Hybrid system and work machine

Abstract

The utility model relates to the technical field of operation machinery, and discloses a hybrid power system and operation machinery. The hybrid power system comprises an engine, a clutch, a driving motor, a transmission, an axle, an energy storage device, an operation motor and a loading operation mechanism. The engine, the clutch, the driving motor, the transmission and the axle are sequentially connected; the energy storage device is electrically connected with the driving motor through the power distribution unit and the first motor control unit; the operation motor is electrically connected with the power distribution unit through the second motor control unit; the loading operation mechanism is connected with the operation motor; when the hybrid power system is in a hybrid power driving mode, a pure oil driving mode, a hybrid power operation mode or a pure oil operation mode, the clutch is closed; and when the hybrid power system is in a pure electric running mode or a pure electric working mode, the clutch is disconnected. The operation motor and the driving motor are mutually independent, the requirement for a power take-off port of a gearbox can be canceled, the traveling part and the operation part are independently selected and calibrated, and the model selection difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of work machinery technology, specifically to a hybrid power system and work machinery. Background Technology

[0002] As a tool for construction work, the development of cranes has been rapidly advancing. At the same time, emission requirements for construction machinery are becoming increasingly stringent. Under this major trend, new energy technologies in the crane machinery industry have become a hot topic.

[0003] Traditional lifting machinery typically relies on the engine to output energy, which is then transmitted to the hydraulic pump via a gearbox and power take-off. The hydraulic pump then outputs hydraulic energy to the actuator. This process involves multiple stages of transmission, resulting in high energy loss and significant noise from engine operation and gear meshing, impacting efficiency and operator experience. Furthermore, the engine does not operate in its high-efficiency range during operation, leading to low energy utilization, and engine emissions also pollute the environment. Utility Model Content

[0004] In view of this, the present invention provides a hybrid power system and a working machine to solve the problem that the power obtained by the working mechanism is limited by the power take-off port when the working mechanism obtains power through the power take-off port of the gearbox.

[0005] In a first aspect, this utility model provides a hybrid power system, comprising: an engine, a clutch, a drive motor, a transmission, an axle, an energy storage device, a work motor, and an on-board work mechanism; the engine, clutch, drive motor, transmission, and axle are connected in sequence; the energy storage device is electrically connected to the drive motor through a power distribution unit and a first motor control unit; the work motor is electrically connected to the power distribution unit through a second motor control unit; the on-board work mechanism is connected to the work motor; wherein, the hybrid power system has a hybrid driving mode, a pure electric driving mode, a pure gasoline driving mode, a pure electric work mode, a hybrid work mode, and a pure gasoline work mode; when the hybrid power system is in the hybrid driving mode, the pure gasoline driving mode, the hybrid work mode, or the pure gasoline work mode, the clutch is engaged; when the hybrid power system is in the pure electric driving mode or the pure electric work mode, the clutch is disengaged.

[0006] Beneficial effects: The working mechanism is driven by a working motor, and the axle is driven by a drive motor. Since the working motor and drive motor are independent, the requirement for a power take-off port in the gearbox is eliminated. This allows for separate selection and calibration of the traveling and working components, reducing selection difficulty, increasing matching accuracy, and decreasing the possibility of malfunctions. The crane can travel in hybrid, pure electric, and pure gasoline modes, offering advantages such as fuel efficiency, high performance, zero emissions, and worry-free range. The crane can operate in pure electric, hybrid, and pure gasoline modes, reducing energy consumption and achieving a green and environmentally friendly operation.

[0007] In one alternative implementation, the working motor is connected to the upper working mechanism via a hydraulic pump.

[0008] Beneficial effects: Precise control of the working mechanism is achieved by regulating oil pressure and flow through a hydraulic pump, providing smooth, continuously variable speed movement to meet the needs of different working conditions. Driving the upper working mechanism with a hydraulic pump enables rapid response to operating commands and provides immediate power output.

[0009] In one alternative implementation, the hybrid power system further includes outrigger cylinders, with a hydraulic pump connected to the outrigger cylinders.

[0010] Beneficial effects: The hydraulic pump not only provides hydraulic power for the upper working mechanism, but also provides hydraulic power for the outrigger cylinders, reducing the number of pumps, simplifying the system structure, and reducing the complexity of the system.

[0011] In one alternative implementation, the hybrid system further includes an on-board charger electrically connected to the power distribution unit.

