Multi-mode hybrid drive system and control method

Abstract

This invention discloses a multi-mode hybrid drive system and control method. In this system, an engine is connected to the first transmission end of a planetary gear train assembly, allowing the engine to drive the first transmission end to rotate unidirectionally around its central axis. A first motor is fixedly connected to the second transmission end of the planetary gear train assembly. The output end of the planetary gear train assembly can connect to or disconnect from the first wheel assembly of the vehicle body, and can also connect to or disconnect from the vehicle frame. A second motor can connect to or disconnect from the second wheel assembly of the vehicle body. The first and second wheel assemblies are spaced apart along the length of the vehicle body. The power battery can selectively connect to both the first and second motors, and the first motor can selectively connect to the second motor. This system allows for speed and torque adjustment of the engine across the entire speed range, resulting in high drive efficiency. It avoids magnetic losses caused by idling in the first and second motors, has a simple structure, and reduces energy consumption.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a multi-mode hybrid drive system and control method. Background Art

[0002] With the continuous consumption of non-renewable fuels, global warming, and increasing environmental pollution in recent years, hybrid vehicles, as an important form of energy-saving and new energy vehicles, have received widespread attention and application. As hybrid vehicles become increasingly popular, and as people's demands for comprehensive vehicle performance, including power, economy, off-road capability, and comfort, four-wheel-drive hybrid vehicles are gaining increasing market favor. Among these, the multi-mode hybrid drive system is a crucial component of four-wheel-drive hybrid vehicles.

[0003] Existing multi-mode hybrid drive systems utilize the combined operation of an electric motor and an engine to achieve various driving modes, including pure electric drive, engine drive, and a hybrid of electric motor and engine drive. However, existing multi-mode hybrid drive systems are structurally complex, have numerous components, are costly, and exhibit low drive efficiency and high energy consumption. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-mode hybrid drive system and control method to solve the problems of complex structure, large number of parts, high cost, low drive efficiency and high energy consumption in the existing multi-mode hybrid drive system.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A multi-mode hybrid drive system, comprising a first drive mechanism, a power battery, and a second drive mechanism;

[0007] The first drive mechanism includes an engine, a first motor, and a planetary gear system assembly. The engine is connected to the first transmission end of the planetary gear system assembly, and the engine can drive the first transmission end to rotate unidirectionally around its own central axis. The first motor is fixedly connected to the second transmission end of the planetary gear system assembly. The output end of the planetary gear system assembly can be connected to or separated from the first wheel set of the vehicle body, and the output end of the planetary gear system assembly can be connected to or separated from the vehicle frame.

[0008] The second drive mechanism includes a second motor, which can be connected to or disconnected from the second wheel set of the vehicle body. The first wheel set and the second wheel set are distributed at intervals along the length direction of the vehicle body.

[0009] The power battery can be selectively electrically connected to the first motor and the second motor, and the first motor can be selectively electrically connected to the second motor.

[0010] Preferably, the planetary gear train assembly includes a planet carrier, planet gears fixedly mounted on the planet carrier, a sun gear meshing with the planet gears, and a ring gear meshing with the planet gears. The engine is connected to the planet carrier and can drive the planet carrier to rotate unidirectionally around its own central axis. The first motor is fixedly connected to the sun gear.

[0011] The first drive mechanism further includes a transmission gear train that meshes with the gear ring. The output end of the transmission gear train can be connected to or disconnected from the first wheel set, and the output end of the transmission gear train can be connected to or disconnected from the vehicle frame.

[0012] Preferably, the first drive mechanism further includes a one-way clutch, the input end of which is connected to the output end of the engine, and the output end of which is connected to the planetary carrier.

[0013] Preferably, the first drive mechanism further includes a first connection separation structure and a second connection separation structure, wherein the first connection separation structure is used to connect the output end of the transmission wheel system to the first wheel set, and the second connection separation structure is used to connect the output end of the transmission wheel system to the vehicle frame.

[0014] Preferably, the first connection and separation structure is a clutch; the second connection and separation structure is a clutch.

[0015] Preferably, the second drive mechanism further includes a third connection and separation structure for connecting the second motor and the second wheel assembly.

[0016] Preferably, the first drive mechanism, the power battery, and the second drive mechanism are distributed at intervals along the length of the vehicle body.

[0017] A control method for a multi-mode hybrid drive system, implemented in the aforementioned multi-mode hybrid drive system, the control method comprising:

[0018] Parking power generation: Control the output end of the planetary gear train assembly to separate from the first wheel set; control the output end of the planetary gear train assembly to connect to the frame; the engine drives the planetary gear train assembly, so that the first motor generates electricity and stores it in the power battery;

[0019] Pure electric front-wheel drive: The output end of the planetary gear system is connected to the first wheel set; the output end of the planetary gear system is disconnected from the vehicle frame; the second motor is disconnected from the second wheel set; the power battery provides electrical energy to the first motor to drive the planetary gear system.

[0020] Pure electric rear-wheel drive; controlling the output end of the planetary gear system assembly to separate from the first wheel set; controlling the output end of the planetary gear system assembly to connect or disconnect from the frame; controlling the second motor to connect to the second wheel set; the power battery provides electrical energy to the second motor to drive the second wheel set;

[0021] Pure electric four-wheel drive: The output end of the planetary gear system is connected to the first wheel assembly; the output end of the planetary gear system is disconnected from the vehicle frame; the second motor is connected to the second wheel assembly; the power battery provides electrical energy to the first motor to drive the planetary gear system; the power battery provides electrical energy to the second motor to drive the second wheel assembly.

