CN116733650A

CN116733650A - Fuel injector, control method thereof and vehicle

Info

Publication number: CN116733650A
Application number: CN202210205331.3A
Authority: CN
Inventors: 江枭枭; 杜家坤; 陈泓; 李钰怀; 罗亨波; 吴威龙
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: 2023-09-12

Abstract

The application provides a fuel injector, a control method thereof and a vehicle. A fuel injector comprising a main body and a water inlet part; the main body is internally provided with a fuel channel and a gas-water channel, and is provided with an oil spray hole and a water spray hole; the inlet of the fuel channel is used for connecting an oil supply system, and the outlet of the fuel channel is communicated with the oil spraying hole; the main body also comprises an oil injection valve assembly connected with the fuel channel, and the oil injection valve assembly is used for controlling the on-off of the fuel channel; the inlet of the air-water channel is used for connecting an air source, and the outlet of the air-water channel is communicated with the water spraying port; the water inlet part is arranged on the main body, a water spraying channel is formed in the water inlet part, one end of the water spraying channel is used for being connected with a water supply system, and the other end of the water spraying channel is communicated with the air-water channel so as to spray water into the air-water channel to mix gas and liquid; the water inlet part comprises a water spray valve component which is used for controlling the on-off of the water spray channel. The fuel injector of the scheme of the application has the functions of spraying water and injecting oil, and effectively meets the requirements of various complex working conditions of the engine.

Description

Fuel injector, control method thereof and vehicle

Technical Field

The application relates to the field of combustion control of vehicle engines, in particular to a fuel injector, a control method thereof and a vehicle.

Background

In the running process of the air vehicle engine, water is sprayed into the cylinder by adopting a water spraying technology. The evaporation and heat absorption of water can bring about the reduction of combustion temperature, and the time that the spontaneous combustion of the tail end gas mixture takes place can be prolonged effectively to the emergence of suppression knocking, the water spray brings about the reduction of temperature in the jar simultaneously and is favorable to slowing down the speed of generating nitrogen oxide, finally brings about the reduction of NOx emission.

The existing gasoline engine water spraying system is divided into two modes of oil-water separation direct water spraying and oil-water mixing direct water spraying according to whether fuel oil and water share one nozzle or not. The technology of directly spraying water by oil-water separation needs to be provided with additional water sprayers besides the oil sprayer, which can lead to the increase of the packaging volume of the cylinder cover and the increase of the complexity of the arrangement in the cylinder. For direct water spraying of oil-water mixture in a cylinder, although a new water sprayer is not needed to be additionally arranged, the technology adopted at present is that oil and water are premixed through an additional oil-water premixing device to form an oil-water mixture which is sent into an oil sprayer, the oil mixture is sprayed into a combustion chamber through the same channel in the oil sprayer, the corrosiveness of the high-pressure oil-water mixture and the severe environment of high temperature and high pressure in the combustion chamber all bring strict special requirements to the manufacturing process of the nozzle, and the additional oil-water premixing device also brings about cost increase.

The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the 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 that integrates both water injection and fuel injection functions.

In order to solve the technical problems, the application adopts the following technical scheme:

according to one aspect of the present application, there is provided a fuel injector comprising:

a main body in which a fuel passage and an air-water passage are formed, and in which an oil spray hole and a water spray hole are formed; the inlet of the fuel channel is used for being connected with an oil supply system, and the outlet of the fuel channel is communicated with the oil spraying hole; the main body also comprises an oil injection valve assembly connected with the fuel channel, and the oil injection valve assembly is used for controlling the on-off of the fuel channel; the inlet of the air-water channel is used for connecting an air source, and the outlet of the air-water channel is communicated with the water spraying port;

the water inlet part is arranged on the main body, a water spraying channel is formed in the water inlet part, one end of the water spraying channel is used for being connected with a water supply system, and the other end of the water spraying channel is communicated with the air-water channel so as to spray water into the air-water channel to mix gas and liquid; the water inlet part comprises a water spray valve assembly, and the water spray valve assembly is used for controlling the on-off of the water spray channel.

According to an embodiment of the application, the gas-water channel comprises a gas-liquid mixing pipe section, and a water spraying part is arranged at the inlet of the gas-liquid mixing pipe section; the water spraying part is communicated with an outlet of the water spraying channel;

the water spraying part is internally provided with an annular water homogenizing channel, the annular water homogenizing channel is annularly arranged along the circumferential direction of the gas-liquid mixing pipe section, the annular water homogenizing channel is communicated with the gas-liquid mixing pipe section, and water of the water spraying channel is uniformly sprayed into the gas-liquid mixing pipe section through the annular water homogenizing channel.

