CN203246318U - Four-wheel driven hybrid power system with double-shaft - Google Patents

Abstract

The utility model relates to a two-axle four-wheel drive hybrid power system, which comprises a front axle drive system, a rear axle drive system, a battery pack and a vehicle controller. The front axle drive system includes an engine, a front axle drive motor, a front axle Motor controller, gearbox, automobile front axle and front axle reducer, the engine is equipped with an engine control system, and the gearbox is connected to a gearbox controller; the rear axle drive system includes two rear axle inner rotor hub motors, The rear wheel of the car, the wheel reducer and the rear axle motor controller; the front axle motor controller and the rear axle motor controller are all connected to the battery pack on the car, the battery pack is provided with a battery management system, and the engine control The system, front axle motor controller, gearbox controller, rear axle motor controller and battery management system are all connected with the vehicle controller. The beneficial effects of the utility model are: the transmission system is simplified, the weight of parts is reduced, the layout of the whole vehicle is beneficial, and the performance of the vehicle is improved.

Description

Two-axle four-wheel drive hybrid system

technical field

The utility model relates to a biaxial four-wheel drive hybrid power system, which belongs to the technical field of automobiles. the

Background technique

With the increasing emphasis on energy security and environmental protection in the world, countries have become more and more strict on vehicle emissions. Reducing dependence on energy and achieving energy conservation and emission reduction has become an urgent problem to be solved for the sustainable development of the world economy. . Hybrid vehicles and pure electric vehicles have become the development trend of today's automobile industry. Gasoline-electric hybrid vehicles combine the motor and the engine to achieve reasonable energy-saving and emission-reduction effects for various working conditions. Hybrid functions such as idling stop, motor starting, intelligent charging, regenerative braking, motor assist, and electric crawling, etc., have The advantages of reducing fuel consumption, increasing mileage, and relatively high technology maturity are the preferred trends in the development of the automotive industry at present. the

At present, the driving mode often adopted by general hybrid electric vehicles is the front-drive mode. When this front-drive mode is actually used, the power performance of the whole vehicle is relatively weak, and it is not easy to realize the pure electric drive function. For some plug-in hybrid electric vehicles, in order to achieve pure electric drive capability, the electric drive gearbox needs to be redesigned. The development cycle is longer and the technical risk is higher. Therefore, the drive mode of existing hybrid electric vehicles needs to be further improved. the

Utility model content

The purpose of this utility model is to provide a two-shaft four-wheel drive hybrid power system, which fully utilizes the existing mature engine, gearbox and motor technology, without redesigning the electric drive gearbox, with short development period and low technical risk. the

The purpose of this utility model is to realize through the following technical solutions:

A two-axle four-wheel drive hybrid power system includes a front axle drive system, a rear axle drive system, a battery pack and a vehicle controller, the front axle drive system includes an engine, a front axle drive motor, a front axle motor controller, The gearbox, the front axle of the car and the front axle reducer, the engine is connected with the front axle drive motor, the engine is equipped with an engine control system (EMS), and the front axle drive motor is connected with a front axle motor controller (MCU). The rotating shaft of the shaft drive motor is connected with a gearbox, the gearbox is connected with a transmission controller (TCU), and the gearbox is connected with the front axle reducer installed on the front axle of the car; the rear axle drive system includes two Rear axle inner rotor hub motor, car rear wheel, wheel reducer and rear axle motor controller, the two rear axle inner rotor hub motors are respectively connected with the wheel reducer installed on the rear wheel of the car, the two rear axle inner A rear axle motor controller (MCU) is connected to the rotor hub motor; both the front axle motor controller and the rear axle motor controller are connected to the battery pack on the car, and the battery pack is equipped with a battery management system, and the engine control The system, front axle motor controller, gearbox controller, rear axle motor controller and battery management system are all connected with the vehicle controller (VCU).

