A high-horsepower hybrid tractor drive system and control method

Abstract

The present invention provides a high-horsepower hybrid tractor drive system and control method, comprising an engine, a generator, a battery pack, a main drive motor, a PTO drive motor, and a mechanical coupling device. The engine is connected to the generator, whose output power is electrically connected to the battery pack, the main drive motor, and the PTO drive motor via an inverter. The generator, the main drive motor, and the PTO drive motor are each connected to the mechanical coupling device, whose two output ends are connected to a transmission and a rear power take-off device, respectively. The transmission is connected to a drive axle, which is connected to a vehicle half-axle for driving the wheels. This invention can meet the complex operating conditions of a tractor, while ensuring good fuel economy and emissions while also taking into account the advantages of high power performance and high compatibility with agricultural machinery.

Description

Technical Field

[0001] The present invention relates to the field of agricultural machinery, and in particular to a high-horsepower hybrid power tractor drive system and a control method. Background Art

[0002] As agricultural planting becomes increasingly large-scale and clustered, the use of high-horsepower tractors is growing. Traditional high-horsepower fuel tractors suffer from numerous issues, including low efficiency, complex structure, excessive gears, high fuel consumption, and poor emissions, making them extremely unfriendly to energy and the environment. Therefore, energy-saving and environmentally friendly tractors are becoming a development trend. Major new energy tractors include pure electric tractors and hybrid tractors. While electric tractors offer advantages such as high efficiency and zero emissions, they are limited by battery technology and cannot meet the long-range operating requirements of tractors. Hybrid tractors can effectively reduce emissions and improve efficiency while meeting various operating requirements. Furthermore, hybrid technology is widely used in automobiles, making hybrid tractors the best choice for today's new high-horsepower tractors.

[0003] The operating conditions of high-horsepower tractors are extremely complex, and they have high requirements for torque and traction performance. The existing hybrid tractor drive systems generally cannot meet the high degree of working condition matching, cannot take into account both power and economy, have low energy utilization, and poor fuel economy. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the present invention provides a high-horsepower hybrid tractor drive system and control method, which can meet the complex working conditions of the tractor, while ensuring good fuel economy and emissions, and taking into account the advantages of strong power and high agricultural machinery matching.

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A high-horsepower hybrid tractor drive system includes an engine, a generator, a battery pack, a main drive motor, a PTO drive motor and a mechanical coupling device;

[0007] The engine is connected to a generator, and the output power of the generator is electrically connected to the battery pack, the main drive motor and the PTO drive motor through an inverter. The generator, the main drive motor and the PTO drive motor are respectively connected to a mechanical coupling device, and the two output ends of the mechanical coupling device are respectively connected to the transmission and the rear power output device; the transmission is connected to the drive axle, and the drive axle is connected to the vehicle half-axle for driving the wheels.

[0008] Further, the mechanical coupling device includes a first power transmission shaft, a second power transmission shaft, a third power transmission shaft, a planetary gear mechanism, a shift synchronizer, a connector T, a locker B and a clutch assembly;

[0009] One end of the first power transmission shaft is connected to the main drive motor, and the other end of the first power transmission shaft is connected to the second power transmission shaft through a first gear pair; one end of the second power transmission shaft is connected to the generator; the other end of the second power transmission shaft is connected to the transmission; one end of the third power transmission shaft is connected to the PTO drive motor, and the other end of the third power transmission shaft is connected to the rear power output device; the planetary gear mechanism includes a sun gear, a planet carrier and a ring gear; the sun gear is mounted on the second power transmission shaft;

[0010] The clutch assembly includes a C1 clutch, a C2 clutch, a C3 clutch, and a C4 clutch; the C1 clutch is used to selectively connect the second power transmission shaft to the first power transmission shaft; the C2 clutch is used to selectively connect the generator to the sun gear; the C3 clutch is used to selectively connect the planetary carrier to the transmission; the C4 clutch is used to selectively connect the PTO drive motor to the rear power take-off device;

[0011] The shift synchronizer is used to selectively connect the third power transmission shaft with the ring gear or the third power transmission shaft with the second power transmission shaft; the locker B is used to connect the ring gear with the fixing member; the connector T is used to selectively connect the first power transmission shaft with the second power transmission shaft.

[0012] Furthermore, by selectively controlling the engagement of the shift synchronizer, locker B and clutch assembly, a transmission mode is provided between the generator or main drive motor or PTO drive motor or main drive motor and PTO drive motor or generator, main drive motor and PTO drive motor and the rear power output device and / or transmission: pure electric drive mode, hybrid drive mode and engine drive mode.

[0013] Furthermore, the pure electric driving mode includes a single motor driving mode, a dual motor torque coupling driving mode, a dual motor speed coupling driving mode and a dual motor speed and torque coupling driving mode.

