CN112112729B - Variable air inlet tumble flow device of direct injection engine in dual-fuel cylinder - Google Patents

Variable air inlet tumble flow device of direct injection engine in dual-fuel cylinder Download PDF

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CN112112729B
CN112112729B CN202010886031.7A CN202010886031A CN112112729B CN 112112729 B CN112112729 B CN 112112729B CN 202010886031 A CN202010886031 A CN 202010886031A CN 112112729 B CN112112729 B CN 112112729B
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fuel
methanol
cylinder
dual
air inlet
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CN112112729A (en
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崔鹏
刘军恒
孙平
嵇乾
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Jiangsu University
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Jiangsu University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
    • F02B31/08—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets
    • F02B31/085—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets having two inlet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0223—Variable control of the intake valves only
    • F02D13/0226—Variable control of the intake valves only changing valve lift or valve lift and timing
    • 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
    • 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
    • F02D41/0002—Controlling intake air
    • 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
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention discloses a variable air intake tumble device of a direct injection engine in a dual-fuel cylinder, and relates to the technical field of dual-fuel engines. The variable air inlet tumble flow device of the dual-fuel oil sprayer can well control the characteristics of a methanol-air mixed airflow field in a cylinder, and enables a dual-fuel engine to efficiently and cleanly burn under various working conditions.

Description

Variable air inlet tumble flow device of direct injection engine in dual-fuel cylinder
Technical Field
The invention relates to the technical field of dual-fuel engines, in particular to a variable air inlet tumble device of a direct injection engine in a dual-fuel cylinder.
Background
The internal combustion engine promotes social and economic development in the development process, the main fuel of the traditional internal combustion engine for vehicles is gasoline and diesel oil, but the emission of the internal combustion engine for vehicles increases the environmental pollution and is also the main body of energy consumption. In order to achieve the purpose of energy conservation and emission reduction, the search for clean, economic and renewable alternative fuels becomes one of the main directions of research in the industry. The methanol has good economy, rich raw material sources and lower conventional emission, and plays an important role in conventional alternative fuels.
The method of using pure methanol to completely replace diesel fuel is difficult to implement, and thus, the concept of a dual fuel engine is proposed. At present, methanol is mostly injected by an air inlet channel of a dual-fuel engine, during the running process of the engine, methanol fuel with high octane number is injected into an air inlet pipeline of the engine, diesel fuel with high cetane number is directly injected into a cylinder through an original oil supply system, and after compression ignition of the diesel, methanol-air mixture is ignited.
However, the methanol sprayed by the air inlet channel is mainly promoted to evaporate by the aid of wall temperature and heat generated by backflow of exhaust gas when the inlet valve is opened, and the methanol is mixed with air to form combustible mixed gas. At the moment, incomplete fuel evaporation can occur, an oil film is easily formed on the wall surface of the air inlet channel, and the part of fuel cannot rapidly enter the cylinder and has a certain time delay, so that the instantaneous fuel combustion cannot be accurately controlled. Particularly, under variable working conditions and cold start working conditions, the injection amount of methanol needs to be increased, so that a large amount of methanol does not enter a cylinder in time and is incompletely combusted; meanwhile, due to the throttling effect of the inlet valve, the efficiency of the engine is greatly reduced, the consumption of fuel oil is increased, and the emission requirement of the engine cannot be guaranteed.
Disclosure of Invention
The invention aims to overcome the problems that the evaporation is slow, an oil film is easily formed on the wall surface of an air inlet channel and the efficiency is reduced due to the throttling action of an air inlet valve in the conventional method for injecting methanol into the air inlet channel, and provides a variable air inlet tumble device of a direct injection engine with double fuel cylinders, which can avoid the defect that the evaporation of the methanol injected into the air inlet channel is slow; on the basis of ensuring flexible oil supply of the dual-fuel engine, the dual-fuel engine can generate good adaptability with the air inlet tumble device; the lift of the intake valve can be adjusted according to the working condition of the engine, the airflow movement of mixed gas in the cylinder is better organized on the basis of ensuring the stable operation of the engine, and the optimal combustion efficiency and clean emission under each working condition are realized.
