WO2022082410A1

WO2022082410A1 - Hybrid power system for engineering and agricultural machinery

Info

Publication number: WO2022082410A1
Application number: PCT/CN2020/122075
Authority: WO
Inventors: 尹世安; 杨林; 羌嘉曦; 陈立建
Original assignee: 南京朗禾智能控制研究院有限公司
Priority date: 2020-10-19
Filing date: 2020-10-20
Publication date: 2022-04-28
Also published as: CN112298158A; CN112172786A

Abstract

A hybrid power system for engineering and agricultural machinery. The hybrid power system comprises an engine (1), a first clutch (2), a second clutch (3), a first electric motor (4), a second electric motor (5) and a gearbox (6), wherein an output shaft of the engine (1) is connected to an output shaft of the first electric motor (4) by means of the first clutch (2); an output shaft of the first electric motor (4) is in transmission connection with a main shaft of the gearbox (6) by means of the second clutch (3); and the second electric motor (5) is in transmission connection with the main shaft of the gearbox (6). The hybrid power system uses a hybrid power mode of an engine and electric motors; and a working range of the engine can be controlled and adjusted due to the introduction of the electric motors, such that the engine works in an efficient area most of the time, thereby improving the fuel efficiency of an internal combustion engine; meanwhile, a low-efficiency link, i.e. a hydraulic torque converter in a traditional apparatus, is canceled due to the addition of the electric motors, such that the efficiency of a transmission system is also improved.

Description

A hybrid system for construction and agricultural machinery

technical field

The present invention relates to the technical field of hybrid power systems, in particular to a hybrid power system for engineering and agricultural machinery.

Background technique

In engineering and agricultural machinery, due to the need to consider the requirements of maximum traction and maximum operating functions, the power matching of the internal combustion engine is far greater than the demand of the system during normal operation, which will cause a certain amount of power waste during normal operation, resulting in the internal combustion engine often working in low efficiency. area. In addition, due to the dramatic load changes during operation, in order to reduce the impact on the internal combustion engine and transmission system, most engineering and agricultural machinery are equipped with hydraulic torque converters, and the transmission efficiency of hydraulic torque converters is lower than that of mechanical transmission.

During the working process of engineering and agricultural machinery, the advancing and retreating and the lifting and lowering of the operating device are frequent, and due to the large load mass, a large amount of potential energy will be released during the advancing, retreating and descending process, and most of this energy is consumed in braking and other aspects and converted For thermal energy consumption, this results in wasted energy and heating of the system, and also reduces the life of components.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a hybrid power system for engineering and agricultural machinery.

In order to solve the above technical problems, the technical scheme of the present invention is as follows:

A hybrid power system for engineering and agricultural machinery includes an engine, a first clutch, a second clutch, a first motor, a second motor and a gearbox, and an output shaft of the engine communicates with the The output shaft of the first motor is connected, the output shaft of the first motor is drivingly connected with the main shaft of the gearbox through the second clutch, and the second motor is drivingly connected with the main shaft of the gearbox.

As a preferred solution of the hybrid power system for construction and agricultural machinery according to the present invention, it further includes an excitation device for adding an excitation current to the output shaft of the first motor, so that the first motor can be Used as a generator.

The present invention also provides a control method for a hybrid power system for construction and agricultural machinery, the control method controls the hybrid power system for construction and agricultural machinery to operate in any one of the working modes, the The working modes include a single-motor pure electric mode, a dual-motor pure electric mode, a series hybrid mode, a series-parallel hybrid mode, a hybrid co-drive mode, and an engine-only drive mode.

As a preferred solution of the control method for the hybrid power system for construction and agricultural machinery according to the present invention, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a single-motor pure electric mode includes: controlling all the The first clutch and the second clutch are disengaged, the engine and the first motor are controlled to not work, the second motor is controlled to start, and the main shaft of the gearbox is driven to rotate.

As a preferred solution of the control method for the hybrid power system for construction and agricultural machinery according to the present invention, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a dual-motor pure electric mode includes: controlling all The first clutch is disengaged, the second clutch is engaged, the engine is controlled to not work, and the first motor and the second motor are controlled to start, so as to jointly drive the main shaft of the gearbox to rotate.

As a preferred solution of the control method for the hybrid power system for construction and agricultural machinery according to the present invention, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a series hybrid mode comprises: controlling the The first clutch is engaged, the second clutch is disengaged, and the engine and the second motor are controlled to work, the engine drives the first motor to rotate and generate electricity, and the second motor drives the main shaft of the gearbox to rotate.