[0014] Selectively controlling the connector T, the C3 clutch, and the lock B to engage, providing a single-motor drive mode between the main drive motor and the transmission;

[0015] Selectively controlling the engagement of the C1 clutch provides another single-motor drive mode between the main drive motor and the transmission;

[0016] Selectively control the engagement of the C4 clutch to provide a single-motor drive mode between the PTO drive motor and the rear power take-off device;

[0017] selectively controlling the C1 clutch to engage, and selectively controlling the shift synchronizer to connect the third power transmission shaft with the second power transmission shaft, providing a dual-motor torque coupling drive mode between the main drive motor and the PTO drive motor and the transmission;

[0018] selectively controlling the connector T and the C3 clutch to engage, and selectively controlling the shift synchronizer to connect the third power transmission shaft to the ring gear, providing a dual-motor speed coupling drive mode between the main drive motor and the PTO drive motor and the transmission;

[0019] selectively controlling the connector T, the C3 clutch, and the C1 clutch to engage, and selectively controlling the shift synchronizer to connect the third power transmission shaft with the second power transmission shaft, providing a dual-motor speed and torque coupling drive mode between the main drive motor and the PTO drive motor and the transmission;

[0020] In any of the dual-motor torque coupling drive mode, dual-motor speed coupling drive mode and dual-motor speed and torque coupling drive mode, the C4 clutch is selectively controlled to engage to provide a transmission mode between the main drive motor and the PTO drive motor and the rear power take-off device and the transmission.

[0021] Furthermore, the hybrid driving mode includes a series charging mode, a series hybrid mode and a parallel hybrid mode;

[0022] In any one of the dual-motor torque coupling drive mode, the dual-motor speed coupling drive mode, and the dual-motor speed and torque coupling drive mode, the engine drives the generator to generate electrical energy, and the generated electrical energy is input into the main drive motor and the PTO drive motor to form a series hybrid mode;

[0023] In any one of the dual-motor torque coupling drive mode, the dual-motor speed coupling drive mode, and the dual-motor speed and torque coupling drive mode, the engine drives the generator to generate electrical energy, a portion of the generated electrical energy is input into the main drive motor and the PTO drive motor, and another portion of the generated electrical energy is input into the battery pack to form a series charging mode;

[0024] selectively controlling the C2 clutch, the C3 clutch, the C1 clutch, and the locker B to engage, and selectively controlling the shift synchronizer to connect the third power transmission shaft with the second power transmission shaft, thereby providing a parallel hybrid mode between the generator, the main drive motor, the PTO drive motor, and the transmission;

[0025] Selectively controlling the engagement of the C2 clutch, the C3 clutch, the C1 clutch, the C4 clutch and the lock B, and selectively controlling the shift synchronizer to connect the third power transmission shaft with the second power transmission shaft, provides a parallel hybrid mode between the generator, the main drive motor and the PTO drive motor and the transmission and the rear power output device.

[0026] Further, the C2 clutch, the C3 clutch, and the lock B are selectively controlled to engage, providing an engine drive mode between the generator and the transmission;

[0027] The C2 clutch, the C3 clutch, the C4 clutch and the lock B are selectively controlled to engage, and the shift synchronizer is selectively controlled to connect the third power transmission shaft with the second power transmission shaft, providing an engine drive mode between the generator, the transmission and the rear power output device.

[0028] A control method for a high-horsepower hybrid tractor drive system comprises the following steps:

[0029] Obtain the load size through the sensor and determine whether the current load is light, medium or heavy; obtain the SOC value of the battery pack;

[0030] When the SOC value of the battery pack is greater than SOC max When the SOC value of the battery pack is SOC min and SOC max When the tractor is lightly loaded, it operates in pure electric drive mode;

[0031] When the SOC value of the battery pack is SOC min and SOC max When the tractor is working in medium or heavy load, the hybrid drive mode is used;

[0032] When the SOC value of the battery pack is less than SOC min When the engine is driven, the vehicle works in engine driving mode.

[0033] Furthermore, the method further includes the following steps: obtaining the speed V of the tractor through a sensor; when the SOC value of the battery pack is greater than SOC max When the tractor's speed V is less than the set value and the tractor is lightly loaded, the single-motor drive mode is adopted; when the tractor's speed V is less than the set value and the tractor is medium-loaded or heavy-loaded, the dual-motor torque coupling drive mode is adopted; when the tractor's speed V is greater than the set value and the tractor is medium-loaded, the dual-motor speed coupling drive mode is adopted; when the tractor's speed V is greater than the set value and the tractor is heavily loaded, the dual-motor speed and torque coupling drive mode is adopted.

