Hybrid power system and vehicle

Abstract

The utility model provides a hybrid power system and a vehicle. The hybrid power system comprises a first planet row and a second planet row, wherein the first planet row comprises a first sun gear, a first planet carrier, a first planet gear and a first gear ring; the second planet row comprises a second sun gear, a second planet carrier, a second planet gear and a second gear ring; the first motor is connected to the first sun gear; the second motor is arranged between the first gear ring and the second sun gear; an engine connected to the second ring gear; a first clutch connecting the second motor to the first ring gear; a second clutch connecting the second motor to the second sun gear; a third clutch connecting the first carrier and the second carrier; a first brake connected to the first ring gear; a second brake connected to the second sun gear; a third brake connected to the second planet carrier; and an output shaft connected to the first planet carrier. According to the hybrid power system, multiple power modes are achieved, and the system efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, specifically to a hybrid power system, and further to a vehicle including the hybrid power system. Background Art

[0002] At present, the hybrid power system of new energy vehicles has relatively few power split configurations, which makes it difficult to meet the various operating conditions of the vehicle and cannot guarantee the system efficiency and fuel economy under various operating conditions. Utility Model Content

[0003] The present application aims to provide a hybrid power system and a vehicle to solve or alleviate at least part of the problems mentioned in the background technology.

[0004] To achieve one of the aforementioned purposes, according to one aspect of the present application, a hybrid power system is provided, the hybrid power system comprising: a first planetary gear, comprising a first sun gear, a first planetary carrier, a first planetary gear disposed on the first planetary carrier and meshed with the first sun gear, and a first ring gear meshed with the first planetary gear; a second planetary gear, comprising a second sun gear, a second planetary carrier, a second planetary gear disposed on the second planetary carrier and meshed with the second sun gear, and a second ring gear meshed with the second planetary gear; a first motor connected to the first sun gear; a second motor disposed between the first ring gear and the second sun gear; an engine connected to the second ring gear; a first clutch, which detachably connects the second motor to the first ring gear; a second clutch, which detachably connects the second motor to the second sun gear; a third clutch, which detachably connects the first planetary carrier to the second planetary carrier; a first brake, which is connected to the first ring gear; a second brake, which is connected to the second sun gear; a third brake, which is connected to the second planetary carrier; and an output shaft connected to the first planetary carrier.

[0005] In addition to one or more of the above features, or as an alternative, in another embodiment, the hybrid system has a level one pure electric mode, in which the first brake is locked, the second brake and the third brake are released, the first clutch, the second clutch and the third clutch are disengaged, and the first motor outputs power to the output shaft via the first sun gear and the first planetary carrier.

[0006] In addition to one or more of the above features, or as an alternative, in another embodiment, the hybrid system has a secondary pure electric mode, in which the first brake, the second brake and the third brake are all released, the first clutch is engaged, the second clutch and the third clutch are both disengaged, and the power output by the first motor and the second motor is transmitted to the output shaft after coupling at the first planetary gear.

[0007] In addition to one or more of the above features, or as an alternative, in another embodiment, the hybrid system has an input power split mode, in which the first brake is locked, the second brake and the third brake are both released, the first clutch is disengaged, the second clutch and the third clutch are both engaged, the engine is speed-coupled with the second motor at the second planetary gear and then torque-coupled with the first motor at the first planetary gear, and then power is output to the output shaft via the first planetary carrier.

[0008] In addition to one or more of the above features, or as an alternative, in another embodiment, the hybrid system has an output power split mode, in which the first brake and the second brake are both released, the third brake is locked, the first clutch and the second clutch are both engaged, the third clutch is disengaged, the engine is torque-coupled with the second motor at the second planetary gear and then speed-coupled with the first motor at the first planetary gear, and then power is output to the output shaft via the first planetary carrier.

[0009] In addition to one or more of the above features, or as an alternative, in another embodiment, the hybrid system has a compound power split mode, in which the first brake, the second brake and the third brake are all released, the first clutch, the second clutch and the third clutch are all engaged, and the speed and torque output by the engine are adjusted via the first motor and the second motor to match the speed and torque required by the output shaft.

[0010] In addition to one or more of the above features, or as an alternative, in another embodiment, the hybrid power system has a parallel mode, in which the second brake is locked, the third brake is released, the second clutch is disengaged, the third clutch is engaged, and the power output by the engine is transmitted to the output shaft via the second planetary gear ring, the second planetary gear carrier and the first planetary carrier.

