Large-load unmanned engine system and control method thereof

Abstract

The invention aims at providing a large-load unmanned engine system and a control method thereof.The large-load unmanned engine system comprises an engine body assembly, a power assembly and a fuel assembly, the engine body assembly comprises an engine brake, at least two cylinder bodies and at least two spark plugs, and every two cylinder bodies are arranged on the engine brake in a central symmetry mode; the sparking plugs are arranged at the ends, away from the machine brake, of the cylinder bodies respectively, an air inlet hole is formed in the position, between the two cylinder bodies in the same set, of the machine brake, the machine brake and the cylinder bodies are each provided with a scavenging channel, each cylinder body is provided with an exhaust hole, and the power assembly comprises a crankshaft, at least two pistons and at least two connecting rods. The crankshaft is rotatably arranged in the brake, the pistons are slidably arranged in the cylinders respectively, the connecting rods are rotatably connected with the pistons respectively, the connecting rods are rotatably connected with the crankshaft, the fuel assembly comprises at least one air inlet valve and at least one carburetor, the air inlet valves are arranged on the air inlet holes respectively, and the carburetors are arranged on the air inlet valves respectively.

Description

Technical Field

[0001] This invention relates to the technical field of engines, and in particular to a large-payload unmanned engine system and its control method. Background Technology

[0002] Unmanned aerial vehicles (UAVs), controlled by radio remote control devices or their own program control devices, have been widely used in various fields such as aerial photography and mapping, agricultural plant protection, power line inspection, and emergency rescue. Among the core components of UAVs, the engine, as the power output source, directly determines the flight efficiency, endurance, and operational reliability of the UAV due to its operational stability, fuel economy, and power performance. Therefore, the structural design and control technology of the engine have always been a key research focus in the field of UAVs.

[0003] Furthermore, engines are currently broadly classified into two-stroke engines and four-stroke engines. Two-stroke engines perform work once every two strokes, theoretically twice the frequency of work per unit time compared to four-stroke engines. They are also lightweight and compact with high power density, making them suitable for the "short-term high-power output" requirements of drones, such as agricultural drones taking off with a load and racing drones maneuvering at high speeds. Their power response is more sensitive, allowing them to quickly adapt to changes in working conditions.

[0004] For example, Chinese patent document CN203403950U discloses a small two-stroke four-cylinder aircraft engine, which includes a crankcase, four cylinder blocks, four carburetors, an ignition mechanism, and a throttle control mechanism. Its features include: four cylinder blocks horizontally opposed to each other on both sides of the crankcase; a crankshaft mounted on the crankcase; the crankshaft connected to pistons in the four cylinder blocks via connecting rods; four carburetors mounted on the intake ports of the four cylinder blocks via flanges; and a throttle control mechanism including a base plate fixed to the middle of the upper surface of the crankcase, a pin perpendicular to the base plate fixed to the base plate, a rocker arm hinged to the middle of the pin, and a sleeve on the pin. A torsion spring is used, with one end hooked to a rocker arm and the other end hooked to a base plate. One end of the rocker arm has a tie rod connection hole, and the other end has both a tie rod connection hole and a control lever connection hole. The two tie rod connection holes on the rocker arm are hinged to one end of a tie rod, and the control lever connection hole on the rocker arm is hinged to the throttle control lever. Each of the four carburetor throttle valves has a crank arm fixed to its shaft. The swing ends of two crank arms on the same side are connected by a connecting rod, and the swing end of one of the crank arms on the same side is also hinged to the other end of a tie rod. The ignition mechanism synchronously ignites two opposing cylinders and ignites the other two opposing cylinders at a 180-degree offset. Thus, the throttle control mechanism is positioned between the four carburetors, simultaneously controlling the opening of the throttle valves of all four carburetors, making throttle control of the four cylinders flexible and convenient.

