WO2010133155A1

WO2010133155A1 - Driving system for electric vehicle

Info

Publication number: WO2010133155A1
Application number: PCT/CN2010/072835
Authority: WO
Inventors: 张永
Original assignee: 芜湖普威技研有限公司
Priority date: 2009-05-18
Filing date: 2010-05-17
Publication date: 2010-11-25
Also published as: CN101549632A

Abstract

A driving system for an electric vehicle is provided, including a speed-changing and differential mechanism (30), a first driving motor (10), a second driving motor (11), a motor controller (60) and an electric power resource (20). The first driving motor (10) and the second driving motor (11) are disposed on both sides of the speed-changing and differential mechanism (30) respectively. A power battery can be used as the electric power resource (20), and supplies electricity for the first driving motor (10) and the second driving motor (11). Said motor controller (60) monitors and controls the working state of the first driving motor (10) and the second driving motor (11). The first driving motor (10) and the second driving motor (11) input power to the speed-changing and differential mechanism (30), which inputs power to a first driving axle shaft (40) and a second driving axle shaft (41) so as to force wheels (50)to run. The invention satisfies the power requirement of the electric vehicle, and meanwhile solves the problem of difficult suspension design due to the bad distance between a longitudinal beam and the motor or the speed-changing mechanism by effectively utilizing the layout space of a front compartment. The design of a propeller shaft is relatively simple, thereby enabling the bilaterally symmetric design of the propeller shaft, solving the problem of unbalanced mass distribution of the front compartment, and obtaining a simple and compact structure.

Description

Electric vehicle drive system

Technical field

The invention relates to an electric vehicle drive system. Background technique

With the development of the global economy, oil consumption is increasing, and oil as a non-renewable resource is becoming increasingly scarce. The heavy use of oil has caused serious environmental pollution, so electric vehicles have become more and more important as an alternative means of transportation for fuel vehicles. In the design of existing electric vehicles, most of them are driven by hub motors. The controller controls the motor as the power source of the whole vehicle. However, there are many problems in this control method and mechanical connection, such as: Two (or more than two) motor synchronization The control is difficult, and the electronic differential control of the vehicle during the turning process is difficult to achieve the desired effect, and the design of the motor cooling system is difficult. In addition, some electric vehicle drive systems use a high-power drive motor (AC motor or DC motor) to connect with the variable speed mechanism and the differential mechanism, and then connect the drive half-shaft drive vehicle. However, this connection method has low utilization rate of the front storage space, difficulty in suspension design caused by poor distance between the motor and the shifting mechanism from the longitudinal beam, difficulty in designing the transmission half shaft, and serious imbalance in the quality distribution of the front storage.

In summary, the following technical problems exist in the prior art:

(1) Multiple motors are difficult to control synchronously, suspension design is difficult, and the shifting and differential mechanisms are inconveniently arranged; (2) The utilization and mass distribution of the front bin space is difficult to be reasonable. Summary of the invention

The technical problem to be solved by the present invention is to provide an electric vehicle driving system for the deficiencies of the prior art, wherein the motor of the system is symmetrically arranged left and right, and the shifting and differential mechanisms are placed in the middle.

While satisfying the power demand of electric vehicles, the front storage space is effectively utilized to solve the problem of suspension design difficulties caused by the poor distance between the motor and the shifting mechanism from the longitudinal beam. The design of the transmission shaft is relatively simple, so that the left and right symmetric transmission shaft design It became possible, and solved the problem of serious imbalance in the quality distribution of the former warehouse.

The technical problem to be solved by the present invention is achieved by the following technical solutions:

An electric vehicle drive system includes a shifting and differential mechanism, a drive motor disposed on both sides of the shifting and differential mechanism, a motor controller, and a power source. The power source can be a power battery pack, the power battery pack The driving motor is powered, the motor controller monitors and controls the working state of the driving motor, drives the motor to input power to the shifting and differential mechanisms, and the shifting and differential mechanism inputs power to the driving half shaft to drive the wheels.

Specifically, the technical solution of the present invention is as follows:

An electric vehicle driving system includes a first driving motor, a second driving motor, and a shifting and differential mechanism, a shifting and differential mechanism, wherein the first driving motor and the second driving motor are distributed in two of the shifting and differential mechanisms On the side, the power is input to the shifting and differential mechanisms.

The first drive motor and the second drive motor are coaxially disposed.

The first drive motor and the second drive motor are the same or different drive motors.