The present invention achieves the above-described object by the following technical means.
A variable air inlet tumble device of a direct injection engine in a dual-fuel cylinder comprises a dual-fuel oil supply system and a variable air inlet tumble device; the dual-fuel oil supply system controls the methanol fuel to be sprayed into the cylinder through the electronic control unit ECU to generate mixed gas and adopts direct-injection diesel oil to ignite, so that the dual-fuel oil supply of the engine is realized; the dual-fuel oil supply system comprises a methanol oil injector and a diesel oil injector, wherein the injection direction of the methanol oil injector faces to the exhaust side, and the diesel oil injector is positioned on the axis of a cylinder; the variable intake tumble device comprises an intake passage and an intake valve, wherein the intake passage can be divided into two parts by the intake valve, and when the lift of the intake valve is large, namely the intake valve is separated from a valve seat below, the intake airflow is not blocked; when the lift of the air inlet valve is small, namely the air inlet valve is partially attached to the lower valve seat, when air flows through the air inlet pipeline, one part of the air flows through the unobstructed channel of the air inlet valve, and the other part of the air flows is obstructed by the lower valve seat and the air inlet valve, so that the air flows are integrally formed into tumble.
Further, when the air inlet valve is provided with valve cone angles of 30 degrees and 90 degrees, points corresponding to the edge of the head of the air inlet valve are A and B, when the air inlet valve is installed, the projections of the point A and the point B on the horizontal plane are parallel to the center line of the horizontal section of the air cylinder, and the point A is positioned on one side close to the diesel oil injector.
Further, methanol fuel is sprayed into the cylinder by a methanol fuel injector in an air inlet stage to form methanol-air mixed gas; diesel fuel is injected into the cylinder by a diesel fuel injector before the compression top dead center, and the methanol-air mixture is ignited by compression ignition diesel.
Furthermore, the methanol fuel is filtered by the methanol filter, pumped into a methanol high-pressure alcohol rail by a methanol fuel pump and sprayed into the cylinder by a methanol fuel injector.
Furthermore, the horizontal plane projection of the methanol oil sprayer is positioned on the central line of the horizontal section of the cylinder, and the included angle between the methanol oil sprayer and the axis of the cylinder is 60 degrees.
Further, the diesel fuel is filtered by the diesel filter, pumped into a diesel high-pressure fuel rail by a diesel fuel pump and sprayed into the cylinder by a diesel fuel injector.
Furthermore, the oil injection time and the pulse width of the methanol oil injector and the diesel oil injector are controlled by an electronic control unit ECU.
Further, the gas flow area of the gas inlet pipeline is determined by the valve lift, and the valve lift is controlled by the electronic control unit ECU.
Further, the dual-fuel oil supply system also comprises a crank angle position sensor, an engine rotating speed sensor and an air intake flow sensor; the crank angle position sensor, the engine rotating speed sensor and the air inlet flow sensor transmit signals to an electronic control unit ECU, and the ECU integrates and analyzes the signals and outputs control instructions to a methanol oil sprayer and a diesel oil sprayer.
Further, after the methanol fuel is injected into the cylinder, the methanol fuel interacts with air on the air inlet side to form in-cylinder tumble flow.
The technical scheme of the invention has the beneficial effects and technical characteristics that:
1. the dual-fuel oil supply system can control the injection time and pulse width of methanol and diesel oil according to different working conditions of the engine, the variable air inlet tumble strength can be continuously changed, the control on air flow under different working conditions is timely changed, the formed tumble effect is optimal, the air flow movement in an engine cylinder is improved, the dual-fuel engine is ensured to work stably, the pollutant emission is effectively reduced, and therefore the dual-fuel engine can efficiently and cleanly burn, and the requirements of fuel economy and emission regulations are met.
2. The variable air inlet tumble device divides the air inlet passage by controlling the lift of the valve, and when air flows through the air inlet passage, one part of the air flows passes through the unobstructed passage of the valve, and the other part of the air flows is obstructed by the valve seat and the valve below, so that the air flows are integrally formed into tumble. Under the action of the valve transmission mechanism, the position state of the central line of the valve and the air inlet pipeline can not be changed, the valve is driven by the variable valve lift to reciprocate along a straight line, the sectional area of the blocking channel at the lower side of the air inlet channel can be adjusted in time, and the continuous variable of the air inlet tumble strength is realized.
