Dual-motor hybrid drive system and vehicle

Abstract

The present application relates to the technical field of hybrid vehicles, in particular to a dual-motor hybrid drive system and vehicle. The dual-motor hybrid drive system comprises: an intermediate shaft provided with a first gear shift piece and a second gear shift piece capable of engaging or disconnecting with part of the gears in a first gear set; an engine connected with an input shaft, the input shaft being provided with a third gear shift piece and a fourth gear shift piece capable of engaging or disconnecting with part of the gears in a second gear set; a first motor having a first motor shaft in transmission connection with the input shaft; a second motor having a second motor shaft in transmission connection with the intermediate shaft; and a front drive axle assembly having a front output shaft in transmission connection with the intermediate shaft. The present application forms different working modes by controlling the engagement or disconnection states of the first gear shift piece, the second gear shift piece, the third gear shift piece and the fourth gear shift piece and the coordination of the power sources, and the different working modes can have multi-gear output, thereby effectively reducing the fuel consumption of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of hybrid vehicle technology, and in particular to a dual-motor hybrid drive system and vehicle. Background Technology

[0002] Hybrid electric vehicles (HEVs) use batteries and fuel as energy sources, and engines and electric motors to provide propulsion. They combine the advantages of long range of traditional gasoline vehicles with the high operating efficiency and low emissions of pure electric vehicles. As an alternative to traditional energy sources, hybrid electric vehicles are developing rapidly, but they still face challenges related to driving range and charging convenience. Furthermore, due to growing concerns about environmental pollution and the energy crisis, and to meet national energy conservation and emission reduction requirements, the fuel consumption problem of luxury longitudinally mounted vehicles, which are among the most fuel-intensive automobiles, urgently needs to be addressed. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a dual-motor hybrid drive system and vehicle to solve the problem of high fuel consumption in existing hybrid vehicles.

[0004] The first aspect of the present invention provides a dual-motor hybrid drive system, comprising:

[0005] The intermediate shaft is provided with a first gear set, a first gear shifter, and a second gear shifter. The first gear shifter and the second gear shifter can engage or disengage with some gears in the first gear set.

[0006] The input shaft is equipped with a second gear set, a third gear shifter, and a fourth gear shifter. The third gear shifter and the fourth gear shifter can engage or disengage with some gears in the second gear set.

[0007] The engine is connected to the input shaft;

[0008] A first motor has a first motor shaft that is drively connected to the input shaft;

[0009] The second motor has a second motor shaft that is drively connected to the intermediate shaft;

[0010] The front drive axle assembly has a front output shaft that is drive-connected to the intermediate shaft;

[0011] By controlling the first gear shifter, the second gear shifter, the third gear shifter, and the fourth gear shifter to be in different engaged or disengaged states, at least one of the first motor shaft and the second motor shaft can be connected to the front output shaft or the input shaft in at least one gear output mode.

[0012] Preferably, the first gear set includes a fourth gear, a fifth gear, and a sixth gear loosely mounted on the intermediate shaft; the first gear shifting component can engage or disengage with the fourth gear and the fifth gear; the second gear shifting component can engage or disengage with the sixth gear.

[0013] The second gear set includes a seventh gear, an eighth gear, and a ninth gear loosely mounted on the input shaft, and a tenth gear fixedly mounted on the input shaft; the third gear shifter can engage or disengage with the seventh gear; the fourth gear shifter can engage or disengage with the eighth and ninth gears.

[0014] Preferably, the fourth gear and the seventh gear are meshed to form a third gear pair;

[0015] The fifth gear and the eighth gear mesh to form a fourth gear pair;

[0016] The sixth gear and the ninth gear mesh to form a fifth gear pair.

[0017] Preferably, a first gear is fixedly disposed on the front output shaft, and the first gear set further includes a third gear fixedly disposed on the intermediate shaft, wherein the first gear and the third gear are meshed to form a first gear pair;

[0018] A second gear is fixedly mounted on the second motor shaft, and the second gear meshes with the sixth gear to form a second gear pair;

[0019] An eleventh gear is fixedly mounted on the first motor shaft, and the tenth gear and the eleventh gear mesh to form a sixth gear pair.

[0020] Preferably, the first motor shaft and the second motor shaft are coaxially arranged to form a total motor shaft;

[0021] The twelfth gear is fixedly mounted on the main motor shaft, and the thirteenth gear is loosely mounted; the twelfth gear meshes with the ninth gear to form the seventh gear pair; the thirteenth gear meshes with the tenth gear to form the eighth gear pair.