[0005] However, the existing method of equipping each cylinder with a carburetor and simultaneously controlling the opening of all four carburetors has the following drawbacks: Due to the large number of carburetors, the valve opening and fuel supply are controlled mechanically (e.g., by butterfly valves). During engine setup, each carburetor needs to be individually adjusted to ensure that the cylinders in pairs are operating under identical conditions, thus ensuring the stability and continuity of engine power output. However, the large number of carburetors makes engine setup cumbersome and makes it difficult to quickly bring the engine to its optimal operating state. Therefore, to address these shortcomings, this application proposes a high-payload unmanned engine system and its control method. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-load unmanned engine system and its control method that are easy to debug, thereby enabling the engine to be in a stable power output shaft state.

[0008] The technical solution adopted in this invention is: A high-payload unmanned engine system, comprising: The engine block assembly includes a brake, at least two cylinders, and at least two spark plugs. Each pair of cylinders is centrally symmetrically arranged on the brake. Each spark plug is located at the end of each cylinder away from the brake. An air intake port is provided between the two cylinders in the same group on the brake. A scavenging passage is provided between the brake and each cylinder. Each cylinder has an exhaust port. A power assembly, comprising a crankshaft, at least two pistons, and at least two connecting rods, wherein the crankshaft is rotatably disposed within the brake, each piston is slidably disposed within its respective cylinder, and each connecting rod is rotatably connected to its respective piston, and each connecting rod is rotatably connected to the crankshaft. A fuel assembly, the fuel assembly including at least one intake valve and at least one carburetor, each of the intake valves being disposed on each of the intake ports, and each of the carburetors being disposed on each of the intake valves.

[0009] Optionally, the cylinder block, spark plug, piston, and connecting rod are each provided with four components. The brake has two fuel chambers, with two cylinder blocks communicating with one of the fuel chambers and the other two cylinder blocks communicating with the other fuel chamber. There are two air intake ports, each communicating with one of the two fuel chambers. The intake valve and carburetor are each provided with two components.

[0010] Optionally, the high-payload unmanned engine system further includes a starting assembly, which includes a base plate, a driven gear, a starter motor, and a drive gear. The base plate is disposed on one end of the brake, the driven gear is coaxially disposed on one end of the crankshaft, the starter motor is disposed on the base plate, and the drive gear is disposed on the output shaft of the starter motor, and the drive gear meshes with the driven gear.

[0011] Optionally, the base plate is provided with a plurality of support columns, each of the support columns extending from the base plate in a direction away from the gate.

[0012] Optionally, the fuel assembly further includes an air filter disposed on the intake end of each of the carburetors.

[0013] Optionally, each of the exhaust ports is provided with a silencer pipe.

[0014] Optionally, a number of spaced-apart heat dissipation fins are provided on the outer side wall of the cylinder.

[0015] Optionally, two sealing rings are fitted on the crankshaft, and the two sealing rings are located between the two fuel chambers.

[0016] Optionally, a clearance groove is provided on one end face of the sealing ring near the fuel chamber.

[0017] A control method for a high-payload unmanned engine system: In step S100, the carburetor mixes air and fuel in a predetermined ratio to form a fresh air-fuel mixture; In step S200, when the crankshaft rotates to drive the two pistons in the same set of cylinders to rise simultaneously from the bottom dead center, a negative pressure is formed in the brake, so that the fresh air-fuel mixture in the carburetor enters the brake through the intake valve. After the two pistons close the two exhaust ports respectively, they compress the fresh air-fuel mixture in the corresponding cylinders respectively. Step S300: When both pistons are at top dead center, the two spark plugs simultaneously ignite the compressed fresh air-fuel mixture in the corresponding cylinder. The fresh air-fuel mixture is burned to form exhaust gas. The two pistons are subjected to force to descend from top dead center at the same time, thereby driving the crankshaft to rotate. The intake valve is closed. The two pistons simultaneously pre-compress the fresh air-fuel mixture in the engine brake. In step S400, when the two pistons slide in the corresponding cylinders to open the corresponding exhaust ports, the exhaust gas in the two cylinders is discharged from the corresponding exhaust ports, and at the same time, the two pistons further pre-compress the fresh mixture in the brake. Step S500: When the two pistons slide in the corresponding cylinders to open the corresponding scavenging passages, the pre-compressed fresh mixed gas in the brake passes through the two scavenging passages to enter the two cylinders respectively, further dispersing the exhaust gas in the two cylinders. In step S600, the two pistons slide within their respective cylinders to reach the bottom dead center.

