CN115217699A

CN115217699A - Vehicle, fuel injector and control method thereof

Info

Publication number: CN115217699A
Application number: CN202210202522.4A
Authority: CN
Inventors: 杜家坤; 陈泓; 江枭枭; 李钰怀; 吴威龙; 张双
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2022-03-02
Filing date: 2022-03-02
Publication date: 2022-10-21

Abstract

The application provides a vehicle, a fuel injector and a control method thereof. The fuel injector includes: the main body is internally provided with a water spraying channel, an air spraying channel and a spraying channel; the inlet of the air injection channel is used for being connected with an air source, and the outlet of the air injection channel is communicated with the first inlet of the injection channel; the inlet of the water spraying channel is used for receiving a water source, and the outlet of the water spraying channel is communicated with the second inlet of the spraying channel; the outlet of the injection channel is provided with an injection port; the main control valve assembly is used for controlling the opening or closing of the injection ports, and the injection ports are used for injecting the water-gas mixture. The present application provides a fuel injector capable of injecting a water-gas mixture.

Description

Vehicle, fuel injector and control method thereof

Technical Field

The present disclosure relates to the field of vehicle engine combustion control, and more particularly, to a fuel injector, a control method of the fuel injector, and a vehicle.

Background

In the running process of the automobile engine, water is sprayed into the cylinder by adopting a water spraying technology. The evaporation and heat absorption of water bring about the reduction of combustion temperature, and the time of spontaneous combustion of the mixed gas at the tail end can be effectively prolonged, so that the occurrence of detonation is inhibited, and the reduction of the temperature in the cylinder brought by water spraying is beneficial to the reduction of the speed of generating nitrogen oxides, and finally the reduction of the discharge amount of NOx is brought.

In the existing scheme of the engine for combusting combustible gas by adopting a water spraying technology, an additional water sprayer needs to be arranged, the arrangement process is complex and is limited by space, and the injection efficiency is low.

Therefore, a new type of injector is needed.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

It is an object of the present application to provide a fuel injector capable of injecting a mixture of gas and water.

Another object of the present application is to provide a control method of a fuel injector capable of injecting a gas-water mixture.

Another object of the present application is to provide a vehicle having a fuel injector capable of injecting a mixture of air and water.

In order to solve the technical problem, the following technical scheme is adopted in the application:

according to a first aspect of an embodiment of the present application, there is provided a fuel injector. The fuel injector comprises a main body, wherein a water spraying channel, an air spraying channel and an injection channel are formed in the main body; the inlet of the air injection channel is used for being connected with an air source, and the outlet of the air injection channel is communicated with the first inlet of the injection channel; the inlet of the water spraying channel is used for receiving a water source, and the outlet of the water spraying channel is communicated with the second inlet of the spraying channel so as to spray water into the spraying channel to mix water and air; the outlet of the injection channel is provided with an injection port; and the main control valve assembly is used for controlling the opening or closing of the injection port, and the injection port is used for injecting the water-gas mixture.

In some embodiments, the body extends in the direction of the injection channel such that the flow cross-section where the injection channel is extended is smaller than the flow cross-section of the first inlet.

In some embodiments, the position of the first inlet is set forward of the position of the second inlet in the fuel flow direction in the injection passage; the section of the front section pipe section at the position of the second inlet is gradually reduced, and the section of the rear section pipe section at the position of the second inlet is gradually increased.

In some embodiments, the second inlet is provided at the narrowest tube end of the injection passage.

In some embodiments, the water spray channel comprises a water inlet pipe section and a water homogenizing pipe section communicated with the spray channel; the water homogenizing pipe section is provided with a water homogenizing part which is annularly arranged on the outer wall of the jet channel and is internally provided with an annular cavity; the second inlet comprises a plurality of water inlet holes which are annularly arranged, and the annular cavity is communicated with the injection channel through the plurality of water inlet holes.

