Hybrid power system, control method and vehicle

Abstract

The invention discloses a hybrid power system and a control method thereof and a vehicle, and relates to the technical field of vehicle hybrid power, the hybrid power system comprises a power output shaft, a first planet row, a power module, a clutch module and a control module, the first planet row comprises a first sun gear, a first planet carrier and a first gear ring, and the first gear ring is in transmission connection with the power output shaft; the power module comprises an engine, a first driving motor and a second driving motor, the engine is provided with an engine output shaft, the engine output shaft and the power output shaft are coaxially arranged, the engine output shaft is fixedly connected with the first planet carrier, and the first driving motor is in transmission connection with the first sun gear through a first transmission shaft; the second driving motor is in transmission connection with the power output shaft through the transmission speed reducing mechanism, the clutch module comprises a first clutch arranged between the engine output shaft and the first transmission shaft and used for selectively controlling connection and disconnection between the engine output shaft and the first transmission shaft, and the control module is electrically connected with the power module and the clutch module.

Description

Technical Field

[0001] The present invention relates to the field of vehicle hybrid technology, and in particular to a hybrid system and a control method thereof, and a vehicle. Background Art

[0002] With the increasing penetration of new energy vehicles in the passenger car market, new energy off-road vehicles are becoming increasingly popular. Because off-road vehicles require both high wheel-end peak torque for climbing extreme grades and low speed ratios for high-speed cruising, there are two main technical approaches for new energy off-road vehicles: First, a single- or two-speed DHT (Dedicated Hybrid Trans Mission) transmission is used, where the engine is used for high-speed cruising and the motor is used for low-speed, high-torque scenarios. For example, during starting or low-speed phases, dual motors are used in series and parallel to drive the vehicle, which is not conducive to escape and stall conditions. Second, a traditional fuel vehicle's multi-speed transmission is used in combination with a P2 motor to achieve superior off-road performance. However, the transmission is complex and large in size, resulting in a significant reduction in power performance after power is supplied, and there is shifting jerk. Summary of the Invention

[0003] The main purpose of the present invention is to propose a hybrid system and its control method and vehicle, aiming to solve the problems of insufficient low-speed performance or complex gearbox structure and jerky shifting in existing new energy off-road vehicles.

[0004] To achieve the above objectives, the hybrid system proposed in the present invention includes:

[0005] Power take-off shaft;

[0006] a first planetary gear set, coaxially arranged with the power output shaft, comprising a first sun gear, a first planet carrier and a first ring gear, wherein the first ring gear is drivingly connected to the power output shaft;

[0007] A power module includes an engine, a first drive motor, and a second drive motor, wherein the engine has an engine output shaft, the engine output shaft is coaxially arranged with the power output shaft and fixedly connected to the first planetary carrier, the first drive motor is transmission-connected to the first sun gear via a first transmission shaft, and the second drive motor is transmission-connected to the power output shaft via a transmission reduction mechanism; and

[0008] a clutch module, comprising a first clutch provided between the engine output shaft and the first transmission shaft, for selectively controlling the connection and disconnection between the engine output shaft and the first transmission shaft; and

[0009] The control module is electrically connected to the power module and the clutch module.

[0010] In one embodiment, the transmission reduction mechanism includes:

[0011] a second transmission shaft, sleeved on the power output shaft and extending along the axial direction of the power output shaft; and

[0012] a second planetary gear, comprising a second sun gear, a second planet carrier, and a second ring gear, wherein the second sun gear is sleeved on the power output shaft and fixedly connected to the second transmission shaft, the second planet carrier is fixedly connected to the power output shaft, and the second ring gear is fixedly connected to the housing;

[0013] Wherein, the second driving motor is drivingly connected to the second transmission shaft.

[0014] In one embodiment, the rotor of the second drive motor is sleeved on the power output shaft and fixedly connected to the second transmission shaft.

[0015] In one embodiment, the transmission reduction mechanism includes:

[0016] a second transmission shaft, disposed between the engine output shaft and the power output shaft, and coaxially arranged with the power output shaft;

[0017] a third transmission shaft extending in the axial direction of the power output shaft and spaced apart from the second transmission shaft in the radial direction of the power output shaft; and

[0018] The first transmission structure includes a first transmission gear set and a second transmission gear set, wherein the first transmission gear set is arranged between the second transmission shaft and the third transmission shaft, and the second transmission gear set is arranged between the third transmission shaft and the power output shaft.

[0019] In one embodiment, two first transmission gear sets are provided, and the transmission ratios of the two first transmission gear sets are different;

[0020] The clutch module further includes a second clutch fixed to the second transmission shaft, for selectively controlling the engagement and disengagement of one of the two first transmission gear sets with the second transmission shaft.

[0021] In one embodiment, the clutch module further includes a third clutch provided between the first ring gear and the power output shaft, for selectively controlling the connection and disconnection between the first ring gear and the power output shaft.

[0022] In one embodiment, the hybrid system further comprises a first brake provided on the engine output shaft for selectively locking the engine output shaft.

[0023] In one embodiment, the hybrid system further includes a torque limiting damper provided on the engine output shaft.

