CN110816248B - Power transmission system of hybrid vehicle and hybrid vehicle - Google Patents

Abstract

A power transmission system of a hybrid vehicle and a hybrid vehicle, the power transmission system comprises a first planetary gear mechanism; a second planetary gear mechanism; a third planetary gear mechanism; an input element connected to a third planet carrier; an output element, connected with the third ring gear; the first motor, the first planet carrier is fixedly connected with its rotor; the second motor, the first sun gear is fixedly connected with its rotor; the first clutch is connected between the first sun gear and the first brake; The second clutch is connected between the first sun gear and the second ring gear; the first brake, the first planet carrier is connected with the first brake; the second brake is connected with the second ring gear at one end; the first planet carrier is connected with the first The second sun gear, the first ring gear and the third sun gear, and the second planet carrier and the third ring gear are respectively fixedly connected. The power transmission system realizes a variety of working modes through the rational layout of the planetary row, improves the performance of the transmission system, and further obtains higher transmission efficiency.

Description

Power transmission system of hybrid vehicle and hybrid vehicle

technical field

The present invention relates to the technical field of hybrid electric vehicles, in particular to a power transmission system of a hybrid electric vehicle and a hybrid electric vehicle.

Background technique

With the increasingly strict environmental protection measures around the world, hybrid vehicles have become a focus of automotive research and development due to their energy-saving and low-emission characteristics. Under the current technical level and application conditions, hybrid vehicles are the most industrialized and market-oriented models of electric vehicles. The hybrid vehicle uses the internal combustion engine and the electric motor as the hybrid power source, which not only has the advantages of good power, fast response and long working time of the fuel engine, but also has the advantages of no pollution and low noise of the electric motor, and achieves the best match between the engine and the electric motor. .

At present, the drive system of a hybrid vehicle mainly includes three basic forms: series, parallel and hybrid (power split type). There is no mechanical connection between the engine and the output shaft in the series mode, which can realize the optimal control of speed/torque, but all its energy needs to be converted twice between mechanical power/electric power before it can be transmitted to the output shaft, and the loss is large ;The efficiency of parallel transmission is high, but the mechanical connection between the engine and the output shaft cannot guarantee that the engine is always in a better working area, and is usually used for medium and high speed; the hybrid combination combines the advantages of series and parallel, which can not only realize the optimization of the engine However, when the vehicle starts, the limit power of the motor is required to be high, and the efficiency is low. Based on the above analysis, the ideal drive scheme is based on a hybrid power drive system, which can realize functions such as pure electric start, medium and low speed power split, and medium and high speed engine direct drive or parallel drive.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a power transmission system and a hybrid vehicle for a hybrid vehicle that can realize functions such as pure electric start, medium and low speed power split, and medium and high speed engine direct drive or parallel drive.

The present invention provides a power transmission system for a hybrid vehicle, comprising a first planetary gear mechanism, including a first sun gear, a first planetary gear, a first planet carrier and a first ring gear, wherein the first planetary gear is arranged on the the first planet carrier, and the first planet gears are respectively meshed with the first sun gear and the first ring gear;

The second planetary gear mechanism includes a second sun gear, a second planetary gear, a second planetary carrier and a second ring gear, the second planetary gear is arranged on the second planetary carrier, and the second planetary gears are respectively meshing with the second sun gear and the second ring gear;

The third planetary gear mechanism includes a third sun gear, a third planetary gear, a third planetary carrier and a third ring gear, the third planetary gear is arranged on the third planetary carrier, and the third planetary gears are respectively meshing with the third sun gear and the third ring gear;

an input element, connected with the output shaft of the engine, and connected with the third planet carrier;

an output element, connected with the third ring gear;

a first motor, the first planet carrier is fixedly connected to the rotor of the first motor;

a second electric motor, the first sun gear is fixedly connected to the rotor of the second electric motor;

the first clutch;

a second clutch connected between the first sun gear and the second ring gear;

a first brake, the other one of the first sun gear and the first planet carrier is connected to one end of the first brake, and the first clutch is connected to the first sun gear and the first between one of the planet carriers and one end of the first brake; and

a second brake, one end of the second brake is connected to the second ring gear;

The first planet carrier is also fixedly connected to the second sun gear, the first ring gear is fixedly connected to the third sun gear, and the second planet carrier is fixedly connected to the third ring gear .

Further, the power transmission system of the hybrid vehicle further includes a third clutch connected between the input element and the third planet carrier.

Further, the first clutch is connected between the first sun gear and one end of the first brake, and the first planet carrier is connected to one end of the first brake.

Further, the power transmission system of the hybrid vehicle includes the following working modes:

First E-CVT mode: the first brake is disengaged, the second brake is engaged, the first clutch and the second clutch are disengaged, the third clutch is engaged, and the engine is input through the input element power;

Second E-CVT mode: both the first brake and the second brake are disengaged, the first clutch is disengaged, the second clutch and the third clutch are engaged, the engine is input through the input element power;

The first pure electric mode: the first brake is disengaged, the second brake is engaged, the first clutch is engaged, and the second clutch and the third clutch are disengaged;

The second pure electric mode: the first brake is disengaged, the second brake is engaged, the first clutch and the third clutch are disengaged, and the second clutch is engaged;

The third pure electric mode: the first brake is engaged, the second brake is disengaged, the first clutch and the third clutch are disengaged, and the second clutch is engaged;

Fourth pure electric mode: the first brake and the second brake are disconnected, the first clutch and the second clutch are engaged, and the third clutch is disconnected;

First engine direct drive/parallel mode: the first brake is disengaged, the second brake is engaged, the first and third clutches are engaged, the second clutch is disengaged, the engine is The input element input power;

Second engine direct drive/parallel mode: the first brake is disengaged, the second brake is engaged, the first clutch is disengaged, the second clutch and the third clutch are engaged, the engine passes the input Component input power;

Third engine direct drive/parallel mode: the first brake is engaged, the second brake is disengaged, the first clutch is disengaged, the second clutch and the third clutch are engaged, the engine passes the input Component input power;

Fourth engine direct drive/parallel mode: the first and second brakes are disengaged, the first and second clutches are engaged, the third clutch is engaged and disengaged, and the engine passes through the input Component input power.

Further, the power transmission system of the hybrid vehicle further includes the following working modes:

The engine restart mode in the first pure electric mode: the first brake is disengaged, the second brake is engaged, the first clutch and the third clutch are engaged, the second clutch is disengaged, the first A motor and the second motor drive the input element to rotate through the third planet carrier;

Engine restart mode in the second pure electric mode: the first brake is disengaged, the second brake is engaged, the first clutch is disengaged, the second clutch and the third clutch are engaged, the first A motor drives the input element to rotate through the third planet carrier;

Engine restart mode in the third pure electric mode: the first brake is engaged, the second brake is disengaged, the first clutch is disengaged, the second clutch and the third clutch are engaged, the first Two motors drive the input element to rotate through the third planet carrier;

Engine restart mode in the fourth pure electric mode: the first brake and the second brake are disengaged, the first clutch, the second clutch and the third clutch are engaged, the first electric motor and the The second motor drives the input element to rotate through the third planet carrier.

