Vehicle drive system, method, and vehicle

Abstract

The application relates to a vehicle driving system, a method and a vehicle, and relates to the technical field of vehicles.The vehicle driving system comprises a shell, a double-rotor motor comprising an inner rotor and an outer rotor, a first planetary gear train comprising a first sun gear fixedly connected with the inner rotor, a first planetary gear assembly fixedly connected with the outer rotor and in transmission connection with the first sun gear, a first ring gear in transmission connection with the first planetary gear assembly, and a second ring gear fixedly connected with the shell, a second planetary gear train comprising a second sun gear fixedly connected with the first planetary gear assembly and in transmission connection with a second planetary gear assembly, the second planetary gear assembly in transmission connection with the second sun gear, and a third ring gear in transmission connection with the second planetary gear assembly, an output shaft fixedly connected with the second planetary gear assembly, and a gear shifting element, a first connecting part of which is fixedly connected with the first ring gear, and a second connecting part of which is in transmission connection with the second ring gear or the second planetary gear assembly.The vehicle driving system, the method and the vehicle meet the requirements of simple structure and smooth gear shifting.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a vehicle drive system, method, and vehicle. Background Technology

[0002] To balance the high torque required for low-speed heavy-load starts and the high efficiency required for high-speed cruising, a vehicle's drive system typically needs to be equipped with multiple gears.

[0003] In related technologies, there are generally two common solutions for achieving multiple gears. One common solution is to use a single motor paired with a multi-speed transmission, using multiple shifting elements (such as multiple clutches) for gear shifting. This solution not only requires a large number of shifting elements, resulting in a complex system structure and large space occupation, but also requires temporarily disconnecting the power transmission path during gear shifting, causing an interruption in output torque and affecting driving smoothness. The other common solution uses multiple motors in conjunction with a multi-speed gear mechanism. This solution still requires multiple shifting elements, resulting in a complex system structure, large space occupation, and difficulty in achieving a compact arrangement within a limited space.

[0004] Therefore, how to balance the need for a simple drive system structure, adapt to the requirements of integrated and compact layout, and achieve smooth gear shifting has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the aforementioned technical problems, embodiments of this application provide a vehicle drive system, method, and vehicle that can balance the need for a simple vehicle drive system structure, adaptability to integrated and compact layout, and the need for smooth gear shifting.

[0006] In a first aspect, a vehicle drive system is provided, comprising: case; A dual-rotor motor, comprising an inner rotor and an outer rotor arranged coaxially and nested; The first planetary gear set includes a first sun gear, a first planetary assembly, a first gear ring, and a second gear ring. The first sun gear is fixedly connected to the inner rotor, the first planetary assembly is fixedly connected to the outer rotor, the first planetary assembly is driven by the first sun gear, the inner side of the first gear ring is driven by the first planetary assembly, and the second gear ring is fixedly connected to the housing. The second planetary gear set includes a second sun gear, a second planetary assembly, and a third ring gear. The second sun gear is fixedly connected to the first planetary assembly, and the second planetary assembly is drivenly connected to the second sun gear. The inner side of the third ring gear is drivenly connected to the second planetary assembly, and the third ring gear is fixedly connected to the housing. The output shaft is fixedly connected to the second planetary assembly; The shifting element includes a first connecting part and a second connecting part, wherein the first connecting part is fixedly connected to the first gear ring; The controller is used to adjust the working state of the inner rotor and the outer rotor, and to control the second connecting part to be selectively driven to the inside of the second gear ring or the second planetary assembly.

[0007] According to a first aspect of this application, the shifting element is configured as a synchronizer.

[0008] According to a first aspect of this application, the inner rotor, the outer rotor, the first sun gear, the second sun gear, and the output shaft are coaxially arranged.

[0009] According to a first aspect of this application, the first planetary component includes: The first planetary carrier is fixedly connected to the outer rotor; wherein the second sun gear is fixedly connected to the first planetary carrier; The first planetary gear is located inside the first planet carrier and is connected to the first sun gear via a transmission. The second planetary gear is located on the outside of the first planetary carrier, and the second planetary gear is connected to the inside of the first gear ring for transmission.

[0010] According to a first aspect of this application, the vehicle drive system further includes: A parking mechanism is disposed within the housing and is connected to the first planetary carrier for locking the first planetary carrier.

[0011] According to a first aspect of this application, the second planetary component includes: The second planetary carrier is fixedly connected to the output shaft; The third planetary gear is located inside the second planetary carrier, and the third planetary gear is connected to the second sun gear via a transmission. The fourth planetary gear is located on the outside of the second planetary carrier, and the fourth planetary gear is connected to the inside of the third gear ring for transmission. The fifth planetary gear is mounted on the second planetary carrier and is used for transmission connection to the second connecting part.

[0012] According to a first aspect of this application, the vehicle drive system further includes: An oil pump is located inside the housing and is connected to the first planetary gear set, the second planetary gear set, and the shifting element via pipelines.

[0013] Secondly, a vehicle is also provided, comprising: Vehicle body; wheel; As described in the previous embodiment, in the vehicle drive system, the housing is fixedly connected to the vehicle body, and the output shaft is fixedly connected to the wheel.

[0014] Thirdly, a vehicle driving method is also provided, applied to the controller in the vehicle driving system as described in the previous embodiment; The vehicle driving method includes: Receive shift command; Adjust the working state of the inner rotor according to the shift command; and / or, Adjust the working state of the outer rotor according to the shift command; and / or, According to the shift command, the second connecting part is controlled to be connected to the inner side of the second gear ring or the second planetary assembly.