According to an embodiment of the present application, the air-water channel has a minimum flow cross section at a position corresponding to the water spraying portion.

According to an embodiment of the present application, the air-water channel includes tapered portions connected in sequence so as to gradually widen, the flow cross section of the tapered portions gradually decreases from front to back, and the flow cross section of the tapered portions gradually increases from front to back;

the flow cross section at the junction of the tapering portion and the widening portion is smallest.

According to an embodiment of the application, the main body is provided with an air inlet pipe and an air injection valve assembly;

an air injection channel is formed in the air inlet pipe, an inlet of the air injection channel is used for being connected with an air source, and an outlet of the air injection channel is communicated with an inlet of the air water channel;

the air injection valve assembly has an air gate positioned within the air injection passage that moves to block or open the outlet of the air injection passage.

According to an embodiment of the application, the air-water channel comprises an air pipe section; two ends of the gas pipe section are respectively communicated with the air injection channel and the inlet of the gas-liquid mixing pipe section;

the gas pipe section is provided with a gas homogenizing part, the gas homogenizing part is annularly arranged on the outer wall of the fuel channel, an annular cavity is arranged in the gas homogenizing part, and the annular cavity is communicated with the gas injection channel so as to uniformly output gas from the gas injection channel;

the gas-water channel pipe section behind the gas homogenizing part forms an annular air channel which is annularly arranged on the periphery of the fuel channel, and the annular air channel is the same as the extending direction of the fuel channel.

According to an embodiment of the application, an injection valve assembly is further arranged in the main body, and the injection valve assembly comprises an injection needle valve, a first elastic piece, a first electromagnetic valve and a first armature;

the fuel injection needle valve is fixedly connected with the first armature and extends into the fuel channel; the first elastic piece is sleeved on the fuel injection needle valve, two ends of the first elastic piece are respectively connected with the first electromagnetic valve and the first armature, and the fuel injection needle valve blocks an outlet of the fuel channel under the elastic pressure of the first elastic piece;

when the first solenoid valve is energized, the first solenoid valve compresses the first elastic member by driving the first armature to move, so that the fuel injection needle valve opens the outlet of the fuel passage.

According to one embodiment of the application, the water spray valve assembly comprises a water spray needle valve, a second elastic piece, a second electromagnetic valve and a second armature;

the water spraying needle valve is fixedly connected with the second armature and extends into the water spraying channel; the second elastic piece is sleeved on the water spraying needle valve, two ends of the second elastic piece are respectively connected with the second electromagnetic valve and the second armature, and the water spraying needle valve blocks an outlet of the water spraying channel under the elastic pressure of the second elastic piece;

and under the condition that the second electromagnetic valve is electrified, the second electromagnetic valve drives the second armature to move so as to compress the second elastic piece, so that the water spraying needle valve opens the outlet of the water spraying channel.

According to another aspect of the present application, a vehicle is provided, comprising an engine cylinder, an intake port communicating with the engine cylinder, and the fuel injector;

the fuel injector is arranged on the engine cylinder to inject and/or spray water into the engine cylinder; and/or

The fuel injector is mounted on the intake passage to inject and/or spray water into the intake passage.

According to another aspect of the present application, there is provided a control method of a fuel injector, applied to the fuel injector, the method comprising:

opening a water spray valve assembly and closing a fuel injection valve assembly to spray water to the fuel injector when the fuel injector enters a water spray mode; when the fuel injector enters a water spraying and oil spraying mode, the water spraying valve assembly and the oil spraying valve assembly are opened, so that the fuel injector sprays water and sprays oil.

The fuel injector of the scheme of the application integrates the functions of water spraying and oil injection, and the independent air-water channel and the independent fuel oil channel are arranged in one injector, so that the fuel oil channel and the air-water channel can be independently controlled, are not mutually influenced and flexibly switched, effectively meet the requirements of various complex working conditions of an engine, and fully exert the advantage of the water spraying technology on the combustion of the gasoline engine. The scheme of the application is beneficial to improving the structural compactness of the fuel injector, facilitating arrangement and reducing the great influence on the structure and the volume of the cylinder cover. The water spraying technology related to the scheme of the application is different from the direct water spraying of oil-water mixing in a cylinder, does not need an additional oil-water premixing device, and avoids the corrosion of an oil-water mixture to a pipeline.