Further, the power transmission system of the hybrid vehicle further includes the following working modes:

The first braking energy recovery mode: the first brake is disengaged, the second brake is engaged, the first clutch is engaged, the second clutch and the third clutch are disengaged, and the output element drives the the third ring gear rotates;

The second braking energy recovery mode: the first brake is disengaged, the second brake is engaged, the first clutch and the third clutch are disengaged, the second clutch is engaged, and the output element drives the the third ring gear rotates;

The third braking energy recovery mode: the first brake is engaged, the second brake is disengaged, the first clutch and the third clutch are disengaged, the second clutch is engaged, and the output element drives the the third ring gear rotates;

Fourth braking energy recovery mode: the first brake and the second brake are disengaged, the first clutch and the second clutch are engaged, the third clutch is disengaged, and the output element drives the The third ring gear rotates.

Further, the power transmission system of the hybrid vehicle further includes the following working modes:

Engine restart mode in the first braking energy recovery mode: the first brake is disengaged, the second brake is engaged, the first clutch and the third clutch are engaged, the second clutch is disengaged, and the The output element drives the third ring gear to rotate, and drives the input element to rotate through the third planet carrier;

Engine restart mode in the second braking energy recovery mode: the first brake is disengaged, the second brake is engaged, the first clutch is disengaged, the second clutch and the third clutch are engaged, so The output element drives the third ring gear to rotate, and drives the input element to rotate through the third planet carrier;

Engine restart mode in the third braking energy recovery mode: the first brake is engaged, the second brake is disengaged, the first clutch is disengaged, the second clutch and the third clutch are engaged, so The output element drives the third ring gear to rotate, and drives the input element to rotate through the third planet carrier;

Engine restart mode in the fourth braking energy recovery mode: the first brake and the second brake are disengaged, the first clutch, the second clutch and the third clutch are engaged, the output element The third ring gear is driven to rotate, and the input element is driven to rotate through the third planet carrier.

The present invention also provides a hybrid vehicle, including the above-mentioned power transmission system for the hybrid vehicle.

The power transmission system of the hybrid vehicle of the present invention provides a basic three-planetary-row planetary gear configuration through the reasonable layout of the planetary row mechanical structure, realizes the dual-mode E-CVT working mode, and obtains higher system efficiency; Different combinations of components realize more working modes; thereby further improving the performance of the transmission system and further obtaining higher transmission efficiency, specifically, the power transmission system can achieve:

1. The dual-mode E-CVT working mode makes the engine always run in the economic zone, which greatly improves the economy.

2. Multi-speed pure electric mode, so that the motor always runs in its high-efficiency area in pure electric mode, which further improves the economy.

3. In the engine direct drive mode, there are multiple fixed speed ratio working modes, which further reduces the electric power and improves the system efficiency; and the introduction of the fixed speed ratio can eliminate the stall of the motor, reduce the loss of the motor, and improve the life of the motor.

4. The parallel drive mode of multiple engines and motors, with a parallel drive mode covering low, medium and high speed sections, ensures that the transmission has relatively excellent power performance in each speed section.

5. Multiple braking energy recovery modes; with braking energy recovery modes covering low, medium and high speed sections, to ensure that the braking capacity of each speed section can be fully utilized.

6. Provides multiple engine restart modes, which are convenient for shutting down the engine and restarting the engine at will in each speed segment; improving efficiency and reducing fuel consumption.

Description of drawings

1 is a schematic structural diagram of a power transmission system of a hybrid vehicle according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a first E-CVT mode;

3 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a second E-CVT mode;

FIG. 4 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a first pure electric mode;

FIG. 5 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a second pure electric mode;

FIG. 6 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a third pure electric mode;

FIG. 7 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a fourth pure electric mode;

8 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a first engine direct drive/parallel mode;

9 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a second engine direct drive/parallel mode;

10 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a third engine direct drive/parallel mode;

FIG. 11 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a fourth engine direct drive/parallel mode;

FIG. 12 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a first braking capacity recovery mode;

13 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a second braking capacity recovery mode;

FIG. 14 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a third braking capacity recovery mode;

15 is a schematic diagram of the power transmission system of the hybrid vehicle shown in FIG. 1 in a fourth braking capacity recovery mode;

FIG. 16 is a schematic diagram of the engine restart mode in the first pure electric mode of the power transmission system of the hybrid vehicle shown in FIG. 1;

17 is a schematic diagram of an engine restart mode in a second pure electric mode of the power transmission system of the hybrid vehicle shown in FIG. 1;

18 is a schematic diagram of an engine restart mode in a third pure electric mode of the power transmission system of the hybrid vehicle shown in FIG. 1;

19 is a schematic diagram of an engine restart mode in a fourth pure electric mode of the power transmission system of the hybrid vehicle shown in FIG. 1;

20 is a schematic diagram of an engine restart mode in a first braking energy recovery mode of the power transmission system of the hybrid vehicle shown in FIG. 1;

21 is a schematic diagram of an engine restart mode in a second braking energy recovery mode of the power transmission system of the hybrid vehicle shown in FIG. 1;

22 is a schematic diagram of an engine restart mode in a third braking energy recovery mode of the power transmission system of the hybrid vehicle shown in FIG. 1;

FIG. 23 is a schematic diagram of an engine restart mode in a fourth braking energy recovery mode of the power transmission system of the hybrid vehicle shown in FIG. 1 .

Detailed ways

In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific embodiments, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and examples.

As shown in FIG. 1 , an embodiment of the present invention provides a power transmission system for a hybrid vehicle, including an input element 10 connected to an engine output shaft, an output element 12 , a first electric motor 14 , a second electric motor 16 , and a first planetary The gear mechanism 18 , the second planetary gear mechanism 20 , the third planetary gear mechanism 22 , the first clutch 24 , the second clutch 26 , the first brake 28 and the second brake 30 .

The first planetary gear mechanism 18 includes a first sun gear 182 , a first planetary gear 184 , a first planetary carrier 186 and a first ring gear 188 , the first planetary gear 184 is provided on the first planetary carrier 186 , and the first planetary gear 184 They mesh with the first sun gear 182 and the first ring gear 188, respectively. The second planetary gear mechanism 20 includes a second sun gear 202 , a second planetary gear 204 , a second planetary carrier 206 and a second ring gear 208 , the second planetary gear 204 is provided on the second planetary carrier 206 , and the second planetary gear 204 Engage with the second sun gear 202 and the second ring gear 208, respectively. The third planetary gear mechanism 22 includes a third sun gear 222 , a third planetary gear 224 , a third planetary carrier 226 and a third ring gear 228 , the third planetary gear 224 is provided on the third planetary carrier 226 , and the third planetary gear 224 Engage with the third sun gear 222 and the third ring gear 228, respectively.

