CN110552795A - Injection method for diesel micro-injection ignition natural gas engine - Google Patents

Injection method for diesel micro-injection ignition natural gas engine Download PDF

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Publication number
CN110552795A
CN110552795A CN201910677719.1A CN201910677719A CN110552795A CN 110552795 A CN110552795 A CN 110552795A CN 201910677719 A CN201910677719 A CN 201910677719A CN 110552795 A CN110552795 A CN 110552795A
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China
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injection
diesel
stage
time
natural gas
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Inventor
周杨
徐敏
胡晶晶
张娜
龚远飞
赵晨瑞
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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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
    • 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
    • F02D19/08—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 simultaneously using pluralities of fuels
    • F02D19/10—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 simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
    • 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
    • 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
    • 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

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  • 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)

Abstract

a method for injecting natural gas by diesel micro-injection includes such steps as injecting diesel oil in two stages in the same piston cycle under the condition of constant total diesel oil injection quantity, injecting diesel oil in the first stage earlier than in the second stage, and injecting diesel oil in the second stage N times, where N is greater 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

Injection method for diesel micro-injection ignition natural gas engine
Technical Field
The invention belongs to the technical field of automobile engines, and particularly relates to an injection method of a diesel micro-injection ignition natural gas engine, which is suitable for reducing the heat load of an oil nozzle, improving the reliability of an oil injector and prolonging the service life of the oil injector.
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:
an injection method for igniting a natural gas engine by diesel micro-injection 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 second stage is carried out in N times, wherein N is more than or equal to 1.
The time of the first stage injection is any time when the piston moves to be within 15-5 degrees CA before the top dead center, the time of the ith injection in the second stage is any time when the piston moves to be within 90 degrees CA after the top dead center, and the time of the ith injection is earlier than the time of the (i + 1) th injection, wherein i is 1 or 2 … N.
In the second stage, the time of the ith injection is any time from the time when the piston moves to 2 degrees CA before the top dead center to the time when the piston moves to 90 degrees CA after 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 second 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 an 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 second 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. in the injection method of the diesel micro-injection ignition natural gas engine, the ith injection time in the second stage is any time from the piston moving to 2 degrees CA before the top dead center to the piston moving to 90 degrees CA after the top dead center, along with the delay of the ith injection time, the ignition strength of the mixed gas 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 present invention reduces the emission of nitrogen oxides.
drawings
FIG. 1 is a schematic diagram of a diesel micro-injection ignition natural gas engine injection method.
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.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Referring to fig. 1, an injection method of a diesel micro-injection ignition natural gas engine is as follows: 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 second stage is carried out in N times, wherein N is more than or equal to 1.
The time of the first stage injection is any time when the piston moves to be within 15-5 degrees CA before the top dead center, the time of the ith injection in the second stage is any time when the piston moves to be within 90 degrees CA after the top dead center, and the time of the ith injection is earlier than the time of the (i + 1) th injection, wherein i is 1 or 2 … N.
In the second stage, the time of the ith injection is any time from the time when the piston moves to 2 degrees CA before the top dead center to the time when the piston moves to 90 degrees CA after 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 second 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 relates to an injection method of a diesel micro-injection ignition natural gas engine, which is an injection method for implementing late injection multiple 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:
An injection method for igniting a natural gas engine by diesel micro-injection, which comprises 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 second stage is carried out for N times, wherein N is 1, the injection time of the first stage is 10 degrees CA before the piston moves to the top dead center, the injection time of the second stage is 5 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 second stage injection time is 2 CA degrees before the piston moves to the top dead center.
example 3:
The same as in example 1, except that:
and the moment of the second-stage injection is that the piston moves to the top dead center.
Example 4:
the same as in example 1, except that:
And the second stage injection moment is 5 CA degrees after the piston moves to the top dead center.
example 5:
The same as in example 1, except that:
The second stage injection time is 10 degrees CA after the piston moves to the top dead center.
Example 6:
The same as in example 1, except that:
the second stage injection time is 15 degrees CA after the piston moves to the top dead center.
Example 7:
the same as in example 1, except that:
the second stage injection time is 20 CA degrees after the piston moves to the top dead center.
Example 8:
The same as in example 1, except that:
the second stage injection time is 90 CA degrees after the piston moves to the top dead center.
Example 9:
the same as in example 1, except that:
The engine load is 1.17 MPa.
example 10:
The same as example 2, but different therefrom:
the engine load is 1.17 MPa.
example 11:
The same as example 3, except that:
the engine load is 1.17 MPa.
example 12:
the same as in example 4, except that:
The engine load is 1.17 MPa.
example 13:
The same as example 5, except that:
The engine load is 1.17 MPa.
Example 14:
The same as example 6, except that:
The engine load is 1.17 MPa.
Example 15:
The same as in example 7, except that:
The engine load is 1.17 MPa.
example 16:
The same as in example 8, except that:
the engine load is 1.17 MPa.
Example 17:
the same as in example 1, except that:
the engine load is 1.83 MPa.
example 18:
The same as example 2, but different therefrom:
the engine load is 1.83 MPa.
example 19:
The same as example 3, except that:
The engine load is 1.83 MPa.
example 20:
the same as in example 4, except that:
The engine load is 1.83 MPa.
example 21:
the same as example 5, except that:
the engine load is 1.83 MPa.
Example 22:
The same as example 6, except that:
The engine load is 1.83 MPa.
Example 23:
The same as in example 7, except that:
the engine load is 1.83 MPa.
Example 24:
The same as in example 8, except that:
The engine load is 1.83 MPa.
example 25:
The same as in example 4, except that:
the first stage injection is carried out at the time when the piston moves 15 degrees CA before the top dead center.
Example 26:
The same as example 5, except that:
the first stage injection is carried out at the time when the piston moves 5 degrees CA before the top dead center.
detection of discharge of nitrogen oxide and hydrocarbon
in order to detect the influence of the ith injection time on the discharge amount of nitrogen oxides and hydrocarbons in the diesel micro-injection pilot natural gas engine in the second stage under different engine loads, the invention compares the comparative examples 1, 2 and 3 of the diesel single micro-injection pilot natural gas with the examples 1-8, 9-16 and 17-24 respectively, and detects the discharge amount of the nitrogen oxides and the hydrocarbons in the examples 1-24 and 1-3 respectively, wherein the diesel injection time in the comparative example 1 is 10 CA degrees before the piston moves to the top dead center, the total injection amount of the diesel is 10mg, the injection pressure of the diesel is 110MPa, the injection pressure of the natural gas is 0.75MPa and the engine load is 0.77MPa (the comparative example 1 is expressed by the lambda-phi in the figure), the diesel injection time in the comparative example 2 is 10 CA degrees before the top dead center, the total injection amount of the diesel is 10mg, The diesel injection pressure is 110MPa, the natural gas injection pressure is 0.75MPa, the engine load is 1.17MPa (comparative example 2 is ● in the figure), the diesel injection time 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 (comparative example 3 is ■ in the figure), and the detection result of the emission amount of nitrogen oxides is as follows:
as can be seen from fig. 2, the first-stage injection timings (main injection timings) in examples 1 to 8, examples 9 to 16, and examples 17 to 24 are fixed as compared with comparative example 1, comparative example 2, and comparative example 3, when the second-stage injection timing (late injection timing) is within 2 CA before the piston moves to top dead center to 90 CA after the piston moves to top dead center, the discharge amount of the nitrogen oxides is reduced, when the second stage diesel oil injection time is 10 CA degrees after the piston moves to the top dead center, when the engine load is 0.77MPa (low load) and 1.83MPa (high load), the reduction range of the emission amount of the nitrogen oxides reaches 30 percent, the reduction range of the emission amount of the nitrogen oxides reaches 42 percent under the condition that the engine load is 1.17MPa (medium load), therefore, the 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, in examples 1 to 8, examples 9 to 16 and examples 17 to 24, the first-stage injection timing is fixed, when the second-stage injection timing is within the range from 5 ° CA before the piston moves to the top dead center to 90 ° CA after the piston moves to the top dead center, the emission amount of hydrocarbons is increased, and the emission condition is deteriorated, when the second-stage injection timing is 10 ° CA after the piston moves to the top dead center, the increase range of the emission amount of hydrocarbons reaches 7% under the engine loads of 0.77MPa and 1.83MPa, and the increase range of the emission amount of hydrocarbons reaches 31% under the engine load of 1.17MPa, although the emission of hydrocarbons is deteriorated, the deterioration degree is small, and the influence of deterioration can be eliminated by other technical means.

