Hybrid drive axle system and control method thereof

Abstract

The invention relates to a hybrid drive axle system and a control method thereof. A hybrid drive axle system comprises a first input shaft, one end of the first input shaft is connected with the output end of an engine, a planet carrier is fixed to the other end of the first input shaft, a motor shaft is installed on the first input shaft, the motor shaft rotates under the action of a power motor, and a sun gear is installed on the motor shaft; the sun gear is meshed with a planet gear on a planet carrier, the planet gear is further meshed with a gear ring fixed to one end of a second input shaft, the second input shaft is connected with the input end of a differential mechanism, and the output end of the differential mechanism is connected with a load; and the clutch assembly comprises an input shaft clutch, a motor clutch and a gear ring clutch. By arranging the clutch assembly, decoupling between engine output and power motor output can be achieved, efficiency adjustment of the input end of the drive axle system is achieved, and the system is high in efficiency, compact in structure and high in adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a hybrid drive axle system and a control method thereof. Background Art

[0002] With the development of automobile engineering technology, hybrid vehicle technology has emerged. By combining two or more drive systems that can operate simultaneously to form a vehicle drive system, it realizes the characteristic of providing power flexibly according to the actual operating state of the vehicle. Hybrid vehicles, commonly referred to as hybrid vehicles, generally refer to oil-electric hybrid vehicles, which use traditional internal combustion engines and electric motors as power sources, and transmit the power output to the vehicle's drive wheels through the drive axle. As an important component of the vehicle, the drive axle is located at the end of the vehicle's transmission system. It is used to adjust and transmit the torque and speed from the powertrain or gearbox. It is also used to withstand the vertical force, longitudinal force and lateral force acting between the road surface and the frame or body, as well as the braking torque and reaction force. The structure of the drive axle usually includes a main reducer, a differential, wheels, and a drive axle housing.

[0003] In traditional technology, the drive axle used in hybrid vehicles is mainly divided into mechanical drive axle and electric drive axle according to the configuration and drive form of the hybrid system. The mechanical drive axle is responsible for receiving the power of the gearbox or power system and transmitting it to the drive wheels; while the electric drive axle integrates the power motor, reduction or speed change device, differential, wheels and drive axle housing, and can output the power of the power motor to the drive wheels.

[0004] However, in the above-mentioned traditional technologies, the mechanical drive axle adopts a transmission shaft with a cross-section at the front end. When there is an angle between the cross-sections, its non-uniform speed transmission characteristics will cause the speed of the drive axle end to change periodically, which not only affects the driving comfort and driving smoothness, but also may shorten the life of the drive axle; at the same time, the transmission shaft also has efficiency loss during the transmission process. Although the electric drive axle is commonly used in series hybrid vehicles and can realize the conversion of mechanical energy to electrical energy and then to mechanical energy, the efficiency of this conversion process is low, which affects the fuel economy of the whole vehicle. Summary of the invention

[0005] Based on this, it is necessary to provide a hybrid drive axle system and a control method thereof to address the problems of low transmission efficiency, low energy conversion efficiency, and inability to decouple the powertrain in traditional drive axles.

[0006] A hybrid drive axle system, the drive axle system comprising: a first input shaft, one end of the first input shaft is connected to an output end of an engine, the other end of the first input shaft is fixed to a planet carrier, a motor shaft is coaxially mounted on an outer circumferential surface of the first input shaft, the motor shaft rotates under the action of a power motor, a concentrically arranged sun gear is matched and mounted on the outer circumferential surface of the motor shaft, the sun gear is meshed and mounted with a planet gear on the planet carrier, the planet gear is also meshed and mounted with a gear ring fixed to one end of a second input shaft, the second input shaft is connected to an input end of a differential through a reducer gear set, and an output end of the differential is connected to a load;

[0007] It also includes a clutch assembly, which includes an input shaft clutch installed between the first input shaft and the bridge housing, a motor clutch installed between the power motor and the bridge housing, and a ring gear clutch installed between the ring gear and the planetary carrier. By controlling the working state of the clutch assembly, the torque input to the second input shaft through the ring gear is adjusted, and then the torque output to the load through the differential is adjusted.