In addition, the air-water channel in the scheme of the application is communicated with the water supply system and is used for an air source, so that an air-water mixture is formed in the air-water channel, and when the air-water mixture enters the cylinder, the situation that water is distributed on the cylinder wall is reduced, thereby effectively reducing the damage to a lubricating oil film of the cylinder wall and reducing the problems of engine oil emulsification and the like. And the uniformity of water in the gas-water mixture is improved, and the problem that the excessive concentration area of water in a cylinder is avoided, so that the adverse effect on combustion, the emission deterioration and the like are reduced.

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 as claimed.

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 longitudinal internal structural view of a fuel injector according to one embodiment.

FIG. 2 is a control method of a fuel injector according to an embodiment.

The reference numerals are explained as follows: 1. a main body; 11. a fuel passage; 12. a gas-water channel; 121. a gas pipe section; 122. a gas-liquid mixing pipe section; 13. a gas homogenizing part; 14. an oil injection hole; 15. a water spraying hole; 16 water spraying parts; 17. a taper; 18. a widening portion;

2. a water inlet part; 21. a water spray channel; 22. a water spray valve assembly; 221. a water spray needle valve; 222. a second elastic member; 223. a second electromagnetic valve; 224. a second armature; 225. a second valve seat;

31. an air inlet pipe; 311. a jet channel; 32. an air injection valve assembly; 321. a valve; 322. a third electromagnetic valve; 323. a third armature; 324. a third elastic member; 325. valve retainer.

4. An injection valve assembly; 41. a fuel injection needle valve; 42. a first elastic member; 43. a first electromagnetic valve; 44. a first armature; 45. a first valve seat.

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, 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.

Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the application, not to imply that each embodiment of the application must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the embodiment shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the application are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position 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. However, the exemplary embodiments may be embodied in many 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 the 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 a repetitive description thereof will be omitted.

Preferred embodiments of the present application will be further elaborated below with reference to the drawings of the present specification.

The application provides a fuel injector which can be used for injecting oil, water and both oil injection and water injection into an engine cylinder or an air inlet passage respectively. Referring specifically to FIG. 1, FIG. 1 is a longitudinal internal block diagram of a fuel injector according to one embodiment. In one embodiment, the fuel injector comprises a main body 1, a water inlet part 2, a fuel channel 11 and a gas-water channel 12 formed in the main body 1, and a gas spraying hole and a water spraying hole 15 formed on the main body 1; the inlet of the fuel channel 11 is used for connecting an oil supply system, and the outlet of the fuel channel 11 is communicated with the oil spraying hole 14; the inlet of the air-water channel 12 is used for connecting an air source, and the outlet of the air-water channel 12 is communicated with a water spray port; the water inlet part 2 is arranged on the main body 1, a water spraying channel 21 is formed in the water inlet part 2, one end of the water spraying channel 21 is used for being connected with a water supply system, and the other end of the water spraying channel is communicated with the air-water channel 12 so as to spray water into the air-water channel 12 to mix gas and liquid; the water inlet part 2 comprises a water spray valve assembly 22, and the water spray valve assembly 22 is used for controlling the on-off of the water spray channel 21.

The fuel injector of the scheme of the application integrates the functions of water spraying and oil injection, and the air-water channel 12 and the fuel channel 11 are independently arranged in one injector, so that the fuel channel 11 and the air-water channel 12 are independently controlled, are not mutually influenced and are flexibly switched, the requirements of various complex working conditions of the engine are effectively met, and the advantage of the water spraying technology on the combustion of the gasoline engine is fully exerted. The scheme of the application is beneficial to improving the structural compactness of the fuel injector, facilitating arrangement and reducing the great influence on the structure and the volume of the cylinder cover. The water spraying technology related to the scheme of the application is different from the direct water spraying of oil-water mixing in a cylinder, does not need an additional oil-water premixing device, and avoids the corrosion of an oil-water mixture to a pipeline.

In addition, the air-water channel 12 in the scheme of the application is communicated with the water supply system and is used for connecting with an air source, so that an air-water mixture is formed in the air-water channel 12, and when the air-water mixture enters the cylinder, the condition that water is distributed on the cylinder wall is reduced, thereby effectively reducing the damage to a lubricating oil film of the cylinder wall and reducing the problems of engine oil emulsification and the like. And the uniformity of water in the gas-water mixture is improved, and the problem that the excessive concentration area of water in a cylinder is avoided, so that the adverse effect on combustion, the emission deterioration and the like are reduced.

