A hybrid drive device for a hybrid vehicle and a control method thereof

Abstract

The present invention discloses a hybrid drive device for a hybrid vehicle and its control method, which includes an engine, an auxiliary motor assembly, a main drive motor assembly, an output shaft, and a differential assembly. The auxiliary motor assembly is connected to the engine, and the engine and the main drive motor assembly are connected to the differential assembly through the output shaft. Beneficial effects: The present invention realizes the switching between multiple output working modes through the cooperation among the engine, the auxiliary motor assembly, and the main drive motor assembly. At the same time, according to the working state information of each assembly of the hybrid drive device, the driver intention information, and the vehicle operating condition information, the output working mode has two-gear changes through the shift execution device, which increases the adaptability of the entire power drive device to different working conditions, reduces the fuel consumption of the whole vehicle, improves the driving smoothness and driving comfort, and avoids the hidden danger of power interruption during the gear shift process of the power drive device.

Description

Technical Field

[0001] The present invention relates to a power driving device and a control method thereof, and particularly provides a hybrid driving device for a hybrid vehicle and a control method thereof, belonging to the technical field of hybrid vehicle transmissions. Background Art

[0002] A hybrid vehicle refers to a vehicle with two or more power sources, generally specifically referring to a vehicle currently widely used that is hybrid-driven by an engine and an electric motor. Due to its excellent energy-saving and emission-reduction effects, it has become a research hotspot in the current automotive field.

[0003] As a key technology in hybrid vehicles, the hybrid powertrain system plays a decisive role in improving the overall performance of the vehicle. Existing hybrid powertrain systems usually adopt a parallel-axis architecture. The parallel-axis architecture is mostly applied to two types: a configuration improved based on a traditional transmission and a new hybrid configuration adopting a synchronizer structure.

[0004] In the prior art, the configuration improved based on a traditional transmission has a single working mode and a complex structure, with disadvantages of high manufacturing cost and poor fuel economy. The new hybrid configuration adopting a synchronizer structure usually adopts a "single clutch + multiple gears" configuration and a "multiple clutches + multiple gears" configuration. The "single clutch + multiple gears" configuration adopts a synchronizer structure, which will generate a large impact during the gear shifting process, increasing the gear shifting time and affecting the smoothness of gear shifting. In addition, there is a power interruption during the working process, seriously affecting the driving comfort. Multiple gears will also lead to an increase in the number of synchronizers and a higher manufacturing cost. The "multiple clutches + multiple gears" configuration not only has the defects of the "single clutch + multiple gears" configuration, but also with the increase in the number of clutches, the control difficulty for multiple gears is improved and the manufacturing cost is also increased. Summary of the Invention

[0005] Object of the Invention: Aiming at the deficiencies in the prior art, the present invention provides a hybrid driving device for a hybrid vehicle and a control method thereof. The present invention realizes the switching between multiple output working modes through the cooperation among the engine, the auxiliary motor assembly, and the main drive motor assembly, reduces the fuel consumption of the whole vehicle, avoids the hidden danger of power interruption during the gear shifting process of the power driving device, and improves the driving smoothness and driving comfort.

[0006] Technical solution: A hybrid drive device for a hybrid vehicle, comprising an engine, an auxiliary motor assembly, a main drive motor assembly, an output shaft, and a differential assembly. The auxiliary motor assembly is connected to the engine, and the engine and the main drive motor assembly are connected to the differential assembly through the output shaft. It is characterized in that: The auxiliary motor assembly includes an auxiliary motor, an auxiliary motor gear, a brake A, and an auxiliary motor linkage device. The auxiliary motor linkage device is sleeved on the engine output shaft of the engine, the brake A can lock the auxiliary motor linkage device, the auxiliary motor linkage device is connected to the output shaft of the auxiliary motor through the auxiliary motor gear, and a shift execution device is provided between the engine output shaft and the output shaft.

[0007] The present invention realizes the switching between multiple output working modes through the cooperation among the engine, the auxiliary motor assembly, and the main drive motor assembly. At the same time, the shift execution device can also make the output working mode have two gear changes, increasing the adaptability of the entire power drive device to different working conditions, reducing the fuel consumption of the whole vehicle, avoiding the hidden danger of power interruption during the gear change process of the power drive device, and improving the driving smoothness and driving comfort.

[0008] Preferred option, the main drive motor assembly includes a main drive motor, a connecting gear, and a brake B. The output shaft of the main drive motor is connected to the output shaft through the connecting gear, and the brake B can lock the output shaft of the main drive motor.

[0009] Preferred option, the shift execution device includes a first gear control device and a second gear control device; the first gear control device includes a first clutch and a first gear. The engine output shaft is connected to the first gear through the first clutch, and the first gear is connected to the output shaft; the second gear control device includes a second clutch and a second gear. The engine output shaft is connected to the second gear, and the second gear is connected to the output shaft through the second clutch.

[0010] Preferred option, the differential assembly includes a differential and a main reduction gear. The differential is connected to the output shaft through the main reduction gear.

[0011] A control method for a hybrid drive device for a hybrid vehicle, characterized by comprising the following steps:

[0012] Step 1, information collection,

[0013] The data interaction management layer collects the working state information of each assembly of the current hybrid drive device, the driver intention information, and the vehicle operation condition information. The driver intention information includes the driver-requested driving torque T reqe and the driver-requested braking torque T br, the vehicle operating condition information includes the state of charge (SOC) of the power supply and the vehicle speed V currrnt ;

[0014] Step 2, information data analysis

[0015] The data interaction and parsing layer identifies the working state information of each assembly of the hybrid drive device, the driver intention information, and the vehicle operating condition information, and determines the vehicle state information. The data interaction and parsing layer sends the parsed vehicle state information to the vehicle control strategy layer;

[0016] Step 3, execute the power output working mode

[0017] The vehicle control strategy layer analyzes and calculates based on the vehicle state information, determines the power output working mode of the hybrid drive device, and issues a working mode execution command to the actuator control layer. The actuator control layer controls each assembly of the hybrid drive device to complete the corresponding action command according to the working mode execution command, and feeds back the information on whether the action command is completed to the actuator control layer. Furthermore, the hybrid drive device realizes the power output of the corresponding working mode. The action commands include engine control commands, auxiliary motor assembly control commands, main drive motor assembly control commands, power supply control commands, first clutch control commands, and second clutch control commands;

[0018] Step 4, verification of action command execution

[0019] The actuator control layer determines whether each assembly of the hybrid drive device continues to execute the action command according to the information on whether the action command is completed. If it is determined that the action command is not completed, the corresponding assembly of the hybrid drive device continues to execute the corresponding action command until the action command is completed.

[0020] Preferred option, the power output working modes of the hybrid drive device in Step 3 include: pure electric working mode, range extender working mode, engine direct drive working mode, hybrid drive working mode, and energy braking recovery working mode; the hybrid drive mode includes combined drive working mode and on - vehicle power generation working mode.

