WO2020259518A1

WO2020259518A1 - Battery electric vehicle and electric drive power system therefor

Info

Publication number: WO2020259518A1
Application number: PCT/CN2020/097834
Authority: WO
Inventors: 蒋鹏飞; 张晓伟; 左利锋; 王纪福; 蔡旭东; 张延可; 王建温
Original assignee: 郑州宇通客车股份有限公司
Priority date: 2019-06-27
Filing date: 2020-06-24
Publication date: 2020-12-30
Also published as: CN112140857A

Abstract

Disclosed are a battery electric vehicle and an electric drive power system therefor. The electric drive power system comprises a first electric motor (1), a first gear shift mechanism, a second electric motor (8), a second gear shift mechanism and a system output shaft (11), wherein the first electric motor (1) is connected to the system output shaft (11) via the first gear shift mechanism, and the second electric motor (8) is connected to the system output shaft (11) via the second gear shift mechanism. The range of output rotating speeds and the range of output torques of the electric drive power system are greatly expanded. It can be guaranteed that the first electric motor (1) and the second electric motor (8) are still in an efficient working range when the system is in a high-rotation-speed or high-torque working condition, the working efficiency of the system is improved, the optimal balance between economical efficiency and dynamic performance can be successfully achieved, the problem of the adaptability of the system under all working conditions and road conditions is solved, the power consumption of the whole vehicle is reduced while meeting requirements for the dynamic performance of the whole vehicle, and the operation cost is reduced.

Description

Pure electric vehicle and its electric drive power system

Technical field

The invention relates to a pure electric vehicle and its electric drive power system.

Background technique

With the saturation of pure electric buses in plain areas, the pure electric bus market is expanding to mountainous areas. However, the power system driven by a single motor is limited by the peak torque of the motor, and the climbing performance is difficult to meet the requirements of mountainous conditions. There are both high speed and low speed. Under the road conditions, most of the working conditions of the electric drive system are not in the high-efficiency range, resulting in high power consumption of the vehicle.

The Chinese patent document with the authorization announcement number CN207842637U discloses a pure electric dual-motor single planetary drive system, including a first motor and a second motor. The first motor is directly connected to the system output shaft or through a clutch. The system output shaft, The two motors, the planetary row and the dual clutch mechanism are connected through corresponding connection relationships. The system can be independently driven by a single motor, and can be coupled with dual motor torques, which can not only meet the climbing dynamic requirements at low speeds, but also meet the climbing and acceleration requirements at high speeds. The maximum output torque of the system is: the torque output by the second motor through the deceleration and torque increase of the planetary row plus the torque directly output by the first motor through the clutch, the maximum output speed of the system is: the direct output speed of the second motor plus The speed directly output by the upper first motor. Among them, the first motor cannot achieve variable speed, and only the second motor can achieve variable speed. Therefore, the output speed and output torque range of the system is limited. When high speed or high torque is required, at least one of the motors is required to output a speed or torque outside the normal range, and there is no guarantee that the two motors are in the efficient working range. , Thereby reducing the efficiency of the system. Moreover, the system is limited by the power of the motor, and cannot achieve the best balance between economy and power.

Summary of the invention

The purpose of the present invention is to provide an electric drive power system for a pure electric vehicle to solve the problem of low work efficiency when the pure electric power system is in a high-speed or high-torque working condition. The invention also provides a pure electric vehicle to solve the problem of low working efficiency when the pure electric power system in the pure electric vehicle is in a high-speed or high-torque working condition.

In order to achieve the above objective, the solution of the present invention includes an electric drive power system for a pure electric vehicle, including:

First motor

The second motor; and

System output shaft;

Also includes:

A first shifting mechanism, the first shifting mechanism includes a first power end and a second power end, the first shifting mechanism can realize the switching of at least three gears; and

A second shifting mechanism, the second shifting mechanism includes a third power end and a fourth power end, and the second shifting mechanism can realize the switching of at least three gears;

The first motor is connected to the first power end of the first shifting mechanism, the second motor is connected to the third power end of the second shifting mechanism, and the second power end of the first shifting mechanism The system output shaft is connected to the fourth power end of the second shift mechanism.

