Dual-motor multi-gear hybrid power system and working method thereof

Abstract

The invention discloses a dual-motor multi-gear hybrid power system which comprises an engine, a first motor, a second motor and a transmission mechanism. The transmission mechanism comprises an output shaft, a first input shaft in transmission connection with the output end of the first motor, a second input shaft in transmission connection with the output end of the second motor, a third input shaft in transmission connection with the output end of the engine, and a first-gear gear assembly arranged between the first input shaft and the output shaft and used for shifting gears to transmit power. The second-gear gear assembly is arranged between the second input shaft and the output shaft and used for shifting gears to transmit power, and the three-position synchronizer is arranged among the first input shaft, the second input shaft and the third input shaft. The invention further discloses a working method of the dual-motor multi-gear hybrid power system. According to the system and the working method thereof, the optimization effect on the use efficiency of the motor and the engine can be improved; and meanwhile, the use comfort can be improved, the system structure can be simplified, and the compactness of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid vehicle, and in particular to a dual-motor multi-speed hybrid power system and a working method thereof. Background Art

[0002] With the world's energy shortage and people's increasing environmental awareness, safety, energy saving and environmental protection have become the themes of automobile development. At the same time, due to the bottleneck of key technologies of pure electric vehicles and fuel cell vehicles, hybrid vehicles have become an appropriate choice. The dual-motor multi-gear hybrid system can flexibly use the power of the engine and motor according to demand to achieve the purpose of energy saving.

[0003] At present, in the dual-motor multi-gear hybrid system used in hybrid vehicles, the power of the engine is generally connected to a single shaft and a dual shaft through a dual clutch, part of the power is output by a single shaft, and part of the power is output by a dual shaft. The power output of the matching motor is transmitted to a single shaft or a dual shaft. When applied to vehicles, there are fewer gears that can be achieved in the pure electric drive mode and the hybrid drive mode, and the optimization effect on the efficiency of the motor and the engine is limited. At the same time, in the existing dual-motor multi-gear hybrid system, usually one motor is only used as a generator, and the other motor is only used as a drive motor. It is impossible to achieve the full power working mode of the engine and the dual motors in the hybrid mode. In this way, the system power needs to be improved. In addition, in its pure electric working mode, it is basically driven by a single motor, and there will be power interruption when shifting gears, which is not comfortable.

[0004] Of course, in other dual-motor multi-speed hybrid systems, multiple clutches and / or synchronizers are used, and each motor is equipped with a separate multi-speed transmission mechanism to improve the power and economy of the motor and engine. However, there are often problems such as overly complex structure, long transmission path, poor compactness, etc., which affect the power transmission performance of the hybrid transmission system and the compactness of the vehicle layout.

[0005] Therefore, it is necessary to develop and design a new dual-motor multi-speed hybrid power system and its working method, so as to help improve the optimization effect on the efficiency of the use of motors and engines, thereby improving the economy and power of the system; at the same time, it can help improve the comfort of use, simplify the system structure, and improve the compactness of the system. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a dual-motor multi-speed hybrid power system and a working method thereof, which can help improve the optimization effect on the efficiency of motor and engine use, thereby improving the system economy and power; at the same time, it can help improve the comfort of use, simplify the system structure, and improve the compactness of the system.

[0007] To achieve the above object, the present invention provides the following technical solution: a dual-motor multi-speed hybrid power system, comprising an engine, a first motor, a second motor and a transmission mechanism, wherein the transmission mechanism comprises:

[0008] an output shaft, a first input shaft drivingly connected to the output end of the first motor, a second input shaft drivingly connected to the output end of the second motor, a third input shaft drivingly connected to the output end of the engine, a first gear gear assembly configured between the first input shaft and the output shaft for shifting gears and transmitting power, a second gear gear assembly configured between the second input shaft and the output shaft for shifting gears and transmitting power, and a three-position synchronizer arranged between the first input shaft, the second input shaft and the third input shaft;

[0009] The three-position synchronizer has a first working position for linking the first input shaft and the third input shaft, a second working position for linking the second input shaft and the third input shaft, and a third working position for linking the first input shaft, the second input shaft and the third input shaft.

