Hybrid power system of combine harvester and control method thereof

Abstract

The invention belongs to the technical field of mechanical structures, and particularly relates to a hybrid power system of a combine harvester and a control method thereof, the hybrid power system comprises a master controller, a battery assembly, a generator, a threshing mechanism, a header conveying mechanism, a diesel engine, a walking mechanism, a fan device and an auger vibrating screen mechanism. The battery assembly and the generator are electrically connected with the master controller. The diesel engine is electrically connected with the master controller through the engine controller; the threshing mechanism and the header conveying mechanism are electrically connected with the master controller through the electric drive unit. The power output end of the diesel engine is sequentially connected with the fan device, the walking mechanism and the generator through a first transmission unit, and a clutch I is arranged between the walking mechanism and the diesel engine. And the auger vibrating screen mechanism is in transmission connection with the power output end of the fan device. According to the technical scheme, energy utilization and economical efficiency are both considered, pollutant emission is reduced, endurance and operation efficiency is improved, power transmission control is flexible, mechanism driving modes are diversified, and many disadvantages of a traditional power system are overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical structures, and in particular relates to a hybrid power system of a combine harvester and a control method thereof. Background Art

[0002] As agricultural mechanization continues to develop, the power system of the combine harvester, as an important agricultural harvesting equipment, plays a core supporting role. Traditional combine harvesters generally use internal combustion engines as power sources, which have exposed many difficult-to-overcome disadvantages during long-term use. On the one hand, the energy conversion efficiency of the internal combustion engine is relatively low, and a large amount of fuel energy is wasted in the combustion, transmission and other links, which directly leads to the high fuel cost during the operation of the harvester, resulting in energy waste. On the other hand, the internal combustion engine emits a large amount of harmful gases when working, including carbon monoxide, hydrocarbons, nitrogen oxides and particulate matter. These pollutants not only cause serious damage to the surrounding air quality, but also pose a potential threat to the health of agricultural practitioners, and also run counter to the increasingly stringent environmental protection requirements.

[0003] With the rise of new energy technologies, pure electric high-power power sources have brought new ideas for solving the problems of traditional internal combustion engines. The pure electric power system has almost zero emissions during operation, which greatly reduces pollution to the environment and is in line with the concept of green agricultural development. However, at this stage, the application of pure electric power sources in combine harvesters also has obvious shortcomings. First, the cost of batteries and related supporting pure electric technologies remains high, which has greatly increased the cost of the entire combine harvester, exceeding the affordability of many farmers and agricultural production units, and seriously hindering its large-scale promotion and application. Second, due to the current bottlenecks in battery energy density and endurance technology, the endurance of pure electric combine harvesters is seriously insufficient. When operating continuously in large areas of farmland, they need to stop frequently for charging, which greatly reduces the harvesting efficiency and cannot meet the high-intensity and long-term operation requirements during the busy farming season.

[0004] In summary, the respective disadvantages of traditional internal combustion engine power systems and pure electric high-power power systems limit the further development and optimization of combine harvesters, and a new power solution is urgently needed. In this context, this technology proposes a hybrid power system for a combine harvester and a control method thereof. Summary of the invention

[0005] The purpose of the present invention is to propose a hybrid power system for a combine harvester and a control method thereof in response to the deficiencies in the above-mentioned prior art, so as to break the existing difficulties, comprehensively improve the performance and fuel economy of the combine harvester, and promote agricultural mechanization to a higher quality development stage.

[0006] The above objectives are achieved specifically through the following technical solutions: A hybrid power system of a combine harvester includes a master controller, a battery assembly, a generator, a threshing mechanism, a header conveying mechanism, a diesel engine, a traveling mechanism, a fan device, and an augers and vibrating screen mechanism. The battery assembly and the generator are electrically connected to the master controller respectively; the diesel engine is electrically connected to the master controller through an engine controller; the threshing mechanism and the header conveying mechanism are electrically connected to the master controller through an electric drive unit. A first transmission unit is provided at the power output end of the diesel engine; the first transmission unit includes a first driving pulley, a first driven pulley, and a first transmission belt; the first driving pulley is connected to the power output shaft of the diesel engine, and the first driven pulley is connected to the first driving pulley through a first transmission belt. The power input end of the fan device is connected to the first driven pulley, and the augers and vibrating screen mechanism is connected to the power output end of the fan device through a traveling mechanism. The generator is connected to the first driving pulley through a traveling mechanism, and a clutch I is provided between the traveling mechanism and the first driving pulley.