[0034] The beneficial effects of the present invention are:

[0035] The present invention is suitable for high-horsepower hybrid tractors in multiple working conditions; the drive system can selectively adopt a drive mode in which dual drive motors are coupled to the engine, ensuring that the tractor can output high horsepower in any state while allowing the engine to operate in the optimal fuel consumption area as much as possible, taking into account both power and economy; the mechanical coupling device adopts a multi-gear design to realize multiple working modes, and can switch to the corresponding working mode according to the tractor state and working condition, with high working condition matching and good energy utilization; the rear power output device is driven by an electric motor, and can achieve stepless speed change within the speed range, thereby improving the matching degree of agricultural machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic diagram of the high-horsepower hybrid tractor drive system of the present invention;

[0038] Figure 2 Schematic diagram of the structure of the mechanical coupling device of the present invention;

[0039] Figure 3 Schematic diagram of energy flow in the single-motor driving mode according to the present invention, wherein the solid arrows indicate driving in gear I and the hollow arrows indicate driving in gear II;

[0040] Figure 4 This is a schematic diagram of energy flow in the dual-motor torque coupling drive mode of the present invention;

[0041] Figure 5 This is a schematic diagram of energy flow in the dual-motor speed-coupled driving mode of the present invention;

[0042] Figure 6 Schematic diagram of energy flow in the dual-motor speed and torque coupled driving mode of the present invention;

[0043] Figure 7 This is a schematic diagram of energy flow in the dual-motor independent driving and rotary tillage modes of the present invention;

[0044] Figure 8 This is a schematic diagram of energy flow in the dual-motor coupled driving and rotary tillage modes of the present invention;

[0045] Figure 9Schematic diagram of energy flow in the parallel hybrid drive mode of the present invention, wherein solid arrows indicate driving only, and hollow arrows indicate driving and tilling;

[0046] Figure 10 Schematic diagram of energy flow in a conventional engine drive mode in the control method of the present invention, wherein solid arrows indicate driving only, and hollow arrows indicate driving and rotary tillage;

[0047] In the picture:

[0048] 1-Vehicle controller; 2-Battery pack; 3-Inverter; 4-Engine; 5-Generator; 6-Main drive motor; 7-PTO drive motor; 8-Mechanical coupling device; 9-Rear power take-off device; 10-Transmission; 11-Vehicle speed sensor; 12-Wheel; 13-Drive axle; 14-Main drive motor controller; 15-Engine controller; 16-PTO drive motor controller; 17-Generator controller; 18-First power transmission shaft; 19-Second power transmission shaft; 20- Third power transmission shaft; 21-G1 transmission gear; 22-C1 clutch; 23-G2 transmission gear; 24-planetary gear mechanism; 25-C2 clutch; 26-G3 idler gear; 27-connector T; 28-sun gear; 29-C3 clutch; 30-G4 transmission gear; 31-G5 transmission gear; 32-ring gear; 33-locker B; 34-planetary carrier; 35-G6 idler gear; 36-shift synchronizer; 37-G7 idler gear; 38-C4 clutch. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships 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, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] like Figure 1 As shown, the high-horsepower hybrid tractor drive system of the present invention includes a vehicle controller 1, an engine 4, and a mechanical coupling device 8. The vehicle controller 1 is signal-connected to an engine controller 15, a generator controller 17, a main drive motor controller 14, and a PTO drive motor controller 16 to respectively control the operation of the engine 4, the generator 5, the main drive motor 6, and the PTO drive motor 7. The vehicle controller 1 also receives a real-time state of charge signal from a battery pack 2 and a real-time speed signal from a vehicle speed sensor 11 as a basis for controlling the operation of each unit of the drive system to achieve torque distribution and mode switching.

[0053] The engine 4 is mechanically connected to the generator 5, and the output power is electrically connected to the battery pack 2, the main drive motor 6, and the PTO drive motor 7 through the inverter 3. The generator 5, the main drive motor 6, and the PTO drive motor 7 are mechanically connected to the mechanical coupling device 8. The two outputs of the mechanical coupling device 8 are mechanically connected to the transmission 10 and the rear power output device 9 respectively. The transmission 10 is mechanically connected to the drive axle 13, and the drive axle 13 is connected to the vehicle half-axle to drive the wheels 12; the engine 4 is one of the power sources of the whole vehicle, and is controlled by the engine controller 15 to work in time to drive the whole vehicle or drive the generator 5 to output electrical energy; the battery pack 2 is an energy storage component, which stores the electrical energy generated by the generator 5 and is used to provide electrical energy to the main drive motor 6 and the PTO drive motor 7; the main drive motor 6 and the PTO drive motor 7 are also the power sources of the whole machine, and the output power drives the tractor to work.

[0054] The engine 4 is connected to the generator 5, and the output power of the generator 5 is electrically connected to the battery pack 2, the main drive motor 6 and the PTO drive motor 7 through the inverter 3. The generator 5, the main drive motor 6 and the PTO drive motor 7 are respectively connected to the mechanical coupling device 8, and the two output ends of the mechanical coupling device 8 are respectively connected to the transmission 10 and the rear power output device 9; the transmission 10 is connected to the drive axle 13, and the drive axle 13 is connected to the vehicle half-axle for driving the wheels 12.