[0008] In one embodiment, the input shaft clutch includes: a first driving plate fixed on the inner wall surface of the bridge housing, and a first driven plate fixed on the outer circumferential surface of the first input shaft. When the first driving plate is engaged with the first driven plate, the input shaft clutch is in a locked state. When the first driving plate is separated from the first driven plate, the input shaft clutch is in a released state.

[0009] In one embodiment, the power motor includes: a motor stator fixed to the inner wall of the bridge housing, and a motor rotor arranged concentrically and spaced apart from the motor stator. When the power motor is powered on, the motor rotor rotates relative to the motor stator.

[0010] In one embodiment, the motor clutch includes: a second active disk fixed on the inner wall of the bridge housing, and a second driven disk fixed on the side wall of the motor rotor. When the second active disk is engaged with the second driven disk, the motor clutch is in a locked state. When the second active disk is separated from the second driven disk, the motor clutch is in a released state.

[0011] In one embodiment, the ring gear clutch includes: a third active plate fixed on the side wall of the planetary carrier, and a third driven plate fixed on the side wall of the ring gear. When the third active plate is engaged with the third driven plate, the ring gear clutch is in a locked state. When the third active plate is separated from the third driven plate, the ring gear clutch is in a released state.

[0012] In one embodiment, the differential includes: a housing, a gear shaft is mounted inside the housing, a first planetary gear and a second planetary gear are mounted on the outer circumferential surface of the gear shaft with a relative spacing, and a first half-shaft gear and a second half-shaft gear are meshed and mounted between the first planetary gear and the second planetary gear.

[0013] In one embodiment, the first half-shaft gear is fixed on the outer circumferential surface of the first output half-shaft, and the second half-shaft gear is fixed on the outer circumferential surface of the second output half-shaft.

[0014] A control method adopts the above-mentioned drive axle system, and the control method comprises:

[0015] By respectively controlling the working states of the input shaft clutch, the motor clutch, and the ring gear clutch, and at the same time controlling the output state of the power motor, the engine, and the output state of the power transmission system matched with the engine, the drive axle system is placed in a driving mode or an energy recovery mode.

[0016] In one embodiment, the driving mode includes a direct drive reduction mode, a drive double reduction mode, an electric drive mode, and a power split mode;

[0017] When the drive axle system is in direct drive deceleration mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is locked. At the same time, the power motor is in a free rotation state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, the planetary carrier and the ring gear are in a state of rotating at the same speed under the locking action of the ring gear clutch, so that the rotation speed of the first input shaft and the second input shaft is the same;

[0018] The torque inputted by the engine to the first input shaft is synchronously transmitted to the second input shaft through the planetary carrier and the ring gear, and then drives the load forward through the reducer gear set and the differential;

[0019] When the drive axle system is in the driving double reduction mode, the input shaft clutch is released, the motor clutch is locked, and the ring gear clutch is released. At the same time, the power motor is in a zero speed state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier;

[0020] The torque inputted by the engine to the first input shaft is transmitted to the second input shaft through the single-stage reduction device, and then drives the load forward through the reduction gear set and the differential;

[0021] When the drive axle system is in electric drive mode, the input shaft clutch is locked, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in a driving torque control state, and the engine and the power transmission system matched with the engine are in a no-power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier;

[0022] The torque inputted into the motor shaft by the power motor is transmitted to the second input shaft through the single-stage reduction device, and then drives the load forward through the reduction gear set and the differential;

[0023] When the drive axle system is in power split mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in a torque adjustment state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier;

[0024] The torque input from the engine to the first input shaft and the torque input from the power motor to the motor shaft are coupled through a single-stage reduction device and transmitted to the second input shaft, and then driven forward by the reducer gear set and the differential.

[0025] In one embodiment, the energy recovery mode includes an engine braking deceleration mode, an engine braking double deceleration mode, a single braking energy recovery mode, and a braking power split mode;

[0026] When the drive axle system is in the engine braking deceleration mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is locked. At the same time, the power motor is in a free rotation state, and the engine and the power transmission system matched with the engine are in a braking state. At this time, the planetary carrier and the ring gear are in a state of rotating at the same speed under the locking action of the ring gear clutch, so that the rotation speed of the first input shaft and the second input shaft is the same;

[0027] The braking power inputted by the engine to the first input shaft is synchronously transmitted to the second input shaft through the planet carrier and the ring gear, and then brakes and decelerates the load through the reducer gear set and the differential;