[0022] The first gear shifter, the second gear shifter, the third gear shifter, and the fourth gear shifter are all synchronizers;

[0023] A clutch is also provided on the input shaft, and the clutch is located between the engine and the third gear shifter and the fourth gear shifter.

[0024] Preferably, the front output shaft, the input shaft, the intermediate shaft, the first motor shaft, and the second motor shaft are arranged parallel to each other and extend relative to the length direction of the vehicle body.

[0025] Preferably, it further includes:

[0026] A torsional damper is disposed between the input shaft and the engine.

[0027] Preferably, it further includes:

[0028] The power battery is connected to the first motor and the second motor.

[0029] Preferably, the front drive axle assembly further has a wheel axle disposed perpendicular to the front output axle, and a wheel is disposed at the end of the wheel axle.

[0030] A second aspect of the present invention provides a vehicle comprising the dual-motor hybrid drive system described in any of the above embodiments.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] The dual-motor hybrid drive system of the present invention has three power sources: an engine, a first motor, and a second motor. By controlling the first, second, third, and fourth gear shifters to be in different engaged or disengaged states, at least one of the first and second motor shafts can be connected to the front output shaft or input shaft in at least one gear output mode. This provides multiple operating modes to meet the needs of vehicle range and different operating conditions. In addition, different operating modes have multiple energy flow control strategies to form multiple gear output modes to meet the driver's all-round driving needs, effectively save fuel consumption, and achieve uninterrupted gear shifting. It has the advantages of good vehicle integration and low carbon emissions.

[0033] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the dual-motor hybrid drive system provided in Embodiment 1 of the present invention;

[0036] Figure 2 This is a schematic diagram illustrating the working principle of the dual-motor hybrid drive system in the first gear of pure electric drive mode 1 provided in Embodiment 1 of the present invention.

[0037] Figure 3 This is a schematic diagram illustrating the working principle of the dual-motor hybrid drive system in the second gear of pure electric drive mode 1 provided in Embodiment 1 of the present invention.

[0038] Figure 4 This is a schematic diagram illustrating the working principle of the dual-motor hybrid drive system in the first gear of pure electric drive mode two, as provided in Embodiment 1 of the present invention.

[0039] Figure 5 This is a schematic diagram illustrating the working principle of the dual-motor hybrid drive system provided in Embodiment 1 of the present invention in the second gear of pure electric drive mode 2.

[0040] Figure 6 The diagram illustrates the working principle of the dual-motor hybrid drive system provided in Embodiment 1 of the present invention in the third gear of pure electric drive mode 2.

[0041] Figure 7 The diagram illustrates the working principle of the dual-motor hybrid drive system provided in Embodiment 1 of the present invention in the fourth gear of pure electric drive mode 2.

[0042] Figure 8 This is a schematic diagram illustrating the working principle of the dual-motor hybrid drive system in engine idle charging mode, as provided in Embodiment 1 of the present invention.

[0043] Figure 9 This is a schematic diagram illustrating the working principle of the dual-motor hybrid drive system in series mode, as provided in Embodiment 1 of the present invention.

[0044] Figure 10 This is a schematic diagram of the dual-motor hybrid drive system provided in Embodiment 2 of the present invention.

[0045] Icons: 1-Front drive axle assembly; 10-Front output shaft; 11-First gear; 12-Wheel axle; 13-Wheel; 20-Intermediate shaft; 21-Third gear; 22-Fourth gear; 23-Fifth gear; 24-Sixth gear; 3-Engine; 30-Input shaft; 31-Seventh gear; 32-Eighth gear; 33-Ninth gear; 34-Tenth gear; 4-First motor; 40-First motor shaft; 41-Eleventh gear; 5-Second motor; 50-Second motor shaft; 51-Second gear; 60-Main motor shaft; 61-Twelfth gear; 62-Thirteenth gear; 71-First gear shifter; 72-Second gear shifter; 73-Third gear shifter; 74-Fourth gear shifter; 75-Clutch; 80-Torsive damper; 90-Power battery. Detailed Implementation

[0046] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0047] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0048] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0049] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0050] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0051] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0052] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0053] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0054] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0055] According to a first aspect of the present invention, a dual-motor hybrid drive system is provided, comprising an intermediate shaft 20, an engine 3, a first motor 4, a second motor 5, and a front drive axle assembly 1.

[0056] The specific structure of the above-described components of the dual-motor hybrid drive system according to this embodiment will be described below.