[0024] In addition, the present invention further provides a vehicle, comprising the above-mentioned hybrid system, wherein the hybrid system comprises:

[0025] Power take-off shaft;

[0026] a first planetary gear set, coaxially arranged with the power output shaft, comprising a first sun gear, a first planet carrier and a first ring gear, wherein the first ring gear is drivingly connected to the power output shaft;

[0027] A power module includes an engine, a first drive motor, and a second drive motor, wherein the engine has an engine output shaft, the engine output shaft is coaxially arranged with the power output shaft and fixedly connected to the first planetary carrier, the first drive motor is transmission-connected to the first sun gear via a first transmission shaft, and the second drive motor is transmission-connected to the power output shaft via a transmission reduction mechanism;

[0028] a clutch module, comprising a first clutch provided between the engine output shaft and the first transmission shaft, for selectively controlling the connection and disconnection between the engine output shaft and the first transmission shaft; and

[0029] The control module is electrically connected to the power module and the clutch module.

[0030] The present invention further provides a control method for a hybrid system, based on the above-mentioned hybrid system, the hybrid system includes: a power output shaft; a first planetary gear set coaxially with the power output shaft, the first planetary gear set including a first sun gear, a first planetary carrier and a first ring gear, the first ring gear being transmission-connected to the power output shaft; a power module including an engine, a first drive motor and a second drive motor, the engine having an engine output shaft, the engine output shaft being coaxially arranged with the power output shaft and fixedly connected to the first planetary carrier, the first drive motor being transmission-connected to the first sun gear via a first transmission shaft, and the second drive motor being transmission-connected to the power output shaft via a transmission reduction mechanism; and a clutch module including a first clutch provided between the engine output shaft and the first transmission shaft, for selectively controlling the connection and disconnection between the engine output shaft and the first transmission shaft; and a control module electrically connecting the power module and the clutch module;

[0031] The control method of the hybrid system comprises the following steps:

[0032] Get the type of power output mode;

[0033] According to the type of the power output mode, the power module and the clutch module are controlled to operate.

[0034] In the technical solution of the present invention, the power output shaft is provided to drive the vehicle, the first planetary gear is provided to connect the engine output shaft and / or the first drive motor with the power output shaft, so that the torque of the engine and / or the first drive motor can be transmitted to the power output shaft, the transmission reduction mechanism is provided to connect the second drive motor with the power output shaft, so that the torque of the second drive motor can be transmitted to the power output shaft, and the clutch module is provided to control the on and off of the engine output shaft and the first transmission shaft, so as to control the connection between the engine output shaft and the power output shaft. In this way, the control module is provided to control the power module and the clutch module. block, so that the engine and / or the first drive motor and / or the second drive motor can drive the vehicle, the power output shaft is coaxially arranged with the first planetary gear and the engine output shaft, so as to reduce the radial size of the hybrid system. At the same time, by arranging the first planetary gear, on the one hand, the engine can intervene in the drive at low speed to avoid the motor from being blocked, which is helpful for the vehicle to get out of trouble or climb a slope; on the other hand, a power split mode can be adopted when feeding power or shifting gears, which can not only ensure smooth shifting and reduce the risk of the hybrid system being jerked, but also improve the overall power economy of the vehicle under the premise of ensuring vehicle power, thereby solving the problems of insufficient low-speed performance or complex gearbox structure and jerking in gear shifting of existing new energy off-road vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0036] Figure 1 A schematic structural diagram of an embodiment of a hybrid system provided by the present invention;

[0037] Figure 2 A schematic structural diagram of another embodiment of the hybrid system provided by the present invention;

[0038] Figure 3 A schematic diagram of the structure of a control module of a hardware operating environment involved in an embodiment of the present invention;

[0039] Figure 4This is a flow chart of a first embodiment of a method for controlling a power system provided by the present invention.

[0040] Description of Figure Numbers:

[0041] 100. Hybrid system;

[0042] 1. Power output shaft;

[0043] 2. First planetary gear; 21. First sun gear; 22. First planetary carrier; 23. First ring gear;

[0044] 31. Engine; 311. Engine output shaft; 32. First drive motor; 33. Second drive motor; 34. First transmission shaft;

[0045] 41. Second transmission shaft; 42. Third transmission shaft; 43. First transmission structure; 431. First transmission gear set; 432. Second transmission gear set; 44. Second planetary gear set; 441. Second sun gear; 442. Second planetary carrier; 443. Second ring gear;

[0046] 5. Clutch module; 51. First clutch; 52. Second clutch; 53. Third clutch;

[0047] 6. First brake; 7. Torque limiting shock absorber.

[0048] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] With the increasing penetration of new energy vehicles in the passenger car market, new energy off-road vehicles are becoming increasingly popular. Because off-road vehicles require both high wheel-end peak torque for climbing extreme grades and low speed ratios for high-speed cruising, there are two main technical approaches for new energy off-road vehicles: First, a single- or two-speed DHT (Dedicated Hybrid Trans Mission) transmission is used, where the engine is used for high-speed cruising and the motor is used for low-speed, high-torque scenarios. For example, during starting or low-speed phases, dual motors are used in series and parallel to drive the vehicle, which is not conducive to escape and stall conditions. Second, a traditional fuel vehicle's multi-speed transmission is used in combination with a P2 motor to achieve superior off-road performance. However, the transmission is complex and large in size, resulting in a significant reduction in power performance after power is supplied, and there is shifting jerk.