In some embodiments, the water homogenizing pipe section further comprises a flow limiting pipe, one end of the flow limiting pipe is communicated with the water inlet pipe section, and the other end of the flow limiting pipe is communicated with the water homogenizing pipe section; the corresponding flow section of the flow limiting pipe is smaller than that of the water inlet pipe section.

In some embodiments, the fuel injector further comprises a water injection valve assembly; the water spray valve component comprises a water spray needle valve, an elastic piece, an electromagnetic valve and an armature; the water spray needle valve is fixedly connected with the armature and extends into the water spray channel; two ends of the elastic piece are respectively connected to the armature and the main body of one side of the armature, which is far away from the water spray needle valve, and the water spray needle valve blocks an outlet of a water spray channel under the elastic pressure of the elastic piece; when the solenoid valve is energized, the solenoid valve compresses the elastic member by driving the armature to move, so that the water spray needle valve opens the outlet of the water spray passage.

In some embodiments, the main control valve assembly includes a main needle valve disposed within the injection passage that blocks or opens an outlet of the injection passage by moving along the injection passage.

According to a second aspect of the present application, there is also provided a vehicle comprising an engine combustion chamber, an air intake in communication with the engine combustion chamber, and a fuel injector as described above;

the fuel injector is arranged on a combustion chamber of the engine to inject water-gas mixture or combustible gas into an engine cylinder; or

The fuel injector is installed on the intake passage to inject a water-gas mixture or a combustible gas into the intake passage.

According to a third aspect of the embodiments of the present application, there is also provided a control method of a fuel injector, applied to the fuel injector as described above, the method including: acquiring load working condition parameters of a vehicle engine; under the condition that the load working condition parameter is higher than a preset load threshold value, controlling a jet orifice to jet a water-gas mixture; and controlling the injection port to inject the combustible gas under the condition that the load condition parameter is lower than or equal to a preset load threshold value.

According to the technical scheme, the beneficial effects of the application are as follows:

in this application, on the one hand, fuel injector is integrated as an organic whole with the function of spouting water and spouting combustible gas, compact structure does benefit to and arranges, and enables fuel injector's job stabilization nature and can improve, and on the other hand, when taking place the burning in the engine combustion chamber, can also give full play to the cooling effect of the high specific heat of water vaporization endotherm and vapor, reduce the detonation tendency, improve the engine thermal efficiency to and reduce the production of polluting emissions such as NOx, have positive promotion effect to the high-efficient low combustion process that discharges of engine.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic structural view of a fuel injector provided according to a first embodiment of the present application.

Fig. 2 is a schematic structural view of an injection channel provided according to a second embodiment of the present application.

FIG. 3 is a cross-sectional schematic view of (a portion of) a fuel injector provided according to an embodiment of the present application.

FIG. 4 is a cross-sectional schematic view of a (complete) fuel injector provided according to an embodiment of the present application.

FIG. 5 is a flow chart of a method of controlling a fuel injector provided in accordance with an embodiment of the present application.

The reference numerals are illustrated below:

1. a main body; 10. a water spray channel; 20. an air injection passage; 30. an injection channel;

11. a water inlet pipe section; 11a, a water storage cavity; 12. a water homogenizing pipe section; 12a, a water homogenizing part;

31. an ejection port; 32. a second inlet; 32a, a water inlet hole;

41. a water spray needle valve; 42. an elastic member; 43. an electromagnetic valve; 44. an armature;

51. a main needle valve; 52. a main armature; 53. a primary elastic member; 54. a main solenoid valve.

Detailed Description

While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.

Thus, a feature indicated in this specification is intended to describe one of the features of an embodiment of the application and does not imply that every embodiment of the application must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various elements of the present application not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

Taking a hydrogen engine as an example, when the existing hydrogen engine adopts a water spraying technology, additional water sprayers are required to be adopted, the water sprayers are independently arranged and are limited by the limit of tempering of an air passage of the hydrogen engine, the hydrogen engine generally adopts a mode of direct hydrogen injection in a cylinder to realize the introduction of hydrogen, at the moment, the water sprayers cannot be arranged in an air inlet channel and are difficult to be arranged in a mode of direct water injection in the cylinder, and the aspects of water spraying, temperature reduction and nitrogen oxide control are greatly reduced.