[0018] The beneficial effects of this invention are: The present invention discloses a high-payload unmanned engine system and its control method, comprising a body assembly, a power assembly, and a fuel assembly. The body assembly includes a brake, at least two cylinders, and at least two spark plugs. Each pair of cylinders is centrally symmetrically arranged on the brake. Each spark plug is located at the end of each cylinder away from the brake. An air intake port is provided between the two cylinders in the same group on the brake. A scavenging passage is provided between the brake and each cylinder. Each cylinder has an exhaust port. The power assembly includes a crankshaft, at least two pistons, and at least two connecting rods. The crankshaft is rotatably disposed within the brake. Each piston is slidably disposed within each cylinder. Each connecting rod is rotatably connected to each piston and is rotatably connected to the crankshaft. The fuel assembly includes at least one intake valve and at least one carburetor. Each intake valve is disposed on each intake port, and each carburetor is disposed on each intake valve. In this way, by setting a single carburetor to provide fresh air-fuel mixture to two cylinders through the intake valve, the number of carburetors can be reduced by half compared to the existing technology that requires a carburetor for each cylinder, thus reducing manufacturing costs. Moreover, the reduction in the number of carburetors means less setup time, thereby reducing engine setup time, improving setup efficiency, and also improving the stability of crankshaft power output. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a large-payload unmanned engine system according to an embodiment of the present invention; Figure 2 for Figure 1 A structural schematic diagram of the high-payload unmanned engine system from another angle; Figure 3 for Figure 1 A partial structural schematic diagram of a high-payload unmanned engine system is shown. Figure 4 for Figure 3 A partial structural cross-sectional view of the high-payload unmanned engine system shown. Figure 5 for Figure 3 A partial structural cross-sectional view of the high-payload unmanned engine system from another angle, as shown. Figure 6This is a schematic diagram of the installation structure of the sealing ring according to one embodiment of the present invention; Figure 7 This is a cross-sectional view of a portion of the structure of a fuel assembly according to an embodiment of the present invention; Figure 8 This is a flowchart of a control method for a high-payload unmanned engine system according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 10. High-payload unmanned engine system; 100. Body assembly; 200. Power assembly; 300. Fuel assembly; 110. Brake; 120. Cylinder block; 130. Spark plug; 111. Intake port; 112. Scavenging passage; 121. Exhaust port; 210. Crankshaft; 220. Piston; 230. Connecting rod; 310. Intake valve; 320. Carburetor; 101. Fuel chamber; 400. Starting assembly; 410. Seat plate; 420. Driven gear; 430. Starter motor; 440. Drive gear; 450. Support column; 330. Air filter; 500. Muffler; 122. Heat sink; 240. Sealing ring; 241. Clearance groove; 340. Slide block; 350. Slider; 360. Main control cable; 370. Sub-control cable. Detailed Implementation

[0023] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention.

[0024] like Figures 1 to 4 As shown, a high-payload unmanned engine system 10 includes a body assembly 100, a power assembly 200, and a fuel assembly 300. The body assembly 100 includes a brake 110, at least two cylinders 120, and at least two spark plugs 130. Each pair of cylinders 120 is centrally symmetrically arranged on the brake 110. Each spark plug 130 is located at the end of each cylinder 120 furthest from the brake 110. An air intake port 111 is provided between the two cylinders 120 in the same group on the brake 110. A scavenging passage 112 is provided between the brake 110 and each cylinder 120. Each cylinder 20 has an exhaust port 121. The power assembly 200 includes a crankshaft 210, at least two pistons 220, and at least two connecting rods 230. The crankshaft 210 is rotatably disposed in the brake 110. Each piston 220 is slidably disposed in each cylinder 120. Each connecting rod 230 is rotatably connected to each piston 220 and is rotatably connected to the crankshaft 210. The fuel assembly 300 includes at least one intake valve 310 and at least one carburetor 320. Each intake valve 310 is disposed on each intake port 111, and each carburetor 320 is disposed on each intake valve 310.

