Electric drive assembly, control method of electric drive assembly and vehicle

Abstract

The invention provides an electric drive assembly, a control method of the electric drive assembly and a vehicle, and the electric drive assembly comprises a drive motor which is provided with a motor shaft which is used for driving an output half shaft to rotate; and the first braking mechanism and the second braking mechanism are used for selectively braking the motor shaft respectively. According to the electric drive assembly, the overall structure of the electric drive assembly can be simplified, the manufacturing cost of the electric drive assembly can be reduced, the occupied space of the electric drive assembly can be reduced, the light weight of a vehicle can be improved, the endurance performance of the vehicle can be improved, the first brake mechanism and the second brake mechanism can selectively brake the motor shaft, and the service life of the vehicle can be prolonged. Therefore, various braking effects can be achieved, the braking effect of the electric drive assembly is improved, a vehicle can adapt to different use scenes, the use reliability of the electric drive assembly can be guaranteed, the use safety is improved, the use experience of a user is guaranteed, the use effect is better, and the application range is wider.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle manufacturing, and more particularly to an electric drive assembly, a control method for the electric drive assembly, and a vehicle. Background Art

[0002] With the development of the national economy and the continuous improvement of living standards, vehicles have become increasingly important in daily travel. Aspects such as the use safety, manufacturing cost, and endurance performance of vehicles need to be emphasized during vehicle production. Existing vehicles can drive the wheels to rotate through an electric drive assembly to drive the vehicle forward. However, the existing electric drive assembly has a complex structure, occupies a large space, affects the overall size of the vehicle, and has limited braking ability, making it difficult to adapt to the complex usage scenarios of passenger vehicles, affecting the use safety, and there is room for improvement. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides an electric drive assembly with a simple structure, low manufacturing cost, which can reduce the occupied space, improve the vehicle lightweight, and can improve the braking performance, enrich the vehicle usage scenarios, ensure the use safety, and improve the user experience.

[0004] The electric drive assembly according to an embodiment of the present invention includes: a drive motor provided with a motor shaft for driving an output half shaft to rotate; a first braking mechanism and a second braking mechanism for selectively braking the motor shaft respectively.

[0005] The electric drive assembly according to an embodiment of the present invention directly brakes the motor shaft through the first braking mechanism and the second braking mechanism, which can simplify the overall structure of the electric drive assembly, thereby reducing the manufacturing cost of the electric drive assembly, reducing the occupied space of the electric drive assembly to improve the vehicle lightweight, and then improving the endurance performance of the vehicle. Moreover, the first braking mechanism and the second braking mechanism can selectively brake the motor shaft respectively, thereby realizing various braking effects, improving the braking effect of the electric drive assembly, enabling the vehicle to adapt to different usage scenarios, and ensuring the use reliability of the electric drive assembly to improve the use safety and guarantee the user experience, with better use effects and a wider application range.

[0006] In the electric drive assembly according to some embodiments of the present invention, both ends of the motor shaft extend to the opposite sides of the drive motor, and the first braking mechanism and the second braking mechanism are respectively installed at both ends of the motor shaft.

[0007] In the electric drive assembly according to some embodiments of the present invention, the first braking mechanism includes a first brake caliper and a first brake disc, the first brake disc is connected to one end of the motor shaft, and the first brake caliper is adapted to clamp the first brake disc when the vehicle brakes;

[0008] And / or, the second braking mechanism includes a second brake caliper and a second brake disc. The second brake disc is connected to the other end of the motor shaft, and the second brake caliper is adapted to clamp the second brake disc when the vehicle brakes.

[0009] The electric drive assembly according to some embodiments of the present invention further includes a transmission structure, and the motor shaft is power-connected to the output half shaft through the transmission structure.

[0010] In the electric drive assembly according to some embodiments of the present invention, the transmission structure includes a driving gear, an intermediate gear, and an output gear. The driving gear is disposed outside the motor shaft, the output gear is disposed outside the output half shaft, and the intermediate gear meshes with the driving gear and the output gear respectively.

[0011] In the electric drive assembly according to some embodiments of the present invention, the tooth number ratio between the driving gear and the intermediate gear is set to be different from the tooth number ratio between the intermediate gear and the output gear.

[0012] In the electric drive assembly according to some embodiments of the present invention, in the projection along the up-down direction, the axes of the motor shaft, the intermediate gear, and the output half shaft are arranged in parallel at intervals in the front-rear direction.

[0013] The electric drive assembly according to some embodiments of the present invention further includes an electric drive housing, and the drive motor and the transmission structure are both disposed in the electric drive housing;

[0014] Wherein, the end of the motor shaft extends out of the electric drive housing to be connected to the first braking mechanism and the second braking mechanism, and / or the end of the output half shaft extends out of the electric drive housing to be connected to a wheel.

[0015] The present invention also proposes a control method for an electric drive assembly.

[0016] The control method for an electric drive assembly according to an embodiment of the present invention is applicable to the electric drive assembly described in any one of the above, and the control method includes:

[0017] Detect the braking state of the wheel end;

[0018] When the braking state is normal braking, obtain the braking intensity requirement;

[0019] According to the braking intensity requirement, control the first braking mechanism and the second braking mechanism to brake the motor shaft with a target braking number.

[0020] The control method of the electric drive assembly according to some embodiments of the present invention, the controlling the first braking mechanism and the second braking mechanism to brake the motor shaft with a target braking number according to the braking intensity requirement includes:

[0021] When the braking intensity requirement is a large braking intensity requirement, controlling the first braking mechanism and the second braking mechanism to jointly brake the motor shaft;

[0022] And when the braking intensity requirement is not a large braking intensity requirement, controlling the first braking mechanism to brake the motor shaft alone.

[0023] The control method of the electric drive assembly according to some embodiments of the present invention, the controlling the first braking mechanism and the second braking mechanism to jointly brake the motor shaft includes:

[0024] Controlling the first braking mechanism and the second braking mechanism to brake the motor shaft with the same braking force.