3. In the air intake stage, the methanol injector sprays methanol into the cylinder at a specific angle, and the methanol injector cooperates with the in-cylinder tumble formed by air intake, so that the flow of mixed gas in the cylinder can be strengthened, and the quality of the mixed gas is improved.
4. According to the invention, the lift of the intake valve is controlled by the ECU to improve air intake and improve the tumble strength in the cylinder.
Drawings
Fig. 1 is a diagram of a dual fuel supply system according to an embodiment of the present invention;
FIG. 2 is a diagram of a fuel injector layout of the type referred to in FIG. 1 in accordance with the present invention;
FIG. 3 is a horizontal projection of the fuel injector arrangement of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic view of the intake valve configuration of FIG. 1 according to the present invention;
FIG. 5 is a structural view of the intake tumble apparatus according to the present invention shown in FIG. 1;
FIG. 6 is a schematic representation of the invention in relation to FIG. 1 for different positions of the intake valve.
Reference numerals:
1-a methanol tank; 2-methanol filter; 3-methanol fuel pump; 4-methanol high pressure alcohol rail; 5-methanol fuel injector; 6-diesel fuel tank; 7-a diesel filter; 8-a diesel fuel pump; 9-diesel high pressure fuel rail; 10-diesel fuel injector; 11-an air inlet channel; 12-an exhaust passage; 13-inlet valve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following first describes in detail embodiments according to the present invention with reference to the accompanying drawings
Referring to fig. 1, the dual-fuel supply system includes a methanol tank 1, a methanol filter 2, a methanol fuel pump 3, a methanol high-pressure alcohol rail 4, and a methanol injector 5 of the methanol supply system, and includes a diesel tank 6, a diesel filter 7, a diesel fuel pump 8, a diesel high-pressure oil rail 9, and a diesel injector 10 of the diesel supply system.
The methanol fuel supply is implemented by pumping methanol fuel oil in a methanol fuel tank 1 by a methanol fuel pump 3 through a methanol filter 2 into a methanol high-pressure alcohol rail 4, and then injecting the methanol fuel oil into a cylinder by a methanol fuel injector 5.
The diesel fuel supply is implemented by pumping the diesel fuel in the diesel fuel tank 6 into a diesel high-pressure fuel rail 9 through a diesel oil filter 7 by a diesel oil pump 8 and then spraying the diesel fuel into a cylinder by a diesel oil sprayer 10.
The dual-fuel mode crank angle position sensor, the engine rotating speed sensor, the intake flow sensor and the like which implement methanol premixed gas and diesel ignition transmit signals to the electronic control unit ECU, and the ECU integrates and analyzes various signals, calculates the quantity of fuel oil needing to be sprayed with methanol under the working condition and simultaneously outputs instructions to the methanol fuel injector 5 and the diesel fuel injector 10. At the initial stage of an air inlet stroke, the methanol injector 5 receives an instruction to inject methanol into the cylinder to form methanol-air mixed gas, when the piston is close to a top dead center, the diesel injector 10 receives an instruction to control diesel injection, and then the diesel is subjected to compression ignition in the cylinder and ignition of the methanol premixed gas is triggered at multiple points. Under a specific working condition, the engine cannot stably run in a dual-fuel mode, a single-fuel mode of diesel compression ignition is adopted, the ECU integrates signals of all sensors, the amount of diesel to be injected is calculated, an instruction is output to the diesel injector 10, and methanol injection is stopped at the same time, so that the stable running of the engine is ensured.
In the invention, in the air intake stage, the methanol injector receives an instruction to inject methanol into the cylinder, mixed gas is formed in the cylinder, when the piston is close to a top dead center, the diesel injector receives an instruction to control diesel injection, then the diesel is compression-ignited in the cylinder and ignition of methanol premixed gas is triggered at multiple points, namely a dual-fuel mode of ignition of the methanol premixed gas and the diesel is realized.