[0025] It should be noted that the engine block assembly 100 uses the brake 110 as the mounting carrier, and at least two cylinder blocks 120 are arranged symmetrically on the brake 110 in pairs. This symmetrical layout can balance the vibration during engine operation and improve stability. A spark plug 130 is installed at the end of each cylinder block 120 away from the brake 110 to ignite the in-cylinder mixture. At the same time, the brake 110 has a common intake port 111 for the two cylinder blocks 120 in the same group, and also has a scavenging passage 112 for each cylinder block 120. Each cylinder block 120 has an exhaust port 121, forming the basic air path of "intake-scavenging-exhaust". The crankshaft 210 of the power assembly 200 is rotatably mounted in the brake 110, serving as the core of power output. A piston 220 is slidably installed in each cylinder block 120, and the piston 220 is rotatably connected to the crankshaft 210 through a connecting rod 230. During operation, the combustion of fuel gas in the cylinder drives the piston 220 in a reciprocating motion. The connecting rod 230 converts this reciprocating motion into the rotational motion of the crankshaft 210, ultimately outputting power. In the fuel assembly 300, each intake port 111 is equipped with an intake valve 310, and each intake valve 310 is fitted with a carburetor 320, forming a fuel supply path of "carburetor 320 - intake valve 310 - intake port 111". The carburetor 320 mixes fuel and air in a specific ratio, and the intake valve 310 controls the timing of the mixed fuel gas entering the cylinder. The mixed fuel gas enters the two cylinders 120 in the same group through the intake port 111, and then, in conjunction with the scavenging passage 112, completes in-cylinder air exchange. Finally, it is ignited by the spark plug 130, driving the power assembly. Thus, compared to the existing "one carburetor per cylinder" design, this solution reduces the number of carburetors 320 that need to be adjusted by having "one carburetor 320 shared by every two cylinders 120" (halving the number of carburetors). During the commissioning phase, it is not necessary to calibrate each carburetor 320 of each cylinder block 120 individually. Only parameter settings are required for each individual carburetor 320 within each group of cylinder blocks 120, significantly shortening commissioning time and reducing the operating costs for professional personnel. Simultaneously, it reduces the procurement and assembly of carburetor 320s and related components, lowering manufacturing costs and assembly complexity. Furthermore, the cylinder blocks 120 employ a centrally symmetrical group arrangement, which can offset the vibration and impact forces of each group of cylinder blocks 120 during engine operation, reducing the overall vibration amplitude and meeting the stability requirements of high-load unmanned equipment for the power system. The independent design of the scavenging passage 112 and the exhaust port 121, combined with the precise control of the intake valve 310, optimizes the scavenging efficiency within the cylinder blocks 120, reduces exhaust gas residue, and improves combustion completeness, thereby improving engine power performance and fuel economy. Furthermore, the power assembly 200, through the collaborative work of multiple cylinder blocks 120 groups and with an efficient gas supply and power conversion structure, can output stable high-load power to meet the power requirements of unmanned equipment (such as drones).

[0026] like Figure 5As shown, in one embodiment, four cylinder blocks 120, four spark plugs 130, four pistons 220, and four connecting rods 230 are provided. Two fuel chambers 101 are opened in the brake 110. Two cylinder blocks 120 are connected to one of the fuel chambers 101, and the other two cylinder blocks 120 are connected to the other fuel chamber 101. Two air intake ports 111 are provided, and the two air intake ports 111 are connected to the two fuel chambers 101 respectively. Two intake valves 310 and two carburetors 320 are provided.

