CN102166949A - Electric-auxiliary hybrid power vehicle drive system - Google Patents

Abstract

The drive system of the electrically assisted hybrid electric vehicle provided by the present invention is composed of a front wheel drive device and a rear wheel drive device, wherein the front wheel drive device mainly consists of a front engine (3), an engine controller (12), a transmission (2 ), the front engine is mechanically connected to the transmission (2), and is electrically connected to the engine controller (12), the front engine is controlled by the engine controller, and the transmission outputs power to drive the front wheels; Composed of a battery (5), a controller and a motor, wherein the controller is electrically connected to and controls the motor, the power battery (5) is electrically connected to the motor, and the motor is controlled by the controller to drive the rear wheels; the front engine (3) and There is no power connection between the motors, and they are switched through the power conversion device (4) to realize the conversion of the driving mode of the vehicle. The invention has the advantages of simple structure, convenient control, low price, convenient maintenance and the like.

Description

Electric Assisted Hybrid Electric Vehicle Drive System

technical field

The invention relates to a driving system of a hybrid electric vehicle, in particular to an electric auxiliary driving system of a hybrid electric vehicle.

Background technique

Compared with internal combustion locomotives, electric vehicles have the advantages of no exhaust emissions, low noise, and energy saving. Existing electric vehicles are all powered by a single battery, and the phenomenon of power supply stoppage may not occur when this vehicle travels in the city, but if it is carried out for long-distance travel, the battery power supply is insufficient, which limits the development of electric vehicles.

In a modern general series hybrid electric vehicle drive system, a high-power motor is driven through galvanic coupling to drive the vehicle. The engine is also an auxiliary power system for charging the power battery. This solution requires a relatively high-power drive motor and has high performance requirements for the power battery. Generally, this system is a system with a high degree of hybridization, and most of them add an additional generator. . Due to the relatively large electrical related power devices (such as DC-DC power converters, IGBTs) required by the motor directly driving the car, the cost is high and the instability of the motor rotation is easy to burn out the high-power devices and batteries, and the series hybrid The power is generally added to the energy recovery system. Although part of the energy is recovered to a certain extent, frequent charging and discharging greatly reduces the life of the power battery. The biggest problem now is that the price of power batteries is relatively expensive, and it is difficult to popularize them.

In the drive system of modern parallel hybrid electric vehicles, the power of the engine and the motor is generally combined through the electromechanical coupling device to drive the wheels. Nowadays, the mechanical coupling method of planetary gears is often used to make the engine work in the high-efficiency area as much as possible. However, these parallel Due to the use of more complex control methods and electromechanical coupling methods in the hybrid method, the cost in the development process is relatively high, and because the operating conditions of the vehicle are more complicated, it is difficult to design hypothetical designs with several driving conditions. In the actual test, the driving scheme did not achieve satisfactory power and economy. The compound hybrid electric vehicle combines the advantages of series connection and parallel connection, but it is more difficult to control, and the cost of device selection is higher, which is basically only suitable for some high-end vehicles.

In the drive system of modern new energy vehicles, including hydrogen energy vehicles, fuel cell vehicles, supercapacitor batteries, flywheel batteries, etc., are in the experimental stage, and there is still a long way to go before they can be used in mass-produced models.

Contents of the invention

The technical problem to be solved by the present invention is to provide a new type of high-efficiency and simple-structured electrically-assisted hybrid electric vehicle drive system in order to overcome the above-mentioned deficiencies in the prior art.

The technical scheme that the present invention adopts to solve its technical problem is: be made up of front-wheel driving device and rear-wheel driving device. Wherein: the front-wheel drive device is mainly composed of a front engine, an engine controller, and a transmission. The front engine is mechanically connected to the transmission and electrically connected to the engine controller. The front engine is controlled by the engine controller and output through the transmission. Power drives the front wheels; the rear wheel drive device is mainly composed of a power battery, a controller and a motor, wherein the controller is electrically connected to and controls the motor, the power battery is electrically connected to the motor, and the motor is controlled by the controller to drive the rear wheels; the front There is no power connection between the engine and the motor, and they are switched through the power conversion device to realize the conversion of the driving mode of the car.

The power output shaft of the front engine can be connected with the input gear shaft of the manual transmission.