The first motor and the second motor are both connected to the output shaft of the system through a shift mechanism. The function of the shift mechanism is to output torques of varying magnitudes when switching to different gears. When the system needs high speed, control the first shift mechanism and the second shift mechanism to be in high speed and low torque gears, then, under the joint action of the first shift mechanism and the second shift mechanism, the system can output High speed; when the system requires high torque, control the first shifting mechanism and the second shifting mechanism to be in low speed and high torque gears, then, under the combined action of the first shifting mechanism and the second shifting mechanism, The system can output high torque. Therefore, the range of output speed and output torque of the system has been greatly expanded. When the system is in high speed or high torque working conditions, it can ensure that the two motors are still in the efficient working range and improve the system. Work efficiency. Moreover, the system can achieve the best balance between economy and power, solve the system's adaptability under all working conditions, and make the motor always work in the high-efficiency zone under the full working conditions of the whole vehicle. ,While meeting the power demand of the vehicle, it reduces the power consumption of the vehicle and lowers the operating cost. In addition, the system can realize single-motor direct drive or dual-motor combined drive, which can realize the following driving conditions: low speed and low torque, low speed and high torque, high speed and low torque, and high speed and high torque. Correspondingly, it can also achieve corresponding Therefore, the system has more operating conditions and can output appropriate speed or torque according to actual needs to ensure that the system runs in the high efficiency range. In addition, due to the use of dual motors, compared to a single-motor system, the volume and weight of a single motor need not be large, which facilitates system layout.

Further, in order to improve the reliability of the system and reduce the complexity of the system structure, for any one of the first shifting mechanism and the second shifting mechanism, it includes a constant meshing gear, a first gear shifting gear, and a second gear shifting mechanism. Gears, first-speed transmission mechanism and second-speed transmission mechanism. The constant meshing gear can selectively mesh with one of the first-speed shift gear and the second-speed shift gear;

For the first shifting mechanism, the first power end is connected to a constant mesh gear, the first-speed shifting gear is connected to the second power end through a first-speed transmission mechanism, and the second-speed shifting gear is connected to the second power end through a second-speed transmission mechanism;

For the second gear shifting mechanism, the third power end is connected to a constant mesh gear, the first gear shifting gear is connected to the fourth power end through a first gear transmission mechanism, and the second gear shifting gear is connected to the fourth power end through a second gear transmission mechanism.

Further, in order to reduce the complexity of the system structure, for the first gear shifting mechanism, the first gear transmission mechanism is the first connecting shaft, and the second gear transmission mechanism is the speed increasing and torque reducing mechanism; for the second gear shifting mechanism, the first gear transmission mechanism is The deceleration and torque increase mechanism and the second gear transmission mechanism are the second connecting shaft.

Further, in order to reduce the complexity of the system structure and improve the reliability of the system, the speed-increasing and torque-reducing mechanism is the first planetary row, the second-speed shift gear is connected to the planet carrier of the first planetary row, and the first planetary row The sun gear is connected to the second power end, and the ring gear of the first planetary row is locked on the corresponding housing; the reduction and torque-increasing mechanism is the second planetary row, and the first gear shifting gear is connected to the second planet Row of sun gear, the planet carrier of the second planet row is connected to the fourth power end, and the ring gear of the second planet row is locked on the corresponding housing.

Further, in order to expand the range of output speed and output torque of the system, the following working conditions are further realized: low speed and low torque, low speed and high torque, high speed and low torque and high speed and high torque, ensuring high speed or high torque output, the first motor It is a low-speed high-torque motor, and the second motor is a high-speed low-torque motor.

The present invention also provides a pure electric vehicle, including the vehicle body and an electric drive power system, the electric drive power system includes:

First motor

The second motor; and

System output shaft;

The electric drive power system further includes:

The first motor and the second motor are both connected to the output shaft of the system through a shift mechanism. The function of the shift mechanism is to output torques of varying magnitudes when switching to different gears. When the car needs high speed, the first gear shifting mechanism and the second gear shifting mechanism are controlled to be in high speed and low torque gears. Then, under the joint action of the first gear shifting mechanism and the second gear shifting mechanism, the car can output High speed; when the car needs high torque, control the first shifting mechanism and the second shifting mechanism to be in the low-speed high-torque gear, then, under the joint action of the first shifting mechanism and the second shifting mechanism, The car can output high torque. Therefore, the range of output speed and output torque of the car has been greatly expanded. When the car is at high speed or high torque, it can ensure that the two motors are still in the efficient working range and improve work. effectiveness. Moreover, the car can achieve the best balance between economy and power, solve the adaptability problem under all working conditions, and make the motor always work in the high-efficiency area under the full working conditions of the whole vehicle. While meeting the power requirements of the vehicle, it reduces the power consumption of the vehicle and reduces operating costs. In addition, the car can realize single-motor direct drive or dual-motor combined drive, which can realize the following driving conditions: low speed and low torque, low speed and high torque, high speed and low torque, and high speed and high torque. Correspondingly, it can also achieve corresponding Therefore, there are many operating conditions, which can output appropriate speed or torque according to actual needs to ensure operation in the high efficiency range. In addition, due to the use of dual motors, compared to a single-motor system, the volume and weight of a single motor need not be large, which facilitates the layout of the electric drive power system.