[0015] According to a third aspect of this application, controlling the second connecting portion to be drive-connected to the inner side of the second gear ring or the second planetary assembly according to the shift command includes: Control the separation of the second connecting part from the second planetary assembly; When the speed difference between the second connecting part and the second gear ring is less than or equal to the first preset speed threshold, the inner transmission connection between the second connecting part and the second gear ring is controlled.

[0016] According to a third aspect of this application, controlling the second connecting portion to be drive-connected to the inner side of the second gear ring or the second planetary assembly according to the shift command includes: Control the separation of the second connecting part from the inner side of the second gear ring; When the speed difference between the second connecting part and the second planetary assembly is less than or equal to the second preset speed threshold, the second connecting part is controlled to be connected to the second planetary assembly in a transmission manner.

[0017] The vehicle drive system, method, and vehicle provided in this application embodiment utilize a dual-rotor motor with an inner and outer rotor coaxially nested. The inner and outer rotors are connected to different components of the first and second planetary gear sets, respectively. Simultaneously, only a single shifting element selectively drives the first and second planetary gear sets. Leveraging the independent speed and torque control of the inner and outer rotors of the dual-rotor motor, during gear shifting, one rotor continues to output power to the wheels, while the other rotor, by adjusting its speed, assists the shifting element in moving to different working positions, thus achieving the gear shifting operation. In this way, by using a single shifting element for gear shifting, the structure of the vehicle drive system is simplified, facilitating a more integrated and compact layout. Furthermore, it ensures uninterrupted power transmission during gear shifting, achieving a smooth shifting effect. Attached Figure Description

[0018] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0019] Figure 1 This is a schematic diagram of the structure of a vehicle drive system provided for an exemplary embodiment of this application.

[0020] Figure 2 This is a schematic flowchart of a vehicle driving method provided as an exemplary embodiment of this application.

[0021] Figure 3 This is a schematic diagram illustrating a process for controlling the second connecting part to be connected to the inner side of the second gear ring or the second planetary assembly according to a shift command, as provided in an exemplary embodiment of this application.

[0022] Figure 4 This is a schematic diagram illustrating a process for controlling the second connecting part to be connected to the inner side of the second gear ring or the second planetary assembly according to a shift command, as provided in another exemplary embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the controller provided as an exemplary embodiment of this application.

[0024] Reference numerals: 100-Vehicle drive system; 110-Housing; 120-Dual rotor motor; 121-Inner rotor; 122-Outer rotor; 123-Stator; 130-First planetary gear set; 131-First sun gear; 132-First planetary assembly; 1321-First planetary carrier; 1322-First planetary gear; 1323-Second planetary gear; 133-First ring gear; 134-Second ring gear; 140-Second planetary gear set; 141-Second sun gear; 142-Second planetary assembly; 1421-Second planetary carrier; 1422-Third planetary gear; 1423-Fourth planetary gear; 1424-Fifth planetary gear; 143-Third ring gear; 150-Output shaft; 160-Shift element; 161-First connecting part; 162-Second connecting part; 170-Parking mechanism; 180-Oil pump; 210-Wheel; 220-Controller. Detailed Implementation

[0025] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0026] For vehicle drive systems, to balance the high torque required for low-speed heavy-load starts and the high efficiency required for high-speed cruising, multiple gears are typically required. In related technologies, two common solutions are used to achieve multiple gears. One common solution is to use a single motor paired with a multi-speed transmission, using multiple shifting elements (such as multiple clutches) for gear shifting. However, this solution not only requires a large number of shifting elements, resulting in a complex system structure and large space occupation, but also requires temporarily disconnecting the power transmission path during gear shifts, causing an interruption in output torque and affecting driving smoothness. The other common solution uses multiple motors with a multi-speed gear mechanism, but it still requires multiple shifting elements, similarly facing the problems of complex structure and large space occupation, making it unsuitable for integrated and compact layout.

[0027] After in-depth analysis, the inventors discovered that the root cause of the above problems lies in the fact that the relevant technical solutions couple the gear shifting function and the power transmission function into the same set of mechanical actions. Each gear shift requires first cutting off the power transmission path between the power source and the wheels, and then re-establishing the connection, which inevitably causes power interruption. In order to achieve multiple gears, multiple clutches must be added, resulting in a more complex drive structure and a larger space occupation.

[0028] To overcome the aforementioned contradictions, this application proposes a different technical approach. The core concept of this application lies in: setting up a dual-rotor motor with an inner and outer rotor coaxially nested, allowing the inner and outer rotors to be connected to different components of the first and second planetary gear sets respectively. Simultaneously, using only a single shifting element, the first and second planetary gear sets are selectively driven. Leveraging the independent speed and torque control of the inner and outer rotors of the dual-rotor motor, during gear shifting, one rotor continues to output power to the wheels, while the other rotor, by adjusting its speed, assists the shifting element in moving to different working positions, thus achieving the gear shifting operation. In this way, by using a single shifting element to achieve gear shifting, not only can the structure of the vehicle drive system be simplified, facilitating a more integrated and compact layout, but it also ensures uninterrupted power during gear shifting, achieving a smooth shifting effect.

[0029] The vehicle drive system, method, and vehicle provided in the embodiments of this application will be described in detail below.

[0030] Figure 1 This is a schematic diagram of the structure of a vehicle drive system provided for an exemplary embodiment of this application. Figure 1 As shown, this application embodiment provides a vehicle, which may include a vehicle body, wheels 210 and a vehicle drive system 100. The vehicle drive system 100 is disposed on the vehicle body and can be used to drive the wheels 210 to rotate.

[0031] like Figure 1 As shown, the vehicle drive system 100 provided in this application embodiment may include a housing 110, a dual-rotor motor 120, a first planetary gear set 130, a second planetary gear set 140, an output shaft 150, a shifting element 160, and a controller 220. Figure 5 (As shown in the image).