The rotor shaft of the first drive motor, the input shaft of the shifting and differential mechanism and the rotor shaft of the second drive motor are coaxial; or the first drive motor is coaxial with the input shaft of the shifting and differential mechanism, and the second drive The motor is connected by a spline/coupling;

Alternatively, the first drive motor and the second drive motor are respectively coupled to the input shaft of the deceleration and differential mechanism.

The electric vehicle drive system further includes a control system that controls the first drive motor and the second drive motor, respectively.

The control system includes a motor controller that controls the first drive motor and the second drive motor, and the two drive motors can simultaneously adopt a speed control mode or a torque control mode, or both adopt a speed control mode and a torque control mode .

The motor controller includes a first control module and a second control module, the first control module controls the second drive motor, and the second control module controls the first drive motor.

The control system further includes a vehicle controller, and the vehicle controller is connected to the first control module and the second control module via a CAN communication bus.

The first control module and the second control module exchange information through the CAN communication bus.

The electric vehicle drive system further includes a power source that supplies power to the first drive motor and the second drive motor.

The first driving motor and the second driving motor output power to the input shaft of the shifting and differential mechanism, and the shifting and differential mechanisms output the power to the first driving half shaft and the second driving half shaft through the shifting variable torque, and drive The wheels are running.

Compared with the prior art, the invention adopts a coaxial drive motor to increase the axial dimension of the electric power assembly, thereby effectively solving the problem of utilizing the space of the front bin. The front drive drive system and the speed reduction mechanism are conveniently arranged, solving the difficulty of the suspension design, making the symmetrical design of the drive shaft possible; solving the serious imbalance of the front bin mass distribution Question.

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. DRAWINGS

1 is a schematic structural view of an electric vehicle driving system of the present invention.

In Figure 1: 10 first drive motor, 11 second drive motor, 20 power supply, 30 shifting, differential mechanism, 40 first drive half shaft, 41 second drive half shaft, 50 wheels, 60 motor controller, 70 First control module, 80 second control module, 90, 110 CAN communication bus, 100 vehicle controller. detailed description

The invention is described in detail below with reference to the drawings, which are a preferred embodiment of various embodiments of the invention.

As shown in FIG. 1 , the present invention provides an electric vehicle drive system, which mainly includes: a first drive motor 10 and a second drive motor 11 , which may be the same or different, power source 20, shifting, differential Agency 30. The power source 20 supplies power to the first drive motor 10 and the second drive motor 11, and the first drive motor 10 and the second drive motor 11 input power to the shifting and differential mechanism 30. The first drive motor 10, the shifting, differential mechanism 30, and the second drive motor 11 are sequentially connected.

In the embodiment shown in Fig. 1, the first drive motor 10 and the second drive motor 11 are distributed on both sides of the shifting and differential mechanism 30. There are many ways to connect the three. The first type: The first drive motor 10 rotor shaft, the shifting, differential mechanism 30 input shaft and the rotor shaft of the second drive motor 11 can be used, and the three are coaxially connected. Second: The first drive motor 10 is coaxial with the shifting and differential mechanism 30 input shaft, and is connected to the second drive motor 11 by a spline (or a conventional structure such as a coupling). The third type: The first drive motor 10, the second drive motor 11 is respectively connected to the input shaft of the shifting and differential mechanism 30, and then directly or indirectly connected together.

The first drive motor 10 and the second drive motor 11 collectively input power to the shifting and differential mechanism 30, and the shifting and differential mechanism 30 outputs power to the first drive half shaft 40 and the second drive half shaft 41 through its output shaft. The first drive half shaft 40 and the second drive half shaft 41 drive the wheels 50 to move.

As a control portion of the above electric vehicle drive system, the electric vehicle drive system may further include a motor controller 60 and a vehicle controller 100. The motor controller 60 therein further includes a first control module 70 and a second control module 80. The drive system controls the first drive motor 10 and the second drive motor 11 through the first control module 70 and the second control module 80, respectively. Vehicle controller 100 communicates via CAN (automotive LAN) The line 90 communicates with the first control module 70, the second control module 80, transmits various commands and accepts information sent by the first control module 70 and the second control module 80, and the first control module 70 and the second control module 80 also Information can be exchanged via the CAN communication bus.

When the vehicle is running, the first control module 70 and the second control module 80 of the motor controller 60 send control commands to the first drive motor 10 and the second drive motor 11, respectively, and the first drive motor 10 and the second drive motor 11 The opposite direction of rotation (from the rear end of the drive motor to the drive motor power output), the control mode of the first drive motor 10 and the second drive motor 11 can be in the speed control mode or the torque control mode, or a drive motor In the speed control mode, the other drive motor uses the torque control mode. The first drive motor 10 and the second drive motor 11 output power to the input shaft of the shifting and differential mechanism 30, and the shifting and differential mechanism 30 outputs the power to the first drive half shaft 40 and the second drive after the shift variable torque is applied. The half shaft 41, and ultimately drives the vehicle to run.

