Hybrid power structure of engineering machinery and electric energy supply method

Abstract

The invention discloses a hybrid power structure of engineering machinery and an electric energy supply method. The structure comprises an engine, a generator, a first motor controller, a second motor controller, a driving motor, a gearbox, a clutch, a PTO, a hydraulic pump, an operation device and an axle. The engine is connected with the generator, the generator is connected to the first motor controller, the first motor controller is connected with the second motor controller, the second motor controller is connected with the driving motor, the driving motor is connected to the axle through the gearbox, and the gearbox is connected to the axle. The driving motor is further connected with the clutch, the clutch is connected with the PTO, and the PTO is connected with the operation device through the hydraulic pump. According to the hybrid power structure in the embodiment, the engine and the generator are coupled to serve as the range extender, and electric energy supply capable of being flexibly switched between the vehicle-mounted range extender and the external power grid according to the working environment can be achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of engineering machinery, and in particular to a hybrid power structure and an electric energy supply method of an engineering machinery. Background Art

[0002] Engineering machinery is an important part of the equipment industry. Generally speaking, all mechanical equipment required for earthwork construction, road construction and maintenance, mobile lifting and loading and unloading operations, and comprehensive mechanized construction projects required for various construction projects are called engineering machinery.

[0003] When traditional construction machinery needs two sets of power sources for driving and operation, two engines are usually used, one for chassis driving and one for upper installation. However, construction machinery consumes a lot of fuel, and users have a strong demand for fuel saving. At the same time, with the tightening of emission regulations, the cost of engines and post-processing is getting higher and higher, and the size of the post-processing system is increasing and it is difficult to arrange. At present, if pure electric solutions are used for both driving and operation, more batteries must be carried, which has the problems of high battery cost, the batteries carried by themselves cannot meet the needs of long-term operation, and the external power supply is easily restricted by site conditions. It is not suitable for the use scenarios of construction machinery. Summary of the invention

[0004] In order to solve the problems in the prior art, the present invention provides a hybrid power structure and a power supply method for engineering machinery, thereby realizing a power supply mode that is flexibly switched between an on-board range extender and an external power grid according to the working environment.

[0005] In a first aspect, an embodiment of the present invention provides a hybrid power structure of an engineering machinery, including: An engine, a generator, a first motor controller, a second motor controller, a drive motor, a gearbox, a clutch, a PTO, a hydraulic pump, and a working device; The engine is connected to the generator, the generator is connected to the first motor controller, the first motor controller is connected to the second motor controller, the second motor controller is connected to the drive motor, the drive motor is connected to the axle through the gearbox, the drive motor is also connected to the clutch, the clutch is connected to the PTO, and the PTO is connected to the working device through a hydraulic pump.

[0006] Optionally, a power battery is also included, and the power battery is connected to the first motor controller.

[0007] Optionally, a charger is further included, wherein an input end of the charger is connected to an external power grid, and an output end of the charger is connected to the power motor, the first motor controller and the second motor controller.

[0008] In a second aspect, the present invention further provides a method for supplying electric energy to an engineering machine, which is implemented based on the hybrid power structure of the engineering machine described in any one of the above items, and comprises: When the construction machinery is in driving condition, the range extender consisting of the engine and the generator provides power to the chassis system; When the construction machinery is in operation, the drive motor is powered by a range extender consisting of an engine and a generator or an external power grid, and the drive motor provides power to the hydraulic pump through the PTO.

[0009] Furthermore, the power supply method in this embodiment specifically includes: 1. Extended range driving: The chassis driving system is driven by a drive motor, and the range extender consisting of an engine and a generator generates electricity to provide power. This hybrid structure can significantly reduce the battery capacity.

[0010] 2. Operation: During operation, the drive motor provides power to the hydraulic pump through the power take-off device PTO.