Further, in order to improve the reliability of the electric drive power system in the automobile and reduce the complexity of the system structure, for any one of the first gear shifting mechanism and the second gear shifting mechanism, it includes a constant meshing gear and a first gear shifting mechanism. Shift gears, second-speed shift gears, first-speed transmission mechanism and second-speed transmission mechanism. The constant meshing gear can selectively mesh with one of the first-speed shift gear and the second-speed shift gear;

Further, in order to reduce the structural complexity of the electric drive power system in the automobile, for the first gear shifting mechanism, the first gear transmission mechanism is the first connecting shaft, and the second gear transmission mechanism is the speed increasing and reducing torque mechanism; for the second gear shifting mechanism, In the mechanism, the first gear transmission mechanism is a deceleration and torque increase mechanism, and the second gear transmission mechanism is the second connecting shaft.

Further, in order to reduce the structural complexity of the electric drive power system in the automobile and improve the system reliability, the speed increasing and torque reducing mechanism is the first planetary row, and the second gear shifting gear is connected to the planet carrier of the first planetary row , The sun gear of the first planetary row is connected to the second power end, and the ring gear of the first planetary row is locked on the corresponding housing; the deceleration and torque-increasing mechanism is the second planetary row, one-gear shift The gear is connected to the sun gear of the second planetary row, the planet carrier of the second planetary row is connected to the fourth power end, and the ring gear of the second planetary row is locked on the corresponding housing.

Further, in order to expand the range of output speed and output torque of the automobile, the following working conditions are further realized: low speed and low torque, low speed and high torque, high speed and low torque and high speed and high torque, ensuring high speed or high torque output, the first motor It is a low-speed high-torque motor, and the second motor is a high-speed low-torque motor.

Description of the drawings

Figure 1 is a structural diagram of the electric drive power system of a pure electric vehicle provided by the present invention;

Figure 2 is a power transmission diagram of the electric drive power system of the pure electric vehicle provided by the present invention under low-speed and low-torque driving conditions;

Figure 3 is a power transmission diagram of the electric drive power system of the pure electric vehicle provided by the present invention under low-speed and high-torque driving conditions;

4 is a power transmission diagram of the electric drive power system of the pure electric vehicle provided by the present invention under high-speed and low-torque driving conditions;

FIG. 5 is a power transmission diagram of the electric drive power system of the pure electric vehicle provided by the present invention under high-speed and high-torque driving conditions;

Figure 6 is a power transmission diagram of the electric drive power system of the pure electric vehicle provided by the present invention under low-speed and low-torque braking conditions;

FIG. 7 is a power transmission diagram of the electric drive power system of the pure electric vehicle provided by the present invention under low-speed and high-torque braking conditions;

8 is a power transmission diagram of the electric drive power system of the pure electric vehicle provided by the present invention under high-speed and low-torque braking conditions;

9 is a power transmission diagram of the electric drive power system of a pure electric vehicle provided by the present invention under high-speed and high-torque braking conditions;

In the figure, 1 is the first motor, 2 is the first planet carrier, 3 is the first ring gear, 4 is the first sun gear, 5 is the second planet carrier, 6 is the second ring gear, and 7 is the second sun gear , 8 is the second motor, 9 is the second two-way clutch, 10 is the first two-way clutch, 11 is the system output shaft, 12 is the main reducer, and 13 is the wheel.

Detailed ways

Examples of pure electric vehicles:

This embodiment provides a pure electric vehicle, including a car body and an electric drive power system. The car body includes a body, a power battery and other components. Since the car body is a conventional technology and is not the focus of protection, this embodiment will not Specific instructions. Therefore, the pure electric vehicle provided in this embodiment is a pure electric vehicle including the following electric drive power system.

The electric drive power system includes a first motor 1, a second motor 8, a system output shaft 11, a first shift mechanism and a second shift mechanism. Both the first gear shifting mechanism and the second gear shifting mechanism can realize the switching of at least three gears, which can include only three gears, or more gears (such as fourth gear or fifth gear). In different gears, different torques are output. Among them, at least three gears can include neutral gear, that is, at least three gears realized by the first gear shifting mechanism are: neutral gear and at least two other non-neutral gears, and at least three gears realized by the second gear shifting mechanism The two gears are: neutral gear and at least two other gears that are not neutral.