[0010] Furthermore, the input end of the third input shaft is connected to the output end of the engine via a clutch transmission.

[0011] Furthermore, the first input shaft is coaxially arranged with the axis of the second input shaft, and the first input shaft is a hollow shaft. The third input shaft is rotatably inserted into the first input shaft and extends toward the second input shaft to be rotatably connected to the second input shaft.

[0012] Further, the three-position synchronizer comprises a first coupling tooth fixedly arranged at the rear end of the first input shaft, a second coupling tooth fixedly arranged at the front end of the second input shaft, a third coupling tooth located between the first coupling tooth and the second coupling tooth and fixedly arranged on the third input shaft, and a coupling sleeve which can be operated to slide on the third coupling tooth;

[0013] The coupling sleeve has a first position that allows the first coupling tooth and the third coupling tooth to couple, a second position that allows the second coupling tooth and the third coupling tooth to couple, and a third position that allows the first coupling tooth, the second coupling tooth and the third coupling tooth to couple simultaneously. The first position, the second position and the third position correspond to the first working position, the second working position and the third working position of the three-position synchronizer, respectively.

[0014] Furthermore, the first input shaft is coaxially fixedly connected to the output shaft of the first motor as a whole, and the second input shaft is coaxially fixedly connected to the output shaft of the second motor as a whole.

[0015] Furthermore, a support bearing is provided between the first input shaft and the third input shaft.

[0016] Further, the first gear gear assembly includes a second gear gear pair and a fourth gear gear pair arranged between the first input shaft and the output shaft, and a first shift assembly arranged between the second gear gear pair and the fourth gear gear pair for corresponding gear conversion; the second gear gear assembly includes a first gear gear pair and a third gear gear pair arranged between the second input shaft and the output shaft, and a second shift assembly arranged between the first gear gear pair and the third gear gear pair for corresponding gear conversion.

[0017] Furthermore, both the first shift assembly and the second shift assembly employ synchronizers.

[0018] Furthermore, a differential is included, an output gear is fixedly arranged on the output shaft, and the input end of the differential is meshed with the output gear.

[0019] A working method of a dual-motor multi-speed hybrid power system is also provided. Based on the dual-motor multi-speed hybrid power system described above, the method has the following working modes:

[0020] Dual-motor pure electric mode: The engine does not work, and the first motor and the second motor work together to complete multi-speed power output;

[0021] Extended range mode: the engine is running, the three-position synchronizer is in the first working position, the first motor is used as a generator to generate electricity, and the second motor is used as a drive motor to drive; or the engine is running, the three-position synchronizer is in the second working position, the second motor is used as a generator to generate electricity, and the first motor is used as a drive motor to drive;

[0022] Engine direct drive mode: The engine is working, the three-position synchronizer is in the third working position, and the corresponding gear is engaged according to the speed requirement to complete the power output;

[0023] Hybrid mode: The engine is working, the first motor and the second motor both serve as drive motors and cooperate with the engine to achieve multi-gear power output;

[0024] Parking power generation mode: the first gear gear assembly and the second gear gear assembly are not engaged, the engine is running, and the first motor and / or the second motor completes the parking power generation.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The dual-motor multi-speed hybrid power system provided by the present invention can help improve the optimization effect of the use efficiency of the motor and the engine, thereby improving the economy and power of the system; at the same time, it can help improve the comfort of use, simplify the system structure, and improve the compactness of the system. Specifically, it is embodied in:

[0027] 1. The three-position synchronizer configured in this system can enable the engine, the first motor and the second motor to work in full gear of the first gear gear assembly and the second gear gear assembly. The number of achievable gears is large, and the optimization effect on the efficiency of the motor and the engine is good, which is conducive to improving the economy and power of the system;

[0028] 2. By controlling the three-position synchronizer to be in different working positions, more working modes can be realized, making the system applicable to a wider range of working conditions, which is beneficial to improving the economy and power of the system;

[0029] 3. In pure electric mode, dual motors can be driven together. When the gears of any power route of the first motor and the second motor are switched, the other power route can always maintain power output, which can realize gear shift power compensation and ensure uninterrupted gear shift power, with good power performance and driving comfort.

