CN115370465A - Gasoline engine jet flow precombustion chamber sharing oil injection ignition, control method and system and engine - Google Patents
Gasoline engine jet flow precombustion chamber sharing oil injection ignition, control method and system and engine Download PDFInfo
- Publication number
- CN115370465A CN115370465A CN202211084490.9A CN202211084490A CN115370465A CN 115370465 A CN115370465 A CN 115370465A CN 202211084490 A CN202211084490 A CN 202211084490A CN 115370465 A CN115370465 A CN 115370465A
- Authority
- CN
- China
- Prior art keywords
- fuel
- oil
- ignition
- jet
- combustion chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
- F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber
- F02B19/108—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
- F02B19/1085—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber controlling fuel injection
-
- 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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/12—Engines characterised by precombustion chambers with positive ignition
-
- 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
- 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
- F02D41/401—Controlling injection timing
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention provides a gasoline engine jet flow precombustion chamber sharing oil injection ignition, a control system and a control method thereof and a jet flow ignition gasoline engine, wherein the precombustion chamber comprises: a main shell, a cavity sleeve body, an oil injector, a jet hole and a spark plug. The cavity sleeve body is arranged below the main shell body, and the cavity sleeve body and the main shell body are integrated up and down to form a precombustion chamber cavity. In the invention, the N-hole electromagnetic oil injector (N is more than or equal to 4) in the precombustion chamber or the outward-opening oil injector is arranged in the precombustion chamber, when the precombustion chamber is arranged at the top of the ignition type piston engine for injection, fuel oil spray can uniformly reach the surface of the inner wall of the cylindrical cavity sleeve body, and because of the relative position relationship between N spray holes (N is more than or equal to 4) on the side surface of the cylindrical cavity sleeve body and the corresponding oil injectors, the spray can be injected into the external main combustion chamber through the N spray holes in an unblocked manner, directly or indirectly through a flow guide structure, so that the fuel spray can be injected into the pre-combustion chamber and the main combustion chamber by only using a fuel injector arranged in the middle of one pre-combustion chamber, and the whole processes of fuel injection diffusion and ignition combustion are completed.
Description
Technical Field
The invention relates to the technical field of combustion of internal combustion engines, in particular to a jet flow precombustion chamber of a gasoline engine sharing oil injection ignition, a control method, a control system and an engine.
Background
Jet ignition in precombustion chambers is a promising technology for improving the combustion performance of engines. Compared with the traditional engine spark ignition system, the jet ignition system of the precombustion chamber has an additional small precombustion chamber at the top of the combustion chamber, and the working principle is as follows: the traditional spark plug in the precombustion chamber discharges to ignite the combustible mixed gas in the precombustion chamber, the temperature and the pressure in the precombustion chamber are increased, and flame is injected into the main combustion chamber from a plurality of spray holes which are connected with the main combustion chamber at the lower end of the precombustion chamber to form jet flame. At the moment, the pre-combustion chamber is equivalent to an ignition source of the main combustion chamber, and further combustible mixed gas in the main combustion chamber is ignited. The high-speed flame jet flow generated by the combustion of the precombustion chamber can generate larger turbulence disturbance in the cylinder, meanwhile, a plurality of flame surfaces are more fully contacted with the combustible mixed gas in the main combustion chamber, and higher ignition energy and larger ignition area are favorable for the combustion of fuel in the main combustion chamber.
There are two types of structures, active and passive, for prechamber jet ignition.
The passive pre-combustion chamber is internally provided with only one traditional spark plug which is arranged in the middle, and combustible mixed gas with certain concentration is formed in a cylinder after oil is injected by an oil injector outside the pre-combustion chamber or in an air passage, and then the mixed gas is compressed into the pre-combustion chamber through in-cylinder flow and piston compression. The passive precombustion chamber has the defects that the mixed gas comes from the external pressing and is unevenly distributed in the precombustion chamber, the stable ignition under the dilution condition cannot be realized, and the combustion-supporting effect of the precombustion chamber is reduced.