Claims (4)

1. a diesel micro-injection ignition natural gas engine injection method is characterized in that:
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 second stage is carried out in N times, wherein N is more than or equal to 1.
2. the injection method of the diesel micro-injection pilot natural gas engine according to claim 1, characterized in that: the time of the first stage injection is any time when the piston moves to be within 15-5 degrees CA before the top dead center, the time of the ith injection in the second stage is any time when the piston moves to be within 90 degrees CA after the top dead center, and the time of the ith injection is earlier than the time of the (i + 1) th injection, wherein i is 1 or 2 … N.
3. the injection method of a diesel micro-injection pilot natural gas engine according to claim 2, characterized in that: in the second stage, the time of the ith injection is any time from the time when the piston moves to 2 degrees CA before the top dead center to the time when the piston moves to 90 degrees CA after the top dead center.
4. An 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 second stage is equal to the (i + 1) th diesel injection amount.
CN201910677719.1A 2019-07-25 2019-07-25 Injection method for diesel micro-injection ignition natural gas engine Pending CN110552795A (en)

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CN110552794A (en) * 2019-07-25 2019-12-10 东风商用车有限公司 multi-stage injection method for diesel micro-injection ignition natural gas engine
EP4151848A1 (en) * 2021-09-21 2023-03-22 Yanmar Holdings Co., Ltd. Engine system and gas fuel combustion method

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