[0030] 4. In this system, the power of the engine, the first motor and the second motor is directly connected to the corresponding input shaft of the transmission mechanism. At the same time, the first gear gear assembly and the second gear gear assembly can be linked by a three-position synchronizer. The system power transmission path is short and the power transmission performance is good.

[0031] 5. In the hybrid mode, the system can realize the full power mode in which the first motor, the second motor and the engine are driven simultaneously, and the system has good power performance; at the same time, it can also realize the non-power interruption shifting in the hybrid mode, and the driving comfort is good;

[0032] 6. The system cleverly uses a three-position synchronizer to achieve power coupling between the first motor, the second motor and the engine. Under the premise of realizing multiple working modes, it can effectively reduce the number of clutches or synchronizers used, simplify the system structure, and improve the system compactness.

[0033] The working method of the dual-motor multi-speed hybrid power system provided by the present invention can adapt to a wide range of working conditions, can be beneficial to improving the economy and power of the system, has a simple working logic, and is beneficial to simplifying the system structure.

[0034] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention;

[0036] Figure 2It is a schematic diagram of the cross-sectional structure of the three-position synchronizer of the present invention in the third working position;

[0037] Figure 3 It is a schematic diagram of the cross-sectional structure of the three-position synchronizer of the present invention in the first working position;

[0038] Figure 4 It is a schematic diagram of the cross-sectional structure of the three-position synchronizer of the present invention in the second working position;

[0039] Figure numerals: 1-engine; 2-first motor; 3-second motor; 4-output shaft; 401-output gear; 5-first input shaft; 501-support bearing; 6-second input shaft; 7-third input shaft; 8-first gear gear assembly; 801-second gear gear pair; 802-fourth gear gear pair; 803-first shift assembly; 9-second gear gear assembly; 901-first gear gear pair; 902-third gear gear pair; 903-second shift assembly; 10-three-position synchronizer; 11-clutch; 12-differential. DETAILED DESCRIPTION

[0040] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0041] It is necessary to explain that, unless otherwise specified, the following Figure 1 The left end is the front end, and the right end is the rear end.

[0042] See also Figure 1-4In this embodiment, a dual-motor multi-speed hybrid system is disclosed, comprising an engine 1, a first motor 2, a second motor 3 and a transmission mechanism, wherein the transmission mechanism comprises: an output shaft 4, a first input shaft 5 connected to the output end of the first motor 2, a second input shaft 6 connected to the output end of the second motor 3, a third input shaft 7 connected to the output end of the engine 1, a first gear gear assembly 8 arranged between the first input shaft 5 and the output shaft 4 for shifting gears and transmitting power, a second gear gear assembly 9 arranged between the second input shaft 6 and the output shaft 4 for shifting gears and transmitting power, and a three-position synchronizer 10 arranged between the first input shaft 5, the second input shaft 6 and the third input shaft 7; wherein the three-position synchronizer 10 has a first working position for linking the first input shaft 5 and the third input shaft 7, a second working position for linking the second input shaft 6 and the third input shaft 7, and a third working position for linking the first input shaft 5, the second input shaft 6 and the third input shaft 7. It can be understood that in this dual-motor multi-speed hybrid system, the first motor 2 and the second motor 3 are switched to generators or motors as needed, that is, they have both power generation and electric functions. By controlling the three-position synchronizer 10 to be in different working positions, various working modes of the system can be realized. The specific implementation principle will be described later in conjunction with the specific number of gears. It can be understood that the first gear gear assembly 6 and the second gear gear assembly 7 can be selected according to the specific gear usage requirements to realize a multi-gear working mode.