As a preferred solution of the control method for the hybrid power system for construction and agricultural machinery according to the present invention, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a series-parallel hybrid power mode includes: controlling all The first clutch and the second clutch are engaged to control the engine and the second motor to work, the engine and the second motor jointly drive the main shaft of the gearbox to rotate, and the engine drives the The first motor rotates to generate electricity.

As a preferred solution of the control method for the hybrid power system for construction and agricultural machinery according to the present invention, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a hybrid common drive mode includes: controlling the The first clutch and the second clutch are engaged, and the engine, the first motor and the second motor are controlled to work, so that the engine, the first motor and the second motor jointly drive the transmission The spindle of the box rotates.

As a preferred solution of the control method for the hybrid power system for construction and agricultural machinery according to the present invention, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in an engine-only driving mode includes: controlling the The first clutch and the second clutch are engaged to control the operation of the engine, the first motor and the second motor are not operated, and the engine drives the main shaft of the transmission to rotate.

The beneficial effects of the present invention are:

(1) The present invention adopts the hybrid mode of the engine and the motor. Due to the intervention of the motor, the working range of the engine can be controlled and adjusted, so that the engine works in the high-efficiency area most of the time, thereby improving the fuel efficiency of the internal combustion engine. The inefficient link of the torque converter in the traditional equipment is eliminated, and the efficiency of the transmission system has also been improved;

(2) The present invention can add excitation current to the first motor and the second motor through the excitation device, so that the first motor can be used as a generator, and at the same time, during the braking process of the system, the second motor can generate electricity and play a role in slow The function of the speed reducer can not only recover energy, but also reduce the impact on the transmission system and reduce the wear of the brake;

(3) The power of the internal combustion engine assembled after the hybrid power system is adopted in the present invention can be about 20% smaller than that of the original model, which greatly reduces the purchase cost of the engine.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a schematic structural diagram of a hybrid power system for engineering and agricultural machinery provided by the present invention;

Among them: 1. Engine; 2. First clutch; 3. Second clutch; 4. First motor; 5. Second motor; 6. Gearbox.

Detailed ways

In order to make the content of the present invention easier to understand clearly, the present invention will be further described in detail below according to specific embodiments and in conjunction with the accompanying drawings.

This embodiment provides a hybrid power system for construction and agricultural machinery, including an engine 1 , a first clutch 2 , a second clutch 3 , a first motor 4 , a second motor 5 and a gearbox 6 . The output shaft of the engine 1 is connected to the output shaft of the first motor 4 through the first clutch 2, the output shaft of the first motor 4 is connected to the main shaft of the gearbox 6 through the second clutch 3, and the second motor 5 is connected to the main shaft of the gearbox 6. The main shaft of the gearbox 6 is connected to the transmission.

Preferably, an excitation device is also included, which can add excitation current to the first motor 4. When the output shaft of the first motor 4 rotates, the first motor 4 can be used as a generator.

This embodiment also provides a control method for a hybrid power system of an engineering and agricultural machinery, and the control method is used to control the hybrid power system to operate in any working mode. Among them, the working modes include single-motor pure electric mode, dual-motor pure electric mode, series hybrid mode, series-parallel hybrid mode, hybrid common drive mode, and engine 1 independent drive mode.

When the hybrid power system is controlled to operate in a single-motor pure electric mode, the first clutch 2 and the second clutch 3 are controlled to be disengaged, the engine 1 and the first motor 4 are controlled to not work, and the second motor 5 is controlled to start. The second motor 5 drives the main shaft of the gearbox 6 to rotate.

When the hybrid system is controlled to run in the dual-motor pure electric mode, the first clutch 2 is controlled to disengage, the second clutch 3 is engaged, the engine 1 is controlled to not work, and the first motor 4 and the second motor 5 are controlled to start. A motor 4 and a second motor 5 jointly drive the main shaft of the gearbox 6 to rotate.

When the hybrid system is controlled to run in the series hybrid mode, the first clutch 2 is controlled to be engaged, the second clutch 3 is disengaged, and the engine 1 and the second motor 5 are controlled to work, at this time, the engine 1 drives the output shaft of the first motor 4 rotation, and the excitation device adds excitation current to the first motor 4, so that the first motor 4 is used as a generator to generate electricity, while the second motor 5 drives the main shaft of the gearbox 6 to rotate.

When the hybrid power system is controlled to operate in the series-parallel hybrid power mode, the first clutch 2 and the second clutch 3 are controlled to engage, and the engine 1 and the second motor 5 are controlled to work. At this time, the engine 1 and the second motor 5 jointly drive the transmission The main shaft of the box 6 rotates, and at the same time, the engine 1 drives the output shaft of the first motor 4 to rotate, and the excitation device adds excitation current to the first motor 4, so that the first motor 4 is used as a generator to generate electricity.