[0032] It should be noted that the housing 110 is fixedly connected to the vehicle body and is stationary relative to the vehicle body. The housing 110 can serve as a stationary load-bearing structure to provide support and protection for other components of the vehicle drive system 100.

[0033] like Figure 1 As shown, the dual-rotor motor 120 includes an inner rotor 121 and an outer rotor 122, which are coaxially nested. The inner rotor 121 and the outer rotor 122 can rotate independently, and their speed and torque can be adjusted independently. The "coaxial nesting" mentioned above can be understood as the outer rotor 122 having a hollow structure, with the inner rotor 121 housed inside the outer rotor 122, and their rotation axes coinciding.

[0034] In practical applications, such as Figure 1 As shown, the dual-rotor motor 120 may also include a stator 123, which is arranged outside the outer rotor 122. The specific arrangement structure is described in the relevant technology and will not be repeated here.

[0035] like Figure 1 As shown, the first planetary gear 130 may include a first sun gear 131, a first planetary assembly 132, a first gear ring 133, and a second gear ring 134.

[0036] It should be noted that the first sun gear 131 is fixedly connected to the inner rotor 121. For example, a relatively fixed connection is achieved through splines or interference fits, so that the power of the inner rotor 121 can be directly transmitted to the first sun gear 131.

[0037] It should be noted that the first planetary assembly 132 is fixedly connected to the outer rotor 122, and the first planetary assembly 132 is also connected to the first sun gear 131 via a transmission connection. The power of the outer rotor 122 can be directly transmitted to the first planetary assembly 132, while the power of the inner rotor 121 can be transmitted to the first planetary assembly 132 via the first sun gear 131.

[0038] It should be noted that the inner side of the first gear ring 133 is connected to the first planetary assembly 132 for transmission, and the first planetary assembly 132 can drive the first gear ring 133 to rotate. The second gear ring 134 is fixedly connected to the housing 110.

[0039] It should be noted that the first gear ring 133 and the second gear ring 134 can be two independent gear rings, or they can be integrated into the teeth of different areas of the same annular component.

[0040] In one embodiment, the first gear ring 133 is a rotatable annular inner gear ring, while the second gear ring 134 is an annular gear ring fixed to the housing 110. The first gear ring 133 is located inside the second gear ring 134, and the two are coaxially arranged.

[0041] like Figure 1 As shown, the second planetary array 140 may include a second sun gear 141, a second planetary assembly 142, and a third gear ring 143.

[0042] It should be noted that the second sun gear 141 is fixedly connected to the first planetary assembly 132, and the outer rotor 122 and / or the inner rotor 121 can transmit power to the second sun gear 141 through the first planetary assembly 132.

[0043] It should be noted that the second planetary assembly 142 is connected to the second sun gear 141 via a transmission connection, and the second sun gear 141 can transmit the received power to the second planetary assembly 142. The inner side of the third ring gear 143 is connected to the second planetary assembly 142 via a transmission connection, and the third ring gear 143 is fixedly connected to the housing 110. Because the third ring gear 143 is fixed, the output speed of the second planetary assembly 142 is lower than the input speed of the second sun gear 141, achieving the effect of speed reduction and torque increase.

[0044] like Figure 1 As shown, the output shaft 150 is fixedly connected to the second planetary assembly 142, and the output shaft 150 is also fixedly connected to the wheel 210 mentioned above. The output shaft 150 receives the power transmitted by the second planetary assembly 142 and outputs it to the wheel 210, causing the wheel 210 to rotate.

[0045] like Figure 1 As shown, the shifting element 160 may include a first connecting portion 161 and a second connecting portion 162. The first connecting portion 161 is fixedly connected to the first gear ring 133, so that the first connecting portion 161 can rotate with the first gear ring 133. The second connecting portion 162 can be selectively connected to the inner side of the second gear ring 134 or the second planetary assembly 142 under the control of the controller 220.

[0046] Specifically, when the second connecting part 162 is connected to the inner side of the second ring gear 134, the power of the inner rotor 121 and / or the outer rotor 122 is transmitted to the second planetary gear 140 through the first planetary gear set 130. When the second connecting part 162 is connected to the second planetary assembly 142, the second planetary assembly 142 transmits power to the first ring gear 133 through the shifting element 160. The first ring gear 133 rotates synchronously with the second planetary assembly 142, changing the power transmission path. Therefore, by connecting the second connecting part 162 to the inner side of the second ring gear 134 or the second planetary assembly 142, different transmission ratios can be formed, realizing gear shifting.

[0047] It should be noted that the gear shifting operation can be completed using only one shifting element 160 in the vehicle drive system 100, avoiding the use of multiple clutches, simplifying the overall structure of the vehicle drive system 100, and helping the vehicle drive system 100 to achieve an integrated and compact layout.

[0048] It should be noted that the controller 220 is used to adjust the working state of the inner rotor 121 and the outer rotor 122, and to control the second connecting part 162 to selectively drive and connect to the inner side of the second gear ring 134 or the second planetary assembly 142. Through this control, the inner rotor 121 and the outer rotor 122 can work independently, achieving the effect of one rotor maintaining output torque and the other rotor actively adjusting its speed during gear shifting to synchronize the speed of the shifting element 160 with the target connecting part (the second gear ring 134 or the second planetary assembly 142). Specifically, the aforementioned dual-rotor motor 120 works in conjunction with the first planetary gear set 130, the second planetary gear set 140, and the shifting element 160. During shifting, when the second connecting part 162 separates from the inner side of the second ring gear 134 (or the second planetary assembly 142), the controller 220 can adjust the speed of the inner rotor 121 to change the speed of the first ring gear 133 and the shifting element 160, so that the second connecting part 162 matches the speed of the second planetary assembly 142 (or the second ring gear 134). Simultaneously, the outer rotor 122 continues to transmit torque to the output shaft 150 through the path of the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142, thereby maintaining the continuity of vehicle driving force. Once the speeds of the second connecting part 162 and the second planetary assembly 142 (or the second ring gear 134) are synchronized, the second connecting part 162 is then engaged with the second planetary assembly 142 (or the second ring gear 134) to achieve a transmission connection. Therefore, the driving torque is continuously transmitted to the output shaft 150 throughout the entire gear shifting process, achieving a smooth gear shifting effect with uninterrupted output torque, which significantly improves the vehicle's driving smoothness.