[0007] Preferably, the traveling mechanism includes a traveling assembly and a second transmission unit, and the second transmission unit includes a second driving pulley, a second driven pulley and a second transmission belt; the second driving pulley is coaxially connected to the first driving pulley through clutch I, and the power input shaft of the generator is coaxially fixedly connected to the second driving pulley; the first driven pulley is connected to the first driving pulley through a first transmission belt, and the traveling assembly is connected to the first driven pulley.

[0008] Preferably, the auger vibrating screen mechanism comprises a primary driving pulley, a primary driven pulley I, a primary driven pulley II, a primary transmission belt, a secondary driving pulley, a secondary driven pulley and a secondary transmission belt. The primary driven pulley I and the primary driven pulley II are connected to the primary driving pulley through a primary transmission belt, a seed auger is connected to the primary driven pulley I, and a miscellaneous auger is connected to the primary driven pulley II. The secondary driving pulley is coaxially fixedly connected to the primary driven pulley II; the secondary driven pulley is connected to the secondary driving pulley through a secondary transmission belt, and a vibrating screen is connected to the secondary driven pulley.

[0009] Preferably, the electric drive unit includes a drive motor I and a drive motor II; the threshing mechanism is electrically connected to the main controller via the drive motor I; and the harvesting platform conveying mechanism is electrically connected to the main controller via the drive motor II.

[0010] Preferably, the electric drive unit includes a main drive motor and a clutch II; the main drive motor is electrically connected to the main controller; the threshing mechanism and the harvesting platform conveying mechanism are transmission-connected to the main drive motor via the clutch II.

[0011] Preferably, the threshing mechanism includes a reducer and a threshing drum, the power input end of the reducer is transmission-connected to the electric drive unit, and the threshing drum is transmission-connected to the power output end of the reducer via a clutch III.

[0012] Preferably, the threshing mechanism includes a threshing drum and a third transmission unit, the third transmission unit includes a third driving pulley, a third driven pulley and a third transmission belt; the third driving pulley is transmission-connected to the electric drive unit, and the third driven pulley is transmission-connected to the third driving pulley through the third transmission belt; the threshing drum is connected to the third driven pulley through a gear mechanism.

[0013] Preferably, the harvesting platform conveying mechanism includes a reel, a conveying sprocket and a fourth transmission unit, the fourth transmission unit includes a fourth driving pulley, a fourth driven pulley and a fourth transmission belt; the fourth driving pulley is transmission-connected to the electric drive unit, and the fourth driven pulley is transmission-connected to the fourth driving pulley via the fourth transmission belt; the reel and the conveying sprocket are respectively connected to the fourth driven pulley.

[0014] A control method for a hybrid power system of a combine harvester, comprising a normal load mode, a heavy load mode and a harvester transfer mode; In the normal load mode, the diesel engine drives the traveling mechanism, the fan device and the auger vibrating mechanism to operate, so as to maintain the basic movement and auxiliary operation of the harvester; at the same time, the diesel engine drives the generator to generate electricity, and the electric energy is stored in the battery assembly; the battery assembly supplies power to the electric drive unit to drive the threshing mechanism and the header conveying mechanism; The heavy load mode: when the harvester faces a sudden increase in feed volume and a sharp increase in the load of the header conveying mechanism and the threshing mechanism, the diesel engine drives the generator to generate electricity, and the generator output power cooperates with the battery assembly power to supply power to the electric drive unit; on this basis, the diesel engine continues to output and the speed is stable, so that the travel mechanism, the fan device and the auger vibration mechanism operate continuously; The harvester transfer mode: at this time, only the traveling mechanism works, the main controller converts the generator into the driving mode, disconnects the clutch I between the traveling mechanism and the first transmission unit, and the battery assembly supplies power to the generator to drive the traveling mechanism.

[0015] This technical solution has the following beneficial effects: 1) Improve the comprehensive efficiency of energy utilization: The hybrid power system combines diesel engine and electric drive. Compared with the traditional pure internal combustion engine power system, it can allocate energy more reasonably according to different operation links and working conditions, avoiding the situation where a large amount of energy is wasted in each link like the internal combustion engine. It helps to improve the overall energy utilization efficiency, thereby reducing fuel costs, improving fuel economy, and overcoming the disadvantage of low energy conversion efficiency of traditional internal combustion engines.