[0055] like Figure 2 , the mechanical coupling device 8 includes a first power transmission shaft 18, a second power transmission shaft 19, a third power transmission shaft 20, a planetary gear mechanism 24, a shift synchronizer 36, a connector T27, a locker B33 and a clutch assembly;

[0056] One end of the first power transmission shaft 18 is connected to the main drive motor 6, and the other end of the first power transmission shaft 18 is connected to the second power transmission shaft 19 through a gear pair consisting of a G2 transmission gear 23 and a G5 transmission gear 31; one end of the second power transmission shaft 19 is connected to the generator 5; one end of the first power transmission shaft 18 is connected to one end of the second power transmission shaft 19 through a gear pair consisting of a G1 transmission gear 21 and a G3 idler gear 26; the other end of the second power transmission shaft 19 is connected to the transmission 10; the second power transmission shaft 19 is equipped with a C2 clutch 25, a G3 idler gear 26, a connector T27, a planetary gear mechanism 24, a C3 clutch 29, a G4 transmission gear 30, and a G5 transmission gear 31, wherein the G3 idler gear 26 is meshed with the G1 transmission gear 21, and the G5 transmission gear 31 is meshed with the G2 transmission gear 23, and the connector T27 can control the engagement and disengagement of the G3 idler gear 26 and the second power transmission shaft 19. Open; one end of the third power transmission shaft 20 is connected to the PTO drive motor 7, and the other end of the third power transmission shaft 20 is connected to the rear power output device 9; the third power transmission shaft 20 is fixed with a G6 idler gear 35, a shift synchronizer 36, a G7 idler gear 37, and a C4 clutch 38, wherein the G6 idler gear 35 and the G7 idler gear 37 are connected through the shift synchronizer 36, and the G7 idler gear 37 is engaged with the G4 transmission gear 30; the planetary gear mechanism 24 includes a sun gear 28, a planet carrier 34 and a ring gear 32; the sun gear 28 is mounted on the second power transmission shaft 19, the planet carrier 34 is connected to the first power transmission shaft 18; the ring gear 32 is connected to the third power transmission shaft 20; the sun gear 28 is mechanically connected to the generator 5 through the C2 clutch 25, the planet carrier 34 is mechanically connected to the transmission 10 through the C3 clutch 29, the ring gear 32 is engaged with the G6 idler gear 35, and can be locked with the locker B33 at the same time.

[0057] The clutch assembly includes a C1 clutch 22, a C2 clutch 25, a C3 clutch 29, and a C4 clutch 38; the C1 clutch 22 is used to selectively connect the second power transmission shaft 19 to the first power transmission shaft 18; the C2 clutch 25 is used to selectively connect the generator 5 to the sun gear 28; the C3 clutch 29 is used to selectively connect the planetary carrier 34 to the transmission 10; the C4 clutch 38 is used to selectively connect the PTO drive motor 7 to the rear power output device 9;

[0058] The shift synchronizer 36 is used to selectively connect the third power transmission shaft 20 with the ring gear 32 or to connect the third power transmission shaft 20 with the second power transmission shaft 19; the locker B33 is used to connect the ring gear 32 with the fixing part; the connector T27 is used to selectively connect the first power transmission shaft 18 with the second power transmission shaft 19.

[0059] By selectively controlling the engagement of the shift synchronizer 36, the locker B33 and the clutch assembly, a transmission mode is provided between the generator 5 or the main drive motor 6 or the PTO drive motor 7 or the main drive motor 6 and the PTO drive motor 7 or the generator 5, the main drive motor 6 and the PTO drive motor 7 and the rear power output device 9 and / or the transmission 10: pure electric drive mode, hybrid drive mode and engine drive mode.

[0060] When the SOC value of battery pack 2 is greater than SOC max In this embodiment, SOC max The maximum power output is 65%, but not limited to 65%. In pure electric drive mode, the engine 4 does not work, and the battery pack 2 provides power to the main drive motor 6 and the PTO drive motor 7. In this mode, the mechanical coupling device 8 can realize single-motor driving, dual-motor torque coupling driving, dual-motor speed coupling driving, dual-motor speed and torque coupling driving, dual-motor independent driving driving, dual-motor coupled driving, and other working modes, and is switched according to the actual load and speed of the tractor. In this embodiment, the preset speed value of the tractor during normal driving is 20km / h, but not limited to 20km / h. The field rotary tillage operation is the external work of the rear power output device 9. The details are as follows:

[0061] like Figure 3 As shown, single-motor driving mode: only the main drive motor 6 works, 1) first gear drive: only the connector T27, C3 clutch 29 and lock B33 are engaged, the output power of the main drive motor 6 is transmitted to the sun gear 28 through the first power transmission shaft 18, and then transmitted to the transmission 10 through the planetary carrier 34, and further transmitted to the drive axle 13 to drive the wheels 12 for driving; 2) second gear drive: only the C1 clutch 22 is engaged, the output power of the main drive motor 6 is transmitted to the second power transmission shaft 19 through the first power transmission shaft 18, and then transmitted to the transmission 10, and further transmitted to the drive axle 13 to drive the wheels 12 for driving; two-gear switching is achieved in this mode, which is used when the tractor is lightly loaded and the vehicle speed is less than a preset value.

