CN111605395A - A hybrid power system and control method - Google Patents

Abstract

The invention discloses a hybrid power system and a control method. The hybrid power system comprises an engine; a first motor; a second motor; a parallel shaft gearbox, which has a first input shaft and a second input shaft arranged in parallel in its box One end of the first input shaft is connected to the first motor, the other end is connected to the engine through the clutch, and one end of the second input shaft is connected to the second motor. The invention optimizes the synergistic effect of the engine and the motor by providing a hybrid power system with dual motors and an engine, improves the working efficiency of the system, and avoids the problem of low driving efficiency of the engine during vehicle starting and low-speed running.

Description

A hybrid power system and control method

technical field

The invention relates to the technical field of hybrid power, in particular to a hybrid power system and a control method.

Background technique

New energy vehicles are developing rapidly in the industry due to their energy saving and environmental protection features. Hybrid electric vehicles, as an important branch of new energy vehicles, on the basis of retaining traditional engines, give full play to the advantages of motors and greatly improve vehicle fuel economy and emissions. sex. Hybrid electric vehicles have price advantages and endurance advantages that pure electric vehicles do not have. Therefore, the development and promotion of hybrid electric systems is imperative. As one of the key technologies of the hybrid power system, the power coupling system has been studied all the time, but there are few breakthroughs in the domestic research lacking the technical basis of the automatic transmission. The existing hybrid system mostly adopts the coaxial arrangement of the single motor integrated with the automatic transmission, the motor is difficult to take into account the functions of driving, speed regulation and power generation, and the structural arrangement is also very difficult; The working conditions are limited, and the medium and low speed stages are completely driven by electric motors, from fuel power generation to electric drive, resulting in loss of efficiency and unsatisfactory fuel-saving effect.

Therefore, a hybrid vehicle needs a hybrid drive system with a dual-motor pure electric drive function, which can give full play to the high efficiency of the motor in the low-speed state of the vehicle and the high efficiency of the engine in the medium and high-speed state of the vehicle. The speed change allows the engine to connect to the drive earlier, avoids the efficiency loss caused by the vehicle still running in series mode under the high-efficiency engine condition, and allows both the motor and the engine to work in the high-efficiency area as much as possible, thereby improving the system efficiency. At the same time, there is no power interruption during the transmission shifting process, and the driving comfort is good.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hybrid power system and a control method to solve the above-mentioned problems in the background art.

To achieve the above object, the present invention provides the following technical solutions: a hybrid power system, comprising:

engine;

motor one;

motor two;

The parallel shaft gearbox has a first input shaft, a second input shaft and an output shaft arranged in parallel in its box. One end of the first input shaft is connected to the motor one, and the other end is connected to the engine through a clutch. The second input shaft is connected to the engine. One end of the input shaft is connected to the second motor.

The output shaft is connected with a differential, the differential is provided with a differential external gear, the first input shaft is provided with a first input shaft driving gear, and the first input shaft driving gear is connected to the differential. The differential external gear is constantly meshed, the second input shaft is provided with a second input shaft driving gear, and the second input shaft driving gear is constantly meshed with the differential external gear.

The first input shaft driving gear includes a first-speed driving gear and a second-speed driving gear;

A first input shaft synchronizer is arranged between the first-speed driving gear and the second-speed driving gear, and the first-speed driving gear or the second-speed driving gear is coupled or decoupled from the first input shaft through the first input shaft synchronizer. coupled.

The second input shaft is provided with a second input shaft synchronizer, and the second input shaft driving gear is coupled or decoupled from the second input shaft through the second input shaft synchronizer.

The first input shaft is provided with a first input shaft synchronizer, and the first input shaft driving gear is coupled or decoupled from the first input shaft through the first input shaft synchronizer.

The differential external gear includes a differential external gear 1 and a differential external gear 2;

The first-speed driving gear is constantly meshed with the external gear of the differential, the second-speed driving gear is constantly meshed with the external gear of the differential, and the gear position of the first input shaft is controlled by the first input shaft synchronizer , and coupling or decoupling from the output shaft.

The differential external gear includes a differential external gear 1 and a differential external gear 2;

The second input shaft driving gear is in constant mesh with the differential external gear, the second input shaft is controlled by the second input shaft synchronizer to control its gear position, and is coupled or decoupled from the output shaft.

