CN101913322B - Time-division 4-wheel drive (4WD) parallel hybrid driving system - Google Patents

Abstract

The invention provides a time-sharing four-wheel drive parallel hybrid drive system, which belongs to the technical field of automobiles. It solves the problem of low energy utilization rate of the power system of the existing gasoline-electric four-wheel-drive hybrid electric vehicle. The time-sharing four-wheel drive parallel hybrid drive system includes an engine, a storage battery, and a first motor and a second motor capable of converting electrical energy and mechanical energy. The engine is connected to the first automobile axle, and an engine controller is connected to the engine. When the engine works, the first motor axle can be driven to work, the second motor is connected with the second motor axle, the second motor is connected with a second motor controller, and the first motor is connected between the engine and the first motor controller When the engine is in the working state, the first motor can charge the storage battery driven by the engine, and the second motor can charge the storage battery when the mechanical energy is converted into electrical energy. The invention has the advantages of strong power, high energy utilization rate, energy saving and environmental protection.

Description

Part-time four-wheel drive parallel hybrid drive system

technical field

The invention belongs to the technical field of automobiles and relates to automobile power systems, in particular to a time-sharing four-wheel-drive parallel hybrid drive system.

Background technique

With the growing demand for environmental protection and the increasing shortage of non-renewable resources such as petroleum, many automakers are paying more and more attention to the research and development of energy-saving and emission-reducing models, and various hybrid vehicles are gradually coming out. Under the background of the existing technology, the four-wheel drive hybrid electric vehicle can meet the needs of energy and environmental protection to the greatest extent, so it has more market prospects. The configurations of hybrid electric vehicle power systems developed at present include series, parallel and hybrid.

For the parallel four-wheel drive hybrid power system, people have carried out long-term exploration and put forward various improvement schemes. For example, the Chinese patent literature discloses a drive system and its control method for a four-wheel-drive hybrid vehicle [Application No.: CN200910040759.1]. The drive system includes a power battery, a front drive unit, a rear drive unit, and controls The vehicle controller for the work of the rear drive unit, the key is that the front drive unit is an engine installed on the front drive axle, a front axle ISG motor and a front reducer connected to the engine through a transmission, and the rear drive unit is installed The ISG motor of the rear axle on the rear drive axle and the rear speed reducer connected with the ISG motor of the rear axle through the transmission device, the ISG motor of the front axle and the ISG motor of the rear axle are respectively electrically connected with the power battery through the inverter. The ratio of the peak power of the bridge ISG motor to the rated power of the engine is above 40%. Someone else invented a gasoline-electric four-wheel-drive hybrid vehicle power system and its control method [Application No.: CN200910242538.2]. The system uses the motor and the engine as independent power sources to drive the front and rear wheels of the vehicle wheel, using a motor controller to control the operation of the motor, using an engine controller to control the operation of the engine, using a vehicle controller to control the work of the engine controller and the motor controller, and the vehicle controller according to the vehicle Equipment parameters and operating parameters determine the driving mode of the vehicle and the switching between different driving modes. The control modes include self-test mode, pure motor drive mode, pure engine drive mode, motor single drive mode, engine single drive mode Driving mode, motor-engine dual driving mode and power-off mode.

The above scheme has improved the parallel four-wheel drive hybrid power system to a certain extent, but there are still technical problems such as insufficient power, low energy utilization rate, high energy loss, relatively complex overall structure, and low working stability.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide a time-sharing four-wheel drive parallel hybrid drive system with strong power, high energy utilization rate, energy saving and environmental protection, and reasonable overall layout.

In order to achieve the above object, the present invention adopts the following technical proposals: the time-sharing four-wheel-drive parallel hybrid drive system is arranged between the first automobile bridge and the second automobile bridge, and the drive system includes a motor, a storage battery, and a The first motor and the second motor for converting electric energy and mechanical energy are characterized in that the engine is connected with the first automobile axle, and the engine is connected with an engine controller capable of controlling the operation of the engine, and can drive the first motor when the engine is working. An automobile axle works, the second motor is connected with the second automobile axle, and the second motor is connected with the second motor controller connected with the storage battery and capable of controlling the work of the second motor. When it is converted into a mechanical energy working state, it can drive the second automobile bridge to work. The first motor is connected between the engine and the first motor controller that can control the operation of the first motor and is connected to the battery. When the engine is in the working state Driven by the engine, the first motor can charge the storage battery, and the second motor can charge the storage battery when the second motor is in the working state of converting mechanical energy into electrical energy.

The engine and the second motor in the present invention can drive the car independently or simultaneously, and are suitable for various driving conditions. The driving range is equivalent to that of a traditional internal combustion engine, and can also be connected to an external power source, which greatly reduces fuel consumption and emissions. An ideal hybrid drive solution. That is to say, through the engine and the second electric motor, three driving forms, including all-wheel drive, independent front-wheel drive and independent rear-wheel drive, can be realized to meet the driving needs of various working conditions. At the same time, it can also realize pure electric driving and recover braking energy through the first motor and the second motor, thereby greatly improving the fuel economy of the vehicle and reducing emissions. Here, the first motor only has the function of generating electricity, while the second motor has both the driving function and the function of generating electricity. The first motor controller can control the operation of the first motor, the second motor controller can control the operation of the second motor, and the second motor controller can control the second motor to rotate forward or reversely.