[0049] Based on the above structure, the vehicle drive system 100, under the coordination of the controller 220, can realize multiple operating modes. These modes include high-torque driving mode, normal driving mode, reverse mode, and energy recovery mode. The core of realizing these operating modes lies in the fact that the second connecting part 162 of the shift element 160 is connected to the inner side of the second gear ring 134 (see reference). Figure 1 The second connecting portion 162 of the shift element 160 moves to the left-hand connection state) or the second planetary assembly 142 (refer to) Figure 1 When the second connecting part 162 of the shifting element 160 moves to the right-hand connection state, combined with the independent control of the inner rotor 121 and the outer rotor 122 in the dual-rotor motor 120, different power transmission paths can be formed. The various operating modes are described in detail below.

[0050] When the second connecting portion 162 of the shift element 160 is in the left-side connected state, the second connecting portion 162 of the shift element 160 is drivenly connected to the inner side of the second gear ring 134, thus forming a first independent reduction system. The operating modes in this state include at least the following: In the first gear S1 of the high-torque driving mode: the controller 220 controls the outer rotor 122 and the inner rotor 121 to output torque in the same direction, and the second connecting part 162 of the shift element 160 is connected to the inner side of the second gear ring 134. The torque of the outer rotor 122 is transmitted to the output shaft 150 sequentially through the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142; the torque of the inner rotor 121 is transmitted to the output shaft 150 sequentially through the first sun gear 131, the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142. The torques of the inner rotor 121 and the outer rotor 122 converge in the second planetary assembly 142 to obtain the maximum transmission ratio (e.g., 21:1), providing strong torque output for the vehicle in scenarios such as low-speed start-up and heavy-load hill climbing.

[0051] The first gear of the energy recovery mode, T1: In S1 mode, when braking or coasting is required for energy recovery, the controller 220 can switch the outer rotor 122 and the inner rotor 121 to the power generation mode (the inner rotor 121 and the outer rotor 122 are rotated by the inertia of the wheel 210). Through the same power transmission path, the kinetic energy of the wheel 210 can be recharged to the energy storage device.

[0052] In the first gear (D1) of the normal driving mode: the controller 220 issues a control command, and only the outer rotor 122 operates, while the inner rotor 121 is in an idling or stopped state. The second connecting part 162 of the shift element 160 remains in the left-hand connected state. The torque of the outer rotor 122 is transmitted sequentially to the output shaft 150 through the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142, achieving a moderate gear ratio (e.g., approximately 17.5:1), suitable for normal driving conditions on urban roads, balancing power and driving efficiency.

[0053] In the third gear (D3) of the normal driving mode: the controller 220 issues a control command, and only the inner rotor 121 operates, while the outer rotor 122 is in an idling or stopped state, and the second connecting part 162 of the shift element 160 remains in the left position. The torque of the inner rotor 121 is transmitted to the output shaft 150 sequentially through the first sun gear 131, the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142, which can achieve a smaller transmission ratio (e.g., about 3.5:1), suitable for high-speed cruising conditions, and reduces the energy consumption of the dual rotor motor 120.

[0054] The third gear of the energy recovery mode, T3: In this D3 mode, when braking or coasting is required for energy recovery, the controller 220 can switch the inner rotor 121 to the power generation mode (the inner rotor 121 is driven by the inertia of the wheel 210). Through the same power transmission path, the kinetic energy of the wheel 210 can be recharged to the energy storage device.

[0055] When the second connecting portion 162 of the shift element 160 switches from the left-side connection state to the right-side left-side connection state, that is, when the second connecting portion 162 of the shift element 160 is connected to the second planetary assembly 142, a second independent reduction system can be formed. The operating modes in this state include at least the following: In the second gear S2 of the high-torque driving mode: the controller 220 controls the outer rotor 122 and the inner rotor 121 to output torque in the same direction. The second connecting part 162 of the shift element 160 is connected to the second planetary assembly 142. The torque of the outer rotor 122 is transmitted to the output shaft 150 sequentially through the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142. The torque of the inner rotor 121 is transmitted to the first ring gear 133 through the first sun gear 131 and the first planetary assembly 132, and then transmitted to the second planetary assembly 142 through the first connecting part 161 and the second connecting part 162 of the shift element 160, which is fixed to the first ring gear 133. Finally, it is transmitted to the output shaft 150 through the second planetary assembly 142. The torques of the inner rotor 121 and the outer rotor 122 converge in the second planetary assembly 142, resulting in a transmission ratio between S1 and D1 (for example, approximately 17:1).

[0056] High torque recovery mode T2: In this S2 mode, when braking or coasting is required for energy recovery, the controller 220 can switch the outer rotor 122 and the inner rotor 121 to power generation mode. Through the same power transmission path, the kinetic energy of the wheel 210 can be recharged to the energy storage device.