[0025] The control method of the electric drive assembly according to some embodiments of the present invention, the control method further includes:

[0026] When the braking state is abnormal braking, determining whether the first braking mechanism fails;

[0027] When the first braking mechanism fails, controlling the second braking mechanism to brake the motor shaft;

[0028] And when the first braking mechanism does not fail, controlling the first braking mechanism to brake the motor shaft.

[0029] The control method of the electric drive assembly according to some embodiments of the present invention, the control method further includes:

[0030] Obtaining the braking force distribution requirements of the front wheels and the rear wheels;

[0031] According to the braking force distribution requirements, controlling the first braking mechanism and / or the second braking mechanism corresponding to the front wheels and the rear wheels to brake the corresponding motor shafts with a target braking force.

[0032] The control method of the electric drive assembly according to some embodiments of the present invention, the control method further includes:

[0033] Controlling the first braking mechanism and / or the second braking mechanism corresponding to the two front wheels to brake the corresponding motor shafts with the same target braking force;

[0034] Furthermore, the first braking mechanism and / or the second braking mechanism corresponding to the two rear wheels are controlled to brake the corresponding motor shaft with the same target braking force.

[0035] The present invention also provides a vehicle.

[0036] A vehicle according to an embodiment of the present invention includes any one of the above-mentioned electric drive assemblies.

[0037] The control method of the electric drive assembly, the vehicle, and the above-mentioned electric drive assembly have the same advantages as those of the prior art and will not be described in detail here.

[0038] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0040] Figure 1 is a schematic structural diagram of an electric drive assembly and a wheel according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the electric drive assembly according to an embodiment of the present invention. Figure 1 ;

[0042] Figure 3 This is a schematic diagram of the structure of the electric drive assembly according to an embodiment of the present invention. Figure 2 ;

[0043] Figure 4 is a schematic diagram of a partial structure of an electric drive assembly according to an embodiment of the present invention;

[0044] Figure 5 This is a flow chart of a control method for an electric drive assembly according to an embodiment of the present invention. Figure 1 ;

[0045] Figure 6 This is a flow chart of a control method for an electric drive assembly according to an embodiment of the present invention. Figure 2 ;

[0046] Figure 7 This is a flow chart of a control method for an electric drive assembly according to an embodiment of the present invention. Figure 3 ;

[0047] Figure 8 This is a flow chart of a control method for an electric drive assembly according to an embodiment of the present invention. Figure 4 ;

[0048] Figure 9Flow schematic of the control method of the electric drive assembly according to an embodiment of the present invention Figure 5 ;

[0049] Figure 10 Flow schematic of the control method of the electric drive assembly according to an embodiment of the present invention Figure 6 。

[0050] Reference numerals:

[0051] Electric drive assembly 100, wheel 101,

[0052] Electric drive housing 1, drive motor 2, motor shaft 21, output half shaft 3,

[0053] First braking mechanism 4, first brake caliper 41, first brake disc 42, second braking mechanism 5, second brake caliper 51, second brake disc 52,

[0054] Transmission structure 6, driving gear 61, intermediate gear 62, output gear 63. Detailed implementation manners

[0055] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as a limitation of the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] Unless otherwise specified, the front-back direction in this application is the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction is the transverse direction of the vehicle, i.e., the Y direction; and the up-down direction is the vertical direction of the vehicle, i.e., the Z direction.

[0059] The following refers to Figures 1 - 4 to describe the electric drive assembly 100 according to an embodiment of the present invention. It has a simple structure, low manufacturing cost, can reduce the occupied space, improve the vehicle lightweight, and can improve the braking performance, enrich the vehicle usage scenarios, ensure the usage safety, and enhance the user experience.

[0060] As Figures 1 - 4 shown, the electric drive assembly 100 according to an embodiment of the present invention includes: a drive motor 2, a first braking mechanism 4, and a second braking mechanism 5.

[0061] The drive motor 2 is provided with a motor shaft 21. The motor shaft 21 is used to drive the output half shaft 3 to rotate, and the first braking mechanism 4 and the second braking mechanism 5 are used to selectively brake the motor shaft 21 respectively.

[0062] Among them, the electric drive assembly 100 is also called the electric drive axle power assembly, which is a combination of the drive motor 2 and gears, etc. The electric drive assembly 100 can convert high-voltage electricity into driving kinetic energy, and then transmit the driving kinetic energy to the wheel 101 to drive the vehicle to run. The electric drive assembly 100 can power-connect the rotor of the drive motor 2 and the output half shaft 3, and the rotor of the drive motor 2 can reduce the rotational speed through a fixed gear ratio gear set and then transmit it to the output half shaft 3. At the same time, the torque output by the motor can be amplified through the gear set to ensure the vehicle operation reliability and improve the vehicle operation performance.

[0063] Specifically, the electric drive assembly 100 is provided with a drive motor 2. The drive motor 2 can provide power for the electric drive assembly 100, and the drive motor 2 is provided with a motor shaft 21. When the drive motor 2 operates, it can drive the motor shaft 21 to rotate, so as to output the power outside the drive motor 2 through the motor shaft 21. The electric drive assembly 100 is also provided with an output half shaft 3. The output half shaft 3 can be power-connected to the motor shaft 21, that is, when the drive motor 2 operates, the drive motor 2 can drive the output half shaft 3 to rotate through the motor shaft 21. The output half shaft 3 can be connected to the wheel 101, and then can drive the wheel 101 to rotate, ensuring the vehicle operation reliability.

[0064] Further, the electric drive assembly 100 is also provided with a first braking mechanism 4 and a second braking mechanism 5. Both the first braking mechanism 4 and the second braking mechanism 5 can be connected to the motor shaft 21, so that the first braking mechanism 4 and the second braking mechanism 5 are used to selectively brake the motor shaft 21 respectively. That is, when the driving motor 2 is running and the motor shaft 21 is rotating, only the first braking mechanism 4 can be used to brake the motor shaft 21 to block the power output from the motor shaft 21 to the output half shaft 3. Only the second braking mechanism 5 can also be used to brake the motor shaft 21 to block the power output from the motor shaft 21 to the output half shaft 3. The first braking mechanism 4 and the second braking mechanism 5 can also be used simultaneously to brake the motor shaft 21 to block the power output from the motor shaft 21 to the output half shaft 3, improving the flexibility of use.