In this embodiment, both the first gear shifting mechanism and the second gear shifting mechanism take the second gear shifting mechanism as an example. Then, the realized gears are: first gear, second gear, and neutral gear. In terms of the entire first shifting mechanism, it includes two power ends, namely the first power end and the second power end. The power is input from the first power end and then output from the second power end, or the power is from the second power end. The power end is input and then output from the first power end; similarly, in terms of the entire second shifting mechanism, including the third power end and the fourth power end, the power is input from the third power end and then from the fourth power end Output, or power is input from the fourth power end, and then output from the third power end.

For any one of the first gear shifting mechanism and the second gear shifting mechanism, it includes a constant mesh gear, a first gear shifting gear, a second gear shifting gear, a first gear transmission mechanism, and a second gear transmission mechanism. Among them, for the same shifting mechanism, the torque output by the first-speed transmission mechanism is greater than the torque output by the second-speed transmission mechanism. For the first gear shifting mechanism, the first gear transmission mechanism is the first connecting shaft, and the second gear transmission mechanism is the speed-increasing and torque-reducing mechanism. The connecting shaft means that the power is directly output through a transmission shaft without reducing or increasing torque. , Then, the torque output directly is greater than the torque output after the torque reduction effect of the speed increase and torque reduction mechanism. For the second gear shifting mechanism, the first gear transmission mechanism is a deceleration and torque increase mechanism, and the second gear transmission mechanism is a second connecting shaft. Similarly, the connecting shaft means that the power is not reduced or increased, but directly passes through a transmission shaft. For output, the torque output after the torque increase by the deceleration and torque increase mechanism is greater than the torque directly output.

The first motor 1 is connected to the first power end of the first shift mechanism, the second motor 8 is connected to the third power end of the second shift mechanism, the second power end of the first shift mechanism and the second power end of the second shift mechanism The four power ends are connected to the output shaft 11 of the system. Moreover, the first power end is connected to the constant meshing gear of the first shifting mechanism, the first gear shifting gear of the first shifting mechanism is connected to the second power end through the first connecting shaft, and the second gear shifting gear of the first shifting mechanism The second power end is connected by the speed-increasing and torque-reducing mechanism, the constant meshing gear of the first shifting mechanism can selectively mesh with one of the first-speed shifting gear and the second-speed shifting gear to realize gear shifting. Of course, the constant meshing The gear may also not mesh with the first-speed shift gear or the second-speed shift gear, that is, the first shift mechanism is in a neutral state. The third power end is connected to the constant meshing gear of the second shifting mechanism, the first-speed shifting gear is connected to the fourth power end through the deceleration and torque-increasing mechanism, the second-speed shifting gear is connected to the fourth power end through the second connecting shaft, and the second shifting gear The constant mesh gear of the gear mechanism can selectively mesh with one of the first gear shift gear and the second gear shift gear to achieve shifting. Of course, the constant mesh gear may not be shifted with the first gear shift gear or the second gear shift gear. Gear meshing, that is, the second gear shifting mechanism is in a neutral state. Since the first power end is connected to the normally meshed gear of the first shift mechanism, the normally meshed gear of the first shift mechanism can be regarded as the first power end. Since the third power end is connected to the constant mesh gear of the second shift mechanism, the constant mesh gear of the second shift mechanism can be regarded as the third power end. Further, the speed increasing and torque reducing mechanism and the decelerating torque increasing mechanism are both planetary rows, and the torque reduction or torque increase is realized through different connection relationships. Specifically, the speed increasing and torque reducing mechanism is the first planetary row, and the decelerating torque increasing mechanism is the first planetary row. Two planetary rows.

Therefore, Figure 1 shows a specific structure of the electric drive power system. The constant meshing gear of the first gear shifting mechanism, the first gear shifting gear, and the second gear shifting gear constitute the first two-way clutch 10, and the constant meshing gear of the second gear shifting mechanism, the first gear shifting gear and the second gear shifting gear constitute The second two-way clutch 9. The first planetary row includes a first planet carrier 2, a first ring gear 3 and a first sun gear 4, and the second planetary row includes a second planet carrier 5, a second ring gear 6 and a second sun gear 7. The second gear shifting gear of the first two-way clutch 10 is connected to the first planet carrier 2, the first sun gear 4 is connected to the second power end, that is, to the system output shaft 11, and the first ring gear 3 is locked on the corresponding housing ( Such as planetary row housing or body housing, the same below). The first gear shifting gear of the second two-way clutch 9 is connected to the second sun gear 7, the second planet carrier 5 is connected to the fourth power end, that is, to the output shaft 11 of the system, and the second ring gear 6 is locked on the corresponding housing. The system output shaft 11 is connected to the wheels 13 through the final drive 12. In addition, the power battery is connected to the first motor 1 and the second motor 8 through a corresponding motor controller.

