EMCVT hybrid power transmission system and control method

Abstract

The invention relates to the technical field of agricultural machinery, in particular to an EMCVT hybrid power transmission system and a control method.The structure of the EMCVT hybrid power transmission system comprises an engine connected with the first end of a first main shaft; the first motor is in transmission connection with the first main shaft; the planet row is in transmission connection with the first main shaft; the second motor is in transmission connection with the planet row; the power gear shifting part is in transmission connection with the planet row; the central transmission part is in transmission connection with the power gear shifting part; and the walking part is in transmission connection with the central transmission part. By means of the EMCVT hybrid power transmission system and the control method, the problems that an existing hydraulic mechanical continuously variable transmission technology is high in overall system complexity, and a tractor is difficult to apply can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural machinery, and in particular to an EMCVT hybrid power transmission system and a control method. Background Art

[0002] The technical route of the existing continuously variable transmission (CVT) for high-horsepower tractors is mainly the hydraulic mechanical continuously variable transmission (HM-CVT), which has large transmission power, wide speed ratio range and continuous adjustment. The hydraulic mechanical continuously variable transmission takes into account the high efficiency of mechanical transmission and the stability and low impact of hydrostatic transmission, and uses mechanical speed change mechanism and hydraulic components to achieve high-efficiency and high-power continuously variable transmission. The hydraulic mechanical continuously variable transmission is usually composed of a mechanical speed change mechanism, a pump-motor hydraulic continuously variable transmission system, a power split and convergence planetary gear mechanism, an electronic control device and a drive system. The power output from the engine is divided into mechanical and hydraulic dual-path transmission to the drive axle. The mechanical transmission is usually transmitted by a planetary gear and a multi-stage gear, or composed of a multi-stage planetary gear, while the hydraulic transmission uses a variable pump and a variable motor for speed regulation. At the output end of the hydraulic transmission, the hydraulic energy and mechanical energy are re-collected and input into the drive axle.

[0003] However, at present, the hydraulic mechanical continuously variable transmission technology is still in the stage of theoretical analysis and experimental research in China. The design and control of its high-pressure, high-efficiency pump motor and planetary mechanism coupling are difficult. At present, only prototypes are produced in China, and there is no mature application. Especially for high-horsepower tractors, the hydraulic mechanical continuously variable transmission lacks supporting resources. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide an EMCVT hybrid power transmission system and control method to solve the problem that the existing hydraulic mechanical continuously variable transmission technology has high overall system complexity and is difficult to apply to tractors.

[0005] According to a first aspect of the present invention, an EMCVT hybrid powertrain system is provided, wherein the EMCVT hybrid powertrain system comprises: an engine connected to a first end of a first main shaft; a first motor drivingly connected to the first main shaft; a planetary gearbox drivingly connected to the first main shaft; a second motor drivingly connected to the planetary gearbox; a power shift unit drivingly connected to the planetary gearbox; a central transmission unit drivingly connected to the power shift unit; and a traveling unit drivingly connected to the central transmission unit.

[0006] Preferably, the planetary gear comprises: a sun gear drivingly connected to the second motor; a planetary carrier drivingly connected to the power shifting portion; and an outer ring gear drivingly connected to the first main shaft.

[0007] Preferably, the EMCVT hybrid powertrain system further includes: a second main shaft arranged in parallel with the first main shaft, the second main shaft being connected to the planet carrier; and a third main shaft arranged in parallel with the first main shaft, the third main shaft being connected to the central transmission part.

[0008] Preferably, the power shifting portion includes: a first driving gear, which is arranged on the second main shaft; a first driven gear, which is installed on the third main shaft through a bearing, and the first driven gear is connected to the first driving gear in a transmission manner; a second driving gear, which is arranged on the second main shaft; a second driven gear, which is installed on the third main shaft through a bearing, and the second driven gear is connected to the second driving gear in a transmission manner; a third driving gear, which is arranged on the second main shaft; a third driven gear, which is installed on the third main shaft through a bearing; an intermediate gear, which is arranged between the third driven gear and the third driving gear, and the third driven gear is connected to the third driving gear in a transmission manner through the intermediate gear; a first clutch assembly, which is arranged on the third main shaft, the first clutch assembly is located between the first driven gear and the second driven gear, and the first clutch assembly can be selectively combined with the first driven gear or the second driven gear; and a second clutch assembly, which is arranged on the third main shaft, and the second clutch assembly can be combined with the third driven gear.