Besides the spark plug, the inside of the active pre-combustion chamber is also provided with a single pre-combustion chamber fuel injector, so that the fuel injection quantity in the pre-combustion chamber can be automatically controlled, and the concentration of combustible mixture in the pre-combustion chamber can be stably adjusted. However, due to the volume limitations of the prechamber itself and the need for placement of the injector and spark plug within the prechamber, the injector must be offset. Active prechambers have the disadvantage that the fuel is very likely to hit the inner wall of the prechamber during injection, causes the concentration distribution of the mixed gas in the precombustion chamber to be uneven, further influencing the combustion effect of fuel in the precombustion chamber, and finally influencing the uniformity and stability of jet flame in the precombustion chamber. In addition, the active prechamber has a separate fuel injector inside the prechamber, and another fuel injector outside the prechamber must be provided to form a combustible mixture of a certain concentration in the main combustion chamber. The two cooperate with each other, the mixed gas in the main combustion chamber is ignited by the combustion in the precombustion chamber, the additional fuel injectors required make this system more complex, increasing manufacturing and maintenance costs.
Therefore, a technical solution for optimizing the whole processes of fuel injection diffusion and ignition combustion in the pre-combustion chamber and the main combustion chamber is needed in the prior art.
Disclosure of Invention
In view of the above problems, the present invention provides the following technical solutions.
A jet prechamber for a gasoline engine sharing fuel injection ignition, comprising:
a main housing;
a cavity sleeve body arranged below the main shell body and provided with a plurality of grooves, the cavity formed by enclosing the lower end surface of the main shell and the cavity sleeve body forms a precombustion chamber cavity; the cavity sleeve body is provided with a jet flow orifice and a ventilation hole;
an oil injector; the lower end of the fuel injector passes through the main shell from the upper center of the main shell and extends into the cavity of the pre-combustion chamber, and the lower end of the fuel injector is provided with an injector nozzle;
a spark plug is provided with a spark plug body, the lower end of the spark plug obliquely penetrates through the main shell from the upper part of the main shell and extends into the prechamber cavity;
and the spark plug electrode is arranged at the lower end of the spark plug.
The jet flow spray hole is formed in the side face of the bottom structure of the cavity sleeve body, and the vent hole is formed in the bottom of the bottom structure of the cavity sleeve body.
The oil sprayer is an outward-opening oil sprayer, and a central axis between the conical spraying outer edge and the conical spraying inner edge of the outward-opening oil sprayer coincides with the axis of the jet flow spray hole.
The number of the jet flow spray holes is N, the jet flow spray holes are uniformly distributed on the circumference of the side surface of the bottom structure of the cavity sleeve body, the central axis between the outer edge and the inner edge of the conical spray of the outward-opening oil sprayer is coincided with the axes of the N jet flow spray holes, and the aperture of each jet flow spray hole is between the maximum width and the minimum width of the conical spray; wherein N is more than or equal to 4. The proportion of the radial width of the jet orifice to the perimeter of the cavity sleeve body is used for controlling the proportion of the conical spray remaining in/out of the precombustion chamber.
The fuel injector is an electromagnetic fuel injector, and the axis of a fuel injection hole on the electromagnetic fuel injector is superposed with the axis of the jet injection hole. The ratio of the projection area of the spray sprayed by the fuel spray hole in the cavity sleeve body to the area of the jet spray hole is used for controlling the fuel ratio of the pre-combustion chamber and the main combustion chamber, and the fuel spray can be adjusted through the spray pressure, so that the fuel ratio of the pre-combustion chamber and the main combustion chamber is regulated.
The number of the jet flow spray holes is N, the jet flow spray holes are uniformly distributed on the circumference of the side surface of the bottom structure of the cavity sleeve body, the electromagnetic type oil sprayer is provided with N fuel oil spray holes (10), and the axial lines of the N fuel oil spray holes (10) of the electromagnetic type oil sprayer are superposed with the axial lines of the N jet flow spray holes one by one; wherein N is more than or equal to 4.
And a flow guide structure is arranged on the inner wall of the cavity sleeve body and positioned around the jet orifice.
The shape of the jet spray hole is one of a cylinder shape, an oval shape or a round corner rectangle.
The invention also provides a control system of the jet flow precombustion chamber of the gasoline engine sharing oil injection ignition, which comprises the following components: the oil injection control module is used for controlling the oil injection time, the oil injection pulse width and the injection pressure of the oil injector; an electronic control system (ECU) for calculating the current fuel concentration according to the fuel injection time and the fuel injection pulse width so as to calculate the ignition time of the spark plug; and the ignition control module is used for controlling the spark plug electrode to carry out ignition so as to realize ignition in the precombustion chamber.
The fuel injection control method of the jet flow precombustion chamber of the gasoline engine sharing fuel injection ignition comprises the following steps: the cone angle and the spray width of the conical spray are regulated and controlled through the injection pressure, and the overlapping proportion of the projection area of the spray cone angle projected on the cavity sleeve body of the precombustion chamber and the area of the precombustion chamber hole is regulated, so that the fuel oil proportion of the precombustion chamber and the main combustion chamber is regulated.
