阅读说明：本技术 一种射流点火燃烧系统的喷射方法及喷射控制方法 (Injection method and injection control method of jet ignition combustion system ) 是由 王志 赵自庆 李富柏 于 2019-10-22 设计创作，主要内容包括：本发明实施例提供一种射流点火燃烧系统的喷射方法及喷射控制方法,喷射方法包括：两次喷射的方法和单次喷射的方法。所述两次喷射的方法,包括：在发动机的进气冲程及压缩冲程中,控制系统分别触发射流室喷油器喷射燃料一次。单次喷射的方法包括：在发动机的进气冲程中,控制系统触发射流室喷油器喷射燃料一次。本发明实施例通过不同的喷射方法在射流室和主燃室之间创造分层的混合气,有利于发动机的可靠及稳定点火；通过对无喷射、单次喷射及两次喷射的喷射方法划分,充分考虑不同喷射方法适用范围及其优势,有利于拓展发动机在不同稀燃工况下的可靠运行,降低稀燃工况的循环波动,对于拓展发动机的稀燃运行具有极高的实用价值。(The embodiment of the invention provides an injection method and an injection control method of a jet ignition combustion system, wherein the injection method comprises the following steps: a two shot method and a single shot method. The two-injection method comprises the following steps: in the intake stroke and the compression stroke of the engine, the control system respectively triggers the jet flow chamber fuel injector to inject fuel once. The method of single injection includes: the control system triggers the jet chamber injector to inject fuel once during the intake stroke of the engine. According to the embodiment of the invention, the layered mixed gas is created between the jet flow chamber and the main combustion chamber by different injection methods, so that the reliable and stable ignition of the engine is facilitated; by dividing the injection methods of no injection, single injection and twice injection, the application ranges and the advantages of different injection methods are fully considered, the reliable operation of the engine under different lean-burn working conditions is favorably expanded, the cyclic fluctuation of the lean-burn working conditions is reduced, and the method has high practical value for expanding the lean-burn operation of the engine.)

1. A method of double injection for a jet ignition combustion system, comprising:

in the intake stroke and the compression stroke of the engine, the control system respectively triggers the jet flow chamber fuel injector to inject fuel once.

2. The method of double injection for a jet ignition combustion system of claim 1, further comprising:

during the intake stroke of the engine, the intake injector starts to inject fuel until the air-fuel mixture excess air coefficient of the main combustion chamber is within a first preset interval.

3. The method for injecting fuel twice in a jet ignition combustion system as claimed in claim 1, wherein the control system triggers the jet chamber injector to inject fuel once in the intake stroke and the compression stroke of the engine respectively, and the method comprises the following steps:

in the intake stroke of the engine, the control system triggers the jet flow chamber oil injector to inject fuel once, and the excess air coefficient of mixed gas at the periphery of the spray hole at the bottom of the jet flow igniter is within a second preset interval;

in the compression stroke of the engine, the control system triggers the jet flow chamber fuel injector to inject fuel once, and the excess air coefficient of the mixed gas in the jet flow chamber is within a third preset interval.

4. A method of single injection for a jet ignition combustion system, comprising:

the control system triggers the jet chamber injector to inject fuel once during the intake stroke of the engine.

5. The method for single injection of a jet ignition combustion system of claim 4, wherein the method for single injection of a jet ignition combustion system further comprises:

and in the intake stroke of the engine, starting to inject fuel by the intake injector until the air-fuel mixture excess air coefficient of the main combustion chamber is in a fourth preset interval.

6. The method for single injection of the jet ignition combustion system as claimed in claim 4, wherein the control system triggers the jet chamber injector to inject fuel once during an intake stroke of the engine, comprising:

in the intake stroke of the engine, the control system triggers the jet flow chamber fuel injector to inject fuel once, and the excess air coefficient of mixed gas at the periphery of a jet hole at the bottom of the jet flow chamber fuel injector and in the jet flow chamber is within a fifth preset interval.

7. A method for controlling single injection, double injection and no injection is characterized by comprising the following steps:

when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is within a sixth preset interval, the jet flow chamber oil sprayer does not spray;

when the excess air coefficient of mixed gas in the main combustion chamber of the engine is in a seventh preset interval and when the load of the engine is smaller than a rated load threshold value, the jet chamber oil sprayer performs single injection;

when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is in a seventh preset interval and when the load of the engine is greater than or equal to the rated load threshold value, the jet chamber oil sprayer performs two-time injection;

and when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is in an eighth preset interval, the jet chamber oil sprayer sprays twice.