[0021] Preferred option, the control method of the power output working mode of the hybrid drive device is as follows:

[0022] Pure electric working mode

[0023] The brake B, the first clutch, and the second clutch are disengaged, the brake A is engaged, the engine and the auxiliary motor assembly are in an inoperative state, the power supply supplies power to the main drive motor assembly, and the power output by the main drive motor assembly is transmitted to the differential output through the output shaft of the main drive motor, the connecting gear, the output shaft, and the main reduction gear;

[0024] Range-extended operation mode

[0025] Brakes A and B, the first clutch, and the second clutch are disengaged. The power supply powers the auxiliary motor assembly and the main drive motor assembly. The auxiliary motor assembly drives the engine into the operating mode. The power output by the engine passes through the auxiliary motor linkage and the auxiliary motor gear to drive the auxiliary motor assembly to generate electricity. The electric power generated by the auxiliary motor assembly charges the power supply or directly drives the main drive motor assembly. The power output by the main drive motor assembly is transmitted to the differential output through the output shaft of the main drive motor, the connecting gear, the output shaft, and the main reducer gear;

[0026] Engine direct drive operation mode, which is divided into engine direct drive first gear operation mode and engine direct drive second gear operation mode;

[0027] Engine direct drive first gear operation mode

[0028] Brakes A and the second clutch are disengaged. Brakes B and the first clutch are engaged. The main drive motor assembly is in a non-operating state. The power supply powers the auxiliary motor assembly. The auxiliary motor assembly drives the engine into the operating mode. The power output by the engine passes through the engine output shaft, the first clutch, the first gear, the output shaft, and the main reducer gear to be transmitted to the differential output;

[0029] Engine direct drive second gear operation mode

[0030] Brakes A and the first clutch are disengaged. Brakes B and the second clutch are engaged. The main drive motor assembly is in a non-operating state. The power supply powers the auxiliary motor assembly. The auxiliary motor assembly drives the engine into the operating mode. The power output by the engine passes through the engine output shaft, the second clutch, the second gear, the output shaft, and the main reducer gear to be transmitted to the differential output;

[0031] Hybrid drive operation mode, which is divided into combined drive operation mode and on-road power generation operation mode;

[0032] Combined drive operation mode, which is divided into combined drive first gear operation mode and combined drive second gear operation mode;

[0033] Combined drive first gear operation mode

[0034] Brake A, Brake B, and the second clutch are disengaged, and the first clutch is engaged. The power supply powers the auxiliary motor assembly and the main drive motor assembly. The auxiliary motor assembly drives the engine into the working mode. The power output by the engine passes through the engine output shaft, the first clutch, and the first gear to be transmitted to the output shaft. The power output by the main drive motor assembly passes through the output shaft of the main drive motor and the connecting gear to be transmitted to the output shaft. The two powers converge at the output shaft and then pass through the main reducer gear to be transmitted to the differential for output.

[0035] Combined drive second gear working mode

[0036] Brake A, Brake B, and the first clutch are disengaged, and the second clutch is engaged. The power supply powers the auxiliary motor assembly and the main drive motor assembly. The auxiliary motor assembly drives the engine into the working mode. The power output by the engine passes through the engine output shaft, the second clutch, and the second gear to be transmitted to the output shaft. The power output by the main drive motor assembly passes through the output shaft of the main drive motor and the connecting gear to be transmitted to the output shaft. The two powers converge at the output shaft and then pass through the main reducer gear to be transmitted to the differential for output.

[0037] Vehicle power generation working mode, and the vehicle power generation working mode is divided into vehicle power generation first gear working mode and vehicle power generation second gear working mode;

[0038] Vehicle power generation first gear working mode

[0039] Brake A, Brake B, and the second clutch are disengaged, and the first clutch is engaged. The power supply powers the auxiliary motor assembly. The auxiliary motor assembly drives the engine into the working mode. The power output by the engine passes through the engine output shaft, the first clutch, and the first gear to be branched at the output shaft: one way of power passes through the main reducer gear to be transmitted to the differential for output; the other way of power passes through the connecting gear and the output shaft of the main drive motor to drive the main drive motor assembly to generate electricity, and the electric power generated by the main drive motor assembly charges the power supply.

[0040] Vehicle power generation second gear working mode

[0041] Brake A, Brake B, and the first clutch are disengaged, and the second clutch is engaged. The power supply powers the auxiliary motor assembly. The auxiliary motor assembly drives the engine into the working mode. The power output by the engine passes through the engine output shaft, the second clutch, and the second gear to be branched at the output shaft: one way of power passes through the main reducer gear to be transmitted to the differential for output; the other way of power passes through the connecting gear and the output shaft of the main drive motor to drive the main drive motor assembly to generate electricity, and the electric power generated by the main drive motor assembly charges the power supply.

[0042] Energy braking recovery working mode

[0043] The brake B, the first clutch, and the second clutch are disengaged, and the brake A is engaged. The engine and the auxiliary motor assembly are in an inoperative state. During braking, the braking process power recovered by the differential is driven through the main reducer gear, the output shaft, the connecting gear, and the output shaft of the main drive motor to drive the main drive motor assembly to generate electricity, and the electric power generated by the main drive motor assembly charges the power source.

[0044] Preferred option, the determination steps for determining the power output working mode of the hybrid drive device in step three are as follows:

[0045] S1: During the vehicle startup phase,

[0046] Based on the vehicle state information transmitted by the data interaction parsing layer, determine the state of charge SOC of the power source.

[0047] If the state of charge SOC of the power source > the state of charge SOC at which the range extender working mode starts switch , the power output working mode of the hybrid drive device is the pure electric working mode;

[0048] If the state of charge SOC of the power source < the state of charge SOC at which the range extender working mode starts switch and it satisfies that the state of charge SOC of the power source < the state of charge SOC at which the power source starts L , the power output working mode of the hybrid drive device is the engine direct drive working mode, and according to the working requirements, determine whether to use the engine direct drive first gear working mode or the engine direct drive second gear working mode;

[0049] S2: During the vehicle driving phase,

[0050] During the vehicle driving phase, determine the driver-requested driving torque T reqe and the driver-requested braking torque T br ,

[0051] If the driver-requested driving torque T reqe < 0 and the driver-requested braking torque T br > 0, the power output working mode of the hybrid drive device is the range extender working mode;

[0052] If the driver-requested driving torque T reqe > 0, determine the vehicle driving speed V currrnt , the driver-requested driving torque T reqe should be prioritized over the vehicle driving speed V currrnt for determination,

[0053] When the vehicle driving speed V currrnt < the engine driving vehicle speed V switchWhen the power output working mode of the hybrid drive device is the range - extender working mode;

[0054] When the vehicle driving speed V currrnt > the engine - driven vehicle speed V switch Continue to determine the driver - requested driving torque T reqe ,

[0055] If T reqe > the maximum torque threshold T for the engine to operate efficiently max , the power output working mode of the hybrid drive device is the combined - drive working mode. According to the working requirements, determine whether to use the combined - drive first - gear working mode or the combined - drive second - gear working mode;

[0056] If the minimum torque threshold T for the engine to operate efficiently min < T reqe < the maximum torque threshold T for the engine to operate efficiently max , the power output working mode of the hybrid drive device is the engine direct - drive working mode. According to the working requirements, determine whether to use the engine direct - drive first - gear working mode or the engine direct - drive second - gear working mode;

[0057] If T reqe < the minimum torque threshold T for the engine to operate efficiently min , the power output working mode of the hybrid drive device is the on - vehicle power generation mode. According to the working requirements, determine whether to use the on - vehicle power generation first - gear working mode or the on - vehicle power generation second - gear working mode;

[0058] S3: During the vehicle braking stage,

[0059] According to the vehicle state information transmitted by the data interaction and analysis layer, determine the driver - requested braking torque T br ,

[0060] If the driver - requested braking torque T br > 0, the power output working mode of the hybrid drive device is the energy braking recovery working mode.