[0065] In this way, the motor shaft 21 can be directly braked by the first braking mechanism 4 and the second braking mechanism 5, thereby reducing the setting of structures such as the speed reducer, simplifying the internal structure of the electric drive assembly 100, reducing the setting cost. Moreover, since the first braking mechanism 4 and the second braking mechanism 5 are directly connected to the motor shaft 21, the integration degree of the electric drive assembly 100 can be improved, thereby reducing the space occupied by the electric drive assembly 100 to improve the vehicle lightweight, and further improving the vehicle's endurance performance and the user's use experience.

[0066] In addition, two braking mechanisms are provided to selectively brake the motor shaft 21, so that when one of the first braking mechanism 4 and the second braking mechanism 5 fails, the other can operate normally, thereby ensuring the reliability of braking the motor shaft 21 to improve the use safety of the vehicle. And when a large braking force is required for the motor shaft 21, the first braking mechanism 4 and the second braking mechanism 5 can be operated simultaneously, thereby achieving various braking effects, improving the braking effect of the electric drive assembly 100, enabling the vehicle to adapt to different use scenarios, and improving the user's use experience.

[0067] For the electric drive assembly 100 according to the embodiment of the present invention, by directly braking the motor shaft 21 through the first braking mechanism 4 and the second braking mechanism 5, the overall structure of the electric drive assembly 100 can be simplified, thereby reducing the manufacturing cost of the electric drive assembly 100, reducing the space occupied by the electric drive assembly 100 to improve the vehicle lightweight, and further improving the vehicle's endurance performance. And the first braking mechanism 4 and the second braking mechanism 5 can selectively brake the motor shaft 21 respectively, thereby achieving various braking effects, improving the braking effect of the electric drive assembly 100, enabling the vehicle to adapt to different use scenarios, and ensuring the use reliability of the electric drive assembly 100 to improve the use safety and ensure the user's use experience, with better use effects and wider application ranges.

[0068] In some embodiments, both ends of the motor shaft 21 extend to the two opposite sides of the driving motor 2, and the first braking mechanism 4 and the second braking mechanism 5 are respectively installed at both ends of the motor shaft 21.

[0069] Specifically, the driving motor 2 is provided with a motor shaft 21 to output power outside the driving motor 2, and as Figures 1 - 2 shown, both ends of the motor shaft 21 extend outside the driving motor 2, so that the first braking mechanism 4 and the second braking mechanism 5 can be respectively installed at both ends of the motor shaft 21, that is, the first braking mechanism 4 can brake one end of the motor shaft 21 to brake the driving motor 2, and the second braking mechanism 5 can brake the other end of the motor shaft 21 to brake the driving motor 2, thereby ensuring the reliability of braking the driving motor 2, improving the flexibility of use of the first braking mechanism 4 and the second braking mechanism 5, enriching the usage scenarios of the electric drive assembly 100, and meeting different usage requirements.

[0070] Furthermore, both ends of the motor shaft 21 extend toward the two opposite sides of the driving motor 2 respectively, so that the first braking mechanism 4 and the second braking mechanism 5 are respectively installed on the two opposite sides of the driving motor 2, and further, the first braking mechanism 4 can be arranged away from the second braking mechanism 5, so as to avoid the situation that when one of the first braking mechanism 4 and the second braking mechanism 5 has a problem, it will affect the other, ensuring the operating reliability of the electric drive assembly 100, and further improving the vehicle use safety.

[0071] In some embodiments, the first braking mechanism 4 includes a first brake caliper 41 and a first brake disc 42. The first brake disc 42 is connected to one end of the motor shaft 21, and the first brake caliper 41 is adapted to clamp the first brake disc 42 when the vehicle brakes.

[0072] Specifically, the first braking mechanism 4 is installed at one end of the motor shaft 21, and as Figure 2 shown, the first braking mechanism 4 is provided with a first brake caliper 41 and a first brake disc 42. The first brake disc 42 can be sleeved outside one end of the motor shaft 21 and is fixedly connected to the outer peripheral wall of the motor shaft 21, so that when the motor shaft 21 rotates, the first brake disc 42 can also rotate together, and when the first brake disc 42 stops rotating, it can brake the motor shaft 21. The first brake disc 42 is clamped inside the first brake caliper 41.

[0073] When the vehicle is running normally, there is a gap between the first brake caliper 41 and the first brake disc 42, and when the vehicle brakes, the first brake caliper 41 can clamp the first brake disc 42, so that the first brake disc 42 decelerates under the action of friction and clamping force to drive the motor shaft 21 to decelerate, thereby reducing or blocking the power transmitted from the motor shaft 21 to the output half shaft 3 and ensuring the reliability of braking the driving motor 2.

[0074] In some other embodiments, the second braking mechanism 5 includes a second brake caliper 51 and a second brake disc 52. The second brake disc 52 is connected to the other end of the motor shaft 21, and the second brake caliper 51 is adapted to clamp the second brake disc 52 when the vehicle brakes.

[0075] Specifically, the second braking mechanism 5 is installed at the other end of the motor shaft 21, and as Figure 2 shown, the second braking mechanism 5 is provided with a second brake caliper 51 and a second brake disc 52. The second brake disc 52 can be sleeved outside the other end of the motor shaft 21 and is fixedly connected to the outer peripheral wall of the motor shaft 21, so that when the motor shaft 21 rotates, the second brake disc 52 can also rotate together, and when the second brake disc 52 stops rotating, the motor shaft 21 can be braked. The second brake disc 52 is clamped inside the second brake caliper 51.

[0076] When the vehicle is running normally, there is a gap between the second brake caliper 51 and the second brake disc 52, and when the vehicle brakes, the second brake caliper 51 can clamp towards the second brake disc 52, so that the second brake disc 52 decelerates under the action of friction and clamping force to drive the motor shaft 21 to decelerate, and further the power transmitted from the motor shaft 21 to the output half shaft 3 can be reduced or blocked, ensuring the reliability of braking the drive motor 2.