[0053] Based on this, the present invention proposes a hybrid system to solve the problems of insufficient low-speed performance or complex gearbox structure and jerky shifting in existing new energy off-road vehicles. Figure 1 and Figure 2 A schematic structural diagram of the hybrid system provided by the present invention; Figure 3 A schematic diagram of the structure of a control module of a hardware operating environment involved in an embodiment of the invention; Figure 4 This is a flow chart of the control method of the hybrid system provided by the present invention.

[0054] See also Figure 1 and Figure 2In one embodiment of the present invention, the hybrid system 100 includes a power output shaft 1, a first planetary gear 2, a power module, a clutch module 5, and a control module. The first planetary gear 2 is coaxially arranged with the power output shaft 1. The first planetary gear 2 includes a first sun gear 21, a first planetary carrier 22, and a first ring gear 23. The first ring gear 23 is transmission-connected to the power output shaft 1. The power module includes an engine 31, a first drive motor 32, and a second drive motor 33. The engine 31 has an engine output shaft 311, and the engine output shaft 311 is connected to the The power output shaft 1 is coaxially arranged and fixedly connected to the first planetary carrier 22. The first drive motor 32 is connected to the first sun gear 21 through the first transmission shaft 34. The second drive motor 33 is connected to the power output shaft 1 through a transmission reduction mechanism. The clutch module 5 includes a first clutch 51 arranged between the engine output shaft 311 and the first transmission shaft 34, which is used to selectively control the connection and disconnection between the engine output shaft 311 and the first transmission shaft 34. The control module is electrically connected to the power module and the clutch module 5.

[0055] The power output shaft 1 is used to connect the wheel end to transmit the power of the engine 31 and / or the first drive motor 32 to the wheels in order to drive the vehicle. There are many ways to set it up. It can be set along the front and rear directions of the vehicle, that is, the length direction of the vehicle, or it can be set along the left and right directions of the vehicle, that is, the width direction of the vehicle. The present invention does not limit this.

[0056] The first planetary gear set 2 is coaxially arranged with the power take-off shaft 1, meaning that the rotation center of the planetary gear set is aligned with the rotation center of the power take-off shaft 1, which helps reduce the radial dimension of the hybrid system 100 in the power take-off shaft 1. The engine output shaft 311 is coaxially arranged with the power take-off shaft 1, meaning that the center of the engine output shaft 311 is aligned with the center of the power take-off shaft 1. The engine output shaft 311 is fixedly connected to the first planetary carrier 22, enabling synchronous rotation of the first planetary carrier 22 and the engine output shaft 311. The first drive motor 32 is connected to the first sun gear 21 via the first transmission shaft 34, allowing the torque of the first drive motor 32 to be transmitted to the first ring gear 23 via the first transmission shaft 34 and the first sun gear 21. This allows the first drive motor 32 to output power through the first planetary gear set 2, making the drive motor suitable for low-speed scenarios such as starting. The second drive motor 33 is connected to the power output shaft 1 through a transmission reduction mechanism, so that the torque of the second drive motor 33 can be directly output to the power output shaft 1 through the transmission reduction mechanism, so that the second drive motor 33 can drive the vehicle.

[0057] When the first clutch 51 moves to the left, the engine output shaft 311 engages with the first transmission shaft 34, connecting them and thus connecting the first sun gear 21 to the first planetary carrier 22. When the first clutch 51 is in the middle, the engine output shaft 311 disengages from the first transmission shaft 34, disconnecting them from each other and enabling the first sun gear 21 and the first planetary carrier 22 to operate independently. When the first clutch 51 is in the right, the first transmission shaft 34 engages with the hybrid transmission housing to lock the first transmission shaft 34. Furthermore, the first clutch 51 may be a double-sided synchronizer or two single-sided synchronizers, etc., which are not limited in the present invention.

[0058] In the technical solution of the present invention, the power output shaft 1 is provided to drive the vehicle, the first planetary gear 2 is provided to connect the engine output shaft 311 and / or the first drive motor 32 to the power output shaft 1, so that the torque of the engine 31 and / or the first drive motor 32 can be transmitted to the power output shaft 1, the transmission reduction mechanism is provided to connect the second drive motor 33 to the power output shaft 1, so that the torque of the second drive motor 33 can be transmitted to the power output shaft 1, and the clutch module 5 is provided to control the on and off of the engine output shaft 311 and the first transmission shaft 34, so as to control the connection between the engine output shaft 311 and the power output shaft 1. In this way, the control module is provided to control the power module and the The clutch module 5 is configured to enable the engine 31 and / or the first drive motor 32 and / or the second drive motor 33 to drive the vehicle. The power output shaft 1 is coaxially arranged with the first planetary gear set 2 and the engine output shaft 311 to reduce the radial size of the hybrid system 100. At the same time, by providing the first planetary gear set 2, on the one hand, the engine 31 can intervene in the drive at low speed to avoid motor stalling, which helps the vehicle to get out of trouble or climb a slope. On the other hand, a power splitting method can be adopted when feeding power or shifting gears, which can not only ensure smooth shifting and reduce the risk of jerking of the hybrid system 100, but also improve the overall power economy of the vehicle while ensuring vehicle power, thereby solving the problems of insufficient low-speed performance or complex gearbox structure and jerking of gear shifting in existing new energy off-road vehicles.

