CN110605960A

CN110605960A - Series-parallel hybrid power vehicle power system configuration and control method

Info

Publication number: CN110605960A
Application number: CN201910881129.0A
Authority: CN
Inventors: 伍庆龙
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2019-12-24

Abstract

The invention discloses a series-parallel hybrid vehicle power system configuration and a control method, belonging to the technical field of automobiles, wherein the series-parallel hybrid vehicle power system configuration comprises an engine and a BSG motor, wherein the BSG motor is in transmission connection with the engine, the engine is connected to a gearbox through a first clutch, and the output end of the gearbox is connected to a front wheel through a first transmission mechanism; the main motor is connected to the rear wheel through a second clutch and a second transmission mechanism; and the power battery is connected with the main motor and the BSG motor. And the system controller is electrically connected with the engine, the main motor, the BSG motor, the power battery and the gearbox respectively. Compared with the prior art, can realize solitary pure electric rear-drive function through main motor, realize forerunner's function through BSG motor and engine, realize the four-wheel drive function through BSG motor, engine and main motor to can charge power battery, retrieve braking energy, realize reducing the emission when economizing on fuel.

Description

Series-parallel hybrid power vehicle power system configuration and control method

Technical Field

The invention relates to the technical field of automobiles, in particular to a series-parallel hybrid power vehicle power system configuration and a control method.

Background

In order to effectively reduce the fuel consumption and exhaust emission of automobiles, more and more automobile manufacturers promote and research and develop hybrid electric vehicles. At present, the power system configuration of the hybrid electric vehicle includes a series connection type, a parallel connection type and a series-parallel connection type. The tandem type has the advantages of simple structure, easy control and the like, but has the defects of low efficiency and high cost; the parallel connection type has good oil saving effect, but has higher requirements on parts such as an engine, a transmission and the like and more complex control process. The series-parallel hybrid electric vehicle has the characteristics of series connection and parallel connection, so that more possible control methods and extension schemes are provided.

The hybrid power automobile on the market at present has two types of double-motor configuration schemes with a planetary gear mechanism and double-clutch multi-gear motor configuration schemes, but most of parts of the two types of power system configurations are arranged at the front cabin of an engine of the automobile, the schemes belong to front-engine driving, although the hybrid power function can be realized, the hybrid power automobile does not have the function of four-wheel driving.

Disclosure of Invention

The invention aims to provide a series-parallel hybrid vehicle power system configuration and a control method, so as to realize four-wheel drive of a vehicle.

As the conception, the technical scheme adopted by the invention is as follows:

a series-parallel hybrid vehicle powertrain configuration comprising:

the engine is connected with the BSG motor in a transmission way, the engine is connected with the gearbox through a first clutch, and the output end of the gearbox is connected with the front wheel through a first transmission mechanism;

the main motor is connected to the rear wheel through a second clutch and a second transmission mechanism;

and the power battery is connected with the main motor and the BSG motor and used for supplying power to the main motor and the BSG motor.

And the system controller is electrically connected with the engine, the main motor, the BSG motor, the power battery and the gearbox respectively.

In order to achieve the above object, the present invention further provides a control method of the above series-parallel hybrid vehicle power system configuration, including: when the current speed of the vehicle is zero, the engine is in a stop state, the system controller detects the SOC of the power battery after the system controller collects a vehicle starting command, and when the SOC is greater than a first preset value, the system controller controls the main motor to work and controls the second clutch to be in a closed state, and the first preset value is greater than 0 and smaller than 1.

Further, still include: when the current speed of the vehicle is zero, the engine is in a shutdown state, the system controller detects the SOC of the power battery after the system controller collects a vehicle starting instruction, and when the SOC is greater than the first preset value, the system controller controls the engine to work, controls the first clutch to be in a slipping state, controls the main motor to work and controls the second clutch to be in a closed state.

Further, still include: when the current speed of a vehicle is zero and the engine is in a stop state, after the system controller acquires an instruction for starting the engine, the system controller detects the SOC of the power battery, and when the SOC is greater than a first preset value, the system controller controls the BSG motor to work so as to drive the engine to rotate until the rotating speed of the engine reaches a preset rotating speed, so that the engine is started, and in the process, the system controller controls the first clutch to be in a disconnection state.