A control method for a hybrid power system, the hybrid power system includes three power transmission states, which are a pure electric power transmission state, a series hybrid power transmission state and a parallel hybrid power transmission state;

The pure electric power transmission state includes the following control steps:

Step 1: The clutch is disconnected and the engine is turned off;

Step 2: The hybrid system is driven by the second motor as the main drive unit. At this time, the second input shaft synchronizer meshes with the second input shaft driving gear, and the output torque of the second motor is driven by the external gear of the differential. The meshed second input shaft driving gear is transmitted to the output shaft;

Step 3: According to the power demand of the hybrid power system, determine whether or not the first motor participates in the auxiliary drive;

If so, the first input shaft synchronizer meshes with the first input shaft driving gear, and the torque is transmitted to the output shaft through the differential external gear through the first input shaft driving gear;

If not, the first input shaft synchronizer is in the neutral position, at this time, the first input shaft driving gear is idling, and the motor does not participate in the auxiliary drive.

The series hybrid power transmission state includes the following control steps:

Step 1: The first motor is used as a generator, and at the same time, the hybrid system is driven by the second motor as a drive unit;

Step 2: When the motor 1 is used as a generator, the first input shaft synchronizer is decoupled from the first input shaft driving gear, and at the same time, the engine is started and combined with the clutch, the motor 1 is driven by the engine through the first input The synchronous rotation of the shaft generates electricity;

When the second motor is used as the driving unit, the second input shaft synchronizer meshes with the second input shaft drive gear, and the second input shaft transmits torque to the output through the second input shaft drive gear and the differential external gear axis.

The parallel hybrid power transmission state includes the following control steps:

Step 1: The clutch is in the engaged state and the engine is started;

Step 2: The hybrid system is driven by the engine as the main drive unit. At this time, the first input shaft synchronizer is coupled with the first input shaft driving gear, and the first input shaft is driven by the first input shaft driving gear and differential external gear to transmit torque to the output shaft;

Step 3: According to the power demand of the hybrid system, determine whether or not the second motor is involved in the auxiliary drive;

If so, the second input shaft synchronizer meshes with the second input shaft driving gear, and the torque is transmitted to the output shaft through the differential external gear through the second input shaft driving gear;

If not, the second input shaft synchronizer is in the neutral position, at this time, the second input shaft driving gear is idling, and the second motor does not participate in the auxiliary drive.

In the pure electric power transmission state, the step of judging whether or not the first motor participates in the auxiliary drive includes:

Confirm whether or not to participate in auxiliary drive;

If so, the first input shaft synchronizer meshes with the first-speed driving gear, and the first-speed driving gear is coupled with the first input shaft through the first input shaft synchronizer. At this time, the first-speed driving gear will The torque of the first input shaft is transmitted to the output shaft through the external gear of the differential gear which is constantly meshed with it;

Or, the first input shaft synchronizer meshes with the second-speed driving gear, and the second-speed driving gear is coupled with the first input shaft through the first input shaft synchronizer. At this time, the second-speed driving gear will The torque of the first input shaft is transmitted to the output shaft through the second differential external gear which is constantly meshed with it;

If not, the first input shaft synchronizer is in the neutral position, at this time, the first-speed driving gear and the second-speed driving gear are both idling, and the motor 1 does not participate in auxiliary driving.

In the series hybrid power transmission state, the first step when the electric machine acts as a generator includes:

Both the first driving gear and the second gear are idling. At this time, the first input shaft synchronizer is decoupled from the first input shaft, and at the same time, the engine is started and combined with the clutch. The motor is driven by the engine. Electricity is generated by the synchronous rotation of the first input shaft.

In the parallel hybrid power transmission state, the step that the hybrid power system is driven by the engine as the main drive unit includes:

the first input shaft synchronizer is coupled with the first driving gear, and the first input shaft transmits torque to the output shaft through the first driving gear and the differential external gear;

Or, the first input shaft synchronizer is coupled with the second driving gear, and the first input shaft transmits torque to the output shaft through the second driving gear and the second differential external gear.