[0059] There are many types of transmission and reduction mechanisms. Specifically, in one embodiment of the present invention, please refer to Figure 2The transmission reduction mechanism includes a second transmission shaft 41 and a second planetary row 44. The second transmission shaft 41 is sleeved on the power output shaft 1 and extends along the axial direction of the power output shaft 1. The second planetary row 44 includes a second sun gear 441, a second planetary carrier 442 and a second ring gear 443. The second sun gear 441 is sleeved on the power output shaft 1 and is fixedly connected to the second transmission shaft 41. The second planetary carrier 442 is fixedly connected to the power output shaft 1. The second ring gear 443 is fixedly connected to the housing. The second drive motor 33 drives the second drive motor 33 connected to the second drive motor 33. Second transmission shaft 41, thus, by setting the second transmission shaft 41 to connect the second drive motor 33 with the second sun gear 441, and by setting the second planetary gear 44 structure, the fourth transmission shaft can be connected to the power output shaft 1, so that the torque of the second drive motor 33 can be transmitted to the power output shaft 11 through the fourth transmission shaft and the second sun gear 441, so that the two drive motors can drive the vehicle, and can be coaxially arranged with the power output shaft 1, which helps to reduce the size of the hybrid system 100 in the radial direction along the power output shaft 1.

[0060] Furthermore, there are multiple ways of driving and connecting the second transmission shaft 41 to the second drive motor 33. The second transmission shaft 41 can be directly connected to the main shaft of the second drive motor 33, or can be indirectly connected to the main shaft of the second drive motor 33 through a transmission structure. The present invention is not limited to this. Specifically, in this embodiment, the rotor of the second drive motor 33 is sleeved on the power output shaft 1 and fixedly connected to the second transmission shaft 41. In this way, the second transmission shaft 41 is fixedly connected to the rotor of the second drive motor 33, so that the second transmission shaft 41 can rotate synchronously with the rotor of the second drive motor 33, so that the second drive motor 33 can drive the third sun gear to rotate through the second transmission shaft 41, and the second drive motor 33 can be arranged along the axial direction of the power output shaft 1, thereby helping to reduce the radial size of the hybrid system 100 along the power output shaft 1.

[0061] In another embodiment of the present invention, see Figure 1The transmission reduction mechanism includes a second transmission shaft 41, a third transmission shaft 42 and a first transmission structure 43. The second transmission shaft 41 is arranged between the engine output shaft 311 and the power output shaft 1 and is coaxial with the power output shaft 1. The third transmission shaft 42 extends along the axial direction of the power output shaft 1 and is spaced apart from the second transmission shaft 41 in the radial direction of the power output shaft 1. The first transmission structure 43 includes a first transmission gear set 431 and a second transmission gear set 432. The first transmission gear set 431 is arranged between the second transmission shaft 41 and the third transmission shaft 42, and the second transmission gear set 432 is arranged on the third transmission shaft. 42 and the power output shaft 1, so that the second transmission shaft 41 is set to be connected to the first ring gear 23, and the third transmission shaft 42 is set to set the first transmission gear set 431 and the second transmission gear set 432, and at the same time, the first transmission gear set 431 is set to connect the second transmission shaft 41 with the third transmission shaft 42, so that the torque of the second transmission shaft 41 can be transmitted to the third transmission shaft 42, and the second transmission gear set 432 is set to connect the third transmission shaft 42 with the power output shaft 1, so that the torque of the third transmission shaft 42 can be transmitted to the power output shaft 1.

[0062] It should be noted that each of the first transmission gear set 431 and the second transmission gear set 432 includes two intermeshing transmission gears. In the first transmission gear set 431, one of the two transmission gears is mounted on the second transmission shaft 41, and the other is mounted on the third transmission shaft 42. In the second transmission gear set 432, one of the two transmission gears is mounted on the third transmission shaft 42, and the other is mounted on the power output shaft 1. Furthermore, the transmission ratio of the first transmission gear set 431 and the transmission ratio of the second transmission gear set 432 may be the same or different, and the present invention is not limited thereto. Specifically, in this embodiment, the transmission ratios of the first transmission gear set 431 and the second transmission gear set 432 are different. By adopting different transmission ratios, the total transmission ratio of the first transmission gear set 431 and the second transmission gear set 432 can meet the driving requirements of the vehicle.