Further, still include: when the current speed of the vehicle is zero, the engine is in a working state, and the gear shift lever is in a P or N gear, the system controller detects the SOC of the power battery, and when the SOC is smaller than or equal to the first preset value, the system controller controls the engine to drive the BSG motor to charge the power battery, and in the process, the system controller controls the first clutch to be in a disconnected state.

Further, still include: when the vehicle is in a running state, after the system controller collects an acceleration instruction, the system controller collects the current speed and the SOC of the power battery, and when the current speed of the vehicle is smaller than a first preset speed and the SOC is smaller than or equal to the first preset value, the system controller controls the main motor to work and control the second clutch to be in a closed state, the first clutch is controlled to be in an open state, and the BSG motor and the engine work to charge the power battery.

Further, still include: when the vehicle is in a running state, after a system controller acquires an acceleration instruction, the system controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is greater than or equal to the first preset speed and the SOC is greater than the first preset value, the system controller controls the engine to work, controls the main motor to work, and controls the first clutch and the second clutch to be in a closed state.

Further, still include: when the vehicle is in a running state, the engine is in a working state, after a system controller acquires an acceleration instruction, the system controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is greater than or equal to a first preset speed and the SOC is less than or equal to a first preset value, the system controller controls the engine to increase the rotating speed, controls the first clutch to be in a closed state, controls the main motor to stop, and controls the second clutch to be in an open state.

Further, still include: when a vehicle is in a running state, after a system controller acquires an acceleration instruction, the controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is lower than the first preset speed, and the SOC is higher than the first preset value and lower than a second preset value, the system controller controls the engine and the BSG motor to work, charges the power battery, controls the main motor to work, and controls the first clutch and the second clutch to be in a closed state;

the second preset value is larger than the first preset value, and the second preset value is smaller than 1.

Further, still include: when the vehicle is in a braking state, the system controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is greater than a second preset speed and less than a first preset speed and the SOC is less than a second preset value, the system controller controls the engine and the BSG motor to stop, controls the first clutch to be in an open state, controls the second clutch to be in a closed state, and controls the main motor to recover braking energy and charge the power battery;

the second preset speed is less than the first preset speed.

The invention has the beneficial effects that:

according to the configuration and the control method of the series-parallel hybrid electric vehicle power system, the system controller, the power battery, the main motor, the BSG motor, the engine, the first clutch and the second clutch are arranged, compared with the prior art, the single pure electric rear-drive function can be realized through the main motor, the front-drive function is realized through the BSG motor and the engine, the four-drive function is realized through the BSG motor, the engine and the main motor, the power battery can be charged, the braking energy can be recycled, and the emission reduction is realized while the oil is saved.

Drawings

FIG. 1 is a schematic diagram of a series-parallel hybrid electric vehicle powertrain configuration provided by the present invention.

In the figure:

1. a system controller; 2. a power battery; 3. a main motor; 4. a BSG motor; 5. an engine; 6. a gearbox; 71. a first clutch; 72. a second clutch; 81. a first inverter; 82. a second inverter.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, the present embodiment provides a series-parallel hybrid vehicle powertrain configuration including an engine 5, a BSG (Belt-drive starter generator) motor 4, a main motor 3, a power battery 2, and a system controller 1. The rotor shaft of the BSG motor 4 is connected with the front end of a crankshaft of the engine 5 through a front engine gear train belt, so that the BSG motor 4 is in transmission connection with the engine 5, the output end of the crankshaft of the engine 5 is connected with the first clutch 71, the first clutch 71 is connected with the input end of the gearbox 6, the output end of the gearbox 6 is connected with front wheels through a first transmission mechanism, specifically, the first transmission mechanism comprises a speed reducer and a differential mechanism, and the output end of the gearbox 6 transmits power of the engine 5 to the front wheels through the speed reducer and the differential mechanism. The main motor 3 is connected to the rear wheels through a second clutch 72 and a second transmission structure, specifically, an output shaft of the main motor 3 is connected to the second clutch 72, the second clutch 72 is connected to the second transmission structure, the second transmission structure also includes a speed reducer and a differential, and the second clutch 72 transmits the power of the main motor 3 to the rear wheels through the speed reducer and the differential. The power battery 2 is respectively connected with the main motor 3 and the BSG motor 4, the main motor 3 and the BSG motor 4 can be powered, and meanwhile, the BSG motor 4 can also charge the power battery 2. The system controller 1 is electrically connected with the engine 5, the main motor 3, the BSG motor 4, the power battery 2 and the gearbox 6 respectively. In this embodiment, the system controller 1 is a vehicle controller, and the vehicle controller is in communication connection with the engine system controller, the main motor controller, the battery management system and the transmission controller through CAN signals, respectively, so as to control the engine 5, the main motor 3, the BSG motor 4, the power battery 2 and the transmission 6.