[0061] Preferred option, the control method for switching between the first - gear mode and the second - gear mode of the power output working mode of the hybrid drive device in steps S1 and S2 is as follows:

[0062] Step A, information data analysis,

[0063] The data analysis system analyzes the driver - requested driving torque signal and the vehicle driving speed signal according to the vehicle state information transmitted by the data interaction management layer and transmits them to the working gear determination strategy layer, and the working gear determination strategy layer analyzes and obtains the target gear signal;

[0064] Step B, target demand calculation,

[0065] The shift work control strategy layer analyzes and obtains the engine target demand, the main drive motor target demand, and the clutch target demand based on the target gear signal and the working state information of each assembly of the hybrid drive device, and transmits the target demand information to the actuator control layer;

[0066] Step C, execute the action command,

[0067] The actuator control layer issues corresponding action execution commands to the engine, the main drive motor, the first clutch, and the second clutch according to the target demand information.

[0068] The new gear clutch starts to move to the engagement point, the original gear clutch starts to disengage, and the main drive motor provides power for the vehicle movement. If the original gear clutch is not completely disengaged, it continues to disengage until the original gear clutch is completely disengaged.

[0069] After the original gear clutch is completely disengaged, the new gear clutch starts to enter the slip friction stage.

[0070] Adjust the engine output speed. When the speed difference between the engine output speed and the driven component speed of the new gear clutch is within the set threshold, adjust the engine output torque. The new gear clutch completes the engagement, and the compensation torque provided by the main drive motor for the vehicle gradually decreases to zero, and the new gear starts to work.

[0071] Preferred option, the working process of the engine when switching between the first gear mode and the second gear mode of the power output working mode of the hybrid drive device in step C is as follows:

[0072] Step C1, determine the engine target throttle opening through the engine look-up table model according to the engine target demand and the current engine speed;

[0073] Step C2, the engine controller adjusts the current throttle opening of the engine, thereby adjusting the engine output torque;

[0074] Step C3, determine the magnitude of the clutch output torque and the driver's requested driving torque. If the clutch output torque is less than the driver's requested driving torque, the main drive motor provides power to compensate for the remaining torque required for vehicle driving until the clutch output torque reaches the driver's requested driving torque, and the main drive motor stops providing power compensation, and the new gear starts to work.

[0075] Beneficial effects: The present invention realizes the switching between multiple output working modes through the cooperation among the engine, the auxiliary motor assembly, and the main drive motor assembly. At the same time, according to the working state information of each assembly of the hybrid drive device, the driver intention information, and the vehicle operation condition information, the shift execution device enables the output working mode to have two gear changes, increasing the adaptability of the entire power drive device to different working conditions, reducing the vehicle fuel consumption, and enhancing the driving smoothness and driving comfort. During the gear shift process, the engine controller adjusts the engine throttle opening, thereby adjusting the engine output torque, determining the size of the clutch output torque and the driver-requested driving torque, and adjusting the main drive motor to provide power compensation, avoiding the hidden danger of power interruption during the gear change of the power drive device, and further improving the shift quality and the driver's driving experience. Description of the Drawings

[0076] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0077] Figure 1 It is the structural schematic diagram of the hybrid drive device of the present invention.

[0078] Figure 2 It is the schematic diagram of the control method of the hybrid drive device of the present invention.

[0079] Figure 3 It is the power transmission route diagram of the pure electric working mode of the present invention.

[0080] Figure 4 It is the power transmission route diagram of the range extender working mode of the present invention.

[0081] Figure 5 It is the power transmission route diagram of the engine direct drive first gear working mode of the present invention.

[0082] Figure 6 It is the power transmission route diagram of the engine direct drive second gear working mode of the present invention.

[0083] Figure 7 It is the power transmission route diagram of the combined drive first gear working mode of the present invention.

[0084] Figure 8 It is the power transmission route diagram of the combined drive second gear working mode of the present invention.

[0085] Figure 9 It is the power transmission route diagram of the on-road power generation first gear working mode of the present invention.

[0086] Figure 10 This is the power transmission route diagram of the second gear working mode of the vehicle power generation of the present invention.

[0087] Figure 11 This is the power transmission route diagram of the energy braking recovery working mode of the present invention.

[0088] Figure 12 This is the determination logic diagram of the power output working mode of the hybrid drive device of the present invention.

[0089] Figure 13 This is the schematic diagram of the control method for switching between the first gear mode and the second gear mode of the power output working mode of the hybrid drive device of the present invention.

[0090] Figure 14 This is the schematic diagram of the engine working principle when switching between the first gear mode and the second gear mode of the power output working mode of the hybrid drive device of the present invention.

[0091] Figure 15 This is the control strategy flowchart when switching between the first gear mode and the second gear mode of the power output working mode of the hybrid drive device of the present invention. Detailed implementation manners

[0092] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0093] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 to the present invention.

[0094] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include contact between the first and second features through additional features therebetween rather than direct contact. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0095] As Figure 1 shown, a hybrid drive device for a hybrid vehicle includes an engine 1, an auxiliary motor assembly 2, a main drive motor assembly 3, an output shaft 4, and a differential assembly 5. The auxiliary motor assembly 2 is connected to the engine 1, and the engine 1 and the main drive motor assembly 3 are connected to the differential assembly 5 through the output shaft 4. It is characterized in that: the auxiliary motor assembly 2 includes an auxiliary motor 21, an auxiliary motor gear 22, a brake A 23, and an auxiliary motor linkage device 24. The auxiliary motor linkage device 24 is sleeved on the engine output shaft 11 of the engine 1. The brake A 23 can lock the auxiliary motor linkage device 24. The auxiliary motor linkage device 24 is connected to the output shaft of the auxiliary motor 21 through the auxiliary motor gear 22. A shift execution device 6 is provided between the engine output shaft 11 and the output shaft 4.

[0096] The present invention realizes the switching between multiple output working modes through the cooperation among the engine 1, the auxiliary motor assembly 2, and the main drive motor assembly 3. At the same time, the shift execution device 6 can also enable the output working mode to have two gear changes, increasing the adaptability of the entire power drive device to different working conditions, reducing the fuel consumption of the whole vehicle, avoiding the hidden danger of power interruption during gear shifting of the power drive device, and improving the driving smoothness and driving comfort.