[0022] Engine-driven power generation: The output end of the planetary gear system is connected to the first wheel set; the output end of the planetary gear system is disconnected from the frame; the second motor is disconnected from the second wheel set; the engine drives the planetary gear system, thereby driving the first wheel set and the electricity generated by the first motor is stored in the power battery;

[0023] Engine direct drive - front drive: Control the output end of the planetary gear system assembly to connect to the first wheel set; control the output end of the planetary gear system assembly to disconnect from the frame; control the second motor to disconnect from the second wheel set; the engine drives the first transmission end of the planetary gear system assembly, and the power battery provides electrical energy to the first motor to drive the second transmission end of the planetary gear system assembly;

[0024] Extended-range generator rear drive: The output end of the planetary gear train assembly is controlled to separate from the first wheel set; the output end of the planetary gear train assembly is controlled to connect to the frame; the second motor is controlled to connect to the second wheel set; the engine drives the planetary gear train assembly, causing the first motor to generate electricity; the second motor drives the second wheel set.

[0025] Engine direct drive power generation - four-wheel drive: The output end of the planetary gear system assembly is connected to the first wheel set; the output end of the planetary gear system assembly is disconnected from the frame; the second motor is connected to the second wheel set; the engine drives the planetary gear system assembly, thereby driving the first wheel set and generating electricity with the first motor; the second motor drives the second wheel set.

[0026] Engine direct drive - four-wheel drive: Controlling the output end of the planetary gear system assembly to connect to the first wheel set; controlling the output end of the planetary gear system assembly to disconnect from the vehicle frame; controlling the second motor to connect to the second wheel set; the engine drives the first transmission end of the planetary gear system assembly, and the power battery provides electrical energy to the first motor to drive the second transmission end of the planetary gear system assembly; the power battery also provides electrical energy to the second motor to drive the second wheel set;

[0027] Braking power generation: Controlling the output end of the planetary gear train assembly to connect to the first wheel set; controlling the output end of the planetary gear train assembly to separate from the vehicle frame; controlling the second motor to connect to the second wheel set; the vehicle's motion inertia drives the planetary gear train assembly to move, driving the first motor to generate electricity stored in the power battery, and simultaneously driving the second motor to generate electricity stored in the power battery.

[0028] Preferably, in the extended-range generator rear-wheel drive and the engine direct-drive generator-four-wheel drive, the step between the first motor generating electricity and the second motor driving the second wheel set is further included:

[0029] The first motor is electrically connected to the second motor, and the first motor supplies power to the second motor.

[0030] Preferably, the power of the first motor is less than the power of the second motor.

[0031] The beneficial effects of this invention are:

[0032] The present invention aims to provide a multi-mode hybrid drive system and control method. The multi-mode hybrid drive system includes a first drive mechanism, a power battery, and a second drive mechanism. An engine in the first drive mechanism is connected to a first transmission end of a planetary gear train assembly. The engine can drive the first transmission end to rotate unidirectionally around its central axis. A first motor is fixedly connected to the second transmission end of the planetary gear train assembly. It is understood that the engine can only drive the first transmission end to rotate unidirectionally around its central axis. The output shaft of the first motor can rotate forward or backward, and the output shaft of the second motor can rotate forward or backward. Furthermore, the output end of the planetary gear train assembly can be connected to or disconnected from the first wheel assembly of the vehicle body, the output end of the planetary gear train assembly can be connected to or disconnected from the vehicle frame, and the second motor can be connected to or disconnected from the second wheel assembly of the vehicle body. It is understood that the connection relationship between the output end of the planetary gear train assembly and the first wheel assembly, the connection relationship between the output end of the planetary gear train assembly and the vehicle frame, and the connection relationship between the second motor and the second wheel assembly can be adjusted according to driving and power generation requirements. Additionally, a power battery is provided... The battery can selectively connect to the first and second motors. When the first and second motors are used for driving, the power battery can provide electrical energy to them. When the first and second motors generate electricity, the electrical energy can be stored in the power battery. The first motor can also selectively connect to the second motor. When the first motor generates electricity and the second motor is used for driving, the electrical energy of the first motor can also be used to provide electrical energy to the second motor. This configuration allows the vehicle to achieve multiple operating modes, including parking power generation, pure electric front-wheel drive, pure electric rear-wheel drive, pure electric four-wheel drive, engine-generated front-wheel drive, engine direct drive-front drive, extended-range power generation rear-wheel drive, engine direct drive-generated four-wheel drive, engine direct drive-four-wheel drive, and braking power generation. This allows for both speed and torque adjustment of the engine across the entire speed range, improving engine driving efficiency and increasing vehicle range. Furthermore, compared to existing technologies, this design avoids magnetic losses caused by idling of the first and second motors and energy consumption caused by reverse rotation of the engine. It also features a simple structure, reduced number of parts, low cost, improved driving efficiency, and reduced energy consumption. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a multi-mode hybrid drive system provided in a specific embodiment of the present invention.

[0034] In the picture:

[0035] 100. First wheel set; 200. Second wheel set; 300. Frame;

[0036] 1. First drive mechanism; 11. Engine; 12. First motor; 13. Planetary gear train assembly; 131. Planet carrier; 132. Planet gears; 133. Sun gear; 134. Ring gear; 14. Transmission gear train; 15. One-way clutch; 16. First connection and separation structure; 17. Second connection and separation structure;

[0037] 2. Power battery;

[0038] 3. Second drive mechanism; 31. Second motor; 32. Third connecting and separating structure. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0043] Existing multi-mode hybrid drive systems utilize the combined operation of an electric motor and an engine to achieve various driving modes, including pure electric drive, engine drive, and a hybrid of electric motor and engine drive. However, existing multi-mode hybrid drive systems are structurally complex, have numerous components, are costly, and exhibit low drive efficiency and high energy consumption.