[0028] When the drive axle system is in the engine brake dual reduction mode, the input shaft clutch is released, the motor clutch is locked, and the ring gear clutch is released. At the same time, the power motor is in a zero speed state, and the engine and the power transmission system matched with the engine are in a braking state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier;

[0029] The braking power inputted by the engine to the first input shaft is transmitted to the second input shaft through the single-stage reduction device, and then brakes and decelerates the load through the reducer gear set and differential;

[0030] When the drive axle system is in single brake energy recovery mode, the input shaft clutch is locked, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in a brake power control state, and the engine and the power transmission system matched with the engine are in a no-power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier;

[0031] The braking feedback power inputted from the power motor to the motor shaft is transmitted to the second input shaft through the single-stage reduction device, and then brakes and decelerates the load through the reducer gear set and differential;

[0032] When the drive axle system is in the braking power split mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in the torque adjustment state, and the engine and the power transmission system matched with the engine are in the braking state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier;

[0033] The braking power input from the engine to the first input shaft and the braking feedback power input from the power motor to the motor shaft are coupled through a single-stage reduction device and transmitted to the second input shaft, and then braked and decelerated the load through the reducer gear set and the differential.

[0034] The above-mentioned hybrid drive axle system and control method thereof, by setting a clutch assembly, can achieve decoupling between the engine output and the power motor output, effectively adjust the working point of the power motor, the engine and the working point and working gear of the power transmission system matched with the engine, and realize efficiency adjustment of the input end of the drive axle system; at the same time, the drive axle system can realize braking energy recovery in the whole vehicle speed range, effectively reduce the energy loss of the whole vehicle, can realize stepless speed change, and effectively improve the driving smoothness and driving comfort of the whole vehicle; the system has high efficiency, compact structure and strong adaptability, and is particularly suitable for vehicles such as trucks and rear-wheel drive passenger cars. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a drive axle system provided in one embodiment of the present application;

[0036] Figure 2 Amplification of the drive axle system provided in one embodiment of the present application Figure 1 .

[0037] Figure 3 Amplification of the drive axle system provided in one embodiment of the present application Figure 2 .

[0038] Figure 4 A flow chart of a control method provided in one embodiment of the present application.

[0039] Notes on the attached drawings:

[0040] 1. Input shaft clutch; 2. Motor clutch; 3. Ring gear clutch; 4. Wheel hub; 5. First input shaft; 6. Second input shaft; 7. Bridge housing; 8. Motor shaft; 9. Power motor; 10. Sun gear; 11. Planet carrier; 12. Planet gear; 13. Ring gear; 14. Input flange; 15. Differential; 16. Speed ​​reducer driving gear; 17. Speed ​​reducer driven gear; 18. First output half shaft; 19. Second output half shaft;

[0041] 101. a first active disk; 102. a first driven disk;

[0042] 201, second active disk; 202, second driven disk;

[0043] 301, a third active disk; 302, a third driven disk;

[0044] 901, motor stator; 902, motor rotor;

[0045] 1501, housing; 1502, gear shaft; 1503, first planetary gear; 1504, second planetary gear; 1505, first half-shaft gear; 1506, second half-shaft gear. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0052] See also Figure 1FIG. 1 shows a schematic diagram of the structure of a hybrid drive axle system in an embodiment of the present invention. The hybrid drive axle system comprises: a first input shaft 5, one end of the first input shaft 5 is connected to the output end of the engine, the other end of the first input shaft 5 is fixed to a planetary carrier 11, a motor shaft 8 is coaxially mounted on the outer circumference of the first input shaft 5, the motor shaft 8 rotates under the action of a power motor 9, a concentrically arranged sun gear 10 is mounted on the outer circumference of the motor shaft 8, the sun gear 10 is meshed with a planetary gear 12 on the planetary carrier 11, and the planetary gear 12 is also fixed to the second input shaft 6. The ring gear 13 at one end is meshed and installed, the second input shaft 6 is connected to the input end of the differential 15 through the reducer gear set, and the output end of the differential 15 is connected to the load; it also includes a clutch assembly, the clutch assembly includes an input shaft clutch 1 installed between the first input shaft 5 and the bridge housing 7, a motor clutch 2 installed between the power motor 9 and the bridge housing 7, and a ring gear clutch 3 installed between the ring gear 13 and the planetary carrier 11. By controlling the working state of the clutch assembly, the torque input to the second input shaft 6 through the ring gear 13 is adjusted, and then the torque output to the load through the differential 15 is adjusted.