The preferred embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, the main body 1 is formed with a water spray passage 10, an air spray passage 20, and a spray passage 30.

Specifically, the main body 1 may be a sealed main body, and at least three channels, i.e., a water spraying channel 10, an air spraying channel 20, and an injection channel 30, are formed therein. The main body 1 may be made of metal to improve structural rigidity. Illustratively, taking the orientation shown in the figures as an example, the main body 1 is substantially elongated, and the two ends of the main body 1 are respectively a front end and a rear end. The water spraying passage 10 and the air spraying passage 20 are respectively positioned at the left side and the right side of the front end of the main body 1, the spraying passage 30 extends along the length direction of the main body 1, the outlet of the spraying passage 30 is provided with a spraying opening 31, and the spraying opening 31 is positioned at the lower side of the rear end of the main body 1. One or more ejection ports 31 may be provided to improve ejection uniformity.

The inlet of the gas injection channel 20 is used for connecting a gas source, and the outlet of the gas injection channel 20 is communicated with the first inlet of the injection channel 30 so as to inject the combustible gas into the injection channel 30. Wherein, the gas source can be a hydrogen source, an oxyhydrogen composition source, a combustible gas source such as methane, and the like.

The inlet of the water spray channel 10 is adapted to receive a source of water and the outlet of the water spray channel 10 communicates with the second inlet of the spray channel 30 to enable water to be sprayed into the spray channel 30. The water source is liquid water, or liquid such as ethanol and the like used for avoiding the backfire of the engine, improving the detonation tendency and reducing the exhaust energy loss, and the change of the fuel injected by the fuel injector can be realized by only changing the type of the fuel supplied by an external system.

The injection passage 30 is used to mix water and combustible gas and inject them from the injection port 31 into the combustion chamber. Since the combustible gas entering from the first inlet usually has a strong gas pressure, when the water drops enter the injection channel 30, the water drops will be hit and broken by the high-speed combustible gas, so that the water drops are entrained by the high-speed combustible gas and move along the gas flow direction until the gas flow reaches the injection port.

The main control valve assembly is used to control the opening or closing of the injection port 31. Specifically, with the injection port 31 open, the entrained gaseous fuel flowing at high velocity moves in the direction of the gas flow until it is injected into the combustion chamber. With the injection port closed, the injection passage 30 and the combustion chamber do not communicate with each other, and no fuel is supplied from the fuel injector in the combustion chamber.

From this, the fuel injector that this application provided is integrated as an organic whole with the function of spouting water and spouting combustible gas, and compact structure does benefit to the arrangement, and enables fuel injector's job stabilization nature and can improve. In addition, when combustion occurs in the engine combustion chamber, the cooling effect of water vaporization heat absorption and high specific heat of water vapor can be fully exerted, the knocking tendency is reduced, the heat efficiency of the engine is improved, the generation of pollution emissions such as NOx is reduced, and the positive promotion effect is achieved on the high-efficiency and low-emission combustion process of the engine.

It should be noted that, in the case that water is injected into the combustion chamber with the combustible gas while keeping fine droplets, the effects of water vaporization heat absorption and the cooling effect of high specific heat of water vapor during combustion in the main combustion chamber of the engine can be improved, the knocking tendency can be reduced, the thermal efficiency of the engine can be improved, the generation of pollution emissions such as NOx can be reduced, and the positive promotion effect can be achieved on the high-efficiency low-emission combustion process of the engine. If the water sprayed from the second inlet collides with the gas fuel flowing at high speed, the water is broken into fine liquid drops, and the flow speed of the gas fuel is positively correlated with the breaking degree of the water drops.

The technical means adopted by the present application for ensuring the flow rate of gaseous fuel will be described below.