[0043] The dual-motor multi-speed hybrid power system provided above can help improve the optimization effect on the efficiency of the motor and engine, thereby improving the economy and power of the system; at the same time, it can help improve the comfort of use, simplify the system structure, and improve the compactness of the system. Specifically, it is embodied in: 1. The three-position synchronizer 10 configured in this system can enable the engine 1, the first motor 2 and the second motor 3 to work in the first gear gear assembly 8 and the second gear gear assembly 9 in full gear. The number of achievable gears is large, and the optimization effect on the efficiency of the motor and engine 1 is good, which is conducive to improving the economy and power of the system; 2. By controlling the three-position synchronizer 10 to be in different working positions, more working modes can be achieved, making the system more applicable to a wider range of working conditions, which is conducive to improving the economy and power of the system; 3. In pure electric mode, dual-motor coordinated driving can be achieved. When any power route of the first motor 2 and the second motor 3 switches gears, the other power route can always maintain power output, and gear shift power compensation can be achieved to ensure that the gear shift power is not interrupted, and the power and driving comfort are good; 4. In the present system, the power of the engine 1, the first motor 2 and the second motor 3 are directly connected to the corresponding input shaft of the transmission mechanism. At the same time, the first gear gear assembly 8 and the second gear gear assembly 9 can be linked by a three-position synchronizer 10, and the system power transmission path is short and the power transmission performance is good; 5. In the hybrid mode, the present system can realize the full-power mode in which the first motor 2, the second motor 3 and the engine 1 are driven simultaneously, and the system has good power performance; at the same time, it can also realize the non-power interruption shifting in the hybrid mode, and the driving comfort is good; 6. In the present system, the three-position synchronizer is cleverly used to realize the power coupling between the first motor 2, the second motor 3 and the engine 1. On the premise of realizing multiple working modes, the number of clutches or synchronizers used can be effectively reduced, the system structure is simplified, and the system compactness is high, which is conducive to improving the system compactness.

[0044] In this embodiment, the input end of the third input shaft 7 is connected to the output end of the engine 1 through a clutch 11; the assembly and selection of the clutch 11 are consistent with the prior art and will not be described in detail here. By setting the clutch 11 between the third input shaft 7 and the output end of the engine 1, it can participate in the system control and be used to control the connection and disconnection of the power of the engine 1. In the pure electric mode, the clutch 11 is disconnected to avoid power loss caused by the engine following the motor idling, thereby further reducing the motor power loss and improving the system economy. At the same time, it is beneficial to increase the service life of the engine and improve the reliability of the system.

[0045] In this embodiment, the first input shaft 5 is coaxially arranged with the axis of the second input shaft 6, and the first input shaft 5 is a hollow shaft, and the third input shaft 7 is rotatably inserted into the first input shaft 5 and extends to the second input shaft 6 side and is rotatably connected with the second input shaft 6. Specifically, a rotation mounting hole is provided at the front end of the second input shaft 6, and the third input shaft 7 extends into the rotation mounting hole. In this arrangement structure, the first input shaft 5, the second input shaft 6 and the third input shaft 7 are arranged reasonably, and the system is highly compact. At the same time, it is conducive to the arrangement and structural design of the three-position synchronizer 10, and simplifies the structure of the three-position synchronizer 10. At the same time, the third input shaft 7 is installed by using the first input shaft 5 and the second input shaft 6, and the installation reliability is high, which is conducive to ensuring the stability of power transmission.

[0046] In this embodiment, refer to Figure 2 , Figure 3 and Figure 4 The three-position synchronizer 10 includes a first combination tooth 10a fixed at the rear end of the first input shaft 5, a second combination tooth 10b fixed at the front end of the second input shaft 6, a third combination tooth 10c located between the first combination tooth 10a and the second combination tooth 10b and fixed on the third input shaft 7, and a combination sleeve 10d that can be operated and slidably arranged on the third combination tooth 10c; the combination sleeve 10d has a first position that allows the first combination tooth 10a and the third combination tooth 10c to be combined, a second position that allows the second combination tooth 10b and the third combination tooth 10c to be combined, and a third position that allows the first combination tooth 10a, the second combination tooth 10b and the third combination tooth 10c to be combined at the same time, and the first position, the second position and the third position correspond to the first working position, the second working position and the third working position of the three-position synchronizer 10 respectively. It can be understood that the first combination tooth 10a, the second combination tooth 10b, and the third combination tooth 10c can be selected as straight teeth or helical teeth, and the combination sleeve 10d is adapted to be set. The way in which the coupling sleeve 10d is driven to slide is the prior art, such as controlling the sliding by a shift fork, etc., which will not be described in detail here. The three-position synchronizer 10 in this structural design uses the coupling sleeve 10d to control the power coupling between the first input shaft 5, the second input shaft 6 and the third input shaft 7. It has a simple structure, is easy to manufacture, disassemble and repair, has a large number of engaging teeth that bear impact loads, and is not easy to be damaged; at the same time, the coupling sleeve has a short gear shifting stroke, which is conducive to shortening the axial size of the system and further improving the compactness of the system.