[0057] In the second gear (D2) of the normal driving mode: the controller 220 issues a control command, and only the outer rotor 122 operates, while the inner rotor 121 is in an idling or stopped state. The second connecting part 162 of the shift element 160 remains in the right-hand connected state. A portion of the torque from the outer rotor 122 is transmitted sequentially to the output shaft 150 via the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142. Another portion of the torque is transmitted sequentially via the first planetary assembly 132, the first ring gear 133, and then via the first connecting part 161 and the second connecting part 162 of the shift element 160, which is fixed to the first ring gear 133, to the second planetary assembly 142, and then to the output shaft 150 from the second planetary assembly 142. The two portions of torque act in opposite directions on the second planetary assembly 142, and when combined, a gear ratio between D1 and D3 (e.g., approximately 13.5:1) can be obtained, suitable for medium- and high-speed driving conditions.

[0058] It should be noted that by forming the aforementioned two independent deceleration systems—namely, the S1-D1-D3-T1-T3 deceleration system in the left-hand connection state and the S2-D2-T2 deceleration system in the right-hand connection state—full coverage of gear positions under all operating conditions can be achieved. Furthermore, if a component in one of the deceleration systems fails, the other deceleration system can still maintain the vehicle's basic driving capability, thus improving the reliability and safety of the vehicle during operation.

[0059] It should be noted that when switching between the two independent deceleration systems is required, i.e., when switching the connection state of the second connecting part 162 of the shift element 160 is required, the vehicle drive system 100 can achieve a smooth shifting effect without power interruption.

[0060] For example, in one embodiment, the vehicle switches from the D2 gear in normal driving mode (with the second connecting part 162 in the right-hand connection state) to the S1 gear in high-torque driving mode (with the second connecting part 162 in the left-hand connection state). First, the controller 220 receives a shift command. The controller 220 maintains the torque output state of the outer rotor 122 unchanged, ensuring that the outer rotor 122 continuously transmits power to the output shaft 150 through the path of the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142, ensuring uninterrupted driving force. Simultaneously, the controller 220 controls the second connecting part 162 of the shift element 160 to separate from the second planetary assembly 142, releasing the load on the inner rotor 121 and allowing it to enter a free state. By controlling the rotational speed of the inner rotor 121, the rotational speed of the first ring gear 133 is adjusted, thereby adjusting the rotational speed of the second connecting part 162 of the shift element 160. When the speed difference between the second connecting part 162 and the second gear ring 134 of the shift element 160 is detected to be less than the first preset speed threshold, the controller 220 controls the inner side of the second connecting part 162 to engage with the inner side of the second gear ring 134. The controller 220 then calculates the target speed of the first sun gear 131 based on the current vehicle speed and the speed ratio of the target gear S1, and controls the inner rotor 121 to quickly adjust to that speed. At this point, the power transmission path smoothly switches to the S1 mode. Throughout the shifting process, the driving torque of the wheel 210 is continuously provided by the outer rotor 122, achieving smooth shifting without power interruption.

[0061] For example, when shifting from gear D1 (second connecting part 162 is in the left-hand connection state) to gear D2 (second connecting part 162 is in the right-hand connection state), the controller 220 controls the second connecting part 162 of the shift element 160 to separate from the second gear ring 134, releasing the load on the inner rotor 121 and allowing it to enter a free state. By controlling the rotational speed of the inner rotor 121, the rotational speed of the first gear ring 133 is adjusted, thereby adjusting the rotational speed of the second connecting part 162 of the shift element 160. When the rotational speed difference between the second connecting part 162 of the shift element 160 and the second planetary assembly 142 is detected to be less than a second preset speed threshold, the controller 220 controls the second connecting part 162 to smoothly engage with the second planetary assembly 142. After the shift element 160 has completed its adjustment, the rotation of the inner rotor 121 is stopped. This achieves the shift from gear D1 to gear D2. Throughout the shifting process, the driving torque of the wheel 210 is continuously provided by the outer rotor 122, achieving a smooth shifting without power interruption.

[0062] It should be noted that the reverse gear mode mentioned above can include two gear modes: High-torque reverse gear R1: Controller 220 controls the outer rotor 122 and inner rotor 121 to work simultaneously, with the output torque direction opposite to that of gear S1. The second connecting part 162 of the shift element 160 remains in the left-hand connection state. The torque of the outer rotor 122 is transmitted sequentially to the output shaft 150 via the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142; the torque of the inner rotor 121 is transmitted sequentially to the output shaft 150 via the first sun gear 131, the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142. The torques of the inner rotor 121 and the outer rotor 122 converge at the second planetary assembly 142, achieving the maximum transmission ratio (e.g., -21:1), providing strong torque output for low-speed starts and heavy-load hill climbing.

[0063] In the normal torque reverse gear R2: the controller 220 issues a control command, and only the outer rotor 122 operates. Its output torque direction is opposite to that of gear D1. The inner rotor 121 is in an idling or stopped state, and the second connecting part 162 of the shift element 160 remains in the left-hand connected state. The torque of the outer rotor 122 is transmitted sequentially to the output shaft 150 via the first planetary assembly 132, the second sun gear 141, and the second planetary assembly 142, achieving a moderate gear ratio (e.g., approximately -17.5:1), suitable for normal driving conditions such as urban roads.

[0064] In one embodiment, the shifting element 160 is configured as a synchronizer. The relevant structure of the synchronizer has been described in related art and will not be repeated here. Using a synchronizer, the friction cone surface can actively reduce the speed difference between the first gear ring 133 (first connecting part 161) and the target connecting end (second gear ring 134 or second planetary assembly 142) before engagement, thereby effectively reducing the impact load and noise at the moment of engagement, avoiding tooth surface damage, and significantly improving shifting smoothness and the durability of each component.

