Combined air inlet two-stage combustion six-stroke engine

Abstract

The invention discloses a combined air inlet two-stage combustion six-stroke engine, and relates to the field of power energy. In order to overcome the defects that in the prior art, a six-stroke engine is insufficient in gas inlet in the secondary combustion stage, poor in oil-gas mixing quality and low in combustion efficiency, according to the technical scheme, the six-stroke engine comprises a combustion chamber assembly, a fuel injector, a transmission mechanism and a gas distribution mechanism; the gas distribution mechanism comprises a gas inlet pipeline, an exhaust pipeline, a gas storage cavity, a gas inlet pipeline valve, a scavenging duct and a scavenging duct one-way valve, the working cycle of the engine comprises two times of gas inlet and two times of oil injection combustion acting, and the gas storage cavity releases gas to supplement fresh air in the combustion chamber in the second time of gas inlet. The combustion chamber assembly comprises a cylinder, a piston and a cylinder cover, the piston reciprocates in the cylinder, and the cylinder and the cylinder cover are closed to form a combustion chamber. The invention is suitable for improving the heat efficiency and output performance of the engine, especially for an internal combustion engine power system requiring multiple combustion work.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power energy, in particular to a combined intake two-stage combustion six-stroke engine. BACKGROUND

[0002] With the wide application of internal combustion power systems in automobiles, ships, power generation equipment, etc., engine technology has become an important research direction to promote the improvement of energy utilization efficiency and the control of pollution emissions. The traditional four-stroke engine is still one of the most widely used engine types due to its mature structure and low cost. Its basic working process includes four strokes of intake, compression, combustion (work) and exhaust, and only one work stroke in one working cycle, and the remaining three strokes are auxiliary processes and do not participate in energy output. Due to the low work frequency and the difficulty in fully utilizing the heat energy after combustion, the four-stroke engine has low thermal efficiency and insufficient fuel utilization.

[0003] To improve the efficiency of the engine, researchers have proposed the concept of six-stroke engine. This type of engine extends the working cycle and designs two combustion and two work processes in one cycle to improve combustion efficiency and power density. For example, some studies propose to add two auxiliary strokes, such as water injection cooling stroke or air cleaning stroke, based on the four-stroke engine to enhance heat exchange and exhaust efficiency. However, such schemes generally have complex system structure, difficulty in air intake organization, and dependence on external supply of auxiliary air source.

[0004] Another technical route is to use "secondary combustion" method, which performs two fuel injections and combustion in one working cycle to improve heat energy utilization. However, due to the lack of optimization of the structure of the traditional intake and exhaust system, the supply of fresh air required by secondary combustion cannot be guaranteed, and the insufficient air intake and lean mixture often lead to insufficient combustion, ultimately affecting the work performance and emission indicators of the engine.

[0005] In summary, the existing technology has the defects of insufficient air intake, poor oil-gas mixing quality and low combustion efficiency in the secondary combustion stage of the six-stroke engine. SUMMARY

[0006] To solve the defects of insufficient air intake, poor oil-gas mixing quality and low combustion efficiency in the secondary combustion stage of the six-stroke engine in the prior art, the technical solution provided by the present application is as follows: A combined intake two-stage combustion six-stroke engine, comprising: a combustion chamber assembly, an oil injector, a transmission mechanism and a valve train, the valve train comprising an intake pipe, an exhaust pipe, a gas storage cavity, an intake pipe valve, a scavenging passage and a one-way valve of the scavenging passage, the engine working cycle comprising two intakes and two oil injection combustion work, the second intake being supplemented by the gas released from the gas storage cavity to the fresh air in the combustion chamber.

[0007] Further, in a preferred embodiment, the combustion chamber assembly comprises a cylinder, a piston reciprocating in the cylinder, and a cylinder head enclosing the cylinder with the cylinder head.

[0008] Further, in a preferred embodiment, the fuel injector is arranged at the center of the cylinder head for injecting fuel into the combustion chamber before each of the two combustion events.