[0016] 2) Reduce equipment cost pressure: Compared with the existing pure electric power source, the hybrid power system of this technical solution is combined with a diesel engine whose cost is relatively easier to control, which can avoid the problem of excessive cost brought by pure electric technology to a certain extent, making the cost of the whole machine in a relatively more reasonable range, which is more conducive to being accepted by farmers and agricultural production units, and solves the problem of excessively high cost hindering the promotion of pure electric power source.

[0017] 3) Reduce pollution emissions: The hybrid system incorporates electric drive units and other parts, which can be driven by electricity in some operating links. Compared with traditional internal combustion engines that emit large amounts of harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides and particulate matter, this hybrid system can achieve zero emissions or reduce emissions under some operating conditions, which is in line with the current concept of green agricultural development and improves the environmental disadvantages of traditional internal combustion engines, such as damage to surrounding air quality and health threats to practitioners.

[0018] 4) Improve endurance to ensure operation continuity: With diesel engines as a power supplement, unlike pure electric combine harvesters, which are limited by the current battery energy density and endurance technology bottlenecks and need to be frequently shut down for charging, when operating continuously in large areas of farmland, the hybrid power system can rely on diesel engines to continuously provide power, reduce the number of shutdowns, and ensure the continuity of harvesting operations, thereby improving harvesting efficiency and meeting the high-intensity and long-term operation requirements during the busy farming season, overcoming the shortcomings of insufficient endurance of pure electric power sources.

[0019] 5) Flexible power transmission and control configuration: The battery assembly, generator, diesel engine and various operating mechanisms (such as threshing mechanism, harvesting table conveying mechanism, etc.) are electrically connected and reasonably controlled through the main controller. Multiple transmission units and clutches are set up to achieve flexible switching and precise control of power transmission between various mechanisms, so that the various mechanisms of the combine harvester can coordinate and cooperate in different operating scenarios to optimize the overall operating performance. This is an advantage in functional and structural design compared to traditional single-power source combine harvesters.

[0020] 6. Diversified mechanism drive implementation methods: For key operating mechanisms such as threshing mechanism and header conveying mechanism, a variety of feasible electric drive unit configuration methods are given, providing more diverse design options, facilitating optimization and adjustment according to actual production and use requirements, and enhancing the overall applicability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a combined harvester hybrid power system structure of a preferred structure; Figure 2 The figure is a schematic diagram of the structure of a combine harvester hybrid power system of another preferred structure.

[0022] in: 1. Master controller; 2. Battery assembly; 3. Generator; 4. Diesel engine; 5. Fan device; 6. Engine controller; 7. Clutch I; 8. First driving pulley; 9. First driven pulley; 10. First transmission belt; 11. Travel assembly; 12. Second driving pulley; 13. Second driven pulley; 14. Second transmission belt; 15. Primary driving pulley; 16. Primary driven pulley I; 17. Primary driven pulley II; 18. Primary transmission belt; 19. Secondary driving pulley; 20. Secondary Driven pulley; 21. Secondary transmission belt; 22. Grain agitator; 23. Miscellaneous agitator; 24. Vibrating screen; 25. Driving motor I; 26. Driving motor II; 27. Main driving motor; 28. Clutch II; 29. ​​Speed ​​reducer; 30. Threshing drum; 31. Clutch III; 32. Third driving pulley; 33. Third driven pulley; 34. Third transmission belt; 35. Gear mechanism; 36. Conveying sprocket; 37. Fourth driving pulley; 38. Fourth driven pulley; 39. Fourth transmission belt. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "fitting", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1 This embodiment discloses a hybrid power system for a combine harvester, as a preferred implementation of the technical solution, such as Figure 1 As shown, it includes a main controller 1, a battery assembly 2, a generator 3, a threshing mechanism, a header conveying mechanism, a diesel engine 4, a traveling mechanism, a fan device 5 and an agitator vibrating mechanism. Each part works closely together to support the efficient operation of the harvester.

[0028] Electrical connection: The battery assembly 2 and the generator 3 are electrically connected to the master controller 1 to ensure accurate allocation and control of electric energy. The diesel engine 4 is electrically connected to the master controller 1 through the engine controller 6. This link enables the master controller 1 to control the operating status of the diesel engine 4 in real time and issue precise instructions. The threshing mechanism and the header conveying mechanism are electrically connected to the master controller 1 with the help of the electric drive unit to provide power support for its stable and efficient operation.