[0053] In the above-mentioned drive axle system, by setting the input shaft clutch 1 and the motor clutch 2, the switching between the engine power output and the power output of the power motor 9 can be realized. By setting the ring gear clutch 3, the decoupling between the engine power output and the power output of the power motor 9 can be realized, thereby effectively improving the efficiency of the input end of the drive axle system, reducing the energy loss of the whole vehicle, realizing stepless speed change, and effectively improving the driving smoothness and driving comfort of the whole vehicle. It is particularly suitable for vehicles such as trucks and rear-wheel drive passenger cars.

[0054] Combination Figure 2 As shown, Figure 2 The enlarged view of the drive axle system provided by an embodiment of the present application is shown. Figure 1 In some embodiments, the first input shaft 5 is the input shaft of the entire drive axle system. The end of the first input shaft 5 extends to the outside of the bridge housing 7 and is fixed with an input flange 14, which is connected to the output shaft of the vehicle power transmission system through the input flange 14. In addition, the input end of the vehicle power transmission system is connected to the output end of the engine. By setting the input flange 14, stable transmission between the engine and the first input shaft 5 can be achieved, thereby improving the working stability of the system.

[0055] The motor shaft 8 coaxially arranged with the first input shaft 5 is a hollow shaft. The motor shaft 8 and the first input shaft 5 are rotationally matched via a bearing assembly. The first input shaft 5 and the motor shaft 8 form a power shaft group, which can selectively switch the engine or the power motor 9 as the power source of the vehicle according to the driving requirements of the vehicle.

[0056] In some embodiments, the bridge housing 7 includes a front bridge housing and a rear bridge housing, which are fixed to each other. The bridge housing 7 surrounds other components of the drive axle system, supports these components and ensures their normal operation, while protecting them from damage from the external environment; in addition, when the vehicle is driving, the bridge housing 7 bears the various reaction forces, bending moments and braking moments transmitted from the driving wheels, and transmits them to the frame through the suspension, ensuring that the power and braking force of the vehicle can be effectively transmitted.

[0057] The input shaft clutch 1 includes: a first active disk 101 fixed on the inner wall surface of the bridge housing 7, and a first driven disk 102 fixed on the outer circumferential surface of the first input shaft 5. When the first active disk 101 is engaged with the first driven disk 102, the input shaft clutch 1 is in a locked state. At this time, the first input shaft 5 is locked and cannot rotate, maintaining zero speed; when the first active disk 101 is separated from the first driven disk 102, the input shaft clutch 1 is in a released state. At this time, the first input shaft 5 is released and can rotate freely.

[0058] In addition, the input shaft clutch 1 also includes a flywheel disposed on the first active disc 101, which is used to store the kinetic energy output by the engine and balance the unstable torque generated when the engine is running;

[0059] The pressure plate disposed on the flywheel can move along the axial direction of the flywheel, and generates pressure between the flywheel and the pressure plate through a compression mechanism (such as a compression spring) to ensure that the driven plate and the flywheel can be in close contact, so that the first active plate 101 and the first driven plate 102 are engaged to form a friction surface to transmit or cut off power;

[0060] And the operating mechanism, the vehicle's electronic control system or torque converter and other devices to control the separation and engagement of the clutch.

[0061] When the first active disk 101 needs to be separated from the first driven disk 102, the pressure plate is triggered by the operating mechanism to overcome the pressure of the compression spring and move backward, thereby driving the first active disk 101 away from the first driven disk 102, so that the two are separated;

[0062] When the first active disk 101 needs to engage with the first driven disk 102 , the operating mechanism triggers the pressure plate to move forward under the action of the compression spring, thereby driving the first active disk 101 to approach the first driven disk 102 so that the two are engaged.