When the hybrid power system is controlled to run in the engine 1 independent driving mode, the first clutch 2 and the second clutch 3 are controlled to engage, and the engine 1 is controlled to work, the first motor 4 and the second motor 5 are not to work, and the engine 1 alone The main shaft that drives the transmission rotates.

In addition, it should be noted that the excitation device can also add excitation current to the second motor 5. During the braking process of the system, the second motor 5 can generate electricity and play the role of a retarder, which can not only recover energy, but also It can reduce the impact on the transmission system and reduce the wear of the brake.

Therefore, the present invention adopts the hybrid mode of the engine 1 and the electric motor. Due to the intervention of the electric motor, the working range of the engine 1 can be controlled and adjusted, so that the engine 1 works in the high-efficiency area most of the time, thereby improving the fuel efficiency of the internal combustion engine. At the same time, The addition of the motor eliminates the inefficient link of the torque converter in the traditional equipment, so that the efficiency of the transmission system has also been improved.

In addition to the above-mentioned embodiments, the present invention may also have other embodiments; all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

A hybrid power system for engineering and agricultural machinery, characterized in that it comprises an engine (1), a first clutch (2), a second clutch (3), a first motor (4), and a second motor (5) and gearbox (6),

The output shaft of the engine (1) is connected with the output shaft of the first electric motor (4) through the first clutch (2), and the output shaft of the first electric motor (4) passes through the second clutch ( 3) Drive connection with the main shaft of the gearbox (6), and the second motor (5) is drive connected with the main shaft of the gearbox (6).
A hybrid power system for construction and agricultural machinery according to claim 1, characterized in that it further comprises an excitation device for adding excitation current to the outside of the output shaft of the first motor (4), so that the The first electric machine (4) can be used as a generator.
A control method for a hybrid power system for construction and agricultural machinery based on claim 2, wherein the control method controls the hybrid power system for construction and agricultural machinery to adopt any one of the working modes. An operation, the operating modes include a single-motor pure electric mode, a dual-motor pure electric mode, a series hybrid mode, a series-parallel hybrid mode, a hybrid common drive mode, and an engine (1) independent drive mode.
A control method for a hybrid power system for construction and agricultural machinery according to claim 3, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a single-motor pure electric mode includes: controlling The first clutch (2) and the second clutch (3) are disengaged, the engine (1) and the first motor (4) are controlled to not work, and the second motor (5) is controlled to start and drive The main shaft of the gearbox (6) rotates.
A control method for a hybrid power system for construction and agricultural machinery according to claim 3, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a dual-motor pure electric mode comprises: controlling: The first clutch (2) is disengaged, the second clutch (3) is engaged, the engine (1) is controlled to not work, the first motor (4) and the second motor (5) are controlled to start, The main shafts of the gearbox (6) are jointly driven to rotate.
A control method for a hybrid power system for construction and agricultural machinery according to claim 3, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a series hybrid power mode comprises: controlling all the The first clutch (2) is engaged, the second clutch (3) is disengaged, the engine (1) and the second motor (5) are controlled to work, and the engine (1) drives the first motor ( 4) Rotation to generate electricity, the second motor (5) drives the main shaft of the gearbox (6) to rotate.
A control method for a hybrid power system for construction and agricultural machinery according to claim 3, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a series-parallel hybrid power mode comprises: controlling The first clutch (2) and the second clutch (3) are engaged to control the engine (1) and the second motor (5) to work, the engine (1) and the second motor ( 5) The main shaft of the gearbox (6) is jointly driven to rotate, and the engine (1) drives the first motor (4) to rotate and generate electricity.
A control method for a hybrid power system for construction and agricultural machinery according to claim 3, wherein: controlling the hybrid power system for construction and agricultural machinery to operate in a hybrid common drive mode comprises: controlling all The first clutch (2) and the second clutch (3) are engaged, and the engine (1), the first motor (4) and the second motor (5) are controlled to work, so that the engine ( 1) The first motor (4) and the second motor (5) jointly drive the main shaft of the gearbox (6) to rotate.
A control method for a hybrid power system for construction and agricultural machinery according to claim 3, characterized in that: controlling the hybrid power system for construction and agricultural machinery to operate in an engine (1) independent driving mode comprises the following steps: : control the engagement of the first clutch (2) and the second clutch (3), control the engine (1) to work, the first motor (4) and the second motor (5) to not work, The engine (1) drives the main shaft of the transmission to rotate.