[0009] Further, in a preferred embodiment, the transmission mechanism comprises a connecting rod, a crank, a crank pin, a crank shaft, and a piston pin for converting the reciprocating motion of the piston into the rotating motion of the crank shaft.

[0010] Further, in a preferred embodiment, the gas storage cavity is arranged on the intake duct, and the intake duct valve is arranged at the front end of the gas storage cavity for controlling the communication between the gas storage cavity and the outside.

[0011] Further, in a preferred embodiment, the scavenging duct is arranged at the lower part of the cylinder and communicates with the combustion chamber, and the scavenging duct one-way valve is arranged between the scavenging duct and the combustion chamber for allowing gas to flow from the scavenging duct into the combustion chamber only.

[0012] A control method of the combined intake two-stage combustion six-stroke engine is also provided, based on the engine implementation, comprising: the step of closing the intake valve, triggering the first fuel injection, and performing the first combustion work; the step of opening the exhaust valve and the scavenging duct one-way valve to complete the exhaust and scavenging; the step of opening the intake valve and closing the intake duct valve to release the gas in the gas storage cavity and complete the air charge; the step of closing the intake valve, triggering the second fuel injection, and completing the second combustion work after compression; the step of opening the exhaust valve to complete the second exhaust.

[0013] A computer storage medium for storing a computer program is also provided, and when the computer program is read by a computer, the computer executes the method.

[0014] A computer comprising a processor and a storage medium is also provided, and when the processor reads the computer program stored in the storage medium, the computer executes the method.

[0015] A computer program product as a computer program is also provided, and when the computer program is executed, the method is implemented.

[0016] Compared with the prior art, the technical solution provided by the present application has the following advantages: By setting the air storage cavity and intake pipeline valve in the intake system, the timing control between the combustion chamber and the external air source is realized, so that part of the high-temperature and high-pressure air is stored in the air storage cavity in the previous stroke and is released in a directional manner to supplement the intake air before the second compression. Compared with the prior art which only relies on natural aspiration or a single intake path, the structure can effectively improve the mixture concentration before the second combustion, improve the oil-gas mixing quality, and thus enhance the combustion efficiency and stability of the secondary combustion.

[0017] The scavenging passage is arranged at the lower part of the cylinder, and the low-pressure auxiliary intake channel is formed by cooperating with the one-way valve, and the non-driven scavenging intake is realized by means of the negative pressure difference formed in the exhaust process. Unlike the mechanical auxiliary intake or external air pump in the prior art, the method has simple structure and fast response, can quickly introduce fresh air while the exhaust gas is discharged, effectively reduces the exhaust gas residue, and improves the gas purity and the efficiency of the secondary combustion.

[0018] The six-stroke two-combustion cycle is adopted, each combustion is carried out in a closed state, and the independent and orderly gas distribution process is ensured, so that both combustion strokes have a high starting pressure and temperature. Compared with the traditional four-stroke engine and the six-stroke technology which fails to ensure the conditions of the secondary combustion, the scheme significantly improves the effective output power generated by unit fuel, significantly improves the overall thermal efficiency, and has stronger power output capacity and energy-saving potential.

[0019] By combining the gas distribution system, the multi-path intake and orderly gas distribution control are realized without significantly increasing the structural complexity. Compared with the introduction of complex auxiliary air path or external air storage equipment in some six-stroke engine designs, the scheme utilizes the energy state difference in the engine operation process to form a pressure difference intake, reduces the system energy consumption and component wear, and enhances the engineering feasibility and stability of the structure.

[0020] It is suitable for improving the thermal efficiency and output performance of the engine, especially for the internal combustion engine power system which needs multiple combustion work. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a combined intake two-stage combustion six-stroke engine.

[0022] Figure 2 It is a cycle flow chart of the combined intake two-stage combustion method.