The input element 10 is connected to the third planet carrier 224 , the output element 12 is connected to the third ring gear 228 ; the first sun gear 182 is fixedly connected to the rotor of the second motor 16 , and the first planet carrier 186 is fixed to the rotor of the first motor 14 The first planet carrier 186 is also fixedly connected with the second sun gear 202, the first sun gear 182 is connected with the second ring gear 208 through the second clutch 26, and the first ring gear 188 is fixedly connected with the third sun gear 222; A clutch 24 is connected between one end of the first brake 28 and the first sun gear 182, one end of the first brake 28 is also connected to the first planet carrier 186, one end of the second brake 30 is connected to the second ring gear 208, the first The second planetary carrier 206 is fixedly connected with the third ring gear 228 .

Through the power transmission system of the hybrid vehicle of the present invention, various working modes, such as dual mode, can be realized through different states of opening or connection of the first clutch 24 , the second clutch 26 , the first brake 28 and the second brake 30 E-CVT (Electronic Continuously Variable Transmission) mode, multi-speed pure electric mode, multi-speed engine direct drive mode, multi-speed parallel drive mode, multi-speed braking capacity recovery mode and multi-speed fixed gear restart engine mode.

In this embodiment, the power transmission system of the hybrid vehicle further includes a third clutch 32, which is connected between the input element 10 and the third planet carrier 224, so as to operate in the braking energy recovery mode and the pure electric driving mode When working, the connection between the engine and the system is cut off, and the energy loss caused by the inertia of the engine to the system is reduced. It can be understood that the third clutch 32 can also be omitted.

In another embodiment, one end of the first brake 28 may not be connected to the first planet carrier 186, and the first clutch 24 may not be connected between one end of the first brake 28 and the first sun gear 182, so that the first One end of the brake 28 is connected with the first sun gear 182 , and the first clutch 24 is connected between one end of the first brake 28 and the first planet carrier 186 . In both manners, the first planetary gear mechanism 18 can be fully rotated through the first clutch 24 .

In this embodiment, the functions of the first clutch 24 , the second clutch 26 and the third clutch 32 are to achieve fixed connection and separation between the two components, and may be a multi-plate wet clutch or a dog-tooth clutch.

In this embodiment, the connection between the first sun gear 182 and the rotor of the second motor 16, the connection between the first planet carrier 186 and the second sun gear 202, the connection between the second planet carrier 206 and the third ring gear 228, the connection between the first planet carrier 186 and the second sun gear 202, the The connection between a ring gear 188 and the third sun gear 222 and the connection between the rotor of the first electric motor 14 and the first planet carrier 186 can be fixedly connected by splines, welding, or integral molding.

In this embodiment, in the power transmission system of the hybrid vehicle, K1 , K2 , and K3 are the gear ratio of the first ring gear 188 and the first sun gear 182 , and the number of teeth of the second ring gear 208 and the second sun gear 202 , respectively. ratio, the gear ratio of the third ring gear 228 and the third sun gear 222, that is, K1=Z _{first ring gear} /Z _{first sun gear} , K2=Z _{second ring gear} /Z _{second sun gear} , K3=Zth _{Three ring gears} /Z _{third sun gear} (Z _{first ring gear} , Z _{first sun gear} , Z _{second ring gear} , Z _{second sun gear} , Z _{third ring gear} , Z _{third sun gear} , respectively the first number of teeth of the ring gear 188, the first sun gear 182, the second ring gear 208, the second sun gear 202, the third ring gear 228, and the third sun gear 222).

Hereinafter, various operating modes of the power transmission system of the hybrid vehicle will be described in detail with reference to FIGS. 2 to 23 , where ⊕ in FIGS. 2 to 23 indicates that the clutch or brake is engaged.

1. The first E-CVT mode

As shown in FIG. 2 , the first brake 28 is disengaged, the second brake 30 is engaged, the first clutch 24 and the second clutch 26 are disengaged, and the third clutch 32 is engaged. At this time, the engine is operated and the first electric motor 14 is used as an electric motor. , the second electric motor 16 acts as a generator to generate electricity, and the electricity generated by the second electric motor 16 directly drives the first electric motor 14 . In this mode, the speed ratio per hour at the mechanical point (that is, the engine is at the best working point) is: (K2+(K2+1)/K1)/(K3+1)+1. When the vehicle speed is lower than the mechanical point, the power transmission system has a higher speed ratio. High transmission efficiency, so the first E-CVT mode is suitable for low vehicle speed conditions.

In the first E-CVT mode, since the first motor 14 is connected to the first planet carrier 186, the first motor 14 inputs power to the first planet carrier 186, and the second motor 16 is connected to the first sun gear 182 to drive the first sun gear. The wheel 182 rotates, and the first ring gear 188 outputs power. Since the first planet carrier 186 is also connected with the second sun gear 202, and the second brake 30 is engaged and connected with the second ring gear 208, the second ring gear 208 Not moving, the second sun gear 202 inputs power, and the second planet carrier 206 outputs power; since the second planet carrier 206 is connected with the third ring gear 228, the first ring gear 188 is connected with the third sun gear 182, and the input element 10 The third clutch 32 is connected to the third planetary carrier 226, so the third planetary carrier 226 and the third sun gear 182 input power respectively, and the input power is coupled with the output power of the second planetary carrier 206, and then the third ring gear 228 outputs the output power. Element 12 outputs power. In this process, the first electric motor 14 acts as a motor, the second electric motor 16 acts as a generator, and the second electric motor 16 also plays the role of speed regulation in the connection with the first planetary gear mechanism 18, so that the entire power transmission system can be realized The stepless speed change, that is, changing the rotational speed of the second electric motor 16 , will change the rotational speed of the first ring gear 188 , thereby changing the rotational speed of the third sun gear 202 , which in turn changes the third ring gear in the power coupling of the third planetary gear mechanism 22 . 228 rpm with infinitely variable speed.

2. The second E-CVT mode

As shown in FIG. 3 , both the first brake 28 and the second brake 30 are disconnected, the first clutch 24 is disconnected, and the second clutch 26 and the third clutch 32 are engaged. At this time, the engine works and the first motor 14 acts as a generator Electricity is generated and the second electric motor 16 is driven, and the second electric motor 16 is used as a motor. In this mode, the speed ratios of the two mechanical points are I1=(K2+(K2+1)/K1)/(K3+1)+1, I2=(K2-(K2+(K2+1)/K1)/( K3+1))/(K2+1), when the vehicle speed is between two mechanical points, it has higher transmission efficiency, so the second E-CVT mode is suitable for medium and high speed conditions.