[0063] The power motor 9 includes: a motor stator 901 fixed to the inner wall of the bridge housing 7, and a motor rotor 902 arranged concentrically and spaced apart from the motor stator 901. When the power motor 9 is powered on, the motor rotor 902 rotates relative to the motor stator 901. The input end of the power motor 9 is connected to the vehicle battery, and the vehicle battery is used to power the power motor 9, thereby driving the motor rotor 902 to rotate relative to the motor stator 901, and then driving the motor shaft 8 to rotate through the motor rotor 902.

[0064] The motor clutch 2 includes: a second active disc 201 fixed on the inner wall of the bridge housing 7, and a second driven disc 202 fixed on the side wall of the motor rotor 902. When the second active disc 201 is engaged with the second driven disc 202, the motor clutch 2 is in a locked state, at which time the motor rotor 902 cannot rotate and maintains zero speed; when the second active disc 201 is separated from the second driven disc 202, the motor clutch 2 is in a released state. At this time, the motor rotor 902 can rotate automatically.

[0065] The ring gear clutch 3 includes: a third active disk 301 fixed on the side wall of the planet carrier 11, and a third driven disk 302 fixed on the side wall of the ring gear 13. When the third active disk 301 is engaged with the third driven disk 302, the ring gear clutch 3 is in a locked state. At this time, the ring gear 13 and the planet carrier 11 are relatively fixed, so that the rotation speeds of the ring gear 13 and the planet carrier 11 are consistent; when the third active disk 301 is separated from the third driven disk 302, the ring gear clutch 3 is in a released state. At this time, the rotation speeds of the ring gear 13 and the planet carrier 11 are decoupled, and a single-stage reduction device is formed between the sun gear 10, the ring gear 13 and the planet gear 12 on the planet carrier 11.

[0066] The engagement and disengagement process of the motor clutch 2 and the engagement and disengagement process of the ring gear clutch 3 are similar to the engagement and disengagement process of the input shaft clutch 1 and will not be described in detail here.

[0067] Combination Figure 3 As shown, Figure 3 The enlarged view of the drive axle system provided by an embodiment of the present application is shown. Figure 1 In some embodiments, the differential 15 includes: a housing 1501, a gear shaft 1502 is installed inside the housing 1501, a first planetary gear 1503 and a second planetary gear 1504 are installed on the outer circumferential surface of the gear shaft 1502 with a spacing therebetween, and a first half-shaft gear 1505 and a second half-shaft gear 1506 are installed in meshing relationship with each other between the first planetary gear 1503 and the second planetary gear 1504.

[0068] The second input shaft 6 provides torque input for the differential 15. The second input shaft 6 and the differential 15 transmit power through a reducer gear set. The reducer gear set includes: a reducer driving gear 16 fixed to the end of the second input shaft 6, and a reducer driven gear 17 connected to the housing 1501;

[0069] The rotating second input shaft 6 drives the reducer driven gear 17 to rotate through the reducer driving gear 16, and the reducer driven gear 17 drives the housing 1501 to rotate, thereby driving the first planetary gear 1503 and the second planetary gear 1504 that are rotationally matched with the gear shaft 1502 to rotate respectively.

[0070] The first side gear 1505 is fixed on the outer circumference of the first output side shaft 18, and the second side gear 1506 is fixed on the outer circumference of the second output side shaft 19. In some embodiments, the load of the drive axle system is the wheel hub 4 of the vehicle, and the ends of the first output side shaft 18 and the second output side shaft 19 are both equipped with the wheel hub 4, and the first side gear 1503 and the second planetary gear 1504 rotate to drive the first side gear 1505 and the second side gear 1506 to rotate, thereby driving the corresponding wheel hub 4 to rotate through the first output side shaft 18 and the second output side shaft 19, respectively, so that the vehicle can move forward, backward, slide or brake to slow down.

[0071] See also Figure 4 , Figure 4 A control method in an embodiment of the present application is shown, using the above-mentioned drive axle system, and the control method includes:

[0072] Get the vehicle working mode;

[0073] Select the working mode of the drive axle system according to the vehicle working mode; the specific selection process is:

[0074] First, determine whether the working mode of the drive axle system is a driving mode, if yes, perform the subsequent working steps of the driving mode, if no, determine whether the working mode of the drive axle system is an energy recovery mode, if yes, perform the subsequent working steps of the energy recovery mode, if no, re-acquire the vehicle working mode;

[0075] By respectively controlling the working states of the input shaft clutch 1, the motor clutch 2, and the ring gear clutch 3, and at the same time controlling the output state of the power motor 9, the engine, and the output state of the power transmission system matched with the engine, the drive axle system is placed in a driving mode or an energy recovery mode.