The main body 1 may be made of metal to improve structural rigidity. Illustratively, the main body 1 is substantially elongated, and here, the directions shown in the drawings are taken as examples, and two ends of the main body 1 are respectively a front end and a rear end. The fuel passage 11 and the air-water passage 12 each extend in the longitudinal direction of the main body 1. The oil jet hole 14 and the water jet hole 15 are provided at the rear end of the main body 1. The front end of the main body 1 is respectively provided with an interface for connecting an oil supply system, a water supply system and an air inlet system. The oil may be of the type gasoline, diesel, ethanol, etc. The gas entering the gas-water passage 12 may be air.

In one example, an oil inlet portion is outwardly protruded at one side of the front end of the main body 1, and an oil injection passage is formed in the oil inlet portion, one end of the oil injection passage is for receiving oil, and the other end is communicated with the fuel passage 11 and moves backward along the fuel passage 11 until being ejected from the oil injection hole 14. The oil jet 14 may be provided in plural numbers to improve the uniformity of injection.

In order to control the injection of oil, in one embodiment, an injection valve assembly 4 is further provided in the main body 1, the injection valve assembly 4 includes an injection needle 41, the injection needle 41 is provided in the fuel passage 11, and the injection needle 41 is moved along the fuel passage 11 to block or open an outlet of the fuel passage 11.

There are various ways to drive the injection needle 41, in one example, the injection valve assembly 4 further includes a first armature 44, a first elastic member 42, a first solenoid valve 43, and a first valve seat 45; the injection needle 41 is fixedly connected to the first armature 44 and extends into the injection channel, wherein the injection needle 41 can penetrate the first armature 44 in an embedding manner; the first elastic member 42 is sleeved on the fuel injection needle valve 41, two ends of the first elastic member 42 are respectively connected with the first electromagnetic valve 43 and the first armature 44, the fuel injection needle valve 41 blocks the outlet of the fuel channel 11 under the elastic pressure of the first elastic member 42, and at the moment, the fuel injection needle valve 41 is in sealing connection with the first valve seat 45 so as to prevent oil leakage; when the first solenoid valve 43 is energized, the first solenoid valve 43 drives the first armature 44 to move by magnetic attraction force to compress the first elastic member 42, so that the injection needle valve 41 opens the outlet of the fuel passage 11 to spray the oil. Here, the injection valve assembly 4 may be provided at the front end of the main body 1, and the injection needle valve 41 extends from the front end to the rear end.

In one embodiment, the main body 1 is provided with an air inlet pipe 31, and an air injection valve assembly 32; an air injection channel 311 is formed in the air inlet pipe 31, an inlet of the air injection channel 311 is used for connecting an air source, and an outlet of the air injection channel 311 is communicated with an inlet of the air water channel 12; the air injection valve assembly 32 has an air gate 321, the air gate 321 being located within the air injection channel 311 to block or open the outlet of the air injection channel 311 by moving.

Specifically, a socket of the intake pipe 31 may be provided at the forefront end of the main body 1, and the air jet valve assembly 32 is provided at the front side of the injection valve assembly 4. The air injection valve assembly 32 comprises a third armature 323, a third elastic member 324, a third electromagnetic valve 322, an air valve 321 and an air valve seat 325, wherein a cavity is formed between the air valve 321 and the air valve seat, and air output by the air injection channel 311 enters the air water channel 12 through the cavity. The valve 321 is fixedly connected with the third armature 323 through a valve shaft; the valve 321 communicates with the intake pipe 31 along the cavity. The valve shaft 325 is fixedly connected with the armature, two ends of the third elastic piece 324 are respectively connected with the third electromagnetic valve 322 and the third armature 323, the third armature 323 pushes the valve 321 under the elastic pressure of the third elastic piece 324 so as to close the air injection channel 311, and at the moment, the valve 321 and the valve seat ring 325 are tightly contacted in a pressing mode to ensure sealing; with the third solenoid valve 322 energized, the third solenoid valve 322 drives the third armature 323 to move by magnetic attraction force to pull the air valve 321, thereby opening the air injection passage 311. Here, the third elastic member 324 may be a spring or a leaf spring.