8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the method for two injections by a jet ignition combustion system as defined in any one of claims 1 to 3, the steps of the method for a single injection by a jet ignition combustion system as defined in any one of claims 4 to 6 and the steps of the method for controlling a single injection, two injections and no injection as defined in claim 7.

9. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the method for two-injection in a jet-ignited combustion system according to any one of claims 1 to 3, the steps of the method for a single-injection in a jet-ignited combustion system according to any one of claims 4 to 6 and the steps of the method for single-injection, two-injection and no-injection control according to claim 7.

Technical Field

The invention relates to the technical field of ignition combustion devices of engines, in particular to an injection method and an injection control method of a jet ignition combustion system.

Background

The increasing prominence of energy and environmental problems promotes the continuous transformation and upgrading of the internal combustion engine technology. In conjunction with the prevailing trend of future hybrid power, vehicular power internal combustion engines may operate in a more concentrated, efficient region. In order to achieve higher thermal efficiency of the internal combustion engine, lean burn is the main technical path for improving the thermal efficiency of the internal combustion engine.

At present, the ignition of the traditional spark plug is difficult to realize stable ignition under the condition of high turbulence and ultra-lean mixture due to insufficient ignition energy.

Therefore, how to increase the ignition energy and make the spark plug realize stable ignition under the condition of high turbulence and ultra-lean mixture becomes a technical problem to be solved urgently.

Disclosure of Invention

The embodiment of the invention provides an injection method and an injection control method of a jet ignition combustion system, which are used for solving the technical problem that stable ignition is difficult to realize under the conditions of high turbulence and ultra-lean mixed gas due to insufficient ignition energy in the traditional spark plug ignition.

The embodiment of the invention provides a method for carrying out two-time injection on a jet ignition combustion system, which comprises the following steps:

in the intake stroke and the compression stroke of the engine, the control system respectively triggers the jet flow chamber fuel injector to inject fuel once.

Optionally, the method for performing two injections by the jet ignition combustion system further includes:

during the intake stroke of the engine, the intake injector starts to inject fuel until the air-fuel mixture excess air coefficient of the main combustion chamber is within a first preset interval.

Optionally, the control system may trigger the jet chamber injector to inject the fuel once in the intake stroke and the compression stroke of the engine respectively, and the control system may include:

in the intake stroke of the engine, the control system triggers the jet flow chamber oil injector to inject fuel once, and the excess air coefficient of mixed gas at the periphery of the spray hole at the bottom of the jet flow igniter is within a second preset interval;

in the compression stroke of the engine, the control system triggers the jet flow chamber fuel injector to inject fuel once, and the excess air coefficient of the mixed gas in the jet flow chamber is within a third preset interval.

The embodiment of the invention provides a method for carrying out single injection on a jet ignition combustion system, which comprises the following steps: the control system triggers the jet chamber injector to inject fuel once during the intake stroke of the engine.

Optionally, the method for single injection of the jet ignition combustion system further comprises:

and in the intake stroke of the engine, starting to inject fuel by the intake injector until the air-fuel mixture excess air coefficient of the main combustion chamber is in a fourth preset interval.

Optionally, the control system triggers the jet chamber injector to inject fuel once during an intake stroke of the engine, and comprises:

in the intake stroke of the engine, the control system triggers the jet flow chamber oil injector to inject fuel once, and the excess air coefficient of mixed gas at the periphery of a jet hole at the bottom of the jet flow igniter and in the jet flow chamber is within a fifth preset interval.

The embodiment of the invention provides a control method for single injection, double injection and no injection, which comprises the following steps:

when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is within a sixth preset interval, the jet flow chamber oil sprayer does not spray;

when the excess air coefficient of mixed gas in the main combustion chamber of the engine is in a seventh preset interval and when the load of the engine is smaller than a rated load threshold value, the jet chamber oil sprayer performs single injection;

when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is in a seventh preset interval and when the load of the engine is greater than or equal to the rated load threshold value, the jet chamber oil sprayer performs two-time injection;

and when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is in an eighth preset interval, the jet chamber oil sprayer sprays twice.

An embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the steps of the method.