[0097] The main drive motor assembly 3 includes a main drive motor 31, a connecting gear 32, and a brake B 33. The output shaft of the main drive motor 31 is connected to the output shaft 4 through the connecting gear 32. The brake B 33 can lock the output shaft of the main drive motor 31.

[0098] The described shift execution device 6 includes a first gear control device 61 and a second gear control device 62; the first gear control device 61 includes a first clutch 611 and a first gear 612, the engine output shaft 11 is connected to the first gear 612 through the first clutch 611, and the first gear 612 is connected to the output shaft 4; the second gear control device 62 includes a second clutch 621 and a second gear 622, the engine output shaft 11 is connected to the second gear 622, and the second gear 622 is connected to the output shaft 4 through the second clutch 621.

[0099] The described differential assembly 5 includes a differential 51 and a main reduction gear 52, and the differential 51 is connected to the output shaft 4 through the main reduction gear 52.

[0100] As Figure 2 shown, a control method for a hybrid drive device of a hybrid vehicle is characterized by including the following steps:

[0101] Step 1, information collection.

[0102] The data interaction management layer collects the working state information of each assembly of the current hybrid drive device, the driver intention information, and the vehicle operation condition information. The driver intention information includes the driver-requested driving torque T reqe and the driver-requested braking torque T br , and the vehicle operation condition information includes the state of charge SOC of the power supply and the vehicle driving speed V currrnt .

[0103] Step 2, information data analysis.

[0104] The data interaction parsing layer identifies the working state information of each assembly of the hybrid drive device, the driver intention information, and the vehicle operation condition information and determines the vehicle state information, and the data interaction parsing layer sends the parsed vehicle state information to the vehicle control strategy layer.

[0105] Step 3, execute the power output working mode.

[0106] The vehicle control strategy layer analyzes and calculates based on the vehicle state information, determines the power output working mode of the hybrid drive device, and issues a working mode execution command to the actuator control layer. The actuator control layer controls each assembly of the hybrid drive device to complete the corresponding action command according to the working mode execution command, and feeds back the information on whether the action command is completed to the actuator control layer. Furthermore, the hybrid drive device realizes the power output of the corresponding working mode. The action commands include the engine 1 control command, the auxiliary motor assembly 2 control command, the main drive motor assembly 3 control command, the power supply control command, the first clutch 611 control command, and the second clutch 621 control command.

[0107] The power output working modes of the hybrid drive device in step three include: pure electric working mode, range extender working mode, engine direct drive working mode, hybrid drive working mode, and energy braking recovery working mode; the hybrid drive mode includes combined drive working mode and on-road power generation working mode.

[0108] The control method for the power output working mode of the hybrid drive device is as follows:

[0109] As Figure 3 shown, in the pure electric working mode,

[0110] The brake B33, the first clutch 611, and the second clutch 621 are disengaged, the brake A23 is engaged, the engine 1 and the auxiliary motor assembly 2 are in the non-working state, the power supply supplies power to the main drive motor assembly 3, and the power output by the main drive motor assembly 3 is transmitted to the differential 51 output through the output shaft of the main drive motor 31, the connecting gear 32, the output shaft 4, and the main reduction gear 52.

[0111] As Figure 4 shown, in the range extender working mode,

[0112] The brake A23, the brake B33, the first clutch 611, and the second clutch 621 are disengaged, the power supply supplies power to the auxiliary motor assembly 2 and the main drive motor assembly 3. The auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 drives the auxiliary motor assembly 2 to generate electricity through the auxiliary motor linkage device 24 and the auxiliary motor gear 22. The electric power generated by the auxiliary motor assembly 2 charges the power supply or directly drives the main drive motor assembly 3. The power output by the main drive motor assembly 3 is transmitted to the differential 51 output through the output shaft of the main drive motor 31, the connecting gear 32, the output shaft 4, and the main reduction gear 52.

[0113] For the engine direct drive working mode, the engine direct drive working mode is divided into the engine direct drive first gear working mode and the engine direct drive second gear working mode.

[0114] As Figure 5 shown, in the engine direct drive first gear working mode,

[0115] brake A23 and the second clutch 621 are disengaged, brake B33 and the first clutch 611 are engaged, the main drive motor assembly 3 is in an inoperative state, the power supply powers the auxiliary motor assembly 2, the auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 passes through the engine output shaft 11, the first clutch 611, the first gear 612, the output shaft 4, and the main reducer gear 52 and is transmitted to the differential 51 for output.

[0116] As Figure 6 shown, in the engine direct drive second gear working mode,

[0117] brake A23 and the first clutch 611 are disengaged, brake B33 and the second clutch 621 are engaged, the main drive motor assembly 3 is in an inoperative state, the power supply powers the auxiliary motor assembly 2, the auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 passes through the engine output shaft 11, the second clutch 621, the second gear 622, the output shaft 4, and the main reducer gear 52 and is transmitted to the differential 51 for output.

[0118] In the hybrid drive working mode, the hybrid drive working mode is divided into a combined drive working mode and a driving power generation working mode.

[0119] In the combined drive working mode, the combined drive working mode is divided into a combined drive first gear working mode and a combined drive second gear working mode.

[0120] As Figure 7 shown, in the combined drive first gear working mode,

[0121] brake A23, brake B33 and the second clutch 621 are disengaged, the first clutch 611 is engaged, the power supply powers the auxiliary motor assembly 2 and the main drive motor assembly 3, the auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 passes through the engine output shaft 11, the first clutch 611, and the first gear 612 and is transmitted to the output shaft 4; the power output by the main drive motor assembly 3 passes through the output shaft of the main drive motor 31 and the connecting gear 32 and is transmitted to the output shaft 4; the two powers converge at the output shaft 11 and then pass through the main reducer gear 52 and are transmitted to the differential 51 for output.

[0122] As Figure 8 shown, in the combined drive second gear working mode,

[0123] The brake A23, brake B33 and the first clutch 611 are disengaged, and the second clutch 621 is engaged. The power supply powers the auxiliary motor assembly 2 and the main drive motor assembly 3. The auxiliary motor assembly 2 drives the engine 1 into the working mode. The power output by the engine 1 passes through the engine output shaft 11, the second clutch 621, and the second gear 622 and is transmitted to the output shaft 4. The power output by the main drive motor assembly 3 passes through the output shaft of the main drive motor 31 and the connecting gear 32 and is transmitted to the output shaft 4. The two powers converge at the output shaft 11 and then pass through the main reducer gear 52 and are transmitted to the differential 51 for output.

[0124] The driving power generation working mode, and the driving power generation working mode is divided into the first-gear driving power generation working mode and the second-gear driving power generation working mode.

[0125] As Figure 9 shown, the first-gear driving power generation working mode

[0126] The brake A23, brake B33 and the second clutch 621 are disengaged, and the first clutch 611 is engaged. The power supply powers the auxiliary motor assembly 2. The auxiliary motor assembly 2 drives the engine 1 into the working mode. The power output by the engine 1 passes through the engine output shaft 11, the first clutch 611, and the first gear 612 and is transmitted to the output shaft 4 for splitting: one way of power passes through the main reducer gear 52 and is transmitted to the differential 51 for output; the other way of power passes through the connecting gear 32 and the output shaft of the main drive motor 31 to drive the main drive motor assembly 3 to generate electricity, and the electric power generated by the main drive motor assembly 3 charges the power supply.