[0047] In this embodiment, the first input shaft 5 is coaxially fixedly connected to the output shaft of the first motor 2, and the second input shaft 6 is coaxially fixedly connected to the output shaft of the second motor 3. It can be understood that the "fixedly connected as one" mentioned here includes directly adopting an integrated structure, or adopting a spline connection and other structural forms. In this structural design, by arranging the first motor 2, the second motor 3, and the first input shaft 5 and the second input shaft 6 coaxially, the lateral space occupied by the dual motor arrangement is effectively reduced, which can help further ensure the compactness of the system and reduce the system volume. At the same time, the motor is directly connected, which can help reduce the transmission chain and improve the transmission efficiency.

[0048] In this embodiment, a support bearing 501 is provided between the first input shaft 5 and the third input shaft 7. Specifically, two sets of needle bearings are used. The support bearing 501 is provided to improve the stability of power transmission and the reliability of the system.

[0049] In this embodiment, the first gear gear assembly 8 includes a second gear pair 801 and a fourth gear pair 802 arranged between the first input shaft 5 and the output shaft 4, and a first shift assembly 803 arranged between the second gear pair 801 and the fourth gear pair 802 for corresponding gear conversion; the second gear gear assembly 9 includes a first gear pair 901 and a third gear pair 902 arranged between the second input shaft 6 and the output shaft 4, and a second shift assembly 903 arranged between the first gear pair 901 and the third gear pair 902 for corresponding gear conversion. The first gear gear assembly 8 and the second gear gear assembly 9 in this structural design are respectively provided with two gears, and the system is embodied as a four-speed transmission system, so that the first motor 2 and the second motor 3 have four gears to choose from, which has a good optimization effect on the motor use efficiency. At the same time, in this structural design, the first and third gears are configured on the second input shaft 6, the second and fourth gears are configured on the first input shaft 5, and the odd gears and even gears are separately arranged, which can effectively reduce the gear shift drop, ensure the gear shift stability, and help to improve the service life of the system.

[0050] More specifically, in the present embodiment, the first gear gear pair 901 includes a first gear driving gear fixedly mounted on the second input shaft 6 and a first gear driven gear rotatably mounted on the output shaft 4 and meshing with the first gear driving gear; the third gear gear pair 902 includes a third gear driving gear fixedly mounted on the second input shaft 6 and a third gear driven gear rotatably mounted on the output shaft 4 and meshing with the third gear driving gear; the first shift assembly 903 is disposed on the output shaft 4 and is configured to selectively link the output shaft 4 with the first gear driven gear or the third gear driven gear. The second gear pair 801 includes a second gear driving gear fixed on the first input shaft 5 and a second gear driven gear rotatably disposed on the output shaft 4 and meshing with the second gear driving gear; the fourth gear pair 802 includes a fourth gear driving gear fixed on the second input shaft 5 and a fourth gear driven gear rotatably disposed on the output shaft 4 and meshing with the fourth gear driving gear; the second shift assembly 803 is disposed on the output shaft 4 and is configured to selectively link the output shaft 4 with the second gear driven gear or the fourth gear driven gear. In the structural design, the first shift assembly 803 and the second shift assembly 903 are both disposed on the output shaft 3, with good compactness and convenient for shifting operation.

[0051] In this embodiment, the first shift assembly 8 and the second shift assembly 9 both use synchronizers. It can be understood that the synchronizer is arranged between two adjacent gear pairs, and its specific structure is consistent with the existing synchronizer arrangement method, which will not be repeated here. By adopting the synchronizer, it is conducive to achieving rapid, impact-free, and noise-free shifting, improving the acceleration, fuel economy and driving safety of the car, and providing high driving comfort.