In the second E-CVT mode, the second motor 16 drives the first sun gear 182 as the input of the first planetary gear mechanism 18 , the first motor 14 rotates together with the first planet carrier 186 as the input of the first planetary gear mechanism 18 , The first ring gear 188 is used as the output of the first planetary gear mechanism 18; the second motor 16 drives the second ring gear 208 as the input of the second planetary gear mechanism 20, the first motor 14 passes through the first planet carrier 186 and the second sun gear 202 rotates together as the input of the second planetary gear mechanism 20, the second planet carrier 206 is used as the output of the second planetary gear mechanism 20; the third planet carrier 226 is connected with the input element 10 as the input of the third planetary gear mechanism 22, the third planetary gear mechanism 22. The sun gear 222 is connected to the first ring gear 188 as the input of the third planetary gear mechanism 22 . The input power is coupled with the output power of the second planet carrier 206 and the third ring gear 228 outputs power to the output element 12 . In this process, the first electric motor 14 acts as a generator, the second electric motor 16 acts as an electric motor, and the first electric motor 14 also plays the role of speed regulation in the connection of the first planetary gear mechanism 18, so that the entire power transmission system realizes stepless The speed change, that is, changing the rotational speed of the first electric motor 14 , will change the rotational speed of the first planetary carrier 186 , which in turn will change the rotational speed of the first ring gear 188 , thereby changing the rotational speed of the third sun gear 202 , which in turn will change the rotational speed of the third planetary gear mechanism 22 . In the power coupling, the rotational speed of the third ring gear 228 is changed to achieve a continuously variable speed change.

3. The first pure electric mode

As shown in FIG. 4 , the first brake 28 is disengaged, the second brake 30 is engaged, the first clutch 24 is engaged, the second clutch 26 and the third clutch 32 are disengaged, at this time, the engine does not work, the first motor 14 and the third clutch 32 are disconnected. The two motors 16 are both used as motors, regardless of master and slave. In this mode, the speed ratio is: K2+1, which can be used for low-speed conditions such as vehicle starting and traffic congestion.

In the first pure electric mode, both ends of the first clutch 24 are respectively connected to the first planet carrier 186 and the first sun gear 182, the engagement of the first clutch 24 makes the first planetary gear mechanism 18 a rotating whole, the first motor 14 and The second motor 16 drives the first planetary gear mechanism 18 to rotate as a whole; the first planet carrier 186 transmits the power to the second sun gear 202 and transmits the power to the second planet carrier 206 for output to transmit the power to the output element 12 (the second tooth The ring 208 is locked due to the engagement of the second brake 30).

4. The second pure electric mode

As shown in FIG. 5 , the first brake 28 is disengaged, the second brake 30 is engaged, the first clutch 24 and the third clutch 32 are disengaged, and the second clutch 26 is engaged, at this time, the engine does not work, and the first motor 14 acts as a motor In use, the second motor 16 does not work. In this mode, the speed ratio is: K2+1. When one motor is sufficient to drive, using this mode can reduce the drag loss of the motor. Moreover, the third clutch 32 is disconnected in this mode, so that the loss caused by the inertia of the engine can be reduced.

In the second pure electric mode, the first electric motor 14 drives the first planet carrier 186 as the input of the first planetary gear mechanism 18 , the first sun gear 182 is locked by connecting with the engaged second brake 30 through the second clutch 26 , and the first The planet carrier 186 transmits power to the first ring gear 188, and then outputs power through the first ring gear 188; the second sun gear 202 is connected to the first planet carrier 186 to input power to the second planetary gear mechanism 20, the second The ring 208 is connected with the second brake 30 to be locked, the second sun gear 202 transmits power to the second planet carrier 206, and outputs through the second planet carrier 206; the third sun gear 222 is connected to the first ring gear 188 to input power , and coupled with the power transmitted from the second planet carrier 206 , and output to the output element 12 through the third ring gear 228 .

5. The third pure electric mode

As shown in FIG. 6 , the first brake 28 is engaged, the second brake 30 is disengaged, the first clutch 24 and the third clutch 32 are disengaged, and the second clutch 26 is engaged. At this time, the engine does not work and the first electric motor 14 does not work. , the second motor 16 is used as a motor. In this mode, the speed ratio is: (K2+1)/K2. When one motor is sufficient to drive, using this mode can reduce the drag loss of the motor.

In the third pure electric mode, the second electric motor 16 transmits power to the first sun gear 182, the first planet carrier 186 is locked due to the connection with the engaged first brake 28, and thus the first sun gear 182 transmits power to the first sun gear 182. A planetary gear 184 is output by the first ring gear 188; the second motor 16 also transmits power to the second ring gear 208 through the second clutch 26, as the input of the second planetary gear mechanism 20, the second sun gear 202 due to The second planetary gear 204 is engaged with the second ring gear 208 to output power to the second planetary carrier 206; the third sun gear 222 is connected to the first ring gear 188 to input power, and the third The planet carrier 226 is connected and locked with the third clutch 32 , the third sun gear 222 drives the third planet gear 224 to rotate, and is coupled with the power transmitted from the second planet carrier 206 to output to the output element 12 through the third ring gear 228 .

6. The fourth pure electric mode

As shown in FIG. 7 , the first brake 28 and the second brake 30 are disengaged, the first clutch 24 and the second clutch 26 are engaged, and the third clutch 32 is disengaged. At this time, the engine does not work, the first motor 14 and the second The electric motors 16 are all used as electric motors, regardless of master and slave. This mode is pure electric direct gear with a speed ratio of 1. Moreover, the third clutch 32 is disconnected in this mode, so that the loss caused by the inertia of the engine can be reduced.

In the fourth pure electric mode, both ends of the first clutch 24 are respectively connected to the first planet carrier 186 and the first sun gear 182, the engagement of the first clutch 24 makes the first planetary gear mechanism 18 a rotating whole, the first motor 14 and The second motor 16 drives the first planetary gear mechanism 18 to rotate together; both ends of the second clutch 26 are connected to the second ring gear 208 and the second sun gear 202 respectively, and the engagement of the second clutch 26 makes the second planetary gear mechanism 20 a single Rotating the whole, the first motor 14 and the second motor 16 together drive the second planetary gear mechanism 20 to rotate as a whole; the first ring gear 188 and the second planet carrier 206 transmit power to the third sun gear 222 and the third ring gear 228 respectively , to jointly drive the third ring gear 228 to be transmitted to the output element 12 .

