Power driving system and method, controller and vehicle

Abstract

The invention belongs to the technical field of vehicle driving systems, and particularly relates to a power driving system and method, a controller and a vehicle. In the power driving system, an engine is connected with a first planetary mechanism, the first planetary mechanism is connected with the first end of a generator through a first shaft, and the second end of the generator is connected with a second planetary mechanism through a second shaft; the second planetary mechanism is connected with a third planetary mechanism through a third shaft; the driving motor is connected with a vehicle half shaft through the third planetary mechanism; the first shaft, the second shaft and the third shaft are coaxially arranged. According to the power driving system, the engine, the first planetary mechanism, the generator, the second planetary mechanism, the driving motor and the third planetary mechanism are longitudinally arranged along the same axis, so that the compactness of the power driving system is improved, and the occupied space of the power driving system is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle drive systems, and in particular relates to a power drive system, method, controller and vehicle. Background Art

[0002] In a vehicle having a hybrid power system composed of a motor and an engine, the engine and / or the motor can be used to drive the wheels to rotate according to different working conditions, which has the advantages of good power performance and high efficiency. In the prior art, the hybrid power system has a complex structure, and the axis of the motor and the axis of the engine are usually staggered, which increases the space occupied by the hybrid power system. Summary of the invention

[0003] The present invention aims at the technical problem that the hybrid power system in the prior art occupies a large space, and proposes a power drive system, method, controller and vehicle.

[0004] To solve the above problems, an embodiment of the present invention provides a power drive system, including an engine, a generator, a drive motor, a first planetary mechanism, a second planetary mechanism, a third planetary mechanism, a first shaft, a second shaft and a third shaft; The engine is connected to the first planetary mechanism, the first planetary mechanism is connected to the first end of the generator through the first shaft, the second end of the generator is connected to the second planetary mechanism through the second shaft, the second planetary mechanism is connected to the third planetary mechanism through the third shaft, and the drive motor is connected to the vehicle half shaft through the third planetary mechanism; the first shaft, the second shaft and the third shaft are coaxially arranged.

[0005] Optionally, the first planetary mechanism includes a first sun gear, a first planet gear, a first planet carrier and a first ring gear; the first planet gear is mounted on the first planet carrier and meshes with the first sun gear, and the first ring gear meshes with the first planet gear; The engine is connected to the first planet carrier, and one end of the first shaft away from the generator is connected to the first sun gear.

[0006] Optionally, the second planetary mechanism includes a second sun gear, a second planetary gear, a second planet carrier and a second ring gear; the second planetary gear is mounted on the second planet carrier and meshes with the second sun gear, and the second ring gear meshes with the second planetary gear; the end of the second shaft away from the generator is connected to the second ring gear, and the end of the third shaft away from the third planetary mechanism is connected to the second planet carrier.

[0007] Optionally, the power drive system further comprises a brake and a clutch, wherein the brake is connected to the second sun gear; The clutch comprises a first clutch hub and a second clutch hub which are arranged opposite to each other, wherein the first clutch hub is connected to the second ring gear, and the second clutch hub is connected to the second sun gear or the second planet carrier; and an end of the second shaft away from the generator is connected to the first clutch hub.

[0008] Optionally, the third planetary mechanism includes a third sun gear, a third planetary gear, a third planet carrier and a third ring gear; the drive motor is connected to the third sun gear, the third planetary gear is mounted on the third planet carrier and meshes with the third sun gear, and the third ring gear meshes with the third planetary gear; The opposite ends of the third shaft are respectively connected to the second planet carrier and the third planet carrier, and the third planet carrier is connected to the vehicle half shaft.

[0009] Optionally, the power drive system has a series extended-range mode: the brake and the clutch are both disengaged, the engine drives the generator to rotate through the first planetary mechanism and the first shaft in sequence, the generator generates electricity and stores the electrical energy in the vehicle battery; the power of the drive motor is transmitted to the vehicle half-axle through the third planetary mechanism.

[0010] An embodiment of the present invention further provides a power driving method, which is applied to the above-mentioned power driving system; the power driving method comprises: The remaining power of the vehicle battery is obtained, a target drive element is determined according to the remaining power, and the wheels are driven to rotate through a preset drive path including the target drive element; the target drive element is at least one of the engine, the generator and the drive motor.

[0011] Optionally, determining a target driving element according to the remaining power, and driving the wheel to rotate along a preset driving path through the target driving element, includes: When the remaining power is greater than or equal to a first preset power, the target driving element is determined to be the driving motor; and the preset driving path includes the driving motor, the third planetary mechanism and the vehicle half-axle.

[0012] Optionally, determining a target driving element according to the remaining power includes: When the remaining power is greater than a second preset power and less than the first preset power, a target drive element is determined from the engine, the generator and the drive motor according to the real-time speed of the vehicle; wherein the first preset power is greater than the second preset power.

[0013] Optionally, determining a target drive element from among the engine, the generator, and the drive motor according to the real-time speed of the vehicle includes: When it is detected that the real-time vehicle speed is greater than or equal to the preset vehicle speed, it is determined that the target driving element includes the engine and the driving motor; the preset driving path includes: a first path formed by the engine, the first planetary mechanism, the first shaft, the second planetary mechanism, the third shaft, the third planetary mechanism and the vehicle half-shaft, and a second path formed by the driving motor, the third planetary mechanism and the vehicle half-shaft.