[0057] Example 1

[0058] In this embodiment, as Figure 1 As shown, a first gear set, a first gear shifter 71, and a second gear shifter 72 are provided on the intermediate shaft 20. The first gear set includes a plurality of gears (i.e., the third gear 21, the fourth gear 22, the fifth gear 23, and the sixth gear 24 described below) spaced apart along the length of the intermediate shaft 20. The first gear shifter 71 and the second gear shifter 72 can engage or disengage with some of the gears in the first gear set.

[0059] Specifically, the first gear set includes a fourth gear 22, a fifth gear 23, and a sixth gear 24 that are loosely mounted on the intermediate shaft 20; the first gear shifter 71 can engage or disengage with the fourth gear 22 and the fifth gear 23; and the second gear shifter 72 can engage or disengage with the sixth gear 24.

[0060] In this embodiment, as Figure 1 As shown, the engine 3 is connected to the input shaft 30. The input shaft 30 is provided with a second gear set, a third gear shifter 73, and a fourth gear shifter 74. The second gear set includes a plurality of gears spaced apart along the length of the input shaft 30 (i.e., the seventh gear 31, the eighth gear 32, the ninth gear 33, and the tenth gear 34 described below). The third gear shifter 73 and the fourth gear shifter 74 can engage or disengage with some of the gears in the second gear set.

[0061] Specifically, the second gear set includes a seventh gear 31, an eighth gear 32, and a ninth gear 33 that are loosely mounted on the input shaft 30; a third gear shifter 73 can engage or disengage with the seventh gear 31; and a fourth gear shifter 74 can engage or disengage with the eighth gear 32 and the ninth gear 33.

[0062] More specifically, in this embodiment, the fourth gear 22 and the seventh gear 31 are meshed to form a third gear pair, the fifth gear 23 and the eighth gear 32 are meshed to form a fourth gear pair, and the sixth gear 24 and the ninth gear 33 are meshed to form a fifth gear pair. This allows the intermediate shaft 20 and the input shaft 30 to be connected by transmission through at least one of the third, fourth, or fifth gear pairs, thus forming multiple energy flow control strategies and generating multiple gear output modes to meet the driver's all-round driving needs and effectively save fuel consumption.

[0063] Furthermore, in this embodiment, such as Figure 1 As shown, the first motor 4 has a first motor shaft 40 that is drively connected to the input shaft 30. Specifically, an eleventh gear 41 is fixedly mounted on the first motor shaft 40, and the second gear set also includes a tenth gear 34 fixedly mounted on the input shaft 30. The tenth gear 34 and the eleventh gear 41 are meshed to form a sixth gear pair, so that the input shaft 30 and the first motor shaft 40 can be drively connected through the sixth gear pair.

[0064] In this embodiment, as Figure 1 As shown, the second motor 5 has a second motor shaft 50 that is drively connected to the intermediate shaft 20. Specifically, a second gear 51 is fixedly mounted on the second motor shaft 50, and the second gear 51 meshes with the sixth gear 24 to form a second gear pair, so that the second motor shaft 50 and the intermediate shaft can be drively connected through the second gear pair.

[0065] In this embodiment, as Figure 1 As shown, the front drive axle assembly 1 has a front output shaft 10 that is driven by the intermediate shaft 20. Specifically, a first gear 11 is fixedly mounted on the front output shaft 10, and the first gear set also includes a third gear 21 fixedly mounted on the intermediate shaft 20. The first gear 11 and the third gear 21 are meshed to form a first gear pair, so that the front output shaft 10 and the intermediate shaft 20 can be driven by the first gear pair.

[0066] Furthermore, in this embodiment, such as Figure 1 As shown, the front drive axle assembly 1 also has a wheel axle 12 arranged perpendicular to the front output shaft 10. The wheel axle 12 consists of two half shafts and extends along the width direction of the vehicle body. A wheel 13 is provided at the end of the wheel axle 12.

[0067] This application controls the first gear shifter 71, the second gear shifter 72, the third gear shifter 73, and the fourth gear shifter 74 to be in different engaged or disengaged states, so that at least one of the first motor shaft 40 and the second motor shaft 50 can be connected to the front output shaft 10 for transmission, thereby forming a variety of different working modes to meet the needs of vehicle range and different working conditions. Moreover, different working modes have multiple gear output methods, thereby meeting the driver's all-round driving needs and effectively saving fuel consumption.

[0068] In this embodiment, the first gear shifter 71, the second gear shifter 72, the third gear shifter 73, and the fourth gear shifter 74 are all clutches.