[0011] In addition to one or more of the above features, or as an alternative, in another embodiment, the parallel mode includes a first-stage parallel mode, in which the first clutch is disengaged, the first brake is locked, and the engine and the first motor are torque-coupled at the first planetary gear so that the coupled torque matches the torque required by the output shaft.

[0012] In addition to one or more of the above features, or as an alternative, in another embodiment, the parallel mode includes a two-stage parallel mode, in which the first clutch is engaged, the first brake is released, the engine is torque-coupled with the first motor and the second motor at the first planetary gear so that the coupled torque matches the torque required by the output shaft, and the first motor and the second motor are speed-coupled at the first planetary gear.

[0013] In order to achieve one of the aforementioned purposes, according to another aspect of the present application, a vehicle is provided, the vehicle comprising the hybrid power system described in the aforementioned aspect.

[0014] According to the hybrid power system of the present application and the vehicle including the same, through the arrangement structure of dual motors, dual planetary gears and multiple clutches and brakes, it is possible to achieve multiple power modes by controlling each clutch and each brake, thereby greatly enriching the vehicle's working mode, enabling the engine and / or motor to operate in its high-efficiency zone under the appropriate working mode, improving the vehicle's fuel economy, and effectively improving the system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The disclosure of the present application will be more convenient to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application.

[0016] In the figure:

[0017] Figure 1 is a schematic structural diagram of a hybrid power system according to an embodiment of the present application;

[0018] Figure 2 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the first-level pure electric mode;

[0019] Figure 3 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the secondary pure electric mode;

[0020] Figure 4 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the input power split mode;

[0021] Figure 5 yes Figure 1 Schematic diagram of power transmission of the hybrid system in output power split mode;

[0022] Figure 6 yes Figure 1 Schematic diagram of power transmission of the hybrid system in compound split mode;

[0023] Figure 7 yes Figure 1 A schematic diagram of power transmission of the hybrid system in the primary parallel split mode; and

[0024] Figure 8 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the two-stage parallel split mode. DETAILED DESCRIPTION

[0025] The present application will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present application can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided here to make the disclosure of the present application more complete and clear, and to fully convey the concept of the present application to those skilled in the art.

[0026] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature displayed or implied in the accompanying drawings, it is easy for those skilled in the art to continue to make appropriate combinations or deletions between these technical features (or their equivalents), thereby obtaining more other embodiments of the present application that may not be directly mentioned in this document, and these embodiments do not deviate from the scope of the technical idea of ​​the present application.

[0027] It should be noted that the "power coupling" mentioned in this article includes "torque coupling" and / or speed coupling. The "torque coupling" between various power sources (including engines and motors) means: the torque output by each power source is independent, the speeds are in a certain proportional relationship, and the torque output by the power coupling is equal to the linear sum of the torques of each power source; the "speed coupling" between various power sources (including engines and motors) means: the speeds of each power source are independent of each other, the torques are in a certain proportional relationship, and the speed output by the power coupling is equal to the linear sum of the speeds of each power source. In addition, the "torque decoupling" between a certain power source and the output shaft mentioned in this article means that the torque output by the power source is not in a certain proportional relationship with the torque of the output shaft, and the "speed decoupling" between a certain power source and the output shaft means that the speed output by the power source is not in a certain proportional relationship with the torque of the output shaft.

[0028] In addition, it should be understood that the terms "first", "second", "primary", "secondary", etc. mentioned in this article are only used to distinguish different institutions or models, and do not have the meaning of limiting any order of priority, importance, or level.

[0029] Figure 1 : is a structural schematic diagram of a hybrid system according to an embodiment of the present application. It can be seen that the hybrid system includes a double planetary gear arrangement structure, and the double planetary gear includes: a first planetary gear 10, which includes a first sun gear 11, a first planetary carrier 12, a first planetary gear (not shown) arranged on the first planetary carrier 12 and meshed with the first sun gear 11, and a first ring gear 13 meshed with the first planetary gear, wherein the output shaft 70 of the hybrid system is connected to the first planetary carrier 12; and a second planetary gear 20, which includes a second sun gear 21, a second planetary carrier 22, a second planetary gear (not shown) arranged on the second planetary carrier 22 and meshed with the second sun gear 21, and a second ring gear 23 meshed with the second planetary gear. The hybrid system includes three power sources, namely a first motor 31 rigidly connected to the first sun gear 11, a second motor 32 arranged between the first ring gear 13 and the second sun gear 21, and an engine 40 rigidly connected to the second ring gear 23. The hybrid system also includes a first clutch 51, a second clutch 52, a third clutch 53, and a first brake 61, a second brake 62, and a third brake 63. The first clutch 51 is rigidly connected between the second motor 32 and the first ring gear 13 to connect or disconnect the second motor 32 and the first ring gear 13 by engaging or disconnecting. The second clutch 52 is rigidly connected between the second motor 32 and the second sun gear 21 to connect or disconnect the second motor 32 with the second sun gear 21 by engaging or disconnecting. The third clutch 53 is rigidly connected between the first planetary carrier 12 and the second planetary carrier 22 to connect or disconnect the first planetary carrier 12 with the second planetary carrier 22 by engaging and disconnecting. The first brake 61 is rigidly connected to the first ring gear 13 for braking or unlocking the first ring gear 13. The second brake 62 is rigidly connected to the second sun gear 21 for braking or unlocking the second sun gear 21. The third brake 63 is rigidly connected to the second planetary carrier 22 for braking or unlocking the second planetary carrier 22.