[0052] In this embodiment, a differential 12 is also included, and an output gear 401 is fixedly provided on the output shaft 4, and the input end of the differential 12 is meshed with the output gear 401. The output gear 401 is provided to facilitate the torque increase output of power, thereby facilitating the reduction of the gear center distance of the gear assembly, thereby further ensuring the compactness of the system. By integrating the differential 10 in the system, it is beneficial to further ensure the compactness of the system vehicle layout.

[0053] In the present embodiment, a working method of a dual-motor multi-speed hybrid power system is also disclosed. Based on the above-mentioned dual-motor multi-speed hybrid power system, it has the following working modes: dual-motor pure electric mode: the engine 1 is not working, and the first motor 2 and the second motor 3 cooperate to complete the multi-speed power output; extended-range mode: the engine 1 is working, the three-position synchronizer 10 is in the first working position, the first motor 2 is used as a generator to generate electricity, and the second motor 3 is used as a drive motor to drive; or, the engine 1 is working, the three-position synchronizer 10 is in the second working position, the second motor 3 is used as a generator to generate electricity, and the first motor 2 is used as a drive motor to drive; engine direct drive mode: the engine 1 is working, the three-position synchronizer 10 is in the third working position, and the corresponding gear is engaged according to the speed requirement to complete the power output; hybrid mode: the engine 1 is working, the first motor 2 and the second motor 3 are both used as drive motors and cooperate with the engine 1 to complete the multi-speed power output; parking power generation mode: the first gear gear assembly 8 and the second gear gear assembly 9 are not engaged, the engine 1 is working, and the first motor 2 and / or the second motor 3 complete the parking power generation. The working method of the dual-motor multi-speed hybrid power system can adapt to a wide range of working conditions, can be beneficial to improving the economy and power of the system, has a simple working logic, and is beneficial to simplifying the system structure.

[0054] The following is combined with Figure 1 , the implementation principle of the dual-motor multi-speed hybrid power system in this embodiment is described in detail:

[0055] Dual-motor pure electric mode: Engine 1 is not working, clutch 11 is disconnected, and the working gears are as follows:

[0056] (1) The three-position synchronizer 10 is in the first working position or the second working position, the second gear position gear assembly 9 is in the right gear, and the second motor 3 is driven alone in the first gear;

[0057] (2) The three-position synchronizer 10 is in the third working position, the second gear gear assembly 9 is in the right gear, and the first motor 2 and the second motor 3 are driven in series in the first gear;

[0058] (3) The three-position synchronizer 10 is in the first working position or the second working position, the second gear gear assembly 9 is in the right gear, the first gear gear assembly 8 is in the left gear, and the second motor 3 is in the first gear and the first motor 2 is in the second gear and driven in parallel;

[0059] (4) The three-position synchronizer 10 is in the first working position or the second working position, the first gear gear assembly 8 is in the left gear, and the first motor 2 is driven alone in the second gear;

[0060] (5) The three-position synchronizer 10 is in the third working position, the first gear gear assembly 8 is in the left gear, the first motor 2 is in the second gear and the second motor 3 is in the second gear and driven in series;

[0061] (6) The three-position synchronizer 10 is in the first working position or the second working position, the first gear gear assembly 8 is in the left gear, the second gear gear assembly 9 is in the left gear, and the second motor 3 is in the third gear and the first motor 2 is in the second gear and driven in parallel;

[0062] (7) The three-position synchronizer 10 is in the first working position or the second working position, the second gear position gear assembly 9 is in the left gear, and the second motor 2 is driven alone in the third gear;

[0063] (8) The three-position synchronizer 10 is in the third working position, the second-speed gear assembly 9 is in the left gear, and the first motor 2 and the second motor 3 are connected in series and driven in the third gear;

[0064] (9) The three-position synchronizer 10 is in the first working position or the second working position, the second gear gear assembly 9 is in the left gear, the first gear gear assembly 8 is in the right gear, and the second motor 2 is in the third gear and the first motor 2 is in the fourth gear and driven in parallel;

[0065] (10) The three-position synchronizer 10 is in the first working position or the second working position, the first gear gear assembly 8 is in the right gear, and the first motor 2 is driven alone in the fourth gear;

[0066] (11) The three-position synchronizer 10 is in the third working position, the first-gear gear assembly 8 is in the right gear, and the first motor 2 and the second motor 3 are connected in series to drive in the fourth gear.