The power output shaft of the front engine can be connected with the input gear shaft of the automatic transmission.

The motor can be a rear motor, the output shaft of which is connected to the rear wheels through the rear drive axle, and is controlled by the accelerator pedal and the controller to drive the working state of the rear wheels, and the controller is a motor controller.

The motor can be two wheel hub motors, the output shafts of which are respectively connected to the left and right rear wheels, and both are controlled by an accelerator pedal and a controller to drive the working state of the rear wheels, and the controller is a wheel hub motor controller.

The engine controller, the motor controller and the hub motor controller are all connected with the accelerator pedal of the automobile through the power conversion device.

The power conversion devices are all controlled by manual electronic switches.

Compared with the prior art, the present invention has the following main advantages:

One. The control method is relatively simple and easy to implement, and the power is directly switched through the power switching device.

Second, for the sports car driven by the front two wheels, since the original design chassis contains the position where the rear drive shaft is installed, the rear wheels are directly driven by the rear motor plus the final reducer and differential. The existing front-wheel drive drivetrain is fully retained. For other front-wheel drive models, the rear wheels are directly driven by hub motors.

Its 3. The experimental data of many documents shows that the exhaust gas emission when the car is idling and low speed is increased by 30% compared with that of medium speed, and the fuel economy of the car when idling and low speed is frequently started and stopped is higher than that of medium speed. A drop of thirty to fifty percent. The technology of the present invention adopts electric drive when the urban traffic road is congested and low-speed driving, saves fuel, and can greatly reduce the engine idling speed and the emission of the car when the car is running at low speed; when driving under normal road conditions, the engine drive system is used to maintain the power of the original car The performance indicators of sex and economy remain basically unchanged.

Its four, the motor power that the present invention adopts is less than 5kW, and power battery capacity is less than 10Ah, and cost increases about 30,000, is much cheaper than existing hybrid electric vehicle.

Its five, the automobile front wheel among the present invention is driven by engine, and rear wheel is driven by motor, there is no power connection between the two, and the structure is simple.

In a word, the driving system of the electric-assisted hybrid electric vehicle of the present invention is completely different from the driving system used in hybrid electric vehicles seen so far in terms of working principle, and is a new type of high-efficiency hybrid driving system, which is economical and practical, and has a simple structure. , easy control, relatively low price, easy maintenance and other advantages.

Description of drawings

Fig. 1 is a schematic structural view of the present invention using a rear motor.

Fig. 2 is a schematic structural diagram of the present invention using two in-wheel motors.

Fig. 3 is a working flow chart of the drive system of an electrically assisted hybrid electric vehicle adopting a rear motor of the present invention.

Fig. 4 is a working flow chart of the electric auxiliary hybrid electric vehicle drive system adopting two in-wheel motors of the present invention.

In the figure: 1. Front drive axle; 2. Transmission; 3. Front engine; 4. Power conversion device; 5. Power battery; 6. Hub motor controller; 7. Hub motor; 8. Wheel; 9. Motor Controller; 10. Rear motor; 11. Rear drive axle; 12. Engine controller; 13. Accelerator pedal.

Detailed ways

The drive system of the electrically assisted hybrid electric vehicle provided by the invention is used for low-speed driving and short-distance driving (such as moving a parking space) when the vehicle is congested in urban traffic. The hybrid vehicle has two sets of driving devices that do not work at the same time: the front-wheel drive device composed of a traditional engine and transmission, and the rear-wheel drive device composed of a power battery, motor and corresponding controller. There is no power between the two connection relationship.

The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but is not limited to the content described below.

Electric auxiliary type hybrid electric vehicle driving system provided by the present invention, its structural block diagram as shown in Figure 1, is made up of front-wheel driving device and rear-wheel driving device, wherein: front-wheel driving device is mainly composed of front engine 3 and engine controller 12. The transmission 2 is composed; the engine controller 12 controls the front engine 3 through an electrical connection, and the front engine 3 is mechanically connected to the transmission 2 . The rear wheel drive device is mainly composed of a power battery 5, a motor controller 9 and a rear motor 10; wherein the motor controller 9 is electrically connected to control the rear motor 10, and the power battery 5 is electrically connected to supply power to the rear motor 10. The front engine 3 drives the front wheels in the wheels 8 independently by an accelerator pedal 13 and an engine controller 12 . The rear motor 10 independently drives the rear wheels in the wheels 8 by the accelerator pedal 13 and the motor controller 9; there is no power connection between the front engine 3 and the rear motor 10, and they are switched by the power conversion device 4, thereby realizing the driving of the vehicle way of conversion.