[0027] Thus, two of the four cylinder blocks 120 are grouped together, and an intake port 111 is opened on the brake 110 between the two cylinder blocks 120 in each group. Therefore, two spaced-apart intake ports 111 are opened on the brake 110, and two intake valves 310 are respectively installed in the two intake ports 111. Two carburetors 320 are respectively installed on the two intake valves 310. In this way, compared to the existing four-cylinder two-stroke engine structure that requires four carburetors, the large-load unmanned engine system 10 of this application can achieve four-cylinder drive by installing two carburetors 320. By reducing the number of carburetors 320, the complexity of manufacturing and assembly is reduced. In particular, when the engine is manufactured and tested, the workload of engine testing can be greatly reduced, thereby improving engine testing efficiency.

[0028] like Figure 1 and Figure 2 As shown, in one embodiment, the large-payload unmanned engine system 10 further includes a starting assembly 400. The starting assembly 400 includes a base plate 410, a driven gear 420, a starter motor 430, and a drive gear 440. The base plate 410 is disposed on one end of the brake 110. The driven gear 420 is coaxially disposed on one end of the crankshaft 210. The starter motor 430 is disposed on the base plate 410. The drive gear 440 is disposed on the output shaft of the starter motor 430, and the drive gear 440 meshes with the driven gear 420.

[0029] It should be noted that the driven gear 420 is coaxially arranged with the crankshaft 210, and the driving gear 440 is fixedly connected to the output shaft of the starter motor 430 and meshes with the driven gear 420, forming a power transmission path of "starter motor 430 - driving gear 440 - driven gear 420 - crankshaft 210". During operation, the torque output by the starter motor 430 is precisely transmitted to the crankshaft 210 through the meshing of the driving gear 440 and the driven gear 420, driving the crankshaft 210 to rotate, which in turn drives the piston 220 to move, realizing the air exchange and combustion combustion in the cylinder block 120, ensuring the engine starts quickly and stably. Compared with the traditional starting structure, the meshing transmission of the driving gear 440 and the driven gear 420 has less torque loss and higher transmission efficiency, which can meet the demand for larger initial torque when starting a heavy-load engine and avoid starting failure due to insufficient starting power. Furthermore, the base plate 410 fixes the starter motor 430 to one end of the brake 110, forming a compact integrated structure between the starter assembly 400 and the body assembly 100. This avoids the starter assembly 400 occupying too much space and adapts to the "small size, high integration" installation requirements of the power system for large-load unmanned equipment. Simultaneously, the passive gear 420 is coaxially assembled with the crankshaft 210, and the active gear 440 is directly connected to the output shaft of the starter motor 430, simplifying the transmission chain, reducing the number of intermediate connecting parts, lowering the risk of structural loosening, and further improving the overall structural stability of the system. Furthermore, for large-load unmanned equipment, the starter assembly 400, through the electronically controlled drive of the starter motor 430, can directly link with the control system of the unmanned equipment, completing the starting operation without manual intervention. This meets the "automatic start-stop" functional requirements of the power system in unmanned operation scenarios, improving the overall automation level and operational efficiency of the equipment.

[0030] like Figure 1 and Figure 2 As shown, in one embodiment, a plurality of support columns 450 are provided on the seat plate 410, and each support column 450 extends from the seat plate 410 in a direction away from the gate 110.

[0031] It should be noted that each support column 450 is located around the driven gear 420. To facilitate the fixed installation of the engine of this application on the unmanned equipment, several support columns 450 are fixedly installed on the base plate 410, each extending away from the gate 110. In one embodiment, four support columns 450 are provided, and the four support columns 450 are distributed at equal angles to the driven gear 420.

[0032] like Figure 1 As shown, in one embodiment, the fuel assembly 300 further includes an air filter 330, which is disposed on the intake end of each carburetor 320.