[0127] As Figure 10 shown, the second-gear driving power generation working mode

[0128] The brake A23, brake B33 and the first clutch 611 are disengaged, and the second clutch 621 is engaged. The power supply powers the auxiliary motor assembly 2. The auxiliary motor assembly 2 drives the engine 1 into the working mode. The power output by the engine 1 passes through the engine output shaft 11, the second clutch 621, and the second gear 622 and is transmitted to the output shaft 4 for splitting: one way of power passes through the main reducer gear 52 and is transmitted to the differential 51 for output; the other way of power passes through the connecting gear 32 and the output shaft of the main drive motor 31 to drive the main drive motor assembly 3 to generate electricity, and the electric power generated by the main drive motor assembly 3 charges the power supply.

[0129] As Figure 11 shown, the energy braking recovery working mode

[0130] The brake B33, the first clutch 611, and the second clutch 621 are disengaged, the brake A23 is engaged, the engine 1 and the auxiliary motor assembly 2 are in an inoperative state. During the braking process, the braking process power recovered by the differential 51 is driven through the main reducer gear 52, the output shaft 4, the connecting gear 32, and the output shaft of the main drive motor 31 to drive the main drive motor assembly 3 to generate electricity. The electric power generated by the main drive motor assembly 3 charges the power source.

[0131] As Figure 12 shown, the determination steps for determining the power output working mode of the hybrid drive device in step three are as follows:

[0132] S1: During the vehicle startup phase,

[0133] Based on the vehicle state information transmitted by the data interaction parsing layer, determine the state of charge (SOC) of the power source.

[0134] If the state of charge (SOC) of the power source > the state of charge (SOC) of the extended-range operation mode startup threshold, switch the power output working mode of the hybrid drive device is the pure electric working mode. The brake B33, the first clutch 611, and the second clutch 621 are disengaged, the brake A23 is engaged, the engine 1 and the auxiliary motor assembly 2 are in an inoperative state. The power source supplies power to the main drive motor assembly 3. The power output by the main drive motor assembly 3 is transmitted to the differential 51 through the output shaft of the main drive motor 31, the connecting gear 32, the output shaft 4, and the main reducer gear 52.

[0135] If the state of charge (SOC) of the power source < the state of charge (SOC) of the extended-range operation mode startup threshold switch and it satisfies that the state of charge (SOC) of the power source < the state of charge (SOC) of the power source startup threshold, L the power output working mode of the hybrid drive device is the engine direct drive working mode. According to the working requirements, determine whether to use the engine direct drive first gear working mode or the engine direct drive second gear working mode.

[0136] When it is the engine direct drive first gear working mode, the brake A23 and the second clutch 621 are disengaged, the brake B33 and the first clutch 611 are engaged, the main drive motor assembly 3 is in an inoperative state. The power source supplies power to the auxiliary motor assembly 2. The auxiliary motor assembly 2 drives the engine 1 to enter the working mode. The power output by the engine 1 is transmitted to the differential 51 through the engine output shaft 11, the first clutch 611, the first gear 612, the output shaft 4, and the main reducer gear 52.

[0137] When in the engine direct drive second gear working mode, brake A23 and the first clutch 611 are disengaged, brake B33 and the second clutch 621 are engaged, the main drive motor assembly 3 is in a non-operating state, the power supply powers the auxiliary motor assembly 2, the auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 passes through the engine output shaft 11, the second clutch 621, the second gear 622, the output shaft 4, and the main reducer gear 52 to be transmitted to the differential 51 for output.

[0138] S2: During the vehicle driving stage,

[0139] During the vehicle driving stage, determine the driver's requested driving torque T reqe and the driver's requested braking torque T br ,

[0140] If the driver's requested driving torque T reqe < 0 and the driver's requested braking torque T br > 0, the power output working mode of the hybrid drive device is the range extender working mode. Brake A23, brake B33, the first clutch 611, and the second clutch 621 are disengaged. The power supply powers the auxiliary motor assembly 2 and the main drive motor assembly 3. The auxiliary motor assembly 2 drives the engine 1 to enter the working mode. The power output by the engine 1 passes through the auxiliary motor linkage 24 and the auxiliary motor gear 22 to drive the auxiliary motor assembly 2 to generate electricity. The electric power generated by the auxiliary motor assembly 2 charges the power supply or directly drives the main drive motor assembly 3. The power output by the main drive motor assembly 3 is transmitted to the differential 51 for output through the output shaft of the main drive motor 31, the connecting gear 32, the output shaft 4, and the main reducer gear 52;

[0141] If the driver's requested driving torque T reqe > 0, determine the vehicle driving speed V currrnt , the driver's requested driving torque T reqe takes precedence over the vehicle driving speed V currrnt for determination.

[0142] When the vehicle driving speed V currrnt < the engine driving speed V switchWhen the power output working mode of the hybrid drive device is the range extender working mode, brake A23, brake B33, the first clutch 611 and the second clutch 621 are disengaged. The power supply powers the auxiliary motor assembly 2 and the main drive motor assembly 3. The auxiliary motor assembly 2 drives the engine 1 to enter the working mode. The power output by the engine 1 passes through the auxiliary motor linkage 24 and the auxiliary motor gear 22 to drive the auxiliary motor assembly 2 to generate electricity. The electric power generated by the auxiliary motor assembly 2 charges the power supply or directly drives the main drive motor assembly 3. The power output by the main drive motor assembly 3 is transmitted to the differential 51 through the output shaft of the main drive motor 31, the connecting gear 32, the output shaft 4, and the main reducer gear 52 for output;

[0143] When the vehicle driving speed V currrnt > the engine driving speed V switch , continue to determine the driver's requested driving torque T reqe ,

[0144] If T reqe > the maximum torque threshold T for efficient engine operation max , the power output working mode of the hybrid drive device is the combined drive working mode. According to the working requirements, determine whether to use the combined drive first gear working mode or the combined drive second gear working mode;

[0145] When it is the combined drive first gear working mode, brake A23, brake B33 and the second clutch 621 are disengaged, and the first clutch 611 is engaged. The power supply powers the auxiliary motor assembly 2 and the main drive motor assembly 3. The auxiliary motor assembly 2 drives the engine 1 to enter the working mode. The power output by the engine 1 passes through the engine output shaft 11, the first clutch 611, and the first gear 612 to be transmitted to the output shaft 4; the power output by the main drive motor assembly 3 is transmitted to the output shaft 4 through the output shaft of the main drive motor 31 and the connecting gear 32; the two powers converge at the output shaft 11 and then are transmitted to the differential 51 through the main reducer gear 52 for output;

[0146] When it is the combined drive second gear working mode, brake A23, brake B33 and the first clutch 611 are disengaged, and the second clutch 621 is engaged. The power supply powers the auxiliary motor assembly 2 and the main drive motor assembly 3. The auxiliary motor assembly 2 drives the engine 1 to enter the working mode. The power output by the engine 1 passes through the engine output shaft 11, the second clutch 621, and the second gear 622 to be transmitted to the output shaft 4; the power output by the main drive motor assembly 3 is transmitted to the output shaft 4 through the output shaft of the main drive motor 31 and the connecting gear 32; the two powers converge at the output shaft 11 and then are transmitted to the differential 51 through the main reducer gear 52 for output;