[0014] Optionally, determining a target drive element from among the engine, the generator, and the drive motor according to the real-time speed of the vehicle includes: When it is detected that the real-time vehicle speed is less than the preset vehicle speed, if the power demand of the vehicle is greater than or equal to the preset power, the engine is controlled to drive the generator to rotate so as to generate electricity for the vehicle battery through a preset power generation path, and it is determined that the target drive element includes the drive motor; the preset drive path includes the drive motor, the third planetary mechanism and the vehicle half shaft; the power generation path includes the engine, the first planetary mechanism, the first shaft and the generator.

[0015] Optionally, determining a target drive element from among the engine, the generator, and the drive motor according to the real-time speed of the vehicle includes: When it is detected that the real-time vehicle speed is less than the preset vehicle speed, if the power demand of the vehicle is less than the preset power, it is determined that the target driving element includes the driving motor; the preset driving path includes the driving motor, the third planetary mechanism and the vehicle half shaft.

[0016] Optionally, determining a target driving element according to the remaining power, and driving the wheel to rotate along a preset driving path through the target driving element, includes: When the remaining power is less than or equal to the second preset power, the engine is controlled to drive the generator to rotate, so as to generate electricity for the vehicle battery through a preset power generation path, and at the same time, the target driving element is determined to be the drive motor, and the wheels are driven to rotate through a third preset drive path; the third preset drive path includes the drive motor, the third planetary mechanism and the vehicle half-axle; the power generation path includes the engine, the first planetary mechanism, the first shaft and the generator.

[0017] An embodiment of the present invention further provides a controller for executing the above-mentioned power driving method.

[0018] An embodiment of the present invention further provides a vehicle, comprising the above-mentioned power drive system, or comprising the above-mentioned controller.

[0019] In the present invention, the engine is connected to the first planetary mechanism, the first planetary mechanism is connected to the first end of the generator through the first shaft, the second end of the generator is connected to the second planetary mechanism through the second shaft, the second planetary mechanism is connected to the third planetary mechanism through the third shaft, the drive motor is connected to the third planetary mechanism, and the third planetary mechanism is connected to the vehicle half shaft; the first shaft, the second shaft and the third shaft are coaxially arranged, so that the engine, the first planetary mechanism, the generator, the second planetary mechanism, the drive motor and the third planetary mechanism are arranged longitudinally along the same axis, and no additional components need to be arranged in the transverse direction, thereby improving the compactness of the power drive system and reducing the occupied space of the power drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 A schematic diagram of a power drive system provided by an embodiment of the present invention in a pure electric drive mode; Figure 2 A schematic diagram of a power drive system provided by an embodiment of the present invention in a series range-extended mode; Figure 3 A schematic diagram of a power drive system provided by an embodiment of the present invention in an engine direct one-gear drive mode or a parallel one-gear mode; Figure 4 A schematic diagram of a power drive system provided by an embodiment of the present invention in an engine direct drive second gear mode or a parallel second gear mode; Figure 5 A schematic diagram of a power drive system provided by an embodiment of the present invention in a parking power generation mode; Figure 6 A schematic diagram of a power drive system in a braking energy recovery mode provided by an embodiment of the present invention; Figure 7 A management schematic diagram of a power drive system provided by an embodiment of the present invention.

[0022] The reference numerals in the specification are as follows: 1. Engine; 2. Generator; 3. Drive motor; 4. First planetary mechanism; 41. First sun gear; 42. First planetary gear; 43. First planetary carrier; 44. First ring gear; 5. Second planetary mechanism; 51. Second sun gear; 52. Second planetary gear; 53. Second planetary carrier; 54. Second ring gear; 6. Third planetary mechanism; 61. Third sun gear; 62. Third planetary gear; 63. Third planetary carrier; 64. Third ring gear; 7. First shaft; 8. Second shaft; 9. Third shaft; 101. Vehicle half shaft; 102. Brake; 103. Clutch; 104. Torsional damper; 105. Fourth shaft; 106. Bevel gear. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] It should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", and "middle" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation of the present invention.

[0025] like Figure 1 As shown, a power drive system provided by the first embodiment of the present invention includes an engine 1, a generator 2, a drive motor 3, a first planetary mechanism 4, a second planetary mechanism 5, a third planetary mechanism 6, a first shaft 7, a second shaft 8 and a third shaft 9; The engine 1 is connected to the first planetary mechanism 4, the first planetary mechanism 4 is connected to the first end of the generator 2 through the first shaft 7, the second end of the generator 2 is connected to the second planetary mechanism 5 through the second shaft 8, the second planetary mechanism 5 is connected to the third planetary mechanism 6 through the third shaft 9, and the drive motor 3 is connected to the vehicle half shaft 101 through the third planetary mechanism 6; the first shaft 7, the second shaft 8 and the third shaft 9 are coaxially arranged. It can be understood that the forms of the first planetary mechanism 4, the second planetary mechanism 5 and the third planetary mechanism 6 can be set according to actual needs, and by controlling the combination and separation of the components in the second planetary mechanism 5, the power on the second shaft 8 can be transmitted to the vehicle half shaft 101 through the second planetary mechanism 5, the third shaft 9 and the third planetary mechanism 6, and the power on the second shaft 8 can come from the engine 1 or the generator 2; the drive motor 3 can directly drive the wheels to rotate through the third planetary mechanism 6.