[0023] Reference signs: 1-piston; 2-cylinder; 3-cylinder head; 4-combustion chamber; 5-injector; 6-connecting rod; 7-crank; 8-crank pin; 9-crankshaft; 10-piston pin; 11-intake duct; 12-exhaust duct; 13-intake valve; 14-exhaust valve; 15-gas storage chamber; 16-intake duct valve; 17-scavenging duct; 18-scavenging duct one-way valve; a-top dead center; b-bottom dead center. DETAILED DESCRIPTION

[0024] In order to make the advantages and beneficial effects of the technical solutions provided by the present application more clear, the technical solutions provided by the present application are further described in detail below in combination with the drawings, and the specific embodiments are as follows: Embodiment one, the embodiment provides a two-stage combustion six-stroke engine with combined intake, comprising: a combustion chamber assembly, an injector, a transmission mechanism and a valve train, the valve train comprising an intake duct, an exhaust duct, a gas storage chamber, an intake duct valve, a scavenging duct and a scavenging duct one-way valve, the engine working cycle comprising two intakes and two fuel injections for combustion and work, the second intake being supplemented by the gas released from the gas storage chamber to the fresh air in the combustion chamber.

[0025] The combustion chamber assembly comprises a cylinder, a piston and a cylinder head, the piston reciprocating in the cylinder, the cylinder and the cylinder head being closed to form a combustion chamber.

[0026] The injector is arranged at the center of the cylinder head and used to inject fuel into the combustion chamber before each combustion.

[0027] The transmission mechanism comprises a connecting rod, a crank, a crank pin, a crankshaft and a piston pin, and is used to convert the reciprocating motion of the piston into the rotary motion of the crankshaft.

[0028] The gas storage chamber is arranged on the intake duct, and the intake duct valve is arranged at the front end of the gas storage chamber and used to control the communication between the gas storage chamber and the outside.

[0029] The scavenging duct is arranged at the lower part of the cylinder and communicates with the combustion chamber, and the scavenging duct one-way valve is arranged between the scavenging duct and the combustion chamber and only allows gas to enter the combustion chamber from the scavenging duct.

[0030] A control method of a two-stage combustion six-stroke engine with combined intake is also provided, based on the engine implementation, comprising: the step of closing the intake valve, triggering the first fuel injection and performing the combustion work; the step of opening the exhaust valve and the scavenging duct one-way valve to complete the exhaust and scavenging; the step of opening the intake valve and closing the intake duct valve to release the gas in the gas storage chamber and complete the air supplement; the step of closing the intake valve, compressing, triggering the second fuel injection and completing the second combustion work; The step of opening the exhaust valve to complete the second exhaust.

[0031] Embodiment two, this embodiment is to provide a further detailed description of the technical solutions of embodiment one, specifically: Referring to Figure 1 As shown in the figure, the engine structure of the present application mainly includes a combustion chamber assembly, an oil injector, a transmission mechanism and a valve train.

[0032] The combustion chamber assembly includes a piston 1, a cylinder 2 and a cylinder head 3. The piston 1 reciprocates up and down in the cylinder 2, and the piston center line coincides with the cylinder center line. The cylinder head 3 is fixedly connected with the cylinder 2 to form a sealed space, and its lower end surface, together with the upper end surface of the piston and the inner wall surface of the cylinder, constitutes a combustion chamber 4.

[0033] The oil injector 5 is arranged at the center position of the cylinder head 3, and is used to realize twice quantitative oil injection to provide fuel for two-stage combustion.

[0034] The transmission mechanism includes a connecting rod 6, a crank 7, a crank pin 8, a crankshaft 9 and a piston pin 10. The connecting rod 6 is connected with the crank 7 through the crank pin 8, the crank 7 is fixed on the crankshaft 9, and the reciprocating motion of the piston 1 is converted into the rotary motion of the crankshaft 9. The piston pin 10 is used to connect the connecting rod 6 and the piston 1.