Further, the connection between the front axle driving motor and the front axle motor controller and between the rear axle inner rotor hub motor and the rear axle motor controller are all connected by AC high-voltage wire harnesses. the

Further, the connection between the front axle motor controller and the battery pack and between the rear axle motor controller and the battery pack is connected by a DC high-voltage wire harness. the

Further, the engine control system, the front axle motor controller, the gearbox controller, the rear axle motor controller and the battery management system are all connected to the vehicle controller through the CAN bus. the

Preferably, the front axle drive motor and the rear axle inner rotor hub motor are asynchronous motors or permanent magnet synchronous motors. the

Preferably, the gearbox is a mechanical automatic gearbox, a dual clutch gearbox, an automatic gearbox or a continuously variable gearbox. the

Preferably, the battery pack is a lithium battery, a nickel metal hydride battery, a nickel cadmium battery or a super capacitor. the

The beneficial effect of the utility model is that parts such as transfer case and intermediate transmission shaft of the traditional four-wheel drive vehicle are omitted, the transmission system is simplified, the weight of the parts is reduced, the whole vehicle layout is beneficial, and the vehicle performance is improved. It can be applied to non-plug-in hybrid vehicles and can also be applied to plug-in hybrid vehicles. the

Description of drawings

Below according to accompanying drawing, the utility model is described in further detail. the

Fig. 1 is a schematic structural diagram of a dual-shaft four-wheel drive hybrid power system described in an embodiment of the present invention. the

In the picture:

1. Engine; 2. Front axle drive motor; 3. Rear axle inner rotor hub motor; 4. Vehicle controller; 5. Engine control system; 6. Front axle motor controller; 7. Gearbox; 8. Gearbox Controller; 9. Automobile front axle; 10. Front axle reducer; 11. Rear wheel; 12. Wheel reducer; 13. Rear axle motor controller; 14. Battery pack; 15. Battery management system; 16. Front axle drive system; 17. Rear axle drive system.

Detailed ways

As shown in Figure 1, a dual-axle four-wheel drive hybrid power system described in the embodiment of the present invention includes a front axle drive system 16, a rear axle drive system 17, a battery pack 14 and a vehicle controller 4. Front axle drive system 16 comprises engine 1, front axle drive motor 2, front axle motor controller 6, gearbox 7, automobile front axle 9 and front axle reducer 10, and engine 1 is connected with front axle drive motor 2, and engine 1 An engine control system 5 is provided, and a front axle motor controller 6 is connected to the front axle drive motor 2 through an AC high-voltage wire harness. A gearbox 7 is connected to the rotating shaft of the front axle drive motor 2, and a transmission gearbox 7 is connected to The box controller 8, the gearbox 7 are connected with the front axle speed reducer 10 installed on the front axle 9 of the automobile; the rear axle drive system 17 includes two rear axle inner rotor hub motors 3, automobile rear wheels 11, wheel speed reducers 12 and rear axle motor controller 13, the two rear axle inner rotor hub motors 3 are respectively connected with the wheel side reducer 12 installed on the rear wheel 11 of the automobile, and the two rear axle inner rotor hub motors 3 are connected through the AC high voltage wiring harness A rear axle motor controller 13 is connected; the front axle motor controller 6 and the rear axle motor controller 13 are all connected to the battery pack 14 on the automobile through a DC high-voltage wire harness, and the battery pack 14 is provided with a battery management system 15, so The engine control system 5, the front axle motor controller 6, the gearbox controller 8, the rear axle motor controller 13 and the battery management system 15 are all connected to the vehicle controller 4 through the CAN bus. the