The engine controller 12 and the motor controller 9 are connected with the accelerator pedal 13 of the automobile through the power conversion device 4 . The driver selects the driving mode through the power conversion device 4 according to the driving road conditions, so that the accelerator pedal 13 controls the engine controller 12 and the motor controller 9 respectively, thereby controlling the front engine 3 or the rear motor 10 to realize engine drive or motor drive .

Another embodiment of the electric-assisted hybrid vehicle drive system provided by the present invention has a structural block diagram as shown in Figure 2, which consists of a front-wheel drive device and a rear-wheel drive device, wherein: the front-wheel drive The engine 3 is composed of an engine controller 12 and a transmission 2; the engine controller 12 controls the front engine 3 through an electrical connection, and the front engine 3 is mechanically connected to the transmission 2. The rear wheel driving device is mainly composed of a power battery 5, an in-wheel motor controller 6 and an in-wheel motor 7; wherein, the in-wheel motor controller 6 is electrically connected to control the in-wheel motor 7, and the power battery 5 is electrically connected to the in-wheel motor 7 powered by. Front engine 3 drives the front wheel in wheel 8 independently by accelerator pedal 13 and engine controller 12, and hub motor 7 drives the rear wheel in wheel 8 independently by accelerator pedal 13 and hub motor controller 6; Front engine 3 and There is no power connection between the in-wheel motors 7, and they are switched through the power conversion device 4, thereby realizing the conversion of the driving mode of the vehicle.

The engine controller 12 and the in-wheel motor controller 6 are connected with the accelerator pedal 13 of the automobile through the power conversion device 4 . The driver selects the driving mode through the power conversion device 4 according to the driving road conditions, so that the accelerator pedal 13 controls the engine controller 12 and the hub motor controller 6 respectively, thereby controlling the front engine 3 or the hub motor 7 to realize engine driving or motor driving. drive.

Described front drive axle 1, speed changer 2 and front engine 3 and wheel 8, its structure is all with prior art. Described wheel 8 comprises front wheel and rear wheel. The transmission 2 can be a manual transmission or an automatic transmission.

The power conversion device 4 is controlled by a manual electronic switch.

Described power battery 5 adopts the battery below 10Ah, and it is installed under the car rear seat.

The motor is used to drive the rear wheels and is a motor below 5kW, and two hub motors 7 or one rear motor 10 can be used.

The rear motor 10 can be used for a sports vehicle with front two-wheel drive. Because the original design chassis of the sports vehicle contains the position of the rear drive shaft, the rear motor can be used to add the rear drive axle 11 to directly drive the rear wheels, and its modification is small, directly using the existing front-wheel drive power transmission system. Other front-wheel drive models then directly adopt the wheel hub motor 7 to drive the rear wheels.

The present invention adopts front drive axle 1, speed changer 2, front engine 3, power battery 5, hub motor controller 6, hub type motor 7, wheel 8, motor controller 9, rear motor 10, rear drive axle 11, Engine controller 12 and accelerator pedal 13 are all prior art.

The electrically assisted hybrid vehicle provided by the present invention has a maximum vehicle speed of about 40 km/h and a driving range of about 50 km when the rear wheel is purely driven by electricity when driving in the city. Under normal road conditions, the driver can restore the traditional engine-driven driving by switching the power system, and its maximum speed, fuel consumption and other power and economic indicators are equivalent to those of the original car.

The working process of power switching will be briefly described below in conjunction with Fig. 3 and Fig. 4 .

When the shift lever is in neutral, the power conversion device 4 is artificially controlled to complete the conversion of the front-wheel drive device and the rear-wheel drive device. details as follows:

Referring to Figure 3, when the power conversion device 4 is placed in the "engine drive" position, the driver manipulates the engine controller 12 through the accelerator pedal 13 to control the vehicle speed, and the power and transmission system work in the same way as the original car, that is, the front wheels are driven wheel, driven by the engine; while the rear motor 10 is in a power-off state, its damping is small and idling does not generate electric load, so the power battery 5 will not be frequently charged and discharged, thereby prolonging the service life of the power battery. At this time, the rear wheel is driven wheel.