[0033] It should be noted that, in order to prevent air from directly entering the carburetor 320, an air filter 330 is installed at the air inlet of the carburetor 320. In one embodiment, the air filter 330 shields the air inlet of each carburetor 320.

[0034] like Figure 1 As shown, in one embodiment, each exhaust port 121 is provided with a silencer pipe 500.

[0035] It should be noted that the muffler pipe 500 is installed on the exhaust port 121, and the muffler pipe 500 has the functions of both muffler and exhaust gas collection.

[0036] like Figure 1 As shown, in one embodiment, a plurality of spaced heat dissipation fins 122 are provided on the outer side wall of the cylinder 120.

[0037] It should be noted that each cylinder block 120 has multiple spaced-apart heat dissipation fins 122 on its outer side wall. Thus, when the engine generates a large amount of heat due to combustion of fuel gas, the heat can be quickly exchanged with the air through the heat dissipation fins 122, achieving rapid cooling. Furthermore, improved heat dissipation efficiency allows the high-payload unmanned engine system 10 of this application to be applied to unmanned equipment with large loads. Furthermore, faster heat dissipation efficiency can prevent damage to internal engine components such as seals from continuously excessively high temperatures.

[0038] like Figure 5 and Figure 6 As shown, in one embodiment, two sealing rings 240 are fitted on the crankshaft 210, and the two sealing rings 240 are located between the two fuel chambers 101.

[0039] It should be noted that in the four-cylinder two-stroke engine, the pistons 220 of the two cylinders 120 in the same group are in the same working state. The pistons 220 of the two cylinders 120 in the other group are also in the same working state. Furthermore, the pistons 220 in cylinders 120 of different groups are in opposite working states. For example, when the piston 220 in the first group of cylinders 120 is in the power stroke, the piston 220 in the second group of cylinders 120 is in the exhaust / compression stroke. This means that the two fuel chambers 101 are in opposite states. For example, when one fuel chamber 101 is drawing in fresh air from the carburetor 320 through the intake valve 310, the other fuel chamber 101 is in the process of expelling pre-compressed fresh air into the cylinder 120. At this time, the exhaust port 121 is not yet fully closed, meaning that some of the fresh air-fuel mixture will be discharged from the exhaust port 121. Therefore, to maintain sufficient sealing between the two fuel chambers 101 and prevent air leakage that could cause fresh air mixture to mistakenly flow into the other fuel chamber 101, resulting in inconsistent fuel quantities in the two fuel chambers 101, two sealing rings 240 are fitted onto the crankshaft 210. The two sealing rings 240 are located between the two fuel chambers 101. In this way, the two sealing rings 240 effectively seal the two fuel chambers 101.

[0040] like Figure 5 As shown, in one embodiment, a clearance groove 241 is provided on one end face of the sealing ring 240 near the fuel chamber 101.

[0041] It should be noted that the sealing ring 240 is made of silicone. When fresh air-fuel mixture enters the fuel chamber 101, the fresh air-fuel mixture fills the air-cushioning groove 241, pushing against the inner wall of the air-cushioning groove 241, thereby causing the sealing ring 240 to fit tightly against the outer wall of the crankshaft 210 and the inner wall of the brake 110. In this way, the two sealing rings 240 reliably seal the two fuel chambers 101 of the brake 110.

[0042] like Figure 1 and Figure 7 As shown, in one embodiment, the fuel assembly 300 further includes a slide 340, a slider 350, a main control cable 360, and two sub-control cables 370. The slide 340 is disposed adjacent to the brake 110. The slider 350 is slidably disposed within the slide 340. One end of each of the two sub-control cables 370 is connected to the slider 350, and the other end of each sub-control cable 370 is connected to one of the two carburetors 320. The main control cable 360 ​​is connected to the end of the slider 350 away from the sub-control cables 370. The main control cable 370 is used to adjust the two carburetors 320 when the slider 350 is slid relative to the slide 340 under force.