[0026] In the above embodiment of the present invention, the engine 1 is connected to the first planetary mechanism 4, the first planetary mechanism 4 is connected to the first end of the generator 2 through the first shaft 7, the second end of the generator 2 is connected to the second planetary mechanism through the second shaft 8, the second planetary mechanism 5 is connected to the third planetary mechanism 6 through the third shaft 9, the drive motor 3 is connected to the third planetary mechanism 6, and the third planetary mechanism 6 is connected to the vehicle half shaft 101; the first shaft 7, the second shaft 8 and the third shaft 9 are coaxially arranged, so that the engine 1, the first planetary mechanism 4, the generator 2, the second planetary mechanism 5, the drive motor 3 and the third planetary mechanism 6 are arranged longitudinally along the same axis, and no additional components need to be arranged in the transverse direction, thereby improving the compactness of the power drive system and reducing the occupied space of the power drive system.

[0027] In one embodiment, if Figure 1 As shown, the first planetary mechanism 4 includes a first sun gear 41, a first planetary gear 42, a first planetary carrier 43 and a first ring gear 44; the first planetary gear 42 is mounted on the first planetary carrier 43 and meshes with the first sun gear 41, and the first ring gear 44 meshes with the first planetary gear 42; the engine 1 is connected to the first planetary carrier 43, and the end of the first shaft 7 away from the generator 2 is connected to the first sun gear 41.

[0028] Specifically, the engine 1 can sequentially drive the generator 2 to rotate through the first planet carrier 43, the first planetary gear 42, the first sun gear 41 and the first shaft 7, and the generator 2 generates electricity and charges the vehicle battery; when the generator 2 is idling, the engine 1 can also sequentially drive the vehicle half shaft 101 to rotate through the first planet carrier 43, the first planetary gear 42, the first sun gear 41, the first shaft 7, the second shaft 8, the second planetary mechanism 5, the third shaft 9 and the third planetary mechanism 6. In this embodiment, the power drive system has a compact structure and occupies a small space.

[0029] In one embodiment, if Figure 1 As shown, the second planetary mechanism 5 includes a second sun gear 51, a second planetary gear 52, a second planetary carrier 53 and a second ring gear 54; the second planetary gear 52 is mounted on the second planetary carrier 53 and meshes with the second sun gear 51, and the second ring gear 54 meshes with the second planetary gear 52; the end of the second shaft 8 away from the generator 2 is connected to the second ring gear 54, and the end of the third shaft 9 away from the third planetary mechanism 6 is connected to the second planetary carrier 53.

[0030] Specifically, the second shaft 8 drives the second gear ring 54, which can directly drive the second planet carrier 53 to rotate, and the second gear ring 54 can also drive the second planet carrier 53 to rotate through the second planetary gear 52. In this embodiment, the second planetary mechanism 5 has a compact structure and occupies a small space.

[0031] In one embodiment, if Figure 1As shown, the power drive system also includes a brake 102 and a clutch 103, and the brake 102 is connected to the second sun gear 51; it can be understood that the clutch 103 includes a first coupling hub mounted on the vehicle body and a second coupling hub mounted on the second sun gear 51; when the first coupling hub is coupled with the second coupling hub, the brake 102 is in a coupled state, and the second sun gear 51 will not be able to rotate; when the first coupling hub is separated from the second coupling hub, the brake 102 is in a separated state, and the second sun gear 51 can rotate freely.

[0032] The clutch 103 includes a first clutch hub (not shown in the figure) and a second clutch hub (not shown in the figure) arranged opposite to each other, the first clutch hub is connected to the second gear ring 54, and the second clutch hub is connected to the second sun gear 51 or the second planetary carrier 53; the end of the second shaft 8 away from the generator 2 is connected to the first clutch hub. It can be understood that the end of the second shaft 8 away from the generator 2 is connected to the second inner gear ring through the first clutch hub (that is, the second shaft 8 is connected to the second inner gear ring 54 through the first clutch hub); the first clutch hub and the second clutch hub can be in a state of engagement or separation.

[0033] Specifically, the second clutch hub is connected to the second sun gear 51. When the first clutch hub is combined with the second clutch hub, the second sun gear 51 and the second ring gear 54 rotate synchronously. The second clutch hub is connected to the second planetary carrier 53. When the first clutch hub is combined with the second clutch hub, the second planetary carrier 53 and the second ring gear 54 rotate synchronously.

[0034] In one embodiment, if Figure 1 As shown, the third planetary mechanism 6 includes a third sun gear 61, a third planetary gear 62, a third planetary carrier 63 and a third ring gear 64; the drive motor 3 is connected to the third sun gear 61, the third planetary gear 62 is mounted on the third planetary carrier 63 and meshes with the third sun gear 61, and the third ring gear 64 meshes with the third planetary gear 62; the opposite ends of the third shaft 9 are respectively connected to the second planetary carrier 53 and the third planetary carrier 63, and the third planetary carrier 63 is connected to the vehicle half shaft 101. It can be understood that the drive motor 3 is connected to the third sun gear 61 through a hollow shaft, and the end of the third shaft 9 away from the second planetary carrier 53 passes through the inner hole of the hollow shaft and then connects to the third planetary carrier 63.