The invention also provides a control method of the gasoline engine jet flow precombustion chamber sharing oil injection ignition, which comprises the following steps:
s1: the air inlet valve/air inlet of the engine is opened, the piston moves downwards, the oil injection control module calculates the mass of air in the cylinder according to the air inlet and exhaust phases of the engine, and calculates the required fuel oil amount of the precombustion chamber/the main combustion chamber according to the equivalence ratio. And before the ignition of the intake stroke and the compression stroke, solving required oil injection parameters including but not limited to oil injection pressure, oil injection time, oil injection pulse width and the like according to the calculated total oil injection quantity and the fuel oil ratio of the pre-combustion chamber/the main combustion chamber.
S2: when the calculated oil injection time is reached, the oil injection control module calculates the required oil injection time and oil injection pulse width by combining the running state of the engine and an oil injection control spectrum preset by an electronic control system (ECU), sends an oil injection instruction to the oil injector when the piston reaches the preset oil injection time before a combustion top dead center, so that the oil injector in the cavity of the precombustion chamber injects oil, controls the oil injection time and the oil injection pulse width of the oil injector in real time, directly injects fuel oil spray into the main combustion chamber through jet orifices in an air inlet stroke and a compression stroke, simultaneously reflects part of the fuel oil spray or partially remains in the precombustion chamber due to a jet orifice flow guide structure, and fully diffuses the fuel oil spray and fresh air in the main combustion chamber and the precombustion chamber after being mixed;
s3: when the piston reaches the position near the top dead center of the compression stroke, a small amount of fuel is injected into the pre-combustion chamber again, and the part of fuel is completely reserved in the pre-combustion chamber and used for improving the fuel concentration in the pre-combustion chamber, so that the jet ignition effect is promoted. The electronic control system (ECU) calculates the current fuel concentration of a precombustion chamber and a main combustion chamber according to the oil injection time and the oil injection pulse width so as to calculate the ignition time of the spark plug, and sends an ignition signal to an ignition control module of the electronic control system (ECU), the ignition control module controls the spark plug electrode to perform ignition, then combustible mixed gas in the precombustion chamber starts to combust, the temperature and the pressure sharply rise, and the ignited mixed gas in the precombustion chamber can be sprayed to the main combustion chamber through the jet flow spray holes so as to form flame jet flow;
s4: the combustible mixed gas in the main combustion chamber is ignited by flame jet flow, and starts diffusion combustion, so that ignition, jet flow and a combustion process in the main combustion chamber in the whole pre-combustion chamber are realized.
The control method of the jet flow precombustion chamber of the shared oil-injection ignition gasoline engine is characterized by comprising the following steps: the fuel injector can regulate and control the fuel ratio in the main combustion chamber/the precombustion chamber through multiple times of fuel injection. The main combustion chamber is filled with a large part of primary fuel oil by injecting the primary fuel oil near the bottom dead center, a small amount of fuel oil is injected into the pre-combustion chamber before ignition, all the fuel oil is reserved in the pre-combustion chamber, and the ignition time is calculated according to a corresponding calculation method, so that the effects of diffusion combustion and jet ignition are realized.
The control method for the jet flow precombustion chamber of the shared oil injection ignition gasoline engine has the advantages that: by shortening the multiple oil injection intervals while shortening the multiple oil injection in the early stages of the intake stroke and the compression stroke, the proportion of the fuel oil diffusion from the precombustion chamber to the main combustion chamber is reduced through the characteristic of low oil injection pressure in the nonlinear region of the oil injector, and the fuel concentration of the precombustion chamber is improved.
The invention also provides a jet ignition gasoline engine which comprises the jet pre-combustion chamber of the gasoline engine and realizes jet ignition combustion in the pre-combustion chamber by adopting the control method.
Compared with the prior art, the invention has the beneficial effects that:
when the N-hole electromagnetic type oil sprayer (N is more than or equal to 4) or the outward-opening oil sprayer is arranged in the precombustion chamber, and during spraying, fuel oil spray can uniformly reach the inner wall surface of the cylindrical cavity sleeve body, and because of the relative position relation between the N spray holes (N is more than or equal to 4) on the side surface of the cylindrical cavity sleeve body and the corresponding oil sprayer, the spray can be directly injected into the external main combustion chamber through the N spray holes without being blocked, so that the fuel oil spray can be injected into the precombustion chamber and the main combustion chamber only by using one oil sprayer and arranging the oil sprayer in the precombustion chamber, and the whole processes of fuel oil spraying diffusion and ignition combustion of the precombustion chamber and the main combustion chamber are completed.