In actual production, the front axle drive motor 2 and the rear axle inner rotor hub motor 3 may be asynchronous motors or permanent magnet synchronous motors. When using an asynchronous motor, its connection mode is that the engine 1 and the front axle drive motor 2 are connected by a belt, and the output shaft of the engine 1 is connected with the input shaft of the gearbox 7 . When using a permanent magnet synchronous motor, the connection mode is that the output shaft of the engine 1 is connected to one end of the front axle drive motor 2, and the other end of the front axle drive motor 2 is connected to the input end of the gearbox 7, and the engine 1, front axle drive motor 2 and gearbox 7 are coaxially connected. In the utility model, the front axle drive motor 2 and the rear axle inner rotor hub motor 3 are all controlled by a motor controller. In actual use, an independent motor controller can be used to control the front axle drive motor 2 and the rear axle drive motor 2 respectively. The in-shaft rotor hub motor 3 may also be uniformly controlled by a centralized motor controller to control the front shaft drive motor 2 and the rear shaft inner rotor hub motor 3 . the

In the present invention, the gearbox 7 may be an automatic mechanical gearbox AMT, a dual clutch gearbox DCT, an automatic gearbox AT and a continuously variable gearbox CVT. The battery pack 14 can be a lithium battery, a nickel-metal hydride battery, a nickel-cadmium battery or a super capacitor. The wheel reducer 12 adopts a planetary row structure, and the inner rotor of the rear axle inner rotor hub motor 3 is connected to the sun gear of the planetary row , the planet carrier is connected with the wheel hub of the vehicle, and the ring gear is fixed. the

The dual-shaft four-wheel drive hybrid power system of the utility model can realize the pure electric drive of the rear axle, the hybrid power drive of the front axle and the dual-shaft four-wheel drive functions. When the vehicle starts or runs at low speed and the battery SOC (battery state of charge) is high, the vehicle runs in the pure electric drive mode, and the two rear axle inner rotor hub motors 3 drive the vehicle through the wheel reducer 12. At this time, the front axle of the vehicle Engine 1 and front axle drive motor 2 of 9 do not work, and gearbox 7 is placed in neutral gear. When the battery SOC (battery state of charge) is low or the vehicle is running at high speed, the vehicle is running in the front axle hybrid mode. At this time, the engine 1 and the front axle drive motor 2 drive the vehicle through the gearbox 7, and the front axle drive motor 2 is connected to the engine. 1 to optimize the working point of the engine 1 to improve the efficiency of the engine 1, and the gearbox 7 performs economical shifting or power shifting according to the driver's input. The two rear axle inner rotor hub motors 3 do not work. When the driver steps on the full throttle, the vehicle runs in the two-axle four-wheel drive mode, the engine 1, the front axle drive motor 2, and the rear axle inner rotor hub motor 3 are driven simultaneously, and the vehicle has the best dynamic performance. the

In the above three modes, if the vehicle coasts or brakes, the front axle drive motor 2 and the rear axle inner rotor hub motor 3 can perform braking energy recovery. in:

Vehicle coasting refers to the working condition that when the vehicle speed is higher than a certain threshold, the driver releases the accelerator pedal and does not step on the brake pedal; at this time, the torque of braking energy recovery is only related to the vehicle speed. The higher the vehicle speed, the greater the torque for regenerative braking. As the vehicle speed decreases, the torque of braking energy recovery also decreases.

Vehicle braking refers to the working condition that when the vehicle speed is higher than a certain threshold, the driver releases the accelerator pedal and depresses the brake pedal; at this time, the torque of braking energy recovery is related to the vehicle speed and the stroke of the brake pedal. The higher the vehicle speed, the greater the stroke of the brake pedal, and the greater the torque of the braking energy recovery; the reduction of the vehicle speed and the decrease of the stroke of the brake pedal, the torque of the braking energy recovery also decreases. the

The energy recovery strategies of coasting and braking modes are the same, but the torque values of energy recovery are inconsistent. This is because when the vehicle is braking, the load on the front axle is greater than that on the rear axle, so the braking energy recovery torque of the front axle can be greater than the braking energy recovery torque of the rear axle. For the energy recovery in the process of vehicle gliding and vehicle braking, it is necessary to detect the slip rate of the wheel. If the slip ratio is too large, there will be a tendency to lock the wheels, and the torque for energy recovery needs to be canceled. the

Among the three modes, different braking energy recovery strategies can be adopted for different driving modes. Specifically divided into the following three situations:

1) The energy recovery strategy in the rear axle pure electric drive mode; the energy recovery torque in this mode is realized by the two rear axle inner rotor hub motors 3 .