[0035] Specifically, the driving motor 3 drives the third sun gear 61 to rotate, the third sun gear 61 drives the third planetary gear 62 to rotate, the third planetary gear 62 drives the third planetary carrier 63 to rotate, and the third planetary carrier 63 drives the wheels to rotate through the vehicle half shaft 101; in addition, the second planetary carrier 53 (second planetary carrier 53) can also drive the wheels to rotate through the third sun gear 61, the third planetary gear 62, the third planetary carrier 63 and the vehicle half shaft 101 in sequence; in addition, the vehicle half shaft 101 can drive the generator 2 to rotate through the third planetary carrier 63, the third planetary gear 62, the third sun gear 61, the third shaft 9, the second planetary mechanism 5 and the second shaft 8 in sequence, and the generator 2 stores the electric energy in the vehicle battery. In this embodiment, the opposite ends of the third shaft 9 are respectively connected to the second planetary carrier 53 and the third planetary carrier 63, which further improves the compactness of the power drive system.

[0036] In one embodiment, the power drive system has a series extended-range mode: the brake 102 and the clutch 103 are both disengaged, the engine 1 drives the generator 2 to rotate through the first planetary mechanism 4 and the first shaft 7 in sequence, the generator 2 generates electricity and stores the electrical energy in the vehicle battery; the power of the drive motor 3 is transmitted to the vehicle half-axle 101 through the third planetary mechanism 6.

[0037] In such Figure 1 In the specific embodiment shown (the second clutch hub is connected to the second sun gear 51), (1) as Figure 1 As shown, when the brake 102 and the clutch 103 are both disengaged, the power of the drive motor 3 will be transmitted to the vehicle half-axle 101 through the third planetary mechanism 6. At this time, the power drive system is in a single-motor pure electric drive mode.

[0038] (2) If Figure 2 As shown, when the brake 102 and the clutch 103 are both disengaged, the engine 1 sequentially drives the generator 2 to rotate through the first planetary mechanism 4 and the first shaft 7, and the generator 2 generates electricity and stores the electric energy in the vehicle battery; the power of the drive motor 3 will be transmitted to the vehicle half shaft 101 through the third planetary mechanism 6. At this time, the power drive system is in the series range extension mode. To further illustrate, in the series range extension mode, the generator 2 can be driven to start the generator 2 in advance, and the engine 1 is in the driving state after starting, and the generator 2 is in the power generation state.

[0039] (3) If Figure 3As shown, when the brake 102 is engaged and the clutch 103 is disengaged, the power of the engine 1 sequentially drives the vehicle half shaft 101 through the first planetary mechanism 4, the first shaft 7, the second shaft 8, the second gear ring 54, the second planetary gear 52, the second planetary carrier 53, the third shaft 9 and the third planetary mechanism 6; the power of the drive motor 3 will be transmitted to the vehicle half shaft 101 through the third planetary mechanism 6. At this time, the power drive system is in the parallel first gear mode. Among them, when the drive motor 3 is not working, the power drive system is in the engine direct drive first gear mode.

[0040] (4) If Figure 4 As shown, when the brake 102 is disengaged and the clutch 103 is engaged, the power of the engine 1 sequentially drives the vehicle half shaft 101 through the first planetary mechanism 4, the first shaft 7, the second shaft 8, the clutch 103, the second planetary carrier 53, the third shaft 9 and the third planetary mechanism 6; the power of the drive motor 3 will be transmitted to the vehicle half shaft 101 through the third planetary mechanism 6. At this time, the power drive system is in the parallel second gear mode. Among them, when the drive motor 3 is not working, the power drive system is in the engine direct drive second gear mode.

[0041] (5) If Figure 5 As shown, when the brake 102 and the clutch 103 are both disengaged, the engine 1 sequentially drives the generator 2 to rotate through the first planetary mechanism 4 and the first shaft 7, and the generator 2 generates electricity and stores the electricity in the vehicle battery. At this time, the power drive system is in the parking power generation mode. To further illustrate, in the parking power generation mode, the generator 2 can be driven to start the generator 2 in advance, and the engine 1 is in the driving state after starting, and the generator 2 is in the power generation state.

[0042] (6) Figure 6 As shown, when the brake 102 and the clutch 103 are both disengaged, the power of the wheels is sequentially transmitted to the drive motor 3 through the vehicle half-shaft 101, the third shaft 9, and the third planetary mechanism 6. The drive motor 3 rotates and generates electricity. The electric energy generated by the drive motor 3 is transmitted to the vehicle battery for storage. At this time, the power drive system is in a braking energy recovery mode.

[0043] In summary, the driving modes of the power drive system are shown in the following table: For further analysis, the single engagement of the brake 102 or the clutch 103 is named as gear engagement; the single separation of the brake 102 or the clutch 103 is named as gear disengagement; the simultaneous action of the brake 102 and the clutch 103, one separation and the other engagement, is named as gear shifting; the control of the engine 1 to participate in the work is named as starting the engine 1; the control of the engine 1 to quit the work is named as stopping the engine 1; each of the above actions occurs in different mode switching scenarios, and the participating components are different, so the relevant power components and the combined components (brake 102 and clutch 103) need to be coordinated and controlled accordingly to achieve smooth and fast mode switching. The mode switching actions are as follows: According to the table above, the state of the power drive system before and after the mode switching can be compared, and the mode switching process of the power drive system can be divided into two categories: The first type is the mode switching that does not require the action of the clutch 103. During this mode switching process, the working state of the clutch 103 of the power drive system does not need to change. Only the working state of the power source (engine 1, generator 2 and drive motor 3) needs to be changed to realize the mode switching function of the power drive system. For example, when switching from a single-motor pure electric drive mode to a series extended-range mode, before and after the mode switching, the engagement state of the clutch 103 does not change. Only the engine 1 needs to be switched from the shutdown state to the drive state, and the generator 2 needs to be switched from the shutdown state to the power generation state; The second type is the mode switching of the clutch 103 and the brake 102. In this type of switching process, only the clutch 103 or the brake 102 needs to be activated. For example, in the mode switching between the series range extension and the parallel first gear, the state of the engine 1 and the generator 2 does not change before and after the mode switching, and only the brake 102 needs to be switched from the disengaged state to the engaged state; in the switching between the parallel first gear mode and the parallel second gear mode, the state of the engine 1 and the generator 2 does not change, and only the state of the separator disengaged and the brake 102 engaged needs to be switched to the state of the separator engaged and the brake 102 disengaged.