[0030] Under this arrangement, the hybrid power system with dual motors and dual planetary gears described in this article realizes multiple power modes such as pure electric mode, input power split mode, output power split mode, compound power split mode and parallel mode by controlling each clutch and each brake, which greatly enriches the vehicle's working mode. By selecting and switching different modes, the engine and / or motor can be controlled to operate in a high-efficiency area, thereby improving the vehicle's fuel economy and effectively improving system efficiency.

[0031] The following will introduce further specific implementation or refinement and improvement process of the hybrid power system through exemplary descriptions, so as to further improve its working efficiency, reliability or for other improvement considerations.

[0032] Combine the following Figure 2-Figure 8 A schematic diagram of power transmission of a hybrid power system in different working modes according to an embodiment of the present application is introduced, wherein a thick solid line with an arrow indicates the direction of power transmission, and the thick solid line is not drawn coaxially with a thin solid line indicating the connecting axis between the components to avoid unclear display.

[0033] A hybrid power system in one embodiment of the present application has a pure electric mode, including a first-level pure electric mode and a second-level pure electric mode. Figure 2 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the first-level pure electric mode. This mode is suitable for low and medium speed conditions and reverse driving conditions where the power of the power battery meets the usage requirements. In the first-level pure electric mode, the first brake 61 is locked, the second brake 62 and the third brake 63 are released, the first clutch 51, the second clutch 52 and the third clutch 53 are separated, the first motor 31 is working, and the power is transmitted from the first motor 31 to the output shaft 70 via the first sun gear 11 and the first planetary carrier 12.

[0034] Figure 3 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the secondary pure electric mode. This mode is suitable for high-speed driving conditions where the power of the power battery meets the use requirements. In the secondary pure electric mode, the first brake 61, the second brake 62 and the third brake 63 are all released, the first clutch 51 is engaged, the second clutch 52 and the third clutch 53 are both separated, the first motor 31 and the second motor 32 are both working, and the power output by the two is coupled at the first planetary gear 10 and transmitted to the output shaft 70. In this mode, the speed of the first motor 31 and the second motor 32 is decoupled from the vehicle speed (i.e., the speed of the output shaft 70), and the speeds of the two can be adjusted and supplemented to each other to avoid the problem of efficiency reduction caused by excessive motor speed, while also reducing the high speed requirements for a single motor.

[0035] Figure 4 Shows Figure 1Schematic diagram of power transmission of the hybrid system in the input power split mode. This mode is applicable to medium and low vehicle speed conditions when the power battery is fed. In the input power split mode, the first brake 61 is locked, the second brake 62 and the third brake 63 are both released, the first clutch 51 is disengaged, the second clutch 52 and the third clutch 53 are both engaged, and the engine 40, the first motor 31 and the second motor 32 are all running. The power output by the engine 40 and the second motor 32 is coupled at the second planetary gear 20 and then merged with the power output by the first motor 31 through the first planetary gear 10, and then transmitted to the output shaft 70. Specifically, the engine 40 is speed-coupled with the second motor 32 at the second planetary gear 20 and then torque-coupled with the first motor 31 at the first planetary gear 10, and then the power is output to the output shaft 70 via the first planetary carrier 12. The speed coupling between the engine 40 and the second motor 32 can decouple the speed of the engine 40 from the speed of the output shaft 70, that is, the speed of the engine 40 is not in a fixed proportional relationship with the speed of the output shaft 70, and the second motor 32 can dynamically adjust the speed of the engine 40, and the contribution of the engine 40 to the speed of the output shaft 70 can be adjusted by increasing or decreasing the contribution of the second motor 32 to the speed of the output shaft 70, so that the engine 40 can always operate in its high efficiency area. At the same time, the torque coupling at the first planetary gear 10 can decouple the torque of the engine 40 from the torque of the output shaft 70, that is, the torque of the engine 40 is not in a fixed proportional relationship with the torque of the output shaft 70, and the first motor 31 can dynamically adjust the torque of the engine 40, and the contribution of the engine 40 to the torque of the output shaft 70 can be adjusted by increasing or decreasing the contribution of the second motor 32 to the torque of the output shaft 70, so that the engine 40 can always operate in its high efficiency area.