7. The first engine direct drive/parallel mode

As shown in FIG. 8 , the first brake 28 is disengaged, the second brake 30 is engaged, the first clutch 24 and the third clutch 32 are engaged, and the second clutch 26 is disengaged. At this time, the engine works, the first motor 14 and the second The electric motors 16 can both be used as generators and electric motors, regardless of master and slave, depending on the specific needs of the vehicle and engine operating conditions. When the power provided by the engine is insufficient, two motors can be used to provide additional rotation. When the engine is running in the economic zone, but the output power is excessive, the two electric motors can also be used as generators, and the two electric motors are driven by the engine to generate electricity to charge the battery pack of the car . In this mode, the fixed speed ratio is: 1+K2/(1+K3).

In the direct drive/parallel mode of the first engine, both ends of the first clutch 24 are connected to the first planet carrier 186 and the first sun gear 182 respectively, and the engagement of the first clutch 24 makes the first planetary gear mechanism 18 a rotating whole. When the output power is excessive, the first electric motor 14 and the second electric motor 16 are used as generators, and the engine transmits the power to the input element 10, and then transmits the power to the third planet carrier 226 and the third ring gear 228. The power is output to the output element 12. During this process, the third ring gear 228 and the third sun gear 222 rotate, the third ring gear 228 drives the second planet carrier 206 to rotate, and then drives the second sun gear 202 to rotate, and the third sun gear 228 rotates. The wheel 222 drives the first ring gear 188 to rotate, and due to the integral rotation of the first planetary gear mechanism 18, the second ring gear 208 is locked by the second brake 30, and the second sun gear 202 rotates together with the first planetary gear mechanism 18. The first planet carrier 186 connected with the first electric motor 14 and the first sun gear 182 connected with the second electric motor 16 are both driven to rotate, so that the rotors of the first electric motor 14 and the second electric motor 16 are rotated to generate electricity, and the engine is in a direct drive mode Independent output power. When the output power of the engine is insufficient, the first electric motor 14 and the second electric motor 16 are used as electric motors, the first electric motor 14 and the second electric motor 16 together drive the first planetary gear mechanism 18 to rotate as a whole, and the power of the two electric motors all the way from the first electric motor The ring gear 188 is transmitted to the third sun gear 222 as the input of the third planetary gear mechanism 22, all the way from the first planet carrier 186 to the second sun gear 202, the second planet carrier 206 and then to the third ring gear 228, the engine The power is transmitted to the third planetary carrier 226 via the input element 10 as the input of the third planetary gear mechanism 22, so that the power is output from the third ring gear 228 to the output element 12 after the third planetary gear mechanism 22 is coupled, and the first motor 14. The second electric motor 16 and the engine jointly output power in a parallel manner.

8. Second engine direct drive/parallel mode

As shown in FIG. 9 , the first brake 28 is disengaged, the second brake 30 is engaged, the first clutch 24 is disengaged, the second clutch 26 and the third clutch 32 are engaged, at this time, the engine works and the second electric motor 16 does not work, The first electric motor 14 can be used as both a generator and an electric motor, depending on the specific needs of the vehicle and the engine operating conditions. When the power provided by the engine is insufficient, the first electric motor 14 can provide additional torque to achieve The parallel drive mode increases the power of the system. When the engine is running in the economic zone, but the output power is excessive, the first electric motor 14 can also be used as a generator, and the first electric motor 14 is driven by the engine to generate electricity to charge the battery pack of the car. In this mode, the fixed speed ratio is: (K2+(K2+1)/K1)/(K3+1)+1.

In the second engine direct drive/parallel mode, the second ring gear 208 is locked by the second brake 30, and the first sun gear 182 is connected to the second ring gear 208 to be locked. When the output power of the engine is excessive, the first motor 14 acts as a The generator is used, and the engine transmits the power to the input element 10, and then transmits it to the third planet carrier 226 and the third ring gear 228, and the third ring gear 228 outputs the power to the output element 12. During this process, the third gear The ring 228 and the third sun gear 222 rotate, the third ring gear 228 drives the second planet carrier 206 to rotate, and then drives the second sun gear 202 to rotate to drive the first planet carrier 186 to rotate, and the third sun gear 222 drives the first ring gear 188 rotates, the first planet carrier 186 and the first ring gear 188 are coupled to drive the rotor of the first motor 14 to rotate to generate electricity, and the engine independently outputs power in a direct drive manner. When the output power of the engine is insufficient, the first electric motor 14 is used as an electric motor, and the first electric motor 14 transmits power to the second sun gear 202 via the first planet carrier 186 and transmits the power to the third sun gear 222 via the first ring gear 188 , the power transmitted to the second sun gear 202 is output from the second planet carrier 206; the power transmitted to the third sun gear 222 is used as the input of the third planetary gear mechanism 22, and the power transmitted by the engine through the input element 10 is passed through the third planet carrier 226 as an input, the input power is coupled with the power transmitted from the second planet carrier 206 to the third ring gear 228, and output from the third ring gear 228 to the output element 12, the first motor 14 and the engine jointly output power in parallel .

9. The third engine direct drive/parallel mode

As shown in FIG. 10 , the first brake 28 is engaged, the second brake 30 is disengaged, the first clutch 24 is disengaged, the second clutch 26 and the third clutch 32 are engaged, at this time, the engine works and the first motor 14 does not work, The second electric motor 16 can be used as both a generator and an electric motor, depending on the specific requirements of the vehicle and the engine operating conditions. When the power provided by the engine is insufficient, the second electric motor 16 can provide additional torque to achieve The parallel driving mode increases the power of the system. When the engine is running in the economic zone, but the output power is excessive, the second electric motor 16 can also be used as a generator, and the second electric motor 16 is driven by the engine to generate electricity to charge the battery pack of the car. In this mode, the fixed speed ratio is: (K2-(K2+(K2+1)/K1)/(K3+1))/(K2+1).

In the third engine direct drive/parallel mode, the first planetary carrier 186 is locked by the first brake 28, and the second sun gear 202 is connected with the first planetary carrier 186 to be locked. When the output power of the engine is excessive, the second motor 16 acts as a The generator is used, and the engine transmits the power to the input element 10, and then transmits it to the third planet carrier 226 and the third ring gear 228, and the third ring gear 228 outputs the power to the output element 12. During this process, the third gear The ring 228 and the third sun gear 222 rotate, the third ring gear 228 drives the second planet carrier 206 to rotate, which in turn drives the second ring gear 208 to rotate, and the third sun gear 222 drives the first ring gear 188 to rotate, thereby driving the first sun gear The wheel 182 rotates, the first sun gear 182 and the first ring gear 188 are coupled to drive the rotor of the second motor 16 to rotate to generate electricity, and the engine independently outputs power in a direct drive manner. When the output power of the engine is insufficient, the second electric motor 16 is used as an electric motor, and the second electric motor 16 transmits the power to the first ring gear 188 through the first sun gear 182 , and then transmits the power to the third sun gear 222 , and passes through the second gear 182 . The ring 208 is transmitted to the second planet carrier 206, and then to the third ring gear 228; the power transmitted to the third sun gear 222 is used as the input of the third planetary gear mechanism 22, and the power transmitted by the engine through the input element 10 is transmitted through the third planetary gear The carrier 226 is used as an input, and the input power is coupled with the power transmitted from the second planet carrier 206 to the third ring gear 228, and is output from the third ring gear 228 to the output element 12. The first motor 14 and the engine are jointly output in parallel power.