[0062] Single-motor drive mode: Only the PTO drive motor 7 is operating, and only the C4 clutch 38 is engaged. The output power of the PTO drive motor 7 is transmitted to the rear power take-off device 9, which directly performs external work. This mode is generally used when the vehicle is stopped, that is, when the vehicle speed is 0.

[0063] like Figure 4As shown, the dual-motor torque coupling drive driving mode: the main drive motor 6 and the PTO drive motor 7 work at the same time, only the C1 clutch 22 is engaged, and the shift synchronizer 36 is selectively controlled to connect the third power transmission shaft 20 with the second power transmission shaft 19 (that is, the shift synchronizer 36 is engaged to the right), and the output power of the main drive motor is transmitted to the second power transmission shaft through the first power transmission shaft, and the output power of the PTO drive motor is transmitted to the second power transmission shaft through the third power transmission shaft. The output power of the main drive motor and the output power of the PTO drive motor are torque-coupled in the second power transmission shaft, and then output to the transmission drive axle to drive the wheels for driving; this working mode is used in tractors, when traveling with heavy loads and the vehicle speed is less than a preset value.

[0064] like Figure 5 As shown, the dual-motor speed coupling drive mode: the main drive motor 6 and the PTO drive motor 7 work simultaneously, only the connector T27 and the C3 clutch 29 are engaged, and the shift synchronizer 36 is selectively controlled to connect the third power transmission shaft 20 with the ring gear 32 (that is, the shift synchronizer 36 is engaged to the left), and the output power of the main drive motor 6 is transmitted to the second power transmission shaft through the first power transmission shaft, and is transmitted to the sun gear 28 of the planetary gear mechanism 24 and output from the planetary carrier 34; the output power of the PTO drive motor 7 is transmitted to the ring gear 32 of the planetary gear mechanism 24 through the third power transmission shaft 20 and output from the planetary carrier 34. The two types of power are output to the transmission 10 after speed coupling at the planetary carrier 34, and then transmitted to the drive axle 13 to drive the wheels 12 for driving; this working mode is used when the tractor is light or medium loaded and the vehicle speed is greater than the preset value.

[0065] like Figure 6 As shown, the dual-motor speed and torque coupling drive mode: the main drive motor 6 and the PTO drive motor 7 work simultaneously, only the connector T27, the C3 clutch 29, and the C1 clutch 22 are engaged, and the shift synchronizer 36 is engaged to the left. The output power of the main drive motor 6 is transmitted to the sun gear 28 and the second power transmission shaft 19 of the planetary gear mechanism 24 via the first power transmission shaft 18, and the output power of the PTO drive motor 7 is transmitted to the ring gear 32 of the planetary gear mechanism 24 via the third power transmission shaft 20. The speeds of the sun gear 28 and the ring gear 32 are coupled to the planet carrier 34 and then output to the second power transmission shaft 19, and coupled with the output power torque of the main drive motor 6 to the transmission 10, and then transmitted to the drive axle 13 to drive the wheels 12 for driving. This working mode is used when the tractor is heavily loaded and the vehicle speed is greater than a preset value.

[0066] In any of the dual-motor torque coupling drive mode, the dual-motor speed coupling drive mode, and the dual-motor speed and torque coupling drive mode, the C4 clutch 38 is selectively controlled to engage, providing a transmission mode between the main drive motor 6 and the PTO drive motor 7 and the rear power take-off device 9 and the transmission 10. The following examples are given:

[0067] like Figure 7 As shown, the dual-motor independent driving rotary tillage mode: the vehicle controller 1 controls the C1 clutch 22 and the C4 clutch 38 to engage, the main drive motor 6 outputs power through the first power transmission shaft 18 to the second power transmission shaft 19 and then inputs it into the transmission 10 and the drive axle 13 to drive the wheels 12, and the PTO drive motor 7 outputs power through the third power transmission shaft 20 to directly drive the rear power output device 9 to work; this working mode is used when the tractor is lightly loaded and rotary tilling.

[0068] like Figure 8 As shown, the dual-motor coupling drive driving rotary tillage mode: the vehicle controller 1 controls the C1 clutch 22 and the C4 clutch 38 to engage, the shift synchronizer 36 is engaged to the right, the main drive motor 6 outputs power through the first power transmission shaft 18 to the second power transmission shaft 19, the power input transmission 10 is transmitted to the drive axle 13 to drive the wheels 12, and the second power transmission shaft 19 is transmitted to the third power transmission shaft 20, and the power output of the PTO drive motor 7 is coupled on the third power transmission shaft 20 to drive the rear power output device 9 to work; this working mode is used when the tractor is heavily loaded and rotary tillage.