[0044] In summary, the power drive system can realize multiple working modes such as two gears of engine direct drive mode, one gear of single motor pure electric mode, one series extended range mode, two parallel drive modes, brake energy recovery and parking power generation; in addition, during the mode switching process, the drive motor 3 participates in the drive, and there is no power interruption; in addition, the power drive system adopts three planetary mechanisms, a clutch 103 and a brake 102 to realize two-speed shifting, and it has good gear shifting smoothness.

[0045] In one embodiment, if Figure 1As shown, the power drive system further includes a torsional damper 104, and the engine 1 is connected to the end of the first shaft 7 away from the generator 2 through the torsional damper 104. It can be understood that the power of the engine 1 is transmitted to the first shaft 7 through the torsional damper 104, and the torsional damper 104 can play a role in shock absorption, thereby ensuring the stability of the power of the engine 1 being transmitted to the rear end.

[0046] In one embodiment, if Figure 1 As shown, the power drive system also includes a fourth shaft 105 and a bevel gear 106. The third planetary mechanism 6 is connected to the bevel gear 106 through the fourth shaft 105, and the bevel gear 106 is meshed with the differential gear on the vehicle half shaft 101; the axis of the fourth shaft 105 coincides with the axis of the first shaft 7. It can be understood that the opposite ends of the fourth shaft 105 are respectively connected to the third planetary carrier 63 of the third planetary mechanism 6 and the differential gear of the vehicle half shaft 101; the differential gear is also a bevel gear 106. In this embodiment, the first shaft 7, the second shaft 8, the third shaft 9 and the fourth shaft 105 are all coaxially arranged, and the drive system realizes a longitudinal arrangement, and there are no additional components in the transverse direction, thereby improving the compactness of the power drive system and reducing the occupied space of the power drive system.

[0047] An embodiment of the present invention further provides a power driving method, which is applied to the above-mentioned power driving system; the power driving method comprises: The remaining power of the vehicle battery is obtained, a target driving element is determined according to the remaining power, and the wheels are driven to rotate through a preset driving path including the target driving element; the target driving element is at least one of the engine 1, the generator 2 and the drive motor 3. It can be understood that the remaining power of the vehicle battery can be detected in real time by a power detection sensor on the vehicle, and the target driving element drives the wheels to rotate through the preset path.

[0048] In the power drive method of the above embodiment of the present invention, the first shaft 7, the second shaft 8 and the third shaft 9 of the power drive system are coaxially arranged, so that the engine 1, the first planetary mechanism 4, the generator 2, the second planetary mechanism 5, the drive motor 3 and the third planetary mechanism 6 are arranged longitudinally along the same axis, and no additional components need to be arranged in the transverse direction, thereby improving the compactness of the power drive system and reducing the occupied space of the power drive system; and, when the vehicle battery has different remaining powers, different target drive elements can be determined to drive the wheels to rotate along a preset drive path, thereby ensuring the driving performance of the vehicle under different remaining powers.

[0049] In one embodiment, determining a target driving element according to the remaining power, and driving the wheel to rotate by the target driving element along a preset driving path includes: When the remaining power is greater than or equal to the first preset power, the target driving element is determined to be the driving motor 3; the preset driving path includes the driving motor 3, the third planetary mechanism 6 and the vehicle half shaft. It can be understood that the first preset power can be set according to actual needs. When the remaining power of the vehicle battery is greater than or equal to the first preset power, it indicates that the vehicle battery has sufficient power. At this time, the driving system can select the single-motor pure electric driving mode, and the driving motor 3 drives the wheels to rotate in sequence through the third planetary mechanism 6, the third shaft 9 and the vehicle half shaft 101.

[0050] In one embodiment, determining the target driving element according to the remaining power includes: When the remaining power is greater than the second preset power and less than the first preset power, the target drive element is determined from the engine 1, the generator 2 and the drive motor 3 according to the real-time speed of the vehicle; wherein the first preset power is greater than the second preset power. It can be understood that the second preset power can be set according to actual needs. When the remaining power of the vehicle battery is greater than the second preset power and less than the first preset power, it indicates that the remaining power of the vehicle battery is moderate. At this time, different drive modes can be selected according to the real-time speed of the vehicle. In the power drive method of the above embodiment of the present invention, when the remaining power is greater than the second preset power and less than the first preset power, if the real-time speed is different, different target drive elements can be determined to drive the wheels to rotate along the preset drive path, thereby ensuring the driving performance of the vehicle under different real-time speed conditions.