[0043] It should be noted that this embodiment is designed to improve the fuel supply accuracy of each carburetor 320. Specifically, when tension is applied to the main control cable 360, the main control cable 360 ​​drives the slider 350 to slide relative to the slide block 340, thereby causing the slider 350 to simultaneously pull the throttle opening of the two sub-control cables 370. Compared to controlling each carburetor 320 individually, controlling the throttle opening of both carburetor 320 simultaneously by pulling the two sub-control cables 370 through the main control cable 360 ​​can effectively improve the throttle opening accuracy of the two carburetor 320, thereby improving the engine's operational stability. In one embodiment, both the sub-control cable 360 ​​and the main control cable 370 are throttle cables.

[0044] like Figure 1 As shown, a control method for a high-payload unmanned engine system includes the following steps: In step S100, the carburetor mixes air and fuel in a predetermined ratio to form a fresh air-fuel mixture; In step S200, when the crankshaft rotates to drive the two pistons in the same set of cylinders to rise simultaneously from the bottom dead center, a negative pressure is formed in the brake, which allows the fresh air-fuel mixture in the carburetor to enter the brake through the intake valve. After the two pistons close the two exhaust ports respectively, they compress the fresh air-fuel mixture in the corresponding cylinders respectively. Step S300: When both pistons are at top dead center, the two spark plugs simultaneously ignite the compressed fresh air-fuel mixture in the corresponding cylinder. The fresh air-fuel mixture is combusted to form exhaust gas. The two pistons are subjected to force to descend from top dead center at the same time, thereby driving the crankshaft to rotate. The intake valve is closed, and the two pistons simultaneously pre-compress the fresh air-fuel mixture in the engine brake. In step S400, when the two pistons slide in the corresponding cylinders to open the corresponding exhaust ports, the exhaust gas in the two cylinders is discharged from the corresponding exhaust ports respectively, and at the same time, the two pistons further pre-compress the fresh air-fuel mixture in the brake. In step S500, when the two pistons slide in the corresponding cylinders to open the corresponding scavenging passages, the pre-compressed fresh mixed air in the brake passes through the two scavenging passages to enter the two cylinders respectively, further dispersing the exhaust gas in the two cylinders. In step S600, the two pistons slide within their respective cylinders to reach the bottom dead center.

[0045] It should be noted that steps S200 to S600 constitute one working cycle. After step S600 ends, step S200 continues to cycle. In step S100, the carburetor 320 mixes a certain proportion of fuel (e.g., gasoline) with air, allowing the fresh air-fuel mixture to be delivered into the fuel chamber 101 of the cylinder block 110 through the intake port 111 via the intake valve 310. It is important to note that the intake valve 310 is a one-way valve. Thus, when the piston slides and rises within the cylinder, the volume of the fuel chamber 101 increases, creating a negative pressure. Therefore, the pressure of the fresh air-fuel mixture within the carburetor is greater than the pressure in the fuel chamber 101. This pressure difference opens the intake valve 310, allowing the fresh air-fuel mixture to enter the fuel chamber 101. Furthermore, it should be noted that a sealing ring is fitted on the outer wall of the piston 220, and the sealing ring fits tightly against the inner wall of the cylinder block 120. Thus, when the piston 220 passes the scavenging passage 112 or the exhaust port 121, the cylinder block 120 can be closed to the exhaust port 121 or the scavenging passage 112. Therefore, the control method of the large-load unmanned engine system of this application, which sets a single carburetor 320 to provide fresh air-fuel mixture to two cylinder blocks 120 through the intake valve 310, reduces the number of carburetors 320 by half compared to the prior art structure that requires one carburetor for each cylinder block 120, thereby reducing manufacturing costs. Furthermore, the reduced number of carburetors means less setup time, thus shortening engine setup time and improving setup efficiency.