[0011] The main working conditions are as follows: 1. The range extender generates electricity, which is used to drive the electric motor to drive the hydraulic pump; 2. The range extender generates electricity, part of which is used to drive the motor to drive the hydraulic pump, and the other part is used to charge the power battery; 3. The range extender stops, the drive motor drives the hydraulic pump, and the power is provided by the power battery; 4. When the external power grid can be connected, the external power grid will be used first to meet the operating power demand, and the insufficient part will be supplemented by the range extender; when the operating power is less than the maximum power of the charger, the power battery can be charged at the same time. Beneficial Effects

[0012] The chassis driving system and the operating system in the present invention are both driven by a drive motor, and share a drive motor; the upper engine is coupled with a generator as a range extender. When the engineering machinery is in a driving condition, the range extender composed of the engine and the generator provides power to the chassis system; when the engineering machinery is in an operating condition, the range extender composed of the engine and the generator or the external power grid supplies power to the drive motor. Therefore, the power supply of the engineering machinery in the present invention can be flexibly switched between the on-board range extender and the external power grid according to the working environment; in addition, compared with the prior art, the engineering machinery structure in the present invention reduces one engine and post-processing system, and the chassis is a pure electric chassis, which can enjoy relevant national new energy policies; the fuel saving rate is high, and the fuel use cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a hybrid power structure of an engineering machinery provided by an embodiment of the present invention.

[0014] Among them, 1. Engine; 2. Generator; 3. First motor controller; 4. Second motor controller; 5. Drive motor; 6. Gearbox; 7. Clutch; 8. PTO; 9. Hydraulic pump; 10. Working device; 11. Axle; 12. Power battery; 13. Charger; 14. Electrical accessories. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings. Example

[0016] Figure 1 A schematic diagram of a hybrid power structure of an engineering machine provided by an embodiment of the present invention. Figure 1 , the hybrid power structure specifically includes: Engine 1, generator 2, first motor controller 3, second motor controller 4, drive motor 5, gearbox 6, clutch 7, PTO 8, hydraulic pump 9 and working device 10; The engine 1 is connected to the generator 2, the generator 2 is connected to the first motor controller 3, the first motor controller 3 is connected to the second motor controller 4, the second motor controller 4 is connected to the drive motor 5, the drive motor 5 is connected to the axle 11 through the gearbox 6, the drive motor 5 is also connected to the clutch 7, the clutch 7 is connected to the PTO 8, and the PTO 8 is connected to the working device 10 through the hydraulic pump 9.

[0017] Furthermore, the structure also includes a power battery 12 , and the power battery 12 is connected to the first motor controller 3 .

[0018] Furthermore, the structure also includes a charger 13 , an input end of the charger 13 is connected to the external power grid, and an output end of the charger 13 is connected to the power motor, the first motor controller 3 , and the second motor controller 4 .

[0019] Furthermore, the structure also includes an electrical auxiliary component 14 connected to the charger 13 .

[0020] Compared with the existing structure, the hybrid power structure provided by the embodiment of the present invention reduces one engine and post-processing system. In addition, the chassis in the present invention is a pure electric chassis, which can benefit from relevant national new energy policies; the fuel saving rate is high, and the fuel use cost is greatly reduced.

[0021] On the basis of the above embodiments, the present invention further provides a method for supplying electric energy to an engineering machine, specifically comprising: coupling a generator to an upper engine as a range extender, and when the engineering machine is in a driving condition, the range extender composed of the engine and the generator provides power to the chassis system; When the construction machinery is in operation, the drive motor is powered by a range extender consisting of an engine and a generator or an external power grid, and the drive motor provides power to the hydraulic pump through the PTO.

[0022] Furthermore, the power supply method in this embodiment specifically includes: 1. Driving conditions The engine and generator form a range extender. The clutch is disengaged. Based on parameters such as the SOC status of the power battery, the range extender generates electricity according to the vehicle power request to meet driving needs.

[0023] 2. Parking operation conditions During operation, the clutch is engaged and the transmission is placed in neutral.

[0024] 1. Cannot be connected to external power grid 1.1 The engine 1 and the generator 2 form a range extender to generate electricity, and the generated electricity is used to drive the motor 5 to drive the hydraulic pump 9 through the PTO 8.

[0025] 1.2 The engine 1 and the generator 2 form a range extender to generate electricity. Part of the generated electricity is used to drive the drive motor 5 through the PTO 8 to drive the hydraulic pump 9, and the other part is used to charge the power battery 12.

[0026] 1.3 The engine 1 and the generator 2 form a range extender to generate electricity, and the generated electricity is used to drive the motor 5 to drive the hydraulic pump 9 through the PTO 8, and the insufficient part is supplemented by the power battery 12.