[0009] Preferably, the EMCVT hybrid transmission system also includes: a drive shaft, which is arranged perpendicular to the first main shaft, the central transmission part is arranged in the middle of the drive shaft, and the traveling part is arranged at both ends of the drive shaft; an end braking component, which is arranged on the drive shaft, and the end braking component is located between the central transmission part and the traveling part; a terminal reduction component, which is arranged on the drive shaft, and the terminal reduction component is located between the terminal braking component and the traveling part; a PTO assembly, which is transmission-connected to the second end of the first main shaft; a front drive component, which is arranged on the third main shaft, and the front drive component is located between the power shift part and the central transmission part; and a torsional vibration damper, which is arranged on the first main shaft, and the torsional vibration damper is located on the side of the engine.

[0010] According to a second aspect of the present invention, a control method for an EMCVT hybrid powertrain system is provided, wherein the control method for the EMCVT hybrid powertrain system is implemented using the EMCVT hybrid powertrain system as described above, and the control method for the EMCVT hybrid powertrain system includes: operating one or more of the first motor, the second motor, and the engine, and combining one of the first clutch assembly or the second clutch assembly, thereby realizing multiple operating modes.

[0011] Preferably, the multiple working modes include a pure electric drive mode. In the pure electric drive mode, the first motor and the second motor work as drive motors. The power of the first motor is transmitted to the first main shaft and then to the outer ring gear of the planetary gear row. The power of the second motor is transmitted to the sun gear of the planetary gear row. The power at the planetary gear row is transmitted to the second main shaft through the planetary carrier. The first clutch assembly or the second clutch assembly of the power shifting part is combined to transmit the power on the second main shaft to the third main shaft, and then transmit the power to the drive shaft through the central transmission part, thereby driving the walking part.

[0012] Preferably, the multiple working modes include a series drive mode, in which the first motor works as a generator and the second motor works as a drive motor, the power of the engine is transmitted to the first motor through the first main shaft, the first motor converts the power into electricity and transmits it to the second motor, the power of the second motor is transmitted to the sun gear of the planetary gear, the power at the planetary gear is transmitted to the second main shaft through the planetary carrier, the first clutch assembly or the second clutch assembly of the power shifting part is combined, so that the power on the second main shaft is transmitted to the third main shaft, and then the power is transmitted to the drive shaft through the central transmission part, thereby driving the walking part.

[0013] Preferably, the multiple working modes include a parallel drive mode, in which the first motor works as a generator and the second motor works as a drive motor, a part of the power of the engine is transmitted to the first motor through the first main shaft, and another part of the power of the engine is transmitted to the outer ring gear of the planetary gear row through the first main shaft, the first motor converts the power into electricity and transmits it to the second motor, the power of the second motor is transmitted to the sun gear of the planetary gear row, and the power at the planetary gear row is transmitted to the second main shaft through the planetary carrier, the first clutch assembly or the second clutch assembly of the power shifting part is combined to transmit the power on the second main shaft to the third main shaft, and then the power is transmitted to the drive shaft through the central transmission part, thereby driving the walking part.

[0014] Preferably, the multiple working modes include an energy recovery mode. In the energy recovery mode, the engine is idling, the second motor works as a generator, the power of the walking part is transmitted to the central transmission part through the drive shaft, and then transmitted to the third main shaft, the first clutch assembly or the second clutch assembly of the power shift part is engaged, so that the power on the third main shaft is transmitted to the second main shaft, and then transmitted to the second motor through the planetary gear, and the second motor converts the power into electricity and stores it in the battery.