10. Fourth engine direct drive/parallel mode

As shown in FIG. 11 , the first brake 28 and the second brake 30 are disengaged, the first clutch 24 and the second clutch 26 are engaged, and the third clutch 32 is disengaged. At this time, the engine is operating, and the first electric motor 14 and the second electric motor are 16 can be used as both a generator and an electric motor, depending on the specific needs of the vehicle and engine operating conditions. When the power provided by the engine is insufficient, additional torque can be provided by two electric motors to achieve parallel drive mode. , to enhance the power of the system. When the engine is running in the economic zone, but the output power is excessive, the two motors can also be used as generators, and the two motors are driven by the engine to generate electricity to charge the battery pack of the car. In this mode, the fixed ratio is 1.

In the fourth engine direct drive/parallel mode, both ends of the first clutch 24 are connected to the first planet carrier 186 and the first sun gear 182 respectively. Two ends of the clutch 26 are respectively connected with the second ring gear 208 and the second sun gear 202 , and the engagement of the second clutch 26 makes the second planetary gear mechanism 20 a rotating whole. When the output power of the engine is excessive, the engine transmits the power to the input element 10, and then transmits it to the third planet carrier 226 and the third ring gear 228, and the third ring gear 228 outputs the power to the output element 12. During this process, The third ring gear 228 and the third sun gear 222 rotate, the third ring gear 228 drives the second planet carrier 206 to rotate, and the third sun gear 222 drives the first ring gear 188 to rotate. The planetary gear mechanism 20 rotates as a whole, so that the first planet carrier 186 connected to the first motor 14 and the first sun gear 182 connected to the second motor 16 are both driven to rotate, so that the rotors of the first motor 14 and the second motor 16 are rotated. Rotating to generate electricity, the engine independently outputs power in a direct-drive manner. When the output power of the engine is insufficient, the first motor 14 and the second motor 16 together drive the first planetary gear mechanism 18 to rotate as a whole, the first motor 14 and the second motor 16 together drive the second planetary gear mechanism 20 to rotate as a whole, the first The ring gear 188 and the second planetary carrier 206 transmit power to the third sun gear 222 and the third ring gear 228 respectively, while the power of the engine is transmitted to the third planetary carrier 226 via the input element 10 as the input of the third planetary gear mechanism 22 In this way, the power is output from the third ring gear 228 to the output element 12 after the third planetary gear mechanism 22 is coupled, and the first motor 14, the second motor 16 and the engine jointly output power in parallel.

11. The first braking energy recovery mode

As shown in FIG. 12 , the first brake 28 is disengaged, the second brake 30 is engaged, the first clutch 24 is engaged, the second clutch 26 and the third clutch 32 are disengaged, at this time, the engine does not work, the first motor 14 and the third clutch 32 are disconnected. The second motor 16 is used as a generator, which is suitable for long-term braking of a high-speed vehicle. This process is the reverse process of the first pure electric mode, and is used to recover the energy of wheel rotation during braking. In this mode, the fixed speed ratio is: 1/(1+K2).

In the first braking energy recovery mode, both ends of the first clutch 24 are connected to the first planet carrier 186 and the first sun gear 182 respectively. The ring 208 is locked due to the engagement of the second brake 30, and the rotation of the output element 12 drives the third ring gear 228 to rotate, which in turn drives the second planet carrier 206 to rotate, and then drives the second sun gear 202 to rotate, thereby driving the first planet gear. The mechanism 18 rotates as a whole to drive the rotors of the first electric motor 14 and the second electric motor 16 to rotate through the first planet carrier 186 and the first sun gear 182 respectively to generate electricity, thereby realizing energy recovery.

12. The second braking energy recovery mode

As shown in FIG. 13 , the first brake 28 is disengaged, the second brake 30 is engaged, the first clutch 24 and the third clutch 32 are disengaged, and the second clutch 26 is engaged. The two electric motors 16 and the engine do not work. This process is the reverse process of the second pure electric mode, which is used to recover the energy of wheel rotation during braking. In this mode, the fixed speed ratio is: 1/(1+K2).

In the second braking energy recovery mode, the second ring gear 208 is locked due to the engagement of the second brake 30, and the first sun gear 182 is connected to the second ring gear 208 to be locked, and the rotation of the output element 12 drives the third gear The ring 228 and the third sun gear 222 rotate, the third ring gear 228 drives the second planet carrier 206 to rotate, which in turn drives the second sun gear 202 to rotate, so as to drive the first planet carrier 186 to rotate, and the third sun gear 222 drives the first gear When the ring 188 rotates, the first ring gear 188 and the first planet carrier 186 are coupled to drive the rotor of the first motor 14 to rotate to generate electricity, thereby realizing energy recovery.

13. The third braking energy recovery mode

As shown in FIG. 14 , the first brake 28 is engaged, the second brake 30 is disengaged, the first clutch 24 and the third clutch 32 are disengaged, and the second clutch 26 is engaged. Two electric motors 16 are used as generators. This process is the reverse process of the third pure electric mode, which is used to recover the energy of wheel rotation during braking. In this mode, the fixed speed ratio is: K2/(K2+1).

In the third braking energy recovery mode, the first planet carrier 186 is locked due to the engagement of the first brake 28 , the second sun gear 202 is connected to the first planet carrier 186 and locked, and the rotation of the output element 12 drives the third ring gear 228 and the third sun gear 222 rotate, the third ring gear 228 drives the second planet carrier 206 to rotate, which in turn drives the second ring gear 208 to rotate, the third sun gear 222 drives the first ring gear 188 to rotate, and then drives the first sun gear 182 rotates, the first sun gear 182 and the second ring gear 208 are coupled to drive the rotor of the second motor 16 to rotate to generate electricity, thereby realizing energy recovery.

14. Fourth braking energy recovery mode

As shown in FIG. 15 , the first brake 28 and the second brake 30 are disengaged, the first clutch 24 and the second clutch 26 are engaged, and the third clutch 32 is disengaged. At this time, the engine does not work, the first motor 14 and the second The motor is used as a generator, regardless of primary or secondary. When one of the motors absorbs the braking energy to generate electricity and still cannot absorb most of the braking energy, the other motor assists in generating electricity, so that the braking energy is not wasted as much as possible. This process is the reverse process of the fourth pure electric mode, which is used to recover the energy of wheel rotation during braking. In this mode, the fixed ratio is 1.