In the second step in the parallel hybrid transmission state, when the hybrid power system is driven by the engine as the driving unit, and according to the power demand of the hybrid power system, it is determined whether the first motor is involved in auxiliary driving, power generation or idling, and includes the following steps:

If participating in driving, the engine is linked with the motor one through the first input shaft, and at this time, the motor one transmits the torque to the output shaft through the first input shaft;

If participating in power generation, the engine is connected to the motor 1 through the first input shaft, and at this time, the motor 1 generates electricity through the first input shaft;

If idling, the engine is connected to the first motor through the first input shaft, and at the same time, the first motor is idling.

The hybrid power system is provided with a braking energy recovery system, and the braking energy recovery system performs braking energy recovery by converting the first and second motors participating in the driving from a driving state to a power generating state.

It can be seen from the above technical solutions that the present invention optimizes the synergistic effect of the engine and the motor by providing a hybrid power system with dual motors and an engine, improves the working efficiency of the system, and avoids the low driving efficiency of the engine during vehicle starting and low-speed driving. The problem is specifically:

The present invention has a simple structure, the first motor and the second motor are arranged in parallel, and the axial dimension is short, which can well meet the space requirements of the vehicle axial arrangement; The power drive unit performs power compensation, so that the power is not interrupted when shifting, and the problem of shifting power interruption is solved.

The motor provides driving force for starting and low-speed driving. In the medium and high-speed conditions of the vehicle, the engine directly drives the vehicle, and always keeps the engine running in a stable condition, and provides kinetic energy compensation for the vehicle, effectively improving this kind of hybrid power. performance of the system.

Description of drawings

FIG. 1 is a schematic diagram of the system of the present invention.

In the picture: 1 clutch, 2 first gear driving gear, 3 second gear driving gear, 4 first input shaft, 5 first input shaft synchronizer, 6 differential external gear 1, 7 differential external gear 2, 8 output shaft, 9 second input shaft drive gear, 10 second input shaft synchronizer, 11 second input shaft, 12 engine, 13 motor one, 14 motor two.

Detailed ways

Hereinafter, specific embodiments of the hybrid power system and the control method of the hybrid power system of the present invention will be described in detail with reference to the accompanying drawings.

According to an embodiment of the present invention, a hybrid power system is provided, which includes an engine 12; a motor one 13; a motor two 14; The input shaft 4, the second input shaft 11 and the output shaft 8, one end of the first input shaft 4 is connected to the motor one 13, the other end is connected to the engine 14 through the clutch 1, and one end of the second input shaft 11 is connected to the motor two 14. In this embodiment, whether the engine 12 is coaxially connected to the motor one 13 through the clutch 1 or not, that is, when the clutch 1 is in a combined state, the engine 12 is connected to the first input shaft 4 and rotates, and the motor one 13 and the motor one The second motor 14 realizes whether it transmits the output torque to the output shaft 8 through the parallel shaft transmission.

At the same time, the motor one 13 used in the present invention is directly connected to the first input shaft 4, and an intermediate shaft and a pair of gears can also be added to be connected to the first input shaft 4 by adding a first stage of deceleration.

In this embodiment, the output shaft 8 is connected with a differential, the differential is provided with a differential external gear, the first input shaft 4 is provided with a first input shaft driving gear, and the first input shaft An input shaft driving gear is constantly meshed with the differential external gear, the second input shaft 11 is provided with a second input shaft driving gear 9, and the second input shaft driving gear 9 is constantly meshed with the differential external gear. In practice, the following relationship exists between the engine 12 , the first motor 13 , the second motor 11 and the output shaft 8 :

one:

When the clutch 1 is in the engaged state, the engine 12 is connected to the motor one 13 through the first input shaft 4, and the following relationships exist at this time, which are:

(1): The first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first input shaft main gear is sleeved on the first input shaft 4, and the first input shaft synchronizer 5 is connected to the first input shaft. When the shaft main gear is engaged, the first input shaft 4 at this time transmits the output torque of the engine 12 to the output shaft 8 .