As can be seen from the above description, the electric vehicle drive system provided by the present invention has the following advantages:

1. The present invention replaces a larger power drive motor with two smaller power drive motors, and the shifting and differential mechanism is centered (the shifting and differential mechanism 30 is located between the first drive motor 10 and the second drive motor 11). The invention solves the problem that the shifting and differential mechanism which are arranged when a large power motor is used is inconvenient, and the arrangement of the front warehouse is more convenient, flexible and practical.

2. The invention adopts two smaller power drive motors to replace a larger power drive motor, and the shifting and differential mechanism are centered, which solves the problem that the powertrain position occurring when using a larger power motor is biased to one side and causes left and right suspension. Designing difficult problems simplifies the design of the suspension.

3. The invention adopts two smaller power drive motors to replace a larger power drive motor, and the shifting and differential mechanisms are placed in the middle, so that the shifting and differential mechanisms may be arranged in the center position of the left and right tires, so that the driving half shaft is symmetric. It is possible that if the driving half-axis is symmetric, the left and right driving half shafts will be identical, which can reduce the development time and development cost of the driving half shaft.

4. The invention adopts two smaller power drive motors to replace a larger power drive motor, and the shifting and differential mechanism is centered, so that the mass distribution on both sides of the shifting and differential mechanism is relatively uniform, and a large power motor is solved. The powertrain quality that occurs at the time is concentrated on the problem of a serious imbalance in the mass distribution on the side of the high-power motor.

The present invention has been exemplarily described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited to the above-described manner, as long as various improvements made by the method concept and technical solution of the present invention are adopted, or directly applied to other Occasionally, it is covered by the scope of the present invention.

Claims

Claim

1. An electric vehicle drive system, comprising: a first drive motor (10), a second drive motor (11), and a shifting, differential mechanism (30), a shifting, differential mechanism (30), The first drive motor (10) and the second drive motor (11) are distributed on both sides of the shifting and differential mechanism (30) to collectively input power to the shifting and differential mechanism (30).

The electric vehicle drive system according to claim 1, wherein said first drive motor (10) and said second drive motor (11) are coaxially disposed.

The electric vehicle drive system according to claim 1, wherein said first drive motor (10) and said second drive motor (11) are the same or different drive motors.

The electric vehicle drive system according to any one of claims 1 to 3, wherein the rotor shaft of the first drive motor (10), the input shaft of the shifting and differential mechanism (30), and the The rotor shaft of the two drive motor (11) is coaxial;

Alternatively, the first drive motor (10) is coaxial with the input shaft of the shifting and differential mechanism (30), and is coupled to the second drive motor (11) by a spline/coupling;

Alternatively, the first drive motor (10) and the second drive motor (11) are respectively connected to the input shafts of the deceleration and differential mechanisms (30), and then directly or indirectly connected together.

The electric vehicle drive system according to any one of claims 1 to 3, further comprising a control system for controlling the first drive motor (10) and the second drive motor (11), respectively.

6. The electric vehicle drive system according to claim 5, wherein said control system comprises a motor controller (60) that controls the first drive motor (10) and the second drive motor (11), Both the speed control mode or the torque control mode are used, or the speed control mode or the torque control mode is used respectively.

7. The electric vehicle drive system according to claim 6, wherein said motor controller (60) comprises a first control module (70) and a second control module (80), and the first control module (70) The second drive motor (11) is controlled, and the second control module (80) controls the first drive motor (10).

8. The electric vehicle drive system according to any one of claims 6 or 7, wherein the control system further comprises a vehicle controller (100), which is coupled to the first control module (70), The control modules (80) are connected by a CAN communication bus (90).

9. The electric vehicle drive system according to claim 8, wherein said first control module (70) and said second control module (80) exchange information via a CAN communication bus.

10. The electric vehicle drive system according to any one of claims 1 to 3, 6, 7, and 9, further comprising a power source (20) to said first drive motor (10) and The second drive motor (11) is powered.

11. The electric vehicle drive system according to any one of claims 1 to 3, 6, 7, and 9, wherein said first drive motor (10) and second drive motor (11) have power output To the input shaft of the shifting and differential mechanism (30), the shifting and differential mechanism (30) outputs power to the first driving half shaft (40) and the second driving half shaft after the shifting variable torque (41), and drive the wheel (50) to run.