[0015] The EMCVT hybrid power transmission system and control method of the embodiment of the present invention uses dual motors to replace the static hydraulic unit to achieve power splitting and energy transfer of the engine, ensure higher transmission efficiency, reduce costs and system complexity, and improve the overall reliability of the system. This can effectively solve the problem that the existing hydraulic mechanical continuously variable transmission technology has high overall system complexity and is difficult to apply to tractors.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of an EMCVT hybrid powertrain system according to the present invention.

[0019] Figure 2 It is a transmission schematic diagram of the pure electric drive mode of the EMCVT hybrid power transmission system according to the present invention.

[0020] Figure 3 3 is a transmission schematic diagram of a series drive mode of an EMCVT hybrid powertrain system according to the present invention.

[0021] Figure 4 3 is a transmission schematic diagram of the parallel drive mode of the EMCVT hybrid powertrain system according to the present invention.

[0022] Figure 5 Schematic diagram of the transmission of the energy recovery mode of the EMCVT hybrid powertrain according to the present invention.

[0023] Figure numerals: 1-engine; 2-torsion vibration damper; 3-second motor; 4-planetary gear; 41-sun gear; 42-planet carrier; 43-outer ring gear; 5-first motor; 6-power shift unit; 61-first driving gear; 62-second driving gear; 63-third driving gear; 64-first driven gear; 65-second driven gear; 66-third driven gear; 67-intermediate gear; 601-first clutch assembly; 602-second clutch assembly; 7-front drive component; 8-central transmission unit; 9-terminal braking component; 10-terminal speed reduction component; 11-traveling unit; 12-PTO assembly; 13-battery; 100-first main shaft; 200-second main shaft; 300-third main shaft; 400-drive shaft. DETAILED DESCRIPTION

[0024] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0025] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0026] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0027] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0028] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0029] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0030] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0031] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0032] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0033] like Figure 1As shown, according to the first aspect of the present invention, an EMCVT hybrid transmission system is provided, and the EMCVT (electric transmission and mechanical transmission coupled continuously variable transmission) hybrid transmission system includes an engine 1, a first motor 5, a planetary gear 4, a second motor 3, a power shift unit 6, a central transmission unit 8 and a running unit 11.

[0034] In the following description, reference will be made to Figure 1 The specific structures of the above components of the EMCVT hybrid powertrain system and the connection relationships of the above components are described in detail.

[0035] like Figure 1 As shown, in the embodiment, the engine 1 can be connected to the first end of the first main shaft 100 (which can be Figure 1 The first motor 5 can be connected to the middle part of the first main shaft 100. The first main shaft 100 can be connected to the planetary gear 4. The second motor 3 can also be connected to the planetary gear 4. The planetary gear 4 can be connected to the power shifting part 6. The power shifting part 6 can be connected to the central transmission part 8. The central transmission part 8 can be connected to the walking part 11 to drive the walking part 11 to move.

[0036] Preferably, Figure 1 As shown, in the embodiment, the first main shaft 100 can be arranged along the length direction of the tractor. The first motor 5 can be connected to the middle of the first main shaft 100 through a shaft gear transmission to achieve power transmission. The first main shaft 100 can be inserted into the second motor 3 (or the first main shaft 100 can be arranged on the side of the second motor 3), and the first main shaft 100 and the second motor 3 are not directly connected.

[0037] Preferably, Figure 1 As shown, in the embodiment, the planetary gear 4 may include a sun gear 41, a planet carrier 42 and an outer gear ring 43. Among them, the sun gear 41 may be connected to the second motor 3 through a shaft gear transmission, so that the second motor 3 can transmit power to the sun gear 41. The outer gear ring 43 may be connected to the first main shaft 100 through a shaft gear transmission, so that the first motor 5 and the engine 1 can transmit power to the sun gear 41. The planet carrier 42 may be connected to the power shift unit 6 through a transmission, so that the power of the engine 1, the first motor 5 and the second motor 3 can be transmitted to the power shift unit 6, so that the operator can select a suitable transmission ratio. Thereafter, the power is transmitted to the central transmission unit 8 to drive the walking unit 11 to move.