[0065] In one embodiment, the shift element 160 may also employ other devices, such as a wet clutch, a dry clutch, or a jaw clutch, as long as it can selectively engage the target connection end (the second gear ring 134 or the second planetary assembly 142).

[0066] like Figure 1 As shown, the inner rotor 121, outer rotor 122, first sun gear 131, second sun gear 141, and output shaft 150 are coaxially arranged, meaning that the rotation axes of the aforementioned parts are collinear. This coaxial arrangement eliminates the need for an intermediate drive shaft, significantly shortens the axial dimension of the entire vehicle drive system 100, and makes the overall structure more compact, which helps to achieve an integrated and compact layout of the vehicle drive system 100.

[0067] like Figure 1As shown, the first planetary assembly 132 may include a first planet carrier 1321, a first planet gear 1322, and a second planet gear 1323. The first planet carrier 1321 is fixedly connected to the outer rotor 122, and the second sun gear 141 is also fixedly connected to the first planet carrier 1321. The first planet gear 1322 is located on the inner side of the first planet carrier 1321 and is drivenly connected to the first sun gear 131; the second planet gear 1323 is located on the outer side of the first planet carrier 1321 and is drivenly connected to the inner side of the first gear ring 133. In this way, by utilizing the space on both the inner and outer sides of the first planetary carrier 1321 to install the first planetary gear 1322 and the second planetary gear 1323, space can be saved and the first planetary assembly 132 can be compactly designed. On the other hand, the transmission path between the first sun gear 131 and the first ring gear 133 is split into two independent meshing pairs. During the design, the ratio of the first planetary gear 1322 to the first sun gear 131 and the ratio of the second planetary gear 1323 to the first ring gear 133 can be selected independently, thereby obtaining a wider transmission ratio coverage range and effectively improving the adaptability of the vehicle drive system 100 to different working conditions.

[0068] like Figure 1 As shown, the vehicle drive system 100 may further include a parking mechanism 170, which is disposed within the housing 110 and connected to the first planetary carrier 1321 for locking the first planetary carrier 1321. During the locking process, the parking mechanism 170 can gradually reduce the rotational speed of the first planetary carrier 1321, thereby reducing the rotational speed of the output shaft 150, until the output shaft 150 is locked.

[0069] It should be understood that, compared to directly locking the output shaft 150, the parking mechanism 170 acts on the first planetary carrier 1321, which has a higher rotational speed and lower torque in the transmission path. The required locking torque is greatly reduced. In other words, the parking mechanism 170 can generate a sufficiently large parking braking torque on the wheel 210 by applying a small locking torque on the first planetary carrier 1321, effectively improving parking reliability and safety.

[0070] In one embodiment, the parking mechanism 170 may include a ratchet and a pawl. The ratchet is fixed on the first planetary carrier 1321, and the pawl is mounted on the housing 110. When the pawl engages with the tooth groove of the ratchet, the first planetary carrier 1321 is locked, thereby locking the output shaft 150 and achieving reliable parking.

[0071] In one embodiment, the parking mechanism 170 may also be equipped with a locking device such as a band brake or a disc brake.

[0072] like Figure 1As shown, the second planetary assembly 142 may include a second planet carrier 1421, a third planetary gear 1422, a fourth planetary gear 1423, and a fifth planetary gear 1424. The second planetary carrier 1421 is fixedly connected to the output shaft 150; the third planetary gear 1422 is located inside the second planetary carrier 1421 and is drivenly connected to the second sun gear 141; the fourth planetary gear 1423 is located outside the second planetary carrier 1421 and is drivenly connected to the inner side of the third ring gear 143; the fifth planetary gear 1424 is located on the second planetary carrier 1421 and is used for drivingly connecting the second connecting part 162. Here, the second connecting part 162 may be provided with teeth that mesh with the fifth planetary gear 1424. When the second connecting part 162 moves to the right and engages with the fifth planetary gear 1424...

[0073] It should be understood that by integrating the third planetary gear 1422, the fourth planetary gear 1423, and the fifth planetary gear 1424 at different positions on the second planetary carrier 1421, space can be saved, achieving a compact design for the second planetary assembly 142. On the other hand, when the second connecting part 162 moves to the right and engages with the fifth planetary gear 1424, the power of the first ring gear 133 is transmitted to the second planetary carrier 1421 through the fifth planetary gear 1424, and merges with the power transmitted through the second sun gear 141, the third planetary gear 1422, and the fourth planetary gear 1423 on the second planetary carrier 1421. Thus, without adding an additional intermediate shaft, the power of the two paths is merged, effectively simplifying the structure of the vehicle drive system 100 and improving the integration of the vehicle drive system 100.

[0074] like Figure 1 As shown, the vehicle drive system 100 may further include an oil pump 180, which is housed within the housing 110. The oil pump 180 is connected to the first planetary gear set 130, the second planetary gear set 140, and the shift element 160 via pipelines. The oil pump 180 can deliver lubricating oil or cooling oil to the gear meshing area, bearings, shift element 160, and other locations via pipelines, achieving active lubrication and cooling, effectively reducing the temperature rise and wear of various components during operation, and extending the service life of each component.

[0075] Figure 2 This is a schematic flowchart illustrating a vehicle driving method provided as an exemplary embodiment of this application. Figure 2 As shown, the vehicle driving method provided in this application embodiment can be applied to the controller 220 in the vehicle driving system 100 as described in the previous embodiment. Specifically, the vehicle driving method includes: S910: Receives shift commands.

[0076] Specifically, the shift command can be issued by the driver manually operating the gear selector, or it can be automatically generated by the vehicle control unit based on the driving status.

[0077] S920: Adjusts the working state of the inner rotor according to the shift command.

