Hybrid power structure of engineering machinery

Abstract

The utility model discloses a hybrid power structure of engineering machinery. 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 utility model relates to engineering machinery technical field especially relates to a hybrid power structure of engineering machinery. BACKGROUND

[0002] Engineering machinery is an important component of equipment industry. In general, all earthwork construction projects, pavement construction and maintenance, mobile hoisting and unloading operations, and comprehensive mechanized construction projects required by various construction projects are necessary mechanical equipment, which is called engineering machinery.

[0003] When the traditional engineering machinery needs two sets of power sources for driving and operation, two engines are usually used, one for chassis driving and the other for upper operation. However, the oil consumption of engineering machinery is large, and the user's demand for oil saving is very strong; at the same time, with the tightening of emission regulations, the cost of engine and aftertreatment is getting higher and higher, and the volume of aftertreatment system is increasing, which is difficult to arrange. If driving and operation are both pure electric schemes, more batteries must be carried, which has the problems of high battery cost, inability of self-carrying battery to meet long-time operation, and external power supply easily restricted by site conditions, which is not suitable for engineering machinery use scene. SUMMARY

[0004] In order to solve the problems in the prior art, the utility model provides a hybrid power structure of engineering machinery, so as to realize the flexible switching of electric energy supply mode between the vehicle-mounted range extender and the external power grid according to the working environment.

[0005] The utility model embodiment provides a hybrid power structure of engineering machinery, comprising:

[0006] Engine, generator, first motor controller, second motor controller, drive motor, gearbox, clutch, PTO, hydraulic pump and operation device;

[0007] The engine and the generator are connected, the generator is connected to the first motor controller, the first motor controller and the second motor controller are connected, the second motor controller and the drive motor are connected, 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 operation device through the hydraulic pump.

[0008] Optionally, it further comprises a power battery, and the power battery is connected to the first motor controller.

[0009] Optionally, it further comprises a charger, the input end of the charger is connected to an external power grid, and the output end of the charger is connected to the power battery, the first motor controller and the second motor controller.

[0010] The utility model also provides a kind of electric energy supply method of engineering machinery, based on the hybrid power structure of any one described above implementation, comprising:

[0011] When engineering machinery is in driving condition, the range extender formed by engine and generator provides power for chassis system;

[0012] When engineering machinery is in operation, the range extender formed by engine and generator or external power grid supplies power to driving motor, and driving motor provides power to hydraulic pump through PTO.

[0013] Further, the electric energy supply method in the embodiment specifically includes:

[0014] I. Extended driving: chassis driving system is driven by driving motor, and the range extender formed by engine and generator generates electricity to provide power, and the hybrid power structure can greatly reduce battery carrying capacity.

[0015] II. Operation: when operating, driving motor provides power to hydraulic pump through power output device PTO.

[0016] Main operating conditions are as follows:

[0017] 1. The range extender generates electricity, and the generated electricity drives hydraulic pump;

[0018] 2. The range extender generates electricity, and part of the generated electricity drives hydraulic pump, and the other part charges power battery;

[0019] 3. The range extender stops, driving motor drives hydraulic pump, and power is provided by power battery.

[0020] 4. When external power grid can be connected, external power grid is preferentially used to meet operating power demand, and insufficient part is supplemented by range extender; when operating power is less than maximum power of charger, power battery can be charged at the same time. Advantages

[0021] In the utility model, chassis driving system and operating system are both driven by driving motor, and share one driving motor; upper-mounted engine is coupled with one generator, as range extender, when engineering machinery is in driving condition, the range extender formed by engine and generator provides power for chassis system; when engineering machinery is in operation, the range extender formed by engine and generator or external power grid supplies power to driving motor. Therefore, electric energy supply of engineering machinery in the utility model can be flexibly switched between vehicle-mounted range extender and external power grid according to working environment; in addition, compared with prior art, engineering machinery structure in the utility model reduces one engine and aftertreatment system, and chassis is pure electric chassis, which can enjoy relevant new energy policy of state; oil saving rate is high, and fuel use cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present application and the drawings without creative labor.

[0023] Figure 1 A schematic diagram of a hybrid power structure of an engineering machine is provided for the embodiments of the present application.

[0024] 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 auxiliary component. DETAILED DESCRIPTION

[0025] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. EMBODIMENT

[0026] Figure 1 A schematic diagram of a hybrid power structure of an engineering machine is provided for the embodiments of the present application. Referring to Figure 1 , the hybrid power structure specifically comprises:

[0027] 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;

[0028] The engine 1 and the generator 2 are connected, the generator 2 is connected to the first motor controller 3, the first motor controller 3 and the second motor controller 4 are connected, the second motor controller 4 and the drive motor 5 are connected, 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.

[0029] Further, the structure further comprises a power battery 12, and the power battery 12 is connected to the first motor controller 3.

[0030] Further, the structure further comprises a charger 13, an input end of the charger 13 is connected to an external power grid, and an output end of the charger 13 is connected to the power battery, the first motor controller 3 and the second motor controller 4.

[0031] Further, the structure further comprises an electrical auxiliary component 14 connected to the charger 13.