[0067] It is understandable that in the dual-motor pure electric working mode, the dual motors are used together to achieve the pure electric working mode, and the engine 11 does not work. Here, the implementation principle is explained using the four-speed transmission system as an example. When designed as other gears, the implementation principle is similar. It can be seen that any of the dual motors can have the working gear of all gear pairs in the system, which has a good effect on optimizing the efficiency of motor use. The gear shifting continuity is good, and smooth gear shifting of sequential gears can be achieved, and power shifting is not interrupted. The acceleration performance of the dual motor series gear is good, and the climbing performance of the low-speed dual motor gear is good.

[0068] Extended range mode:

[0069] The engine 1 is working, the clutch 11 is engaged, the three-position synchronizer 10 is in the first working position, the first motor 2 is used as a generator to generate electricity, the first gear gear assembly 8 is not in gear, the second motor 3 is driven as a drive motor, and power transmission is completed through the second gear gear assembly 9;

[0070] Alternatively, the engine 1 is working, the clutch 11 is engaged, the three-position synchronizer 10 is in the second working position, the second motor 3 is used as a generator to generate electricity, the second gear gear assembly 9 is not engaged, the first motor 2 is driven as a drive motor, and power transmission is completed through the first gear gear assembly 8;

[0071] It can be seen that the extended-range mode of the system can selectively use the second motor 3 or the first motor 2 as an engine to generate electricity. The system has high flexibility, which is beneficial to ensuring the service life of the system. At the same time, in the extended-range mode, the drive motor has two gears to choose from, which is beneficial to ensuring the power economy in the extended-range mode.

[0072] Engine direct drive mode: the engine 1 is working, the clutch 11 is engaged, the three-position synchronizer 10 is in the third working position, and the corresponding gear is engaged according to the speed requirement to complete the power output; at this moment, the first motor 2 and the second motor 3 control whether to generate electricity according to the torque requirement; in this mode, the engine 1 can have four gears to choose from, and the engine 1 has good working efficiency, which is conducive to ensuring the power economy in the engine direct drive mode.

[0073] Hybrid mode: engine 1 is working, clutch 11 is engaged, the first motor 2 and the second motor 3 both act as drive motors and cooperate with the engine 1 to complete multi-gear power output; the working gears of this mode are similar to those of the dual-motor pure electric mode, the difference is that when the three-position synchronizer 10 is in different working positions, the engine 1 is working and participates in the drive, which will not be described in detail here; among them, the first motor 2 and the second motor 3 can start the engine to work accordingly when the three-position synchronizer 10 is in the first working position and the second working position, thereby entering the full-power drive mode of the engine 1, the first motor 2 and the second motor 3, effectively improving the power of the system and improving the climbing and acceleration performance.

[0074] Parking power generation mode: the first gear gear assembly 8 and the second gear gear assembly 9 are not engaged, the engine 1 is working, and the first motor 2 and / or the second motor 3 complete the parking power generation; it can be understood as the parking neutral gear power generation mode.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A dual-motor multi-speed hybrid power system, comprising an engine (1), a first motor (2), a second motor (3) and a transmission mechanism, characterized in that: The transmission mechanism comprises: An output shaft (4), a first input shaft (5) drivingly connected to the output end of the first motor (2), a second input shaft (6) drivingly connected to the output end of the second motor (3), a third input shaft (7) drivingly connected to the output end of the engine (1), a first gear position gear assembly (8) arranged between the first input shaft (5) and the output shaft (4) for shifting gears and transmitting power, a second gear position gear assembly (9) arranged between the second input shaft (6) and the output shaft (4) for shifting gears and transmitting power, and a three-position synchronizer (10) arranged between the first input shaft (5), the second input shaft (6) and the third input shaft (7); The three-position synchronizer (10) has a first working position for linking the first input shaft (5) and the third input shaft (7), a second working position for linking the second input shaft (6) and the third input shaft (7), and a third working position for linking the first input shaft (5), the second input shaft (6) and the third input shaft (7).