[0147] If the minimum torque threshold T for efficient engine operationmin <T reqe <Maximum torque threshold T for efficient engine operation max , the power output working mode of the hybrid drive device is the engine direct drive working mode. According to the working requirements, it is determined whether to use the engine direct drive first gear working mode or the engine direct drive second gear working mode;

[0148] When it is the engine direct drive first gear working mode, the brake A23 and the second clutch 621 are disengaged, the brake B33 and the first clutch 611 are engaged, the main drive motor assembly 3 is in the non-working state, the power supply supplies power to the auxiliary motor assembly 2, the auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 passes through the engine output shaft 11, the first clutch 611, the first gear 612, the output shaft 4, and the main reducer gear 52 and is transmitted to the differential 51 for output.

[0149] When it is the engine direct drive second gear working mode, the brake A23 and the first clutch 611 are disengaged, the brake B33 and the second clutch 621 are engaged, the main drive motor assembly 3 is in the non-working state, the power supply supplies power to the auxiliary motor assembly 2, the auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 passes through the engine output shaft 11, the second clutch 621, the second gear 622, the output shaft 4, and the main reducer gear 52 and is transmitted to the differential 51 for output.

[0150] If T reqe <Minimum torque threshold T for efficient engine operation min , the power output working mode of the hybrid drive device is the vehicle power generation mode. According to the working requirements, it is determined whether to use the vehicle power generation first gear working mode or the vehicle power generation second gear working mode;

[0151] When it is the vehicle power generation first gear working mode, the brake A23, the brake B33, and the second clutch 621 are disengaged, the first clutch 611 is engaged, the power supply supplies power to the auxiliary motor assembly 2, the auxiliary motor assembly 2 drives the engine 1 to enter the working mode, and the power output by the engine 1 passes through the engine output shaft 11, the first clutch 611, and the first gear 612 and is split at the output shaft 4: one way of power passes through the main reducer gear 52 and is transmitted to the differential 51 for output; the other way of power passes through the connecting gear 32 and drives the main drive motor 31 to generate electricity through the output shaft of the main drive motor 31, and the electric power generated by the main drive motor assembly 3 charges the power supply;

[0152] When in the first-gear working mode of vehicle power generation, brake A23, brake B33 and the first clutch 611 are disengaged, and the second clutch 621 is engaged. The power supply supplies power to the auxiliary motor assembly 2, and the auxiliary motor assembly 2 drives the engine 1 to enter the working mode. The power output by the engine 1 is transmitted to the output shaft 4 through the engine output shaft 11, the second clutch 621 and the second-gear gear 622 for splitting: one way of power is transmitted to the differential 51 through the main reducer gear 52 for output; the other way of power drives the main drive motor assembly 3 to generate electricity through the connecting gear 32 and the output shaft of the main drive motor 31, and the electric power generated by the main drive motor assembly 3 charges the power supply.

[0153] S3: During the vehicle braking stage,

[0154] According to the vehicle state information transmitted by the data interaction analysis layer, determine the driver's requested braking torque T br ,

[0155] If the driver's requested braking torque T br > 0, the power output working mode of the hybrid drive device is the energy braking recovery working mode. Brake B33, the first clutch 611 and the second clutch 621 are disengaged, and brake A23 is engaged. The engine 1 and the auxiliary motor assembly 2 are in the non-working state. During braking, the braking process power recovered by the differential 51 drives the main drive motor assembly 3 to generate electricity through the main reducer gear 52, the output shaft 4, the connecting gear 32 and the output shaft of the main drive motor 31, and the electric power generated by the main drive motor assembly 3 charges the power supply.

[0156] As Figure 13 , Figure 15 shown, the control method for switching between the first-gear mode and the second-gear mode of the power output working mode of the hybrid drive device in steps S1 and S2 is as follows:

[0157] Step A, information data analysis,

[0158] The data analysis system analyzes the driver's requested drive torque signal and the vehicle driving speed signal according to the vehicle state information transmitted by the data interaction management layer and transmits them to the working gear judgment strategy layer, and the working gear judgment strategy layer analyzes and obtains the target gear signal.

[0159] Step B, target demand calculation,

[0160] The shift working control strategy layer analyzes and obtains the engine 1 target demand, the main drive motor 31 target demand, and the clutch target demand according to the target gear signal and the working state information of each assembly of the hybrid drive device and transmits the target demand information to the actuator control layer.

[0161] Step C, action command execution,

[0162] The actuator control layer sends corresponding action execution commands to the engine 1, the main drive motor 31, the first clutch 611, and the second clutch 621 according to the target demand information;

[0163] The new gear clutch starts to move to the engagement point, and the original gear clutch starts to disengage. The main drive motor 31 provides power for the movement of the vehicle. If the original gear clutch is not fully disengaged, it continues to disengage until the original gear clutch is fully disengaged;

[0164] After the original gear clutch is fully disengaged, the new gear clutch starts to enter the slip friction stage;

[0165] Adjust the output speed of the engine 1. When the speed difference between the output speed of the engine 1 and the speed of the driven component of the new gear clutch is within the set threshold, adjust the output torque of the engine 1. The new gear clutch completes the engagement, and the compensation torque provided by the main drive motor 31 for the vehicle gradually decreases to zero, and the new gear starts to work.

[0166] As Figure 14 shown, the working process of the engine 1 when switching between the first-gear mode and the second-gear mode of the power output working mode of the hybrid drive device in step C is as follows:

[0167] Step C1, according to the engine 1 target demand and the current speed of the engine 1, determine the target throttle opening of the engine 1 through the engine MAP look-up table model;

[0168] Step C2, the engine controller adjusts the current throttle opening of the engine 1, thereby adjusting the output torque of the engine 1;

[0169] Step C3, determine the magnitude of the clutch output torque and the driver's requested drive torque. If the clutch output torque is less than the driver's requested drive torque, the main drive motor 31 provides power to compensate for the remaining torque required for vehicle drive until the clutch output torque reaches the driver's requested drive torque, and the main drive motor 31 stops providing power compensation, and the new gear starts to work.

[0170] Step Four, verification of action command execution,

[0171] The actuator control layer determines whether each assembly of the hybrid drive device continues to execute the action command according to the information on whether the action command is completed. If it is determined that the action command is not completed, the corresponding assembly of the hybrid drive device continues to execute the corresponding action command until the action command is completed.

[0172] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For related parts, reference can be made to the description in the method section.