In order to further meet the needs of high speed and high torque, the first motor 1 is a low speed and high torque motor, that is, a low rated speed and high rated torque motor. The high efficiency area of the first motor 1 corresponds to low speed; the second motor 8 is high speed A low-torque motor is a motor with a high rated speed and a low rated torque. The high efficiency area of the second motor 8 corresponds to a high speed. Of course, the first motor 1 and the second motor 8 may also be other types of motors, for example, they are the same motor.

When the electric drive power system is in the driving mode, the power battery supplies power to the first motor 1 and/or the second motor 8 through the motor controller; when the electric drive power system is in the braking mode, the first motor 1 and/or the second motor 8 The motor 8 is reversely driven to generate electricity and charges the power battery through the motor controller. The power transmission of the electric drive power system in each working mode is described as follows:

(1) Working mode 1: Low speed and low torque drive mode:

When the vehicle is in the low-speed and low-torque driving mode, the second two-way clutch 9 is disengaged, that is, its constant meshing gear does not mesh with the first gear shift gear or the second gear shift gear, and the second motor 8 is disconnected from the system output shaft 11. Output power; in the first two-way clutch 10, its constant meshing gear meshes with the first-speed shift gear, the first motor 1 and the system output shaft 11 are directly connected, and the power of the first motor 1 directly drives the wheels 13 through the first transmission shaft . In this working mode, only the first motor 1 drives the wheels 13 and the second motor 8 does not output. The first motor 1 can be in the economic speed range. While meeting the power requirements of the whole vehicle, it obtains the optimal economic efficiency. The transfer route is shown in Figure 2.

(2) Working mode 2: Low speed and high torque drive mode:

When the vehicle is in the low-speed and high-torque driving mode, in the first two-way clutch 10, its constant meshing gear meshes with the first-speed shift gear, which directly connects the first motor 1 and the system output shaft 11, and the power of the first motor 1 passes through the A drive shaft directly drives the wheels 13 to travel; in the second two-way clutch 9, its constant meshing gear meshes with the first gear shifting gear, the second motor 8 is combined with the second sun gear 7, and the second motor 8 is powered by the second sun The wheel 7 passes through the second planet carrier 5 for output, and the second planetary row achieves deceleration and torque increase. After the torque increases, it is output to the system output shaft 11. In this working mode, the first motor 1 and the second motor 8 work together to drive the wheels 13. While meeting the power requirements of the entire vehicle, both the first motor 1 and the second motor 8 work in the high-efficiency range to obtain optimal economy , The power transmission route is shown in Figure 3.

(3) Working mode 3: High speed and low torque drive mode:

When the vehicle is in the high-speed and low-torque driving mode, the first two-way clutch 10 is disengaged, that is, its constant meshing gear does not mesh with the first gear shift gear or the second gear shift gear, and the first motor 1 is disconnected from the system output shaft 11. Output power; in the second two-way clutch 9, its constant meshing gear meshes with the second gear shifting gear, the second motor 8 is directly connected to the system output shaft 11, and the power of the second motor 8 directly drives the wheels 13 through the second drive shaft . In this working mode, the second motor 8 alone drives the wheels 13 and the second motor 8 is in the economical speed range. While meeting the power requirements of the entire vehicle, the optimal economy is obtained. The power transmission route is shown in FIG. 4.

(4) Working mode 4: High speed and high torque drive mode:

When the vehicle is driven under high-speed and high-torque driving conditions, in the first two-way clutch 10, its constant meshing gear meshes with the second-gear shift gear, the first motor 1 is combined with the first planet carrier 2, and the power of the first motor 1 is A planet carrier 2 is output through the first sun gear 4, and the first planetary row realizes speed increase and torque reduction, and the torque is output to the system output shaft 11 after the torque is reduced; in the second two-way clutch 9, its constant meshing gear shifts with the second gear Gears mesh, the second motor 8 is directly connected to the system output shaft 11, and the power of the second motor 8 directly drives the wheels 13 to travel through the second drive shaft. In this working mode, the first motor 1 and the second motor 8 work together to drive the wheels 13. While meeting the power requirements of the entire vehicle, both the first motor 1 and the second motor 8 work in the high-efficiency range to obtain optimal economy , The power transmission route is shown in Figure 5.