Fig. 2 is a schematic structural view of an injection channel 30 provided according to a second embodiment of the present application. As shown in fig. 2, the main body 1 extends towards the injection channel 30, and illustratively, the main body 1 may extend in an arc shape towards the injection channel 30 to form a flow bottleneck in the injection channel 30, and it is easily understood that when the main body 1 extends towards the injection channel 30 at a plurality of positions, a plurality of flow bottlenecks may be formed. Each flow bottleneck can be provided with a second inlet 32 to increase the frequency of water-air mixing and improve the mixing efficiency. It is known that, according to the principles of fluid mechanics, the flow rate of the fluid increases when the flow cross-section decreases, and therefore, by locating the second inlet at the flow bottleneck, water can be injected into the higher velocity gas stream.

In one embodiment, the second inlet 32 may also be located at the narrowest point of the injection passage 30, so that the narrowest point corresponds to the maximum fluid flow rate to ensure the mixing efficiency and mixing degree of the water and the air.

In one embodiment, the body 1 may extend in the direction of the injection channel 30, such that the flow cross-section of the injection channel 30 where it is extended is smaller than the flow cross-section of the injection channel 30 at the first inlet, such that the flow rate of the injection channel 30 where it is extended is greater than the flow rate when it is injected, and the second inlet 32 is located at the extended position, thereby ensuring the mixing efficiency and mixing degree of the water and the air.

In further embodiments, the position of the first inlet is set forward of the position of the second inlet 32 in the direction of fuel flow in the injection passage 30, thereby ensuring that water is injected into the high-speed air stream in the injection passage 30. Furthermore, the section of circulation of anterior segment pipeline section from the position of second entry can also be the convergent setting to can further increase at the fluid velocity of flow of second entry, can make the water that spouts through the second entry collide with the gaseous fuel after accelerating, promote gas-water mixing degree and efficiency. The flow-through cross-section of the rear section of the pipe section at the location of the second inlet may be arranged in a gradually widening manner, so that the fluid flow rate can be increased and the supply of fuel to the combustion chamber can be ensured. Specifically, in the front section pipe section at the position of the second inlet, the airflow pressure of the combustible gas is gradually increased along the airflow direction, so that the flowing speed of the gas fuel is gradually increased, and the gas flow rate is maximum at the position of a flowing bottleneck, so that the water sprayed in through the second inlet collides with the accelerated gas fuel and is crushed into fine liquid drops. The circulating section of the rear section pipe section at the position of the second inlet is gradually arranged, so that the flow can be ensured, and the injection speed is improved. In other words, the fine droplets are entrained by the mass of gaseous fuel flowing at high velocity and move in the direction of the gas flow until they reach the combustion chamber.

In summary, with the above design of the multiple injection channels 30, the fluid flow rate of the injection channel 30 can be increased, so as to increase the crushing degree of the water injected through the second inlet after colliding with the accelerated gas fuel, and keep the water in a fine droplet state, thereby achieving the effects of increasing the cooling effect of water vaporization heat absorption and high specific heat of water vapor in the combustion chamber of the engine, reducing the knocking tendency, improving the thermal efficiency of the engine, reducing the generation of pollutant emissions such as NOx, and actively promoting the high-efficiency low-emission combustion process of the engine, and on the other hand, achieving the rapid crushing of water droplets and preventing the problem of engine oil emulsification.

The technical means adopted by the present application for breaking up the liquid are described below.

FIG. 3 is a cross-sectional schematic view of (a portion of) a fuel injector provided according to an embodiment of the present application. FIG. 4 is a cross-sectional schematic view of a (complete) fuel injector provided according to an embodiment of the present application.

As shown in fig. 3 and 4, in this embodiment, the water spray channel 10 includes a water inlet pipe section 11 and a water homogenizing pipe section 12, and the water inlet pipe section 11 and the water homogenizing pipe section 12 are communicated with each other. The water inlet pipe section 11 is used for connecting an external water source, and the water homogenizing pipe section 12 is used for homogenizing the water flow flowing into the injection channel 30. The water homogenizing pipe section 12 is provided with a water homogenizing part 12a, the water homogenizing part 12a is annularly arranged on the outer wall of the injection channel 30, and an annular cavity is arranged in the water homogenizing part 12a. The second inlet comprises a plurality of water inlet holes 32a which are annularly arranged, and the annular cavity is communicated with the injection channel 30 through the plurality of water inlet holes 32a, so that water flow can be further uniform, water drops can be further refined, water is kept in a fine liquid drop state and is injected into the injection channel 30, and the water-air mixing degree is improved.