In addition, the configuration of the series-parallel hybrid vehicle power system further includes two inverters, which are defined as a first inverter 81 and a second inverter 82, respectively, where the first inverter 81 is connected between the power battery 2 and the BSG motor 4, and the second inverter 82 is connected between the power battery 2 and the main motor 3, and the structure and the operation principle of the inverters are the prior art, and are not described in detail herein.

The system controller 1 can collect the electric quantity of the power battery 2 and the current speed of the vehicle, and the detection of the current speed can be measured by a speed sensor arranged in the vehicle. The power battery 2 is provided with a voltage detection module, and the voltage detection module can feed back the real-time electric quantity of the power battery 2 to the system controller 1, so that the system controller 1 can obtain the SOC (State of Charge) of the power battery 2, the value range of the SOC is 0-100%, and when the SOC is 1, the power battery 2 is in a full Charge State.

The embodiment also provides a control method of the power system configuration of the series-parallel hybrid vehicle, which comprises the following steps:

1. when the current speed of the vehicle is zero and the engine 5 is in a shutdown state, after the system controller 1 acquires a command for starting the vehicle, the system controller 1 detects the SOC of the power battery 2, and when the SOC is greater than a first preset value, the system controller 1 controls the main motor 3 to operate and controls the second clutch 72 to be in a closed state, and the first preset value is less than 1.

Specifically, when the vehicle is in a parking state, the current vehicle speed of the vehicle is zero, and the engine 5 is in a stop state, at which time if the vehicle is to be started, the driver shifts the shift lever from the P or N gear to the D or R gear, and when the brake pedal is released and the accelerator pedal is depressed, the system controller 1 acquires an instruction for vehicle start, then detects the SOC of the power battery 2, and when the SOC is larger than the first preset value, the electric quantity of the power battery 2 meets the pure electric starting requirement of the vehicle, the system controller 1 thus controls the operation of the main motor 3, controls the second clutch 72 to be in the closed state, so that the main motor 3 drives the rear wheels to rotate through the second clutch 72 and the second transmission structure, in the process, the BSG motor 4 and the engine 5 do not work, and the first clutch 71 is in a disconnected state, so that the pure electric rear-drive starting of the vehicle is realized.

The adhesion of the rear wheel is sufficient, and it can be understood that the friction between the rear wheel and the ground is sufficiently large. The first preset value can be set according to the type of the power battery 2, and is, for example, 20% in the present embodiment.

2. When the current speed of the vehicle is zero, the engine 5 is in a shutdown state, after the system controller 1 acquires a command of starting the vehicle, the system controller 1 detects the SOC of the power battery 2, and when the SOC is greater than a first preset value, the system controller 1 controls the main motor 3 to operate, controls the engine 5 to operate, controls the first clutch 71 to be in a slip state, and controls the second clutch 72 to be in a closed state.

Specifically, when the vehicle is in a parking state, the current vehicle speed of the vehicle is zero, the engine 5 is in a shutdown state, at this time, if vehicle starting is to be achieved, a driver moves a gear lever from a P gear or an N gear to a D gear or an R gear, and releases a brake pedal and presses an accelerator pedal, the system controller 1 acquires a vehicle starting instruction, then detects the SOC of the power battery 2, and when the SOC is greater than a first preset value, it is indicated that the electric quantity of the power battery 2 at this time meets the starting requirement of the vehicle, at this time, the system controller 1 controls the BSG motor 4 to work to drive the engine 5 to rotate, after the engine 5 starts, the engine 5 is controlled to work, and the first clutch 71 is controlled to be in a slipping state, at this time, the BSG motor 4 does not work, and rotates synchronously with the engine 5. Meanwhile, the system controller 1 controls the main motor 3 to work and controls the second clutch 72 to be in a closed state, so that four-wheel drive starting of the vehicle is realized.