By calculating parameters such as spray width, jet hole diameter, bottom ventilation small hole area, fuel injection quantity and the like, a reasonable ignition-combustion control method is set, and the combustible mixed gas in the precombustion chamber is ignited by using a spark plug in the precombustion chamber to form flame jet flow and then ignite the combustible mixed gas in the main combustion chamber, so that the fuel injection design is simplified, and the combustion stability effect is improved.
Drawings
FIG. 1 is a schematic diagram of a jet prechamber of a gasoline engine sharing fuel injection ignition according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a jet flow precombustion chamber of a gasoline engine sharing fuel injection ignition according to a second embodiment of the present invention.
FIG. 3 is an enlarged partial view of the prechamber of FIG. 2.
In the figure, 1 is a main shell, 2 is an oil injector, 3 is a spark plug, 4 is a cavity sleeve, 5 is a spark plug electrode, 6 is a precombustion chamber, 7 is a spray hole, 8 is an oil injector nozzle, 9 is a cavity sleeve bottom structure, 10 is a fuel spray hole, 11 is a scavenging hole, and 12 is a flow guide structure.
Detailed Description
The present invention will be described with reference to specific examples.
Example one
As shown in fig. 1, a jet pre-chamber of a gasoline engine sharing fuel injection ignition comprises: the device comprises a main shell 1, a cavity sleeve 4, an oil injector 2, a spark plug 3, an oil injector nozzle 8 and a spark plug electrode 5. The cavity sleeve body 4 is arranged below the main shell 1, and the cavity sleeve body 4 and the main shell 1 are integrated up and down to form a precombustion chamber cavity 6. The precombustion chamber is arranged at the top of a combustion chamber of the spark ignition type internal combustion engine.
Specifically, the cavity sleeve 4 is cylindrical, the bottom of the cavity sleeve 4 is provided with a cavity sleeve bottom structure 9, and the cavity sleeve bottom structure 9 is hemispherical and has a circular cross section. The cavity enclosed by the lower end surface of the main shell 1 and the cavity sleeve body 4 forms a precombustion chamber cavity 6. In this embodiment, the prechamber is mounted on the engine head of a spark-ignition internal combustion engine.
The lower end of the fuel injector 2 penetrates through the main shell 1 from the upper center of the main shell 1 and extends into the precombustion chamber cavity 6; the lower end of the spark plug 3 extends obliquely through the main housing 1 from above the main housing 1 and into the prechamber cavity 6. The spark plug electrode 5 is provided at the lower end of the spark plug 3. The injector nozzle 8 is arranged at the lower end of the injector 2, namely only one injector 2 is arranged in the middle in the precombustion chamber,
the cavity sleeve body 4 is provided with a jet flow spray hole 7 and a scavenging air hole 11.
Specifically, the jet flow spray holes 7 are formed in the side face of the cavity sleeve body bottom structure 9, the number of the jet flow spray holes 7 is N, N is larger than or equal to 4, the jet flow spray holes 7 are symmetrical with respect to the central axis of the precombustion chamber, and the jet flow spray holes 7 are uniformly distributed on the circumference of the side face of the cavity sleeve body bottom structure 9. The air vent 11 is arranged at the bottom of the cavity sleeve body bottom structure 9, the number of the air vent 11 is not limited, and the aperture of the air vent 11 is far smaller than that of the jet flow spray hole 7. A flow guide structure 12 is processed on the inner wall of the cavity sleeve body bottom structure 9 of the cavity sleeve body 4 around the jet flow orifice 7. The jet nozzle holes 7 are located inside the combustion chamber of a spark ignition internal combustion engine.
In this embodiment, the jet nozzle hole 7 is cylindrical. In other embodiments of the invention, the jet orifice 7 may also be oval or rounded rectangle in shape, etc.
In this embodiment, the fuel injector 2 is an outward-opening fuel injector, a central axis between the outer edge and the inner edge of the conical spray of the outward-opening fuel injector coincides with the axes of the N jet injection holes 7, and the aperture of each jet injection hole 7 is between the maximum width and the minimum width of the conical spray.
The design parameter calculation steps of the N jet flow spray holes 7 and the bottom scavenging holes 11 on the side surface of the cylindrical cavity of the precombustion chamber are as follows:
step 1: the angle of the cylindrical jet flow spray hole 7 on the side surface of the bottom structure 9 of the cavity sleeve body is superposed with the spraying axis of the oil sprayer 2, and the jet flow spray holes 7 are symmetrically arranged around the central axis of the precombustion chamber.