[0077] In some embodiments, the electric drive assembly 100 further includes a transmission structure 6. The motor shaft 21 is power-connected to the output half shaft 3 through the transmission structure 6.

[0078] Specifically, the motor shaft 21 can output power to the output half shaft 3 to drive the wheel 101 to rotate, and as Figure 4 shown, the electric drive assembly 100 is further provided with a transmission structure 6. The motor shaft 21 can be power-connected to the output half shaft 3 through the transmission structure ⑥, that is, when the motor shaft 21 rotates, it can drive the transmission structure 6 to operate, and then transmit the power to the output half shaft 3 through the transmission structure 6 to drive the output half shaft 3 through the transmission structure 6, and further the magnitude and transmission direction of the driving force of the motor shaft 21 can be changed through the transmission structure 6 to meet different usage requirements and enrich the usage scenarios of the electric drive assembly 100.

[0079] In some embodiments, the transmission structure 6 includes a driving gear 61, an intermediate gear 62 and an output gear 63. The driving gear 61 is arranged outside the motor shaft 21, the output gear 63 is arranged outside the output half shaft 3, and the intermediate gear 62 meshes with the driving gear 61 and the output gear 63 respectively.

[0080] Specifically, the motor shaft 21 can output power to the output half shaft 3 through the transmission structure 6, and as Figure 3As shown, the transmission structure 6 is provided with a driving gear 61, an intermediate gear 62 and an output gear 63. The driving gear 61 can be sleeved outside the motor shaft 21 and is fixedly connected to the outer peripheral wall of the motor shaft 21. When the motor shaft 21 rotates, the driving gear 61 can also rotate together. Thus, the power of the motor shaft 21 can be output through the driving gear 61. The output gear 63 is sleeved outside the output half shaft 3 and is fixedly connected to the outer peripheral wall of the output half shaft 3. When the output gear 63 rotates, the output half shaft 3 can be driven to rotate, and then the wheel 101 can be driven to rotate.

[0081] Further, the intermediate gear 62 meshes with the driving gear 61 and the output gear 63 respectively. That is, when the driving gear 61 rotates, the intermediate gear 62 can be driven to rotate, and then the output gear 63 can be driven to rotate. The intermediate gear 62 can reduce the output speed of the motor shaft 21, and when the driving force is transmitted to the output half shaft 3, the output torque of the output half shaft 3 can be increased. The output gear 63 rotates coaxially with the output half shaft 3, and the output half shaft 3 is connected to the wheel center of the wheel 101. As the output half shaft 3 rotates, the wheel 101 can be driven to rotate, thereby realizing the running of the whole vehicle and ensuring the reliability of vehicle operation.

[0082] In some embodiments, the tooth number ratio between the driving gear 61 and the intermediate gear 62 is set different from the tooth number ratio between the intermediate gear 62 and the output gear 63.

[0083] Specifically, when the motor shaft 21 rotates, the driving gear 61 can be driven to rotate. The driving gear 61 meshes and drives with the intermediate gear 62, so that when the driving gear 61 rotates, the intermediate gear 62 can be driven to rotate. And the intermediate gear 62 meshes and drives with the output gear 63. Thus, when the intermediate gear 62 rotates, the output gear 63 can be driven to rotate to drive the output half shaft 3 to rotate. And the tooth number ratio between the driving gear 61 and the intermediate gear 62 is set different from the tooth number ratio between the intermediate gear 62 and the output gear 63, so that when the driving gear 61 transmits power to the intermediate gear 62 and the intermediate gear 62 transmits power to the output gear 63, the magnitude of the driving force can be changed.

[0084] Further, when the driving motor 2 runs, its speed is higher than the actual required output speed. By setting the tooth number ratio between the driving gear 61 and the intermediate gear 62 different from the tooth number ratio between the intermediate gear 62 and the output gear 63, the speed of the driving motor 2 can be reduced through the transmission structure 6, so that the output speed of the driving motor 2 can meet the actual speed required for the rotation of the wheel 101, ensuring the reliability of vehicle operation. Moreover, the structure is simple, the setting cost is low, and the power transmission path can be optimized, reserving sufficient installation space for the first braking mechanism 4 and the second braking mechanism 5 and ensuring the reasonable utilization of space.

[0085] In some embodiments, in the projection along the up-down direction, the axes of the motor shaft 21, the intermediate gear 62, and the output half shaft 3 are arranged parallel to each other and spaced apart in the front-rear direction.

[0086] Specifically, the motor shaft 21 extends on both sides of the driving motor 2 away from each other, and in the projection along the up-down direction, the axes of the motor shaft 21 and the output half shaft 3 are arranged parallel to each other and spaced apart in the front-rear direction. The intermediate gear 62 is meshed between the driving gear 61 and the output gear 63, so that the axis of the intermediate gear 62 is also parallel to and spaced apart from the axes of the motor shaft 21 and the output half shaft 3, and in the projection along the up-down direction, the axis of the intermediate gear 62 is located between the axes of the motor shaft 21 and the output half shaft 3.

[0087] X In this way, the driving motor 2, the intermediate gear 62, and the output half shaft 3 are arranged along the front-rear direction of the vehicle, which can reduce the space occupied by the vehicle in the left-right direction. And by transmitting power through the intermediate gear 62, the flexibility of the position adjustment of the driving motor 2 and the output half shaft 3 in the front-rear direction and the left-right direction of the vehicle can be improved. Furthermore, the adjustability of the installation and configuration of the electric drive assembly 100 can be improved, ensuring that the driving motor 2 can be adaptively installed at various positions according to the requirements of the overall vehicle layout.

[0088] In some embodiments, the electric drive assembly 100 further includes an electric drive housing 1, and the driving motor 2 and the transmission structure 6 are both arranged inside the electric drive housing 1.