Embodiments of the present invention provide a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the above-described method.

The embodiment of the invention creates layered mixed gas between the jet flow chamber and the main combustion chamber by different injection methods, thereby being beneficial to the reliable and stable ignition of the jet flow igniter; by dividing the injection methods of no injection, single injection and twice injection, the application ranges and the advantages of different injection methods are fully considered, the reliable operation of the engine under different lean-burn working conditions is favorably expanded, the cyclic fluctuation of the lean-burn working conditions is reduced, and the method has high practical value for expanding the lean-burn operation of the engine.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating a jet ignition combustion system according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart illustrating a method for performing two injections in a jet ignition combustion system according to an embodiment of the present invention;

FIG. 3 illustrates a schematic injection phase diagram provided by an embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating a method for single injection in a jet ignition combustion system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a single injection, double injection, and no injection control method according to an embodiment of the present invention;

fig. 6 is a logic block diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a schematic structural diagram of a jet ignition combustion system, as shown in fig. 1. The structure schematic diagram comprises: the fuel injection device comprises a fuel tank 1, an engine 2, an air inlet fuel injector 3, a jet igniter 4, a spark plug 5, a jet chamber fuel injector 6, a jet chamber 7, a jet hole peripheral area 8, a main combustion chamber 9 and a jet hole 10. The oil tank 1 is respectively connected with the air inlet oil injector 3 and the jet flow chamber oil injector 6 and is used for providing fuel for the air inlet oil injector 3 and the jet flow chamber oil injector 6; the air inlet fuel injector 3 is installed on an air inlet pipeline of the engine 2; wherein the intake injector 3 is used for injection in an intake stroke of the engine 2; the jet flow igniter 4 is installed on the top of a cylinder head of the engine 2, and the jet flow igniter 4 integrates a spark plug 5, an oil injector 6 and a jet flow chamber 7 to realize ignition. The bottom of the jet chamber 7 is provided with a plurality of jet holes 10 which are connected with a jet hole peripheral area 8; wherein, the plurality of jet holes 10 are used for jetting the combustion jet flow to the jet hole peripheral area 8; the main combustion chamber 9 is connected with the jet orifice peripheral area 8; wherein the main combustion chamber 9 is used for combusting a lean mixture. Wherein, the spark plug 5 ignites the fuel injected by the jet flow chamber injector 6 to realize combustion jet flow. It should be noted here that the intake air fuel injector 3 is a low-pressure fuel injector; the jet chamber injector 6 is a high pressure injector.

It should be noted that, in the present invention, the first, second, and … eighth preset sections of the first preset section, the second preset section, …, and the eighth preset section are only partitions of the preset sections, and do not represent a sequential relationship.

The above is a description of a jet ignition combustion system. The following is a description of a method of performing two injections and a single injection for a jet ignition combustion system.

Fig. 2 is a schematic flow chart illustrating a method for performing two injections in a jet ignition combustion system according to an embodiment of the present invention, including:

and S21, the control system triggers the jet flow chamber injector to inject fuel once in the intake stroke and the compression stroke of the engine respectively.

In the present embodiment, the jet chamber injector 6 injects the fuel twice in total. The first time is that the control system triggers the jet flow chamber fuel injector 6 to inject fuel once in the intake stroke of the engine; the second time is that the control system triggers the jet chamber injector 6 to inject fuel once during the compression stroke of the engine. A schematic diagram of the two-injection fuel is shown in fig. 3.

The fuel is injected twice by the jet flow chamber fuel injector in the embodiment of the invention, so that a foundation is laid for subsequently creating a three-level layered mixed gas atmosphere, and the reliable ignition of a jet flow ignition combustion system is realized.

Further, on the basis of the above method embodiment, the method for performing two injections by the jet ignition combustion system further includes:

during the intake stroke of the engine, the intake injector 3 starts injecting fuel until the mixture air excess coefficient of the main combustion chamber 9 is within a first preset interval.

Specifically, during the intake stroke of the engine, the intake injector 3 starts to inject fuel, creating a lean mixture atmosphere in the main combustion chamber 9 of the engine until the mixture excess air ratio of the main combustion chamber 9 is within a first preset interval. In the embodiment of the present invention, the first preset interval is 1.4 to 4, that is, the excess air ratio of the mixture in the main combustion chamber 9 is 1.4 to 4.