[0069] When the SOC value of battery pack 2 is SOC min and SOC max If the tractor is lightly loaded, the pure electric drive mode is still used, and the specific method is the same as above; if the tractor is medium or heavy loaded, the hybrid drive mode is used. min 25%, but not limited to 25%; the hybrid drive mode includes a series charging mode at medium load and a series hybrid mode and a parallel hybrid mode at heavy load, in which the engine 4, the main drive motor 6 and the PTO drive motor 7 are all working and the engine 4 only works in the optimal fuel consumption area, and the remaining power is compensated by the dual drive motors;

[0070] Series hybrid mode: In any of the dual-motor torque coupling drive mode, the dual-motor speed coupling drive mode, and the dual-motor speed and torque coupling drive mode, the engine 4 drives the generator 5 to generate electrical energy, and the generated electrical energy is input into the main drive motor 6 and the PTO drive motor 7 to form a series hybrid mode;

[0071] Series charging mode: In any of the dual-motor torque coupling drive mode, the dual-motor speed coupling drive mode, and the dual-motor speed and torque coupling drive mode, the engine 4 drives the generator 5 to generate electricity, part of which is input to the main drive motor 6 and the PTO drive motor 7, and the other part of the generated electricity is input to the battery pack 2, so as to form a series charging mode;

[0072] like Figure 9As shown, in parallel hybrid mode: the generator 5, the main drive motor 6 and the PTO drive motor 7 work simultaneously, only the C2 clutch 25, the C3 clutch 29, the C1 clutch 22 and the lock B33 are engaged, the shift synchronizer 36 is engaged to the right, the engine 4 works in the optimal fuel consumption area, the output power is directly transmitted to the sun gear 28 via the generator 5, and then drives the planetary carrier 34 to output to the second power transmission shaft 19, while the battery pack 2 supplies power to the main drive motor 6 and the PTO drive motor 7, the main drive motor 6 outputs power via the first power transmission shaft 18 to the second power transmission shaft 19, the PTO drive motor 7 outputs power via the third power transmission shaft 20 to the second power transmission shaft 19, the engine 4 is coupled with the output power torque of the main drive motor 6 and the PTO drive motor 7, and the coaxial output is transmitted to the transmission 10, and then transmitted to the drive axle 13 to drive the wheels 12 for driving;

[0073] Parallel hybrid heavy-load rotary tillage: only the C2 clutch 25, C3 clutch 29, C1 clutch 22, C4 clutch 38 and lock B33 are engaged, the shift synchronizer 36 is engaged to the right, the engine 4 operates in the optimal fuel consumption area, and the output power is directly transmitted to the sun gear 28 through the generator 5, and then drives the planetary carrier 34 to output to the second power transmission shaft 19. At the same time, the battery pack 2 supplies power to the main drive motor 6 and the PTO drive motor 7. The output power of the main drive motor 6 is transmitted to the second power transmission shaft 19 through the first power transmission shaft 18, and is coupled with the output power torque of the engine 4 to be transmitted to the transmission 10 and then input into the drive axle 13 to drive the wheels 12 to move. At the same time, it is transmitted to the third power transmission shaft 20, and coupled with the output power torque of the PTO drive motor 7 to drive the rear power output device 9 to work.

[0074] When the SOC value of battery pack 2 is less than SOC min In this mode, the traditional engine drive mode is adopted, including the engine direct drive mode and the engine driven driving rotary tillage mode. In this mode, the battery pack 2 does not discharge, the main drive motor 6 and the PTO drive motor 7 do not work, the engine 4 provides the power of the whole machine, and drives the generator 5 to charge the battery pack 2 at the same time. When the SOC value of the battery pack 2 is greater than the SOC min When the engine is in the hybrid mode, the engine 4 is switched to the hybrid mode, wherein the engine 4 operates in the optimal fuel consumption area first. If the power required by the whole machine is large, the engine 4 can operate outside the optimal fuel consumption area to ensure that the power demand of the whole machine is met.

[0075] like Figure 10 As shown, in the engine direct drive mode: only the C2 clutch 25, the C3 clutch 29 and the lock B33 are engaged, and the output power of the engine 4 is directly transmitted to the sun gear 28 via the generator, and then drives the planetary carrier 34 to output to the transmission 10, and then input to the drive axle 13 to drive the wheels 12;

[0076] Engine driven rotary tillage mode: only C2 clutch 25, C3 clutch 29, C4 clutch 38 and lock B33 are engaged, the shift synchronizer 36 is engaged to the right, and the power output of the engine 4 is directly transmitted to the sun gear 28 through the generator 5 to drive the planetary carrier 34 to output to the transmission 10 and then input into the drive axle 13 to drive the wheels 12 to drive, while also being transmitted to the third power transmission shaft 20 to drive the rear power output device 9 to work.

[0077] The various working modes are specifically shown in Table 1 below, where the symbol "Y" indicates that the engine or motor is in working state, "N" indicates that the engine or motor is in non-working state, "D" indicates that the clutch or connector is in disconnected state, "C" indicates that the clutch or connector is in engaged state, "1" indicates that the lock is in locked state, "0" indicates that the lock is in unlocked state, "S" indicates that the shift synchronizer is in neutral state, "R" indicates that the shift synchronizer is in right engaged state, and "L" indicates that the shift synchronizer is in left engaged state.