[0069] Furthermore, in this embodiment, as Figure 1As shown, the front output shaft 10, input shaft 30, intermediate shaft 20, first motor shaft 40 and second motor shaft 50 are arranged parallel to each other and extend relative to the length of the vehicle body, so that the dual-motor hybrid drive system is formed in a longitudinal configuration, which effectively solves the problem of high fuel consumption in existing longitudinal vehicles.

[0070] Furthermore, in this embodiment, such as Figure 1 As shown, the dual-motor hybrid drive system also includes a torsional damper 80 disposed between the input shaft 30 and the engine 3, so that the engine 3 is connected to the input shaft 30 via the torsional damper 80, and the driving force output by the engine 3 is transmitted to the input shaft 30 via the torsional damper 80. This can reduce the torsional stiffness of the joint between the crankshaft of the engine 3 and the input shaft 30, alleviate the torsional impact load on the input shaft 30 under unsteady conditions, and improve the smoothness of the connection between the third gear shifter 73 and the fourth gear shifter 74 on the input shaft 30.

[0071] In this embodiment, as Figure 1 As shown, the dual-motor hybrid drive system also includes a power battery 90 connected to the first motor 4 and the second motor 5.

[0072] Example 2

[0073] The structure of the dual-motor hybrid drive system in this embodiment is shown in [reference]. Figure 10 As shown. The difference between Embodiment 2 and Embodiment 1 is that the second gear 51 is not provided, and the first gear shifter 71, the second gear shifter 72, the third gear shifter 73 and the fourth gear shifter 74 are all synchronizers.

[0074] Furthermore, in this embodiment, the first motor shaft 40 and the second motor shaft 50 are coaxially arranged to form a total motor shaft 60; the total motor shaft 60 is fixedly connected to the second motor 5, and the first motor 4 is loosely mounted on the total motor shaft 60. The dual-motor hybrid drive system of this embodiment also includes a clutch 75 disposed on the input shaft 30. The clutch 75 is disposed between the engine 3 and the third gear shifter 73 and the fourth gear shifter 74 to control the engagement or disengagement of the engine 3 with the third gear shifter 73 and the fourth gear shifter 74; when the clutch 75 is disengaged, the engine 3 does not work, so as to realize the parallel drive of the first motor 4 and the second motor 5.

[0075] Specifically, a twelfth gear 61 is fixedly installed on the main motor shaft 60, and a thirteenth gear 62 is also loosely fitted on the main motor shaft 60. The thirteenth gear 62 is connected to the first motor 4. The twelfth gear 61 meshes with the ninth gear 33 to form a seventh gear pair. The thirteenth gear 62 meshes with the tenth gear 34 to form an eighth gear pair.

[0076] The driving modes of the dual-motor hybrid drive system of this application include: pure electric drive mode, engine direct drive mode, engine idle charging mode, engine power generation mode, parallel drive mode, series drive mode, and energy recovery mode. The working principles of different modes are explained below using the scheme of Embodiment 1 as an example.

[0077] The pure electric drive mode includes mode one and mode two.

[0078] In the pure electric drive mode one, neither the engine 3 nor the first motor 4 operates, and the second motor 5 drives the vehicle. The pure electric drive mode one includes two gear control methods.

[0079] Specifically, the working principle of pure electric drive mode one in the first gear is described in [reference needed]. Figure 2 As shown, the second gear shifter 72 is in the engaged state, while the first gear shifter 71, the third gear shifter 73, and the fourth gear shifter 74 are all in the disengaged state; the power transmission path is: second motor 5 → second motor shaft 50 → second gear pair → second gear shifter 72 → intermediate shaft 20 → first gear pair → front output shaft 10 → front drive axle assembly 1 → wheel 13.

[0080] The working principle of pure electric drive mode one in second gear is described in [reference needed]. Figure 3 As shown, the first gear shifter 71 is in the engaged state, while the second gear shifter 72, the third gear shifter 73, and the fourth gear shifter 74 are all in the disengaged state; the power transmission path is: second motor 5 → second motor shaft 50 → second gear pair → fifth gear pair → fourth gear pair → first gear shifter 71 → intermediate shaft 20 → first gear pair → front output shaft 10 → front drive axle assembly 1 → wheel 13.

[0081] In pure electric drive mode two, neither engine 3 nor the second motor 5 operates; the first motor 4 drives the vehicle. Pure electric drive mode two includes four gear control modes.