(5) Working mode five: low speed and low torque braking mode:

When the vehicle is in the low-speed and low-torque braking mode, corresponding to the above-mentioned working mode 1, the second two-way clutch 9 is disengaged, that is, its constant meshing gear does not mesh with the first gear shift gear or the second gear shift gear, and the second motor 8 Disconnected from the system output shaft 11; in the first two-way clutch 10, its constant meshing gear meshes with the first-gear shift gear, the first motor 1 and the system output shaft 11 are directly connected, and the power is from the wheels 13, the system output shaft 11 and the first A two-way clutch 10 is output to the first motor 1 and drives the first motor 1 to generate electricity. In this working mode, only the first motor 1 is reversely driven to generate power, the second motor 8 is stationary, and the first motor 1 is in the economic speed range. While meeting the braking performance requirements of the whole vehicle, it obtains the optimal power generation efficiency and its power transmission The route is shown in Figure 6.

(6) Working mode 6: Low speed and high torque braking mode:

When the vehicle is in the low-speed and high-torque braking mode, it corresponds to the above-mentioned working mode 2. In the first two-way clutch 10, its constant meshing gear meshes with the first-speed shift gear, and directly connects the first motor 1 and the system output shaft 11 , The power is output from the wheels 13, the system output shaft 11 and the first two-way clutch 10 to the first motor 1, which drives the first motor 1 to generate electricity; in the second two-way clutch 9, its constant meshing gear meshes with the first gear shifting gear, The second motor 8 is combined with the second sun gear 7, and the power from the output shaft 11 of the system is passed through the second two-way clutch 9 through the second planetary row to drive the second motor 8 to generate electricity. In this working mode, the first motor 1 and the second motor 8 are both reversed to generate electricity, and the first motor 1 and the second motor 8 are in their respective high-efficiency power generation intervals. While meeting the braking performance requirements of the entire vehicle, the The optimal power generation efficiency and its power transmission route are shown in Figure 7.

(7) Working mode 7: High speed and low torque braking mode:

When the vehicle is in the high-speed and low-torque braking mode, corresponding to the above-mentioned working mode 3, the first two-way clutch 10 is disengaged, that is, its constant meshing gear does not mesh with the first gear shift gear or the second gear shift gear, and the first motor 1 Disconnected from the system output shaft 11; in the second two-way clutch 9, its constant meshing gear meshes with the second gear shifting gear, the second motor 8 is directly connected to the system output shaft 11, and the power is from the wheels 13, the system output shaft 11 and the first After the two-way clutch 9 drives the second motor 8 to generate electricity. In this working mode, only the second motor 8 is reversely driven to generate power, and the second motor 8 is in the economic speed range. While meeting the braking performance requirements of the entire vehicle, the optimal power generation efficiency is obtained. The power transmission route is shown in Figure 8. .

(8) Working mode eight: high-speed and high-torque braking mode:

When the vehicle is in the high-speed and high-torque braking mode, it corresponds to the above working mode 4. In the first two-way clutch 10, its constant meshing gear meshes with the second gear shifting gear, and the first motor 1 is combined with the first planet carrier 2. After the power from the wheels 13, the system output shaft 11 and the first two-way clutch 10, the first motor 1 is driven to generate electricity through the deceleration and torque-increasing effect of the first planetary row; in the second two-way clutch 9, its constant meshing gear is shifted with the second gear When the gears are engaged, the second motor 8 is directly connected to the system output shaft 11, and the power is driven from the wheels 13, the system output shaft 11 and the second two-way clutch 9 to the second motor 8 to generate electricity. In this working mode, the first motor 1 and the second motor 8 are both reversed to generate electricity, and the first motor 1 and the second motor 8 are in their respective high-efficiency power generation intervals. While meeting the braking performance requirements of the entire vehicle, the The optimal power generation efficiency and its power transmission route are shown in Figure 9.

Table 1 shows the states and functions of the first motor 1, the second motor 8, the first planetary row and the second planetary row in each working mode.