[0044] Therefore, this invention provides a multi-mode hybrid drive system, such as... Figure 1 As shown, the multi-mode hybrid drive system includes a first drive mechanism 1, a power battery 2, and a second drive mechanism 3. The first drive mechanism 1 includes an engine 11, a first motor 12, and a planetary gear train assembly 13. The engine 11 is connected to the first transmission end of the planetary gear train assembly 13, and the engine 11 can drive the first transmission end to rotate unidirectionally around its own central axis. The first motor 12 is fixedly connected to the second transmission end of the planetary gear train assembly 13. The output end of the planetary gear train assembly 13 can be connected to or disconnected from the first wheel set 100 of the vehicle body, and the output end of the planetary gear train assembly 13 can be connected to or disconnected from the vehicle frame 300. The second drive mechanism 3 includes a second motor 31, which can be connected to or disconnected from the second wheel set 200 of the vehicle body. The first wheel set 100 and the second wheel set 200 are spaced apart along the length of the vehicle body. The power battery 2 can be selectively electrically connected to the first motor 12 and the second motor 31, and the first motor 12 can be selectively electrically connected to the second motor 31.

[0045] like Figure 1As shown, in this multi-mode hybrid drive system, the engine 11 of the first drive mechanism 1 is connected to the first transmission end of the planetary gear system 13. The engine 11 can drive the first transmission end to rotate unidirectionally around its own central axis. The first motor 12 is fixedly connected to the second transmission end of the planetary gear system 13. It can be understood that the engine 11 can only drive the first transmission end to rotate unidirectionally around its own central axis. The output shaft of the first motor 12 can rotate forward or backward, and the output shaft of the second motor 11 can rotate forward or backward. Furthermore, the output end of the planetary gear system 13 can be connected to the vehicle body. The first wheel assembly 100 can be connected or disconnected, the output end of the planetary gear train assembly 13 can be connected or disconnected from the vehicle frame 300, and the second motor 31 can be connected or disconnected from the second wheel assembly 200. It is understood that the connection relationship between the output end of the planetary gear train assembly 13 and the first wheel assembly 100, the connection relationship between the output end of the planetary gear train assembly 13 and the vehicle frame 300, and the connection relationship between the second motor 31 and the second wheel assembly 200 can be adjusted according to driving and power generation requirements. Furthermore, the power battery 2 is configured to selectively connect to the first motor 12 and the second motor 200. The first motor 12 and the second motor 31 are electrically connected. When the first motor 12 and the second motor 31 are used as drives, the power battery 2 can provide electrical energy to the first motor 12 and the second motor 31. When the first motor 12 and the second motor 31 generate electricity, the electrical energy can be stored in the power battery 2. The first motor 12 can selectively connect to the second motor 31. When the first motor 12 generates electricity and the second motor 31 is used as a drive, the electrical energy of the first motor 12 can also be used to provide electrical energy to the second motor 31. This configuration allows the vehicle to achieve stationary power generation, pure electric front-wheel drive, pure electric rear-wheel drive, pure electric four-wheel drive, and engine-driven power generation. Multiple operating modes, including electric front-wheel drive, engine direct drive-front-wheel drive, extended-range generator rear-wheel drive, engine direct drive generator-four-wheel drive, engine direct drive-four-wheel drive, and brake generator, enable the engine 11 to adjust both speed and torque across the entire speed range, improving the driving efficiency of the engine 11 and increasing the vehicle's driving range. Secondly, compared with existing technologies, it can avoid the magnetic losses caused by the first motor 12 and the second motor 31 due to idling, and can avoid the energy consumption caused by the engine 11 being rotated in the opposite direction. Moreover, the structure is simple, the number of parts is reduced, the cost is low, driving efficiency is improved, and energy consumption is reduced.

[0046] Among them, such as Figure 1As shown, the planetary gear train assembly 13 includes a planet carrier 131, planet gears 132 fixedly mounted on the planet carrier 131, a sun gear 133 meshing with the planet gears 132, and a ring gear 134 meshing with the planet gears 132. The engine 11 is connected to the planet carrier 131 and can drive the planet carrier 131 to rotate unidirectionally around its own central axis. The first motor 12 is fixedly connected to the sun gear 133. The first drive mechanism 1 also includes a transmission gear train 14 meshing with the ring gear 134. The output end of the transmission gear train 14 can be connected to or separated from the first wheel set 100, and the output end of the transmission gear train 14 can be connected to or separated from the frame 300. Specifically, in this embodiment, the transmission gear train 14 includes a transmission gear. One end of the axle of the transmission gear can be connected to or separated from the first wheel set 100, and the other end of the axle of the transmission gear can be connected to or separated from the frame 300. Specifically, when the engine 11 drives the planetary carrier 131 to rotate unidirectionally around its central axis, the planetary gears 132 mesh with the sun gear 133 and the ring gear 134, and the ring gear 134 also meshes with the transmission gear, thereby driving the first wheel assembly 100 to rotate. When the first motor 12 acts as the drive, both the first motor 12 and the engine 11 drive the sun gear 133 to rotate around its central axis. Compared with the prior art, this design is simple in structure, low in cost, and effectively improves transmission efficiency.

[0047] Specifically, if Figure 1 As shown, the first drive mechanism 1 also includes a one-way clutch 15. The input end of the one-way clutch 15 is connected to the output shaft of the engine 11, and the output end of the one-way clutch 15 is connected to the planetary carrier 131. This configuration ensures that the engine 11 can only drive the planetary carrier 131 to rotate unidirectionally around its own central axis, avoiding energy consumption caused by the engine 11 being rotated in the opposite direction. Secondly, when the first motor 12 is used as the drive, and the rotation direction of the output shaft of the first motor 12 is opposite to the rotation direction of the output shaft of the engine 11, it will not cause the engine 11 to rotate in reverse, thus improving the performance of the engine 11. It is understood that other transmission structures can also be used to achieve unidirectional rotation of the output shaft of the engine 11. For example, if the output shaft of the engine 11 is directly connected to the planetary carrier 131, it can also drive the vehicle.