The above process is suitable for the situation that the adhesion force of the front wheels and the adhesion force of the rear wheels are relatively insufficient, for example, when the vehicle is on a wet and slippery road surface, the friction force between the front wheels and the ground and the friction force between the rear wheels and the ground are relatively small, but the process is not limited to the process, and a driver can freely select the rear-drive starting or the four-drive starting.

3. When the current speed of the vehicle is zero, the engine 5 is in a shutdown state, after the system controller 1 acquires an instruction for starting the engine, the system controller 1 detects the SOC of the power battery 2, and when the SOC is greater than a first preset value, the system controller 1 controls the BSG motor 4 to work to drive the engine 5 to rotate until the rotating speed of the engine 5 reaches a preset rotating speed, so as to start the engine 5, wherein the first clutch 71 is in a disconnection state in the process.

Specifically, when the vehicle is in a parking state, the current vehicle speed of the vehicle is zero, the gear shift lever is in a P or N gear, at this time, if the engine is to be started, the driver shifts the gear shift lever from the P or N gear to a D or R gear, after the system controller 1 acquires a signal that the gear shift lever is shifted from the P or N gear to the D or R gear, the system controller 1 first detects the SOC of the power battery 2, and when the SOC is greater than a first preset value, it indicates that the electric quantity of the power battery 2 at this time meets the starting requirement of the engine 5, so the system controller 1 controls the BSG motor 4 to operate, so as to drive the engine 5 to rotate until the rotation speed of the engine 5 reaches a preset rotation speed, so as to start the engine 5, during which the first clutch 71 is not operated, and the main motor 3 and the second clutch 72 are also in an off state.

The process is suitable for the condition that the engine is adopted to drive the front wheels to start the vehicle, the system controller 1 is required to detect the power of the BSG motor 4 at first, and the BSG motor 4 drives the engine 5 to rotate under the condition that the power of the BSG motor 4 is larger than the preset power so as to start the engine 5, wherein the preset power is determined according to the type of the BSG motor 4 and the type of the engine 5.

4. When the current speed of the vehicle is zero, the engine 5 is in a working state, and the gear shift lever is in a P or N gear, the system controller 1 detects the SOC of the power battery 2, and when the SOC is less than or equal to a first preset value, the system controller 1 controls the engine 5 to drive the BSG motor 4 to charge the power battery 2, and in the process, the system controller 1 controls the first clutch 71 to be in a disconnected state.

Specifically, when the current vehicle speed of the vehicle is zero and the engine 5 is in the operating state, the shift lever is in the P or N gear, which indicates that the engine 5 is already in the starting state, and at this time, the system controller 1 detects the SOC of the power battery 2, and when the SOC is less than or equal to the first preset value, which indicates that the electric quantity of the power battery 2 is relatively small at this time, the electric quantity requirement of the next start of the engine 1 cannot be met, so the system controller 1 controls the engine 5 to drive the BSG motor 4 to rotate, and charges the power battery 2 through the BSG motor 4, during which the first clutch 71 is in the off state, the main motor 3 does not work, and the second clutch 72 is also in the off state. At this time, it can be understood that, when the engine 5 is in the operating state, the power battery 2 stops supplying power to the BSG motor 4, and the BSG motor 4 rotates to generate power under the driving of the engine 5, so as to charge the power battery 2.

5. When the vehicle is in a running state, after the system controller 1 acquires an acceleration instruction, the system controller 1 acquires the current vehicle speed and the SOC of the power battery 2, and when the current vehicle speed of the vehicle is less than a preset speed and the SOC is less than or equal to a first preset value, the system controller 1 controls the main motor 3 to operate, controls the second clutch 72 to be in a closed state, controls the first clutch 71 to be in an open state, and controls the BSG motor 4 and the engine 5 to operate to charge the power battery 2.