[0078] It should be noted that adjusting the working state of the inner rotor 121 can be understood as adjusting the speed of the inner rotor 121, controlling the inner rotor 121 to stop, controlling the inner rotor 121 to rotate forward or reverse, etc.

[0079] For example, if you need to switch from S1 to D1, you can adjust the working state of the inner rotor 121 from normal rotation to stop rotation to complete the gear switching.

[0080] In other words, in one embodiment, performing step S920 alone can achieve a smooth gear shifting effect.

[0081] S930: Adjusts the working state of the outer rotor according to the shift command.

[0082] It should be noted that adjusting the working state of the outer rotor 122 can be understood as adjusting the speed of the outer rotor 122, controlling the outer rotor 122 to stop, controlling the outer rotor 122 to rotate forward or reverse, etc.

[0083] For example, if you need to switch from D3 to S1 as mentioned above, you can adjust the working state of the outer rotor 122 from being stopped to rotating synchronously with the inner rotor 121 to complete the gear switching.

[0084] In other words, in one embodiment, performing step S930 alone can achieve a smooth gear shifting effect.

[0085] S940: According to the shift command, control the second connecting part to be connected to the inner side of the second gear ring or the second planetary assembly.

[0086] Specifically, referring to the process described above of switching from D2 gear (second connecting part 162 is in the right-hand connection state) to S1 gear (second connecting part 162 is in the left-hand connection state) in the high-torque driving mode, and switching from D1 gear (second connecting part 162 is in the left-hand connection state) to D2 gear (second connecting part 162 is in the right-hand connection state), during these gear shifting processes, one rotor continues to output power to the wheel 210, while the other rotor adjusts its speed to assist the shifting element 160 in moving to different working positions, thereby realizing the shifting operation and achieving a smooth shifting effect without power interruption.

[0087] The vehicle driving method provided in this application embodiment, on the one hand, only requires a single gear shifting element to achieve switching between different gears, avoiding the use of multiple clutches, simplifying the overall structure of the vehicle driving system 100, and helping the vehicle driving system 100 to achieve integrated and compact layout; on the other hand, by taking advantage of the characteristic that the inner rotor 121 and outer rotor 122 of the dual rotor motor 120 can independently control the speed and torque, during the gear shifting process, one rotor continues to output power to the wheel 210, while the other rotor, by adjusting its speed, assists the gear shifting element 160 to move to different working positions to achieve the gear shifting operation, ensuring that the power is not interrupted during the gear shifting process and achieving a smooth gear shifting effect.

[0088] Figure 3 This is a schematic diagram illustrating a process for controlling the second connecting part to be connected to the inner side of the second gear ring or the second planetary assembly according to a shift command, as provided in an exemplary embodiment of this application. Figure 3 As shown, step S940 may include: S941: Controls the separation of the second connecting part from the second planetary assembly.

[0089] S942: When the speed difference between the second connecting part and the second gear ring is less than or equal to the first preset speed threshold, control the inner transmission connection between the second connecting part and the second gear ring.

[0090] Specifically, referring to the previous description of switching from gear D2 (second connecting part 162 in right-hand connection state) to gear S1 (second connecting part 162 in left-hand connection state), after executing step S941, the inner rotor 121 enters a free state. By controlling the rotational speed of the inner rotor 121, the rotational speed of the first gear ring 133 can be adjusted, thereby adjusting the rotational speed of the second connecting part 162 of the shift element 160. When the rotational speed difference between the second connecting part 162 and the second gear ring 134 of the shift element 160 is less than a preset first preset speed threshold, step S942 is executed, controlling the inner side of the second connecting part 162 and the second gear ring 134 to engage, thus achieving transmission connection. In this way, the impact load generated when the inner side of the second connecting part 162 and the second gear ring 134 engages can be effectively reduced, avoiding tooth breakage on the inner side of the second connecting part 162 and the second gear ring 134, significantly improving shifting smoothness and the durability of each component.

[0091] Figure 4 This is a schematic diagram illustrating a process for controlling the second connecting part to be connected to the inner side of the second gear ring or the second planetary assembly according to a shift command, as provided in another exemplary embodiment of this application. Figure 4 As shown, step S940 may include: S943: Controls the separation of the second connecting part from the inside of the second gear ring.

[0092] S944: When the speed difference between the second connecting part and the second planetary assembly is less than or equal to the second preset speed threshold, control the second connecting part to be connected to the second planetary assembly via transmission.

[0093] Specifically, referring to the previous description of switching from gear D1 (second connecting part 162 in left-hand connection state) to gear D2 (second connecting part 162 in right-hand connection state), after executing step S943, the inner rotor 121 enters a free state. By controlling the rotational speed of the inner rotor 121, the rotational speed of the first gear ring 133 can be adjusted, thereby adjusting the rotational speed of the second connecting part 162 of the shift element 160. When the rotational speed difference between the second connecting part 162 and the second planetary assembly 142 of the shift element 160 is less than a preset second preset speed threshold, step S944 is executed, controlling the second connecting part 162 to engage with the second planetary assembly 142 to achieve transmission connection. In this way, the impact load generated when the second connecting part 162 engages with the second planetary assembly 142 can be effectively reduced, avoiding tooth breakage between the second connecting part 162 and the second planetary assembly 142, significantly improving shifting smoothness and the durability of each component.

[0094] In one embodiment, the first preset speed threshold and the second preset speed threshold may be the same or different.

[0095] Figure 5 This is a schematic diagram of the controller provided as an exemplary embodiment of this application. Figure 5 As shown, the controller 220 includes one or more processors 221 and memory 222.

[0096] The processor 221 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the controller 220 to perform desired functions.