[0036] Figure 5 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the output power split mode. This mode is also applicable to medium and low vehicle speed conditions when the power battery is fed. The vehicle can determine whether to select the input power split mode or the output power split mode under this condition based on the system efficiency. In the output power split mode, the first brake 61 and the second brake 62 are both released, the third brake 63 is locked, the first clutch 51 and the second clutch 52 are both engaged, and the third clutch 53 is separated. The engine 40 is torque-coupled with the second motor 32 at the second planetary gear 20 and then speed-coupled with the first motor 31 at the first planetary gear 10, and then outputs power to the output shaft 70. In this mode, the torque of the engine 40 is decoupled and dynamically adjusted from the torque of the output shaft 70 through the second motor 32, and the speed of the engine 40 is decoupled and dynamically adjusted from the speed of the output shaft 70 through the first motor 31 and the first planetary gear 10, thereby achieving efficient operation of the engine 40.

[0037] Figure 6 yes Figure 1 Schematic diagram of power transmission of the hybrid system in the compound split mode. This mode is suitable for high-speed conditions when the battery is fed. In the compound power split mode, the first brake 61, the second brake 62 and the third brake 63 are all released, the first clutch 51, the second clutch 52 and the third clutch 53 are all engaged, and the speed and torque output by the engine 40 are adjusted to match the speed and torque required by the output shaft 70 via the first motor 31 and the second motor 32. Among them, the speed and torque of the engine 40 are decoupled from the speed and torque of the output shaft 70, and the adjustment of the working point of the engine 40 is achieved by adjusting the speed and torque of the first motor 31 and the second motor 32, so that the engine 40 operates in the high-efficiency zone.

[0038] The hybrid system according to one embodiment of the present application also has a parallel mode. This mode is suitable for the driver's demand condition to be in the high-efficiency zone of the engine 40, and at this time, there is no need to make excessive adjustments to the engine 40 working point. In the parallel mode, the second brake 62 is locked, the third brake 63 is released, the second clutch 52 is separated, the third clutch 53 is combined, the first brake 61 is selectively locked or released according to the strategic needs, and the first clutch 51 is selectively separated or combined according to the strategic needs. The power output by the engine 40 is transmitted to the output shaft 70 through the second ring gear 23, the second planetary carrier 22 and the first planetary carrier 12, and the first motor 31 and the second motor 32 can further adjust the engine 40 working point according to the strategic needs to make the engine 40 work at the most economical point. The engine 40 speed is coupled with the vehicle speed (that is, the engine 40 speed is in a fixed ratio with the output shaft 70 speed), and the engine 40 torque is decoupled from the output shaft 70 torque through the first motor 31 and the second motor 32, that is, the engine 40 torque can be dynamically adjusted via the first motor 31 and / or the second motor 32. In addition, the first motor 31 and the second motor 32 can achieve decoupling of the rotational speed of the first motor 31 and the second motor 32 from the vehicle speed through the first planetary gear 10, that is, their respective rotational speeds can be adjusted to each other, thereby avoiding unexpected situations such as excessive rotational speed of one motor or reversal.

[0039] In a more specific embodiment, the parallel mode includes Figure 7 The first-stage parallel mode and Figure 8 The two-stage parallel mode shown in . Figure 7 As shown, in the primary parallel mode, the first clutch 51 is disengaged, the first brake 61 is locked, and the engine 40 and the first motor 31 are torque-coupled at the first planetary gear 10 so that the coupled torque matches the torque required by the output shaft 70. Figure 8As shown, in the two-stage parallel mode, the first clutch 51 is engaged, the first brake 61 is released, and the engine 40 is torque-coupled with the first motor 31 and the second motor 32 at the first planetary gear 10 so that the coupled torque matches the torque required by the output shaft 70. In addition, the first motor 31 and the second motor 32 are speed-coupled at the first planetary gear 10 to achieve mutual adjustment of the speeds.