Since the fuel injection valve assembly 4 is arranged in the front part of the main body 1, the air-water channel 12 bypasses from the front end of the main body 1 to one side of the fuel injection valve assembly 4 and further extends backwards, so that local air density is high and uniform mixing with water is difficult to realize. Thus, in one embodiment, the gas-water channel 12 is provided to include a gas pipe segment 121 in communication with the gas injection channel 311; the gas pipe section 121 is provided with a gas homogenizing part 13, the gas homogenizing part 13 is annularly arranged on the outer wall of the fuel channel 11, an annular cavity is arranged in the gas homogenizing part 13, and the annular cavity is communicated with the gas spraying channel 311 so as to uniformly output gas from the gas spraying channel 311; the pipe section of the air-water passage 12 from the air-homogenizing portion 13 forms an annular air passage which is annularly provided at the outer periphery of the fuel passage 11, and is the same as the extending direction of the fuel passage 11.

Here, the air pipe section 121 is used to receive air taken in from the air intake pipe 31. The gas pipe section 121 may be divided into two sections by the gas homogenizing portion 13, and the front section is communicated with the air injection channel 311 and bypasses to one side of the oil injection valve assembly 4 to the front end of the main body 1, and then extends backwards until reaching the gas homogenizing portion 13. Because the gas homogenizing part 13 is internally provided with the annular cavity, the flow cross section of the gas is effectively enlarged, so that the gas density is reduced, and the uniformity of subsequent mixing with water is improved. From the gas homogenizing portion 13, the gas is allowed to flow along the annular gas passage. The fuel passage 11 may be provided coaxially with the annular gas passage, thereby further improving the uniformity of the distribution of the gas in the annular gas passage.

As can be seen from the foregoing embodiments, the fuel injector further includes a water spray valve assembly 22, and the water spray valve assembly 22 is used to control the opening and closing of the water spray channel 21. Specifically, the spray valve assembly 22 includes a second armature 224, a second resilient member 222, a second solenoid valve 223, and a third needle valve seat; the water spray needle valve 221 is fixedly connected with the second armature 224 and extends into the water spray channel 21, wherein the water spray needle valve 221 can penetrate through the second armature 224 in an embedded manner; the second elastic member 222 is sleeved on the water spraying needle valve 221, two ends of the second elastic member 222 are respectively connected with the second electromagnetic valve 223 and the second armature 224, the water spraying needle valve 221 blocks the outlet of the water spraying channel 21 under the elastic pressure of the second elastic member 222, and at the moment, the water spraying needle valve 221 is in sealing connection with the second valve seat 225 so as to prevent water leakage; when the second solenoid valve 223 is energized, the second solenoid valve 223 drives the second armature 224 to move by a magnetic attraction force to compress the second elastic member 222, so that the water spray needle valve 221 opens the outlet of the water spray passage 21 to spray water. Here, the second elastic member 222 may be a spring or a shrapnel.

Here, when the fuel injector needs to spray water, the spraying valve assembly 22 needs to open the water spraying passage 21 and the air injection valve assembly 32 needs to open the air injection passage 311 at the same time when the fuel injector needs to spray water.

Further, in an embodiment, the gas-water channel 12 further includes a gas-liquid mixing pipe section 122 connected to the outlet of the gas pipe section 121, and a water spraying portion 16 is disposed at the connection of the gas pipe section 121 and the gas-liquid mixing pipe section 122, where the water spraying portion 16 is communicated with the outlet of the water spraying channel 21; an annular water homogenizing channel is formed in the water spraying part 16, the annular water homogenizing channel is annularly arranged along the circumferential direction of the annular air channel, the annular water homogenizing channel is communicated with the annular air channel, and water of the water spraying channel 21 is uniformly sprayed into the gas-liquid mixing pipe section 122 through the annular water homogenizing channel.

As before, an annular air passage is formed in the gas-liquid passage following the air homogenizing portion 13, so by providing the water spraying portion 16 with the annular water homogenizing passage, water can be uniformly sprayed into the annular air passage in the circumferential direction of the annular air passage, thereby achieving uniform water-air mixing.

At present, the internal structure of the water sprayer adopted by the domestic and foreign water spraying technology cannot refine water drops, the atomization effect of the water is poor, no matter the technical scheme of air inlet channel injection or in-cylinder injection is adopted, the phenomenon that the water is distributed on a cylinder wall easily occurs when the water enters the cylinder, and therefore a lubricating oil film of the cylinder wall is damaged, and the problems of engine oil emulsification and the like are caused. When water is distributed in a large droplet shape in a cylinder, the non-uniformity of the distribution in the cylinder is large, and an over-concentration area of the water is easy to generate, so that the combustion is adversely affected, and the emission is deteriorated.