[0078] Table 1

[0079]

[0080] A control method for a high-horsepower hybrid tractor drive system includes the following steps:

[0081] Obtain the load size through the sensor to determine whether the current load is light, medium or heavy; obtain the SOC value of the battery pack 2; obtain the tractor's speed V through the sensor;

[0082] When the SOC value of battery pack 2 is greater than SOC max When the SOC value of battery pack 2 is SOC min and SOC max When the SOC value of the battery pack (2) is greater than SOC max When the tractor's speed V is less than the set value and the tractor is lightly loaded, the single-motor drive mode is adopted; when the tractor's speed V is less than the set value and the tractor is medium-loaded or heavy-loaded, the dual-motor torque coupling drive mode is adopted; when the tractor's speed V is greater than the set value and the tractor is medium-loaded, the dual-motor speed coupling drive mode is adopted; when the tractor's speed V is greater than the set value and the tractor is heavily loaded, the dual-motor speed and torque coupling drive mode is adopted.

[0083] When the SOC value of battery pack 2 is SOC min and SOC max When the tractor is working with medium or heavy load, the hybrid drive mode is used;

[0084] When the SOC value of battery pack 2 is less than SOC min When the engine is driven, the vehicle works in engine driving mode.

[0085] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0086] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-horsepower hybrid tractor drive system, characterized in that: It includes an engine (4), a generator (5), a battery pack (2), a main drive motor (6), a PTO drive motor (7) and a mechanical coupling device (8); The engine (4) is connected to a generator (5), and the power output of the generator (5) is electrically connected to a battery pack (2), a main drive motor (6), and a PTO drive motor (7) through an inverter (3). The generator (5), the main drive motor (6), and the PTO drive motor (7) are respectively connected to a mechanical coupling device (8), and two output ends of the mechanical coupling device (8) are respectively connected to a transmission (10) and a rear power output device (9); the transmission (10) is connected to a drive axle (13), and the drive axle (13) is connected to a half-axle of the vehicle for driving wheels (12); The mechanical coupling device (8) includes a first power transmission shaft (18), a second power transmission shaft (19), a third power transmission shaft (20), a planetary gear mechanism (24), a shift synchronizer (36), a connector T (27), a locker B (33) and a clutch assembly; One end of the first power transmission shaft (18) is connected to the main drive motor (6), and the other end of the first power transmission shaft (18) is connected to the second power transmission shaft (19); one end of the second power transmission shaft (19) is connected to the generator (5); the other end of the second power transmission shaft (19) is connected to the transmission (10); one end of the third power transmission shaft (20) is connected to the PTO drive motor (7), and the other end of the third power transmission shaft (20) is connected to the rear power output device (9); the planetary gear mechanism (24) includes a sun gear (28), a planet carrier (34) and a ring gear (32); the sun gear (28) is mounted on the second power transmission shaft (19); The clutch assembly includes a C1 clutch (22), a C2 clutch (25), a C3 clutch (29) and a C4 clutch (38); the C1 clutch (22) is used to selectively connect the second power transmission shaft (19) to the first power transmission shaft (18); the C2 clutch (25) is used to selectively connect the generator (5) to the sun gear (28); the C3 clutch (29) is used to selectively connect the planetary carrier (34) to the transmission (10); the C4 clutch (38) is used to selectively connect the PTO drive motor (7) to the rear power output device (9); The shift synchronizer (36) is used to selectively connect the third power transmission shaft (20) to the ring gear (32) or to connect the third power transmission shaft (20) to the second power transmission shaft (19); the locker B (33) is used to connect the ring gear (32) to the fixing member; the connector T (27) is used to selectively connect the first power transmission shaft (18) to the second power transmission shaft (19); By selectively controlling the engagement of the shift synchronizer (36), the locker B (33) and the clutch assembly, a transmission mode is provided between the generator (5) and the rear power output device (9) and / or the transmission (10), between the main drive motor (6) and the rear power output device (9) and / or the transmission (10), between the PTO drive motor (7) and the rear power output device (9) and / or the transmission (10), between the main drive motor (6) and the PTO drive motor (7) and the rear power output device (9) and / or the transmission (10), and between the generator (5), the main drive motor (6) and the PTO drive motor (7) and the rear power output device (9) and / or the transmission (10): a pure electric drive mode, a hybrid drive mode and an engine drive mode.