In the above-mentioned time-sharing four-wheel drive parallel hybrid drive system, the engine controller, the first motor controller and the second motor controller are all connected to the vehicle controller. The vehicle controller controls the operation of the engine controller, the first motor controller and the second motor controller according to different working conditions and road conditions, thereby adjusting the driving mode.

In the above-mentioned time-sharing four-wheel drive parallel hybrid drive system, the output end of the engine is connected to an automatic transmission, and the automatic transmission is connected to the first automobile axle through the first reduction differential mechanism.

In the above time-sharing four-wheel drive parallel hybrid drive system, the automatic transmission is coupled with an engine gear, the first motor is coupled with a motor gear, and the engine gear is meshed with the motor gear.

In the above-mentioned time-sharing four-wheel-drive parallel hybrid drive system, the second motor is coupled with the second axle of the vehicle through the second speed reduction differential mechanism.

In the above-mentioned time-sharing four-wheel drive parallel hybrid drive system, the storage battery is a battery pack.

In the above-mentioned time-sharing four-wheel drive parallel hybrid drive system, the first automobile axle is the front axle of the automobile, and the second automobile axle is the rear axle of the automobile. Of course, it is also feasible that the first automobile axle is the automobile rear axle, and the second automobile axle is the automobile front axle.

Compared with the existing technology, the advantages of the time-sharing four-wheel-drive parallel hybrid drive system are: 1. Reasonable design, strong power, suitable for various driving conditions, and the driving range is equivalent to that of traditional internal combustion engines. 2. Greatly reduce fuel consumption and emissions, improve the fuel economy of the vehicle while ensuring power performance, and achieve the goals of reducing operating costs and energy conservation and environmental protection.

Description of drawings

Fig. 1 is a structural block diagram provided by the present invention.

Among the figure, the first automobile bridge 1, the second automobile axle 2, the engine 3, the storage battery 4, the first motor 5, the second motor 6, the engine controller 7, the first motor controller 91, the second motor controller 92, Vehicle controller 10, automatic transmission 11, first reduction differential mechanism 12, engine gear 13, motor gear 14, second reduction differential mechanism 15.

Detailed ways

As shown in FIG. 1 , the time-sharing four-wheel drive parallel hybrid drive system is arranged between the first automobile axle 1 and the second automobile axle 2 . In this embodiment, the first automobile axle 1 is the front axle of the automobile, and the second automobile axle 2 is the rear axle of the automobile. Certainly, the first automobile axle is 1 automobile rear axle, and the second automobile axle 2 is also a feasible scheme for automobile front axle.

The drive system includes an engine 3, a storage battery 4, and a first motor 5 and a second motor 6 capable of converting electrical energy and mechanical energy. Wherein, the storage battery 4 is a battery pack. The engine 3 is connected with the first automobile axle 1, and an engine controller 7 capable of controlling the operation of the engine 3 is connected on the engine 3, and can drive the first automobile axle 1 to work when the engine 3 works. The second motor 6 is connected with the second automobile axle 2, and the second motor 6 is connected with the second motor controller 92 connected with the storage battery 4 and capable of controlling the work of the second motor 6. When the second motor 6 is in electric energy conversion It can drive the second automobile axle 2 to work when it is in the mechanical energy working state. The first motor 5 is connected between the engine 3 and the first motor controller 91 that can control the work of the first motor 5 and is connected with the storage battery 4. When the engine 3 is in a working state, the first motor 5 can be driven by the engine 3 Charge the battery 4. The second motor 6 can charge the storage battery 4 when it is in the working state of converting mechanical energy into electrical energy.

The engine controller 7 , the first motor controller 91 and the second motor controller 92 are all connected with the vehicle controller 10 . The vehicle controller 10 controls the operation of the engine controller 7 , the first motor controller 91 and the second motor controller 92 according to different working conditions and road conditions, thereby adjusting the driving mode. The first motor controller 91 can control the first motor 5 to work, the second motor controller 92 can control the second motor 6 to work, and the second motor controller 92 can control the second motor 6 to rotate forward or reversely.

In this embodiment, the output end of the engine 3 is coupled with an automatic transmission 11 , and the automatic transmission 11 is coupled with the first automobile axle 1 through a first reduction differential mechanism 12 . The automatic transmission 11 is coupled with an engine gear 13 , the first motor 5 is coupled with a motor gear 14 , and the engine gear 13 is meshed with the motor gear 14 . The second motor 6 is coupled with the second automobile axle 2 through the second reduction differential mechanism 15 .

The engine 3 and the second electric motor 6 can realize three driving modes: all-wheel drive, front-wheel independent drive and rear-wheel independent drive, so as to meet the driving requirements of various working conditions. At the same time, it can also realize pure electric driving and recover braking energy through the first motor 5 and the second motor 6, thereby greatly improving the fuel economy of the whole vehicle and reducing emissions. Here, the first motor 5 only has the function of generating electricity, while the second motor 6 has both the function of driving and the function of generating electricity.