[0063] Furthermore, the number of the first transmission gear sets 431 can be various, and can be one, two, three, or four, etc., and the present invention does not limit this. Specifically, in this embodiment, two first transmission gear sets 431 are provided, and the transmission ratios of the two first transmission gear sets 431 are different. The clutch module 5 also includes a second clutch 52 fixed to the second transmission shaft 41, which is used to selectively control the engagement and disengagement of one of the two first transmission gear sets 431 with the second transmission shaft 41. When the second clutch 52 moves to the left side, the third clutch 53 couples with one of the two first transmission gear sets 431 to enable the second transmission shaft 41 to be connected to the third transmission shaft 42. When the second clutch 52 moves to the middle, the second clutch 52 separates from the two first transmission gear shafts to disconnect the second transmission shaft 41 from the third transmission shaft 42. When the second clutch 52 moves to the right, the third clutch 53 is coupled to the other of the two first transmission gear sets 431 to connect the second transmission shaft 41 to the third transmission shaft 42. In this way, by setting the activity of the second clutch 52, the second transmission shaft 41 can be connected to the third transmission shaft 421 through the two first transmission gear sets 431 respectively. At the same time, the transmission ratios of the two first transmission gear sets 431 are different, so that the hybrid system 100 can form two output gears, so that the engine 31 can be driven directly at both low and high gears, which is beneficial to expanding the output range of the engine 31, thereby helping to improve the power output performance of the hybrid system 100, so that the hybrid system 100 can be suitable for off-road vehicles.

[0064] There are many ways to connect the first gear ring 23 to the power output shaft 1. The first gear ring 23 can be in a transmission connection or in a selective transmission connection. However, if the first gear ring 23 is always connected to the power output shaft 1, when the second drive motor 33 is driven, the first gear ring 23 will be dragged to rotate at a high speed, which will reduce the transmission efficiency of the hybrid system 100 and easily generate noise. For this reason, in this embodiment, the clutch module 5 also includes a third clutch 53 provided between the first gear ring 23 and the power output shaft 1, which is used to selectively control the on and off between the first gear ring 23 and the power output shaft 1. When the third clutch 53 is connected, the first gear ring 23 can be transmitted to the power output shaft 1. The first ring gear 23 is dynamically connected to the power take-off shaft 1 so that the torque of the first ring gear 23 can be transmitted to the power take-off shaft 1. When the third clutch 53 is disengaged, the first ring gear 23 is disconnected from the power take-off shaft 1, and the torque of the first ring gear 23 cannot be transmitted to the power take-off shaft 1. In this way, the movement of the third clutch 53 allows the first ring gear 23 to be selectively connected to the power take-off shaft 1, so that it can be connected to the power take-off shaft 1 when the first ring gear 23 needs to output power, and disconnected from the power take-off shaft 1 when it does not need to output power. This can avoid affecting the second drive motor 33 driving the vehicle, and can also reduce the noise of the hybrid system 100, thereby helping to improve the NVH performance of the hybrid system 100. Furthermore, the third clutch 53 can be of various types, such as an electromagnetic dog clutch or a one-way clutch, and the present invention is not limited thereto. Specifically, in this embodiment, the third clutch 53 is a one-way clutch. In this way, the one-way clutch can control the connection and disconnection between the first ring gear 23 and the power output shaft 1, and can also automatically engage and disengage the third clutch 53 through the relative speed of the first ring gear 23 and the power output shaft 1 or the second transmission shaft 41, without actively controlling the activity of the third clutch 53, thereby helping to reduce the control difficulty of the hybrid system 100.

[0065] It should be noted that there are various ways of transmission connection between the first gear ring 23 and the power output shaft 1. In one embodiment, the first gear ring 23 is connected to the second transmission shaft 41 through the third clutch 53, and the second transmission shaft 41 is transmission connected to the power output shaft 1. For details, please refer to Figure 1 At this time, the third clutch 53 is used to control the engagement and disengagement of the first ring gear 23 and the second transmission shaft 41. In another embodiment, the first ring gear 23 is connected to the power output shaft 1 through the third clutch 53. For details, please refer to Figure 2At this time, the third clutch 53 is used to control the engagement and disengagement of the first ring gear 23 and the power output shaft 1.

[0066] In one embodiment of the present invention, the hybrid system 100 further includes a first brake 6 disposed on the engine output shaft 311 for selectively locking the engine output shaft 311. When the first brake 6 is engaged, the engine output shaft 311 engages with the hybrid transmission housing, locking the engine output shaft 311 and preventing rotation. When the first brake 6 is disengaged, the first engine output shaft 311 separates from the hybrid transmission housing, releasing the lock on the first and second planetary carriers 442, allowing the engine output shaft 311 to rotate synchronously. Thus, the first brake 6 is activated to control the engagement and disengagement of the engine output shaft 311 with the hybrid transmission housing, allowing power from the power output shaft 1 and / or the first drive motor 32 to be transmitted to the first ring gear 23, thereby allowing power from the power module to be transmitted to the power output shaft 1. Furthermore, the first brake 6 can be of various types, including an electromagnetic dog clutch, a one-way clutch, etc., which are not limited in the present invention. Specifically, in this embodiment, the first brake 6 is a one-way clutch. Thus, the one-way clutch enables the engine output shaft 311 to output torque and to be reversely locked without actively controlling the activity of the first brake 6, thereby helping to reduce the control difficulty of the hybrid system 100.