[0173] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a hybrid drive device of a hybrid vehicle, characterized in that: It includes an engine (1), an auxiliary motor assembly (2), a main drive motor assembly (3), an output shaft (4), and a differential assembly (5). The auxiliary motor assembly (2) is connected to the engine (1), and the engine (1) and the main drive motor assembly (3) are connected to the differential assembly (5) through the output shaft (4); characterized in that: the auxiliary motor assembly (2) includes an auxiliary motor (21), an auxiliary motor gear (22), a brake A (23), and an auxiliary motor linkage device (24). The auxiliary motor linkage device (24) is sleeved on the engine output shaft (11) of the engine (1), and the brake A (23) can lock the auxiliary motor linkage device (24). The auxiliary motor linkage device (24) is connected to the output shaft of the auxiliary motor (21) through the auxiliary motor gear (22). A shift execution device (6) is provided between the engine output shaft (11) and the output shaft (4); The main drive motor assembly (3) includes a main drive motor (31), a connecting gear (32), and a brake B (33). The output shaft of the main drive motor (31) is connected to the output shaft (4) through the connecting gear (32), and the brake B (33) can lock the output shaft of the main drive motor (31); The shift execution device (6) includes a first gear control device (61) and a second gear control device (62); the first gear control device (61) includes a first clutch (611) and a first gear (612). The engine output shaft (11) is connected to the first gear (612) through the first clutch (611), and the first gear (612) is connected to the output shaft (4); the second gear control device (62) includes a second clutch (621) and a second gear (622). The engine output shaft (11) is connected to the second gear (622), and the second gear (622) is connected to the output shaft (4) through the second clutch (621); The differential assembly (5) includes a differential (51) and a main reduction gear (52). The differential (51) is connected to the output shaft (4) through the main reduction gear (52); Pure electric working mode, The brake B (33), the first clutch (611), and the second clutch (621) are disengaged, the brake A (23) is engaged, the engine (1) and the auxiliary motor assembly (2) are in a non-working state, and the power supply powers the main drive motor assembly (3). The power output by the main drive motor assembly (3) is transmitted to the differential (51) through the output shaft of the main drive motor (31), the connecting gear (32), the output shaft (4), and the main reduction gear (52); Engine direct drive working mode, and the engine direct drive working mode is divided into engine direct drive first gear working mode and engine direct drive second gear working mode; Engine direct drive first gear working mode, Brake A (23) and the second clutch (621) are disengaged, brake B (33) and the first clutch (611) are engaged, the main drive motor assembly (3) is in an inoperative state, the power supply powers the auxiliary motor assembly (2), the auxiliary motor assembly (2) drives the engine (1) to enter the operating mode, and the power output by the engine (1) is transmitted to the differential (51) output through the engine output shaft (11), the first clutch (611), the first gear (612), the output shaft (4), and the main reducer gear (52); Engine direct drive second gear operating mode, Brake A (23) and the first clutch (611) are disengaged, brake B (33) and the second clutch (621) are engaged, the main drive motor assembly (3) is in an inoperative state, the power supply powers the auxiliary motor assembly (2), the auxiliary motor assembly (2) drives the engine (1) to enter the operating mode, and the power output by the engine (1) is transmitted to the differential (51) output through the engine output shaft (11), the second clutch (621), the second gear (622), the output shaft (4), and the main reducer gear (52).

2. The control method of the hybrid drive device for a hybrid vehicle according to claim 1, characterized in that, it includes the following steps: Step one, information collection, The data interaction management layer collects the working state information of each assembly of the current hybrid drive device, driver intention information, and vehicle operating condition information. The driver intention information includes the driver's requested driving torque T reqe and the driver's requested braking torque T br . The vehicle operating condition information includes the state of charge SOC of the power supply and the vehicle driving speed V currrnt ; Step two, information data analysis, The data interaction and analysis layer identifies the working state information of each assembly of the hybrid drive device, the driver intention information, and the vehicle operating condition information to determine the vehicle state information, and sends the parsed vehicle state information to the vehicle control strategy layer; Step three, execute the power output working mode, The vehicle control strategy layer analyzes and calculates based on the vehicle state information, determines the power output working mode of the hybrid drive device, and issues a working mode execution command to the actuator control layer. The actuator control layer controls each assembly of the hybrid drive device to complete the corresponding action command according to the working mode execution command, and feeds back the information on whether the action command is completed to the actuator control layer. Furthermore, the hybrid drive device realizes the power output of the corresponding working mode. The action commands include the engine (1) control command, the auxiliary motor assembly (2) control command, the main drive motor assembly (3) control command, the power supply control command, the first clutch (611) control command, and the second clutch (621) control command; Step four, verification of action command execution, The actuator control layer determines whether each assembly of the hybrid drive device continues to execute the action command based on the information on whether the action command is completed. If it is determined that the action command is not completed, the corresponding assembly of the hybrid drive device continues to execute the corresponding action command until the action command is completed.

3. The control method of the hybrid drive device for a hybrid vehicle according to claim 2, characterized in that: The power output working modes of the hybrid drive device described in step three include: pure electric working mode, range extender working mode, engine direct drive working mode, hybrid drive working mode, and energy braking recovery working mode; the hybrid drive working mode includes combined drive working mode and on-road power generation working mode.

4. The control method of the hybrid drive device for a hybrid vehicle according to claim 3, characterized in that the control method of the power output working modes of the hybrid drive device is as follows: Range extender working mode, Brake A (23), Brake B (33), the first clutch (611) and the second clutch (621) are disengaged, the power supply powers the auxiliary motor assembly (2) and the main drive motor assembly (3), the auxiliary motor assembly (2) drives the engine (1) to enter the working mode, the power output by the engine (1) drives the auxiliary motor assembly (2) to generate electricity through the auxiliary motor linkage device (24) and the auxiliary motor gear (22), the electric power generated by the auxiliary motor assembly (2) charges the power supply or directly drives the main drive motor assembly (3), and the power output by the main drive motor assembly (3) is transmitted to the differential (51) output through the output shaft of the main drive motor (31), the connecting gear (32), the output shaft (4), and the main reducer gear (52); Hybrid drive working mode, the hybrid drive working mode is divided into combined drive working mode and on-road power generation working mode; Combined drive working mode, the combined drive working mode is divided into combined drive first gear working mode and combined drive second gear working mode; Combined drive first gear working mode, Brake A (23), Brake B (33) and the second clutch (621) are disengaged, the first clutch (611) is engaged, the power supply powers the auxiliary motor assembly (2) and the main drive motor assembly (3), the auxiliary motor assembly (2) drives the engine (1) to enter the working mode, the power output by the engine (1) is transmitted to the output shaft (4) through the engine output shaft (11), the first clutch (611), and the first gear (612); the power output by the main drive motor assembly (3) is transmitted to the output shaft (4) through the output shaft of the main drive motor (31) and the connecting gear (32); the two powers converge at the output shaft (11) and then are transmitted to the differential (51) output through the main reducer gear (52); Combined drive second gear working mode, Brake A (23), Brake B (33) and the first clutch (611) are disengaged, the second clutch (621) is engaged, the power supply powers the auxiliary motor assembly (2) and the main drive motor assembly (3). The auxiliary motor assembly (2) drives the engine (1) into the working mode. The power output by the engine (1) is transmitted to the output shaft (4) through the engine output shaft (11), the second clutch (621), and the second gear (622). The power output by the main drive motor assembly (3) is transmitted to the output shaft (4) through the output shaft of the main drive motor (31) and the connecting gear (32). The two powers converge at the output shaft (11) and are then transmitted to the differential (51) through the main reducer gear (52) for output. Driving power generation working mode, which is divided into the first-gear driving power generation working mode and the second-gear driving power generation working mode. First-gear driving power generation working mode Brake A (23), Brake B (33) and the second clutch (621) are disengaged, the first clutch (611) is engaged, the power supply powers the auxiliary motor assembly (2). The auxiliary motor assembly (2) drives the engine (1) into the working mode. The power output by the engine (1) is transmitted to the output shaft (4) through the engine output shaft (11), the first clutch (611), and the first gear (612) and then is branched: one path of power is transmitted to the differential (51) through the main reducer gear (52) for output; the other path of power drives the main drive motor assembly (3) to generate electricity through the connecting gear (32) and the output shaft of the main drive motor (31). The generated electric power of the main drive motor assembly (3) charges the power supply. Second-gear driving power generation working mode Brake A (23), Brake B (33) and the first clutch (611) are disengaged, the second clutch (621) is engaged, the power supply powers the auxiliary motor assembly (2). The auxiliary motor assembly (2) drives the engine (1) into the working mode. The power output by the engine (1) is transmitted to the output shaft (4) through the engine output shaft (11), the second clutch (621), and the second gear (622) and then is branched: one path of power is transmitted to the differential (51) through the main reducer gear (52) for output; the other path of power drives the main drive motor assembly (3) to generate electricity through the connecting gear (32) and the output shaft of the main drive motor (31). The generated electric power of the main drive motor assembly (3) charges the power supply. Energy braking recovery working mode Brake B (33), the first clutch (611), and the second clutch (621) are disengaged, Brake A (23) is engaged, the engine (1) and the auxiliary motor assembly (2) are in the non-working state. During the braking process, the braking process power recovered by the differential (51) drives the main drive motor assembly (3) to generate electricity through the main reducer gear (52), the output shaft (4), the connecting gear (32), and the output shaft of the main drive motor (31). The generated electric power of the main drive motor assembly (3) charges the power supply.