In one embodiment, the water homogenizing pipe section may further include a flow limiting pipe 12b, one end of the flow limiting pipe 12b is communicated with the water inlet pipe section 11, and the other end is communicated with the water homogenizing part 12a, wherein the corresponding flow cross section of the flow limiting pipe 12b may be smaller than the corresponding flow cross section of the water inlet pipe section 11, so as to restrict the amount of water sprayed into the spraying channel 30, and further to make the water flow uniform. The restrictor 12b can also be set according to the flow rate of the eductor so that the amount of water can be precisely controlled. In another embodiment, the water homogenizing pipe section 12 may be provided with a water control valve (not shown) to more precisely control the water flow rate and amount into the injection passage 30.

In one embodiment, the body has a water inlet portion extending laterally toward the front end of the body. The water inlet portion has a water inlet, and a water spray passage 10 is formed in the water inlet portion, whereby the connection stability between the water inlet passage and the spray passage 30 can be improved.

In one embodiment, the water storage cavity 11a may be provided at a position where the water inlet pipe segment 11 is communicated with the water homogenizing pipe segment 12, so as to reserve the water to be used when the water amount is too large, thereby stabilizing the flow rate of the liquid flowing into the injection passage 30 and improving the accuracy of the flow control.

The technical means adopted by the present application for water spray and/or flammable gas switching are described below.

In one embodiment, the fuel injector further comprises a water injection valve assembly, and the water injection valve assembly can be arranged in the water inlet portion, so that the water injection channel can be reliably controlled, and the fuel injector is beneficial to compact structure and stable operation.

The water spray valve assembly is used for independently controlling the on-off of the water spray channel 10. Specifically, the water spray valve assembly includes a water spray needle valve 41, an elastic member 42, a solenoid valve 43, and an armature 44. Wherein, the water spray needle valve 41 is fixedly connected with the armature 44 and extends into the water spray channel 10.

Both ends of the elastic member 42 are connected to the armature 44 and the main body of the armature on the side away from the water spray needle valve, respectively, and the water spray needle valve 41 blocks the outlet of the water spray passage 10 under the elastic pressure of the elastic member 42. Specifically, the elastic member 42 may be a spring, and one end of the elastic member 42 may be wound around the water spray needle 41 to provide uniform pressure to the water spray needle 41. When the solenoid valve is energized, the solenoid valve 43 compresses the elastic member 42 by driving the armature 44 to move, so that the water spray needle valve 41 opens the outlet of the water spray passage 10.

It should be noted that the corresponding plug on the water spray needle valve 41 may be extended outward at an acute angle to improve the reliability of plugging the inlet of the water homogenizing pipe section 12 with a smaller cross-sectional area, and the outer side of the plug may be provided with a buffering elastic surface to provide tight sealing.

Therefore, the on-off of the water injection channel 10 can be independently controlled through the water injection valve assembly, so that the fuel injector can provide three modes of water injection and/or combustible gas, and the control flexibility of the fuel injector is improved.