[0089] Specifically, as shown, the electric drive assembly 100 is further provided with an electric drive housing 1. An installation space is formed inside the electric drive housing 1, and the driving motor 2 and the transmission structure 6 can be arranged in the installation space of the electric drive housing 1, so that the electric drive housing 1 can protect the driving motor 2 and the transmission structure 6. And the intermediate gear 62 of the transmission structure 6 can be rotatably installed in the electric drive housing 1 through a rotating shaft or a rotating bearing, etc., thereby ensuring the operation reliability of the driving motor 2 and the transmission structure 6.

[0090] In addition, installing both the driving motor 2 and the transmission structure 6 in the same electric drive housing 1 can improve the overall integration of the electric drive assembly 100 and facilitate the installation of the electric drive assembly 100 in the vehicle body.

[0091] Wherein, the end of the motor shaft 21 extends out of the electric drive housing 1 to be connected to the first braking mechanism 4 and the second braking mechanism 5, and / or the end of the output half shaft 3 extends out of the electric drive housing 1 to be connected to the wheel 101. That is, only the end of the motor shaft 21 can extend out of the electric drive housing 1 to be connected to the first braking mechanism 4 and the second braking mechanism 5, or only the end of the output half shaft 3 can extend out of the electric drive housing 1 to be connected to the wheel 101. Alternatively, the end of the motor shaft 21 can extend out of the electric drive housing 1 to be connected to the first braking mechanism 4 and the second braking mechanism 5, and the end of the output half shaft 3 can extend out of the electric drive housing 1 to be connected to the wheel 101.

[0092] In this embodiment, as Figures 1 - 2 shown, the drive motor 2 is arranged inside the electric drive housing 1, and the motor shaft 21 extends out of the electric drive housing 1, so that the end of the motor shaft 21 extending out of the electric drive housing 1 can be connected to the first braking mechanism 4 and the second braking mechanism 5, ensuring the reliability of the power output of the drive motor 2. And the transmission structure 6 is installed inside the electric drive housing 1. One end of the output half shaft 3 is power-connected to the transmission structure 6, and the other end can extend out of the electric drive housing 1, so that the end of the output half shaft 3 extending out of the electric drive housing 1 can be connected to the wheel 101, so as to output the power of the transmission structure 6 to the wheel 101 outside the electric drive housing 1 through the output half shaft 3, thereby ensuring the running reliability of the wheel 101.

[0093] The present invention also proposes a control method for an electric drive assembly.

[0094] According to the control method of the electric drive assembly of the embodiment of the present invention, it is applicable to the electric drive assembly 100 of any one of the above, as Figures 1 - 2 shown, the control method includes:

[0095] S100. Detect the braking state of the wheel end;

[0096] S200. When the braking state is normal braking, obtain the braking intensity requirement;

[0097] S300. According to the braking intensity requirement, control the first braking mechanism 4 and the second braking mechanism 5 to brake the motor shaft 21 with a target braking number.

[0098] Specifically, a control system is provided inside the vehicle, and the control system is electrically connected to the drive motor 2, the first brake mechanism 4 and the second brake mechanism 5, so that the control system can control the operation and shutdown of the drive motor 2, the first brake mechanism 4 and the second brake mechanism 5, and can also detect the operating status of the drive motor 2, the first brake mechanism 4 and the second brake mechanism 5 to ensure the reliability of vehicle operation. When it is detected that the operating status of the first brake mechanism 4 and the second brake mechanism 5 is normal, that is, the first brake mechanism 4 and the second brake mechanism 5 can be opened and closed normally, the control system can obtain the braking intensity requirement of the vehicle.

[0099] Furthermore, the vehicle is provided with a braking system, which can be electrically connected to the control system. The braking system is provided with foot pedals, etc. The degree of the user's stepping on the foot pedals can be converted into electrical signals and transmitted to the control system so that the control system can obtain the vehicle's braking intensity requirement. When the stepping degree is small, the vehicle's braking intensity requirement is also small. When the stepping degree is large, the vehicle's braking intensity requirement is also large.

[0100] The control system can control the first brake mechanism 4 and the second brake mechanism 5 to brake the motor shaft 21 with a target braking number according to the braking intensity requirement. When the braking intensity requirement is small, only one brake mechanism can be set to brake the motor shaft 21, that is, only the first brake mechanism 4 is controlled to brake the motor shaft 21, or only the second brake mechanism 5 is controlled to brake the motor shaft 21. When the braking intensity requirement is large, two brake mechanisms can be set to brake the motor shaft 21, that is, the first brake mechanism 4 and the second brake mechanism 5 are controlled to brake the motor shaft 21 at the same time.

[0101] In this way, the vehicle can be braked by only one braking mechanism under normal road conditions. When the vehicle is in road conditions where greater braking intensity is required, such as continuous turning or downhill sections, it can be braked by two braking mechanisms, ensuring braking reliability, enriching the vehicle's applicable scenarios, improving vehicle driving safety, and thus improving user experience.

[0102] According to the control method of the electric drive assembly of the embodiment of the present invention, the motor shaft 21 is directly braked by the first braking mechanism 4 and the second braking mechanism 5, which can simplify the overall structure of the electric drive assembly 100, thereby reducing the manufacturing cost of the electric drive assembly 100 and reducing the space occupied by the electric drive assembly 100, so as to improve the lightweight of the vehicle, thereby improving the vehicle's endurance performance, and the first braking mechanism 4 and the second braking mechanism 5 can selectively brake the motor shaft 21 respectively, thereby achieving a variety of braking effects, improving the braking effect of the electric drive assembly 100, so that the vehicle can adapt to different usage scenarios, and can ensure the reliability of the use of the electric drive assembly 100, thereby improving the safety of use, ensuring the user experience, better use effect, and a wider range of applications.

[0103] In some embodiments, such as Figure 5 shown, according to the braking intensity requirement, controlling the first braking mechanism 4 and the second braking mechanism 5 to brake the motor shaft 21 with a target braking number includes:

[0104] S310. When the braking intensity requirement is a large braking intensity requirement, control the first braking mechanism 4 and the second braking mechanism 5 to jointly brake the motor shaft 21;

[0105] S320. And when the braking intensity requirement is not a large braking intensity requirement, control the first braking mechanism 4 to brake the motor shaft 21 alone.