[0038] Further, preferably, Figure 1As shown, in an embodiment, the EMCVT hybrid powertrain system may include a second main shaft 200 and a third main shaft 300. Among them, the second main shaft 200 may be arranged in parallel with the first main shaft 100. The end of the second main shaft 200 may be rigidly connected to the planetary carrier 42 (may be a key connection), so that the power on the planetary row 4 can be transmitted to the second main shaft 200. The third main shaft 300 may also be arranged in parallel with the first main shaft 100. The power shift unit 6 may be installed on the second main shaft 200 and the third main shaft 300, so that power can be transmitted between the second main shaft 200 and the third main shaft 300. The end of the third main shaft 300 may be transmission-connected to the central transmission unit 8 through a bevel gear.

[0039] More preferably, the power shifting unit 6 may include multiple gears. Figure 1 As shown, in an embodiment, the power shifting part 6 may include three gears. The power shifting part 6 may include a first driving gear 61, a first driven gear 64, a second driving gear 62, a second driven gear 65, a third driving gear 63, a third driven gear 66, an intermediate gear 67, a first clutch assembly 601 and a second clutch assembly 602. Among them, the first driving gear 61 may be key-connected with the second main shaft 200. The first driven gear 64 may be mounted on the third main shaft 300 through a bearing. The first driven gear 64 may be aligned with the first driving gear 61, and the two may mesh with each other to achieve a transmission connection. Similarly, the second driving gear 62 may be key-connected with the second main shaft 200. The second driven gear 65 may be mounted on the third main shaft 300 through a bearing. The second driven gear 65 may be aligned with the second driving gear 62, and the two may mesh with each other to achieve a transmission connection. The third driving gear 63 may be key-connected with the second main shaft 200. The third driven gear 66 may be mounted on the third main shaft 300 through a bearing. The third driven gear 66 may be aligned with the third driving gear 63 , and an intermediate gear 67 may be provided therebetween. The third driven gear 66 is transmission-connected to the third driving gear 63 via the intermediate gear 67 to achieve reverse gear.

[0040] Preferably, Figure 1As shown, in the embodiment, the first clutch assembly 601 and the second clutch assembly 602 can be installed on the third main shaft 300. Specifically, the first clutch assembly 601 can be arranged between the first driven gear 64 and the second driven gear 65, so that the first clutch assembly 601 can be selectively combined with the first driven gear 64 or the second driven gear 65, so that the first driven gear 64 or the second driven gear 65 can be connected to the third main shaft 300. The second clutch assembly 602 can be combined with the third driven gear 66, so that the third driven gear 66 can be connected to the third main shaft 300. During use, the operator can select a suitable transmission ratio by combining the first clutch assembly 601 or the second clutch assembly 602. The operator can adjust the speed of the engine 1 according to the power demand, keep the engine 1 at the best economic speed, so as to improve the economy, and realize stepless speed change while increasing the vehicle speed. However, it is not limited thereto. The power shifting portion 6 is provided with three gears only as a preferred case in the embodiment. In actual use, the power shifting portion 6 may also be provided with more or fewer gears.

[0041] In addition, preferably, Figure 1 As shown, in an embodiment, the EMCVT hybrid powertrain system may further include a drive shaft 400, a terminal brake component 9, a terminal reduction component 10, a PTO assembly 12, a front drive component 7, and a torsional vibration damper 2. The drive shaft 400 may be arranged perpendicular to the first main shaft 100 (i.e., arranged along the vehicle width direction). The central transmission part 8 may be arranged in the middle of the drive shaft 400, and the walking part 11 may be arranged at both ends of the drive shaft 400. A differential with a wet clutch differential lock is arranged in the central transmission part 8 to achieve power change. The walking part 11 may be a wheel, and the walking part 11 is connected to the drive shaft 400 in transmission to drive the tractor. The terminal brake component 9 is installed on the drive shaft 400, and the terminal brake component 9 may be arranged between the central transmission part 8 and the walking part 11. The terminal brake component 9 may include a brake disc, which realizes driving brake and parking brake through the friction of the brake disc. The terminal reduction component 10 can also be arranged on the driving shaft 400, and the terminal reduction component 10 can be located between the terminal braking component 9 and the walking part 11. The terminal reduction component 10 is used to further reduce speed and increase torque, and the terminal reduction component 10 can be a planetary gear system.