2. The dual-motor multi-speed hybrid power system according to claim 1, characterized in that: The input end of the third input shaft (7) is transmission-connected to the output end of the engine (1) via a clutch (11).

3. The dual-motor multi-speed hybrid power system according to claim 1, characterized in that: The first input shaft (5) and the second input shaft (6) are coaxially arranged, and the first input shaft (5) is a hollow shaft. The third input shaft (7) is rotatably inserted into the first input shaft (5) and extends toward the second input shaft (6) to be rotatably connected to the second input shaft (6).

4. The dual-motor multi-speed hybrid power system according to claim 3, characterized in that: The three-position synchronizer (10) comprises a first coupling tooth (10a) fixedly arranged at the rear end of the first input shaft (5), a second coupling tooth (10b) fixedly arranged at the front end of the second input shaft (6), a third coupling tooth (10c) located between the first coupling tooth (10a) and the second coupling tooth (10b) and fixedly arranged on the third input shaft (7), and a coupling sleeve (10d) which can be operated to slide on the third coupling tooth (10c); The coupling sleeve (10d) has a first position for coupling the first coupling tooth (10a) and the third coupling tooth (10c), a second position for coupling the second coupling tooth (10b) and the third coupling tooth (10c), and a third position for coupling the first coupling tooth (10a), the second coupling tooth (10b) and the third coupling tooth (10c) at the same time, wherein the first position, the second position and the third position respectively correspond to the first working position, the second working position and the third working position of the three-position synchronizer (10).

5. The dual-motor multi-speed hybrid power system according to claim 3, characterized in that: The first input shaft (5) is coaxially fixedly connected to the output shaft of the first motor (2) as a whole, and the second input shaft (6) is coaxially fixedly connected to the output shaft of the second motor (3) as a whole.

6. The dual-motor multi-speed hybrid power system according to claim 3, characterized in that: A support bearing (501) is provided between the first input shaft (5) and the third input shaft (7).

7. The dual-motor multi-speed hybrid power system according to claim 1, characterized in that: The first gear position gear assembly (8) comprises a second gear pair (801) and a fourth gear pair (802) arranged between the first input shaft (5) and the output shaft (4), and a first shift assembly (803) arranged between the second gear pair (801) and the fourth gear pair (802) for corresponding gear position conversion; the second gear position gear assembly (9) comprises a first gear pair (901) and a third gear pair (902) arranged between the second input shaft (6) and the output shaft (4), and a second shift assembly (903) arranged between the first gear pair (901) and the third gear pair (902) for corresponding gear position conversion.

8. The dual-motor multi-speed hybrid power system according to claim 7, characterized in that: The first shift assembly (8) and the second shift assembly (9) both use synchronizers.

9. The dual-motor multi-speed hybrid power system according to claim 1, characterized in that: It also includes a differential (12), an output gear (401) is fixedly provided on the output shaft (4), and the input end of the differential (12) is meshed with the output gear (401).

10. A working method of a dual-motor multi-speed hybrid power system, based on the dual-motor multi-speed hybrid power system according to any one of claims 1 to 9, characterized in that: It has the following working modes: Dual-motor pure electric mode: the engine (1) does not work, and the first motor (2) and the second motor (3) cooperate to complete multi-speed power output; Range-extending mode: the engine (1) is working, the three-position synchronizer (10) is in the first working position, the first motor (2) is used as a generator to generate electricity, and the second motor (3) is used as a drive motor to drive; or the engine (1) is working, the three-position synchronizer (10) is in the second working position, the second motor (3) is used as a generator to generate electricity, and the first motor (2) is used as a drive motor to drive; Engine direct drive mode: the engine (1) is working, the three-position synchronizer (10) is in the third working position, and the corresponding gear is engaged according to the speed requirement to complete the power output; Hybrid mode: the engine (1) is working, the first motor (2) and the second motor (3) both serve as drive motors and cooperate with the engine (1) to achieve multi-gear power output; Parking power generation mode: the first gear gear assembly (8) and the second gear gear assembly (9) are not engaged, the engine (1) is running, and the first motor (2) and / or the second motor (3) complete the parking power generation.

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