[0082] Specifically, the working principle of pure electric drive mode two in the first gear is described in [link to documentation]. Figure 4 As shown, the second gear shifter 72 and the third gear shifter 73 are engaged, while the first gear shifter 71 and the fourth gear shifter 74 are disengaged. The power transmission path is as follows: first motor 4 → first motor shaft 40 → sixth gear pair → input shaft 30 → third gear shifter 73 → third gear pair → fourth gear pair → fifth gear pair → second gear shifter 72 → intermediate shaft 20 → first gear pair → front output shaft 10 → front drive axle assembly 1 → wheel 13.

[0083] The working principle of pure electric drive mode 2 in second gear is described in [link to documentation]. Figure 5As shown, the first gear shifter 71 and the third gear shifter 73 are engaged, while the second gear shifter 72 and the fourth gear shifter 74 are disengaged. The power transmission path is as follows: first motor 4 → first motor shaft 40 → sixth gear pair → input shaft 30 → third gear shifter 73 → third gear pair → first gear shifter 71 → intermediate shaft 20 → first gear pair → front output shaft 10 → front drive axle assembly 1 → wheel 13.

[0084] The working principle of pure electric drive mode 2 in third gear is described in [link to documentation]. Figure 6 As shown, the second gear shifter 72 and the fourth gear shifter 74 are engaged, while the first gear shifter 71 and the third gear shifter 73 are disengaged. The power transmission path is as follows: first motor 4 → first motor shaft 40 → sixth gear pair → fourth gear shifter 74 → fifth gear pair → second gear shifter 72 → intermediate shaft 20 → first gear pair → front output shaft 10 → front drive axle assembly 1 → wheel 13.

[0085] The working principle of pure electric drive mode 2 in fourth gear is described in [link to documentation]. Figure 7 As shown, the first gear shifter 71 and the fourth gear shifter 74 are engaged, while the second gear shifter 72 and the third gear shifter 73 are disengaged. The power transmission path is as follows: first motor 4 → first motor shaft 40 → sixth gear pair → fourth gear shifter 74 → fourth gear pair → first gear shifter 71 → intermediate shaft 20 → first gear pair → front output shaft 10 → front drive axle assembly 1 → wheel 13.

[0086] In the engine direct drive mode, engine 3 is working, while the first motor 4 and the second motor 5 are not working. The driving force output by engine 3 is transmitted to the input shaft 30. There are four gears. For the specific gear control method, please refer to pure electric drive mode two, which will not be repeated here.

[0087] When the car is parked and the battery is depleted, the engine idle charging mode can be activated. For details on engine idle charging mode, please refer to [link / reference needed]. Figure 8 As shown, engine 3 and the first generator are working, while the second engine 3 is not working. The third gear shifter 73 and the fourth gear shifter 74 are engaged, while the first gear shifter 71 and the second gear shifter 72 are disengaged. The power transmission path is: engine 3 → torsional damper 80 → input shaft 30 → sixth gear pair → first motor shaft 40 → first motor 4 → power battery 90.

[0088] When a vehicle is traveling at high speed and needs high torque to overtake, a parallel drive mode can be used.

[0089] Specifically, there are four parallel drive modes: in parallel drive mode one, engine 3 drives, first motor 4 drives, and second motor 5 does not drive; in parallel drive mode two, engine 3 drives, first motor 4 does not drive, and second motor 5 drives; in parallel drive mode three, engine 3 drives, first motor 4 drives, and second motor 5 drives; in parallel drive mode four, engine 3 does not drive, first motor 4 drives, and second motor 5 drives. In this way, the drive mode can be entered by controlling the corresponding power components according to different working conditions.

[0090] The working principle of the series drive mode is described in [reference]. Figure 9 As shown, in the series drive mode, engine 3 drives the engine, first motor 4 is used for power generation, and second motor 5 drives the engine. Second gear shifter 72 is engaged, while first gear shifter 71, third gear shifter 73, and fourth gear shifter 74 are all disengaged. The power transmission path is: engine 3 → torsional damper 80 → input shaft 30 → sixth gear pair → first motor shaft 40 → first motor 4 → power battery 90 → second motor 5 → second motor shaft 50 → second gear pair → second gear shifter 72 → intermediate shaft 20 → first gear pair → front output shaft 10 → front drive axle assembly 1 → wheel 13.