Table 1

Therefore, the electric drive power system adopts a dual-motor system composed of a low-rated speed, high-rated torque motor and a high-rated speed, low-rated torque motor. The dual motor can be directly connected to the system output shaft 11 to drive the vehicle, and it can also be driven by planetary gear After the shifting effect, the vehicle is driven. The two motors are respectively connected to the planetary row through a two-way clutch. When the motor is driven by the planetary row gear, the planetary row connected to the low-rated speed and high-rated torque motor acts to increase speed and reduce torque to meet the requirements of the vehicle at high speeds. The function of the planetary row connected to the motor with high rated speed and low rated torque is to decelerate and increase torque to meet the power requirements of the whole vehicle at low speed. Correspondingly, when the motor is braked by the planetary gear shifting, the planetary gear connected to the low-rated speed and high-rated torque motor is used to decelerate and increase torque, and achieve the highest power generation efficiency while meeting the braking requirements of the vehicle. The function of the planetary row connected to the low-speed rated torque motor is to increase the speed and reduce the torque, and achieve the highest power generation efficiency while meeting the braking requirements of the whole vehicle. The electric drive power system can meet performance requirements in the above eight working modes, and obtain optimal economy. In addition, the electric drive power system can also avoid power interruption in the process of working mode switching, thereby improving the driving comfort of the vehicle. Moreover, the electric drive power system is small in size, convenient to arrange, lower in cost, and lighter in weight.

In the above-mentioned embodiment, the speed increasing and reducing torque mechanism and the decelerating and increasing torque mechanism are both planetary rows, and the torque reduction or the increase of torque can be realized through different connection relationships. Of course, as other embodiments, the speed increasing and reducing torque mechanism may also be other existing Some mechanisms that realize the function of speed increasing and torque reduction, the deceleration and torque increase mechanism may also be other existing mechanisms that realize the function of speed reduction and torque increase.

In the above embodiment, for the first gear shifting mechanism, the first gear transmission mechanism is the first connecting shaft, and the second gear transmission mechanism is the speed-increasing and torque-reducing mechanism. The directly output torque is higher than the torque-reducing effect of the speed-increasing and torque-reducing mechanism. The rear output torque is large. Of course, as long as the torque output by the first-speed transmission mechanism is greater than the torque output by the second-speed transmission mechanism, the first-speed transmission mechanism and the second-speed transmission mechanism may also be other existing related mechanisms. In the same way, for the second gear shifting mechanism, the first gear transmission mechanism is a deceleration and torque increase mechanism, and the second gear transmission mechanism is the second connecting shaft. After the torque increase of the deceleration and torque increase mechanism, the output torque is higher than the direct output torque. Of course, as long as the torque output by the first-speed transmission mechanism is greater than the torque output by the second-speed transmission mechanism, the first-speed transmission mechanism and the second-speed transmission mechanism may also be other existing related mechanisms. For example: other first implementations: in the first gear shifting mechanism and the second gear shifting mechanism, the first gear transmission mechanism is the connecting shaft, and the second gear transmission mechanism is the speed increasing and torque reducing mechanism; the other second implementations Mode: In the first gear shifting mechanism and the second gear shifting mechanism, the first gear transmission mechanism is a deceleration and torque increase mechanism, and the second gear transmission mechanism is a connecting shaft; the other third embodiments: the first gear shifting mechanism and the second gear In the second gear shifting mechanism, the first gear transmission mechanism is a speed increasing and torque increasing mechanism, and the second gear transmission mechanism is a speed increasing and reducing torque mechanism.

The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the present invention, designing various deformed models, formulas, and parameters does not require creative work. Changes, modifications, replacements and modifications made to the embodiments without departing from the principle and spirit of the present invention still fall within the protection scope of the present invention.

Examples of electric drive power system:

This embodiment provides an electric drive power system, which has been described in detail in the above-mentioned pure electric vehicle embodiment, and will not be repeated in this embodiment.

Claims

An electric drive power system for a pure electric vehicle, including:

First motor

The second motor; and

System output shaft;

It is characterized in that it also includes:

A first shifting mechanism, the first shifting mechanism includes a first power end and a second power end, the first shifting mechanism can realize the switching of at least three gears; and

A second shifting mechanism, the second shifting mechanism includes a third power end and a fourth power end, and the second shifting mechanism can realize the switching of at least three gears;

The first motor is connected to the first power end of the first shifting mechanism, the second motor is connected to the third power end of the second shifting mechanism, and the second power end of the first shifting mechanism The system output shaft is connected to the fourth power end of the second shift mechanism.
The electric drive power system of a pure electric vehicle according to claim 1, wherein:

In the first shifting mechanism, the first power end is connected to the constant meshing gear of the first shifting mechanism, and the first gear shifting gear of the first shifting mechanism is connected to the second power end through the first gear transmission mechanism of the first shifting mechanism, The second gear shift gear of the first gear shift mechanism is connected to the second power end through the second gear transmission mechanism of the first gear shift mechanism; the constant mesh gear of the first gear shift mechanism can be connected with the first gear shift gear of the first gear shift mechanism Selectively mesh with one of the second gear shift gears;