[0048] Specifically, if Figure 1As shown, the first drive mechanism 1 further includes a first connecting / disconnecting structure 16 and a second connecting / disconnecting structure 17. The first connecting / disconnecting structure 16 connects the output end of the transmission gear train 14 to the first wheel set 100, and the second connecting / disconnecting structure 17 connects the output end of the transmission gear train 14 to the frame 300. This configuration allows the transmission gear to connect or disconnect with the first wheel set 100 and the frame 300. Specifically, in this embodiment, the first connecting / disconnecting structure 16 is a clutch; the second connecting / disconnecting structure 17 is a clutch. Preferably, both the first connecting / disconnecting structure 16 and the second connecting / disconnecting structure 17 are electromagnetic clutches. It is understood that other structures can also be used to achieve the connection or disconnection of the transmission gear with the first wheel set 100 and the frame 300. For example, if one end of the transmission gear is rotatably connected to the vehicle body along the axial direction, and the other end is connected to the first wheel set 100, and the second motor 31 is connected to the second wheel set 200, the vehicle can also be driven.

[0049] Specifically, a first deceleration differential device is also provided between the first connecting separation structure 16 and the first wheel set 100.

[0050] Among them, such as Figure 1 As shown, the second drive mechanism 3 also includes a third connection / separation structure 32, which is used to connect the second motor 31 and the second wheel set 200. This arrangement allows the second motor 31 and the second wheel set 200 to be connected or separated. Specifically, in this embodiment, the third connection / separation structure 32 is also a clutch. Preferably, the third connection / separation structure 32 is an electromagnetic clutch. It is understood that other structures can also be used, as long as they enable the second motor 31 and the second wheel set 200 to be connected or separated. Specifically, a second reduction differential device is also provided between the third connection / separation structure 32 and the second wheel set 200.

[0051] Preferably, such as Figure 1 As shown, the first drive mechanism 1, the power battery 2, and the second drive mechanism 3 are distributed at intervals along the length of the vehicle body. This improves space utilization and facilitates wiring layout.

[0052] The multi-mode hybrid drive system also includes a controller, which is electrically connected to the engine 11, the first motor 12, the second motor 31, and the power battery 2. The controller can control the operation of the engine 11, selectively connect the power battery 2 to the first motor 12 and / or the second motor 31, and control the connection or disconnection of the first motor 12 and the second motor 31. Specifically, the controller is also electrically connected to the first connection / disconnection structure 16, the second connection / disconnection structure 17, and the third connection / disconnection structure 32. The controller can control the first connection / disconnection structure 16 to be in a connected or disconnected state, control the second connection / disconnection structure 17 to be in a connected or disconnected state, and control the third connection / disconnection structure 32 to be in a connected or disconnected state.

[0053] Specifically, one of the first wheel set 100 and the second wheel set 200 is the front wheel set, and the other is the rear wheel set. It is understood that the first drive mechanism 1 can be located in one of the front and rear wheel sets, and the second drive mechanism 3 can be located in the other. This configuration improves the versatility and practicality of the multi-mode hybrid drive system. In this embodiment, the first wheel set 100 is exemplarily the front wheel set, the first drive mechanism 1 is located in the front wheel set, the second wheel set 200 is the rear wheel set, and the second drive mechanism 3 is located in the rear wheel set. As an alternative, the first wheel set 100 is the rear wheel set, the first drive mechanism 1 is located in the rear wheel set, the second wheel set 200 is the front wheel set, and the second drive mechanism 3 is located in the front wheel set.

[0054] The present invention also provides a control method for a multi-mode hybrid drive system, which is used to implement the above-mentioned multi-mode hybrid drive system. The control method for the multi-mode hybrid drive system includes: parking power generation, pure electric front drive, pure electric rear drive, pure electric four-wheel drive, engine power generation front drive, engine direct drive-front drive, range extension power generation rear drive, engine direct drive power generation-four-wheel drive, engine direct drive-four-wheel drive, and braking power generation.

[0055] Specifically, in this embodiment, the output shaft of the engine 11 rotates in a first clockwise direction, which is in the same direction as the rotation of the planetary carrier 131; the output shaft of the first motor 12 can rotate in both a first clockwise direction and a second clockwise direction, which are opposite to each other.

[0056] Parking power generation: The output end of the planetary gear train assembly 13 is separated from the first wheel set 100; the output end of the planetary gear train assembly 13 is connected to the frame 300; the engine 11 drives the planetary gear train assembly 13, causing the first motor 12 to generate electricity and store it in the power battery 2. Specifically, when the vehicle's operating mode is parking power generation mode, the first connection separation structure 16 is in a separated state, the second connection separation structure 17 is in a connected state, the transmission gear and the ring gear 134 are fixed, the output shaft of the engine 11 rotates in a first clockwise direction and drives the planet carrier 131 and planetary gears 132 to rotate synchronously, the planetary gears 132 mesh with the sun gear 133 and the ring gear 134, the sun gear 133 drives the first motor 12 to rotate in a second clockwise direction, thereby driving the first motor 12 to generate electricity and store it in the power battery 2. During this process, the ring gear 134 also meshes with the transmission gear, and the transmission gear rotates freely. This setting can improve the safety performance of the vehicle in parking power generation mode.

[0057] Specifically, the steps for the first motor 12 to generate electricity and store it in the power battery 2 include:

[0058] The first motor 12 generates electricity; the control power battery 2 is electrically connected to the first motor 12; the first motor 12 stores electrical energy in the power battery 2.