[0076] The driving modes include direct drive reduction mode, drive double reduction mode, electric drive mode, and power split mode;

[0077] When the drive axle system is in direct drive deceleration mode, the input shaft clutch 1 is released, the motor clutch 2 is released, and the ring gear clutch 3 is locked. At the same time, the power motor 9 is in a free rotation state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, the planetary carrier 11 and the ring gear 13 are in a state of rotating at the same speed under the locking action of the ring gear clutch 3, so that the first input shaft 5 and the second input shaft 6 have the same rotation speed;

[0078] The torque inputted by the engine to the first input shaft 5 is synchronously transmitted to the second input shaft 6 through the planetary carrier 11 and the ring gear 13, and then drives the load forward through the reducer gear set and the differential 15;

[0079] When the drive axle system is in the driving double reduction mode, the input shaft clutch 1 is released, the motor clutch 2 is locked, and the ring gear clutch 3 is released. At the same time, the power motor 9 is in a zero speed state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, a single-stage reduction device is formed between the sun gear 10, the ring gear 13 and the planetary gear 12 on the planetary carrier 11;

[0080] The torque inputted by the engine to the first input shaft 5 is transmitted to the second input shaft 6 through the single-stage reduction device, and then drives the load forward through the reducer gear set and the differential 15; the single-stage reduction device and the reducer gear set form a double reduction, which can improve the working stability of the electric drive axle system;

[0081] When the drive axle system is in the electric drive mode, the input shaft clutch 1 is locked, the motor clutch 2 is released, and the ring gear clutch 3 is released. At the same time, the power motor 9 is in the driving torque control state, and the engine and the power transmission system matched with the engine are in a non-power output state (including the engine being in the flameout state, or the power transmission system matched with the engine being in the neutral state). At this time, a single-stage reduction device is formed between the sun gear 10, the ring gear 13 and the planetary gear 12 on the planetary carrier 11;

[0082] The torque inputted by the power motor 9 to the motor shaft 8 is transmitted to the second input shaft 6 through the single-stage reduction device, and then drives the load forward through the reducer gear set and the differential 15;

[0083] When the drive axle system is in the power split mode, the input shaft clutch 1 is released, the motor clutch 2 is released, and the ring gear clutch 3 is released. At the same time, the power motor 9 is in the torque adjustment state, and the engine and the power transmission system matched with the engine are in the power output state. At this time, a single-stage reduction device is formed between the sun gear 10, the ring gear 13 and the planetary gear 12 on the planetary carrier 11;

[0084] The torque input from the engine to the first input shaft 5 and the torque input from the power motor 9 to the motor shaft 8 are coupled through a single-stage reduction device and transmitted to the second input shaft 6, and then drive the load forward through the reducer gear set and the differential 15.

[0085] Energy recovery modes include engine braking deceleration mode, engine braking double deceleration mode, single braking energy recovery mode, and braking power split mode;

[0086] When the drive axle system is in the engine braking deceleration mode, the input shaft clutch 1 is released, the motor clutch 2 is released, and the ring gear clutch 3 is locked. At the same time, the power motor 9 is in a free rotation state, and the engine and the power transmission system matched with the engine are in a braking state. At this time, the planetary carrier 11 and the ring gear 13 are in a state of rotating at the same speed under the locking action of the ring gear clutch 3, so that the first input shaft 5 and the second input shaft 6 have the same rotation speed;

[0087] The braking power inputted by the engine to the first input shaft 5 is synchronously transmitted to the second input shaft 6 through the planet carrier 11 and the ring gear 13, and then brakes and decelerates the load through the reducer gear set and the differential 15;

[0088] When the drive axle system is in the engine brake double reduction mode, the input shaft clutch 1 is released, the motor clutch 2 is locked, and the ring gear clutch 3 is released. At the same time, the power motor 9 is in a zero speed state, and the engine and the power transmission system matched with the engine are in a braking state. At this time, a single-stage reduction device is formed between the sun gear 10, the ring gear 13 and the planetary gear 12 on the planetary carrier 11;