(2): The first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first input shaft main gear is sleeved on the first input shaft 4, and the first input shaft synchronizer 5 is connected to the first input shaft. The shaft main gear is not meshed, and the first input shaft 4 at this time only transmits the output torque of the engine 12 to the motor one 13, and the motor one 13 can be used as a generator in practice.

two:

When the clutch 1 is in the disconnected state, the engine 12 is disconnected from the first input shaft 4, and the motor one 13 at this time has the following relationships, which are:

(1): the first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first input shaft main gear is sleeved on the first input shaft 4, and the first input shaft synchronizer 5 is connected to the first input shaft When the main gear of an input shaft is engaged, the first input shaft 4 at this time transmits the output torque of the motor one 13 to the output shaft 8 .

(2) The first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first input shaft main gear is sleeved on the first input shaft 4, the first input shaft synchronizer 5 is connected to the first input shaft The main gear is not meshed, and at this time, the first input shaft 4 has no output torque transmitted to the output shaft 8 .

three:

The second input shaft 11 is provided with a second input shaft synchronizer 10, and a second input shaft driving gear 9 is hollowly sleeved on the second input shaft 11. The second input shaft driving gear 9 passes through the second input shaft. The synchronizer 10 is coupled or decoupled from the second input shaft 11; at this time, the following relationship exists:

(1): When the second input shaft synchronizer 10 meshes with the second input shaft driving gear 9, the second input shaft 11 at this time transmits the output torque of the motor two 14 to the output shaft 8.

(2): When the second input shaft synchronizer 10 is not meshed with the second input shaft driving gear 9 , the second input shaft 11 at this time has no output torque transmitted to the output shaft 8 .

According to another embodiment of the present invention, a hybrid power system is provided, comprising an engine 12; a motor one 13; a motor two 14; An input shaft 4, a second input shaft 11 and an output shaft 8, one end of the first input shaft 4 is connected to the motor 13, the other end is connected to the engine 14 through the clutch 1, and one end of the second input shaft 11 is connected to the motor 214. In this embodiment, whether the engine 12 is coaxially connected to the motor one 13 through the clutch 1 or not, that is, when the clutch 1 is in a combined state, the engine 12 is connected to the first input shaft 4 and rotates, and the motor one 13 and the motor one The second motor 14 realizes whether it transmits the output torque to the output shaft 8 through the parallel shaft transmission.

In this embodiment, the output shaft 8 is connected with a differential, the differential is provided with a differential external gear, and the first input shaft 4 is provided with a first-speed driving gear 2 and a second-speed driving gear. 3. The second input shaft 11 is provided with a second input shaft driving gear 9, and the second input shaft driving gear 9 is in constant mesh with the external gear of the differential. A first input shaft synchronizer 5 is arranged between the first-speed driving gear 2 and the second-speed driving gear 3, and the first-speed driving gear 2 or the second-speed driving gear 3 communicates with the first input shaft synchronizer 5 through the first input shaft synchronizer 5. An input shaft 4 is coupled or decoupled. The differential external gear includes a differential external gear 1 6 and a differential external gear 2 7; the first-speed driving gear 2 is constantly meshed with the differential external gear 1 6, and the second-speed driving gear 3 Constantly meshing with the second differential gear 7 , the first input shaft 4 controls its gear position through the first input shaft synchronizer 5 , and is coupled or decoupled from the output shaft 8 . The second input shaft driving gear 9 is in constant mesh with the differential external gear 1 6 , the second input shaft 11 is controlled by the second input shaft synchronizer 10 to control its gear position, and is coupled or decoupled from the output shaft 8 . coupled.

In practice, the following relationship exists between the engine 12 , the first motor 13 , the second motor 11 and the output shaft 8 :

one:

When the clutch 1 is in the engaged state, the engine 12 is connected to the motor one 13 through the first input shaft 4, and the following relationships exist at this time, which are:

(1): the first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first-speed driving gear 2 and a second-speed driving gear 3 are sleeved on the first input shaft 4;

When the first input shaft synchronizer 5 meshes with the first-speed driving gear 2, the first input shaft 4 at this time transmits the output torque of the engine 12 to the output shaft 8 through the first-speed driving gear 2 and the differential external gear 1 6 ;

When the first input shaft synchronizer 5 meshes with the second-speed driving gear 3 , the first input shaft 4 at this time transmits the output torque of the engine 12 to the output shaft 8 through the second-speed driving gear 3 and the second differential external gear 7 .

