CN113756972A - Method for improving thermal efficiency of supercharged Miller cycle engine - Google Patents
Method for improving thermal efficiency of supercharged Miller cycle engine Download PDFInfo
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- CN113756972A CN113756972A CN202110834223.8A CN202110834223A CN113756972A CN 113756972 A CN113756972 A CN 113756972A CN 202110834223 A CN202110834223 A CN 202110834223A CN 113756972 A CN113756972 A CN 113756972A
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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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
- F02D19/0639—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
- F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
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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
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0689—Injectors for in-cylinder direct injection
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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
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0692—Arrangement of multiple injectors per combustion chamber
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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
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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
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
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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
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3076—Controlling fuel injection according to or using specific or several modes of combustion with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing
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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
- F02D41/403—Multiple injections with pilot injections
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
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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
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- 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
The invention relates to a method for improving the thermal efficiency of a supercharged Miller cycle engine, which is characterized in that two sets of oil injection systems are arranged in a cylinder, and a fuel oil injection system 7 is obliquely arranged in a combustion chamber 1 and is used for injecting gasoline for one time or multiple times, wherein the injection proportion of the gasoline can be changed according to the working condition during multiple times of injection; the ignition agent injection system 3 is arranged in the combustion chamber 1 in a top-mounted mode and used for injecting ether fuel to ignite lean gasoline mixture. By the method, the layered combustion of the mixed gas in the cylinder can be realized, the flame propagation speed is accelerated, the heat transfer loss is reduced, the fuel economy is improved, the CH emission is reduced, the low-temperature startability is enhanced, and the thermal efficiency of the Miller cycle engine under the low-load working condition is improved.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a method for improving the thermal efficiency of a supercharged Miller cycle engine.
Background
With the rapid development of economic technology, energy conservation and emission reduction are a great policy of the country, and automobile engineering advocates improvement of combustion modes and reduction of fuel consumption. The energy consumption rate is determined by the working efficiency of the automobile engine, and the mixing quality, fuel economy and dynamic property of fuel and air are determined by the fuel injection mode of the engine.
For a gasoline engine, the traditional air inlet injection has the characteristics of low combustion efficiency, poor economy and the like. The direct injection lean-burn method can enable the air-fuel ratio to be more than 40, which is beneficial to reducing the fuel consumption rate, but the concentration of the mixed gas is too low, which leads to the problem that the engine can not normally ignite and burn under the cold start and low load working condition. In addition, compared with an air inlet channel injection engine, research shows that the particle emission of the direct injection engine in the cylinder under the low working condition is obviously increased, and the emission of unburned hydrocarbon (UBHC) under the medium and small loads is increased, mainly because flame extinguishment occurs when flame is transmitted from an oil-gas rich region to a lean region, and the high air-fuel ratio causes the temperature in the cylinder to be lower, so that the continuous oxidation of the unburned hydrocarbon is not facilitated. In particular, for a miller cycle engine with a compression ratio of more than 14, ignition is more difficult, emission products are increased, and aftertreatment is more difficult after the in-cylinder direct injection technology is adopted.
Disclosure of Invention
The invention aims to provide a method for improving the thermal efficiency of a supercharged Miller cycle engine, which realizes the layered combustion of mixed gas in a cylinder, accelerates the flame propagation speed, reduces the heat transfer loss, improves the fuel economy, reduces the emission, enhances the low-temperature startability and improves the thermal efficiency of the Miller cycle engine under the low-load working condition.
In order to solve the problems, the invention provides a method for improving the thermal efficiency of a supercharged Miller cycle engine, wherein two sets of oil injection systems are arranged in a cylinder, the oil injection system 7 is obliquely arranged in a combustion chamber 1 and is used for injecting gasoline for one time or multiple times, and the injection proportion of the gasoline can be changed according to the working condition during multiple times of injection; the ignition agent injection system 3 is arranged in the combustion chamber 1 in a top-mounted mode and used for injecting ether fuel to ignite lean gasoline mixture.
Preferably, the oil injection system 7 is obliquely arranged in the combustion chamber 1, and has an included angle of less than or equal to 30 degrees with the central axis of the piston, so that fuel evaporation is facilitated, and a relatively thick fuel-air mixture is formed at the accessory of the oil injection system 3; the oil injection system 3 is arranged in the combustion chamber 1 in a top mode, so that flame can be uniformly spread, and the ignition area is increased.
Preferably, when the engine is in a cold start and a medium and low load working condition, the fuel injection system 7 injects gasoline into the combustion chamber for two times; under high load conditions, the fuel injection system 7 injects gasoline once in the combustion chamber.