[0046] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-payload unmanned engine system, characterized in that, include: The engine block assembly includes a brake, at least two cylinders, and at least two spark plugs. Each pair of cylinders is centrally symmetrically arranged on the brake. Each spark plug is located at the end of each cylinder away from the brake. An air intake port is provided between the two cylinders in the same group on the brake. A scavenging passage is provided between the brake and each cylinder. Each cylinder has an exhaust port. A power assembly, comprising a crankshaft, at least two pistons, and at least two connecting rods, wherein the crankshaft is rotatably disposed within the brake, each piston is slidably disposed within its respective cylinder, and each connecting rod is rotatably connected to its respective piston, and each connecting rod is rotatably connected to the crankshaft. A fuel assembly, the fuel assembly including at least one intake valve and at least one carburetor, each of the intake valves being disposed on each of the intake ports, and each of the carburetors being disposed on each of the intake valves.

2. The high-payload unmanned engine system according to claim 1, characterized in that, The cylinder block, spark plug, piston, and connecting rod are each provided with four. The brake has two fuel chambers, with two of the cylinder blocks communicating with one of the fuel chambers and the other two cylinder blocks communicating with the other fuel chamber. There are two air intake ports, each communicating with one of the two fuel chambers. The intake valve and carburetor are each provided with two.

3. The high-payload unmanned engine system according to claim 2, characterized in that, The high-payload unmanned engine system also includes a starting assembly, which includes a base plate, a driven gear, a starter motor, and a drive gear. The base plate is disposed on one end of the brake, the driven gear is coaxially disposed on one end of the crankshaft, the starter motor is disposed on the base plate, and the drive gear is disposed on the output shaft of the starter motor, and the drive gear meshes with the driven gear.

4. The high-payload unmanned engine system according to claim 3, characterized in that, The base plate is provided with a plurality of support columns, each of which extends from the base plate in a direction away from the gate.

5. The high-payload unmanned engine system according to claim 2, characterized in that, The fuel assembly also includes an air filter disposed on the intake end of each of the carburetors.

6. The high-payload unmanned engine system according to claim 2, characterized in that, Each of the aforementioned exhaust ports is equipped with a silencer pipe.

7. The high-payload unmanned engine system according to claim 2, characterized in that, The outer wall of the cylinder is provided with several spaced heat dissipation fins.

8. The high-payload unmanned engine system according to claim 2, characterized in that, Two sealing rings are fitted on the crankshaft, and the two sealing rings are located between the two fuel chambers.

9. The high-payload unmanned engine system according to claim 8, characterized in that, An air-proof groove is provided on one end face of the sealing ring near the fuel chamber.

10. The control method for the large-payload unmanned engine system according to claim 1, characterized in that: In step S100, the carburetor mixes air and fuel in a predetermined ratio to form a fresh air-fuel mixture; In step S200, when the crankshaft rotates to drive the two pistons in the same set of cylinders to rise simultaneously from the bottom dead center, a negative pressure is formed in the brake, so that the fresh air-fuel mixture in the carburetor enters the brake through the intake valve. After the two pistons close the two exhaust ports respectively, they compress the fresh air-fuel mixture in the corresponding cylinders respectively. Step S300: When both pistons are at top dead center, the two spark plugs simultaneously ignite the compressed fresh air-fuel mixture in the corresponding cylinder. The fresh air-fuel mixture is burned to form exhaust gas. The two pistons are subjected to force to descend from top dead center at the same time, thereby driving the crankshaft to rotate. The intake valve is closed. The two pistons simultaneously pre-compress the fresh air-fuel mixture in the engine brake. In step S400, when the two pistons slide in the corresponding cylinders to open the corresponding exhaust ports, the exhaust gas in the two cylinders is discharged from the corresponding exhaust ports, and at the same time, the two pistons further pre-compress the fresh mixture in the brake. Step S500: When the two pistons slide in the corresponding cylinders to open the corresponding scavenging passages, the pre-compressed fresh mixed gas in the brake passes through the two scavenging passages to enter the two cylinders respectively, further dispersing the exhaust gas in the two cylinders. In step S600, the two pistons slide within their respective cylinders to reach the bottom dead center.

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