[0097] The memory 222 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 221 may execute the program instructions to implement the control methods and / or other desired functions of the various embodiments of this application described above. Various contents such as input signals, signal components, and noise components may also be stored in the computer-readable storage medium.

[0098] In one example, controller 220 may also include input device 223 and output device 224, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).

[0099] When the controller is a standalone device, the input device 223 can be a communication network connector for receiving the acquired input signals from the first device and the second device.

[0100] In addition, the input device 223 may also include, for example, a keyboard, a mouse, etc.

[0101] The output device 224 can output various information to the outside, including determined distance information, direction information, etc. The output device 224 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0102] Of course, for the sake of simplicity, Figure 5 Only some of the components of the controller 220 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the controller 220 may include any other suitable components depending on the specific application.

[0103] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0104] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0105] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0106] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0107] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0108] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0109] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A vehicle drive system, characterized in that, include: Casing (110); The dual-rotor motor (120) includes an inner rotor (121) and an outer rotor (122) arranged coaxially nested. The first planetary gear set (130) includes a first sun gear (131), a first planetary assembly (132), a first gear ring (133), and a second gear ring (134). The first sun gear (131) is fixedly connected to the inner rotor (121), the first planetary assembly (132) is fixedly connected to the outer rotor (122), the first planetary assembly (132) is drivenly connected to the first sun gear (131), the inner side of the first gear ring (133) is drivenly connected to the first planetary assembly (132), and the second gear ring (134) is fixedly connected to the housing (110). The second planetary gear set (140) includes a second sun gear (141), a second planetary assembly (142), and a third ring gear (143). The second sun gear (141) is fixedly connected to the first planetary assembly (132), the second planetary assembly (142) is drivenly connected to the second sun gear (141), the inner side of the third ring gear (143) is drivenly connected to the second planetary assembly (142), and the third ring gear (143) is fixedly connected to the housing (110). The output shaft (150) is fixedly connected to the second planetary assembly (142); The shifting element (160) includes a first connecting part (161) and a second connecting part (162), wherein the first connecting part (161) is fixedly connected to the first gear ring (133); The controller is used to adjust the working state of the inner rotor (121) and the outer rotor (122), and to control the second connecting part (162) to be selectively connected to the inner side of the second gear ring (134) or the second planetary assembly (142).

2. The vehicle drive system according to claim 1, characterized in that, The shifting element (160) is configured as a synchronizer.

3. The vehicle drive system according to claim 1, characterized in that, The inner rotor (121), the outer rotor (122), the first sun gear (131), the second sun gear (141), and the output shaft (150) are coaxially arranged.

4. The vehicle drive system according to any one of claims 1 to 3, characterized in that, The first planetary assembly (132) includes: The first planetary carrier (1321) is fixedly connected to the outer rotor (122); wherein the second sun gear (141) is fixedly connected to the first planetary carrier (1321); The first planetary gear (1322) is located inside the first planet carrier (1321), and the first planetary gear (1322) is connected to the first sun gear (131) in a transmission connection. The second planetary gear (1323) is located on the outside of the first planetary carrier (1321), and the second planetary gear (1323) is connected to the inside of the first gear ring (133) for transmission.

5. The vehicle drive system according to claim 4, characterized in that, The vehicle drive system also includes: A parking mechanism (170) is provided inside the housing (110), and the parking mechanism (170) is connected to the first planetary carrier (1321) for locking the first planetary carrier (1321).

6. The vehicle drive system according to any one of claims 1 to 3, characterized in that, The second planetary component (142) includes: The second planetary carrier (1421) is fixedly connected to the output shaft (150); The third planetary gear (1422) is located inside the second planetary carrier (1421), and the third planetary gear (1422) is connected to the second sun gear (141) in a transmission connection. The fourth planetary gear (1423) is located on the outside of the second planetary carrier (1421), and the fourth planetary gear (1423) is connected to the inside of the third gear ring (143) for transmission. The fifth planetary gear (1424) is disposed on the second planetary carrier (1421) and is used to drive the second connecting part (162).

7. The vehicle drive system according to any one of claims 1 to 3, characterized in that, The vehicle drive system also includes: An oil pump (180) is located inside the housing (110) and is connected to the first planetary gear set (130), the second planetary gear set (140) and the shifting element (160) via pipelines.

8. A vehicle, characterized in that, include: Vehicle body; Wheel (210); In any one of claims 1 to 7, the housing (110) is fixedly connected to the vehicle body, and the output shaft (150) is fixedly connected to the wheel (210).

9. A vehicle driving method, characterized in that, The controller applied to the vehicle drive system as described in any one of claims 1 to 7; The vehicle driving method includes: Receive shift command; Adjust the working state of the inner rotor according to the shift command; and / or, Adjust the working state of the outer rotor according to the shift command; and / or, According to the shift command, the second connecting part is controlled to be connected to the inner side of the second gear ring or the second planetary assembly.

10. The vehicle driving method according to claim 9, characterized in that, The step of controlling the second connecting part to be connected to the inner side of the second gear ring or the second planetary assembly according to the shift command includes: Control the separation of the second connecting part from the second planetary assembly; When the speed difference between the second connecting part and the second gear ring is less than or equal to the first preset speed threshold, the inner transmission connection between the second connecting part and the second gear ring is controlled.

11. The vehicle driving method according to claim 9, characterized in that, The step of controlling the second connecting part to be connected to the inner side of the second gear ring or the second planetary assembly according to the shift command includes: Control the separation of the second connecting part from the inner side of the second gear ring; When the speed difference between the second connecting part and the second planetary assembly is less than or equal to the second preset speed threshold, the second connecting part is controlled to be connected to the second planetary assembly in a transmission manner.

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