[0035] The valve train includes an intake pipe 11, an exhaust pipe 12, an intake valve 13, an exhaust valve 14, a gas storage chamber 15, an intake pipe valve 16, a scavenging passage 17 and a scavenging passage one-way valve 18. The intake pipe 11 and the exhaust pipe 12 are arranged on the cylinder head 3, respectively located on both sides of the oil injector 5, and are in communication with the combustion chamber 4. The intake valve 13 and the exhaust valve 14 control the opening and closing of the combustion chamber 4 and the intake and exhaust passages, respectively.

[0036] The gas storage chamber 15 is arranged in the middle of the intake pipe 11 and is used to temporarily store part of the high-pressure gas; the intake pipe valve 16 is located upstream of the gas storage chamber 15 and is used to control the communication relationship between the gas storage chamber 15 and the external atmosphere. The scavenging passage 17 is opened in the lower part of the cylinder 2 and is in communication with the combustion chamber 4 through the scavenging passage one-way valve 18, which only allows gas to flow from the scavenging passage 17 into the combustion chamber 4 and prevents reverse flow.

[0037] Referring to Figure 2 As shown in the figure, the engine working process is composed of the following six strokes: The first stroke is the intake stroke, the piston 1 is at the top dead center a, the intake valve 13 and the intake pipe valve 16 are opened, the exhaust valve 14 and the scavenging passage one-way valve 18 remain closed, the piston 1 descends, the external fresh air enters the combustion chamber 4 through the intake pipe 11, and after reaching the bottom dead center b, the intake pipe valve 16 is closed to complete the intake.

[0038] The second stroke is compression stroke, the piston 1 goes up, the intake valve 13 is closed, at this time the combustion chamber 4 is a closed space, and the high-pressure gas in the rear part of the intake pipe is sealed in the air storage cavity 15. The piston compresses the air in the combustion chamber 4 to the top dead center a, and the compression is completed.

[0039] The third stroke is the first combustion stroke, the fuel injector 5 sprays fuel for the first time, the fuel is mixed with the compressed high-temperature air and burns to do work, the piston 1 goes down to the bottom dead center b, and the first combustion work is completed.

[0040] The fourth stroke is the exhaust-scavenging stroke, the piston 1 goes up, the exhaust valve 14 and the scavenging passage one-way valve 18 are opened, the exhaust gas is discharged and the fresh air enters the combustion chamber 4 through the scavenging passage 17. The piston goes up to close the exhaust valve 14 and the scavenging passage one-way valve 18 before reaching the top dead center a, and the exhaust and scavenging are completed.

[0041] The fifth stroke is the air storage air supplement compression stroke, the intake valve 13 is opened, the intake pipe valve 16 remains closed, the high-pressure air in the air storage cavity 15 enters the combustion chamber 4, and the intake valve 13 is closed after the fresh air is supplemented, and the piston 1 continues to go up for the second compression to the top dead center a.

[0042] The sixth stroke is the second combustion stroke, the fuel injector 5 sprays fuel again, the mixed gas burns to do work, and pushes the piston 1 to go down to the bottom dead center b. Then the exhaust valve 14 is opened to discharge the combustion products, and the piston 1 goes up again to enter the next cycle.

[0043] Through the combination of the above six strokes, two combustion work processes are realized, and the second combustion is supported by the air storage cavity to improve the combustion stability and energy output efficiency.

[0044] Embodiment three, combination Figures 1-2 This embodiment is described in detail through specific examples, and the technical solutions provided above are described in detail. Referring to Figure 1 The combined intake two-stage combustion six-stroke engine of the embodiment includes a combustion chamber assembly, a fuel injector, a transmission mechanism, and a valve distribution mechanism.