[0042] In an embodiment, the PTO assembly 12 can be connected to the second end of the first main shaft 100 (which can be Figure 1The first main shaft 100 is connected to the right end of the first main shaft 100 by transmission connection, so that the power on the first main shaft 100 can be transmitted to the PTO assembly 12. A clutch can also be provided between the PTO assembly 12 and the second end of the first main shaft 100, so that the PTO assembly 12 can be selectively connected to the first main shaft 100. The front drive component 7 can be provided on the third main shaft 300. The front drive component 7 can be provided between the power shifting part 6 and the central transmission part 8. The front drive component 7 can control the engagement and disengagement through a wet clutch, and transmit power to the front axle of the vehicle to achieve the engagement and disengagement of the four-wheel drive. The torsional vibration damper 2 can be provided on the side of the engine 1, and the torsional vibration damper 2 is installed on the first main shaft 100 for vibration reduction.

[0043] In addition, if Figures 2 to 4 As shown, according to the second aspect of the present invention, a control method of an EMCVT hybrid powertrain system is provided, and the control method of the EMCVT hybrid powertrain system is implemented by the EMCVT hybrid powertrain system as described above. The control method of the EMCVT hybrid powertrain system comprises: operating one or more of the first motor 5, the second motor 3, and the engine 1, and engaging one of the first clutch assembly 601 or the second clutch assembly 602, so as to realize multiple working modes.

[0044] Specifically, Figure 2 As shown, in an embodiment, the multiple working modes may include a pure electric drive mode. When the tractor has sufficient power, the operator can enter the pure electric drive mode by pressing the pure electric drive mode button. In the pure electric drive mode, the first motor 5 and the second motor 3 can work as drive motors. The battery 13 of the tractor (only shown in part of the figure) supplies energy to the first motor 5 and the second motor 3. After the power of the first motor 5 is transmitted to the first main shaft 100, it is transmitted to the outer gear ring 43 of the planetary gear 4 through the shaft teeth. The power of the second motor 3 is transmitted to the sun gear 41 of the planetary gear 4. After the power of the first motor 5 and the power of the second motor 3 merge at the planetary gear 4, they are transmitted to the second main shaft 200 through the planet carrier 42. The first clutch assembly 601 or the second clutch assembly 602 in the power shifting part 6 is combined to transmit the power on the second main shaft 200 to the third main shaft 300, and then the power is transmitted to the drive shaft 400 through the central transmission part 8, thereby driving the walking part 11.

[0045] Preferably, Figure 3As shown, in an embodiment, the multiple working modes may also include a series drive mode. In the series drive mode, the first motor 5 may work as a generator, and the second motor 3 may work as a drive motor. The power of the engine 1 may be transmitted to the first motor 5 through the first main shaft 100. The first motor 5 may convert the power into electricity and transmit it to the battery 13 of the tractor. The battery 13 may supply power to the second motor 3, and the power of the second motor 3 may be transmitted to the sun gear 41 of the planetary gear 4. The power at the planetary gear 4 may be transmitted to the second main shaft 200 through the planetary carrier 42. The first clutch assembly 601 or the second clutch assembly 602 in the power shifting part 6 is combined, so that the power on the second main shaft 200 is transmitted to the third main shaft 300, and then the power is transmitted to the drive shaft 400 through the central transmission part 8, thereby driving the walking part 11. In this way, the speed of the engine 1 can be in the best economic range.