[0051] In one embodiment, the target driving element is determined from the engine 1, the generator 2 and the driving motor 3 according to the real-time vehicle speed, including: When it is detected that the real-time vehicle speed is greater than or equal to the preset vehicle speed, it is determined that the target driving element includes the engine 1 and the drive motor 3; the preset drive path includes a first path and a second path, the first path includes the engine 1, the first planetary mechanism 4, the first shaft 7, the second planetary mechanism 5, the third shaft 9, the third planetary mechanism 6 and the vehicle half shaft 101, and the first path includes the drive motor 3, the third planetary mechanism 6 and the vehicle half shaft 101. It can be understood that the preset vehicle speed can be set according to actual needs, and the real-time vehicle speed is greater than or equal to the preset vehicle speed, indicating that the vehicle is in a high-speed area. When the battery power is moderate and the real-time vehicle speed is in a high-speed state, the power drive system is in a parallel first gear mode or a parallel second gear mode, the engine 1 drives the wheels to rotate through the first planetary mechanism 4, the first shaft 7, the second planetary mechanism 5, the third shaft 9, the third planetary mechanism 6 and the vehicle half shaft 101 in sequence, and the drive motor 3 drives the wheels to rotate through the third planetary mechanism 6 and the third shaft 9 in sequence. At this time, the power drive system has good economy and power.

[0052] In one embodiment, the target driving element is determined from the engine 1, the generator 2 and the driving motor 3 according to the real-time vehicle speed, including: When it is detected that the real-time vehicle speed is less than the preset vehicle speed, if the power demand of the vehicle is greater than or equal to the preset power, the engine 1 is controlled to drive the generator 2 to rotate, so as to generate electricity for the vehicle battery through the preset power generation path, and the target drive element is determined to include the drive motor 3; the preset drive path includes the drive motor 3, the third planetary mechanism 6 and the vehicle half shaft; the power generation path includes the engine 1, the first planetary mechanism 4, the first shaft 7 and the generator 2. In the power driving method of the above embodiment of the present invention, when the remaining power is greater than the second preset power and less than the first preset power, if the real-time vehicle speed is less than the preset speed, different target drive elements can be determined according to different power demands to drive the wheels to rotate according to the preset drive path. It can be understood that the preset power can be set according to actual needs. When the power demand is greater than or equal to the preset power, it indicates that the power demand of the vehicle is large; when the real-time vehicle speed is less than the preset speed, it indicates that the vehicle is in a low-speed area. When the battery power is moderate, the vehicle is in a low-speed area, and the power demand is large, the power drive system is in a series extended-range mode, and the engine 1 drives the generator 2 to rotate through the first planetary mechanism 4 and the first shaft 7 in sequence, and the generator 2 generates electricity and charges the vehicle battery; the drive motor 3 drives the wheels to rotate through the third shaft 9 and the third planetary mechanism 6 in sequence. At this time, the engine 1 operates in the optimal efficiency area, the current generated by the generator 2 charges the vehicle battery, and the vehicle battery drives the wheels to rotate through the drive motor 3.

[0053] In one embodiment, the target driving element is determined from the engine 1, the generator 2 and the driving motor 3 according to the real-time vehicle speed, including: When it is detected that the real-time vehicle speed is less than the preset vehicle speed, if the vehicle's power demand is less than the preset power, it is determined that the target drive element includes the drive motor 3; the preset drive path includes the drive motor 3, the third planetary mechanism 6 and the vehicle half-axle. It can be understood that when the power demand is less than the preset power, it indicates that the vehicle's power demand is small. When the battery power is moderate, the vehicle is in a low-speed area, and the power demand is small, the power drive system is in a single-motor pure electric drive mode, and the drive motor 3 drives the wheels to rotate sequentially through the third planetary mechanism 6 and the third shaft 9, thereby improving the NVH performance of the entire vehicle.

[0054] In one embodiment, determining a target driving element according to the remaining power, and driving the wheel to rotate by the target driving element along a preset driving path includes: When the remaining power is less than or equal to the second preset power, the engine 1 is controlled to drive the generator 2 to rotate, so as to generate power for the vehicle battery through the preset power generation path, and at the same time, the target driving element is determined to be the drive motor 3, and the wheels are driven to rotate through the third preset drive path; the third preset drive path includes the drive motor 3, the third planetary mechanism 6 and the vehicle half shaft; the power generation path includes the engine 1, the first planetary mechanism 4, the first shaft 7 and the generator 2. It can be understood that when the remaining power of the vehicle battery is less than or equal to the second preset power, it indicates that the power of the vehicle battery is low. At this time, the engine 1 can drive the generator 2 to rotate through the first planetary mechanism 4 and the first shaft 7 in sequence, and the generator 2 generates power and charges the vehicle battery. The drive motor 3 drives the wheels to rotate through the third planetary mechanism 6, the third shaft 9 and the vehicle half shaft 101 in sequence.

[0055] In the power drive method of the above embodiment of the present invention, the first shaft 7, the second shaft 8 and the third shaft 9 of the power drive system are coaxially arranged, so that the engine 1, the first planetary mechanism 4, the generator 2, the second planetary mechanism 5, the drive motor 3 and the third planetary mechanism 6 are arranged longitudinally along the same axis, and no additional components need to be arranged in the transverse direction, thereby improving the compactness of the power drive system and reducing the occupied space of the power drive system; and, under different conditions of remaining power, real-time vehicle speed and power demand, different target drive elements can be determined to drive the wheels to rotate along a preset drive path, thereby ensuring the performance of the vehicle under different driving conditions.