Based on this, in one embodiment of the present application, the minimum flow cross section is provided at the position of the air-water passage 12 corresponding to the water spraying portion 16. That is, after the water is ejected from the water ejection passage 21, the water is ejected from the narrowest position of the gas-water passage 12 into the gas-liquid mixing pipe section 122. By providing the narrowest point of the air-water passage 12, the air flow velocity can be greatly enhanced. After the water is ejected from the water spraying part 16, the water collides with the accelerated gas and is crushed into fine liquid drops, the fine liquid drops are wrapped by the gas flowing at high speed and move towards the direction of the gas flow, so that the water is kept in the state of the fine liquid drops and is sprayed into a combustion chamber or an air inlet channel through the water spraying holes 15, the water can be effectively atomized and evaporated, the diffusion of water mist in a cylinder is facilitated, the problems that the water flows into the combustion chamber in a large liquid drop shape or is directly sprayed into the cylinder wall in a large liquid drop shape to cause the emulsification of engine oil and the like due to the poor atomization can be solved, and the problems that the combustion is deteriorated due to the partial water concentration which is poor in the combustion chamber and the poor diffusion of the water can be effectively solved. When combustion occurs in the combustion chamber of the engine, the cooling effect of water can be fully exerted, the knocking tendency is reduced, the thermal efficiency of the engine is improved, the generation of emissions such as NOx is reduced, and a strategy of eliminating the enrichment and the cooling of fuel at high load becomes possible, so that the fuel economy and PN emission under high load working conditions are improved.

Here, the flowable section of the air-water passage 12 may be reduced by providing a projection in the air-water passage 12 at a position corresponding to the water spraying portion 16. In an embodiment, the air-water channel 12 includes a gradually-widened portion 18 connected in sequence with the gradually-widened portion 17, the flow cross section of the gradually-widened portion 17 gradually decreases from front to back, and the flow cross section of the gradually-widened portion 17 gradually increases from front to back; the junction of the tapering 17 and the widening 18 has a minimal flow cross section. The present embodiment can make the airflow velocity gradually increase when the airflow passes through the tapering portion 17, and gradually decrease when the airflow enters the tapering portion 17 after passing through the minimum flowable section, thereby being beneficial to improving the stability of the airflow. The tapering 17 may here be a cambered surface of the inner wall of the gas-water channel 12, which projects towards the centre of the gas channel. The widening 18 may be a concave arc surface shape of the inner wall surface of the gas-water passage 12 facing away from the center of the gas passage.

Here, the tapered portion 17 and the widened portion 18 may be provided in plural sets along the extending direction of the air-water passage 12, and one water spraying portion 16 is provided at the junction of each set of the tapered portion 17 and the widened portion 18. Thereby improving the uniformity of air-water mixing and the breaking degree of water drops.

The application also provides a vehicle, which comprises an engine cylinder, an air inlet channel communicated with the engine cylinder and a fuel injector; the fuel injector is arranged on the engine cylinder to inject and/or spray water into the engine cylinder; or a fuel injector is mounted on the intake passage to inject and/or spray water into the intake passage.

In particular, the fuel injection valve assembly 4, the air injection valve assembly 32 and the water injection valve assembly 22 in the fuel injector of the present application work independently and do not affect each other, so that the fuel injector of the present application can realize flexible control of injection and water injection. Through setting up a plurality of fuel injector to based on different arrangements, can realize that intake duct water spray combines in the jar and directly spout the gasoline mode, in jar directly spout gasoline and combine in jar and directly spout the water mode, intake duct and in jar double injection combine intake duct water spray mode, the combination of multiple functions such as intake duct and in jar double injection combine intake duct and in jar double injection water spray mode, can effectively be to the demand of engine complex operating mode, the advantage effect of full play water spray technique to petrol engine combustion.