(2): The first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first-speed driving gear 2 and a second-speed driving gear 3 are sleeved on the first input shaft 4, and the first input shaft synchronizer 5 It is not meshed with the first-speed driving gear 2 and the second-speed driving gear 3. At this time, the first input shaft 4 only transmits the output torque of the engine 12 to the motor one 13, which can be a generator in practice use.

two:

When the clutch 1 is in the disconnected state, the engine 12 is disconnected from the first input shaft 4, and the motor one 13 at this time has the following relationships, which are:

(1): the first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first-speed driving gear 2 and a second-speed driving gear 3 are sleeved on the first input shaft 4;

When the first input shaft synchronizer 5 meshes with the first gear drive gear 2, the first input shaft 4 at this time transmits the output torque of the motor one 13 to the output shaft through the first gear drive gear 2 and the differential external gear one 6 8;

When the first input shaft synchronizer 5 meshes with the second-speed driving gear 3, the first input shaft 4 at this time transmits the output torque of the motor one 13 to the output shaft through the second-speed driving gear 2 and the second differential external gear 7 8.

(2) The first input shaft 4 is provided with a first input shaft synchronizer 5, and at the same time, a first input shaft main gear is sleeved on the first input shaft 4, the first input shaft synchronizer 5 is connected to the first input shaft The main gear is not meshed, and at this time, the first input shaft 4 has no output torque transmitted to the output shaft 8 .

three:

The second input shaft 11 is provided with a second input shaft synchronizer 10, and a second input shaft driving gear 9 is hollowly sleeved on the second input shaft 11. The second input shaft driving gear 9 passes through the second input shaft. The synchronizer 10 is coupled or decoupled from the second input shaft 11; at this time, the following relationship exists:

(1): When the second input shaft synchronizer 10 meshes with the second input shaft drive gear 9, the second input shaft 11 at this time passes the output torque of the second motor 14 through the second input drive gear 9 and the differential Gear one 6 is transmitted to the output shaft 8 .

(2): When the second input shaft synchronizer 10 is not meshed with the second input shaft driving gear 9 , the second input shaft 11 at this time has no output torque transmitted to the output shaft 8 .

Compared with the previous embodiment, this embodiment adopts a parallel shaft gearbox with a two-speed structure. The speed change allows the engine to be connected to the drive earlier, avoiding the efficiency loss caused by the high-efficiency engine of the vehicle, and the speed range of the engine-driven vehicle is wider.

The hybrid power system has three power transmission states, namely pure electric power transmission state, series hybrid power transmission state and parallel hybrid power transmission state;

The pure electric power transmission state includes the following control steps:

Step 1: The clutch 1 is disconnected and the engine 12 is turned off;

Step 2: The hybrid system is driven by the second motor 14 as the main drive unit. At this time, the second input shaft synchronizer 10 meshes with the second input shaft driving gear 9, and the output torque of the second motor 14 is driven by the difference between The second input shaft driving gear 9 meshed with the external gear of the transmission is transmitted to the output shaft 8;

Step 3: According to the power demand of the hybrid power system, determine whether the motor one 13 participates in the auxiliary drive or not;

If so, the first input shaft synchronizer 5 is meshed with the first input shaft driving gear, and the torque is transmitted to the output shaft 8 through the differential external gear through the first input shaft driving gear;

If not, the first input shaft synchronizer 5 is in the neutral position, at this time, the first input shaft driving gear is idling, and the motor one 13 does not participate in the auxiliary drive.

The series hybrid power transmission state includes the following control steps:

Step 1: The motor one 13 is used as a generator, and at the same time, the hybrid system is driven by the motor two 14 as a drive unit;

Step 2: When the motor one 13 is used as a generator, the first input shaft synchronizer 5 is decoupled from the first input shaft driving gear, and at the same time, the engine 12 is started and combined with the clutch 1, the motor one 13 is The engine 12 generates electricity through the synchronous rotation of the first input shaft 4;

When the second motor 14 is used as the driving unit, the second input shaft synchronizer 10 meshes with the second input shaft driving gear 9, and the second input shaft 11 is connected by the second input shaft driving gear 9 and the differential external gear The torque is transmitted to the output shaft 8 .