5. The control method of the hybrid drive device for a hybrid vehicle according to claim 2, characterized in that: The determination steps for determining the power output working mode of the hybrid drive device in step 3 are as follows: S1: During the vehicle startup phase, judge the state of charge (SOC) of the power supply according to the vehicle state information transmitted by the data interaction and analysis layer; If the state of charge (SOC) of the power supply is greater than the SOC of the extended-range operation mode start threshold state of charge switch , the power output operation mode of the hybrid drive device is the pure electric operation mode; If the state of charge (SOC) of the power supply < the state of charge (SOC) of the extended-range operation mode start threshold switch and the state of charge (SOC) of the power supply < the state of charge (SOC) of the power supply start threshold L , the power output operation mode of the hybrid drive device is the engine direct drive operation mode. According to the working requirements, it is determined to use the engine direct drive first gear operation mode or the engine direct drive second gear operation mode; S2: During the vehicle driving phase, During the vehicle driving stage, determine the driver's requested driving torque T reqe and the driver's requested braking torque T br , If the driver requests a driving torque T reqe < 0, the driver requests a braking torque T br > 0, the power output working mode of the hybrid drive device is the range extender working mode; If the driver requests a driving torque T reqe > 0, determine the vehicle driving speed V currrnt , the driver's requested driving torque T reqe shall take precedence over the vehicle driving speed V currrnt for determination. When the vehicle driving speed V currrnt <engine driving vehicle speed V switch the power output working mode of the hybrid drive device is the range-extending working mode; When the vehicle driving speed V currrnt > the engine driving speed V switch , continue to determine the driver-requested driving torque T reqe , If T reqe > the maximum torque threshold T for the efficient operation of the engine max , the power output working mode of the hybrid drive device is the combined drive working mode, and according to the working requirements, it is determined to use the combined drive first gear working mode or the combined drive second gear working mode; If the minimum torque threshold T for the engine to operate efficiently min <T reqe <the maximum torque threshold T for the engine to operate efficiently max , the power output working mode of the hybrid drive device is the engine direct drive working mode. According to the working requirements, it is determined to use the engine direct drive first gear working mode or the engine direct drive second gear working mode; If T reqe <the minimum torque threshold T for the efficient operation of the engine min , the power output working mode of the hybrid drive device is the driving power generation mode. According to the working requirements, it is determined to use the first gear working mode or the second gear working mode of driving power generation; S3: During the vehicle braking phase, Determine the driver's requested braking torque T based on the vehicle state information transmitted by the data interaction and parsing layer br , If the driver requests a braking torque T br > 0, the power output operating mode of the hybrid drive device is the energy braking recovery operating mode.

6. The control method of the hybrid drive device for a hybrid vehicle according to claim 5, characterized in that: The control method for switching between the first gear mode and the second gear mode of the power output working mode of the hybrid drive device in steps S1 and S2 is as follows: Step A, information data analysis, The data analysis system analyzes the driver's requested drive torque signal and the vehicle driving speed signal according to the vehicle state information transmitted by the data interaction management layer and transmits them to the working gear judgment strategy layer, and the working gear judgment strategy layer analyzes and obtains the target gear signal; Step B, target demand calculation, The shift work control strategy layer analyzes and obtains the engine (1) target demand, the main drive motor (31) target demand, and the clutch target demand according to the target gear signal and the working state information of each assembly of the hybrid drive device, and transmits the target demand information to the actuator control layer; Step C, action command execution, The actuator control layer issues corresponding action execution commands to the engine (1), the main drive motor (31), the first clutch (611), and the second clutch (621) according to the target demand information, The new gear clutch starts to move to the engagement point, the original gear clutch starts to disengage, and the main drive motor (31) provides power for the vehicle movement. If the original gear clutch is not completely disengaged, it continues to disengage until the original gear clutch is completely disengaged. After the original gear clutch is completely disengaged, the new gear clutch starts to enter the slip friction stage. Adjust the engine (1) output speed. When the speed difference between the engine (1) output speed and the driven component speed of the new gear clutch is within the set threshold, adjust the engine (1) output torque. The new gear clutch completes the engagement, and the compensation torque provided by the main drive motor (31) for the vehicle gradually decreases to zero, and the new gear starts to work.

7. The control method of the hybrid drive device for a hybrid vehicle according to claim 6, characterized in that: The working process of the engine (1) when switching between the first gear mode and the second gear mode of the power output working mode of the hybrid drive device in step C is as follows: Step C1, determine the target throttle opening of the engine (1) through the engine look-up table model according to the engine (1) target demand and the current engine speed; Step C2, the engine controller adjusts the current throttle opening of the engine (1) to adjust the engine (1) output torque. Step C3: Determine the magnitudes of the clutch output torque and the driver-requested driving torque. If the clutch output torque is less than the driver-requested driving torque, the main drive motor (31) provides power to compensate for the remaining torque required for vehicle driving until the clutch output torque reaches the driver-requested driving torque, at which point the main drive motor (31) stops providing power compensation and the new gear starts to operate.

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