[0046] Preferably, Figure 4 As shown, in the embodiment, the multiple working modes may also include a parallel drive mode. In the parallel drive mode, the first motor 5 may work as a generator, and the second motor 3 may work as a drive motor. A part of the power of the engine 1 may be transmitted to the first motor 5 through the first main shaft 100, and another part of the power of the engine 1 may be transmitted to the outer gear ring 43 of the planetary gear 4 through the first main shaft 100. The first motor 5 may convert power into electricity and transmit it to the battery 13 of the tractor. The battery 13 may supply power to the second motor 3, and the power of the second motor 3 may be transmitted to the sun gear 41 of the planetary gear 4. The power at the planetary gear 4 may be transmitted to the second main shaft 200 through the planet carrier 42. The first clutch assembly 601 or the second clutch assembly 602 in the power shifting part 6 is combined, so that the power on the second main shaft 200 is transmitted to the third main shaft 300, and then the power is transmitted to the drive shaft 400 through the central transmission part 8, thereby driving the walking part 11. In this way, the speed of the engine 1 can be in the best economic range.

[0047] Preferably, Figure 5 As shown, in an embodiment, the multiple working modes may also include an energy recovery mode. In the energy recovery mode, the engine 1 is idling, and the second motor 3 may work as a generator. The power of the walking part 11 may be transmitted to the central transmission part 8 through the drive shaft 400, and then transmitted to the third main shaft 300. In the power shifting part 6, the first clutch assembly 601 or the second clutch assembly 602 is combined so that the power on the third main shaft 300 can be transmitted to the second main shaft 200. The power on the second main shaft 200 is transmitted to the sun gear 41 through the planetary carrier 42 of the planetary gear 4, and finally transmitted to the second motor 3 through the shaft teeth. The second motor 3 can convert power into electricity and store it in the battery 13 to achieve energy recovery.

[0048] In addition, preferably, in the embodiment, when the tractor performs power reversing, the second motor 3 can generate reverse torque in advance, and then engage the second clutch assembly 602 in the power shifting unit 6 to achieve power reversing of the entire vehicle.

[0049] During use, the EMCVT hybrid powertrain system uses the first motor 5 and the second motor 3 to replace the static hydraulic unit in the hydraulic mechanical continuously variable transmission, thereby realizing power splitting and energy transmission of the engine 1, ensuring higher transmission efficiency, reducing costs and system complexity, and improving overall system reliability. It realizes hybrid power control of the tractor, improves the economy of the vehicle operation, and reduces emissions.

[0050] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An EMCVT hybrid power transmission system, provided on a tractor, characterized in that: The EMCVT hybrid powertrain system includes: an engine connected to the first end of the first main shaft; A first motor, drivingly connected to the first spindle; A planetary gear, drivingly connected to the first main shaft; A second motor is drivingly connected to the planetary gear; A power shifting unit, drivingly connected to the planetary gear; a central transmission unit, in transmission connection with the power shift unit; and The walking part is connected with the central transmission part in driving manner.

2. The EMCVT hybrid powertrain system according to claim 1, characterized in that: The planetary gear comprises: a sun gear, drivingly connected to the second motor; a planet carrier, drivingly connected to the power shifting portion; and The outer gear ring is drivingly connected to the first main shaft.

3. The EMCVT hybrid powertrain system according to claim 2, characterized in that: The EMCVT hybrid powertrain system further includes: A second main shaft is arranged in parallel with the first main shaft, and the second main shaft is connected to the planet carrier; and The third main shaft is arranged in parallel with the first main shaft, and the third main shaft is connected to the central transmission part.

4. The EMCVT hybrid powertrain system according to claim 3, characterized in that: The power shift unit comprises: A first driving gear, disposed on the second main shaft; A first driven gear is mounted on the third main shaft through a bearing, and the first driven gear is transmission-connected to the first driving gear; A second driving gear, disposed on the second main shaft; A second driven gear is mounted on the third main shaft through a bearing, and the second driven gear is drivingly connected to the second driving gear; A third driving gear, disposed on the second main shaft; a third driven gear mounted on the third main shaft via a bearing; An intermediate gear is arranged between the third driven gear and the third driving gear, and the third driven gear is transmission-connected with the third driving gear through the intermediate gear; a first clutch assembly, disposed on the third main shaft, the first clutch assembly being located between the first driven gear and the second driven gear, the first clutch assembly being selectively coupled to the first driven gear or the second driven gear; and The second clutch assembly is arranged on the third main shaft, and the second clutch assembly can be combined with the third driven gear.