The parallel hybrid power transmission state includes the following control steps:

Step 1: The clutch 1 is in the engaged state, and the engine 12 is started;

Step 2: The hybrid system is driven by the engine 12 as the main drive unit. At this time, the first input shaft synchronizer 5 is coupled with the first input shaft driving gear, and the first input shaft 4 is driven by the first input shaft. The shaft drive gear and the differential external gear transmit torque to the output shaft 8;

Step 3: According to the power demand of the hybrid system, determine whether or not the motor 2 14 participates in the auxiliary drive;

If so, the second input shaft synchronizer 10 is meshed with the second input shaft driving gear 9, and the torque is transmitted to the output shaft 8 through the differential external gear through the second input shaft driving gear 9;

If not, the second input shaft synchronizer 10 is in the neutral position, at this time, the second input shaft driving gear 9 is idling, and the second motor 14 does not participate in the auxiliary drive.

It should be pointed out that, in this control method of the hybrid power system, the series hybrid power transmission state is better suitable for the low-speed state of vehicle driving, while the parallel hybrid power transmission state is better suitable for the medium and high-speed state of vehicle driving. , but the present invention is not limited to the power transmission state adopted by the low-speed, medium-speed and high-speed vehicles in practice, that is, it can be understood that the engine 12 can be used as the main drive unit in the medium and high-speed state of the vehicle, and the motor can also be used. as the main drive unit, etc.

Further, when the hybrid power system adopts a two-speed gearbox structure, in the pure electric power transmission state, the step of judging whether or not the motor one 13 participates in the auxiliary drive includes:

Confirm whether or not to participate in auxiliary drive;

If so, the first input shaft synchronizer 5 meshes with the first-speed driving gear 2, and the first-speed driving gear 2 is coupled with the first input shaft 4 through the first input shaft synchronizer 5. At this time, the The first-speed driving gear 2 transmits the torque of the first input shaft 4 to the output shaft 8 through the differential external gear 6 which is constantly meshed with it;

Or, the first input shaft synchronizer 5 meshes with the second-speed driving gear 3, and the second-speed driving gear 3 is coupled with the first input shaft 4 through the first input shaft synchronizer 5. At this time, the The second-speed driving gear 3 transmits the torque of the first input shaft 4 to the output shaft 7 through the second differential external gear 7 which is constantly meshed with it.

If not, the first input shaft synchronizer 5 is in the neutral position. At this time, both the first-speed driving gear 2 and the second-speed driving gear 3 are idling, and the motor 1 13 does not participate in auxiliary driving.

Further, when the hybrid power system adopts a two-speed gearbox structure, in the series hybrid power transmission state, the steps when the motor one 13 is used as a generator include:

The first drive gear 2 and the second-speed drive gear 3 are both idling. At this time, the first input shaft synchronizer 5 is decoupled from the first input shaft 4, and at the same time, the engine 12 is started and combined with the clutch 1, so the The first motor 13 generates electricity through the synchronous rotation of the first input shaft 4 by the engine 12 .

Further, when the hybrid power system adopts a two-speed gearbox structure, in the parallel hybrid power transmission state, the step of driving the hybrid power system by the engine 12 as the main drive unit includes:

The first input shaft synchronizer 5 is coupled with the first driving gear 2, and the first input shaft 4 transmits torque to the output shaft through the first driving gear 2 and the differential external gear 1 6;

Or, the first input shaft synchronizer 5 is coupled with the second driving gear 3 , and the first input shaft 4 transmits torque to the output shaft 8 through the second driving gear 3 and the second differential external gear 7 .

Further, in the second step in the parallel hybrid transmission state, when the hybrid power system is driven by the engine 12 as the drive unit, and at the same time according to the power demand of the hybrid power system, it is determined whether the motor one 13 participates in the auxiliary drive or not. , power generation or idling, and include the following steps:

If participating in driving, the engine 12 is linked with the motor one 13 through the first input shaft 4, at this time, the motor one 13 transmits the torque to the output shaft 8 through the first input shaft 4;

If participating in power generation, the engine 12 is connected to the motor one 13 through the first input shaft 4, and at this time, the motor one 13 generates electricity through the first input shaft 4;

If idling, the engine 12 is connected to the motor one 13 through the first input shaft 4, and at the same time, the motor one 13 is idling.