[0067] The power take-off shaft 1 can be arranged in a variety of ways. For example, the power take-off shaft 1 can be arranged along the left-right direction of the vehicle, or along the front-back direction of the vehicle, which is not limited by the present invention. Specifically, in this embodiment, the power take-off shaft 1 is arranged along the front-back direction of the vehicle body. Since the torque demand of off-road vehicles is relatively large, the engine 31 is relatively large. Therefore, the power take-off shaft 1 is arranged along the front-back direction of the vehicle body. This not only facilitates the placement of the large-sized engine 31 and reduces transmission losses, but also reduces the load on the front axle and improves the front-to-rear weight balance, thereby helping to enhance the stability of the hybrid system 100. It is understood that the front-to-rear direction of the vehicle refers to the length direction of the vehicle, where the front of the vehicle is the front and the rear of the vehicle is the rear; the left-to-right direction of the vehicle refers to the width direction of the vehicle.

[0068] In one embodiment of the present invention, the hybrid system 100 further includes a torque-limiting damper 7 provided on the engine output shaft 311. Thus, by providing the torque-limiting damper 7, on the one hand, the engine output shaft 311 can be prevented from being subjected to excessive torque (such as during rapid acceleration or high-load output of the motor), thereby avoiding overload damage to the engine output shaft 311. On the other hand, the torque-limiting damper 7 can absorb vibrations generated by torque fluctuations (such as engine 31 ignition shocks or motor start-stop), thereby reducing noise transmitted to the vehicle body and improving driving smoothness.

[0069] See also Figure 2 The hybrid system 100 provided by the present invention can generate a variety of operating modes, including series mode, pure electric drive mode, engine direct drive mode, driving power generation mode, and energy recovery mode. The operating modes of the hybrid system 100 will be described below based on the above embodiment and in conjunction with Table 1.

[0070] Table 1 Switching logic of each working mode of the hybrid system

[0071]

[0072] When the hybrid system 100 is in the first working mode, the engine 31 is working, the first drive motor 32 generates electricity, the second drive motor 33 drives, the first clutch 51 moves to the left, the engine output shaft 311 is combined with the first transmission shaft 34, so that the first planetary carrier 22 is connected to the first sun gear 21, the third clutch 53 is disconnected, the first ring gear 23 is separated from the power output shaft 1, so that the first ring gear 23 is disconnected from the power output shaft 1, the first brake 6 is disconnected, and the engine output shaft 311 is separated from the housing of the hybrid transmission. The first sun gear 21 and the first planetary carrier 22 are able to rotate synchronously. This mode is the first embodiment of the series mode. At this time, the engine 31 drives the first drive motor 32 to generate electricity, and the second drive motor 33 drives the vehicle. The transmission route of the hybrid system 100 is as follows: the driving force of the engine 31 is transmitted to the first drive motor 32 via the first transmission shaft 34. At the same time, the driving force of the second drive motor 33 is transmitted to the power output shaft 1 via the second sun gear 441 and the second planetary carrier 442.

[0073] When the hybrid system 100 is in the second operating mode, the engine 31 and the first drive motor 32 are stopped, the second drive motor 33 is driven, the first clutch 51 moves to the middle, the engine output shaft 311 is separated from the first transmission shaft 34, so that the first planetary carrier 22 is disconnected from the first sun gear 21, the third clutch 53 is disengaged, the first ring gear 23 is separated from the power output shaft 1, so that the first ring gear 23 is disconnected from the power output shaft 1, the first brake 6 is disengaged, and the engine output shaft 311 is separated from the housing of the hybrid transmission, so that the engine output shaft 311 can rotate. This mode is the electric drive first gear mode. At this time, the second drive motor 33 drives the vehicle. The transmission route of the hybrid system 100 is: the driving force of the second drive motor 33 is transmitted to the power output shaft 1 via the second sun gear 441 and the second planetary carrier 442.

[0074] When the hybrid system 100 is in the third operating mode, the engine 31 is stopped, the first drive motor 32 and the second drive motor 33 are driven, the first clutch 51 is moved to the middle position, the engine output shaft 311 is separated from the first transmission shaft 34, and the first planetary carrier 22 is disconnected from the first sun gear 21. The third clutch 53 is closed, the first ring gear 23 is engaged with the power output shaft 1, and the first ring gear 23 is connected to the power output shaft 1. The first brake 6 is closed, and the engine output shaft 311 is engaged with the hybrid transmission housing, so that the engine output shaft 311 can be locked. This mode is the electric drive second gear mode. At this time, the first drive motor 32 and the second drive motor 33 jointly drive the vehicle. The transmission route of the hybrid system 100 is as follows: the driving force of the first drive motor 32 is transmitted to the power output shaft 1 via the first sun gear 21 and the first ring gear 23; the driving force of the second drive motor 33 is transmitted to the power output shaft 1 via the second sun gear 441 and the second planetary carrier 442.