2. The high-horsepower hybrid tractor drive system according to claim 1, characterized in that: The pure electric driving mode includes a single motor driving mode, a dual motor torque coupling driving mode, a dual motor speed coupling driving mode and a dual motor speed and torque coupling driving mode. Selectively controlling the engagement of the connector T (27), the C3 clutch (29) and the lock B (33) to provide a single motor drive mode between the main drive motor (6) and the transmission (10); Selectively controlling the C1 clutch (22) to engage, providing another single-motor driving mode between the main drive motor (6) and the transmission (10); selectively controlling the engagement of the C4 clutch (38) to provide a single motor drive mode between the PTO drive motor (7) and the rear power take-off device (9); selectively controlling the C1 clutch (22) to engage, and selectively controlling the shift synchronizer (36) to connect the third power transmission shaft (20) to the second power transmission shaft (19), providing a dual-motor torque coupling drive mode between the main drive motor (6) and the PTO drive motor (7) and the transmission (10); Selectively controlling the connector T (27) and the C3 clutch (29) to engage, and selectively controlling the shift synchronizer (36) to connect the third power transmission shaft (20) to the ring gear (32), providing a dual-motor speed coupling drive mode between the main drive motor (6) and the PTO drive motor (7) and the transmission (10); Selectively controlling the connector T (27), the C3 clutch (29), and the C1 clutch (22) to engage, and selectively controlling the shift synchronizer (36) to connect the third power transmission shaft (20) to the ring gear (32), providing a dual-motor speed and torque coupling drive mode between the main drive motor (6) and the PTO drive motor (7) and the transmission (10); In any of the dual motor torque coupling drive mode, the dual motor speed coupling drive mode and the dual motor speed and torque coupling drive mode, the C4 clutch (38) is selectively controlled to engage, providing a transmission mode between the main drive motor (6) and the PTO drive motor (7) and the rear power output device (9) and the transmission (10).

3. The high-horsepower hybrid tractor drive system according to claim 2, characterized in that: The hybrid driving modes include series charging mode, series hybrid mode and parallel hybrid mode; In any one of the dual-motor torque coupling drive mode, the dual-motor speed coupling drive mode, and the dual-motor speed and torque coupling drive mode, the engine (4) drives the generator (5) to generate electric energy, and the generated electric energy is input into the main drive motor (6) and the PTO drive motor (7) to form a series hybrid mode; In any one of the dual-motor torque coupling drive mode, the dual-motor speed coupling drive mode, and the dual-motor speed and torque coupling drive mode, the engine (4) drives the generator (5) to generate electric energy, a portion of the generated electric energy is input to the main drive motor (6) and the PTO drive motor (7), and another portion of the generated electric energy is input to the battery pack (2) to form a series charging mode; selectively controlling the C2 clutch (25), the C3 clutch (29), the C1 clutch (22) and the lock B (33) to engage, and selectively controlling the shift synchronizer (36) to connect the third power transmission shaft (20) with the second power transmission shaft (19), providing a parallel hybrid mode between the generator (5), the main drive motor (6) and the PTO drive motor (7) and the transmission (10); The C2 clutch (25), the C3 clutch (29), the C1 clutch (22), the C4 clutch (38) and the lock B (33) are selectively controlled to engage, and the shift synchronizer (36) is selectively controlled to connect the third power transmission shaft (20) with the second power transmission shaft (19), providing a parallel hybrid mode between the generator (5), the main drive motor (6) and the PTO drive motor (7) and the transmission (10) and the rear power output device (9).

4. The high-horsepower hybrid tractor drive system according to claim 2, characterized in that: selectively controlling the engagement of the C2 clutch (25), the C3 clutch (29) and the lock B (33) to provide an engine drive mode between the generator (5) and the transmission (10); The C2 clutch (25), the C3 clutch (29), the C4 clutch (38) and the lock B (33) are selectively controlled to engage, and the shift synchronizer (36) is selectively controlled to connect the third power transmission shaft (20) with the second power transmission shaft (19), providing an engine drive mode between the generator (5) and the transmission (10) and the rear power output device (9).

5. A control method for a high-horsepower hybrid tractor drive system according to any one of claims 1-2, characterized in that: The steps include: Obtain the load size through the sensor and judge whether the current load is light load, medium load or heavy load; obtain the battery pack (2) value; When the battery pack (2) Value greater than When, or when the battery pack (2) Value and When the tractor is lightly loaded, it operates in pure electric drive mode; When the battery pack (2) Value and When the tractor is working with medium or heavy load, the hybrid drive mode is used; When the battery pack (2) Value less than When the engine is driven, the vehicle works in engine driving mode.

6. The control method of a high-horsepower hybrid tractor driving system according to claim 5, characterized in that: The following steps are also included: The tractor's speed V is obtained through the sensor; When the battery pack (2) Value greater than When the tractor's speed V is less than the set value and the tractor is lightly loaded, the single-motor drive mode is adopted; when the tractor's speed V is less than the set value and the tractor is medium-loaded or heavy-loaded, the dual-motor torque coupling drive mode is adopted; when the tractor's speed V is greater than the set value and the tractor is medium-loaded, the dual-motor speed coupling drive mode is adopted; when the tractor's speed V is greater than the set value and the tractor is heavily loaded, the dual-motor speed and torque coupling drive mode is adopted.

Images