel micro-injection is carried out to ignite the natural gas, under the condition that the total injection diesel quantity is not changed, the diesel is injected in two stages in the same piston working cycle, the injection time of the first stage is earlier than that of the second stage, and the diesel injection in the first stage is carried out for N times, wherein N is more than or equal to 1.
2. the multi-stage injection method of the diesel micro-injection pilot natural gas engine according to claim 1, characterized in that: in the first stage, the time of the ith injection is any time from the movement of the piston to the temperature within 100-20 ℃ A before the top dead center, the time of the ith injection is earlier than the time of the (i + 1) th injection, wherein i is 1 and 2 … N, and the time of the second stage injection is any time from the movement of the piston to the temperature within 15-5 ℃ A before the top dead center.
3. the multi-stage injection method of the diesel micro-injection pilot natural gas engine according to claim 2, characterized in that: in the first stage, the ith injection time is any time within 100-60 ℃ A before the piston moves to the top dead center.
4. A multi-stage injection method of a diesel micro-injection pilot natural gas engine according to any one of claims 1-3, characterized in that: the total diesel injection amount in the first stage is equal to the total diesel injection amount in the second stage, and the ith diesel injection amount in the first stage is equal to the (i + 1) th diesel injection amount.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110552795A (en) * | 2019-07-25 | 2019-12-10 | 东风商用车有限公司 | Injection method for diesel micro-injection ignition natural gas engine |
| CN116201650A (en) * | 2023-02-14 | 2023-06-02 | 潍柴动力股份有限公司 | Protection method and protection device for fuel injector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005120983A (en) * | 2003-10-20 | 2005-05-12 | Nissan Motor Co Ltd | Fuel injection control device for engine |
| CN107208561A (en) * | 2014-12-03 | 2017-09-26 | Sc-康塞普斯股份公司 | The injection controller and method of diesel motor fuel injection apparatus are controlled in the mixed running with diesel oil gaseous fuel mixture |
| CN109098865A (en) * | 2018-09-29 | 2018-12-28 | 哈尔滨工程大学 | A kind of uniform premixed natural gas-Diesel Dual-Fuel Engine method for controlling combustion based on reactivity control |
| CN109184929A (en) * | 2018-09-21 | 2019-01-11 | 陕西柴油机重工有限公司 | A kind of dual fuel engine ignition integrated system and its control method |
| CN110552795A (en) * | 2019-07-25 | 2019-12-10 | 东风商用车有限公司 | Injection method for diesel micro-injection ignition natural gas engine |
-
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- 2019-07-25 CN CN201910676990.3A patent/CN110552794A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005120983A (en) * | 2003-10-20 | 2005-05-12 | Nissan Motor Co Ltd | Fuel injection control device for engine |
| CN107208561A (en) * | 2014-12-03 | 2017-09-26 | Sc-康塞普斯股份公司 | The injection controller and method of diesel motor fuel injection apparatus are controlled in the mixed running with diesel oil gaseous fuel mixture |
| CN109184929A (en) * | 2018-09-21 | 2019-01-11 | 陕西柴油机重工有限公司 | A kind of dual fuel engine ignition integrated system and its control method |
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| CN110552795A (en) * | 2019-07-25 | 2019-12-10 | 东风商用车有限公司 | Injection method for diesel micro-injection ignition natural gas engine |
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