It should be pointed out that those skilled in the art can understand the power demand of the hybrid power system as the energy state of the vehicle, that is, the state of the fuel tank oil quantity for supplying power to the engine 12 and the power supply for the motor one 13 and the motor two 14 are included. The state of charge of the battery pack, in practice, the driver can implement different power system controls according to the above-mentioned power demand state. Meanwhile, this embodiment does not limit the driver to arbitrarily select the control of the power system with operability.

Further, the hybrid power system is provided with a braking energy recovery system, which recovers braking energy by converting the first motor 13 and the second motor 14 participating in the driving from the driving state to the power generating state.

The above-mentioned embodiments merely describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various modifications to the technical solutions of the present invention. Variations and improvements should fall within the protection scope determined by the claims of the present invention.

Claims (13)

1. A hybrid powertrain system, comprising:

an engine;

a first motor;

a second motor;

the parallel shaft gearbox is provided with a first input shaft, a second input shaft and an output shaft which are arranged in parallel in a box body of the parallel shaft gearbox, one end of the first input shaft is connected with a first motor, the other end of the first input shaft is connected with an engine through a clutch, and one end of the second input shaft is connected with a second motor.

2. A hybrid powertrain, as claimed in claim 1, wherein: the output shaft is connected with a differential mechanism, a differential mechanism external gear is arranged on the differential mechanism, a first input shaft driving gear is arranged on the first input shaft, the first input shaft driving gear is normally meshed with the differential mechanism external gear, a second input shaft driving gear is arranged on the second input shaft, and the second input shaft driving gear is normally meshed with the differential mechanism external gear.

3. A hybrid powertrain, as claimed in claim 2, wherein: the first input shaft driving gear comprises a first-gear driving gear and a second-gear driving gear;

and a first input shaft synchronizer is arranged between the first-gear driving gear and the second-gear driving gear, and the first-gear driving gear or the second-gear driving gear is coupled or decoupled with the first input shaft by the first input shaft synchronizer.

4. A hybrid powertrain, as claimed in claim 2, wherein: and a second input shaft synchronizer is arranged on the second input shaft, and the second input shaft driving gear is coupled or decoupled with the second input shaft by the second input shaft synchronizer.

5. A hybrid powertrain, as claimed in claim 2, wherein: the first input shaft is provided with a first input shaft synchronizer, and the first input shaft driving gear is coupled or decoupled with the first input shaft through the first input shaft synchronizer.

6. A hybrid powertrain, as claimed in claim 3, wherein: the differential external gear comprises a differential external gear I and a differential external gear II;

the first-gear driving gear is in constant mesh with the differential external gear, the second-gear driving gear is in constant mesh with the differential external gear, and the first input shaft controls the gear thereof by virtue of the first input shaft synchronizer and is coupled or decoupled with the output shaft.

7. A hybrid powertrain, as claimed in claim 3, wherein: the differential external gear comprises a differential external gear I and a differential external gear II;

the second input shaft driving gear is constantly meshed with the differential external gear, the gear of the second input shaft is controlled by the second input shaft synchronizer, and the second input shaft driving gear is coupled or decoupled with the output shaft.

8. The control method of the hybrid system according to any one of claims 1 to 7, characterized in that: the hybrid power system comprises three power transmission states, namely a pure power transmission state, a series hybrid power transmission state and a parallel hybrid power transmission state;

the pure electric power transmission state comprises the following control steps:

the method comprises the following steps: the clutch is disconnected, and the engine is turned off;

step two: the hybrid power system is driven by taking a second motor as a main driving unit, at the moment, the synchronizer of the second input shaft is meshed with the driving gear of the second input shaft, and the output torque of the second motor is transmitted to an output shaft by the driving gear of the second input shaft meshed with the external gear of the differential mechanism;

step three; judging whether the motor participates in auxiliary driving or not according to the power requirement of the hybrid power system;

if so, the first input shaft synchronizer is meshed with a first input shaft driving gear, and the torque is transmitted to an output shaft through a differential external gear by the first input shaft driving gear;

if not, the first input shaft synchronizer is in a neutral position, at the moment, the first input shaft driving gear idles, and the motor does not participate in auxiliary driving.