[0075] When the hybrid system 100 is in the fourth working mode, the engine 31 is driven, the first drive motor 32 and the second drive motor 33 are driven or stopped, the first clutch 51 moves to the left, the engine output shaft 311 is combined with the first transmission shaft 34, so that the first planetary carrier 22 is connected to the first sun gear 21, the third clutch 53 is closed, the first ring gear 23 is combined with the power output shaft 1, so that the first ring gear 23 is connected to the power output shaft 1, the first brake 6 is disconnected, and the engine output shaft 311 is separated from the housing of the hybrid transmission, so that the engine output shaft 311 can output torque. This mode is the engine direct Drive 1 mode, at this time, the engine 31 directly drives the vehicle, the first drive motor 32 and the second drive motor 33 are driven or stopped, and the transmission route of the hybrid system 100 is: the driving force of the engine 31 is transmitted to the power output shaft 1 via the engine output shaft 311, the first transmission shaft 34, the first sun gear 21 and the first ring gear 23; the driving force of the first drive motor 32 is transmitted to the power output shaft 1 via the first sun gear 21 and the first ring gear 23; the driving force of the second drive motor 33 is transmitted to the power output shaft 1 via the second transmission shaft 41, the second sun gear 441 and the second planetary carrier 442.

[0076] When the hybrid system 100 is in the fifth working mode, the engine 31 is driven, the first drive motor 32 and the second drive motor 33 are driven or stopped, the first clutch 51 moves to the right, the first transmission shaft 34 is combined with the housing of the hybrid transmission, so that the first sun gear 21 can be locked, the third clutch 53 is closed, the first ring gear 23 is combined with the power output shaft 1, so that the first ring gear 23 is connected to the power output shaft 1, the first brake 6 is disconnected, and the engine output shaft 311 is separated from the housing of the hybrid transmission, so that the engine output shaft 311 can output torque. This mode is the engine direct Drive 2nd gear mode, at this time, the engine 31 directly drives the vehicle, the first drive motor 32 and the second drive motor 33 are driven or stopped, and the transmission route of the hybrid system 100 is: the driving force of the engine 31 is transmitted to the power output shaft 1 via the engine output shaft 311, the first planetary carrier 22 and the first ring gear 23; the driving force of the first drive motor 32 is transmitted to the power output shaft 1 via the first sun gear 21 and the first ring gear 23; the driving force of the second drive motor 33 is transmitted to the power output shaft 1 via the second transmission shaft 41, the second sun gear 441 and the second planetary carrier 442.

[0077] When the hybrid system 100 is in the sixth working mode, the engine 31 is driven, the first drive motor 32 is driven or generates electricity, the second drive motor is driven or stopped, the first clutch 51 moves to the middle, the engine output shaft 311 is separated from the first transmission shaft 34, so that the first planetary carrier 22 is disconnected from the first sun gear 21, the third clutch 53 is closed, the first ring gear 23 is combined with the power output shaft 1, so that the first ring gear 23 is connected to the power output shaft 1, the first brake 6 is disconnected, and the engine output shaft 311 is separated from the housing of the hybrid transmission, so that the engine output shaft 311 can output torque. Torque, this mode is the driving power generation mode, that is, the continuously variable transmission mode. At this time, the engine 31 and the first drive motor 32 use ECVT to jointly drive the vehicle. The transmission route of the hybrid system 100 is: the driving force of the engine 31 is transmitted to the power output shaft 1 through the engine output shaft 311, the first planetary carrier 22 and the first ring gear 23; the driving force of the first drive motor 32 is transmitted to the power output shaft 1 through the first sun gear 21 and the first ring gear 23; the driving force of the second drive motor 33 is transmitted to the power output shaft 1 through the second transmission shaft 41, the second sun gear 441 and the second planetary carrier 442.

[0078] When the hybrid system 100 is in the seventh operating mode, the engine 31 is driven, the first drive motor 32 and the second drive motor 33 are driven or generate electricity, the first clutch 51 moves to the middle position, the engine output shaft 311 is separated from the first transmission shaft 34, so that the first planetary carrier 22 is disconnected from the first sun gear 21, the third clutch 53 is disengaged, the first ring gear 23 is separated from the power output shaft 1, so that the first ring gear 23 is disconnected from the power output shaft 1, the first brake 6 is disengaged, and the engine output shaft 311 is separated from the housing of the hybrid transmission, so that the engine output shaft 311 can output torque. This mode is the first implementation method of energy recovery. At this time, the second drive motor 33 recovers power. The transmission route of the hybrid system 100 is: the driving force of the power output shaft 1 is transmitted to the second transmission shaft 41 via the second planetary carrier 442 and the second sun gear 441.

[0079] The present invention also proposes a vehicle, which includes a hybrid system 100. The specific structure of the hybrid system 100 refers to the above-mentioned embodiment. Since this vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0080] See also Figure 3 , Figure 3This is a schematic diagram of the structure of the control module of the hardware operating environment involved in the embodiment of the present invention.

[0081] like Figure 3 As shown, the control module may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may optionally be a storage device independent of the aforementioned processor 1001.

[0082] Those skilled in the art will understand that Figure 3 The structure shown in the figure does not constitute a limitation on the control module, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0083] Based on the above hybrid system 100, the present invention further proposes a control method for the hybrid system 100. Figure 4 , Figure 4 FIG. 1 is a flow chart of a first embodiment of a control method for a hybrid system 100 according to the present invention.