In the fourth braking energy recovery mode, both ends of the first clutch 24 are connected to the first planet carrier 186 and the first sun gear 182 respectively, the engagement of the first clutch 24 makes the first planetary gear mechanism 18 a rotating whole, and the first motor 14 and the second motor 16 together drive the first planetary gear mechanism 18 to rotate as a whole; the rotation of the output element 12 drives the third ring gear 228 to rotate, and drives the first planetary gear mechanism together through the third ring gear 228 and the third sun gear 222 18 and the second planetary gear mechanism 20 rotate integrally, thereby driving the rotors of the first motor 14 and the second motor 16 to rotate to generate electricity, thereby realizing energy recovery.

Each pure electric drive mode and each braking energy recovery mode can correspond to an engine restart mode; specifically, when the power in each pure electric mode is not enough to drive the vehicle or the battery power is low, and the engine must be introduced, The engine restart mode is used; when the long braking process is about to be completed and the engine needs to be restarted, the engine restart mode is also used; in the engine restart mode, if the third clutch 32 is used, the third clutch 32 must be re-engaged, If the third clutch 32 is not provided, the engine only needs to be re-ignited, wherein for the pure electric mode with dual-motor operation or the engine restart mode in the braking energy recovery mode with dual-motor operation, and the pure electric mode or brake energy recovery mode The same principle as the kinetic energy recovery mode, when the power of one motor is not enough to drive the vehicle and start the engine, use another motor to output power, and when the remaining braking energy is not enough to restart the engine, a single motor can be used for energy recovery. When the energy is used for braking energy recovery, if the remaining braking energy is still insufficient to start the engine, the braking energy recovery mode can be turned off, and the engine can be restarted with all the braking energy.

15. Engine restart mode in the first pure electric mode

As shown in FIG. 16 , similar to the first pure electric mode, the difference is that the third clutch 32 needs to be engaged, and the first motor 14 and the second motor 16 drive the input element 10 to rotate through the third planet carrier 226 , thereby restarting the engine.

16. Engine restart mode in the second pure electric mode

As shown in FIG. 17 , similar to the second pure electric mode, the difference is that the third clutch 32 needs to be engaged, and the first motor 14 drives the input element 10 to rotate through the third planet carrier 226 , thereby restarting the engine.

17. Engine restart mode in the third pure electric mode

As shown in FIG. 18 , similar to the third pure electric mode, the difference is that the third clutch 32 needs to be engaged, and the second motor 16 drives the input element 10 to rotate through the third planet carrier 226 , thereby restarting the engine.

18. Engine restart mode in the fourth pure electric mode

As shown in FIG. 19, similar to the fourth pure electric mode, the difference is that the third clutch 32 needs to be engaged, and the first motor 14 and the second motor 16 drive the input element 10 to rotate through the third planet carrier 226, thereby restarting the engine.

19. Engine restart mode in the first braking energy recovery mode

As shown in FIG. 20 , similar to the first braking energy recovery mode, the difference is that the third clutch 32 needs to be engaged, and the output element 12 drives the input element 10 to rotate through the third planet carrier 226 , thereby restarting the engine.

20. Engine restart mode in the second braking energy recovery mode

As shown in FIG. 21 , similar to the second braking energy recovery mode, the difference is that the third clutch 32 needs to be engaged, and the output element 12 drives the input element 10 to rotate through the third planet carrier 226 , thereby restarting the engine.

21. Engine restart mode in the third braking energy recovery mode

As shown in FIG. 22 , it is similar to the third braking energy recovery mode, except that the third clutch 32 needs to be engaged, and the output element 12 drives the input element 10 to rotate through the third planet carrier 226 , thereby restarting the engine.

22. Engine restart mode in the fourth braking energy recovery mode

As shown in FIG. 23 , similar to the fourth braking energy recovery mode, the difference is that the third clutch 32 needs to be engaged, and the output element 12 drives the input element 10 to rotate through the third planet carrier 226 , thereby restarting the engine.

As shown in Table 1 below, it is the operation logic under various operating modes of the power transmission system of the hybrid vehicle. The operation logic in the third clutch 32 is in brackets to indicate that when the power transmission system of the hybrid vehicle has the third clutch 32, it operates according to the corresponding logic; when the power transmission system of the hybrid vehicle does not have the third clutch 32, it operates according to the corresponding logic. The engine can be controlled by logic, but at this time, since the system is directly connected to the engine through the input element 10, in the pure electric mode and the braking energy recovery mode, energy will be lost due to the inertia of the engine.

Table 1 Operation logic table of each mode

The present invention also provides a hybrid vehicle including the above power transmission system.

The power transmission system of the hybrid vehicle of the present invention provides a basic three-planetary-row planetary gear configuration through the reasonable layout of the planetary row mechanical structure, realizes the dual-mode E-CVT working mode, and obtains higher system efficiency; Different combinations of components realize more working modes; thereby further improving the performance of the transmission system and further obtaining higher transmission efficiency, specifically, the power transmission system can achieve:

1. The dual-mode E-CVT working mode makes the engine always run in the economic zone, which greatly improves the economy.

2. Multi-speed pure electric mode, so that the motor always runs in its high-efficiency area in pure electric mode, which further improves the economy.

3. In the engine direct drive mode, there are multiple fixed speed ratio working modes, which further reduces the electric power and improves the system efficiency; and the introduction of the fixed speed ratio can eliminate the stall of the motor, reduce the loss of the motor, and improve the life of the motor.

4. The parallel drive mode of multiple engines and motors, with a parallel drive mode covering low, medium and high speed sections, ensures that the transmission has relatively excellent power performance in each speed section.

5. Multiple braking energy recovery modes; with braking energy recovery modes covering low, medium and high speed sections, to ensure that the braking capacity of each speed section can be fully utilized.

6. Provides multiple engine restart modes, which are convenient for shutting down the engine and restarting the engine at will in each speed segment; improving efficiency and reducing fuel consumption.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, Within the scope of the technical solution of the present invention, when some changes or modifications can be made by using the technical content disclosed above to be equivalent embodiments with equivalent changes, provided that the content of the technical solution of the present invention is not deviated from, the technical essence of the present invention Any simple modifications, equivalent changes and modifications made in the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (8)