The series hybrid power transmission state comprises the following control steps:

the method comprises the following steps: the first motor serves as a generator, and meanwhile, the hybrid power system is driven by taking the second motor as a driving unit;

step two: when the first motor serves as a generator, the first input shaft synchronizer is decoupled from the first input shaft driving gear, meanwhile, the engine is started and combined with the clutch, and the first motor generates electricity through synchronous rotation of the first input shaft by the aid of the engine;

when the second motor serves as a driving unit, the second input shaft synchronizer is meshed with a second input shaft driving gear, and the second input shaft transmits torque to an output shaft through the second input shaft driving gear and the differential external gear.

The parallel hybrid power transmission state comprises the following control steps:

the method comprises the following steps: the clutch is in a combined state, and the engine is started;

step two: the hybrid power system is driven by taking an engine as a main driving unit, at the moment, the first input shaft synchronizer is coupled with a first input shaft driving gear, and the first input shaft transmits torque to an output shaft by the first input shaft driving gear and a differential external gear;

step three: judging whether the second motor or the auxiliary drive is participated in according to the power requirement of the hybrid power system;

if so, the second input shaft synchronizer is meshed with a second input shaft driving gear, and the torque is transmitted to an output shaft through a differential external gear by the second input shaft driving gear;

if not, the second input shaft synchronizer is in a neutral position, at the moment, the second input shaft driving gear idles, and the second motor does not participate in auxiliary driving.

9. The control method of a hybrid system according to claim 8, characterized in that: in the pure electric power transmission state, the step of judging whether the motor is in the first state or not to participate in auxiliary driving comprises the following steps:

confirming whether to participate in the auxiliary drive;

if so, the first input shaft synchronizer is meshed with a first gear driving gear, the first gear driving gear is coupled with the first input shaft through the first input shaft synchronizer, and at the moment, the first gear driving gear transmits the first input shaft torque to an output shaft through a differential external gear which is normally meshed with the first input shaft;

or, the first input shaft synchronizer is meshed with a second gear driving gear, the second gear driving gear is coupled with the first input shaft by the first input shaft synchronizer, and at the moment, the second gear driving gear transmits the torque of the first input shaft to an output shaft through a second differential external gear which is normally meshed with the second input shaft synchronizer; .

If not, the first input shaft synchronizer is in a neutral position, at the moment, the first gear driving gear and the second gear driving gear both idle, and the first motor does not participate in auxiliary driving.

10. The control method of a hybrid system according to claim 8, characterized in that: in the series hybrid transmission state, the step of operating the first electric machine as a generator comprises:

the first driving gear and the second driving gear idle, at the moment, the first input shaft synchronizer is decoupled from the first input shaft, meanwhile, the engine is started and combined with the clutch, and the first motor generates electricity through synchronous rotation of the first input shaft by the aid of the engine.

11. The control method of a hybrid system according to claim 8, characterized in that: in the parallel hybrid transmission state, the step of driving the hybrid system by taking the engine as a main driving unit comprises the following steps:

the first input shaft synchronizer is coupled with a first driving gear, and the first input shaft transmits torque to an output shaft through the first driving gear and a first differential external gear;

or, the first input shaft synchronizer is coupled with the second driving gear, and the first input shaft transmits the torque to the output shaft through the second driving gear and the second differential external gear.

12. The control method of a hybrid system according to claim 8, characterized in that: in the second step of the parallel hybrid transmission state, when the hybrid system is driven by the engine as the driving unit, and meanwhile, according to the power demand of the hybrid system, it is determined whether the motor is involved in auxiliary driving, power generation or idling, and the method includes the following steps:

if the engine is driven, the engine is linked with the first motor through the first input shaft, and at the moment, the first motor transmits torque to the output shaft through the first input shaft;

if the engine participates in power generation, the engine is connected with a first motor through a first input shaft, and at the moment, the first motor generates power through the first input shaft;

if the engine idles, the engine is connected with a first motor through the first input shaft, and meanwhile, the first motor idles.

13. The control method of a hybrid system according to claim 8, characterized in that: the hybrid power system is provided with a braking energy recovery system, and the braking energy recovery system recovers braking energy by converting a first motor and a second motor which participate in driving from a driving state to a power generation state.

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