The detailed working process of the time-sharing four-wheel drive parallel hybrid drive system is as follows:

① start

When the SOC value of the storage battery 4 is high, the second motor 6 drives the second automobile axle 2 to start in a purely electric manner; And charge the storage battery 4 at the same time.

② climbing

When the SOC value of the battery 4 is high, the engine 3 and the second electric motor 6 are jointly driven to realize four-wheel drive; when the SOC value of the battery 4 is lower than its set limit low value, only the engine 3 provides climbing power .

③ speed up

When the SOC value of the battery 4 is high, the engine 3 and the second motor 6 jointly drive to provide peak power to meet the driving power required for acceleration; when the SOC value of the battery 4 is low, only the engine 3 provides driving power.

④ Uniform speed

When the SOC value of the battery 4 is high and the driving speed is within the set pure electric maximum driving speed range, the vehicle is driven by the second motor 6, and the engine 3 does not work; when the SOC value of the battery 4 is low, the engine 3 Drive the car, charge the battery when the power of the engine 3 is surplus, and keep the engine 3 working in the high-efficiency zone all the time.

⑤Braking or decelerating

When the brake pedal is lightly stepped on, the engine 3 is turned off. If the SOC of the battery 4 permits, the first motor 5 and the second motor 6 work in the power generation state, and both the first automobile axle 1 and the second automobile axle 2 perform braking energy. Recycling, charging the storage battery 4; when the brake pedal is heavily depressed, the first motor 5 and the second motor 6 provide braking torque, and the mechanical brake also participates in braking.

⑥ reversing

When the SOC value of the battery 4 is high, the second motor 6 reverses, and the driving power is provided by the second motor 6; when the SOC value of the battery 4 is low, the driving power is provided by the engine 3 via the automatic transmission 11 to realize reverse driving .

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although this article uses the first automobile axle 1, the second automobile axle 2, the engine 3, the storage battery 4, the first motor 5, the second motor 6, the engine controller 7, the first motor controller 91, the second motor Controller 92, vehicle controller 10, automatic transmission 11, first reduction differential mechanism 12, engine gear 13, motor gear 14, second reduction differential mechanism 15 and other terms, but the possibility of using other terms is not excluded . These terms are used only for the purpose of describing and explaining the essence of the present invention more conveniently; interpreting them as any kind of additional limitation is against the spirit of the present invention.

Claims (4)

1. time-division 4-wheel drive (4 WD) parallel hybrid driving system, be arranged between the first automobile bridge (1) and the second automobile bridge (2), this drive system comprises driving engine (3), storage battery (4), and the first motor (5) and second motor (6) that can carry out electric energy and mechanical energy conversion, it is characterized in that, described driving engine (3) links with the first automobile bridge (1), driving engine (3) first line of a couplet be connected to can control engine (3) engine controller (7) of work, when working, driving engine (3) can drive the first automobile bridge (1) work, described the second motor (6) links with the second automobile bridge (2), be connected to the second electric machine controller (92) that links with storage battery (4) and can control the second motor (6) work at the second motor (6) first line of a couplet, when being in, the second motor (6) can drive the second automobile bridge (2) work when electric energy is converted to the mechanical energy mode of operation, described the first motor (5) be connected to driving engine (3) and can control the first motor (5) work and and the first electric machine controller (91) of linking of storage battery (4) between, when driving engine (3) is in running order the first motor (5) can be under the drive of driving engine (3) to storage battery (4) charging, can charge to storage battery (4) when described the second motor (6) is in mechanical energy and is converted to the electric energy mode of operation; Described engine controller (7), the first electric machine controller (91) and the second electric machine controller (92) all link with entire car controller (10); The mouth of described driving engine (3) is connected with automatic transmission with hydraulic torque converter (11), and described automatic transmission with hydraulic torque converter (11) links by the first deceleration box of tricks (12) and the first automobile bridge (1); Described automatic transmission with hydraulic torque converter (11) first line of a couplet is connected to engine gear (13), and described the first motor (5) first line of a couplet is connected to motor gear (14), and described engine gear (13) is meshed with motor gear (14); The first electric machine controller (91) can be controlled the first motor (5) work, and the second electric machine controller (92) can be controlled the second motor (6) work, and the second electric machine controller (92) can be controlled the second motor (6) forward or reverse.

2. time-division 4-wheel drive (4 WD) parallel hybrid driving system according to claim 1 is characterized in that, described the second motor (6) links by the second deceleration box of tricks (15) and the second automobile bridge (2).

3. time-division 4-wheel drive (4 WD) parallel hybrid driving system according to claim 1 and 2 is characterized in that, described storage battery (4) is battery pack.

4. time-division 4-wheel drive (4 WD) parallel hybrid driving system according to claim 1 and 2 is characterized in that, described the first automobile bridge (1) is automobile front axle, and described the second automobile bridge (2) is automobile axle.

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