Referring to Fig. 3, for sports vehicles with front two-wheel drive, such as SUV, CRV and other models, a rear motor 10 with a rear drive axle is used to drive the rear wheels: when the power conversion device 4 is placed in the "motor drive" position, And simultaneously when shift lever is placed on " neutral gear ", then engine flameout, front-wheel drive device does not work, and front-wheel is driven wheel. The accelerator pedal 13 operates the motor controller 9 to control the vehicle speed, and the motor drives the rear wheels through the final drive and the differential in the rear drive axle, which is equivalent to a pure electric vehicle. Because the maximum speed of the designed pure electric drive is low, the mileage is short, and there is no mechanical connection between the engine and the electric motor transmission system, the structure is simplified, the control is simple, the price is relatively low, and the maintenance is convenient.

Referring to Figure 4, when the power conversion device 4 is placed in the "engine drive" position, the accelerator pedal 13 manipulates the engine controller 12 to control the vehicle speed, the power and transmission system work in the same way as the original car, that is, the front wheels are the driving wheels, and Driven by the engine; while the hub type motor 7 is in a power-off state, the motor idling does not produce an electric load, and the rear wheel is a driven wheel.

Referring to Fig. 4, for other front-wheel-drive models, the scheme of using the hub motor 7 to drive the rear wheels: when the power conversion device 4 is placed in the "motor drive" position and the shift lever is placed in "neutral" at the same time, through the power Conversion device 4 makes speed changer 2 be in neutral lock, engine flameout, front-wheel driving device does not work, and front-wheel is driven wheel. The driver manipulates the in-wheel motor controller 6 through the accelerator pedal 13 to control the rotation speed of the in-wheel motor 7, thereby controlling the vehicle speed of the automobile.

Claims (8)

1. An electrically assisted hybrid vehicle drive system, characterized in that it is composed of a front-wheel drive device and a rear-wheel drive device, wherein: the front-wheel drive device is mainly composed of a front engine (3) and an engine controller (12), transmission (2), the front engine (3) is mechanically connected to the transmission (2), and electrically connected to the engine controller (12), the front engine is controlled by the engine controller (12), and the transmission outputs power to drive the front wheel; the rear wheel drive device is mainly composed of a power battery (5), a controller and a motor, wherein the controller is electrically connected to and controls the motor, and the power battery (5) is electrically connected to the motor, which is controlled by the controller and driven wheel; there is no power connection between the front engine (3) and the motor, and they are switched through the power conversion device (4) to realize the conversion of the driving mode of the car. 2. The electric-assisted hybrid vehicle drive system according to claim 1, characterized in that the power output shaft of the front engine (3) passes through the half shaft of the transmission (2) and the front drive axle (1) connect. 3. The drive system of electric-assisted hybrid electric vehicle according to claim 1, characterized in that the motor adopts a rear motor (10), and there is only one rear motor, and its output shaft passes through the rear drive axle (11 ) is connected with the rear wheel, and the working state of the rear wheel is controlled by the controller, which is a motor controller (9). 4. The electric-assisted hybrid vehicle drive system according to claim 3, characterized in that the motor controller (9) is connected to the accelerator pedal (13) of the vehicle through the power conversion device (4). 5. The electric-assisted hybrid vehicle drive system according to claim 1, characterized in that the motor is a hub-type motor (7), and there are two hub-type motors, the output shafts of which are respectively connected to the left and right rear wheels , and both are controlled by a controller to drive the working state of the rear wheel, and the controller is an in-wheel motor controller (6). 6. The electric-assisted hybrid vehicle drive system according to claim 5, characterized in that the hub motor controller (6) is connected to the accelerator pedal (13) of the vehicle through a power conversion device (4). 7. The electric-assisted hybrid electric vehicle drive system according to claim 1, characterized in that the engine controller (12) is connected to the accelerator pedal (13) of the vehicle through the power conversion device (4). 8. The electric-assisted hybrid electric vehicle drive system according to claim 1, 4, 6 or 7, characterized in that the power conversion device (4) is operated by a manual electronic switch.

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