[0040] Under this arrangement, the dual-motor dual-planetary gear hybrid power system according to the present application can realize multiple operating modes such as pure electric mode, input power split mode, output power split mode, compound power split mode, parallel mode, etc., and can switch the operating mode by controlling the state of each clutch and each brake, so as to adapt to different driving conditions and select a mode with higher system efficiency, thereby achieving higher adaptability, practicality and economy of the vehicle.

[0041] The above examples mainly illustrate the hybrid power system and vehicle of the present application. Although only some of the embodiments of the present application are described, it should be understood by those skilled in the art that the present application can be implemented in many other forms without departing from its subject matter and scope. Therefore, the examples and embodiments shown are regarded as illustrative rather than restrictive, and the present application may cover various modifications and replacements without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A hybrid power system, characterized in that: The hybrid power system comprises: A first planetary gear, comprising a first sun gear, a first planet carrier, a first planetary gear disposed on the first planet carrier and meshing with the first sun gear, and a first ring gear meshing with the first planetary gear; a second planetary gear, comprising a second sun gear, a second planet carrier, a second planetary gear disposed on the second planet carrier and meshing with the second sun gear, and a second ring gear meshing with the second planetary gear; a first electric machine connected to the first sun gear; a second motor, disposed between the first ring gear and the second sun gear; an engine connected to the second ring gear; a first clutch that detachably connects the second motor to the first ring gear; a second clutch that releasably connects the second electric machine to the second sun gear; a third clutch that disconnectably connects the first planet carrier with the second planet carrier; a first brake connected to the first ring gear; a second brake connected to the second sun gear; a third brake connected to the second planet carrier; and An output shaft is connected to the first planet carrier.

2. The hybrid power system according to claim 1, characterized in that: The hybrid system has a first-level pure electric mode. In the first-level pure electric mode, the first brake is locked, the second brake and the third brake are released, the first clutch, the second clutch and the third clutch are disengaged, and the first motor outputs power to the output shaft via the first sun gear and the first planetary carrier.

3. The hybrid power system according to claim 1, characterized in that: The hybrid system has a secondary pure electric mode. In the secondary pure electric mode, the first brake, the second brake and the third brake are all released, the first clutch is engaged, the second clutch and the third clutch are both disengaged, and the power output by the first motor and the second motor is coupled at the first planetary gear and then transmitted to the output shaft.

4. The hybrid power system according to claim 1, characterized in that: The hybrid system has an input power split mode. In the input power split mode, the first brake is locked, the second brake and the third brake are both released, the first clutch is disengaged, the second clutch and the third clutch are both engaged, the engine is speed-coupled with the second motor at the second planetary gear and then torque-coupled with the first motor at the first planetary gear, and then power is output to the output shaft via the first planetary carrier.

5. The hybrid power system according to any one of claims 1 to 4, characterized in that: The hybrid system has an output power split mode. In the output power split mode, the first brake and the second brake are both released, the third brake is locked, the first clutch and the second clutch are both engaged, the third clutch is disengaged, the engine is torque-coupled with the second motor at the second planetary gear and then speed-coupled with the first motor at the first planetary gear, and then power is output to the output shaft via the first planetary carrier.

6. The hybrid power system according to any one of claims 1 to 4, characterized in that: The hybrid power system has a compound power split mode. In the compound power split mode, the first brake, the second brake and the third brake are all released, the first clutch, the second clutch and the third clutch are all engaged, and the speed and torque output by the engine are adjusted via the first motor and the second motor to match the speed and torque required by the output shaft.

7. The hybrid power system according to any one of claims 1 to 4, characterized in that: The hybrid power system has a parallel mode. In the parallel mode, the second brake is locked, the third brake is released, the second clutch is disengaged, the third clutch is engaged, and the power output by the engine is transmitted to the output shaft via the second planetary gear ring, the second planetary gear carrier and the first planetary carrier.

8. The hybrid power system according to claim 7, characterized in that: The parallel mode includes a primary parallel mode, in which the first clutch is disengaged, the first brake is locked, and the engine and the first motor are torque-coupled at the first planetary gear so that the coupled torque matches the torque required by the output shaft.

9. The hybrid power system according to claim 7, characterized in that: The parallel mode includes a two-stage parallel mode, in which the first clutch is engaged, the first brake is released, the engine is torque-coupled with the first motor and the second motor at the first planetary gear so that the coupled torque matches the torque required by the output shaft, and the first motor and the second motor are speed-coupled at the first planetary gear.

10. A vehicle, characterized in that: The vehicle comprises a hybrid powertrain according to any one of claims 1-9.

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