Referring to fig. 2 and 3, the projections of the methanol injector and the diesel injector on the horizontal plane are located on the center line of the section of the cylinder, and the diesel injector 10 is located on the axis of the cylinder.
The methanol injector 5 inclines towards the air inlet side and faces the air outlet side, the included angle alpha between the injector and the axis of the cylinder is 60 degrees, the methanol is ensured to be injected into the cylinder at a proper angle, the methanol jet flow and the tumble flow formed by air inlet interact, the mixing process of the methanol and the air is promoted, the gas flow in the cylinder can be well controlled, the contact between the methanol and the wall surface of the cylinder is avoided, and the mixing of the methanol and the air is completed while air inlet is performed.
Referring to fig. 4, the intake valve is mounted in such a manner that points a and B are set at the edge of the valve head at the valve taper angles of 30 ° and 90 °. When the air inlet valve is installed, the projection of the connecting line of the point A and the point B on the horizontal plane is parallel to the center line of the horizontal section of the cylinder, and the point A is arranged on one side close to the diesel injector, as shown in the attached drawing 3.
With the inventive inlet valve described in connection with fig. 5 and 6, when the valve is in position 1, the inlet valve 13 is closed and the valve blocks all the gas flow. When the intake valve 13 is between the positions 1 and 2, the intake valve 13 is in a half-open state, and the intake valve 13 blocks the lower part of the airflow, so that the in-cylinder tumble strength can be effectively enhanced in this state. When the inlet valve 13 is lower than the position 2, the inlet valve 13 is in a full-open state, airflow is not blocked when entering the cylinder, and because of different valve cone angles, the resistance of upper part airflow entering the cylinder is small, and the device can assist to cause the formation of in-cylinder tumble flow in the state.
Under the low-load working condition, the opening of the air valve is slightly larger than the position 1 during air inlet, the inlet air flow is concentrated on the top of the air inlet channel and flows into the air cylinder, the inlet air flow is drawn into the lower part of the air cylinder to form tumble flow, the air inlet amount flowing into the air cylinder under the working condition is small, the air flow circulation area is reduced to increase the air flow speed, and the tumble flow strength is highest under the state.
Under the working condition of medium and low load, the valve lift is greater than low load when air is fed, the valve opening is between positions 1 and 2, the airflow circulation area is increased when compared with the low load, the airflow flowing into the cylinder is higher than the low load, the lower part of the airflow is still blocked, the intensity of the tumble flow is lower than that of the tumble flow under the condition, but the air inlet flow and the tumble ratio are adaptive to the working condition of medium and low load, so that the combustion efficiency is optimized.
Under the working condition of medium and high load, the valve lift is larger than that of medium and low load during air intake, the valve opening is continuously increased to be close to the position 2, the airflow flow area is further increased, less airflow at the lower part is blocked, airflow flows into the cylinder from the top, the middle part and the middle and lower parts of the air inlet channel, the airflow is higher than that of the air inlet channel under the medium and low load, the intensity of the tumble flow is lower than that under the medium and low load in the state, but the airflow and the tumble ratio adapt to the working condition of medium and high load at the moment, and the combustion heat efficiency is optimized.
Under the high-load working condition, the air valve opening is larger than the position 2 during air inlet, the air inlet valve 13 is in a full-open state, airflow is not blocked when entering the air cylinder, the air inlet flow is maximum, correspondingly, the combustion injection quantity is also large, the valve cone angle has a certain guiding effect on the airflow, the tumble strength is relatively small at the moment, but the air inlet flow and the tumble ratio are matched with the high-load working condition, and the combustion heat efficiency is optimized.
The valve position is adjusted by the ECU according to the working condition of the dual-fuel engine.