[0106] Specifically, different road conditions will be encountered during vehicle operation. When the vehicle travels on a normal road section, the braking intensity requirement is small, and when the vehicle runs on a turning, downhill road section or the vehicle speed is relatively fast, the braking intensity requirement is large. Thus, the control system can control the first braking mechanism 4 and the second braking mechanism 5 to brake the motor shaft 21 with a target braking number according to the braking intensity requirement.

[0107] And when the braking intensity requirement is not a large braking intensity requirement, that is, when the braking intensity requirement is small, only one braking mechanism can be set to brake the motor shaft 21, that is, only control the first braking mechanism 4 to brake the motor shaft 21, or only control the second braking mechanism 5 to brake the motor shaft 21. In this embodiment, only one first braking mechanism 4 can be controlled to brake the motor shaft 21.

[0108] When the braking intensity requirement is a large braking intensity requirement, that is, when the braking intensity requirement is relatively large, two braking mechanisms can be set to brake the motor shaft 21, that is, control the first braking mechanism 4 and the second braking mechanism 5 to jointly brake the motor shaft 21, and then the operation number of the braking mechanism can be adjusted as needed to ensure the reliability and safety of vehicle operation.

[0109] In addition, both the first braking mechanism 4 and the second braking mechanism 5 can adopt EMB wire-controlled brake calipers, so as to achieve decoupling and joint control of double brake calipers, and improve control flexibility and reliability.

[0110] In some embodiments, controlling the first braking mechanism 4 and the second braking mechanism 5 to jointly brake the motor shaft 21 includes: controlling the first braking mechanism 4 and the second braking mechanism 5 to brake the motor shaft 21 with the same braking force.

[0111] Specifically, the first braking mechanism 4 and the second braking mechanism 5 are respectively installed at both ends of the motor shaft 21. When the first braking mechanism 4 operates, it can brake the motor shaft 21. When the second braking mechanism 5 operates, it can also brake the motor shaft 21. Moreover, when the first braking mechanism 4 and the second braking mechanism 5 operate simultaneously, they can also brake the motor shaft 21. When a greater braking intensity is required, the control system can control the first braking mechanism 4 and the second braking mechanism 5 to operate simultaneously, so that the first braking mechanism 4 and the second braking mechanism 5 respectively brake both ends of the motor shaft 21 at the same time.

[0112] And the control system can control the first braking mechanism 4 and the second braking mechanism 5 to brake the motor shaft 21 with the same braking force. That is, the braking system can transmit the required braking force to the control system, and the control system can evenly distribute this braking force to control the first braking mechanism 4 and the second braking mechanism 5 to brake the motor shaft 21 according to the evenly distributed braking force, thereby ensuring that the braking forces received at both ends of the motor shaft 21 are equal, avoiding situations such as bending caused by uneven forces at both ends of the motor shaft 21, ensuring the operating reliability of the drive motor 2, and extending the service life of the drive motor 2.

[0113] In some embodiments, as Figure 6 shown, the control method further includes:

[0114] S400. When the braking state is abnormal braking, determine whether the first braking mechanism 4 fails;

[0115] S500. When the first braking mechanism 4 fails, control the second braking mechanism 5 to brake the motor shaft 21;

[0116] S600. And when the first braking mechanism 4 does not fail, control the first braking mechanism 4 to brake the motor shaft 21.

[0117] Specifically, the control system can detect the operating states of the drive motor 2, the first braking mechanism 4, and the second braking mechanism 5 to ensure the operating reliability of the vehicle. When it detects that the operating states of the first braking mechanism 4 and the second braking mechanism 5 are abnormal, it can determine whether the main braking mechanism fails. That is, when the first braking mechanism 4 is set as the main braking mechanism, it is necessary to determine whether the first braking mechanism 4 fails.

[0118] Furthermore, when the first braking mechanism 4 fails, it can control the auxiliary braking mechanism to operate, that is, control the second braking mechanism 5 to operate, so that the second braking mechanism 5 can brake the motor shaft 21 to ensure braking reliability, thereby improving the operating safety of the vehicle. And when the first braking mechanism 4 does not fail, the first braking mechanism 4 still performs the main braking. The control system can control the first braking mechanism 4 to operate to brake the motor shaft 21.

[0119] In this way, when the braking state is abnormal, there is still a braking mechanism that can operate normally, which can ensure the reliability of the braking mechanism to brake the motor shaft 21, thereby improving the reliability of the use of the electric drive assembly 100 and further ensuring the running safety of the vehicle. When the first braking mechanism 4 is set as the main braking mechanism and the second braking mechanism 5 is set as the auxiliary braking mechanism, in actual setting, the second braking mechanism 5 can also be set as the main braking mechanism and the first braking mechanism 4 can be set as the auxiliary braking mechanism.

[0120] In some embodiments, such as Figure 7 shown, the control method further includes:

[0121] S700. Obtain the braking force distribution requirements of the front wheels and the rear wheels;

[0122] S800. According to the braking force distribution requirements, control the first braking mechanism 4 and / or the second braking mechanism 5 corresponding to the front wheels and the rear wheels to brake the corresponding motor shaft 21 with a target braking force.

[0123] Specifically, the vehicle can be provided with four electric drive assemblies 100 to provide power to the corresponding four wheels 101 respectively. Each electric drive assembly 100 can be provided with a first braking mechanism 4 and a second braking mechanism 5 to ensure the braking reliability of each wheel 101. When the vehicle is running, the loads on the front and rear parts of the vehicle are different, so that when the vehicle brakes, the control system can obtain the distribution requirements of the braking forces of the front wheels and the rear wheels through the axle load ratios of the front and rear parts of the vehicle to ensure the overall braking reliability of the vehicle.