[0059] Specifically, when the vehicle is in parking and power generation mode, the third connection / disconnection structure 32 can be controlled to be in either a connected or disconnected state. Neither will affect the power generation of the first motor 12.

[0060] Pure electric front-wheel drive: The output end of the planetary gear train assembly 13 is connected to the first wheel set 100; the output end of the planetary gear train assembly 13 is separated from the frame 300; the second motor 31 is separated from the second wheel set 200; the power battery 2 provides electrical energy to the first motor 12 to drive the planetary gear train assembly 13. Specifically, when the vehicle's operating mode is pure electric front-wheel drive mode, the first connection / separation structure 16 is connected, the second connection / separation structure 17 is separated, and the third connection / separation structure 32 is separated. The power battery 2 provides electrical energy to the first motor 12, and the output shaft of the first motor 12 rotates in the second clockwise direction, driving the sun gear 133 to rotate. The sun gear 133 meshes with the planet gears 132, the planet gears 132 also mesh with the ring gear 134, and the ring gear 134 also meshes with the transmission gear, thereby driving the first wheel set 100 to rotate, and then driving the second wheel set 200 to rotate, thus achieving pure electric front-wheel drive. Understandably, during this process, the engine 11 and the second motor 31 do not work. The engine 11 is connected to the planetary carrier 131 through a one-way clutch 15, which can effectively avoid the energy consumption caused by the engine 11 being rotated in the opposite direction compared to the prior art.

[0061] The vehicle operates in a pure electric rear-wheel drive mode. Specifically, when the vehicle is in pure electric rear-wheel drive mode, the first connection / disconnection structure 16 is in a disconnected state, the second connection / disconnection structure 17 is in a connected or disconnected state, and the third connection / disconnection structure 32 is in a connected state. The power battery 2 provides electrical energy to the second motor 31, which in turn drives the second wheel set 200 to rotate, thereby driving the first wheel set 100 to rotate, thus achieving pure electric rear-wheel drive. It is understood that during this process, the engine 11 and the first motor 12 are not operating.

[0062] Pure electric four-wheel drive: The output end of the planetary gear train assembly 13 is connected to the first wheel set 100; the output end of the planetary gear train assembly 13 is separated from the frame 300; the second motor 31 is connected to the second wheel set 200; the power battery 2 provides electrical energy to the first motor 12 to drive the planetary gear train assembly 13; the power battery 2 provides electrical energy to the second motor 31 to drive the second wheel set 200. When the vehicle's operating mode is pure electric four-wheel drive mode, the first connection / separation structure 16 is connected, the second connection / separation structure 17 is separated, and the third connection / separation structure 32 is connected. The power battery 2 provides electrical energy to the first motor 12 and the second motor 31. The output shaft of the first motor 12 rotates in the second clockwise direction and drives the sun gear 133 to rotate. The sun gear 133 meshes with the planet gear 132, the planet gear 132 also meshes with the ring gear 134, and the ring gear 134 also meshes with the transmission gear, thereby driving the first wheel set 100 to rotate. The second motor 31 drives the second wheel set 200 to rotate, thus achieving pure electric four-wheel drive. Understandably, during this process, the engine 11 does not operate. The engine 11 is connected to the planetary carrier 131 via a one-way clutch 15, which effectively avoids energy consumption caused by the engine 11 being rotated in the opposite direction compared to the prior art.

[0063] The power of the first motor 12 is less than that of the second motor 31. When the vehicle is in pure electric four-wheel drive mode, the power of the first motor 12 is less than that of the second motor 31, which increases the grip of the rear wheel assembly, allowing the second motor 31 to exert its acceleration performance.

[0064] Engine-driven power generation: The output end of the planetary gear train assembly 13 is connected to the first wheel set 100; the output end of the planetary gear train assembly 13 is disconnected from the frame 300; the second motor 31 is disconnected from the second wheel set 200; the engine 11 drives the planetary gear train assembly 13, thereby driving the first wheel set 100 and the first motor 12 generates electricity that is stored in the power battery 2. Specifically, when the vehicle's operating mode is the engine 11 direct-drive power generation mode, the first connection / disconnection structure 16 is connected, the second connection / disconnection structure 17 is disconnected, and the third connection / disconnection structure 32 is disconnected. The output shaft of the engine 11 rotates in the first clockwise direction and drives the planet carrier 131 and planetary gears 132 to rotate synchronously. The planetary gears 132 mesh with the sun gear 133 and the ring gear 134. The ring gear 134 also meshes with the transmission gear to drive the first wheel set 100 to move. Secondly, the sun gear 133 also drives the first motor 12 to rotate in the second clockwise direction, thereby driving the first motor 12 to generate electricity that is stored in the power battery 2.

[0065] Specifically, when the vehicle is operating in engine-generator front-drive mode, the third connection / disconnection structure 32 can be controlled to be in either a connected or disconnected state. Neither will affect the power generation of the first motor 12.

[0066] More specifically, controlling the third connection / separation structure 32 to be in the connected state allows the second wheel assembly 200 to move while simultaneously driving the second motor 31 to generate electricity. The second motor 31 is then electrically connected to the power battery 2, and the generated electricity is stored in the power battery 2. Alternatively, controlling the third connection / separation structure 32 to be in the separated state allows the second wheel assembly 200 to move without affecting the power generation of the first motor 12.