1. A power transmission system for a hybrid vehicle, comprising: A first planetary gear mechanism (18) includes a first sun gear (182), a first planetary gear (184), a first planet carrier (186) and a first ring gear (188), the first planetary gear (184) ) is arranged on the first planet carrier (186), and the first planet gear (184) is meshed with the first sun gear (182) and the first ring gear (188) respectively; The second planetary gear mechanism (20) includes a second sun gear (202), a second planetary gear (204), a second planet carrier (206) and a second ring gear (208), the second planetary gear (204) ) is arranged on the second planet carrier (206), and the second planet gear (204) is respectively meshed with the second sun gear (202) and the second ring gear (208); The third planetary gear mechanism (22) includes a third sun gear (222), a third planetary gear (224), a third planetary carrier (226) and a third ring gear (228), the third planetary gear (224) ) is arranged on the third planet carrier (226), and the third planet gear (224) is respectively meshed with the third sun gear (222) and the third ring gear (228); an input element (10), connected with the engine output shaft, and connected with the third planet carrier (226); an output element (12), connected with the third ring gear (228); a first electric motor (14), the first planet carrier (186) is fixedly connected to the rotor of the first electric motor (14); a second electric motor (16), the first sun gear (182) is fixedly connected to the rotor of the second electric motor (16); a first clutch (24); a second clutch (26) connected between the first sun gear (182) and the second ring gear (208); A first brake (28), the other of the first sun gear (182) and the first planet carrier (186) is connected to one end of the first brake (28), the first clutch ( 24) connected between one of the first sun gear (182) and the first planet carrier (186) and one end of the first brake (28); and a second brake (30), one end of the second brake (30) is connected to the second ring gear (208); Wherein, the first planet carrier (186) is also fixedly connected with the second sun gear (202), the first ring gear (188) is fixedly connected with the third sun gear (222), and the first ring gear (188) is fixedly connected with the third sun gear (222). The second planet carrier (206) is fixedly connected with the third ring gear (228). 2. The power transmission system of the hybrid vehicle according to claim 1, characterized in that, the power transmission system of the hybrid vehicle further comprises a third clutch (32), the third clutch (32) being connected to the between the input element (10) and the third planet carrier (226). 3. The power transmission system of the hybrid vehicle according to claim 2, wherein the first clutch (24) is connected to the connection between the first sun gear (182) and the first brake (28) Between one end, the first planet carrier (186) is connected with one end of the first brake (28). 4. The power transmission system of the hybrid vehicle as claimed in claim 3, characterized in that it comprises the following working modes: First E-CVT mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) and the second clutch (26) are disengaged, the The third clutch (32) is engaged, and the engine inputs power through the input element (10); Second E-CVT Mode: Both the first brake (28) and the second brake (30) are disengaged, the first clutch (24) is disengaged, the second clutch (26) and the The third clutch (32) is engaged, and the engine inputs power through the input element (10); First electric-only mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) is engaged, the second clutch (26) and the third The clutch (32) is disconnected; Second pure electric mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) and the third clutch (32) are disengaged, the first The second clutch (26) is engaged; The third pure electric mode: the first brake (28) is engaged, the second brake (30) is disengaged, the first clutch (24) and the third clutch (32) are disengaged, the first The second clutch (26) is engaged; Fourth pure electric mode: the first brake (28) and the second brake (30) are disengaged, the first clutch (24) and the second clutch (26) are engaged, the third clutch (32) Disconnect; First engine direct drive/parallel mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) and the third clutch (32) are engaged, so The second clutch (26) is disconnected, and the engine inputs power through the input element (10); Second engine direct drive/parallel mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) is disengaged, the second clutch (26) and The third clutch (32) is engaged, and the engine inputs power through the input element (10); Third engine direct drive/parallel mode: the first brake (28) is engaged, the second brake (30) is disengaged, the first clutch (24) is disengaged, the second clutch (26) and The third clutch (32) is engaged, and the engine inputs power through the input element (10); Fourth engine direct drive/parallel mode: the first brake (28) and the second brake (30) are disengaged, the first clutch (24) and the second clutch (26) are engaged, the The third clutch (32) is disengaged, and the engine inputs power through the input element (10). 5. The power transmission system of the hybrid vehicle according to claim 4, characterized in that, further comprising the following working modes: Engine restart mode in the first pure electric mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) and the third clutch (32) are engaged , the second clutch (26) is disconnected, and the first motor (14) and the second motor (16) drive the input element (10) to rotate through the third planet carrier (226); Engine restart mode in the second pure electric mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) is disengaged, and the second clutch (26) ) is engaged with the third clutch (32), and the first motor (14) drives the input element (10) to rotate through the third planet carrier (226); Engine restart mode in the third pure electric mode: the first brake (28) is engaged, the second brake (30) is disengaged, the first clutch (24) is disengaged, and the second clutch (26) ) is engaged with the third clutch (32), and the second motor (16) drives the input element (10) to rotate through the third planet carrier (226); Engine restart mode in the fourth pure electric mode: the first brake (28) and the second brake (30) are disconnected, the first clutch (24), the second clutch (26) and all The third clutch (32) is engaged, and the first motor (14) and the second motor (16) drive the input element (10) to rotate through the third planet carrier (226). 6. The power transmission system of the hybrid vehicle according to claim 4, characterized in that, further comprising the following working modes: The first braking energy recovery mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) is engaged, the second clutch (26) and the The third clutch (32) is disconnected, and the output element (12) drives the third ring gear (228) to rotate; Second braking energy recovery mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) and the third clutch (32) are disengaged, so The second clutch (26) is engaged, and the output element (12) drives the third ring gear (228) to rotate; Third braking energy recovery mode: the first brake (28) is engaged, the second brake (30) is disengaged, the first clutch (24) and the third clutch (32) are disengaged, so The second clutch (26) is engaged, and the output element (12) drives the third ring gear (228) to rotate; Fourth braking energy recovery mode: the first brake (28) and the second brake (30) are disengaged, the first clutch (24) and the second clutch (26) are engaged, the first The three clutches (32) are disconnected, and the output element (12) drives the third ring gear (228) to rotate. 7. The power transmission system of a hybrid vehicle as claimed in claim 6, further comprising the following working modes: Engine restart mode in the first braking energy recovery mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) and the third clutch (32) ) is engaged, the second clutch (26) is disconnected, the output element (12) drives the third ring gear (228) to rotate, and drives the input element (228) through the third planet carrier (226). 10) Rotate; Engine restart mode in the second braking energy recovery mode: the first brake (28) is disengaged, the second brake (30) is engaged, the first clutch (24) is disengaged, the second clutch (26) is engaged with the third clutch (32), the output element (12) drives the third ring gear (228) to rotate, and drives the input element (226) through the third planet carrier (226). 10) Rotate; Engine restart mode in the third braking energy recovery mode: the first brake (28) is engaged, the second brake (30) is disengaged, the first clutch (24) is disengaged, the second clutch (26) is engaged with the third clutch (32), the output element (12) drives the third ring gear (228) to rotate, and drives the input element (226) through the third planet carrier (226). 10) Rotate; Engine restart mode in the fourth braking energy recovery mode: the first brake (28) and the second brake (30) are disconnected, the first clutch (24), the second clutch (26) Engaged with the third clutch (32), the output element (12) drives the third ring gear (228) to rotate, and drives the input element (10) to rotate through the third planet carrier (226) . 8. A hybrid vehicle comprising the power transmission system of the hybrid vehicle as claimed in any one of claims 1 to 7.

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