[0027] 1.4 The range extender composed of the engine 1 and the generator 2 is shut down, and the drive motor 5 drives the hydraulic pump 9 through the PTO 8 , and the power of the drive motor 5 comes from the power battery 12 .

[0028] 2. Can be connected to external power grid 2.1 The engine 1 and the generator 2 form a range extender to generate electricity. The drive motor 5 drives the hydraulic pump 9 through the PTO 8. The power of the drive motor 5 comes from the external power grid through the charger 13. The insufficient power is supplemented by the engine 1 and the generator 2 to form a range extender to generate electricity.

[0029] 2.2 The range extender composed of the engine 1 and the generator 2 is shut down, and the drive motor 5 drives the hydraulic pump 9 through the PTO 8. The power of the drive motor 5 comes from the external power grid through the charger 13, and the insufficient part is supplemented by the power battery 12.

[0030] 2.3 The range extender composed of the engine 1 and the generator 2 is shut down, and the drive motor 5 drives the hydraulic pump 9 through the PTO 8. The power of the drive motor 5 comes from the external power grid through the charger 13.

[0031] 2.4 The range extender composed of the engine 1 and the generator 2 is shut down, the drive motor 5 drives the hydraulic pump 9 through the PTO 8, and the power of the drive motor 5 comes from the external power grid through the charger 13; at the same time, the external power grid charges the power battery 12 through the charger 13.

[0032] 3. Working conditions during driving When working while driving, the clutch is engaged and the transmission is placed in the gear required for driving.

[0033] 3.1 The engine 1 and the generator 2 form a range extender to generate electricity, and the generated electricity is used to drive the drive motor 5 to drive the axle 11 through the transmission, and at the same time, the drive motor 5 drives the hydraulic pump 9 through the PTO 8.

[0034] 3.2 The engine 1 and the generator 2 form a range extender to generate electricity. Part of the generated electricity is used to drive the drive motor 5 to drive the axle 11 through the transmission, part of the generated electricity is used to drive the drive motor 5 to drive the hydraulic pump 9 through the PTO 8, and the other part is used to charge the power battery 12.

[0035] 3.3 The engine 1 and the generator 2 form a range extender to generate electricity. The electricity generated is used to drive the drive motor 5 through the transmission to drive the axle 11, and the drive motor 5 drives the hydraulic pump 9 through the PTO 8. The insufficient part is supplemented by the power battery 12.

[0036] 3.4 The range extender composed of the engine 1 and the generator 2 is shut down, the drive motor 5 drives the axle 11 through the transmission, and at the same time the drive motor 5 drives the hydraulic pump 9 through the PTO 8, and the power of the drive motor 5 comes from the power battery 12.

[0037] In the embodiment of the present invention, an engine is coupled to a generator as a range extender. When the engineering machinery is in a driving condition, the range extender composed of the engine and the generator provides power to the chassis system; when the engineering machinery is in an operating condition, the drive motor is powered by the range extender composed of the engine and the generator or an external power grid. Therefore, the power supply of the engineering machinery in the present invention can be flexibly switched between the on-board range extender and the external power grid according to the working environment.

[0038] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A hybrid power structure of an engineering machinery, characterized in that: include: An engine, a generator, a first motor controller, a second motor controller, a drive motor, a gearbox, a clutch, a PTO, a hydraulic pump, a working device, and an axle; The engine is connected to the generator, the generator is connected to the first motor controller, the first motor controller is connected to the second motor controller, the second motor controller is connected to the drive motor, the drive motor is connected to the axle through the gearbox, the drive motor is also connected to the clutch, the clutch is connected to the PTO, and the PTO is connected to the working device through a hydraulic pump.

2. The structure according to claim 1, characterized in that: It also includes a power battery connected to the first motor controller.

3. The structure according to claim 1, characterized in that: It also includes a charger, wherein an input end of the charger is connected to an external power grid, and an output end of the charger is connected to the power motor, the first motor controller and the second motor controller.

4. A method for supplying electric energy to an engineering machine, implemented based on the hybrid power structure of the engineering machine according to any one of claims 1 to 3, characterized in that: include: When the construction machinery is in driving condition, the range extender consisting of the engine and the generator provides power to the chassis system; When the construction machinery is in operation, the drive motor is powered by a range extender consisting of an engine and a generator or an external power grid.

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