Preferably, the two times of gasoline injection occur at different moments, the first time of gasoline injection occurs in the intake stroke of the piston, and the starting moment of the injection ranges from 180-240 CA BTDC; the second gasoline injection occurs in the compression stroke of the piston, and the injection starting time range is 60-120 CA BTDC.
Preferably, the oil injection proportion of the gasoline injected twice can be changed according to the working condition, the oil injection proportion is 1:4 under the low-temperature cold start working condition and the low-load working condition, and the rich mixed gas is formed at the accessory of the oil injection system 3 and is easy to ignite; under the medium-load working condition, the oil injection ratio is 2:3, the fuel oil atomization effect and the mixed gas layering effect are good, the combustion performance is improved, and the fuel oil utilization rate is improved.
Preferably, an ignition plug is eliminated, ether fuel (such as dimethoxymethane) is used as an ignition agent, the ignition plug has good combustion characteristics of low ignition point, high cetane number and the like, the quick ignition of the lean gasoline mixture in the cylinder of the supercharged Miller cycle engine with the compression ratio of more than 14 can be realized, and the emission performance is improved.
Preferably, the ignition agent oil injection system 3 adopts a cylinder internal direct injection multi-hole oil injector, the range of the injection starting time is 0-10 CA BTDC, and the ignition agent is sprayed out to form a plurality of flame jet flows in a combustion chamber.
Compared with the prior art, the technical scheme provided by the invention has the following advantages that:
two sets of oil injection systems are arranged in the cylinder, wherein the fuel oil injection systems are obliquely arranged in the combustion chamber, so that fuel oil atomization is facilitated; the ignition agent oil injection system is arranged in the center of the combustion chamber, so that flame can be uniformly spread, and the ignition area is increased; by changing the fuel injection frequency and the injection proportion, the stratified combustion of the mixed gas in the cylinder can be realized, the heat transfer loss is reduced, the fuel economy is improved, and the low-temperature startability is enhanced; gasoline is ignited by injecting ether fuel, so that ignition of lean gasoline mixture is facilitated, flame propagation speed is accelerated, heat transfer loss is reduced, CH emission is reduced, and thermal efficiency of the Miller cycle engine under a low-load working condition is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a gasoline direct injection engine according to an embodiment of the present invention;
reference numerals: 1-combustion chamber, 2-piston, 3-ignition agent injection system, 4-exhaust passage, 5-exhaust valve, 6-intake valve, 7-fuel injection system and 8-air inlet passage.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
In order to implement the method for improving the thermal efficiency of the supercharged Miller cycle engine, the direct injection gasoline engine in the cylinder is improved, the structure is schematically shown in figure 1, two sets of fuel injection systems are arranged in the cylinder, the fuel injection system 7 is obliquely arranged in the combustion chamber 1 and is used for injecting gasoline once or for multiple times, and the injection proportion of the gasoline during the multiple injection can be changed according to the working condition; the ignition agent injection system 3 is arranged in the combustion chamber 1 in a top-mounted mode and used for injecting ether fuel to ignite lean gasoline mixture.
In one embodiment, the oil injection system 7 is obliquely arranged in the combustion chamber 1, has an included angle of less than or equal to 30 degrees with the central axis of the piston, is favorable for fuel evaporation and forms a relatively thick fuel-air mixture near the oil injection system 3; the oil injection system 3 is arranged in the combustion chamber 1 in an overhead mode and is collinear with the central axis of the piston, so that flame can be uniformly spread, and the ignition area is increased.
In one embodiment, single or multiple injections of fuel are achieved by the ECU controlling the fuel injection signal. When the engine is in a cold start and medium and low load working condition, the fuel oil injection system 7 injects gasoline in the combustion chamber for two times so as to ensure reliable ignition; under a high-load working condition, the fuel oil injection system 7 injects gasoline in the combustion chamber for one time so as to enhance the fuel oil evaporation effect and improve the fuel oil utilization rate. The first gasoline injection is carried out in the intake stroke of the piston, and the injection starting time range is 180-240 CA BTDC; the second gasoline injection occurs in the compression stroke of the piston, and the injection starting time range is 60-120 CA BTDC.
In one embodiment, the variation of the fuel injection ratio is achieved by the ECU controlling the fuel injection pulsewidth. Under the working conditions of low-temperature cold start and low load, the oil injection ratio is 1:4, the concentration of the mixed gas formed at the accessory of the oil injection system 3 is higher, and the mixed gas is easy to ignite; under the medium-load working condition, the oil injection ratio is 2:3, the fuel oil atomization effect and the mixed gas layering effect are good, the combustion performance is improved, and the fuel oil utilization rate is improved.