[0067] Engine direct drive - front drive: The output end of the control planetary gear system assembly 13 is connected to the first wheel set 100; the output end of the control planetary gear system assembly 13 is separated from the frame 300; the control second motor 31 is separated from the second wheel set 200; the engine 11 drives the first transmission end of the planetary gear system assembly 13, and the power battery 2 provides electrical energy to the first motor 12 to drive the second transmission end of the planetary gear system assembly 13. Specifically, when the vehicle operates in engine direct drive / front-wheel drive mode, the first connection / disconnection structure 16 is connected, the second connection / disconnection structure 17 is disconnected, and the third connection / disconnection structure 32 is disconnected. The output shaft of the engine 11 drives the planetary carrier 131 to rotate in the first clockwise direction. The power battery 2 provides electrical energy to the first motor 12. The output shaft of the first motor 12 rotates in the second clockwise direction and drives the sun gear 133 to rotate. The sun gear 133 meshes with the planetary gears 132, which also mesh with the ring gear 134. The ring gear 134 also meshes with the transmission gear, thereby driving the first wheel set 100 to rotate, and then driving the second wheel set 200 to rotate, thus achieving engine direct drive / front-wheel drive. It is understood that the second motor 31 does not work during this process. The engine 11 and the planetary carrier 131 are connected through a one-way clutch 15, which effectively avoids energy consumption caused by the engine 11 being rotated in the opposite direction compared to existing technologies.

[0068] Extended-range generator rear-wheel drive: The output end of the planetary gear train assembly 13 is separated from the first wheel set 100; the output end of the planetary gear train assembly 13 is connected to the frame 300; the second motor 31 is connected to the second wheel set 200; the engine 11 drives the planetary gear train assembly 13, causing the first motor 12 to generate electricity; the second motor 31 drives the second wheel set 200. Specifically, when the vehicle's operating mode is extended-range generator rear-wheel drive mode, the first connection separation structure 16 is in a separated state, the second connection separation structure 17 is in a connected state, the third connection separation structure 32 is in a connected state, the transmission gear and the ring gear 134 are fixed, the output shaft of the engine 11 drives the planet carrier 131 to rotate in the first clockwise direction, the sun gear 133 meshes with the planet gear 132, the sun gear 133 drives the output shaft of the first motor 12 to rotate in the second clockwise direction, so as to drive the first motor 12 to generate electricity; at the same time, the second motor 31 drives the second wheel set 200 to move.

[0069] Specifically, the process between the first motor 12 generating electricity and the second motor 31 driving the second wheel set 200 also includes the following steps:

[0070] The first motor 12 is electrically connected to the second motor 31, and the first motor 12 supplies power to the second motor 31.

[0071] It is understandable that the first motor 12 generates electricity and prioritizes it to the second motor 31, so that the second motor 31 drives the second wheel set 200 to move.

[0072] Engine direct drive power generation - four-wheel drive: The output end of the control planetary gear system assembly 13 is connected to the first wheel set 100; the output end of the control planetary gear system assembly 13 is separated from the frame 300; the control second motor 31 is connected to the second wheel set 200; the engine 11 drives the planetary gear system assembly 13, thereby driving the first wheel set 100 and generating electricity with the first motor 12; the second motor 31 drives the second wheel set 200. Specifically, when the vehicle operates in engine direct drive power generation-four-wheel drive mode, the first connection-disconnection structure 16 is connected, the second connection-disconnection structure 17 is disconnected, and the third connection-disconnection structure 32 is connected. The output shaft of the engine 11 drives the planetary carrier 131 to rotate in the first clockwise direction. The sun gear 133 meshes with the planetary gear 132, the planetary gear 132 also meshes with the ring gear 134, and the ring gear 134 also meshes with the transmission gear, thereby driving the first wheel set 100 to rotate. At the same time, the sun gear 133 drives the output shaft of the first motor 12 to rotate in the second clockwise direction to drive the first motor 12 to generate electricity. At the same time, the second motor 31 drives the second wheel set 200 to move.

[0073] Specifically, the process between the first motor 12 generating electricity and the second motor 31 driving the second wheel set 200 also includes the following steps:

[0074] The first motor 12 is electrically connected to the second motor 31, and the first motor 12 supplies power to the second motor 31.

[0075] It is understandable that the first motor 12 generates electricity and prioritizes it to the second motor 31, so that the second motor 31 drives the second wheel set 200 to move.

[0076] Engine direct drive - four-wheel drive: The output end of the planetary gear system assembly 13 is connected to the first wheel set 100; the output end of the planetary gear system assembly 13 is separated from the frame 300; the second motor 31 is connected to the second wheel set 200; the engine 11 drives the first transmission end of the planetary gear system assembly 13, and the power battery 2 provides electrical energy to the first motor 12 to drive the second transmission end of the planetary gear system assembly 13; the power battery 2 also provides electrical energy to the second motor 31 to drive the second wheel set 200. Specifically, when the vehicle operates in the engine 11 direct drive-front drive-rear drive mode, the first connection / disconnection structure 16 is connected, the second connection / disconnection structure 17 is disconnected, and the third connection / disconnection structure 32 is connected. The engine 11 is connected to the planetary carrier 131, and the power battery 2 provides electrical energy to the first motor 12 and the second motor 31. The first motor 12 is connected to the sun gear 133. The output shaft of the engine 11 drives the planetary carrier 131 to rotate in the first clockwise direction. The sun gear 133 meshes with the planet gear 132, the planet gear 132 also meshes with the ring gear 134, and the ring gear 134 also meshes with the transmission gear. The first motor 12 also drives the sun gear 133 to rotate in the second clockwise direction, thereby driving the first wheel set 100 to rotate. At the same time, the second motor 31 drives the second wheel set 200 to move.