[0056] For further analysis, the following figure is a schematic diagram of vehicle mode calibration under the dimensions of vehicle remaining power and real-time vehicle speed. Curve 1, curve 2, curve 3 and curve 4 represent four calibration parameters respectively.

[0057] Curve 1----Parallel first gear, parallel second gear and extended-range mode upper limit start-stop line. The remaining power value of the vehicle battery in Curve 1 determines the timing of engine starting at different real-time vehicle speeds, and economic factors such as pure electric driving range must be considered.

[0058] Curve 2: The speed threshold for entering and exiting the engine direct drive / parallel first gear mode. This speed threshold is related to the power demand of the vehicle. The speed threshold for entering the parallel first gear mode should mainly consider the power of the vehicle. In order to obtain the best power performance, the higher the real-time speed is when entering the parallel first gear mode. The calibration of the speed threshold for exiting the parallel first gear mode should consider the following two factors: On the one hand, when the battery is high, the real-time speed of exiting the parallel first gear mode under the power demand of each vehicle is close through calibration, which can avoid frequent mode switching when the accelerator is released, and meet the comfort requirements of the vehicle; on the other hand, when the remaining battery power is low, the real-time speed needs to be calibrated larger under high power demand, so that it can exit from the parallel mode to the extended-range mode, meeting the driver's overtaking acceleration needs.

[0059] Curve 3----The speed threshold for entering and exiting the second gear of the engine direct drive / parallel mode. The speed threshold is related to the power demand. The speed threshold for entering the parallel second gear mode should be calibrated mainly to consider the economy of the whole vehicle, in order to obtain the best economy. The calibration of the speed threshold for exiting the parallel second gear mode should consider the following two factors: On the one hand, when the remaining power of the vehicle is high, the real-time vehicle speed for exiting the parallel second gear mode under various power demands is close through calibration, which can avoid frequent mode switching when the accelerator is released, and meet the comfort requirements of the whole vehicle; On the other hand, when the remaining power of the vehicle is low, the real-time vehicle speed needs to be calibrated larger when the power demand is large, so that it can exit from the parallel second gear mode to the first gear or the extended range mode, and meet the driver's overtaking acceleration needs.

[0060] Curve 4----the lower limit threshold of the remaining power in the hybrid mode. Curve 4 is the dividing line of the remaining power in the parallel first mode, parallel second gear mode and extended range mode. When the remaining power is low, the vehicle will actively limit the battery output power. Therefore, the calibration mainly needs to consider the power of the whole vehicle, especially the power demand under some extreme experimental conditions.

[0061] An embodiment of the present invention further provides a controller for executing the above-mentioned power drive method. For the specific definition of the controller, please refer to the definition of the power drive method above, which will not be repeated here. Each module in the above-mentioned controller can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0062] An embodiment of the present invention further provides a vehicle, comprising the above-mentioned power drive system. In the vehicle of the above-mentioned embodiment of the present invention, the engine 1 is connected to the first planetary mechanism 4, the first planetary mechanism 4 is connected to the first end of the generator 2 through the first shaft 7, the second end of the generator 2 is connected to the second planetary mechanism through the second shaft 8, the second planetary mechanism 5 is connected to the third planetary mechanism 6 through the third shaft 9, the drive motor 3 is connected to the third planetary mechanism 6, and the third planetary mechanism 6 is connected to the vehicle half shaft 101; the first shaft 7, the second shaft 8 and the third shaft 9 are coaxially arranged, so that the engine 1, the first planetary mechanism 4, the generator 2, the second planetary mechanism 5, the drive motor 3 and the third planetary mechanism 6 are arranged longitudinally along the same axis, and no additional components need to be arranged in the transverse direction, thereby improving the compactness of the power drive system and reducing the occupied space of the power drive system.

[0063] An embodiment of the present invention further provides a vehicle, comprising the above-mentioned controller. In the vehicle of the above-mentioned embodiment of the present invention, the first shaft 7, the second shaft 8 and the third shaft 9 of the power drive system are coaxially arranged, so that the engine 1, the first planetary mechanism 4, the generator 2, the second planetary mechanism 5, the drive motor 3 and the third planetary mechanism 6 are arranged longitudinally along the same axis, and no additional parts need to be arranged in the transverse direction, thereby improving the compactness of the power drive system and reducing the occupied space of the power drive system. In addition, under different conditions of remaining power, real-time vehicle speed and power requirements, different target drive elements can be determined to drive the wheels to rotate in a preset drive path, thereby ensuring the performance of the vehicle under different driving conditions.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power drive system, characterized in that: It includes an engine, a generator, a drive motor, a first planetary mechanism, a second planetary mechanism, a third planetary mechanism, a first shaft, a second shaft and a third shaft; The engine is connected to the first planetary mechanism, the first planetary mechanism is connected to the first end of the generator through the first shaft, the second end of the generator is connected to the second planetary mechanism through the second shaft, the second planetary mechanism is connected to the third planetary mechanism through the third shaft, and the drive motor is connected to the vehicle half shaft through the third planetary mechanism; the first shaft, the second shaft and the third shaft are coaxially arranged.