[0032] Compared with the existing structure, the hybrid power structure provided in the embodiment of the utility model reduces one engine and a post-processing system, and the chassis in the utility model is a pure electric chassis, and relevant new energy policies of the state can be enjoyed; the oil saving rate is high, and the fuel use cost is greatly reduced.

[0033] In the embodiment, the engine is coupled with one generator, serving as a range extender, when the engineering machinery is in a running condition, the range extender formed by the engine and the generator provides power for the chassis system;

[0034] When the engineering machinery is in a working condition, the range extender formed by the engine and the generator or the external power grid supplies power to the driving motor, and the driving motor provides power to the hydraulic pump through the PTO.

[0035] Further, the power supply method in the embodiment specifically comprises:

[0036] I. Running condition

[0037] The engine and the generator form a range extender, the clutch is separated, according to the SOC state and other parameters of the power battery, the range extender generates electricity according to the whole vehicle power request, and the running demand is met.

[0038] II. Parking working condition

[0039] When working, the clutch is combined, and the transmission is placed in neutral.

[0040] 1. Unavailable external power grid

[0041] 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 hydraulic pump 9 through the PTO 8 by the driving motor 5.

[0042] 1.2 The engine 1 and the generator 2 form a range extender to generate electricity, and the generated electricity is used to drive the hydraulic pump 9 through the PTO 8 by the driving motor 5, and the other part is used to charge the power battery 12.

[0043] 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 hydraulic pump 9 through the PTO 8 by the driving motor 5, and the insufficient part is supplemented by the power battery 12.

[0044] 1.4 The engine 1 and generator 2 constitute the range extender stop, drive motor 5 through the PTO 8 drive hydraulic pump 9, drive motor 5 power from the power battery 12.

[0045] 2, can connect external power grid

[0046] 2.1 The engine 1 and generator 2 constitute the range extender power generation, drive motor 5 through the PTO 8 drive hydraulic pump 9, drive motor 5 power through the charger 13 from the external power grid, the insufficient part is supplemented by the engine 1 and generator 2 constitute the range extender power generation.

[0047] 2.2 The engine 1 and generator 2 constitute the range extender stop, drive motor 5 through the PTO 8 drive hydraulic pump 9, drive motor 5 power through the charger 13 from the external power grid, the insufficient part is supplemented by the power battery 12.

[0048] 2.3 The engine 1 and generator 2 constitute the range extender stop, drive motor 5 through the PTO 8 drive hydraulic pump 9, drive motor 5 power through the charger 13 from the external power grid.

[0049] 2.4 The engine 1 and generator 2 constitute the range extender stop, drive motor 5 through the PTO 8 drive hydraulic pump 9, drive motor 5 power through the charger 13 from the external power grid; at the same time, the external power grid through the charger 13 to charge the power battery 12.

[0050] Three, working conditions in the running

[0051] When working in the running, the clutch is engaged, and the transmission is placed in the running demand gear.

[0052] 3.1 The engine 1 and generator 2 constitute the range extender power generation, the generated electricity is supplied to drive motor 5 through the transmission to drive axle 11, and at the same time, it is supplied to drive motor 5 through PTO 8 to drive hydraulic pump 9.

[0053] 3.2 The engine 1 and generator 2 constitute the range extender power generation, part of the generated electricity is supplied to drive motor 5 through the transmission to drive axle 11, part of the generated electricity is supplied to drive motor 5 through PTO 8 to drive hydraulic pump 9, and the other part is charged to power battery 12.

[0054] 3.3 The engine 1 and generator 2 constitute the range extender power generation, the generated electricity is supplied to drive motor 5 through the transmission to drive axle 11, and at the same time, it is supplied to drive motor 5 through PTO 8 to drive hydraulic pump 9, and the insufficient part is supplemented by the power battery 12.

[0055] 3.4 The range extender formed by the engine 1 and the generator 2 is stopped, the driving motor 5 drives the axle 11 through the transmission, the driving motor 5 drives the hydraulic pump 9 through the PTO 8, and the driving motor 5 is powered by the power battery 12.

[0056] The embodiment of the utility model through engine coupling 1 generator as range extender, when engineering machinery is in running condition, through engine and range extender formed by generator provide power for chassis system, when engineering machinery is in operation engineering, through engine and range extender formed by generator or external power grid power supply driving motor, so the utility model engineering machinery's electric energy supply can be according to the working environment in the vehicle-mounted range extender and external power grid flexible switching.

[0057] Note that the above is only the preferred embodiment of the utility model and the technical principle applied. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the utility model. Therefore, although the utility model has been described in more detail through the above embodiments, the utility model is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the utility model, and the scope of the utility model is determined by the appended claims.

Claims

1. A hybrid power structure for engineering machinery, characterized in that, include: Engine, generator, first motor controller, second motor controller, drive motor, gearbox, clutch, PTO, hydraulic pump, working device, and 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, which is connected to the first motor controller.

3. The structure according to claim 2, characterized in that, It also includes a charger, the input of which is connected to an external power grid, and the output of which is connected to the power battery, the first motor controller, and the second motor controller.

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