Specifically, when the vehicle is in a driving state, the shift lever is in a D or R gear, at this time, after the system controller 1 acquires an acceleration instruction, that is, when the accelerator pedal is further depressed, the system controller 1 detects the current vehicle speed of the vehicle and the SOC of the power battery 2, and when the current vehicle speed of the vehicle is less than a first preset speed and the SOC is less than or equal to a first preset value, it indicates that the electric quantity of the power battery 2 cannot meet the acceleration requirement of the vehicle, and because the current vehicle speed is relatively low, the torque output by the main motor 3 can meet the total torque requirement of the vehicle, at this time, the system controller 1 controls the engine 5 to operate, and drives the BSG motor 4 to charge the power battery 2, controls the main motor 3 to operate, and controls the first clutch 71 to be in an open state, controls the second clutch 72 to be in a closed state, that is, at this time, the engine 5 and the BSG motor 4 are in a series connection with the, drive BSG motor 4 through engine 5 and charge power battery 2, and power battery 2 provides the electric quantity so that main motor 3 can drive the rear wheel and rotate to the promotion that realizes the speed of a motor vehicle to main motor 3.

The preset speed can be set according to actual needs, and for example, in the embodiment, the first preset speed is 120 km/h. The above situation is applicable to the situation that the electric quantity of the power battery 2 cannot meet the driving requirement, but the maximum output torque of the main motor 3 can meet the total torque requirement of the vehicle, the front wheel adhesion coefficient is relatively small, and the rear wheel adhesion coefficient is relatively large.

6. When the vehicle is in a running state, after the system controller 1 acquires an acceleration instruction, the system controller 1 acquires the current vehicle speed and the SOC of the power battery 2, and when the current vehicle speed of the vehicle is greater than or equal to a first preset speed and the SOC is greater than the first preset value, the system controller 1 controls the engine 5 to operate, controls the main motor 3 to operate, and controls both the first clutch 71 and the second clutch 72 to be in a closed state.

Specifically, when the vehicle is in a driving state, the shift lever is in a D or R gear, and at this time, after the system controller 1 acquires an acceleration instruction, that is, when the accelerator pedal is further depressed, the system controller 1 detects the current vehicle speed of the vehicle and the SOC of the power battery 2, and when the current vehicle speed of the vehicle is greater than or equal to a first preset speed and the SOC is greater than a first preset value, it indicates that the electric quantity of the power battery 2 can meet the acceleration requirement of the vehicle, but because the current vehicle speed is greater than the preset speed, the single-shaft driving output torque of the main motor 3 is insufficient or the total driving torque requirement of the vehicle is greater than the peak output torque of the main motor 3, then the input of the engine 5 is required to output the torque, so that the system controller 1 controls the engine 5 to operate, the BSG motor 4 rotates synchronously with the engine 5, controls the main motor 3 to operate, and controls both the first clutch 71 and the second clutch 72 to be in, that is, the engine 5 and the BSG motor 4 are in parallel with the main motor 3 at this time, and the vehicle speed is increased by driving the front wheels and the rear wheels at the same time. At this time, the BSG motor 4 rotates with the engine 5, and can charge the power battery 2.

7. When the vehicle is in a running state, the engine 5 is in a working state, after the system controller 1 acquires an acceleration instruction, the system controller 1 acquires the current vehicle speed and the SOC of the power battery 2, and when the current vehicle speed of the vehicle is greater than or equal to a first preset speed and the SOC of the power battery 2 is less than or equal to the first preset value, the system controller 1 controls the engine 5 to increase the rotating speed, controls the first clutch 71 to be in a closed state, controls the main motor 3 to stop, and controls the second clutch 72 to be in an open state.

Specifically, when the vehicle is in a running state, the shift lever is in the D or R range, the engine 5 is in an operating state, when the system controller 1 acquires the acceleration instruction, the system controller 1 acquires the current speed measurement and the SOC of the power battery 2, and when the current speed of the vehicle is higher than the first preset speed and the SOC of the power battery 2 is less than or equal to the first preset value, it indicates that the electric quantity of the power battery 2 can not meet the requirement of acceleration driving, since the engine 5 is already in the operating state, and the operating efficiency of the engine 5 is within the efficient operating region of the engine efficiency characteristic curve, the system controller 1 controls the engine 5 to operate, the rotation speed is increased, the first clutch 71 is controlled to be in the closed state, the main motor 3 is controlled to stop, the second clutch 72 is controlled to be in the open state, and the vehicle is driven only by the engine 5.

At this time, the BSG motor 4 rotates synchronously with the engine 5 to generate power, and charges the power battery 2.