[0077] Braking power generation: The output end of the planetary gear system assembly 13 is connected to the first wheel set 100; the output end of the planetary gear system assembly 13 is separated from the frame 300; the second motor 31 is connected to the second wheel set 200; the vehicle's motion inertia drives the planetary gear system assembly 13 to move, driving the first motor 12 to generate electricity stored in the power battery 2, and simultaneously driving the second motor 31 to generate electricity stored in the power battery 2. Specifically, when the vehicle operates in braking-generating mode, the first connection / disconnection structure 16 is connected, the second connection / disconnection structure 17 is disconnected, and the third connection / disconnection structure 32 is connected. The inertial force of the vehicle during driving drives the first wheel assembly 100 and the second wheel assembly 200 to rotate. Simultaneously, the first wheel assembly 100 drives the transmission gear to mesh with the ring gear 134, which in turn meshes with the planetary gear 132. The planetary gear 132 also meshes with the sun gear 133. The sun gear 133 rotates and drives the first motor 12 to generate electricity, controlling the first motor 12 to be electrically connected to the power battery 2. The electricity generated by the first motor 12 is stored in the power battery 2. Simultaneously, the second wheel assembly 200 drives the second motor 31 to generate electricity, controlling the second motor 31 to be electrically connected to the power battery 2. The electricity generated by the second motor 31 is stored in the power battery 2. Therefore, when the vehicle is moving under inertial force, the power battery 2 can be charged through the first motor 12 and the second motor 31.

[0078] Therefore, operating the aforementioned multi-mode hybrid drive system using the control method described above has the following advantages:

[0079] 1. When the first motor 12 and / or the second motor 31 drive the vehicle, a one-way clutch 15 is provided between the engine 11 and the planetary carrier 131, which can effectively avoid the energy consumption caused by the engine 11 being rotated in the opposite direction.

[0080] Second, the power of the first motor 12 is less than that of the second motor 31. When the vehicle is in pure electric four-wheel drive mode, it can increase the grip of the rear wheel assembly, allowing the second motor 31 to exert its acceleration performance.

[0081] Third, when the vehicle is driving in pure electric mode, the first motor 12 and / or the second motor 31 can be driven according to the actual working conditions and required power, thereby ensuring that both the first motor 12 and the second motor 31 can work in the high-efficiency range and reducing the output power requirements of the first motor 12 and the second motor 31. In particular, in this embodiment, the second wheel set 200 is the rear wheel set, and the second motor 31 is the rear drive motor, which can reduce the structural size of the second motor 31 and further reduce costs.

[0082] Secondly, when the vehicle is driving in pure electric mode, the first motor 12 and the second motor 31 work together to cover the entire speed range. If the power battery 2 is a high-capacity, high-rate battery, the vehicle can travel a long distance in pure electric mode. If the power battery 2 supports fast and slow charging and high-power external discharge, the pure electric driving range and application scenarios can be further expanded.

[0083] Secondly, the working state of the first motor 12 and the second motor 31 can be switched in real time according to the actual working conditions to avoid the problem of excessive heat generation caused by a single motor working for a long time.

[0084] Fourth, when the vehicle is traveling at high speed, it can adopt pure electric rear-wheel drive mode, pure electric four-wheel drive mode, range-extended generator rear-wheel drive mode, and engine direct drive-four-wheel drive mode. This can save 1 / 1 liter of engine fuel without affecting the vehicle's driving power.

[0085] When the engine 11, the first motor 12, and the second motor 31 work together to drive the vehicle, that is, when the vehicle is in engine direct drive-four drive mode, the multi-mode hybrid drive system can output maximum power.

[0086] Fifth, in any working mode, it can avoid magnetic losses caused by idling of the first motor 12 and the second motor 31, and has a simple structure, few parts, and high overall system efficiency.

[0087] VI. In the engine-generated front-drive mode, the engine 11 drives the first wheel set 100 to rotate, which enables the first motor 12 and the second motor 31 to generate electricity simultaneously, thereby improving the kinetic energy recovery power and reducing the energy loss caused by mechanical braking in the prior art, while improving the electric braking safety on roads with poor adhesion.

[0088] 7. It can adjust both the speed and torque of engine 11 across the entire speed range. This improves the driving efficiency of engine 11, thereby improving the driving efficiency of the multi-mode hybrid drive system.