[0029] Mechanical connection: The power output end of the diesel engine 4 is connected to the fan device 5, the traveling mechanism and the generator 3 in sequence, wherein a clutch Ⅰ7 is arranged between the traveling mechanism and the diesel engine 4, and the existence of the clutch Ⅰ7 lays the foundation for the flexible switching of power transmission under different working conditions. The auger vibrating mechanism is connected to the power output end of the fan device 5 by transmission, realizing the relay transmission of power and ensuring the smooth progress of related operation processes.

[0030] The threshing mechanism and the header conveying mechanism are electrically connected to the master controller 1 through the electric drive unit. The power output end of the diesel engine 4 is connected to the fan device 5, the traveling mechanism and the generator 3 in sequence, and a clutch Ⅰ7 is provided between the traveling mechanism and the diesel engine 4; the auger vibrating screen mechanism is connected to the power output end of the fan device 5 by transmission.

[0031] This technical solution uses the diesel engine 4 as the initial power source, and its output power drives the generator 3 to operate. The generator 3 converts kinetic energy into electrical energy, which is then coordinated by the main controller 1 to store the electrical energy in the battery assembly 2. This process not only realizes the multi-dimensional conversion of energy, but also reserves resources for subsequent flexible electricity use. For loads with low power consumption and small changes such as the walking mechanism, the fan device 5, and the agitator vibrating mechanism, a method of direct connection with the diesel engine 4 is adopted to make full use of the stable power output of the diesel engine 4 to ensure its stable operation and reduce system complexity and energy consumption. Because the threshing mechanism has a large load and a large load impact, an electric drive unit is used to convert the stored electrical energy into kinetic energy, which effectively buffers the impact, accurately controls the operating parameters, and ensures the threshing quality. The load of the cutting table conveying mechanism is relatively medium and the impact is relatively medium. It also relies on the electric drive unit to realize the conversion drive from electrical energy to kinetic energy, taking into account both operating efficiency and stability.

[0032] The master controller 1, as the "brain" of the system, integrates key functions such as electric drive control, generator 3 control, battery assembly 2 control, and power conversion and distribution. It collects operating signals such as vehicle speed, load size, and speed of each part in real time, and dynamically adjusts the working status of the diesel engine 4, generator 3, and related mechanisms according to the preset control strategy, achieving automatic seamless switching of power drive modes under different working conditions.

[0033] Under normal load conditions: the diesel engine 4 drives the traveling mechanism and small loads (such as the fan device 5 and the auger vibrating mechanism) to operate, maintain the basic movement and auxiliary operation of the harvester, and at the same time drives the generator 3 to generate electricity, and the electric energy is stored in the battery assembly 2. The battery assembly 2 supplies power to the electric drive unit to drive the threshing mechanism and the header conveying mechanism. In this mode, the fuel economy of the diesel engine 4 is significantly improved, and efficient use of energy is achieved.

[0034] Under heavy load conditions: the diesel engine 4 fully drives the generator 3 to generate electricity, and the output power of the generator 3 cooperates with the power of the battery assembly 2 to supply power to the electric drive unit. When the harvester faces a sudden increase in feed volume and a sharp increase in the load of the header conveying mechanism and the threshing mechanism, this power supply mode can respond quickly, stabilize the speed of the threshing mechanism, and prevent the threshing quality from declining. At the same time, it stabilizes the speed of the diesel engine 4, prevents the running mechanism, the fan device 5 and the auger vibration mechanism from stalling, and ensures the overall operation continuity.

[0035] When the harvester is in transition, only the traveling mechanism is working. The system converts the generator 3 into the driving mode, disconnects the clutch Ⅰ7 between the traveling mechanism and the diesel engine 4, and the battery assembly 2 supplies power to the generator 3 to drive the traveling mechanism. At this time, it is in pure electric travel mode, which reduces fuel consumption and meets the low power consumption requirements during transition.

[0036] In summary, the hybrid power system of the combine harvester has comprehensively improved the operating efficiency, energy utilization and operation stability of the harvester under different working conditions through sophisticated structural design, intelligent control strategy and flexible power distribution, providing strong technical support for modern agricultural harvesting operations.

[0037] Example 2 This embodiment discloses a hybrid power system of a combine harvester, as a preferred implementation of the technical solution, that is, based on Example 1, its fan device 5 is connected to the diesel engine 4 through a first transmission unit, and the first transmission unit includes a first driving pulley 8, a first driven pulley 9 and a first transmission belt 10. The first driving pulley 8 is connected to the power output shaft of the diesel engine 4, the first driven pulley 9 is connected to the power input shaft of the fan device 5, and the first driven pulley 9 is connected to the first driving pulley 8 through the first transmission belt 10. This structure can effectively buffer the impact when the diesel engine 4 outputs power, ensure that the fan device 5 receives power smoothly and operates stably, and provide stable wind support for the cleaning and other links in the harvesting operation.

[0038] Example 3 This embodiment discloses a hybrid power system of a combine harvester, as a preferred implementation of the technical solution, that is, based on Example 2, its traveling mechanism includes a traveling assembly 11 and a second transmission unit, and the second transmission unit includes a second driving pulley 12, a second driven pulley 13 and a second transmission belt 14. The second driving pulley 12 is coaxially connected to the first driving pulley 8 through a clutch Ⅰ, and the power input shaft of the generator 3 is coaxially fixedly connected to the second driving pulley 12. This coaxial connection layout makes the power distribution more compact and efficient, and is convenient for quickly switching the power flow under different working conditions. The first driven pulley 9 is connected to the first driving pulley 8 through the first transmission belt 10, and the traveling assembly 11 is connected to the first driven pulley 9. The traveling mechanism can be directly driven by the power of the diesel engine 4, and can flexibly adjust the power source in a specific mode to ensure that the harvester can move flexibly in the field.

[0039] Example 4 The present embodiment discloses a hybrid power system of a combine harvester, which is a preferred implementation mode of the present technical solution, i.e., based on Embodiment 1, 2 or 3, and its auger vibrating mechanism includes a primary driving pulley 15, a primary driven pulley Ⅰ16, a primary driven pulley Ⅱ17, a primary transmission belt 18, a secondary driving pulley 19, a secondary driven pulley 20 and a secondary transmission belt 21.

[0040] The first-level driven pulley Ⅰ and the first-level driven pulley Ⅱ are connected to the first-level driving pulley 15 through the first-level transmission belt 18. The first-level driven pulley Ⅰ is connected to the grain auger 22, and the first-level driven pulley Ⅱ is connected to the debris auger 23. This double driven pulley design can accurately distribute power to the grain auger 22 and the debris auger 23 according to different material processing requirements, thereby improving the efficiency of material separation and screening.

[0041] The secondary active pulley 19 is coaxially fixedly connected with the primary driven pulley II, realizing seamless connection and transmission of power; the secondary driven pulley 20 is connected to the secondary active pulley 19 through the secondary transmission belt 21, and the secondary driven pulley 20 is connected with a vibrating screen 24. Through the two-stage transmission pulley combination, the power is smoothly transmitted to the vibrating screen 24, ensuring its stable vibration, effectively separating grains, debris and straw, etc., and ensuring the purity of grains after harvesting.

[0042] Example 5 This embodiment discloses a hybrid power system for a combine harvester, as a preferred implementation of the present technical solution, that is, based on Embodiment 1, 2, 3 or 4, its electric drive unit includes a drive motor I 25 and a drive motor II 26.

[0043] The threshing mechanism is electrically connected to the main controller 1 through the drive motor Ⅰ25. In this way, the main controller 1 can accurately control the drive motor Ⅰ to provide suitable electric energy for the threshing mechanism, drive it to operate stably, and effectively cope with the heavy load and impact during the threshing operation.

[0044] The header conveying mechanism is electrically connected to the master controller 1 through the drive motor II 26, so as to ensure that the header conveying mechanism obtains appropriate power through the drive motor II according to the operation requirements under the command of the master controller 1, so as to operate stably and efficiently.

[0045] Example 6 This embodiment discloses a hybrid power system of a combine harvester, as a preferred implementation of the technical solution, that is, based on Embodiment 1, 2, 3 or 4, its electric drive unit includes a main drive motor 27 and a clutch II 28. The main drive motor 27 is electrically connected to the main controller 1, and receives the power allocation instruction of the main controller 1. The threshing mechanism and the header conveying mechanism are connected to the main drive motor 27 through the clutch II. With the clutch function of the clutch II, the power transmission can be flexibly switched, and according to different working conditions, the main drive motor 27 can selectively and efficiently supply energy to the threshing mechanism and the header conveying mechanism.

[0046] Example 7 This embodiment discloses a hybrid power system of a combine harvester, as a preferred implementation of the technical solution, that is, based on any one of embodiments 1 to 6, its threshing mechanism includes a reducer 29 and a threshing drum 30, and the power input end of the reducer 29 is transmission-connected with the electric drive unit, and can reasonably reduce speed and increase torque according to the power output of the electric drive unit to adapt to the working requirements of the threshing drum 30. The threshing drum 30 is transmission-connected with the power output end of the reducer 29 through a clutch III, and the clutch characteristics of the clutch III can be used to flexibly control power transmission under special working conditions such as starting, stopping or overloading, protect the equipment and optimize operation.

[0047] Example 8 This embodiment discloses a hybrid power system of a combine harvester, as a preferred implementation of the technical solution, that is, based on any one of embodiments 1 to 6, its threshing mechanism includes a threshing drum 30 and a third transmission unit, and the third transmission unit includes a third driving pulley 32, a third driven pulley 33 and a third transmission belt 34. The third driving pulley 32 is connected to the electric drive unit in a transmission manner, and after receiving power, the third driven pulley 33 is driven to rotate through the third transmission belt 34. This pulley and belt transmission method has good buffering performance and can reduce power impact. The threshing drum 30 is connected to the third driven pulley 33 through a gear mechanism 35. The power input end of the gear mechanism 35 is connected, and the threshing drum 30 is connected to the power output end of the gear mechanism 35. The setting of the gear mechanism 35 facilitates power steering, and under the compact structural layout of the combine harvester, it is convenient to install the threshing drum 30 in a predetermined direction.

[0048] Example 9 This embodiment discloses a hybrid power system of a combine harvester, as a preferred implementation of the technical solution, that is, based on any one of embodiments 1 to 8, its header conveying mechanism includes a reel, a conveying sprocket 36 and a fourth transmission unit, and the fourth transmission unit includes a fourth driving pulley 37, a fourth driven pulley 38 and a fourth transmission belt 39. The fourth driving pulley 37 is connected to the electric drive unit for receiving power from the electric drive unit, and the fourth driven pulley 38 is connected to the fourth driving pulley 37 through the fourth transmission belt 39. This pulley belt transmission structure can effectively buffer the impact during the power transmission process and ensure the stability of power transmission. The reel and the conveying sprocket 36 are respectively connected to the fourth driven pulley 38, so as to obtain stable power to drive them to rotate. During the harvesting operation, the reel can accurately lift the crops and guide the cutter to ensure the smooth progress of the harvesting process and improve the harvesting efficiency; the harvested crops are transported to the threshing mechanism by the conveying sprocket 36.

Claims

1. A hybrid power system for a combine harvester, characterized in that: It comprises a master controller (1), a battery assembly (2), a generator (3), a threshing mechanism, a header conveying mechanism, a diesel engine (4), a traveling mechanism, a fan device (5) and an augers vibrating screen mechanism; The battery assembly (2) and the generator (3) are electrically connected to the main controller (1) respectively; the diesel engine (4) is electrically connected to the main controller (1) via the engine controller (6); the threshing mechanism and the header conveying mechanism are electrically connected to the main controller (1) via the electric drive unit; A first transmission unit is provided at the power output end of the diesel engine (4); the first transmission unit comprises a first driving pulley (8), a first driven pulley (9) and a first transmission belt (10); the first driving pulley (8) is connected to the power output shaft of the diesel engine (4), and the first driven pulley (9) is connected to the first driving pulley (8) via the first transmission belt (10); The power input end of the fan device (5) is connected to the first driven pulley (9), and the auger vibrating mechanism is drivingly connected to the power output end of the fan device (5); The generator (3) is connected to the first driving pulley (8) via a traveling mechanism, and a clutch I (7) is provided between the traveling mechanism and the first driving pulley (8).

2. A hybrid power system for a combine harvester as claimed in claim 1, characterized in that: The walking mechanism comprises a walking assembly (11) and a second transmission unit, and the second transmission unit comprises a second driving pulley (12), a second driven pulley (13) and a second transmission belt (14); the second driving pulley (12) is coaxially connected to the first driving pulley (8) via a clutch I (7), and the power input shaft of the generator (3) is coaxially fixedly connected to the second driving pulley (12); the first driven pulley (9) is transmission-connected to the first driving pulley (8) via a first transmission belt (10), and the walking assembly (11) is connected to the first driven pulley (9).

3. A hybrid power system for a combine harvester as claimed in claim 1, characterized in that: The agitator vibrating screen mechanism comprises a primary driving pulley (15), a primary driven pulley I (16), a primary driven pulley II (17), a primary transmission belt (18), a secondary driving pulley (19), a secondary driven pulley (20) and a secondary transmission belt (21); The primary driven pulley I (16) and the primary driven pulley II (17) are connected to the primary driving pulley (15) through a primary transmission belt (18); the primary driven pulley I (16) is connected to a seed agitator (22), and the primary driven pulley II (17) is connected to a miscellaneous agitator (23); The secondary driving pulley (19) is coaxially fixedly connected to the primary driven pulley II (17); the secondary driven pulley (20) is transmission-connected to the secondary driving pulley (19) via a secondary transmission belt (21); and a vibrating screen (24) is connected to the secondary driven pulley (20).

4. A hybrid power system for a combine harvester as claimed in claim 1, characterized in that: The electric drive unit comprises a drive motor I (25) and a drive motor II (26); the threshing mechanism is electrically connected to the main controller (1) via the drive motor I (25); and the harvesting platform conveying mechanism is electrically connected to the main controller (1) via the drive motor II (26).

5. A hybrid power system for a combine harvester as claimed in claim 1, characterized in that: The electric drive unit comprises a main drive motor (27) and a clutch II (28); the main drive motor (27) is electrically connected to the main controller (1); and the threshing mechanism and the harvesting platform conveying mechanism are transmission-connected to the main drive motor (27) via the clutch II (28).

6. A hybrid power system for a combine harvester as claimed in claim 1, characterized in that: The threshing mechanism comprises a reducer (29) and a threshing drum (30); the power input end of the reducer (29) is transmission-connected to the electric drive unit, and the threshing drum (30) is transmission-connected to the power output end of the reducer (29) via a clutch III (31).

7. A hybrid power system for a combine harvester as claimed in claim 1, characterized in that: The threshing mechanism comprises a threshing drum (30) and a third transmission unit, wherein the third transmission unit comprises a third driving pulley (32), a third driven pulley (33) and a third transmission belt (34); the third driving pulley (32) is transmission-connected to the electric drive unit, and the third driven pulley (33) is transmission-connected to the third driving pulley (32) via the third transmission belt (34); and the threshing drum (30) is connected to the third driven pulley (33) via a gear mechanism (35).

8. A hybrid power system for a combine harvester as claimed in claim 1, characterized in that: The harvesting platform conveying mechanism comprises a reel, a conveying sprocket (36) and a fourth transmission unit, wherein the fourth transmission unit comprises a fourth driving pulley (37), a fourth driven pulley (38) and a fourth transmission belt (39); the fourth driving pulley (37) is transmission-connected to the electric drive unit, and the fourth driven pulley (38) is transmission-connected to the fourth driving pulley (37) via a fourth transmission belt (39); the reel and the conveying sprocket (36) are respectively connected to the fourth driven pulley (38).

9. A control method for a hybrid power system of a combine harvester, characterized in that: Including normal load mode, heavy load mode and harvester transfer mode; In the normal load mode, the diesel engine (4) drives the walking mechanism, the fan device (5) and the auger vibrating mechanism to operate, so as to maintain the basic movement and auxiliary operation of the harvester; at the same time, the diesel engine (4) drives the generator (3) to generate electricity, and the electric energy is stored in the battery assembly (2); the battery assembly (2) supplies power to the electric drive unit to drive the threshing mechanism and the header conveying mechanism; The heavy load mode: when the harvester is faced with a sudden increase in the amount of feed, and the loads of the header conveying mechanism and the threshing mechanism increase sharply, the diesel engine (4) drives the generator (3) to generate electricity, and the output power of the generator (3) cooperates with the power of the battery assembly (2) to supply power to the electric drive unit; on this basis, the diesel engine (4) continuously outputs and the speed is stable, so that the travel mechanism, the fan device (5) and the auger vibration mechanism operate continuously; The harvester is in the field transfer mode: at this time, only the walking mechanism is working, and the main controller (1) switches the generator (3) to the driving mode, disconnects the clutch I (7) between the walking mechanism and the first transmission unit, and the battery assembly (2) supplies power to the generator (3) to drive the walking mechanism to operate.

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