In one embodiment, the main control valve assembly may also employ a control scheme including a main needle valve, which includes a main needle valve 51, a main armature 52, a main elastic member 53, and a main solenoid valve 54. The main needle valve 51 provided in the injection passage 30 is moved along the injection passage 30 to block or open the outlet of the injection passage 30. Specifically, the main elastic member 53 may be sleeved on the main needle 51, and one end of the main elastic member 53 is connected to the main armature 52, and the other end is connected to the main body on the side of the main armature 52 opposite to the injection port 31. In the orientation shown in fig. 3 as an example, the front end of the main body 1 is formed with a receiving space for receiving a main control valve assembly, and a main needle valve 51 is disposed in the receiving space and extends in the direction of the injection passage 30. The main elastic member 53 has one end fixed to the main armature 52 and the other end fixed inside the main body 1. It should be noted that the plug corresponding to the main needle valve 51 can extend outwards at an obtuse angle, the main electromagnetic valve is electrified to drive the main armature to move, so that the main needle valve is pressed down, and the edge of the rear end of the main body and the edge of the plug corresponding to the main needle valve form an annular flow path, so that a combustible water-gas mixture or a combustible gas can be uniformly sprayed into the combustion chamber, the cooling effects of water vaporization heat absorption and high specific heat of water vapor are fully exerted, the detonation tendency is reduced, and the heat efficiency of the engine is improved.

To enhance understanding, the fuel injector provided herein is described below in one particular embodiment. In this embodiment, the combustible gas injected is hydrogen.

Specifically, hydrogen gas enters the injection passage 30 through the gas injection passage 20, flows through the injection passage 30 and reaches the bottom of the main needle valve 51 after the main solenoid valve 54 is energized, and is injected into the combustion chamber through a passage formed by the main needle valve 51 and the edge of the rear end of the main body with the corresponding plug of the main needle valve 51 depressed.

The water enters through the inlet of the water spray passage 10, is energized by the solenoid valve 43, and after the water spray needle valve 41 is lifted, flows into the restrictor duct 12b to reach the water uniforming portion 12a in the form of an annular flow passage. When high-speed combustible airflow flows through the tapered and divergent part of the annular flow passage, water in the annular flow passage is blown away due to the disturbance effect of the airflow, is broken into a large number of liquid drops under the action of the high-speed airflow, and is then entrained by the high-speed airflow and sprayed into the combustion chamber. The working mode is applied to the working conditions of the hydrogen engine above medium load, the temperature in the cylinder is reduced by spraying water, and the knocking tendency is further inhibited.

Of course, the water spray valve assembly does not work, only the main control valve assembly works, and the fuel injector is used as a single jet injector and applied to the working condition below the medium load of the hydrogen engine.

The present application also provides a vehicle comprising at least an engine combustion chamber, an air intake duct communicating with the engine combustion chamber, and a fuel injector as described above, wherein the fuel injector is mounted on the engine combustion chamber to inject a water-gas mixture or a combustible gas into the engine air intake duct; or a fuel injector is installed on the intake passage to spray a water-gas mixture or a combustible gas into the intake passage. The installation mode comprises fixed connection modes such as clamping, screw connection and the like. From this, through the fuel injector that the function integration of using water spray and spouting combustible gas is integrative, compact structure arranges in a flexible way, receives the space restriction little, and spouts combustible gas and water spray single control, and can realize the nimble switching of water spray and not water spray, can satisfy the demand of the multiple operating mode of engine. And because the engine still additionally has the spark plug to arrange, consequently, the space in the cylinder cap combustion chamber is very limited, consequently, can spray the fuel injector of aqueous vapor mixture in the application and be applied to automobile engine, has realistic meaning, can promote automobile engine, especially compact engine reliable operation degree and stability.

As shown in fig. 5, in this embodiment, the control method of the fuel injector is applied to the fuel injector as described above, and the control method may include at least the following two steps S510 and S520.

Step S510, obtaining load working condition parameters of a vehicle engine;

step S520, controlling the injection port to inject the water-gas mixture under the condition that the load working condition parameter is higher than a preset load threshold value; and under the condition that the load condition parameter is lower than or equal to a preset load threshold value, controlling the injection port to inject the combustible gas.

The load condition parameters of the engine can be obtained through a sensor arranged on the engine, and the load condition parameters of the engine can also be comprehensively judged according to the running road condition of the automobile, the automobile load condition, the running speed of the automobile and the like. The preset load threshold is a preset safety threshold, the jet orifice is controlled to jet the water-gas mixture under the condition that the load working condition parameter is higher than the preset load threshold, and the jet orifice is controlled to jet the combustible gas under the condition that the load working condition parameter is lower than or equal to the preset load threshold, so that the cooling effects of water vaporization heat absorption and high specific heat of water vapor can be fully exerted, the detonation tendency is reduced, the heat efficiency of the engine is improved, the use safety of the engine is improved, and the safety and the stability of an automobile using the combustible gas as a power source can be improved.