Step 2: the spray penetration distance L is calculated by the relevant parameters of the oil injector, such as the diameter of a spray hole of the oil injector, the oil injection pressure and the like, and combining the internal pressure of the precombustion chamber and the pressure of the main combustion chamber 0 And the range of spray cone angles theta, followed by L 0 And theta may determine the spray width L of the spray of the injector at different locations 1 。
And 3, step 3: since the jet hole diameter/spray width ratio is related to the fuel quantity required for the main combustion chamber/total fuel quantity ratio, the prechamber/main combustion is based on the total fuel quantity per cycleThe combustion chamber volume and the respective required fuel quantity can determine the jet hole diameter d, and the jet hole diameter d is ensured to be between the maximum width and the minimum width of the spray. And then the cross-sectional area S of each jet hole can be calculated 0 。
And 4, step 4: the volume of the precombustion chamber is 1% -2.5% of the main combustion volume of the top dead center, and the volume V of the precombustion chamber is obtained through calculation.
And 5: the larger aperture of the precombustion chamber can cause the fuel to be quickly lost to the main combustion chamber, thereby preventing the pressure of the precombustion chamber from increasing and influencing the injection; the smaller aperture is unfavorable for scavenging, and the residual waste gas in the precombustion chamber is promoted. The combustion effect in the prechamber is mainly influenced by the residual exhaust gas rate, which is determined by the sum A of all the hole areas in the prechamber 6 and the volume V of the prechamber 6, whereby the A/V ratio is preferably between 2 and 4.5. Therefore, the sum A of the area of all the N jet flow jet holes N which are not less than 4 and the bottom scavenging pores on the precombustion chamber 6 can be obtained through calculation.
And 6: the sum A of the areas of all N jet spray holes 7N which are more than or equal to 4 and the scavenging holes 11 at the bottom on the precombustion chamber and the cross section area S of each jet spray hole 7 0 The area S of the bottom ventilation hole 11 can be calculated 1 。
In this embodiment, the maximum width of the spray is 4mm, and the aperture of the jet nozzle 7 is 3.5mm.
The control system of the gasoline engine jet flow precombustion chamber with the shared oil injection ignition comprises an oil injection control module, a fuel injection control module and a fuel injection control module, wherein the oil injection control module is used for controlling the oil injection time, the oil injection pulse width and the injection pressure of the oil injector 2; an electronic control system (ECU) for calculating a current fuel concentration from the fuel injection timing and the fuel injection pulse width to calculate an ignition timing of the ignition plug 3; and the ignition control module is used for controlling the spark plug electrode 5 to perform ignition so as to realize ignition in the pre-combustion chamber.
When the fuel injector in the cavity 6 of the precombustion chamber sprays fuel, the fuel spray can be directly injected into the main combustion chamber for diffusion by guiding N jet flow spray holes N to be more than or equal to 4, and meanwhile, partial fuel is controlled to be remained in the precombustion chamber through the diameter of the jet flow holes and the spray width, so that the combustion process in the precombustion chamber is completed. The specific control method comprises the following steps:
s1: opening an air inlet valve or an air inlet of the engine, moving a piston downwards, calculating the required oil injection time and oil injection pulse width by an oil injection control module according to the running state of the engine and an oil injection control spectrum preset by an ECU (electronic control Unit), sending an oil injection instruction to an oil injector 2 when the piston reaches 0-30 DEG CA (central authority) before a bottom dead center, injecting oil injection to the oil injector 2 in a cavity 6 of the precombustion chamber, controlling the oil injection time and the oil injection pulse width of the oil injector 2 in the cavity 6 of the precombustion chamber in real time, injecting fuel oil spray into the precombustion chamber and the main combustion chamber simultaneously in an air inlet stroke and a compression stroke, and fully diffusing the fuel oil spray and fresh air in the main combustion chamber and the precombustion chamber after mixing. Specifically, the oil injection time is 0-60 CA degrees before the piston reaches the bottom dead center in the intake stroke, so that the pressure stability of the main combustion chamber and the precombustion chamber is ensured, and stable spray diffusion is realized.