[0091] When a car decelerates, coasts, or brakes, it can recover mechanical energy from the wheels, converting it into electrical energy and storing it in the battery, thus improving fuel economy. There are two energy recovery modes. In mode one, the engine 3 and the first motor 4 are not operating, while the second motor 5 generates electricity. The engagement and disengagement of the gear shifters are the same as in pure electric drive mode one, but the power transmission path is reversed. Mechanical energy is transmitted from the front drive axle assembly 1, converted into electrical energy by the second motor 5, and finally stored in the power battery 90. In mode two, the engine 3 is not operating, the first motor 4 generates electricity, and the second motor 5 is not operating. The engagement and disengagement of the gear shifters are the same as in pure electric drive mode two, but the power transmission path is reversed. Mechanical energy is transmitted from the differential assembly, converted into electrical energy by the first motor 4, and finally stored in the power battery 90.

[0092] The dual-motor hybrid drive system of the present invention has a simple, compact, and highly integrated structure, driven by three power sources: an engine, a first motor, and a second motor. By controlling the first, second, third, and fourth gear shifters to be in different engaged or disengaged states, at least one of the first and second motor shafts can be connected to the front output shaft or input shaft in at least one gear output mode. This provides multiple operating modes to meet the needs of vehicle range and different operating conditions. In addition, different operating modes have multiple energy flow control strategies to form multiple gear output modes, meeting the driver's all-round driving needs, effectively saving fuel consumption, and achieving uninterrupted gear shifting. It also has the advantages of good vehicle integration and low carbon emissions.

[0093] A second aspect of the present invention provides a vehicle including the aforementioned dual-motor hybrid drive system, which can effectively reduce fuel consumption through multi-gear control; in addition, the vehicle can realize multiple working modes such as pure electric drive, engine drive, parallel drive, series drive, engine power generation, energy recovery, and idle power generation, so that the vehicle can be used in various working conditions and meet the requirements of driving range, power and economy.

[0094] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A dual-motor hybrid drive system, characterized by, include: The intermediate shaft is provided with a first gear set, a first gear shifter, and a second gear shifter. The first gear shifter and the second gear shifter can engage or disengage with some gears in the first gear set. The input shaft is equipped with a second gear set, a third gear shifter, and a fourth gear shifter. The third gear shifter and the fourth gear shifter can engage or disengage with some gears in the second gear set. The engine is connected to the input shaft; A first motor has a first motor shaft that is drively connected to the input shaft; The second motor has a second motor shaft that is drively connected to the intermediate shaft; The front drive axle assembly has a front output shaft that is drive-connected to the intermediate shaft; By controlling the first gear shifter, the second gear shifter, the third gear shifter, and the fourth gear shifter to be in different engaged or disengaged states, at least one of the first motor shaft and the second motor shaft can be connected to the front output shaft or the input shaft in at least one gear output mode. The first gear set includes a fourth gear, a fifth gear, and a sixth gear loosely mounted on the intermediate shaft; the first gear shifting component can engage or disengage with the fourth gear and the fifth gear; the second gear shifting component can engage or disengage with the sixth gear. The second gear set includes a seventh gear, an eighth gear, and a ninth gear loosely mounted on the input shaft, and a tenth gear fixedly mounted on the input shaft; the third gear shifting component can engage or disengage with the seventh gear; The fourth gear shifter can engage or disengage with the eighth gear and the ninth gear; The fourth gear and the seventh gear mesh to form a third gear pair; The fifth gear and the eighth gear mesh to form a fourth gear pair; The sixth gear and the ninth gear mesh to form a fifth gear pair; A first gear is fixedly mounted on the front output shaft. The first gear set also includes a third gear fixedly mounted on the intermediate shaft. The first gear and the third gear mesh together to form a first gear pair. A second gear is fixedly mounted on the second motor shaft, and the second gear meshes with the sixth gear to form a second gear pair; An eleventh gear is fixedly mounted on the first motor shaft, and the tenth gear and the eleventh gear mesh to form a sixth gear pair; The front output shaft, the input shaft, the intermediate shaft, the first motor shaft, and the second motor shaft are arranged parallel to each other and extend relative to the length direction of the vehicle body. The front drive axle assembly also has a wheel axle disposed perpendicular to the front output axle, and a wheel is disposed at the end of the wheel axle.

2. The dual-motor hybrid drive system of claim 1, wherein, Also includes: A torsional damper is disposed between the input shaft and the engine.

3. The dual-motor hybrid drive system of claim 1, wherein, Also includes: The power battery is connected to the first motor and the second motor.

4. A vehicle characterized by comprising: The dual-motor hybrid drive system includes any one of claims 1 to 3.

Images