In one embodiment, a spark plug is eliminated, and ether fuel (such as dimethoxymethane) is injected by an ignition agent injection system 3 to ignite the thin oil-gas mixture in the cylinder, and the injection starting time ranges from 0-10 CA BTDC. Because the ether fuel is inflammable and is sprayed out by the porous fuel injector, a plurality of flame jet flows can be formed in the cylinder, the ignition area is enlarged, the ignition energy is improved, the flame diffusion speed is accelerated, the ignition and the full combustion of the thin gasoline mixture under the full working condition are facilitated, the thermal efficiency of the engine is improved, and the emission is reduced.
In summary, according to the method for improving the thermal efficiency of the supercharged Miller cycle engine, gasoline is injected into the cylinder once or twice according to working conditions, the spark plug is cancelled, ether fuel with low self-ignition point is injected before the top dead center of compression, a plurality of flame jet flows are formed to ignite the thin oil-gas mixture in the cylinder, so that reliable ignition under each working condition is guaranteed, heat transfer loss is reduced, CH and PM emission is reduced, low-temperature startability is enhanced, and the thermal efficiency of the Miller cycle engine under the low-load working condition is improved.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (7)
1. A method for improving the thermal efficiency of a supercharged Miller cycle engine is characterized in that two sets of oil injection systems are arranged in a cylinder, the oil injection system 7 is obliquely arranged in a combustion chamber 1 and is used for injecting gasoline for one time or multiple times, and the injection proportion of the gasoline can be changed according to the working condition during multiple times of injection; the ignition agent injection system 3 is arranged in the combustion chamber 1 in a top-mounted mode and used for injecting ether fuel to ignite lean gasoline mixture.
2. The method for improving the thermal efficiency of a supercharged Miller-cycle engine according to claim 1, characterized in that the fuel injection system 7 is arranged obliquely in the combustion chamber 1, and has an angle of less than or equal to 30 ° with the central axis of the piston, so as to facilitate the evaporation of fuel and form a richer fuel-air mixture near the fuel injection system 3; the oil injection system 3 is arranged in the combustion chamber 1 in a top mode, so that flame can be uniformly spread, and the ignition area is increased.
3. A method of increasing the thermal efficiency of a supercharged miller-cycle engine as claimed in claim 1, characterized in that, during cold start and medium-low load conditions of said engine, the fuel injection system 7 injects the gasoline twice into the combustion chamber; under high load conditions, the fuel injection system 7 injects gasoline once in the combustion chamber.
4. The method of improving the thermal efficiency of a boosted miller cycle engine of claim 2, wherein the two injections of gasoline occur at different times, the first injection of gasoline occurs during the intake stroke of the piston, and the start of injection is in the range of 180 ° CA BTDC to 240 ° CA BTDC; the second gasoline injection occurs in the compression stroke of the piston, and the injection starting time range is 60-120 CA BTDC.
5. The method for improving the thermal efficiency of a supercharged Miller-cycle engine according to claim 2, characterized in that the injection proportion of the twice-injected gasoline can be changed according to the working condition, the injection proportion is 1:4 under the working condition of low-temperature cold start and the working condition of low load, and rich mixed gas is formed near the injection system 3 and is easy to ignite; under the medium-load working condition, the oil injection ratio is 2:3, the fuel oil atomization effect and the mixed gas layering effect are good, the combustion performance is improved, and the fuel oil utilization rate is improved.
6. The method for improving the thermal efficiency of the supercharged Miller cycle engine according to claim 1, characterized in that a spark plug is eliminated, ether fuel (such as dimethoxymethane) is used as an ignition agent, the ether fuel has good combustion characteristics of low ignition point, high cetane number and the like, and the quick ignition of the lean gasoline mixture in the supercharged Miller cycle engine cylinder with the compression ratio of more than 14 can be realized, so that the emission performance is improved.
7. The method for improving the thermal efficiency of the supercharged Miller cycle engine according to claim 1, characterized in that the ignition agent injection system 3 adopts an in-cylinder direct injection multi-hole injector, the injection starting time range is 0 ° CA BTDC-10 ° CA BTDC, and after the ignition agent is injected, a plurality of flame jets are formed in the combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110834223.8A CN113756972A (en) | 2021-07-23 | 2021-07-23 | Method for improving thermal efficiency of supercharged Miller cycle engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110834223.8A CN113756972A (en) | 2021-07-23 | 2021-07-23 | Method for improving thermal efficiency of supercharged Miller cycle engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116292015A (en) * | 2023-03-21 | 2023-06-23 | 吉林大学 | Compression ignition system with multi-point heating ring |
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2021
- 2021-07-23 CN CN202110834223.8A patent/CN113756972A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116292015A (en) * | 2023-03-21 | 2023-06-23 | 吉林大学 | Compression ignition system with multi-point heating ring |
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