S2: when the piston reaches the position near the top dead center of the compression stroke, the fuel injection control module sends an instruction to the fuel injector 2 again to inject a small amount of fuel into the pre-combustion chamber, and the part of fuel is completely reserved in the pre-combustion chamber and used for improving the fuel concentration in the pre-combustion chamber, so that the jet ignition effect is promoted. The electronic control system ECU calculates the current fuel concentration equivalence ratio of the precombustion chamber and the main combustion chamber according to the fuel injection time and the fuel injection pulse width so as to calculate the ignition time of the spark plug 3, and sends an ignition signal to an ignition control module of the electronic control system ECU, the ignition control module controls the spark plug electrode 5 to perform ignition, then, combustible mixed gas in a cavity 6 of the precombustion chamber starts to combust, the temperature and the pressure rapidly rise, and the ignited mixed gas in the cavity 6 of the precombustion chamber can be ejected to the main combustion chamber through a jet orifice 7 so as to form flame jet;
s3: the combustible mixture in the main combustion chamber is ignited by flame jet flow, and starts diffusion combustion, so that ignition, jet flow and combustion process of the main combustion chamber in the whole precombustion chamber are realized.
Example two
As shown in FIGS. 2-3, the difference between the present embodiment and the first embodiment is that the fuel injector 2 is an N-hole electromagnetic fuel injector, where N is equal to or greater than 4, the N-hole electromagnetic fuel injector has N fuel injection holes 10, where N is equal to or greater than 4, that is, the number of the fuel injection holes 10 is the same as the number of the jet injection holes 7. The axes of all the N cylindrical jet spray holes 7 coincide with the axes of N fuel spray holes 10 of the centrally-arranged N-hole electromagnetic fuel injector one by one.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, only for convenience of description and simplification of description, but do not indicate and imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to be construed as limiting the present invention.
The above is only a preferred embodiment of the present invention, but the present invention is not limited to the above specific embodiments, and those skilled in the art can make several variations and modifications without departing from the spirit of the present invention, which all fall into the protection scope of the present invention.
Claims (10)
1. The utility model provides a sharing gasoline engine efflux precombustion chamber of oil spout ignition, characterized by includes:
a main housing (1);
the cavity sleeve body (4) is arranged below the main shell (1), and a cavity formed by enclosing the lower end surface of the main shell (1) and the cavity sleeve body (4) forms a precombustion chamber cavity (6); a cavity sleeve body bottom structure (9) is arranged at the bottom of the cavity sleeve body (4), a jet flow spray hole (7) and a ventilation hole (11) are arranged on the cavity sleeve body bottom structure (9), the jet flow spray hole (7) is arranged on the side face of the cavity sleeve body bottom structure (9), and the ventilation hole (11) is arranged at the bottom of the cavity sleeve body bottom structure (9);
an oil injector (2); the lower end of the fuel injector (2) penetrates through the main shell (1) from the upper center of the main shell (1) and extends into the pre-combustion chamber cavity (6), and the lower end of the fuel injector is provided with an injector nozzle (8);
a spark plug (3), wherein the lower end of the spark plug (3) obliquely penetrates through the main shell (1) from the upper part of the main shell (1) and extends into the prechamber cavity (6);
a spark plug electrode (5) provided at a lower end of the spark plug (3); and
and the flow guide structure (12) is arranged on the inner wall of the cavity sleeve body (4) and is positioned at the periphery of the jet flow spray hole (7).
2. The jet prechamber for a gasoline engine with shared fuel injection and ignition as set forth in claim 1, characterized in that the flow guide structure (12) is arranged in a bowl shape around the jet orifice (7).
3. The jet precombustor of a gasoline engine sharing fuel injection ignition according to claim 1, characterized in that the fuel injector (2) is an outward opening fuel injector, and the central axis between the outer edge and the inner edge of the conical spray of the outward opening fuel injector coincides with the axis of the jet orifice (7).
4. The jet prechamber for a gasoline engine with shared fuel injection and ignition as set forth in claim 3, characterized in that the number of jet orifices (7) is N and are uniformly arranged on the circumference of the side surface of the cavity body bottom structure (9), the central axis between the outer edge and the inner edge of the conical spray of the outward opening fuel injector coincides with the axes of the N jet orifices (7), and the aperture of the jet orifices (7) is between the maximum width and the minimum width of the conical spray; wherein N is more than or equal to 4.
5. The jet pre-combustion chamber of the gasoline engine with shared fuel injection ignition as claimed in claim 1, characterized in that the fuel injector (2) is an electromagnetic fuel injector, and the axis of the fuel injection hole (10) of the electromagnetic fuel injector is coincident with the axis of the jet injection hole (7).