[0084] The control method of the hybrid system 100 includes the following steps:

[0085] Step S10: obtaining the type of power output mode;

[0086] It should be noted that there are multiple power output modes, such as pure electric drive mode, engine direct drive mode, driving power generation mode, series mode and power recovery mode, etc., and the present invention does not limit this.

[0087] Step S20: Control the power module and the clutch module 5 to operate according to the type of the power output mode.

[0088] In the above steps, the power module and the clutch module 5 are controlled to operate so that the engine 31 and / or the first drive motor 32 and / or the second drive motor 33 drive the vehicle. The power output shaft 1 is coaxially arranged with the planetary gear structure and the engine output shaft 311 to reduce the radial size of the hybrid system 100 along the power output shaft 1. At the same time, by setting the planetary gear structure, on the one hand, the engine 31 can intervene in the drive at low speed to avoid motor stalling, which helps the vehicle to get out of trouble or climb a slope. On the other hand, a power splitting method can be used when feeding power or shifting gears, which can not only ensure smooth shifting and reduce the risk of the hybrid system 100 being stuck, but also improve the overall power economy of the vehicle while ensuring vehicle power.

[0089] It should be noted that the type of the power output mode can be obtained by automatic vehicle identification or by driver operation. For example, the selection between the pure electric drive module and the engine direct drive mode can be made by the driver according to the vehicle's load and driving conditions. The selection between the engine direct drive 1st gear mode and the engine direct drive 2nd gear mode can be made by the driver according to driving needs. Of course, in other embodiments, the vehicle can also make a selection based on its own driving conditions. Specifically, this application does not limit this.

[0090] In addition, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0091] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0092] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a more preferred embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to control the hybrid system to execute the methods described in various embodiments of the present invention.

[0093] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A hybrid system, characterized in that: include: Power take-off shaft; a first planetary gear set, coaxially arranged with the power output shaft, comprising a first sun gear, a first planet carrier and a first ring gear, wherein the first ring gear is drivingly connected to the power output shaft; A power module includes an engine, a first drive motor, and a second drive motor, wherein the engine has an engine output shaft, the engine output shaft is coaxially arranged with the power output shaft and fixedly connected to the first planetary carrier, the first drive motor is transmission-connected to the first sun gear via a first transmission shaft, and the second drive motor is transmission-connected to the power output shaft via a transmission reduction mechanism; a clutch module, comprising a first clutch provided between the engine output shaft and the first transmission shaft, for selectively controlling the connection and disconnection between the engine output shaft and the first transmission shaft; and The control module is electrically connected to the power module and the clutch module.

2. The hybrid system according to claim 1, wherein: The transmission reduction mechanism comprises: a second transmission shaft, sleeved on the power output shaft and extending along the axial direction of the power output shaft; and a second planetary gear, comprising a second sun gear, a second planet carrier, and a second ring gear, wherein the second sun gear is sleeved on the power output shaft and fixedly connected to the second transmission shaft, the second planet carrier is fixedly connected to the power output shaft, and the second ring gear is fixedly connected to the housing; Wherein, the second driving motor is drivingly connected to the second transmission shaft.

3. The hybrid system according to claim 2, wherein: The rotor of the second drive motor is sleeved on the power output shaft and fixedly connected to the second transmission shaft.

4. The hybrid system according to claim 1, wherein: The transmission reduction mechanism comprises: a second transmission shaft, disposed between the engine output shaft and the power output shaft, and coaxially arranged with the power output shaft; a third transmission shaft extending in the axial direction of the power output shaft and spaced apart from the second transmission shaft in the radial direction of the power output shaft; and The first transmission structure includes a first transmission gear set and a second transmission gear set, wherein the first transmission gear set is arranged between the second transmission shaft and the third transmission shaft, and the second transmission gear set is arranged between the third transmission shaft and the power output shaft.

5. The hybrid system according to claim 4, characterized in that: Two first transmission gear sets are provided, and the transmission ratios of the two first transmission gear sets are different; The clutch module further includes a second clutch fixed to the second transmission shaft, for selectively controlling the engagement and disengagement of one of the two first transmission gear sets with the second transmission shaft.

6. The hybrid system according to claim 1, wherein: The clutch module further includes a third clutch provided between the first ring gear and the power output shaft, for selectively controlling the connection and disconnection between the first ring gear and the power output shaft.

7. The hybrid system according to claim 1, wherein: The hybrid system further includes a first brake provided on the engine output shaft for selectively locking the engine output shaft.

8. The hybrid system according to claim 1, wherein: The hybrid system further includes a torque limiting shock absorber provided on the engine output shaft.

9. A vehicle, characterized in that: Comprising the hybrid system according to any one of claims 1 to 8.

10. A control method for a hybrid system, based on the hybrid system according to any one of claims 1 to 8, characterized in that: The control method of the hybrid system comprises the following steps: Get the type of power output mode; According to the type of the power output mode, the power module and the clutch module are controlled to operate.

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