In the second shifting mechanism, the third power end is connected to the constant meshing gear of the second shifting mechanism, and the first-speed shifting gear of the second shifting mechanism is connected to the fourth power end through the first-speed transmission mechanism of the second shifting mechanism, The second gear shift gear of the second gear shift mechanism is connected to the fourth power end through the second gear transmission mechanism of the second gear shift mechanism; the constant mesh gear of the second gear shift mechanism can be connected with the first gear shift gear of the second gear shift mechanism It selectively meshes with one of the second gear shift gears.
The electric drive power system of a pure electric vehicle according to claim 2, wherein the first gear transmission mechanism of the first gear shift mechanism is the first connecting shaft, and the second gear transmission mechanism of the first gear shift mechanism is speed increasing and decreasing Torsion mechanism; the first gear transmission mechanism of the second gear shift mechanism is a deceleration and torque increase mechanism, and the second gear transmission mechanism of the second gear shift mechanism is the second connecting shaft.
The electric drive power system of a pure electric vehicle according to claim 3, wherein the speed increasing and torque reducing mechanism is a first planetary row, and the second gear shifting gear of the first shifting mechanism is connected to the first planetary row. The sun gear of the first planetary row is connected to the second power end, and the ring gear of the first planetary row is locked on the corresponding housing; the deceleration and torque-increasing mechanism is the second planetary row, The first-speed shift gear of the second shift mechanism is connected to the sun gear of the second planetary row, the planet carrier of the second planetary row is connected to the fourth power end, and the ring gear of the second planetary row is locked at the corresponding On the shell.
The electric drive power system for a pure electric vehicle according to claim 3 or 4, wherein the first motor is a low-speed high-torque motor, and the second motor is a high-speed low-torque motor.
A pure electric vehicle includes a vehicle body and an electric drive power system. The electric drive power system includes:

First motor

The second motor; and

System output shaft;

It is characterized in that the electric drive power system further includes:

A first shifting mechanism, the first shifting mechanism includes a first power end and a second power end, the first shifting mechanism can realize the switching of at least three gears; and

A second shifting mechanism, the second shifting mechanism includes a third power end and a fourth power end, and the second shifting mechanism can realize the switching of at least three gears;

The first motor is connected to the first power end of the first shifting mechanism, the second motor is connected to the third power end of the second shifting mechanism, and the second power end of the first shifting mechanism The system output shaft is connected to the fourth power end of the second shift mechanism.
The pure electric vehicle according to claim 6, characterized in that:

In the first shifting mechanism, the first power end is connected to the constant meshing gear of the first shifting mechanism, and the first gear shifting gear of the first shifting mechanism is connected to the second power end through the first gear transmission mechanism of the first shifting mechanism, The second gear shift gear of the first gear shift mechanism is connected to the second power end through the second gear transmission mechanism of the first gear shift mechanism; the constant mesh gear of the first gear shift mechanism can be connected with the first gear shift gear of the first gear shift mechanism Selectively mesh with one of the second gear shift gears;

In the second shifting mechanism, the third power end is connected to the constant meshing gear of the second shifting mechanism, and the first-speed shifting gear of the second shifting mechanism is connected to the fourth power end through the first-speed transmission mechanism of the second shifting mechanism, The second gear shift gear of the second gear shift mechanism is connected to the fourth power end through the second gear transmission mechanism of the second gear shift mechanism; the constant mesh gear of the second gear shift mechanism can be connected with the first gear shift gear of the second gear shift mechanism It selectively meshes with one of the second gear shift gears.
The pure electric vehicle according to claim 7, wherein the first gear transmission mechanism of the first gear shift mechanism is the first connecting shaft, and the second gear transmission mechanism of the first gear shift mechanism is a speed increasing and torque reducing mechanism; The first gear transmission mechanism of the gear shift mechanism is a deceleration and torque increase mechanism, and the second gear transmission mechanism of the second gear shift mechanism is the second connecting shaft.
The pure electric vehicle according to claim 8, wherein the speed increasing and torque reducing mechanism is a first planetary row, and the second gear shifting gear of the first shifting mechanism is connected to the planet carrier of the first planetary row, The sun gear of the first planetary row is connected to the second power end, and the ring gear of the first planetary row is locked on the corresponding housing; the deceleration and torque-increasing mechanism is the second planetary row, and the second shift mechanism The first-speed shift gear of the second planetary row is connected to the sun gear of the second planetary row, the planet carrier of the second planetary row is connected to the fourth power end, and the ring gear of the second planetary row is locked on the corresponding housing.
The pure electric vehicle according to claim 8 or 9, wherein the first motor is a low-speed high-torque motor, and the second motor is a high-speed low-torque motor.