While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A fuel injector, comprising:

the main body is internally provided with a water spraying channel, an air spraying channel and a spraying channel; the inlet of the air injection channel is used for being connected with an air source, and the outlet of the air injection channel is communicated with the first inlet of the injection channel; the inlet of the water spraying channel is used for receiving a water source, and the outlet of the water spraying channel is communicated with the second inlet of the spraying channel so as to spray water into the spraying channel to mix water and air; the outlet of the injection channel is provided with an injection port;

a main control valve assembly for controlling opening or closing of the injection port for injecting a water-gas mixture.

2. The fuel injector of claim 1, wherein the position of the first inlet is located forward of the position of the second inlet in the direction of fuel flow in the injection passage; the circulating section of the front section pipe section at the position of the second inlet is arranged in a gradually-reduced mode, and the circulating section of the rear section pipe section at the position of the second inlet is arranged in a gradually-enlarged mode.

3. The fuel injector of claim 1, wherein the body extends in a direction of the injection passage such that a flow cross-section at which the injection passage is extended is smaller than a flow cross-section of the first inlet; the second inlet is located at an extended portion of the injection passage.

4. The fuel injector of claim 1, wherein the second inlet is located at a narrowest tube end of the injection passage.

5. The fuel injector of any of claims 2 to 4, wherein the water injection passage comprises a water inlet pipe section and a water homogenizing pipe section in communication with the injection passage;

the water homogenizing pipe section is provided with a water homogenizing part which is annularly arranged on the outer wall of the jet channel, and an annular cavity is arranged in the water homogenizing part; the second inlet comprises a plurality of water inlet holes which are annularly arranged, and the annular cavity is communicated with the injection channel through a plurality of water inlet holes.

6. The fuel injector of claim 5,

the water homogenizing pipe section also comprises a flow limiting pipe, one end of the flow limiting pipe is communicated with the water inlet pipe section, and the other end of the flow limiting pipe is communicated with the water homogenizing pipe section; the flow-through section corresponding to the flow limiting pipe is smaller than the flow-through section corresponding to the water inlet pipe section.

7. The fuel injector of claim 6, further comprising a water injection valve assembly;

the water spray valve component comprises a water spray needle valve, an elastic piece, an electromagnetic valve and an armature;

the water spray needle valve is fixedly connected with the armature and extends into the water spray channel; two ends of the elastic piece are respectively connected to the armature and the main body of one side of the armature, which is far away from the water spray needle valve, and the water spray needle valve blocks an outlet of the water spray channel under the elastic pressure of the elastic piece;

when the electromagnetic valve is electrified, the electromagnetic valve drives the armature to move so as to compress the elastic piece, so that the water spray needle valve opens the outlet of the water spray channel.

8. The fuel injector of claim 1,

the main control valve subassembly includes the main needle valve, the main needle valve sets up in the injection passage, the main needle valve is through following the injection passage removes to block up or open the export of injection passage.

9. A vehicle comprising an engine combustion chamber, an intake passage communicating with the engine combustion chamber, and the fuel injector of any one of claims 1 to 8;

the fuel injector is mounted on the engine combustion chamber to inject a water-gas mixture or a combustible gas into the engine gas cylinder; or

The fuel injector is installed on the intake passage to spray a water-gas mixture or a combustible gas into the intake passage.

10. A control method of a fuel injector applied to the fuel injector according to any one of claims 1 to 8, characterized by comprising:

acquiring load working condition parameters of a vehicle engine;

under the condition that the load working condition parameter is higher than a preset load threshold value, controlling the injection port to inject a water-gas mixture; and controlling the injection port to inject combustible gas under the condition that the load condition parameter is lower than or equal to the preset load threshold.