The air inlet fuel injector provided by the embodiment of the invention is used for injecting fuel, lays a foundation for subsequently creating a three-level layered mixed gas atmosphere, and is beneficial to realizing reliable ignition of a jet ignition combustion system.

Further, on the basis of the above embodiment of the method, the control system triggers the jet chamber injector to inject fuel once in the intake stroke and the compression stroke of the engine respectively, and the method includes:

in the intake stroke of the engine, the control system triggers the jet flow chamber oil injector to inject fuel once, and the excess air coefficient of mixed gas at the periphery of the spray hole at the bottom of the jet flow igniter is within a second preset interval;

in the compression stroke of the engine, the control system triggers the jet flow chamber fuel injector to inject fuel once, and the excess air coefficient of the mixed gas in the jet flow chamber is within a third preset interval.

Specifically, in the intake stroke of the engine, the fuel injected by the jet flow chamber injector 6 descends along with the piston and enters the main combustion chamber 9 of the engine through a jet flow igniter bottom spray hole 10, and the jet flow chamber spray hole peripheral area 8 is further enriched on the basis of lean mixture gas in the main combustion chamber 9. In the embodiment of the invention, the value of the second preset interval is 1 to 1.4, that is, the excess air coefficient of the mixed gas in the peripheral area 8 of the jet hole of the jet chamber is 1 to 1.4; during the compression stroke of the engine, the fuel injected by the jet chamber injector 6 further enriches the mixture inside the jet chamber 7. In the embodiment of the present invention, the third predetermined interval is 0.4 to 1, that is, the air mixture excess air coefficient of the jet chamber 7 is 0.4 to 1.

The injection of the intake oil injector 3 and the injection of the jet flow chamber oil injector 6 create a three-level layered mixed gas atmosphere between the main combustion chamber 9 and the jet flow chamber 7 of the engine, which are respectively as follows: firstly, the excess air coefficient of the mixed gas in the main combustion chamber 9 is between 1.4 and 4, and the mixed gas is lean mixed gas; secondly, the mixed gas excess air coefficient of the jet hole peripheral area 8 of the jet chamber is between 1 and 1.4; thirdly, the mixed gas inside the jet flow chamber 7 has the excess air coefficient of 0.4-1 and is rich mixed gas.

The embodiment of the invention is beneficial to the reliable and stable ignition of the jet flow igniter by creating a three-level layered mixed gas atmosphere between the jet flow chamber and the main combustion chamber.

Fig. 4 shows a schematic flow chart of a method for performing a single injection by using a jet ignition combustion system according to an embodiment of the present invention, including:

s41, the control system triggers the jet chamber injector to inject fuel once during the intake stroke of the engine.

In the embodiment of the invention, the jet chamber injector 6 injects fuel once in total. This injection is accomplished by the control system triggering the jet chamber injector 6 during the intake stroke of the engine. A schematic diagram of a single injection of fuel is shown in fig. 3.

The fuel is injected by the jet flow chamber fuel injector once, so that a foundation is laid for creating a two-stage layered mixed gas atmosphere subsequently, and reliable ignition of a jet flow ignition combustion system is realized.

Further, on the basis of the above method embodiment, the method for single injection by the jet ignition combustion system further includes:

and in the intake stroke of the engine, starting to inject fuel by the intake injector until the air-fuel mixture excess air coefficient of the main combustion chamber is in a fourth preset interval.

Specifically, during the intake stroke of the engine, the intake injector 3 starts to inject fuel, creating a lean mixture atmosphere in the main combustion chamber 9 of the engine, and the mixture excess air ratio of the main combustion chamber 9 is within the fourth preset range. In the embodiment of the present invention, the value of the fourth preset interval is 1.2 to 1.8, that is, the excess air coefficient of the mixture in the main combustion chamber 9 is 1.2 to 1.8.

The air inlet fuel injector of the embodiment of the invention injects fuel, lays a foundation for subsequently creating a two-stage layered mixed gas atmosphere, and is beneficial to realizing reliable ignition of a jet ignition combustion system.

Further, on the basis of the above method embodiment, the control system may trigger the jet chamber injector to inject the fuel once during an intake stroke of the engine, and the method may include:

in the intake stroke of the engine, the control system triggers the jet flow chamber oil injector to inject fuel once, and the excess air coefficient of mixed gas at the periphery of a jet hole at the bottom of the jet flow igniter and in the jet flow chamber is within a fifth preset interval.