2. The power drive system according to claim 1, characterized in that: The first planetary mechanism comprises a first sun gear, a first planet gear, a first planet carrier and a first ring gear; the first planet gear is mounted on the first planet carrier and meshes with the first sun gear, and the first ring gear meshes with the first planet gear; The engine is connected to the first planet carrier, and one end of the first shaft away from the generator is connected to the first sun gear.

3. The power drive system according to claim 1, characterized in that: The second planetary mechanism includes a second sun gear, a second planetary gear, a second planet carrier and a second ring gear; the second planetary gear is mounted on the second planet carrier and meshes with the second sun gear, and the second ring gear meshes with the second planetary gear; the end of the second shaft away from the generator is connected to the second ring gear, and the end of the third shaft away from the third planetary mechanism is connected to the second planet carrier.

4. The power drive system according to claim 3, characterized in that: The power drive system further comprises a brake and a clutch, wherein the brake is connected to the second sun gear; The clutch comprises a first clutch hub and a second clutch hub which are arranged opposite to each other, wherein the first clutch hub is connected to the second ring gear, and the second clutch hub is connected to the second sun gear or the second planet carrier; and an end of the second shaft away from the generator is connected to the first clutch hub.

5. The power drive system according to claim 3, characterized in that: The third planetary mechanism comprises a third sun gear, a third planetary gear, a third planet carrier and a third ring gear; the drive motor is connected to the third sun gear, the third planetary gear is mounted on the third planet carrier and meshes with the third sun gear, and the third ring gear meshes with the third planetary gear; The opposite ends of the third shaft are respectively connected to the second planet carrier and the third planet carrier, and the third planet carrier is connected to the vehicle half shaft.

6. The power drive system according to claim 3, characterized in that: The power drive system has a series range-extending mode: the brake and the clutch are both disengaged, the engine drives the generator to rotate through the first planetary mechanism and the first shaft in sequence, the generator generates electricity and stores the electrical energy in the vehicle battery; the power of the drive motor is transmitted to the vehicle half-axle through the third planetary mechanism.

7. A power driving method, characterized in that: The power drive is applied to the power drive system according to any one of claims 1 to 6; the power drive method comprises: The remaining power of the vehicle battery is obtained, a target drive element is determined according to the remaining power, and the wheels are driven to rotate through a preset drive path including the target drive element; the target drive element is at least one of the engine, the generator and the drive motor.

8. The driving method according to claim 7, characterized in that: The step of determining a target driving element according to the remaining power, and driving the wheel to rotate along a preset driving path by the target driving element, comprises: When the remaining power is greater than or equal to a first preset power, the target driving element is determined to be the driving motor; and the preset driving path includes the driving motor, the third planetary mechanism and the vehicle half-axle.

9. The driving method according to claim 8, characterized in that: The step of determining a target driving element according to the remaining power comprises: When the remaining power is greater than a second preset power and less than the first preset power, a target drive element is determined from the engine, the generator and the drive motor according to the real-time speed of the vehicle; wherein the first preset power is greater than the second preset power.

10. The driving method according to claim 9, characterized in that: The step of determining a target driving element from among the engine, the generator, and the driving motor according to the real-time vehicle speed of the vehicle includes: When it is detected that the real-time vehicle speed is greater than or equal to the preset vehicle speed, it is determined that the target driving element includes the engine and the driving motor; the preset driving path includes a first path and a second path, the first path includes the engine, the first planetary mechanism, the first shaft, the second planetary mechanism, the third shaft, the third planetary mechanism and the vehicle half-axle; the second path includes the driving motor, the third planetary mechanism and the vehicle half-axle.

11. The driving method according to claim 9, characterized in that: The step of determining a target driving element from among the engine, the generator, and the driving motor according to the real-time vehicle speed of the vehicle includes: When it is detected that the real-time vehicle speed is less than the preset vehicle speed, if the power demand of the vehicle is greater than or equal to the preset power, the engine is controlled to drive the generator to rotate so as to generate electricity for the vehicle battery through a preset power generation path, and it is determined that the target drive element includes the drive motor; the preset drive path includes the drive motor, the third planetary mechanism and the vehicle half shaft; the power generation path includes the engine, the first planetary mechanism, the first shaft and the generator.

12. The driving method according to claim 9, characterized in that: The step of determining a target driving element from among the engine, the generator, and the driving motor according to the real-time vehicle speed of the vehicle includes: When it is detected that the real-time vehicle speed is less than the preset vehicle speed, if the power demand of the vehicle is less than the preset power, it is determined that the target driving element includes the driving motor; the preset driving path includes the driving motor, the third planetary mechanism and the vehicle half shaft.

13. The driving method according to claim 7, characterized in that: The step of determining a target driving element according to the remaining power, and driving the wheel to rotate along a preset driving path by the target driving element, comprises: When the remaining power is less than or equal to the second preset power, the engine is controlled to drive the generator to rotate, so as to generate electricity for the vehicle battery through a preset power generation path, and at the same time, the target driving element is determined to be the drive motor, and the wheels are driven to rotate through a third preset drive path; the third preset drive path includes the drive motor, the third planetary mechanism and the vehicle half-axle; the power generation path includes the engine, the first planetary mechanism, the first shaft and the generator.

14. A controller, characterized in that: Used to execute the power driving method according to any one of claims 7 to 13.

15. A vehicle, characterized in that: Includes the power drive system as described in any one of claims 1 to 6, or includes the controller as described in claim 14.

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