In a dual-fuel mode, the device disclosed by the invention is combined with the nozzle arrangement, and under the action of improving a flow field, the best air flow guiding under each working condition can be realized to improve the methanol jet atomization effect, the optimization of the combination of the atomizing air flow can be realized, the methanol atomizing wall wetting condition is reduced, the quality of the mixed gas of methanol and air is improved, the methanol is fully combusted, and the dual-fuel energy utilization efficiency is higher.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims (9)

1. A variable air inlet tumble device of a direct injection engine in a dual-fuel cylinder is characterized by comprising a dual-fuel oil supply system and a variable air inlet tumble device; the dual-fuel oil supply system controls the methanol fuel to be sprayed into the cylinder through the electronic control unit ECU to generate mixed gas and adopts direct-injection diesel oil to ignite, so that the dual-fuel oil supply of the engine is realized; the dual-fuel oil supply system comprises a methanol oil injector (5) and a diesel oil injector (10), wherein the injection direction of the methanol oil injector (5) faces to the exhaust side, and the diesel oil injector (10) is positioned on the axis of a cylinder; the variable intake tumble device comprises an intake passage (11) and an intake valve (13), wherein the intake valve (13) can divide the intake passage (11) into two parts, and when the lift of the intake valve (13) is large, namely the intake valve (13) is separated from a lower valve seat, the intake airflow is not blocked; when the lift of the air inlet valve (13) is small, namely the air inlet valve (13) is partially attached to the lower valve seat, when the air flow passes through the air inlet channel (11), one part of the air flow passes through the non-blocking channel of the air inlet valve (13), and the other part of the air flow is blocked by the lower valve seat and the air inlet valve (13), so that the air flow is integrally formed into tumble flow; when the air inlet valve (13) is arranged at the air valve taper angles of 30 degrees and 90 degrees, points corresponding to the edge of the head of the air inlet valve (13) are A and B, when the air inlet valve (13) is installed, a connecting line of the projection of the point A and the point B on the horizontal plane is parallel to the center line of the horizontal section of the air cylinder, and the point A is positioned on one side close to the diesel oil injector (10).
2. The variable intake tumble device of a dual fuel in-cylinder direct injection engine according to claim 1 characterized in that methanol fuel is injected into the cylinder by a methanol injector (5) in the intake phase to form a methanol-air mixture; diesel fuel is injected into the cylinder by a diesel injector (10) before the compression top dead center, and the methanol-air mixture is ignited by compression ignition diesel.
3. The variable intake tumble flow device of the dual fuel in-cylinder direct injection engine according to claim 1 is characterized in that the methanol fuel is filtered by the methanol filter (2), pumped into the methanol high pressure alcohol rail (4) by the methanol fuel pump (3), and then injected into the cylinder by the methanol fuel injector (5).
4. The variable intake tumble device of the dual-fuel cylinder internal direct injection engine according to claim 1, characterized in that the horizontal plane projection of the methanol injector (5) is located on the center line of the horizontal section of the cylinder, and the included angle between the methanol injector (5) and the axis of the cylinder is 60 °.
5. The variable intake tumble flow device of a dual fuel in-cylinder direct injection engine according to claim 1 characterized in that the diesel fuel is filtered by a diesel filter (7), pumped by a diesel fuel pump (8) into a diesel high pressure rail (9) and injected into the cylinder by a diesel fuel injector (10).
6. The variable intake tumble device of a dual fuel in-cylinder direct injection engine according to claim 1 characterized in that the injection timing and pulse width of said methanol injector (5) and diesel injector (10) are controlled by an electronic control unit ECU.
7. The variable intake tumble device of a dual fuel cylinder direct injection engine according to claim 1 characterized in that the intake passage (11) gas flow area is determined by the valve lift, which is controlled by the electronic control unit ECU.
8. The variable intake tumble device of a dual fuel in-cylinder direct injection engine of claim 1 wherein said dual fuel supply system further comprises a crank angle position sensor, an engine speed sensor, and an intake air flow sensor; the crank angle position sensor, the engine rotating speed sensor and the air inlet flow sensor transmit signals to an Electronic Control Unit (ECU), and the ECU integrates and analyzes the signals and outputs control instructions to a methanol oil sprayer (5) and a diesel oil sprayer (10).
9. The variable intake tumble device of a dual fuel cylinder direct injection engine according to claim 1 characterized in that after methanol fuel is injected into the cylinder, it interacts with air on the intake side to form an in-cylinder tumble flow.
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