2) The energy recovery strategy in the front axle hybrid mode; the energy recovery torque in this mode is all realized by the front axle drive motor 2. the

3) The energy recovery strategy in the two-axis four-wheel drive mode; the energy recovery torque in this mode is jointly realized by the front axle drive motor 2 and the rear axle inner rotor hub motor 3; when the vehicle is coasting or braking, the front and rear axle motors follow the The optimal braking force distribution ratio is distributed. the

The utility model is not limited to the above-mentioned best implementation mode, anyone can draw other various forms of products under the enlightenment of the utility model, but no matter make any changes in its shape or structure, all have the same features as the application Or similar technical schemes all fall within the protection scope of the present utility model. the

Claims (7)

1. twin shaft four-wheel driven hybrid power system, comprise front axle drive system (16), rear axle drive system (17), power brick (14) and entire car controller (4), it is characterized in that: described front axle drive system (16) comprises driving engine (1), front axis drive motor (2), front axle electric machine controller (6), change speed gear box (7), automobile front axle (9) and front axle retarder (10), driving engine (1) is connected with front axis drive motor (2), driving engine (1) is provided with engine management system (5), be connected with front axle electric machine controller (6) on the front axis drive motor (2), be connected with change speed gear box (7) on the turning cylinder of described front axis drive motor (2), be connected with gearbox control (8) on the change speed gear box (7), change speed gear box (7) is connected with front axle retarder (10) on being installed on automobile front axle (9); Described rear axle drive system (17) comprises two rear axle internal rotor wheel hub motors (3), automobile back wheel (11), wheel reduction gear (12) and rear axle electric machine controller (13), two rear axle internal rotor wheel hub motors (3) respectively be installed on automobile back wheel (11) on wheel reduction gear (12) be connected, be connected with rear axle electric machine controller (13) on two rear axle internal rotor wheel hub motors (3); Described front axle electric machine controller (6) is connected 13 with the rear axle electric machine controller) all be connected with power brick (14) on the automobile, power brick (14) is provided with battery management system (15), and described engine management system (5), front axle electric machine controller (6), gearbox control (8), rear axle electric machine controller (13) are connected 15 with battery management system) all be connected with entire car controller (4).

2. twin shaft four-wheel driven hybrid power system according to claim 1 is characterized in that: all adopt the ac high-voltage wire harness to be connected between described front axis drive motor (2) and the front axle electric machine controller (6) and between rear axle internal rotor wheel hub motor (3) and the rear axle electric machine controller (13).

3. twin shaft four-wheel driven hybrid power system according to claim 2 is characterized in that: all adopt the high direct voltage wire harness to be connected between described front axle electric machine controller (6) and the power brick (14) and between rear axle electric machine controller (13) and the power brick (14).

4. twin shaft four-wheel driven hybrid power system according to claim 3, it is characterized in that: described engine management system (5), front axle electric machine controller (6), gearbox control (8), rear axle electric machine controller (13) are connected 15 with battery management system) all be connected with entire car controller (4) by the CAN bus.

5. twin shaft four-wheel driven hybrid power system according to claim 4, it is characterized in that: described front axis drive motor (2) and rear axle internal rotor wheel hub motor (3) are asynchronous dynamo or permagnetic synchronous motor.

6. twin shaft four-wheel driven hybrid power system according to claim 5 is characterized in that: described change speed gear box (7) is mechanical automatic speed-changing case, double clutch gearbox, Automatic Transmission or progressive gear transmission.

7. twin shaft four-wheel driven hybrid power system according to claim 6 is characterized in that: described power brick (14) is lithium cell, Ni-MH battery, nickel-cadmium cell or super capacitor.

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