In the scheme of the embodiment, the fuel injector can realize simultaneous injection and spraying in an oil-water separation mode, so that the additional arrangement of a sprayer in a cylinder or an air inlet channel is not needed, the volume of the engine is reduced, and the structural compactness of the engine is improved. For direct water spraying of oil-water mixture in a cylinder, although a new water sprayer is not needed to be additionally arranged, the technology adopted at present needs an additional oil-water premixing device to premix oil and water into an oil-water mixture to be sent into an oil sprayer, the oil-water mixture is sprayed into a combustion chamber through the same channel in the oil sprayer, the corrosiveness of the high-pressure oil-water mixture and the severe environment of high temperature and high pressure in the combustion chamber all put forward strict special requirements on the manufacturing process of the nozzle, and the additional oil-water premixing device also brings about cost increase. The scheme of the application effectively avoids arranging the oil-water premixing device, avoids the reduction of structure and performance stability caused by corrosiveness of an oil-water mixture, and saves cost.

Referring to FIG. 2, FIG. 2 illustrates a method of controlling a fuel injector according to one embodiment.

The application also provides a control method of the fuel injector, which is applied to the fuel injector in the embodiment. The specific structure and advantageous effects of the fuel injector in the above embodiments are not repeated here.

Specifically, the control method of the fuel injector includes:

s51, acquiring the operation condition of an engine;

s52, determining that the fuel injector enters a fuel injection mode and a water injection mode or simultaneously injects fuel and injects water according to the operation condition of the engine;

s53, when the fuel injector enters a water spraying mode, the water spraying valve assembly 22 is opened, and the oil spraying valve assembly 4 is closed, so that the fuel injector sprays water; when the fuel injector enters the water and oil spray mode, the water spray valve assembly 22 and the oil spray valve assembly 4 are opened to spray and spray the water and oil from the fuel injector.

The running condition of the engine at a certain moment is simply called working condition, specifically, ECU (Electronic Control Unit) electronic control unit) or the controller can be used for identifying the corresponding phase of the engine, and when the phase of the engine is detected to reach a certain specific position, the fuel injector is correspondingly determined to enter into a fuel injection mode and a water injection mode or simultaneously fuel injection and water injection modes. The solution of the application realizes independent water supply or oil supply into the cylinder or the air inlet channel by flexibly controlling the water spray valve assembly 22, the air spray valve assembly 32 and the oil injection valve assembly 4.

Still further, the fuel injector also has an air injection valve assembly 32 disposed within the air injection passage 311, and an oil injection valve assembly 4 disposed within the fuel passage 11; the method therefore comprises:

s51, acquiring the operation condition of an engine;

s53, when the fuel injector enters a water spraying mode, the water spraying valve assembly 22 and the air spraying valve assembly 32 are opened, and the fuel spraying valve assembly 4 is closed; when the fuel injector enters the injection mode, the injection valve assembly 4 is opened, and the spray valve assembly 22 and the injection valve assembly 32 are closed; when the fuel injector enters the simultaneous injection, injection mode, the injection valve assembly 22, the injection valve assembly 32, and the injection valve assembly 4 are opened.

While the application has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and 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:

2. The fuel injector of claim 1, wherein the gas-water passage includes a gas-liquid mixing pipe section, a water spraying portion being provided at an inlet of the gas-liquid mixing pipe section; the water spraying part is communicated with an outlet of the water spraying channel;

3. The fuel injector according to claim 2, wherein a flow cross section is smallest at a position on the air-water passage corresponding to the water spray portion.

4. A fuel injector as claimed in claim 3, wherein the gas-water passage includes tapered portions connected in sequence to taper, the flow cross section of the tapered portions gradually decreasing from front to back, and the flow cross section of the tapered portions gradually increasing from front to back;

5. The fuel injector of claim 2, wherein the body has an air inlet tube disposed thereon, and an air injection valve assembly;

6. The fuel injector of claim 5, wherein the gas-water passage comprises a gas pipe segment; two ends of the gas pipe section are respectively communicated with the air injection channel and the inlet of the gas-liquid mixing pipe section;

7. The fuel injector of claim 1, wherein the injection valve assembly comprises an injection needle valve, a first spring, a first solenoid valve, a first armature;

8. The fuel injector of claim 1, wherein the water spray valve assembly comprises a water spray needle valve, a second spring, a second solenoid valve, a second armature;

9. A vehicle comprising an engine cylinder, an intake port in communication with the engine cylinder, and at least one fuel injector as claimed in any one of claims 1 to 8;

10. A control method of a fuel injector, applied to the fuel injector as claimed in any one of claims 1 to 8; characterized in that the method comprises:

acquiring the operation condition of an engine;

controlling the fuel injector to enter a fuel injection mode, a water injection mode or a fuel injection and water injection mode according to the operation working condition of the engine;