[0124] And after the braking forces of the front wheels and the rear wheels are distributed, the braking mechanism corresponding to each wheel 101 can brake the corresponding motor shaft 21. When the braking intensity requirement is small, only the first braking mechanism 4 corresponding to each wheel 101 can be controlled to brake the corresponding motor shaft 21. When the braking intensity requirement is large, the first braking mechanism 4 and the second braking mechanism 5 corresponding to each wheel 101 can be controlled to jointly brake the corresponding motor shaft 21. At this time, the required braking force of the motor shaft 21 is evenly distributed by the first braking mechanism 4 and the second braking mechanism 5.

[0125] [[ID=2)]0]In addition, when a braking abnormality occurs in the wheel 101, if the first braking mechanism 4 corresponding to the wheel 101 is normal, the first braking mechanism 4 can be controlled to brake the corresponding motor shaft 21. If the first braking mechanism 4 is abnormal, the corresponding second braking mechanism 5 can be controlled to brake the corresponding motor shaft 21 to ensure the braking reliability.

[0126] Among them, when the number of operating braking mechanisms is one, the braking force required for the corresponding wheel 101 is realized by this one braking mechanism. When the number of operating braking mechanisms is two, the braking force required for the corresponding wheel 101 is realized by evenly distributing it through the two braking mechanisms, so as to ensure the braking reliability of each wheel 101, and further ensure the use safety of the vehicle.

[0127] In some embodiments, as Figure 8 shown, the control method further includes:

[0128] S900. Control the first braking mechanism 4 and / or the second braking mechanism 5 corresponding to the two front wheels to brake the corresponding motor shaft 21 with the same target braking force;

[0129] S1000. And control the first braking mechanism 4 and / or the second braking mechanism 5 corresponding to the two rear wheels to brake the corresponding motor shaft 21 with the same target braking force.

[0130] Specifically, when the vehicle brakes, the braking force can be distributed to the front wheels and the rear wheels as needed according to the front and rear axle load ratios. And the braking force distributed to the two front wheels of the vehicle can be evenly distributed to the left front wheel and the right front wheel, and the braking force distributed to the two rear wheels can be evenly distributed to the left rear wheel and the right rear wheel.

[0131] When the braking force distributed to the left front wheel is large, the first braking mechanism 4 and the second braking mechanism 5 corresponding to the left front wheel can be controlled to operate simultaneously to brake the motor shaft 21 corresponding to the left front wheel. At this time, the braking force distributed to the left front wheel can be evenly distributed by the first braking mechanism 4 and the second braking mechanism 5.

[0132] When the braking force distributed to the left front wheel is small, the first braking mechanism 4 corresponding to the left front wheel can be controlled to operate to brake the motor shaft 21 corresponding to the left front wheel. At this time, the braking force distributed to the left front wheel is all completed by the first braking mechanism 4.

[0133] When a braking abnormality occurs in the left front wheel, if the first braking mechanism 4 corresponding to the left front wheel is abnormal, the second braking mechanism 5 corresponding to the left front wheel brakes the motor shaft 21 corresponding to the left front wheel. At this time, the braking force distributed to the left front wheel is all completed by the second braking mechanism 5. If the first braking mechanism 4 corresponding to the left front wheel is normal, the first braking mechanism 4 corresponding to the left front wheel still brakes the motor shaft 21 corresponding to the left front wheel. At this time, the braking force distributed to the left front wheel is all completed by the first braking mechanism 4.

[0134] The right front wheel, the left rear wheel, and the right rear wheel all operate according to the control method of the left front wheel. In this way, the braking reliability of each wheel 101 can be ensured, and further the use safety of the vehicle can be improved.

[0135] such asFigure 9 Figure 10 As shown in Figure 9 Figure 10 , the complete operation process of the electric drive assembly 100 is as follows:

[0136] When the vehicle is running and braking, the control system detects the braking state of the wheel 101. When the detection result is normal, the control system can judge the braking intensity requirement of the vehicle. When the braking intensity requirement is small, only the first braking mechanism 4 can be controlled to brake the motor shaft 21 of the corresponding wheel 101. When the braking intensity requirement is large, the first braking mechanism 4 and the second braking mechanism 5 can be controlled to brake the corresponding motor shaft 21 simultaneously.

[0137] At this time, the braking force required by the wheels 101 corresponding to the first braking mechanism 4 and the second braking mechanism 5 is evenly distributed by the first braking mechanism 4 and the second braking mechanism 5, and the braking force of the whole vehicle is distributed to the front wheels and rear wheels according to the axle load ratio of the front and rear parts of the vehicle as required, and the braking forces of the left wheel and the right wheel are set to be equal.

[0138] When the longitudinal deceleration of the vehicle matches the braking force of each wheel 101, the braking of the vehicle is completed. When the longitudinal deceleration of the vehicle does not match the braking force of each wheel 101, the control system continues to control each braking mechanism to brake the motor shaft 21 of the corresponding wheel 101 until the longitudinal deceleration of the vehicle matches the braking force of each wheel 101.

[0139] And when the detection result of the control system for the braking state of the wheel 101 is abnormal, the operating state of the first braking mechanism 4 of the wheel 101 with the abnormality can be judged. When the first braking mechanism 4 is operating abnormally, the second braking mechanism 5 of the wheel 101 can be controlled to brake the motor shaft 21 of the wheel 101. When the first braking mechanism 4 is operating normally, the first braking mechanism 4 is still controlled to brake the motor shaft 21 of the wheel 101.

[0140] At this time, the braking force required by the wheel 101 is completed by the braking mechanism operating normally, and the braking force of the whole vehicle is distributed to the front wheels and rear wheels according to the axle load ratio of the front and rear parts of the vehicle as required, and the braking forces of the left wheel and the right wheel are set to be equal.

[0141] When the longitudinal deceleration of the vehicle matches the braking force of each wheel 101, the braking of the vehicle is completed. When the longitudinal deceleration of the vehicle does not match the braking force of each wheel 101, the control system continues to control each braking mechanism to brake the motor shaft 21 of the corresponding wheel 101 until the longitudinal deceleration of the vehicle matches the braking force of each wheel 101.

[0142] The present invention also proposes a vehicle.