6. The jet prechamber for a gasoline engine with shared fuel injection and ignition as set forth in claim 5, characterized in that the number of jet orifices (7) is N and they are uniformly arranged on the circumference of the side of the cavity housing bottom structure (9), the electromagnetic fuel injector has N fuel orifices (10), and the axes of the N fuel orifices (10) of the electromagnetic fuel injector coincide with the axes of the N jet orifices (7) one by one; wherein N is more than or equal to 4.
7. A control system for a jet prechamber of a gasoline engine with shared fuel injection and ignition as described in claims 1-6, comprising:
the oil injection control module is used for controlling the oil injection time and the oil injection pulse width of the oil injector (2);
an electronic control system (ECU) for calculating the current fuel concentration according to the fuel injection time and the fuel injection pulse width so as to calculate the ignition time of the spark plug (3); and
and the ignition control module is used for controlling the spark plug electrode (5) to perform ignition so as to realize ignition in the precombustion chamber.
8. A method of controlling a jet prechamber for a gasoline engine with shared fuel injection and ignition as described in claims 1-6, comprising the steps of:
s1: calculating the mass of air in a cylinder according to the intake and exhaust phases of the engine, and calculating the fuel oil amount required by the precombustion chamber/main combustion chamber according to the equivalence ratio, wherein before the ignition of an intake stroke and a compression stroke, the required fuel injection parameters are solved according to the calculated total fuel injection amount and the fuel oil ratio of the precombustion chamber/main combustion chamber;
s2: when the calculated oil injection time is reached, the oil injection control module calculates the required oil injection time and oil injection pulse width by combining the running state of the engine and an oil injection control spectrum preset by an electronic control system (ECU), when a piston reaches the preset oil injection time before a combustion top dead center, an oil injection instruction is sent to an oil injector (2), so that the oil injector (2) in the cavity of the precombustion chamber injects oil, the oil injection time and the oil injection pulse width of the oil injector (2) are controlled in real time, the fuel oil spray is directly injected into the main combustion chamber through a jet flow spray hole (7) in an air inlet stroke and a compression stroke, meanwhile, part of the fuel oil spray is reflected or partially remained in the precombustion chamber by a diversion structure (12), and the fuel oil spray is fully diffused in the main combustion chamber and the precombustion chamber after being mixed with fresh air;
s3: when the piston reaches the vicinity of the top dead center of a compression stroke, the electronic control system (ECU) calculates the current fuel concentration of a pre-combustion chamber and a main combustion chamber according to the fuel injection time and the fuel injection pulse width to calculate the ignition time of the spark plug (3), and sends an ignition signal to an ignition control module of the electronic control system (ECU), the ignition control module controls the spark plug electrode (5) to perform ignition, at the moment, combustible mixed gas in a cavity (6) of the pre-combustion chamber starts to combust, the temperature and the pressure sharply rise, and the ignited mixed gas in the cavity (6) of the pre-combustion chamber is then sprayed to the main combustion chamber through the jet flow spray hole (7) to form flame jet flow;
s4: the combustible mixed gas in the main combustion chamber is ignited by flame jet flow, and starts to be diffused and combusted, so that ignition, jet flow and combustion in the main combustion chamber in the whole precombustion chamber are realized.
9. The control method of claim 8, wherein said injection parameters include injection pressure, injection timing and injection pulsewidth.