[0089] The braking power inputted by the engine to the first input shaft 5 is transmitted to the second input shaft 6 through the single-stage reduction device, and then brakes and decelerates the load through the reducer gear set and the differential 15;

[0090] When the drive axle system is in the single brake energy recovery mode, the input shaft clutch 1 is locked, the motor clutch 2 is released, and the ring gear clutch 3 is released. At the same time, the power motor 9 is in the braking power control state, and the engine and the power transmission system matched with the engine are in the no-power output state. At this time, a single-stage reduction device is formed between the sun gear 10, the ring gear 13 and the planetary gear 12 on the planetary carrier 11;

[0091] The braking feedback power inputted by the power motor 9 to the motor shaft 8 is transmitted to the second input shaft 6 through the single-stage reduction device, and then brakes and decelerates the load through the reducer gear set and the differential 15;

[0092] When the drive axle system is in the braking power split mode, the input shaft clutch 1 is released, the motor clutch 2 is released, and the ring gear clutch 3 is released. At the same time, the power motor 9 is in the torque adjustment state, and the engine and the power transmission system matched with the engine are in the braking state. At this time, a single-stage reduction device is formed between the sun gear 10, the ring gear 13 and the planetary gear 12 on the planetary carrier 11;

[0093] The braking power input from the engine to the first input shaft 5 and the braking feedback power input from the power motor 9 to the motor shaft 8 are coupled through a single-stage reduction device and transmitted to the second input shaft 6, and then braked and decelerated by the load through the reducer gear set and the differential 15.

[0094] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A hybrid drive axle system, characterized in that: The drive axle system comprises: a first input shaft, one end of the first input shaft is connected to the output end of the engine, the other end of the first input shaft is fixed to the planet carrier, a motor shaft is coaxially mounted on the outer circumferential surface of the first input shaft, the motor shaft rotates under the action of the power motor, a concentrically arranged sun gear is matched and mounted on the outer circumferential surface of the motor shaft, the sun gear is meshed with the planet gear on the planet carrier, the planet gear is also meshed with the ring gear fixed to one end of the second input shaft, the second input shaft is connected to the input end of the differential through the reducer gear set, and the output end of the differential is connected to the load; It also includes a clutch assembly, which includes an input shaft clutch installed between the first input shaft and the bridge housing, a motor clutch installed between the power motor and the bridge housing, and a ring gear clutch installed between the ring gear and the planetary carrier. By controlling the working state of the clutch assembly, the torque input to the second input shaft through the ring gear is adjusted, and then the torque output to the load through the differential is adjusted.

2. The hybrid drive axle system according to claim 1, characterized in that: The input shaft clutch includes: a first driving plate fixed on the inner wall surface of the bridge housing, and a first driven plate fixed on the outer circumferential surface of the first input shaft. When the first driving plate is engaged with the first driven plate, the input shaft clutch is in a locked state. When the first driving plate is separated from the first driven plate, the input shaft clutch is in a released state.

3. The hybrid drive axle system according to claim 1, characterized in that: The power motor comprises: a motor stator fixed to the inner wall of the bridge housing, and a motor rotor arranged concentrically and spaced apart from the motor stator. When the power motor is powered on, the motor rotor rotates relative to the motor stator.

4. The hybrid drive axle system according to claim 3, characterized in that: The motor clutch includes: a second active disk fixed on the inner wall surface of the bridge housing, and a second driven disk fixed on the side wall surface of the motor rotor. When the second active disk is engaged with the second driven disk, the motor clutch is in a locked state. When the second active disk is separated from the second driven disk, the motor clutch is in a released state.

5. The hybrid drive axle system according to claim 1, characterized in that: The ring gear clutch includes: a third active plate fixed on the side wall surface of the planet carrier, and a third driven plate fixed on the side wall surface of the ring gear. When the third active plate is engaged with the third driven plate, the ring gear clutch is in a locked state. When the third active plate is separated from the third driven plate, the ring gear clutch is in a released state.

6. The hybrid drive axle system according to claim 1, characterized in that: The differential includes: a housing, a gear shaft is installed inside the housing, a first planetary gear and a second planetary gear are installed on the outer circumferential surface of the gear shaft with a spacing therebetween, and a first half-shaft gear and a second half-shaft gear are installed in mesh with each other and arranged opposite to each other.