[0143] The vehicle according to the embodiment of the present invention includes the electric drive assembly 100 of any one of the above.

[0144] A vehicle according to an embodiment of the present invention is provided with an electric drive assembly 100, and the electric drive assembly 100 directly brakes the motor shaft 21 through a first braking mechanism 4 and a second braking mechanism 5, which can simplify the overall structure of the electric drive assembly 100, thereby reducing the manufacturing cost of the electric drive assembly 100, reducing the space occupied by the electric drive assembly 100, improving the vehicle lightweight, further improving the endurance performance of the vehicle, and the first braking mechanism 4 and the second braking mechanism 5 can selectively brake the motor shaft 21 respectively, thereby achieving various braking effects, improving the braking effect of the electric drive assembly 100, enabling the vehicle to adapt to different usage scenarios, ensuring the reliability of the use of the electric drive assembly 100, improving the use safety, ensuring the user experience, having better use effects and a wider application range.

[0145] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0146] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric drive assembly (100), characterized in that, Comprising: A drive motor (2), the drive motor (2) being provided with a motor shaft (21), the motor shaft (21) being used to drive the output half shaft (3) to rotate; A first braking mechanism (4) and a second braking mechanism (5), the first braking mechanism (4) and the second braking mechanism (5) being used to selectively brake the motor shaft (21) respectively.

2. The electric drive assembly (100) according to claim 1, characterized in that, Both ends of the motor shaft (21) extend to two opposite sides of the drive motor (2), and the first braking mechanism (4) and the second braking mechanism (5) are respectively installed at both ends of the motor shaft (21).

3. The electric drive assembly (100) according to claim 2, characterized in that, The first braking mechanism (4) includes a first brake caliper (41) and a first brake disc (42), the first brake disc (42) is connected to one end of the motor shaft (21), and the first brake caliper (41) is adapted to clamp the first brake disc (42) when the vehicle brakes; And / or, the second braking mechanism (5) includes a second brake caliper (51) and a second brake disc (52), the second brake disc (52) is connected to the other end of the motor shaft (21), and the second brake caliper (51) is adapted to clamp the second brake disc (52) when the vehicle brakes.

4. The electric drive assembly (100) according to claim 1, characterized in that, It further includes a transmission structure (6), and the motor shaft (21) is power-connected to the output half shaft (3) through the transmission structure (6).

5. The electric drive assembly (100) according to claim 4, characterized in that, The transmission structure (6) includes a driving gear (61), an intermediate gear (62) and an output gear (63), the driving gear (61) is arranged outside the motor shaft (21), the output gear (63) is arranged outside the output half shaft (3), and the intermediate gear (62) meshes with the driving gear (61) and the output gear (63) respectively.

6. The electric drive assembly (100) according to claim 5, characterized in that, The tooth number ratio between the driving gear (61) and the intermediate gear (62) is set to be different from the tooth number ratio between the intermediate gear (62) and the output gear (63).

7. The electric drive assembly (100) according to claim 5, characterized in that, In the projection along the up-down direction, the axis of the motor shaft (21), the axis of the intermediate gear (62) and the axis of the output half shaft (3) are arranged in parallel at intervals in the front-back direction.

8. The electric drive assembly (100) according to claim 4, characterized in that, It further includes an electric drive housing (1), and the drive motor (2) and the transmission structure (6) are both arranged inside the electric drive housing (1); Wherein, the end of the motor shaft (21) extends outside the electric drive housing (1) to be connected to the first braking mechanism (4) and the second braking mechanism (5), and / or the end of the output half shaft (3) extends outside the electric drive housing (1) to be connected to a wheel (101).

9. A control method for an electric drive assembly, characterized in that, Applicable to the electric drive assembly (100) according to any one of claims 1-8, the control method includes: Detecting the braking state of the wheel end; When the braking state is normal braking, obtaining the braking intensity requirement; According to the braking intensity requirement, controlling the first braking mechanism (4) and the second braking mechanism (5) to brake the motor shaft (21) with a target braking number.

10. The control method of the electric drive assembly according to claim 9, wherein, Controlling the first braking mechanism (4) and the second braking mechanism (5) to brake the motor shaft (21) with a target braking quantity according to the braking intensity requirement includes: When the braking intensity requirement is a large braking intensity requirement, controlling the first braking mechanism (4) and the second braking mechanism (5) to jointly brake the motor shaft (21); And when the braking intensity requirement is not a large braking intensity requirement, controlling the first braking mechanism (4) to brake the motor shaft (21).

11. The control method of the electric drive assembly according to claim 10, characterized in that, Controlling the first braking mechanism (4) and the second braking mechanism (5) to jointly brake the motor shaft (21) includes: Controlling the first braking mechanism (4) and the second braking mechanism (5) to brake the motor shaft (21) with the same braking force.

12. The control method of the electric drive assembly according to claim 9, characterized in that, The control method further includes: When the braking state is abnormal braking, determining whether the first braking mechanism (4) fails; When the first braking mechanism (4) fails, controlling the second braking mechanism (5) to brake the motor shaft (21); And when the first braking mechanism (4) does not fail, controlling the first braking mechanism (4) to brake the motor shaft (21).

13. The control method of the electric drive assembly according to claim 9, wherein The control method further includes: Obtaining the braking force distribution requirements of the front wheels and the rear wheels; According to the braking force distribution requirements, controlling the first braking mechanism (4) and / or the second braking mechanism (5) corresponding to the front wheels and the rear wheels to brake the corresponding motor shaft (21) with a target braking force.

14. The control method of the electric drive assembly according to claim 9, wherein The control method further includes: Controlling the first braking mechanism (4) and / or the second braking mechanism (5) corresponding to the two front wheels to brake the corresponding motor shaft (21) with the same target braking force; And controlling the first braking mechanism (4) and / or the second braking mechanism (5) corresponding to the two rear wheels to brake the corresponding motor shaft (21) with the same target braking force.

15. A vehicle, characterized in that, Including the electric drive assembly (100) according to any one of claims 1-8.

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