10. A jet ignition gasoline engine comprising the gasoline engine jet prechamber of claims 1-6 and employing the control method of claims 7-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211084490.9A CN115370465B (en) | 2022-09-06 | 2022-09-06 | Gasoline engine jet precombustion chamber with shared oil injection ignition, control method, system and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211084490.9A CN115370465B (en) | 2022-09-06 | 2022-09-06 | Gasoline engine jet precombustion chamber with shared oil injection ignition, control method, system and engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115370465A true CN115370465A (en) | 2022-11-22 |
| CN115370465B CN115370465B (en) | 2023-07-14 |
Family
ID=84070610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211084490.9A Active CN115370465B (en) | 2022-09-06 | 2022-09-06 | Gasoline engine jet precombustion chamber with shared oil injection ignition, control method, system and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115370465B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2840367A1 (en) * | 1978-09-16 | 1980-03-27 | Daimler Benz Ag | IC engine with precombustion chamber - has injected fuel impinging on baffle area equal to fuel jet section and screened inside chamber |
| DE2851784A1 (en) * | 1978-11-30 | 1980-06-12 | Daimler Benz Ag | Diesel engine fuel injection system - has sleeve with rounded top and offset hole inside precombustion chamber under injection valve |
| JPH07208170A (en) * | 1994-01-24 | 1995-08-08 | Isuzu Motors Ltd | Auxiliary chamber structure in auxiliary chamber type engine |
| US20020078919A1 (en) * | 2000-03-29 | 2002-06-27 | Takehiko Yasuoka | Direct-injection spark ignition engine |
| CN109899150A (en) * | 2019-02-18 | 2019-06-18 | 哈尔滨工程大学 | One kind being suitable for the micro- spray diesel oil of large-diameter-natural gas double fuel engine stratified combustion control method |
| CN113685261A (en) * | 2021-08-18 | 2021-11-23 | 天津大学 | Gasoline engine ignition mechanism containing shared jet orifice precombustion chamber |
| CN114902509A (en) * | 2020-01-14 | 2022-08-12 | 罗伯特·博世有限公司 | Pre-chamber spark plug with improved cap |
-
2022
- 2022-09-06 CN CN202211084490.9A patent/CN115370465B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2840367A1 (en) * | 1978-09-16 | 1980-03-27 | Daimler Benz Ag | IC engine with precombustion chamber - has injected fuel impinging on baffle area equal to fuel jet section and screened inside chamber |
| DE2851784A1 (en) * | 1978-11-30 | 1980-06-12 | Daimler Benz Ag | Diesel engine fuel injection system - has sleeve with rounded top and offset hole inside precombustion chamber under injection valve |
| JPH07208170A (en) * | 1994-01-24 | 1995-08-08 | Isuzu Motors Ltd | Auxiliary chamber structure in auxiliary chamber type engine |
| US20020078919A1 (en) * | 2000-03-29 | 2002-06-27 | Takehiko Yasuoka | Direct-injection spark ignition engine |
| CN1372617A (en) * | 2000-03-29 | 2002-10-02 | 玛志达株式会社 | Direct-injection spark ignition engine |
| CN109899150A (en) * | 2019-02-18 | 2019-06-18 | 哈尔滨工程大学 | One kind being suitable for the micro- spray diesel oil of large-diameter-natural gas double fuel engine stratified combustion control method |
| CN114902509A (en) * | 2020-01-14 | 2022-08-12 | 罗伯特·博世有限公司 | Pre-chamber spark plug with improved cap |
| CN113685261A (en) * | 2021-08-18 | 2021-11-23 | 天津大学 | Gasoline engine ignition mechanism containing shared jet orifice precombustion chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115370465B (en) | 2023-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7143738B2 (en) | Direct-injection spark-ignition internal combustion engine | |
| US5996548A (en) | Method of operating an internal combustion engine | |
| CN113202622A (en) | Combustion system and combustion control method of hydrogen internal combustion engine | |
| US20230040984A1 (en) | Air-assisted jet flame ignition device and ignition method thereof | |
| JP2004036554A (en) | Fuel injection device, internal combustion engine, and controlling method of fuel injection device | |
| CA1127483A (en) | Internal combustion engine with fuel injector | |
| JP3804879B2 (en) | Combustion method of direct injection diesel engine | |
| US6098588A (en) | Injection device and combustion process for an internal combustion engine | |
| US7234437B2 (en) | Direct-injection internal combustion engine and combustion method therefor | |
| CN115370465A (en) | Gasoline engine jet flow precombustion chamber sharing oil injection ignition, control method and system and engine | |
| CN113417733B (en) | Fuel-air separation active control type ignition chamber system | |
| JP2007138780A (en) | Auxiliary chamber type internal combustion engine | |
| CN115126592A (en) | Hydrogen pre-combustion chamber type engine and control method thereof | |
| CN114233465A (en) | Ammonia fuel combustion system, engine and combustion control method | |
| JP2018150820A (en) | Gas engine | |
| CN216518262U (en) | Ignition system and engine | |
| JP3644057B2 (en) | Direct injection spark ignition internal combustion engine | |
| CN216518261U (en) | Ammonia fuel combustion system and engine | |
| CN217107276U (en) | Dual-fuel injector and dual-fuel engine | |
| US6938607B1 (en) | Fuel injection apparatus and control method thereof | |
| CN216894617U (en) | Combustion system and engine | |
| CN114109583A (en) | Ignition system and engine | |
| WO2020196204A1 (en) | Auxiliary-chamber-type internal combustion engine | |
| JPH08144884A (en) | Direct injection type gasoline internal combustion engine | |
| JP5120002B2 (en) | In-cylinder direct injection spark ignition internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |