Electric tractor power system, power control method and electric tractor

Abstract

The invention provides an electric tractor power system, a power control method and an electric tractor. The electric tractor power system comprises a power battery, a motor controller, a motor assembly, a PTO hydraulic gearbox and a walking driving gearbox. The motor assembly comprises a PTO hydraulic motor and a driving motor; the power battery is electrically connected with the PTO hydraulic motor and the driving motor through the motor controller. The PTO hydraulic motor is connected with a PTO hydraulic gearbox, and the PTO hydraulic gearbox is further connected with a hydraulic pump and a PTO output shaft. The driving motor is connected with the walking driving gearbox, and the walking driving gearbox is further connected with the front axle speed reduction structure and the rear axle speed reduction structure. The front axle deceleration structure is connected with tractor front wheels, and the rear axle deceleration structure is connected with tractor rear wheels. According to the power system of the electric tractor, the two motors provide power output for the whole tractor, the requirements for walking power, PTO power and hydraulic power are met at the same time, and the gearbox is simple in structure and low in cost.

Description

Technical Field

[0001] The present application relates to the technical field of new energy agricultural machinery, and in particular to an electric tractor power system, a power control method and an electric tractor. Background Art

[0002] With the increasing popularity of electrification in passenger cars, commercial vehicles, and construction machinery, electrification is also increasingly being used in tractors among agricultural machinery.

[0003] The primary challenge in electrifying tractors is meeting the three power requirements of the tractor: travel power, PTO power (with a rotary tiller, driven harrow, etc.), and hydraulic power (including hydraulic lifting, hydraulic steering, hydraulic braking, etc.). Travel power and PTO power must deliver full power at varying speeds, but motor characteristics are linearly proportional to speed below rated speed. Therefore, the inability to deliver full power when speed changes are achieved through motor speed regulation and the resulting power changes are key technical challenges hindering electrification.

[0004] To meet the vehicle's overall requirements for coordinated travel power, PTO power, and hydraulic power, various powertrain architectures have emerged for electric tractors, primarily employing separate drive arrangements for the travel motor, PTO motor, and hydraulic motor, or mixed drive arrangements. Separate drive arrangements involve a large number of motors and controllers, resulting in high costs and difficult coordination within the compact vehicle space. Mixed drive arrangements also lead to complex gear transmission systems, making control difficult and deviating from the simple transmission system required for electrification. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide an electric tractor power system, a power control method and an electric tractor, so as to solve at least one problem of the power architecture of the above-mentioned existing electric tractors.

[0006] To achieve the above-mentioned and other related objects, the present application provides, in a first aspect, an electric tractor power system, comprising: a power battery, a motor controller, a motor assembly, a PTO hydraulic transmission, and a travel drive transmission; wherein the motor assembly comprises: a PTO hydraulic motor and a drive motor; the power battery is electrically connected to the PTO hydraulic motor and the drive motor respectively through the motor controller; the PTO hydraulic motor is connected to the PTO hydraulic transmission, and the PTO hydraulic transmission is further connected to a hydraulic pump and a PTO output shaft respectively; the PTO hydraulic motor is used to provide power to the hydraulic pump through the PTO hydraulic transmission; the PTO hydraulic motor is also used to provide power to the PTO output shaft through the PTO hydraulic transmission; the drive motor is connected to the travel drive transmission, and the travel drive transmission is further connected to a front axle reduction structure and a rear axle reduction structure respectively; the front axle reduction structure is connected to the front wheels of the tractor, and the rear axle reduction structure is connected to the rear wheels of the tractor; the drive motor is used to provide power to the front wheels of the tractor through the travel drive transmission and the front axle reduction structure; the drive motor is also used to provide power to the rear wheels of the tractor through the travel drive transmission and the rear axle reduction structure.

[0007] In some embodiments of the first aspect of the present application, the PTO hydraulic transmission includes: a first reduction gear group and a second reduction gear group; wherein, the first reduction gear group includes: a first reduction driving gear and a first reduction driven gear that are meshed with each other; the second reduction gear group includes: a second reduction driving gear and a second reduction driven gear that are meshed with each other; the first reduction driving gear is connected to the PTO hydraulic motor through a first shaft, and the first reduction driven gear and the second reduction driving gear are sequentially sleeved and fixed on the second shaft; the second reduction driven gear is connected to the hydraulic pump through a third shaft; the PTO hydraulic motor transmits power to the hydraulic pump through the first reduction gear group and the second reduction gear group in sequence.

[0008] In some embodiments of the first aspect of the present application, the PTO hydraulic transmission further includes: a first PTO gear synchronizer, a PTO low-speed gear set, a PTO high-speed gear set, and a second PTO gear synchronizer; wherein the first PTO gear synchronizer is sleeved and fixed on the second shaft and the first PTO gear synchronizer is located behind the second reduction driving gear; the PTO low-speed gear set includes: a PTO low-speed driving gear and a PTO low-speed driven gear that are meshed with each other; the PTO high-speed gear set includes: a PTO high-speed driving gear and a PTO high-speed driven gear that are meshed with each other; the PTO low-speed The driving gear and the PTO high-speed driving gear are sequentially sleeved and fixed on one end of the fourth shaft; the PTO low-speed driven gear and the PTO high-speed driven gear are sequentially sleeved on the PTO output shaft; the other end of the fourth shaft is provided with a gear connection structure, and the gear connection structure can be engaged with the first PTO gear synchronizer; the second PTO gear synchronizer is sleeved and fixed on the PTO output shaft and is located between the PTO low-speed driven gear and the PTO high-speed driven gear; the second PTO gear synchronizer can be engaged with the PTO low-speed driven gear and the PTO high-speed driven gear respectively.

[0009] In some embodiments of the first aspect of the present application, the first PTO gear synchronizer and the second PTO gear synchronizer are used to switch different PTO modes; the PTO modes include: a PTO low-speed mode and a PTO high-speed mode; in the PTO low-speed mode, the first PTO gear synchronizer is engaged with the gear connection structure, and the second PTO gear synchronizer is engaged with the PTO low-speed driven gear; the hydraulic motor transmits power to the PTO output shaft through the first reduction gear set, the second reduction gear set, the first PTO gear synchronizer, the PTO low-speed gear set and the second PTO gear synchronizer in sequence; in the PTO high-speed mode, the first PTO gear synchronizer is engaged with the gear connection structure, and the second PTO gear synchronizer is engaged with the PTO high-speed driven gear; the hydraulic motor transmits power to the PTO output shaft through the first reduction gear set, the second reduction gear set, the first PTO gear synchronizer, the PTO high-speed gear set and the second PTO gear synchronizer in sequence.

[0010] In some embodiments of the first aspect of the present application, one end of the gear connection structure is fixedly connected to the other end of the fourth shaft, and the other end of the gear connection structure is provided with a connecting gear that can engage with the first PTO gear synchronizer.

[0011] In some embodiments of the first aspect of the present application, the travel drive gearbox includes: a travel reduction gear set, a first travel gear gear set, a second travel gear gear set, a third travel gear gear set, a first travel synchronizer and a second travel synchronizer; wherein the travel reduction gear set includes: a travel reduction driving gear and a travel reduction driven gear that are meshed with each other; the travel reduction driving gear is connected to the drive motor through a fifth shaft; the first travel gear gear set includes: a first travel gear driving gear and a first travel gear driven gear that are meshed with each other; the second travel gear gear set includes: a second travel gear driving gear and a second travel gear driven gear that are meshed with each other; the third travel gear gear set includes: a third travel gear driving gear gear, idler gear and third travel gear driven gear; the second travel synchronizer can be meshed with the third travel gear driven gear; the travel reduction driven gear, the first travel gear driving gear, the first travel synchronizer and the second travel gear driving gear are sequentially sleeved and fixed on the sixth shaft; the first travel synchronizer can be meshed with the first travel gear driving gear and the second travel gear driving gear respectively; the first travel gear driven gear, the second travel gear driven gear and the third travel gear driving gear are sequentially sleeved on the seventh shaft, and the seventh shaft is also connected to the rear axle reduction structure; the second travel synchronizer and the third travel gear driven gear are sequentially sleeved on one end of the eighth shaft, and the other end of the eighth shaft is connected to the front axle reduction structure.

[0012] In some embodiments of the first aspect of the present application, the rear axle reduction structure includes: a rear axle main reducer, a rear axle differential and a rear axle terminal reducer; the front axle reduction structure includes: a front axle main reducer, a front axle differential and a front axle terminal reducer.

[0013] In some embodiments of the first aspect of the present application, the first travel synchronizer or the second travel synchronizer is used to switch different travel modes: the travel modes include: driving operation mode, driving transport mode and four-wheel drive mode; in the driving operation mode, the first travel synchronizer is engaged with the first travel gear driving gear; the power output by the drive motor is sequentially transmitted to the rear wheels of the tractor through the travel reduction gear set, the first travel synchronizer, the first travel gear gear set, the rear axle main reducer, the rear axle differential and the rear axle terminal reducer; in the driving transport mode, the first travel synchronizer is engaged with the second travel gear The driving gears are engaged; the power output by the drive motor is sequentially transmitted to the rear wheels of the tractor through the travel reduction gear set, the first travel synchronizer, the second travel gear gear set, the rear axle main reducer, the rear axle differential and the rear axle terminal reducer; in the four-wheel drive mode, the first travel synchronizer is engaged with the first travel gear driving gear and the second travel synchronizer is engaged with the third travel gear driven gear; the power output by the drive motor is sequentially transmitted to the front wheels of the tractor through the travel reduction gear set, the first travel gear gear set, the third travel gear gear set, the front axle main reducer, the front axle differential and the front axle terminal reducer.

[0014] To achieve the above-mentioned and other related purposes, the second aspect of the present application provides an electric tractor power control method, which is applied to the electric tractor power system as described above. The method includes: obtaining the control requirements of the electric tractor power system; and controlling the gear position of the travel drive transmission and / or the PTO hydraulic transmission according to the control requirements of the electric tractor power system.

[0015] To achieve the above-mentioned object and other related objects, a third aspect of the present application provides an electric tractor, which includes: the electric tractor power system as described above.

[0016] As described above, the electric tractor power system, power control method, and electric tractor of the present application have the following beneficial effects:

[0017] The electric tractor power system of the present application is provided with vehicle power output by two motors, which meets the requirements of traveling power, PTO power and hydraulic power at the same time, and the gearbox structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic block diagram of an electric tractor power system in one embodiment of the present application.

[0019] Figure 2 Shown is a schematic diagram of the specific structure of the electric tractor power system in one embodiment of the present application.

[0020] Figure 3 Shown is a flow chart of a power control method for an electric tractor in one embodiment of the present application. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0022] In the embodiments of this application, terms such as "first" and "second" are used to distinguish between identical or similar items with substantially the same function or effect. For example, the terms "first travel synchronizer" and "second travel synchronizer" are used solely to distinguish between the two synchronizers and do not define their order of precedence. Those skilled in the art will understand that terms such as "first" and "second" do not define the number or order of execution, and do not necessarily imply that the terms are different.

[0023] It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" represent examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0024] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc or abc, where a, b, c can be single or multiple.

[0025] To facilitate understanding of the embodiments of this application, first Figure 1 Detailed description. Figure 1 The following is a schematic block diagram of an electric tractor power system according to an embodiment of the present invention. The electric tractor power system according to this embodiment includes:

[0026] Power battery 1, motor controller 2, motor assembly 3, PTO hydraulic gearbox 4 and travel drive gearbox 5;

[0027] The motor assembly 3 includes: a PTO hydraulic motor 31 and a drive motor 32; the power battery 1 is electrically connected to the PTO hydraulic motor 31 and the drive motor 32 through the motor controller 2;

[0028] The PTO hydraulic motor 31 is connected to the PTO hydraulic transmission 4, which is further connected to the hydraulic pump and the PTO output shaft. The PTO hydraulic motor 31 is used to provide power to the hydraulic pump through the PTO hydraulic transmission 4. The PTO hydraulic motor 31 is also used to provide power to the PTO output shaft through the PTO hydraulic transmission 4.

[0029] The drive motor 32 is connected to the travel drive gearbox 5, and the travel drive gearbox 5 is also connected to the front axle reduction structure and the rear axle reduction structure respectively; the front axle reduction structure is connected to the front wheels of the tractor, and the rear axle reduction structure is connected to the rear wheels of the tractor; the drive motor 32 is used to provide power to the front wheels of the tractor through the travel drive gearbox 5 and the front axle reduction structure; the drive motor 32 is also used to provide power to the rear wheels of the tractor through the travel drive gearbox and the rear axle reduction structure.

[0030] It should be understood that a hydraulic pump is an energy conversion device. It converts mechanical energy into hydraulic energy. The rotation of the pump generates pressure and flow in the hydraulic oil. The PTO output shaft can be connected to various agricultural implements on the tractor.

[0031] In one embodiment, if Figure 1 As shown, the electric tractor power system also includes a battery management system (BMS) 6 and a vehicle control unit (VCU) 7. The VCU is electrically connected to the BMS. It should be understood that a battery management system (BMS) is an electronic system used to manage and monitor battery packs. The VCU is responsible for coordinating and managing multiple vehicle subsystems (such as the engine, transmission, braking system, and body electronics) to achieve overall vehicle control and functional optimization.

[0032] In one embodiment, the motor controller converts the direct current output by the power battery into the three-phase alternating current required by the motor.

[0033] In one embodiment, if Figure 2 As shown, the PTO hydraulic transmission includes: a first reduction gear set, a second reduction gear set, a first PTO gear synchronizer, a PTO low-speed gear set, a PTO high-speed gear set and a second PTO gear synchronizer;

[0034] The first reduction gear set includes: a first reduction driving gear Z1 and a first reduction driven gear Z2 meshing with each other; the second reduction gear set includes: a second reduction driving gear Z3 and a second reduction driven gear Z4 meshing with each other;

[0035] The PTO hydraulic motor 31 is connected to one end of the first shaft 41, and the first reduction driving gear Z1 is mounted on and fixed to the other end of the first shaft 41. The first reduction driven gear Z2 is mounted on and fixed to one end of the second shaft 42, and the second reduction driving gear Z3 is mounted on and fixed to the second shaft 42, located behind the first reduction driven gear Z2. It should be noted that the terms "front and back" refer to the front and back directions of the PTO hydraulic motor's power transmission. The second reduction driven gear Z4 is mounted on and fixed to one end of the third shaft 43, the other end of which is connected to the hydraulic pump.

[0036] The power output by the PTO hydraulic motor 31 is transmitted to the hydraulic pump through the first and second reduction gear sets. Specifically, when the PTO hydraulic motor 31 rotates, it drives the first reduction driving gear Z1 via the first shaft 41. The first reduction driven gear Z2 follows the first reduction driving gear Z1, driving the second shaft 42, which in turn drives the second reduction driving gear Z3. The second reduction driven gear Z4 follows the second reduction driving gear Z3, which in turn drives the third shaft 43, providing mechanical energy for the hydraulic pump.

[0037] It should be noted that the two gears of the first reduction gear set are always in meshing engagement and the two gears of the second reduction gear set are always in meshing engagement, which ensures that the hydraulic power is not interrupted and provides power for hydraulic power requirements such as hydraulic steering.

[0038] In one embodiment, if Figure 2 As shown, the first PTO gear synchronizer 44 is mounted and fixed to the second shaft 42 and is located behind the second reduction drive gear Z3. It should be noted that the front and back represent the front and back of the PTO hydraulic motor power transmission direction. The PTO low-speed gear set includes: a PTO low-speed driving gear Z14 and a PTO low-speed driven gear Z15 that mesh with each other; the PTO high-speed gear set includes: a PTO high-speed driving gear Z16 and a PTO high-speed driven gear Z17 that mesh with each other;

[0039] The PTO low-speed driving gear Z14 and the PTO high-speed driving gear Z16 are sequentially sleeved and fixed on one end of the fourth shaft 45; the PTO low-speed driven gear Z15 and the PTO high-speed driven gear Z17 are sequentially sleeved on the PTO output shaft;

[0040] The other end of the fourth shaft is provided with a gear connection structure 46 , which can mesh with the first PTO gear synchronizer 44 ;

[0041] The second PTO gear synchronizer 47 is mounted on and fixed to the PTO output shaft; the second PTO gear synchronizer 47 is located between the PTO low-speed driven gear Z15 and the PTO high-speed driven gear Z17; the second PTO gear synchronizer 47 can be engaged with the PTO low-speed driven gear Z15 and the PTO high-speed driven gear Z17 respectively.

[0042] The first PTO gear synchronizer 44 and the second PTO gear synchronizer 47 are used to switch different PTO modes; the PTO modes include: a PTO low speed mode and a PTO high speed mode;

[0043] In the PTO low-speed mode, the first PTO gear synchronizer 44 is engaged with the gear connection structure 46, and the second PTO gear synchronizer 47 is engaged with the PTO low-speed driven gear Z15; the power output by the hydraulic motor is transmitted to the PTO output shaft in sequence through the first reduction gear set, the second reduction gear set, the first PTO gear synchronizer, the PTO low-speed gear set and the second PTO gear synchronizer;

[0044] Specifically, as long as the PTO hydraulic motor 31 is outputting power, the second shaft 42 will continue to rotate. In PTO low-speed mode, the second shaft 42 rotates, driving the first PTO gear synchronizer 44, which in turn drives the gear connection structure 46. The fourth shaft 45 rotates in conjunction with the gear connection structure 46, driving the PTO low-speed driving gear Z14. The PTO low-speed driven gear Z15 rotates in conjunction with the PTO low-speed driving gear Z14, driving the second PTO gear synchronizer 47, which in turn drives the PTO output shaft.

[0045] In the PTO high-speed mode, the first PTO gear synchronizer 44 is engaged with the gear connection structure 46, and the second PTO gear synchronizer 47 is engaged with the PTO high-speed driven gear Z17; the power output by the hydraulic motor is transmitted to the PTO output shaft in sequence through the first reduction gear group, the second reduction gear group, the first PTO gear synchronizer, the PTO high-speed gear group and the second PTO gear synchronizer.

[0046] Specifically, as long as the PTO hydraulic motor 31 is outputting power, the second shaft 42 will continue to rotate. In PTO high-speed mode, the rotation of the second shaft 42 drives the first PTO gear synchronizer 44, which in turn drives the gear connection structure 46. The fourth shaft 45 rotates in conjunction with the gear connection structure 46, driving the PTO high-speed driving gear Z16. The PTO high-speed driven gear Z17 rotates in conjunction with the PTO high-speed driving gear Z16, driving the second PTO gear synchronizer 47, which in turn drives the PTO output shaft.

[0047] It should be noted that those skilled in the art can select suitable synchronizers from existing synchronizers to serve as the first PTO gear synchronizer 44 and the second PTO gear synchronizer 47, and the present invention is not limited thereto. It should also be noted that the speed of the PTO output shaft in the PTO low-speed mode is lower than the speed of the PTO output shaft in the PTO high-speed mode. The PTO low-speed gear set and the PTO high-speed gear set have different transmission ratios to achieve different speeds for the PTO output shaft.

[0048] In one embodiment, both the PTO low-speed driven gear Z15 and the PTO high-speed driven gear Z17 are double gears.

[0049] In one embodiment, if Figure 2 As shown, the gear connection structure includes: a connecting pipe; a fixing piece is provided at one end of the connecting pipe, the connecting pipe is fixedly connected to the other end of the fourth shaft through the fixing piece, and the other end of the connecting pipe is fixed with a connecting gear that can mesh with the first PTO gear position device.

[0050] In one embodiment, if Figure 2 As shown, the travel drive gearbox includes: a travel reduction gear set, a first travel gear gear set, a second travel gear gear set, a third travel gear gear set, a first travel synchronizer and a second travel synchronizer;

[0051] The travel reduction gear set includes: a travel reduction driving gear Z5 and a travel reduction driven gear Z6 that mesh with each other; the travel reduction driving gear Z5 is fixed to one end of the fifth shaft 51, and the other end of the fifth shaft 51 is connected to the drive motor 32;

[0052] The first travel gear gear set includes: a first travel gear driving gear Z7 and a first travel gear driven gear Z8 that are meshed with each other; the second travel gear gear set includes: a second travel gear driving gear Z9 and a second travel gear driven gear Z10 that are meshed with each other; the third travel gear gear set includes: a third travel gear driving gear Z11, an idler gear Z12, and a third travel gear driven gear Z13;

[0053] The travel speed reduction driven gear Z6, the first travel gear driving gear Z7, the first travel synchronizer 52, and the second travel gear driving gear Z9 are sequentially sleeved on the sixth shaft 53; the travel speed reduction driven gear Z6 is fixed to one end of the sixth shaft 53, and the first travel synchronizer 52 is fixed to the sixth shaft 53; the first travel synchronizer can mesh with the first travel gear driving gear Z7 and the second travel gear driving gear Z9 respectively;

[0054] The first travel gear driven gear Z8, the second travel gear driven gear Z10 and the third travel gear driving gear Z11 are sequentially mounted and fixed on the seventh shaft 54, and the seventh shaft 54 ​​is also connected to the rear axle reduction structure; the third travel gear driven gear Z13 can be engaged with the second travel synchronizer 55, the second travel synchronizer 55 and the third travel gear driven gear Z13 are sequentially mounted on one end of the eighth shaft 56 and the second travel synchronizer 55 is fixed to the eighth shaft 56, and the other end of the eighth shaft 56 is connected to the front axle reduction structure.

[0055] It should be noted that the section from the third travel gear set to the front and rear axle reduction gears is the same structure as in conventional fuel tractors. The design of the PTO hydraulic transmission and the drive travel transmission minimizes transmission variations, facilitating the electrification of fuel tractors. The PTO hydraulic transmission and the drive travel transmission utilize fully externally meshed cylindrical gears to transmit power for two travel gears, PTO output, and hydraulic output, simplifying the transmission path and ensuring that cylindrical gears are easy to manufacture and low-cost.

[0056] In one embodiment, if Figure 2 As shown, the rear axle reduction structure includes: rear axle main reducer, rear axle differential and two rear axle terminal reducers; the two rear axle terminal reducers are respectively connected to the rear drive wheels of the tractor; the front axle reduction structure includes: front axle main reducer, front axle differential and two front axle terminal reducers; the two front axle terminal reducers are respectively connected to the front drive wheels of the tractor. It should be noted that Figure 2 What is shown is the positional relationship between the front axle reduction structure and the power battery. The front axle reduction structure and the power battery have no connection relationship.

[0057] It should be understood that the main function of the rear axle final reducer is to decelerate and increase torque from the power transmitted by the universal joint, and to change the direction of power transmission. The rear axle differential is installed at the end of the rear axle final reducer. Its main function is to allow the left and right wheels to rotate at different speeds, thereby ensuring that the vehicle can travel smoothly when turning, while also distributing power to the two drive wheels. The main function of the rear axle terminal reducer is to reduce speed and increase torque. The main function of the front axle final reducer is to decelerate and increase torque from the power transmitted by the universal joint, and to change the direction of power transmission. The front axle differential is installed at the end of the front axle final reducer. Its main function is to allow the left and right wheels to rotate at different speeds, thereby ensuring that the vehicle can travel smoothly when turning, while also distributing power to the two drive wheels. The main function of the front axle terminal reducer is to reduce speed and increase torque.

[0058] In one embodiment, if Figure 2 As shown, the first travel synchronizer and the second travel synchronizer are used to switch different travel modes: the travel modes include: driving operation mode, driving transportation mode and four-wheel drive mode;

[0059] In the driving operation mode, the first travel synchronizer 52 is engaged with the first travel gear driving gear Z7; the power output by the drive motor 32 is transmitted to the rear wheels of the tractor in sequence through the travel reduction gear set, the first travel synchronizer, the first travel gear gear set, the rear axle final reducer, the rear axle differential and the rear axle final reducer;

[0060] Specifically, the drive motor 32 rotates the travel speed reduction driving gear Z5 via the fifth shaft 51. The travel speed reduction driven gear Z6 rotates in response to the travel speed reduction driving gear Z5, which in turn drives the first travel synchronizer 52 to rotate via the sixth shaft 53. The first travel synchronizer 52 rotates the first travel gear driving gear Z7, which in turn drives the first travel gear driven gear Z8 to rotate in response to the first travel gear driving gear Z7, which in turn drives the seventh shaft 54 ​​to rotate. The power output from the seventh shaft 54 ​​is sequentially transmitted to the rear axle main reducer, rear axle differential, rear axle terminal reducer, and the tractor's rear wheels.

[0061] In the driving transport mode, the first travel synchronizer 52 is engaged with the second travel gear driving gear Z9; the power output by the drive motor 32 is transmitted to the rear wheels of the tractor through the travel reduction gear set, the first travel synchronizer, the second travel gear gear set, the rear axle final reducer, the rear axle differential and the rear axle final reducer in sequence;

[0062] Specifically, the drive motor 32 rotates the travel speed reduction driving gear Z5 via the fifth shaft 51. The travel speed reduction driven gear Z6 rotates in response to the travel speed reduction driving gear Z5, which in turn drives the first travel synchronizer 52 to rotate via the sixth shaft 53. The first travel synchronizer 52 rotates the second travel gear driving gear Z9, which in turn drives the second travel gear driven gear Z10 to rotate in response to the second travel gear driving gear Z9, which in turn drives the seventh shaft 54 ​​to rotate. The power output from the seventh shaft 54 ​​is sequentially transmitted to the rear axle main reducer, rear axle differential, rear axle terminal reducer, and the tractor's rear wheels.

[0063] In a four-wheel drive mode, the first travel synchronizer 52 is engaged with the first travel gear driving gear Z7; the second travel synchronizer 55 is engaged with the third travel gear driven gear Z13; the power output by the drive motor 32 is transmitted to the third travel gear gear set in sequence through the travel reduction gear set and the first travel gear gear set; a part of the power output by the third travel gear gear set is transmitted to the front wheels of the tractor in sequence through the front axle main reducer, the front axle differential and the front axle terminal reducer; the other part of the power output by the third travel gear gear set is transmitted to the rear wheels of the tractor in sequence through the rear axle main reducer, the rear axle differential and the rear axle terminal reducer.

[0064] Specifically, the drive motor 32 rotates the travel speed reduction driving gear Z5 via the fifth shaft 51. The travel speed reduction driven gear Z6 follows the travel speed reduction driving gear Z5, which in turn drives the first travel synchronizer 52 via the sixth shaft 53. The first travel synchronizer drives the first travel gear driving gear Z7. The first travel gear driven gear Z8 follows the first travel gear driving gear Z7, which in turn drives the seventh shaft 54. The third travel gear driving gear Z11 follows the seventh shaft 54, which in turn drives the idler gear Z12 and the third travel gear driven gear Z13. The eighth shaft 56 follows the third travel gear driven gear Z13. The power output from the seventh shaft 54 ​​is sequentially transmitted to the rear axle final drive, rear axle differential, rear axle final drive, and the rear drive wheels of the tractor. The power output from the eighth shaft 56 is sequentially transmitted to the front axle final drive, front axle differential, front axle final drive, and the front drive wheels.

[0065] In another four-wheel drive mode, the first travel synchronizer 52 is engaged with the second travel gear driving gear Z9; the second travel synchronizer 55 is engaged with the third travel gear driven gear Z13; the power output by the drive motor 31 is transmitted to the third travel gear gear set in sequence through the travel reduction gear set and the second travel gear gear set; a part of the power output by the third travel gear gear set is transmitted to the front wheels of the tractor in sequence through the front axle main reducer, the front axle differential and the front axle terminal reducer; the other part of the power output by the third travel gear gear set is transmitted to the rear wheels of the tractor in sequence through the rear axle main reducer, the rear axle differential and the rear axle terminal reducer.

[0066] Specifically, the drive motor 32 rotates the travel speed reduction driving gear Z5 via the fifth shaft 51. The travel speed reduction driven gear Z6 follows the travel speed reduction driving gear Z5, which in turn drives the first travel synchronizer 52 via the sixth shaft 53. The first travel synchronizer drives the second travel gear driving gear Z9. The second travel gear driven gear Z10 follows the second travel gear driving gear Z9, which in turn drives the seventh shaft 54. The third travel gear driving gear Z11 follows the seventh shaft 54, which in turn drives the idler gear Z12 and the third travel gear driven gear Z13. The eighth shaft 56 follows the third travel gear driven gear Z13. The power output from the seventh shaft 54 ​​is sequentially transmitted to the rear axle final drive, rear axle differential, rear axle final drive, and the tractor's rear drive wheels. The power output from the eighth shaft 56 is sequentially transmitted to the front axle final drive, front axle differential, front axle final drive, and the front drive wheels.

[0067] It should be noted that those skilled in the art can select suitable synchronizers from existing synchronizers as the first travel synchronizer 52 and the second travel synchronizer 55, and the present invention is not limited thereto. It should also be noted that the transmission ratios of the second travel gear set and the third travel gear set are different.

[0068] In a specific embodiment, the first travel gear driving gear (gear 7) and the second travel gear driving gear (gear 9) are both double gears.

[0069] In one embodiment, if Figure 2 As shown, the PTO hydraulic transmission is equipped with a PTO hydraulic shifter 48, an AMT shifter that controls whether the first PTO gear synchronizer 44 engages with the gear connection structure. The travel drive transmission is equipped with a travel drive shifter 57, an AMT shifter that controls whether the first travel synchronizer engages with the first travel gear driving gear Z7 and the second travel gear driving gear Z9, respectively. It should be noted that the coordination between the synchronizer and the AMT shifter enables seamless shifting, improving operational efficiency.

[0070] In one embodiment, the second PTO gear synchronizer 47 and the second travel synchronizer 55 are controlled by a manual shifter.

[0071] It should be noted that both the AMT (Automated Mechanical Transmission) shifter and the manual shifter can adopt existing structures.

[0072] The present invention uses a drive motor to drive the tractor via the accelerator pedal to achieve acceleration, steady-state, and deceleration conditions. The PTO hydraulic motor delivers hydraulic power and PTO output, achieving the steady-state speed requirements of the PTO shaft and low-energy hydraulic power consumption. This dual-motor system achieves the travel, PTO, and hydraulic power requirements that conventional three-motor systems typically require, and resolves the existing problem of dual-motor systems lacking hydraulic output.

[0073] In one embodiment, if Figure 1 As shown, the AMT shifter is controlled by the vehicle controller.

[0074] Figure 3 FIG. 1 is a flow chart of the electric tractor power control method provided in the embodiment of the present application. Figure 3 As shown, the electric tractor power control method is applied to the electric tractor power system as described above, comprising:

[0075] Step S31: Obtaining the electric tractor power system control requirements.

[0076] In one embodiment, the types of control requirements of the electric tractor power system include but are not limited to PTO low speed requirements, PTO high speed requirements, driving operation requirements, driving transportation requirements, four-wheel drive requirements, etc.

[0077] Step S32: performing gear control on the travel drive gearbox or the PTO hydraulic gearbox according to the control requirements of the electric tractor power system.

[0078] In one embodiment, if Figure 2 As shown, according to the control requirements of the electric tractor power system, the gear control of the travel drive transmission or the PTO hydraulic transmission mainly includes:

[0079] If the electric tractor power system control demand is a PTO low speed demand, the first PTO gear synchronizer 44 is controlled to engage with the gear connection structure 42 (gear 1), and the second PTO gear synchronizer 47 is controlled to engage with the PTO low speed driven gear Z15 (gear 5).

[0080] If the electric tractor power system control demand is a PTO high speed demand, the first PTO gear synchronizer 44 is controlled to engage with the gear connection structure 42 (gear 1), and the second PTO gear synchronizer 47 is controlled to engage with the PTO high speed driven gear Z17 (gear 6).

[0081] If the control demand of the electric tractor power system is a driving operation demand, the first travel synchronizer 52 is controlled to engage with the first travel gear driving gear Z7 (gear 2);

[0082] If the control demand of the electric tractor power system is driving and transporting demand, the first travel synchronizer 52 is controlled to be engaged with the second travel gear driving gear Z9 (gear 3);

[0083] If the control requirement of the electric tractor power system is a four-wheel drive requirement, the first travel synchronizer 52 is controlled to engage the first travel gear driving gear Z7 or the second travel gear driving gear Z9 (gear 2 or gear 3), and the second travel synchronizer 55 is controlled to engage the second travel synchronizer 55 with the third travel gear driven gear Z13 (gear 5).

[0084] The present invention further provides an electric tractor, which includes the electric tractor power system described above. It should be noted that since the electric tractor power system has been described in the above embodiments, it will not be described again here.

[0085] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0086] In summary, the present application provides an electric tractor power system, a power control method and an electric tractor. The electric tractor power system includes: a power battery, a motor controller, a motor assembly, a PTO hydraulic gearbox and a travel drive gearbox; the motor assembly includes: a PTO hydraulic motor and a drive motor; the power battery is electrically connected to the PTO hydraulic motor and the drive motor respectively through the motor controller; the PTO hydraulic motor is connected to the PTO hydraulic gearbox, and the PTO hydraulic gearbox is also connected to the hydraulic pump and the PTO output shaft respectively; the drive motor is connected to the travel drive gearbox, and the travel drive gearbox is also connected to the front axle reduction structure and the rear axle reduction structure respectively; the front axle reduction structure is connected to the front wheels of the tractor, and the rear axle reduction structure is connected to the rear wheels of the tractor. The electric tractor power system of the present application uses two motors to provide vehicle power output, while meeting the needs of travel power, PTO power and hydraulic power, and the gearbox structure is simple and the cost is low. Therefore, the present application effectively overcomes the various shortcomings of the prior art and has high industrial utilization value.

[0087] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. An electric tractor power system, characterized in that: include: Power battery, motor controller, motor assembly, PTO hydraulic gearbox and travel drive gearbox; Wherein, the motor assembly includes: a PTO hydraulic motor and a drive motor; the power battery is electrically connected to the PTO hydraulic motor and the drive motor respectively through the motor controller; The PTO hydraulic motor is connected to the PTO hydraulic gearbox, and the PTO hydraulic gearbox is also connected to the hydraulic pump and the PTO output shaft respectively; the PTO hydraulic motor is used to provide power to the hydraulic pump through the PTO hydraulic gearbox; the PTO hydraulic motor is also used to provide power to the PTO output shaft through the PTO hydraulic gearbox; The drive motor is connected to the travel drive gearbox, and the travel drive gearbox is also connected to the front axle reduction structure and the rear axle reduction structure respectively; the front axle reduction structure is connected to the front wheels of the tractor, and the rear axle reduction structure is connected to the rear wheels of the tractor; the drive motor is used to provide power to the front wheels of the tractor through the travel drive gearbox and the front axle reduction structure; the drive motor is also used to provide power to the rear wheels of the tractor through the travel drive gearbox and the rear axle reduction structure.

2. The electric tractor power system according to claim 1, characterized in that: The PTO hydraulic transmission includes: a first reduction gear set and a second reduction gear set; Wherein, the first reduction gear set includes: a first reduction driving gear and a first reduction driven gear meshing with each other; the second reduction gear set includes: a second reduction driving gear and a second reduction driven gear meshing with each other; the first reduction driving gear is connected to the PTO hydraulic motor through a first shaft, and the first reduction driven gear and the second reduction driving gear are sequentially sleeved and fixed on the second shaft; the second reduction driven gear is connected to the hydraulic pump through a third shaft; The PTO hydraulic motor transmits power to the hydraulic pump through the first reduction gear set and the second reduction gear set in sequence.

3. The electric tractor power system according to claim 2, characterized in that: The PTO hydraulic transmission further includes: a first PTO gear synchronizer, a PTO low-speed gear set, a PTO high-speed gear set and a second PTO gear synchronizer; wherein, The first PTO gear synchronizer is sleeved and fixed on the second shaft and is located behind the second reduction driving gear; The PTO low-speed gear set includes: a PTO low-speed driving gear and a PTO low-speed driven gear meshing with each other; The PTO high-speed gear set includes: a PTO high-speed driving gear and a PTO high-speed driven gear meshing with each other; The PTO low-speed driving gear and the PTO high-speed driving gear are sequentially sleeved and fixed on one end of the fourth shaft; The PTO low-speed driven gear and the PTO high-speed driven gear are sequentially sleeved on the PTO output shaft; The other end of the fourth shaft is provided with a gear connection structure, and the gear connection structure can be engaged with the first PTO gear synchronizer; The second PTO gear synchronizer is sleeved and fixed on the PTO output shaft and is located between the PTO low-speed driven gear and the PTO high-speed driven gear; the second PTO gear synchronizer can be engaged with the PTO low-speed driven gear and the PTO high-speed driven gear respectively.

4. The electric tractor power system according to claim 3, characterized in that: The first PTO gear synchronizer and the second PTO gear synchronizer are used to switch different PTO modes; the PTO modes include: a PTO low speed mode and a PTO high speed mode; In the PTO low-speed mode, the first PTO gear synchronizer is engaged with the gear connection structure, and the second PTO gear synchronizer is engaged with the PTO low-speed driven gear; the hydraulic motor transmits power to the PTO output shaft in sequence through the first reduction gear set, the second reduction gear set, the first PTO gear synchronizer, the PTO low-speed gear set, and the second PTO gear synchronizer; In the PTO high-speed mode, the first PTO gear synchronizer is engaged with the gear connection structure, and the second PTO gear synchronizer is engaged with the PTO high-speed driven gear; the hydraulic motor transmits power to the PTO output shaft through the first reduction gear group, the second reduction gear group, the first PTO gear synchronizer, the PTO high-speed gear group and the second PTO gear synchronizer in sequence.

5. The electric tractor power system according to claim 4, characterized in that: One end of the gear connection structure is fixedly connected to the other end of the fourth shaft, and the other end of the gear connection structure is provided with a connecting gear that can mesh with the first PTO gear synchronizer.

6. The electric tractor power system according to claim 1, characterized in that: The travel drive gearbox includes: a travel reduction gear set, a first travel gear set, a second travel gear set, a third travel gear set, a first travel synchronizer and a second travel synchronizer; The travel reduction gear set includes a travel reduction driving gear and a travel reduction driven gear that mesh with each other; The travel speed reduction driving gear is connected to the drive motor via a fifth shaft; The first travel gear set includes: a first travel gear driving gear and a first travel gear driven gear meshing with each other; the second travel gear set includes: a second travel gear driving gear and a second travel gear driven gear meshing with each other; the third travel gear set includes: a third travel gear driving gear, an idler gear, and a third travel gear driven gear; the second travel synchronizer can mesh with the third travel gear driven gear; The travel speed reduction driven gear, the first travel gear driving gear, and the first travel synchronizer and the second travel gear driving gear are sequentially sleeved and fixed on the sixth shaft; the first travel synchronizer can be engaged with the first travel gear driving gear and the second travel gear driving gear respectively; The first travel gear driven gear, the second travel gear driven gear and the third travel gear driving gear are sequentially sleeved on the seventh shaft, and the seventh shaft is also connected to the rear axle reduction structure; the second travel synchronizer and the third travel gear driven gear are sequentially sleeved on one end of the eighth shaft, and the other end of the eighth shaft is connected to the front axle reduction structure.

7. The electric tractor power system according to claim 5, characterized in that: The rear axle reduction gear structure includes: a rear axle main reducer, a rear axle differential and a rear axle terminal reducer; the front axle reduction gear structure includes: a front axle main reducer, a front axle differential and a front axle terminal reducer.

8. The electric tractor power system according to claim 6, characterized in that: The first travel synchronizer or the second travel synchronizer is used to switch different travel modes: the travel modes include: driving operation mode, driving transportation mode and four-wheel drive mode; In the driving operation mode, the first travel synchronizer is engaged with the first travel gear driving gear; the power output by the drive motor is transmitted to the rear wheels of the tractor in sequence through the travel reduction gear set, the first travel synchronizer, the first travel gear gear set, the rear axle final reducer, the rear axle differential and the rear axle final reducer; In the driving transport mode, the first travel synchronizer is engaged with the second travel gear driving gear; the power output by the drive motor is transmitted to the rear wheels of the tractor in sequence through the travel reduction gear set, the first travel synchronizer, the second travel gear gear set, the rear axle final reducer, the rear axle differential and the rear axle final reducer; In the four-wheel drive mode, the first travel synchronizer is engaged with the first travel gear driving gear and the second travel synchronizer is engaged with the third travel gear driven gear; the power output by the drive motor is sequentially transmitted to the front wheels of the tractor through the travel reduction gear set, the first travel gear gear set, the third travel gear gear set, the front axle main reducer, the front axle differential and the front axle terminal reducer.

9. A power control method for an electric tractor, characterized in that: The method is applied to the electric tractor power system according to any one of claims 1 to 8, and the method comprises: Obtain the control requirements of the electric tractor power system; According to the control requirements of the electric tractor power system, the gear position of the travel drive gearbox and / or the PTO hydraulic gearbox is controlled.

10. An electric tractor, characterized in that: The electric tractor comprises: an electric tractor power system according to any one of claims 1 to 8.

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