5. The EMCVT hybrid powertrain system according to claim 4, characterized in that: The EMCVT hybrid powertrain system further includes: A driving shaft is arranged perpendicular to the first main shaft, the central transmission part is arranged in the middle of the driving shaft, and the walking parts are arranged at both ends of the driving shaft; An end brake component is provided on the driving shaft, and the end brake component is located between the central transmission part and the walking part; A terminal deceleration component is arranged on the driving shaft, and the terminal deceleration component is located between the terminal braking component and the walking part; A PTO assembly, drivingly connected to the second end of the first main shaft; a front drive component, disposed on the third main shaft, the front drive component being located between the power shifting portion and the central transmission portion; and A torsional vibration damper is arranged on the first main shaft, and the torsional vibration damper is located on the side of the engine.

6. A control method for an EMCVT hybrid powertrain system, characterized in that: The control method of the EMCVT hybrid transmission system is implemented using the EMCVT hybrid transmission system described in claim 5, and the control method of the EMCVT hybrid transmission system includes: operating one or more of the first motor, the second motor, and the engine, and combining one of the first clutch assembly or the second clutch assembly to achieve multiple operating modes.

7. The control method of the EMCVT hybrid powertrain system according to claim 6, characterized in that: The multiple working modes include a pure electric drive mode. In the pure electric drive mode, the first motor and the second motor work as drive motors. The power of the first motor is transmitted to the first main shaft and then to the outer ring gear of the planetary gear row. The power of the second motor is transmitted to the sun gear of the planetary gear row. The power at the planetary gear row is transmitted to the second main shaft through the planetary carrier. The first clutch assembly or the second clutch assembly of the power shifting part is combined to transmit the power on the second main shaft to the third main shaft, and then transmit the power to the drive shaft through the central transmission part, thereby driving the walking part.

8. The control method of the EMCVT hybrid powertrain system according to claim 6, characterized in that: The multiple working modes include a series drive mode, in which the first motor works as a generator and the second motor works as a drive motor. The power of the engine is transmitted to the first motor through the first main shaft, and the first motor converts the power into electricity and transmits it to the second motor. The power of the second motor is transmitted to the sun gear of the planetary gear row, and the power at the planetary gear row is transmitted to the second main shaft through the planetary carrier. The first clutch assembly or the second clutch assembly of the power shifting part is combined to transmit the power on the second main shaft to the third main shaft, and then the power is transmitted to the drive shaft through the central transmission part, thereby driving the walking part.

9. The control method of the EMCVT hybrid powertrain system according to claim 6, characterized in that: The multiple working modes include a parallel drive mode, in which the first motor works as a generator and the second motor works as a drive motor, a part of the power of the engine is transmitted to the first motor through the first main shaft, and another part of the power of the engine is transmitted to the outer gear ring of the planetary gear row through the first main shaft, the first motor converts the power into electricity and transmits it to the second motor, the power of the second motor is transmitted to the sun gear of the planetary gear row, and the power at the planetary gear row is transmitted to the second main shaft through the planetary carrier, the first clutch assembly or the second clutch assembly of the power shifting part is combined, so that the power on the second main shaft is transmitted to the third main shaft, and then the power is transmitted to the drive shaft through the central transmission part, thereby driving the walking part.

10. The control method of the EMCVT hybrid powertrain system according to claim 6, characterized in that: The multiple working modes include an energy recovery mode. In the energy recovery mode, the engine is idling, the second motor works as a generator, the power of the walking part is transmitted to the central transmission part through the drive shaft, and then transmitted to the third main shaft, the first clutch assembly or the second clutch assembly of the power shift part is engaged, so that the power on the third main shaft is transmitted to the second main shaft, and then transmitted to the second motor through the planetary gear, and the second motor converts the power into electricity and stores it in the battery.

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