8. When the vehicle is in a running state, after the system controller 1 acquires an acceleration instruction, the system controller 1 acquires the current vehicle speed and the SOC of the power battery 2, and when the current vehicle speed of the vehicle is less than a first preset speed, and the SOC is greater than a first preset value and less than a second preset value, the system controller 1 controls the engine 5 to operate, drives the BSG motor 4 to operate, charges the power battery 2, controls the main motor 3 to operate, and controls the first clutch 71 and the second clutch 72 to be in a closed state.

Specifically, when the vehicle is in a driving state, the shift lever is in a D or R gear, after the system controller 1 acquires an acceleration instruction, the system controller 1 acquires a current vehicle speed and an SOC of the power battery 2, and when the current vehicle speed of the vehicle is less than a first preset speed, and the SOC is greater than a first preset value and less than a second preset value, the system controller 1 determines that the power battery 2 needs to be charged, so as to meet the next start-up of the engine 5, at this time, the system controller 1 controls the engine 5 to operate, drives the BSG motor 4 to rotate to generate power, charges the power battery 2, and controls the main motor 3 to operate, and the first clutch 71 and the second clutch 72 are both closed, it can be understood that at this time, the engine 5 and the BSG motor 4 are in a parallel state with the main motor 3, and drives the front wheels and the rear wheels to achieve the increase of the vehicle speed.

The second preset value can be set according to actual needs, and the second preset value is greater than the first preset value and less than 1, for example, in this embodiment, the second preset value is 95%.

9. When the vehicle is in a braking state, the system controller 1 acquires the current vehicle speed and the SOC of the power battery 2, and when the current vehicle speed of the vehicle is greater than a second preset speed and less than a first preset speed, and the SOC is less than a second preset value, the system controller 1 controls the engine 5 and the BSG motor 4 to stop, controls the first clutch 71 to be in an open state, controls the second clutch 72 to be in a closed state, controls the main motor 3 to recover braking energy and charge the power battery 2, and the second preset speed is less than the first preset speed.

Specifically, when a driver steps on a brake pedal, a gear shift lever is located in a D gear or an R gear, and a vehicle is in a braking state, a system controller 1 acquires a current vehicle speed and an SOC of a power battery 2, and when the current vehicle speed of the vehicle is greater than a second preset speed and less than a first preset speed, and the SOC is less than a second preset value, it is indicated that the electric quantity of the power battery 2 is not in a full-charge state at the moment, the power battery 2 can be charged, the braking power of a main motor 3 meets the braking energy recovery requirement, the hybrid vehicle power system configuration performs braking energy recovery, the system controller 1 controls an engine 5 and a BSG motor 4 to stop, controls a first clutch 71 to be in an open state, controls a second clutch 72 to be in a closed state, and controls the main motor 3 to recover the braking energy and charge the power battery 2.

The second preset speed can be set according to actual needs, and is exemplarily 15km/h in the present embodiment.

In summary, according to the configuration and the control method of the series-parallel hybrid vehicle power system provided by the embodiment, by arranging the system controller 1, the power battery 2, the main motor 3, the BSG motor 4, the engine 5, the transmission 6, the first clutch 71 and the second clutch 72, compared with the prior art, a pure electric rear drive function can be realized through the main motor 3, a front drive function can be realized through the BSG motor 4 and the engine 5, a four-drive function can be realized through the BSG motor 4, the engine 5 and the main motor 3, the power battery 2 can be charged, braking energy can be recovered, and emission reduction is realized while saving oil.

In addition, the series-parallel hybrid vehicle power system configuration provided by the embodiment can realize modularization and platform development, the mixing of the power system is easy to realize, and during the development, the power system on the traditional vehicle can cancel a starter, an air conditioner compressor of an engine front-end gear train and a 12V generator which are attached to an engine 5, and the BSG motor 4 is used for replacing to realize corresponding functions, and meanwhile, the main motor 3 is added to improve the comprehensive performance of the whole vehicle. And the hybrid power function under different modes can be realized on the basis of less structural change and less cost increase of the traditional vehicle.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A series-parallel hybrid vehicle powertrain configuration, comprising:

the automobile front wheel brake system comprises an engine (5) and a BSG motor (4), wherein the BSG motor (4) is in transmission connection with the engine (5), the engine (5) is connected to a gearbox (6) through a first clutch (71), and the output end of the gearbox (6) is connected to a front wheel through a first transmission mechanism;

the main motor (3) is connected to the rear wheels through a second clutch (72) and a second transmission mechanism;

the power battery (2) is connected with the main motor (3) and the BSG motor (4) and is used for supplying power to the main motor (3) and the BSG motor (4);

and the system controller (1) is electrically connected with the engine (5), the main motor (3), the BSG motor (4), the power battery (2) and the gearbox (6) respectively.