[0089] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A control method for a multi-mode hybrid drive system, used to implement the multi-mode hybrid drive system, the multi-mode hybrid drive system including a first drive mechanism (1), a power battery (2), and a second drive mechanism (3); The first drive mechanism (1) includes an engine (11), a first motor (12), and a planetary gear train assembly (13). The engine (11) is connected to the first transmission end of the planetary gear train assembly (13). The engine (11) can drive the first transmission end to rotate unidirectionally around its own central axis. The first motor (12) is fixedly connected to the second transmission end of the planetary gear train assembly (13). The output end of the planetary gear train assembly (13) can be connected to or separated from the first wheel set (100) of the vehicle body, and the output end of the planetary gear train assembly (13) can be connected to or separated from the frame (300) of the vehicle body. The second drive mechanism (3) includes a second motor (31), which can be connected to or separated from the second wheel set (200) of the vehicle body. The first wheel set (100) and the second wheel set (200) are distributed at intervals along the length direction of the vehicle body. The power battery (2) can be selectively electrically connected to the first motor (12) and the second motor (31), and the first motor (12) can be selectively electrically connected to the second motor (31); Its features are, The control method for the multi-mode hybrid drive system includes: Parking power generation: Control the output end of the planetary gear system assembly (13) to separate from the first wheel set (100); control the output end of the planetary gear system assembly (13) to connect to the frame (300); the engine (11) drives the planetary gear system assembly (13) so that the first motor (12) generates electricity and stores it in the power battery (2); Pure electric front drive: The output end of the planetary gear system assembly (13) is connected to the first wheel set (100); the output end of the planetary gear system assembly (13) is separated from the frame (300); the second motor (31) is separated from the second wheel set (200); the power battery (2) provides electrical energy to the first motor (12) to drive the planetary gear system assembly (13); Pure electric rear-wheel drive; controlling the output end of the planetary gear system assembly (13) to separate from the first wheel set (100); controlling the output end of the planetary gear system assembly (13) to connect or disconnect from the frame (300); controlling the second motor (31) to connect to the second wheel set (200); the power battery (2) provides electrical energy to the second motor (31) to drive the second wheel set (200); Pure electric four-wheel drive: The output end of the planetary gear system assembly (13) is connected to the first wheel set (100); the output end of the planetary gear system assembly (13) is separated from the frame (300); the second motor (31) is connected to the second wheel set (200); the power battery (2) provides electrical energy to the first motor (12) to drive the planetary gear system assembly (13); the power battery (2) also provides electrical energy to the second motor (31) to drive the second wheel set (200); Engine-driven power generation: The output end of the planetary gear system assembly (13) is connected to the first wheel set (100); the output end of the planetary gear system assembly (13) is disconnected from the frame (300); the second motor (31) is disconnected from the second wheel set (200); the engine (11) drives the planetary gear system assembly (13) to drive the first wheel set (100) and the first motor (12) generates electricity which is stored in the power battery (2); Engine direct drive - front drive: Control the output end of the planetary gear system assembly (13) to connect with the first wheel set (100); control the output end of the planetary gear system assembly (13) to separate from the frame (300); control the second motor (31) to separate from the second wheel set (200); the engine (11) drives the first transmission end of the planetary gear system assembly (13), and the power battery (2) provides electrical energy to the first motor (12) to drive the second transmission end of the planetary gear system assembly (13); Extended range generator rear drive: The output end of the planetary gear train assembly (13) is controlled to separate from the first wheel set (100); the output end of the planetary gear train assembly (13) is controlled to connect to the frame (300); the second motor (31) is controlled to connect to the second wheel set (200); the engine (11) drives the planetary gear train assembly (13), so that the first motor (12) generates electricity; the second motor (31) drives the second wheel set (200); Engine direct drive power generation - four-wheel drive: The output end of the planetary gear train assembly (13) is connected to the first wheel set (100); the output end of the planetary gear train assembly (13) is separated from the frame (300); the second motor (31) is connected to the second wheel set (200); the engine (11) drives the planetary gear train assembly (13) to drive the first wheel set (100) and the first motor (12) generates electricity; the second motor (31) drives the second wheel set (200); Engine direct drive - four-wheel drive: Control the output end of the planetary gear system assembly (13) to connect with the first wheel set (100); control the output end of the planetary gear system assembly (13) to separate from the frame (300); control the second motor (31) to connect with the second wheel set (200); the engine (11) drives the first transmission end of the planetary gear system assembly (13), and the power battery (2) provides electrical energy to the first motor (12) to drive the second transmission end of the planetary gear system assembly (13); the power battery (2) also provides electrical energy to the second motor (31) to drive the second wheel set (200); Braking power generation: Control the output end of the planetary gear system assembly (13) to connect with the first wheel set (100); control the output end of the planetary gear system assembly (13) to separate from the frame (300); control the second motor (31) to connect with the second wheel set (200); the vehicle's motion inertia drives the planetary gear system assembly (13) to move, driving the first motor (12) to generate electricity and store it in the power battery (2), and simultaneously driving the second motor (31) to generate electricity and store it in the power battery (2).

2. The control method for the multi-mode hybrid drive system according to claim 1, characterized in that, The planetary gear train assembly (13) includes a planet carrier (131), planetary gears (132) fixedly mounted on the planet carrier (131), a sun gear (133) meshing with the planetary gears (132), and a ring gear (134) meshing with the planetary gears (132). The engine (11) is connected to the planet carrier (131) and can drive the planet carrier (131) to rotate unidirectionally around its own central axis. The first motor (12) is fixedly connected to the sun gear (133). The first drive mechanism (1) further includes a transmission gear train (14) meshing with the gear ring (134), the output end of the transmission gear train (14) can be connected or separated from the first wheel set (100), and the output end of the transmission gear train (14) can be connected or separated from the frame (300).

3. The control method for a multi-mode hybrid drive system according to claim 2, characterized in that, The first drive mechanism (1) further includes a one-way clutch (15), the input end of which is connected to the output end of the engine (11), and the output end of which is connected to the planetary carrier (131).

4. The control method for a multi-mode hybrid drive system according to claim 2, characterized in that, The first drive mechanism (1) further includes a first connection separation structure (16) and a second connection separation structure (17). The first connection separation structure (16) is used to connect the output end of the transmission wheel system (14) to the first wheel set (100), and the second connection separation structure (17) is used to connect the output end of the transmission wheel system (14) to the frame (300).

5. The control method for a multi-mode hybrid drive system according to claim 4, characterized in that, The first connection separation structure (16) is a clutch; the second connection separation structure (17) is a clutch.

6. The control method for a multi-mode hybrid drive system according to any one of claims 1-5, characterized in that, The second drive mechanism (3) further includes a third connection and separation structure (32) for connecting the second motor (31) and the second wheel set (200).

7. The control method for a multi-mode hybrid drive system according to any one of claims 1-5, characterized in that, The first drive mechanism (1), the power battery (2) and the second drive mechanism (3) are distributed at intervals along the length of the vehicle body.

8. The control method for a multi-mode hybrid drive system according to claim 1, characterized in that, In the extended-range generator rear-wheel drive and the engine direct-drive generator-four-wheel drive, the following steps are further included between the first motor (12) generating electricity and the second motor (31) driving the second wheel set (200): The first motor (12) is electrically connected to the second motor (31), and the first motor (12) supplies power to the second motor (31).

9. The control method for a multi-mode hybrid drive system according to claim 1, characterized in that, The power of the first motor (12) is less than that of the second motor (31).

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