[0045] The combustion chamber assembly includes a piston 1, a cylinder 2, and a cylinder head 3. The piston 1 reciprocates up and down in the cylinder 2, and the center line of the piston 1 coincides with the center line of the cylinder 2. The cylinder head 3 is connected with the cylinder 2 to seal the cylinder 2 and arrange various valve parts. The inner wall surface of the cylinder 2, the upper end surface of the piston 1, and the lower end surface of the cylinder head 3 form a combustion chamber 4.

[0046] The fuel injector 5 is installed at the center of the cylinder head 3.

[0047] The transmission mechanism includes a connecting rod 6, a crank 7, a crank pin 8, a crankshaft 9 and a piston pin 10, which are used to convert the reciprocating motion of the piston 1 into the rotary motion of the crankshaft 9, realizing the conversion of heat energy into mechanical energy. The connecting rod 6 is connected with the crank 7 through the crank pin 8, and the movement track of the crank pin 8 is a circular track. The crank 7 is connected with the crankshaft 9, and the crank 7 rotates around the crankshaft 9. The piston pin 10 is used to connect the connecting rod 6 with the piston 1. The valve mechanism includes an intake duct 11, an exhaust duct 12, an intake valve 13, an exhaust valve 14, a gas storage cavity 15, an intake duct valve 16, a scavenging duct 17 and a scavenging duct one-way valve 18. The intake duct 11 and the exhaust duct 12 are arranged on the cylinder head 3 and are respectively located on the two sides of the fuel injector 5, and are in communication with the inside of the combustion chamber 4. The intake valve 13 is arranged at the communication position of the intake duct 11 and the combustion chamber 4, and is used to control the isolation or communication between the combustion chamber 4 and the intake duct 11. The exhaust valve 14 is arranged at the communication position of the exhaust duct 12 and the combustion chamber 4, and is used to control the isolation or communication between the combustion chamber 4 and the exhaust duct 12. The gas storage cavity 15 is arranged on the intake duct 11 and is used to store gas. The intake duct valve 16 is arranged on the intake duct 11 and is located at the front end of the gas storage cavity 15, and is used to control the isolation or communication between the rear part of the intake duct 11 containing the gas storage cavity 15 and the outside. The scavenging duct 17 is arranged at the lower part of the cylinder 2 and is in communication with the inside of the combustion chamber 4. The scavenging duct one-way valve 18 is arranged at the communication position of the scavenging duct 17 and the combustion chamber 4, and is used to control the isolation or communication between the scavenging duct 17 and the combustion chamber 4, and the gas can only enter the combustion chamber 4 from the scavenging duct 17 and cannot be reversed.

[0048] The steps of the combustion method include: When the piston 1 in the cylinder 2 is at the top dead center a, the intake duct valve 16 is opened, the intake valve 13 is opened, the exhaust valve 14 is closed, the scavenging duct one-way valve 18 is closed, and the piston 1 descends, and the outside gas enters the combustion chamber 4. When the piston 1 descends to the bottom dead center b, the intake duct valve 16 is closed, the piston 1 ascends to compress the gas, and when the piston 1 ascends to the position before the fuel injector 5 sprays oil, the intake valve 13 is closed. At this time, the high-temperature and high-pressure gas in the rear part of the intake duct 11 containing the gas storage cavity 15 and the high-temperature and high-pressure gas in the combustion chamber 4 are isolated, the combustion chamber 4 is a closed space, and the piston 1 continues to ascend to the top dead center a, completing the intake stroke and the compression stroke.

[0049] The fuel injector 5 sprays oil into the combustion chamber 4, the oil mixes with the remaining high-temperature and high-pressure gas in the combustion chamber 4 to burn and do work, and the piston 1 descends. At this time, the combustion chamber 4 is still a closed space. The piston 1 descends to the bottom dead center b to complete the combustion stroke.