2. A control method of a series-parallel hybrid vehicle powertrain configuration of claim 1, characterized by comprising: when the current speed of the vehicle is zero, the engine is in a stop state, the system controller detects the SOC of the power battery after the system controller collects a vehicle starting command, and when the SOC is greater than a first preset value, the system controller controls the main motor to work and controls the second clutch to be in a closed state, and the first preset value is greater than 0 and smaller than 1.

3. The control method of the series-parallel hybrid vehicle powertrain configuration of claim 2, characterized by further comprising: when the current speed of the vehicle is zero, the engine is in a shutdown state, the system controller detects the SOC of the power battery after the system controller collects a vehicle starting instruction, and when the SOC is greater than the first preset value, the system controller controls the engine to work, controls the first clutch to be in a slipping state, controls the main motor to work and controls the second clutch to be in a closed state.

4. The control method of the series-parallel hybrid vehicle powertrain configuration of claim 2, characterized by further comprising: when the current speed of a vehicle is zero and the engine is in a stop state, after the system controller acquires an instruction for starting the engine, the system controller detects the SOC of the power battery, and when the SOC is greater than a first preset value, the system controller controls the BSG motor to work so as to drive the engine to rotate until the rotating speed of the engine reaches a preset rotating speed, so that the engine is started, and in the process, the system controller controls the first clutch to be in a disconnection state.

5. The control method of the series-parallel hybrid vehicle powertrain configuration of claim 2, characterized by further comprising: when the current speed of the vehicle is zero, the engine is in a working state, and the gear shift lever is in a P or N gear, the system controller detects the SOC of the power battery, and when the SOC is smaller than or equal to the first preset value, the system controller controls the engine to drive the BSG motor to charge the power battery, and in the process, the system controller controls the first clutch to be in a disconnected state.

6. The control method of the series-parallel hybrid vehicle powertrain configuration of claim 2, characterized by further comprising: when the vehicle is in a running state, after the system controller collects an acceleration instruction, the system controller collects the current speed and the SOC of the power battery, and when the current speed of the vehicle is smaller than a first preset speed and the SOC is smaller than or equal to the first preset value, the system controller controls the main motor to work and control the second clutch to be in a closed state, the first clutch is controlled to be in an open state, and the BSG motor and the engine work to charge the power battery.

7. The control method of the series-parallel hybrid vehicle powertrain configuration of claim 6, characterized by further comprising: when the vehicle is in a running state, after a system controller acquires an acceleration instruction, the system controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is greater than or equal to the first preset speed and the SOC is greater than the first preset value, the system controller controls the engine to work, controls the main motor to work, and controls the first clutch and the second clutch to be in a closed state.

8. The control method of the series-parallel hybrid vehicle powertrain configuration of claim 7, characterized by further comprising: when the vehicle is in a running state, the engine is in a working state, after a system controller acquires an acceleration instruction, the system controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is greater than or equal to a first preset speed and the SOC is less than or equal to a first preset value, the system controller controls the engine to increase the rotating speed, controls the first clutch to be in a closed state, controls the main motor to stop, and controls the second clutch to be in an open state.

9. The control method of the series-parallel hybrid vehicle powertrain configuration according to any one of claims 6 to 8, characterized by further comprising: when a vehicle is in a running state, after a system controller acquires an acceleration instruction, the controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is lower than the first preset speed, and the SOC is higher than the first preset value and lower than a second preset value, the system controller controls the engine and the BSG motor to work, charges the power battery, controls the main motor to work, and controls the first clutch and the second clutch to be in a closed state;

10. The control method of the series-parallel hybrid vehicle powertrain configuration of claim 9, characterized by further comprising: when the vehicle is in a braking state, the system controller acquires the current speed and the SOC of the power battery, and when the current speed of the vehicle is greater than a second preset speed and less than a first preset speed and the SOC is less than a second preset value, the system controller controls the engine and the BSG motor to stop, controls the first clutch to be in an open state, controls the second clutch to be in a closed state, and controls the main motor to recover braking energy and charge the power battery;

the second preset speed is less than the first preset speed.