7. The hybrid drive axle system according to claim 6, characterized in that: The first half-shaft gear is fixed on the outer circumferential surface of the first output half-shaft, and the second half-shaft gear is fixed on the outer circumferential surface of the second output half-shaft.

8. A control method, characterized in that: Using the drive axle system according to any one of claims 1 to 7, the control method comprises: By respectively controlling the working states of the input shaft clutch, the motor clutch, and the ring gear clutch, and at the same time controlling the output state of the power motor, the engine, and the output state of the power transmission system matched with the engine, the drive axle system is placed in a driving mode or an energy recovery mode.

9. The control method according to claim 8, characterized in that: The driving modes include direct drive reduction mode, drive double reduction mode, electric drive mode, and power split mode; When the drive axle system is in direct drive deceleration mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is locked. At the same time, the power motor is in a free rotation state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, the planetary carrier and the ring gear are in a state of rotating at the same speed under the locking action of the ring gear clutch, so that the rotation speed of the first input shaft and the second input shaft is the same; The torque inputted by the engine to the first input shaft is synchronously transmitted to the second input shaft through the planetary carrier and the ring gear, and then drives the load forward through the reducer gear set and the differential; When the drive axle system is in the driving double reduction mode, the input shaft clutch is released, the motor clutch is locked, and the ring gear clutch is released. At the same time, the power motor is in a zero speed state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier; The torque inputted by the engine to the first input shaft is transmitted to the second input shaft through the single-stage reduction device, and then drives the load forward through the reduction gear set and the differential; When the drive axle system is in electric drive mode, the input shaft clutch is locked, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in a driving torque control state, and the engine and the power transmission system matched with the engine are in a no-power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier; The torque inputted into the motor shaft by the power motor is transmitted to the second input shaft through the single-stage reduction device, and then drives the load forward through the reduction gear set and the differential; When the drive axle system is in power split mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in a torque adjustment state, and the engine and the power transmission system matched with the engine are in a power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier; The torque input from the engine to the first input shaft and the torque input from the power motor to the motor shaft are coupled through a single-stage reduction device and transmitted to the second input shaft, and then driven forward by the reducer gear set and the differential.

10. The control method according to claim 8, characterized in that: The energy recovery mode includes an engine braking deceleration mode, an engine braking double deceleration mode, a single braking energy recovery mode, and a braking power split mode; When the drive axle system is in the engine braking deceleration mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is locked. At the same time, the power motor is in a free rotation state, and the engine and the power transmission system matched with the engine are in a braking state. At this time, the planetary carrier and the ring gear are in a state of rotating at the same speed under the locking action of the ring gear clutch, so that the rotation speed of the first input shaft and the second input shaft is the same; The braking power inputted by the engine to the first input shaft is synchronously transmitted to the second input shaft through the planet carrier and the ring gear, and then brakes and decelerates the load through the reducer gear set and the differential; When the drive axle system is in the engine brake dual reduction mode, the input shaft clutch is released, the motor clutch is locked, and the ring gear clutch is released. At the same time, the power motor is in a zero speed state, and the engine and the power transmission system matched with the engine are in a braking state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier; The braking power inputted by the engine to the first input shaft is transmitted to the second input shaft through the single-stage reduction device, and then brakes and decelerates the load through the reducer gear set and differential; When the drive axle system is in single brake energy recovery mode, the input shaft clutch is locked, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in a brake power control state, and the engine and the power transmission system matched with the engine are in a no-power output state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier; The braking feedback power inputted from the power motor to the motor shaft is transmitted to the second input shaft through the single-stage reduction device, and then brakes and decelerates the load through the reducer gear set and differential; When the drive axle system is in the braking power split mode, the input shaft clutch is released, the motor clutch is released, and the ring gear clutch is released. At the same time, the power motor is in the torque adjustment state, and the engine and the power transmission system matched with the engine are in the braking state. At this time, a single-stage reduction device is formed between the sun gear, the ring gear and the planetary gear on the planetary carrier; The braking power input from the engine to the first input shaft and the braking feedback power input from the power motor to the motor shaft are coupled through a single-stage reduction device and transmitted to the second input shaft, and then braked and decelerated the load through the reducer gear set and the differential.

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