[0050] The piston 1 goes up, the exhaust valve 14 is opened, the scavenging passage one-way valve 18 is opened, the burned gas in the combustion chamber 4 is discharged, fresh air enters the combustion chamber 4 through the scavenging passage 17, before the piston 1 goes up to the top dead center a, the exhaust valve 14 is closed, the scavenging passage one-way valve 18 is closed, the intake valve 13 is opened, at the same time, the intake passage valve 16 remains closed, the high-temperature and high-pressure gas in the gas storage cavity 15 is released and enters the combustion chamber 4, further supplementing the fresh air in the combustion chamber 4, then the intake valve 13 is closed, the piston 1 goes up to compress the gas, the piston 1 goes up to the top dead center a, completing the scavenging-compression stroke. At the same time, the fuel injector 5 sprays fuel for the second time, the fuel mixes with the gas in the combustion chamber 4 and burns to do work, and the piston 1 goes down. The piston 1 goes down to the bottom dead center b, and the combustion stroke is completed. The exhaust valve 14 is opened, the burned gas generated after the second combustion is discharged, the piston 1 goes up to the top dead center a, the exhaust valve 14 is closed, and the next cycle is entered.

[0051] The above further describes the technical solutions provided by the present application through several specific embodiments, in order to highlight the advantages and benefits of the technical solutions provided by the present application. However, the above several specific embodiments are not used as a limitation on the present application, any reasonable modification and improvement of the present application, combination and equivalent replacement of the embodiments, etc. based on the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A two-stage combustion six-stroke engine with combined intake, characterized in that: include: The combustion chamber assembly, fuel injector, transmission mechanism and valve mechanism, the valve mechanism includes an intake pipe, an exhaust pipe, an air storage chamber, an intake pipe valve, a scavenging duct and a scavenging duct one-way valve. The engine working cycle includes two intakes and two injections and combustion works. The second intake releases gas from the air storage chamber to supplement the fresh air in the combustion chamber.

2. A combined intake two-stage combustion six-stroke engine according to claim 1, characterized in that: The combustion chamber assembly includes a cylinder, a piston and a cylinder head. The piston reciprocates in the cylinder, and the cylinder and the cylinder head are sealed to form a combustion chamber.

3. A combined intake two-stage combustion six-stroke engine according to claim 1, characterized in that: The fuel injector is located in the center of the cylinder head and is used to inject fuel into the combustion chamber before the two combustions.

4. A combined intake two-stage combustion six-stroke engine according to claim 1, characterized in that: The transmission mechanism includes a connecting rod, a crank, a crank pin, a crankshaft and a piston pin, which are used to convert the reciprocating motion of the piston into the rotational motion of the crankshaft.

5. A combined intake two-stage combustion six-stroke engine according to claim 1, characterized in that: The air storage chamber is arranged on the air intake pipe, and the air intake pipe valve is arranged at the front end of the air storage chamber to control the communication between the air storage chamber and the outside world.

6. A combined intake two-stage combustion six-stroke engine according to claim 1, characterized in that: The scavenging passage is arranged at the lower part of the cylinder and is communicated with the combustion chamber. The scavenging passage one-way valve is arranged between the scavenging passage and the combustion chamber, and only allows gas to enter the combustion chamber from the scavenging passage.

7. A control method for a two-stage combustion six-stroke engine with combined intake, characterized in that: The engine according to claim 1 is implemented as follows: Close the intake valve, trigger the first fuel injection and perform the combustion and work steps; Control the exhaust valve and the scavenging duct one-way valve to open and complete the exhaust and scavenging steps; Open the air intake valve and close the air intake pipe valve to release the gas in the air storage chamber to complete the air replenishment step; After closing the intake valve, compression is performed to trigger the second fuel injection and complete the second combustion step; Open the exhaust valve to complete the second exhaust step.

8. A computer storage medium for storing a computer program, characterized in that When the computer program is read by a computer, the computer executes the method according to claim 7 .

9. A computer comprising a processor and a storage medium, characterized in that When the processor reads the computer program stored in the storage medium, the computer executes the method according to claim 7 .

10. A computer program product, being a computer program, characterized in that When the computer program is executed, the method according to claim 7 is implemented.

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