Specifically, during the intake stroke of the engine, the jet chamber injector 6 is triggered by the control system to inject fuel once, so that the mixture excess air coefficient at the periphery 8 of the bottom spray hole of the jet igniter and in the jet chamber 7 is within a fifth preset interval. In the embodiment of the present invention, the value of the fifth preset interval is 0.8 to 1.2, that is, the excess air coefficient of the mixture at the periphery 8 of the bottom nozzle hole of the fluidic igniter and inside the fluidic chamber 7 is 0.8 to 1.2.

The single injection method creates a two-stage mixed gas atmosphere between the main combustion chamber 9 and the jet flow chamber 7 of the engine, which respectively comprises the following steps: firstly, the excess air coefficient of mixed gas in the main combustion chamber 9 is 1.2-1.8, and the mixed gas is lean mixed gas; secondly, the excess air coefficient of the mixed gas in the jet flow chamber 7 and the peripheral area 8 of the jet hole of the jet flow chamber is 0.8-1.2, and the mixed gas is rich mixed gas.

The embodiment of the invention is beneficial to the reliable and stable ignition of the jet flow igniter by creating two-stage mixed gas atmosphere between the jet flow chamber and the main combustion chamber.

The embodiment of the invention is beneficial to the reliable and stable ignition of the engine by creating the layered mixed gas between the jet flow chamber and the main combustion chamber.

The above is a description of a method for performing two injections and a single injection for a jet ignition combustion system, followed by a description of a control method for a single injection, two injections, and no injection.

Fig. 5 is a schematic diagram illustrating a single injection, two injections, and a control method without injection according to an embodiment of the present invention, including:

when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is within a sixth preset interval, the jet flow chamber oil sprayer does not spray;

when the excess air coefficient of mixed gas in the main combustion chamber of the engine is in a seventh preset interval and when the load of the engine is smaller than a rated load threshold value, the jet chamber oil sprayer performs single injection;

when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is in a seventh preset interval and when the load of the engine is greater than or equal to the rated load threshold value, the jet chamber oil sprayer performs two-time injection;

and when the excess air coefficient of the mixed gas in the main combustion chamber of the engine is in an eighth preset interval, the jet chamber oil sprayer sprays twice.

Specifically, in the embodiment of the present invention, the value of the sixth preset interval is 1 to 1.2; the value of the seventh preset interval is 1.2 to 1.6; the value of the eighth preset interval is more than 1.6. When the excess air ratio of the mixed gas in the main combustion chamber 9 of the engine is between 1 and 1.2, the jet flow chamber oil injector 6 does not inject; when the excess air ratio of the mixed gas in the main combustion chamber 9 of the engine is between 1.2 and 1.6, and when the load of the engine is less than 50 percent of the rated load, the jet flow chamber oil injector 6 performs one-time injection, and when the load of the engine is more than or equal to 50 percent of the rated load, the jet flow chamber oil injector 6 performs two-time injection; and when the mixed gas excess air coefficient of the engine main combustion chamber 9 is larger than 1.6, the jet flow chamber fuel injector 6 performs two times of injection.

According to the embodiment of the invention, the injection methods of no injection, single injection and twice injection are divided, the application ranges and the advantages of different injection methods are fully considered, the reliable operation of the engine under different lean combustion working conditions is favorably expanded, the cyclic fluctuation of the lean combustion working conditions is reduced, and the method has high practical value for expanding the lean combustion operation of the engine.

FIG. 6 is a logic block diagram of an electronic device according to an embodiment of the invention; the electronic device includes: a processor (processor)61, a memory (memory)62, and a bus 63;

wherein, the processor 61 and the memory 62 complete the communication with each other through the bus 63; the processor 61 is configured to call the program instructions in the memory 62 to execute the method for performing two-time injection by using the jet ignition combustion system, the method for performing single-time injection by using the jet ignition combustion system, and the control method for single-time injection, two-time injection, and no-injection provided by the above method embodiments.

An embodiment of the present invention further provides a non-transitory computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements a method for performing two injections by a jet ignition combustion system, a method for performing a single injection by a jet ignition combustion system, and a control method for a single injection, two injections, and no injection, which are provided in the foregoing embodiments.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.