[0012] Beneficial effects: When the work site has access to electricity, after inserting the charging gun from the external power source into the charging port of the vehicle-mounted charger, the power from the external power source is transmitted to the working motor, thereby driving the on-board working mechanism to perform operations. At the same time, the external power source can charge the energy storage device, making full use of the charging time and replenishing the battery's energy in a timely manner.

[0013] In one alternative implementation, the hybrid power system further includes a battery that is electrically connected to the power distribution unit via a DC-DC converter.

[0014] Beneficial effects: The battery provides power to the vehicle's low-voltage electrical system, ensuring the normal operation of the low-voltage electrical system.

[0015] In one alternative implementation, the hybrid system further includes a vehicle control unit, which is electrically connected to the engine, power distribution unit, first motor control unit, and second motor control unit.

[0016] Beneficial effects: The vehicle control unit is responsible for collecting data from various sensors and adjusting the system's operating status in real time based on driving conditions and driver commands, optimizing energy management and vehicle performance. It communicates and controls key components such as the engine, power distribution unit, first motor control unit, and second motor control unit via electrical connections, ensuring the efficient and safe operation of the entire system. The power distribution unit is responsible for safely and reliably distributing electrical energy from the high-voltage battery to various electrical devices and provides monitoring and protection functions.

[0017] The first motor control unit is responsible for controlling the drive motor and ensuring that it operates in accordance with the requirements of the vehicle control unit.

[0018] The second motor control unit is responsible for controlling the working motor and ensuring that it operates in accordance with the requirements of the vehicle control unit.

[0019] Secondly, this utility model also provides a working machine, including the aforementioned hybrid power system.

[0020] In one alternative embodiment, the working machinery includes an upper vehicle and an lower vehicle. The lower vehicle includes an engine, clutch, drive motor, gearbox, axle, energy storage device, power distribution unit, first motor control unit, working motor, and second motor control unit of a hybrid power system. The upper vehicle includes an upper working mechanism of a hybrid power system.

[0021] In one alternative implementation, the onboard working mechanism includes a slewing mechanism, a hoisting mechanism, a telescopic mechanism, and a luffing mechanism.

[0022] In one alternative implementation, the working machinery is a crane. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a structural block diagram of a hybrid power system according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Engine;

[0027] 2. Clutch;

[0028] 3. Drive motor;

[0029] 4. Transmission;

[0030] 5. Axles;

[0031] 6. Power battery;

[0032] 7. Operating motor;

[0033] 8. Hydraulic oil pump;

[0034] 901. Slewing motor; 902. Winch motor; 903. Telescopic cylinder; 904. Luffing cylinder;

[0035] 10. Power Distribution Unit

[0036] 11. On-board charger;

[0037] 12. First motor control unit;

[0038] 13. Second motor control unit;

[0039] 14. Outrigger cylinder;

[0040] 15. Storage battery;

[0041] 16. Vehicle control unit. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] In related technologies, traditional lifting machinery typically relies on engine power for energy output during operation. This energy is transmitted to the hydraulic pump via a gearbox and power take-off (PTO), and the hydraulic pump then supplies hydraulic energy to the actuator. This process involves multiple transmission stages, resulting in high energy loss and significant noise from engine operation and gear meshing, impacting efficiency and operator experience. Furthermore, the engine operates outside its high-efficiency range during operation, leading to low energy utilization, and engine emissions pollute the environment. Pure electric cranes are heavily influenced by battery performance, and are prone to battery depletion during travel or operation, resulting in range issues. Plug-in cranes are limited by plug-in conditions and have stringent environmental requirements for operation.

[0044] To solve the above problems, the following will be combined with... Figure 1 The following describes embodiments of the present invention.

[0045] According to an embodiment of this utility model, a hybrid power system is provided, comprising: an engine 1, a clutch 2, a drive motor 3, a transmission 4, an axle 5, an energy storage device, a work motor 7, and an on-board work mechanism; the engine 1, clutch 2, drive motor 3, transmission 4, and axle 5 are connected sequentially; the energy storage device is electrically connected to the drive motor 3 through a power distribution unit 10 and a first motor control unit 12; the work motor 7 is electrically connected to the power distribution unit 10 through a second motor control unit 13; the on-board work mechanism is connected to the work motor 7; wherein the hybrid power system has a hybrid driving mode, a pure electric driving mode, a pure gasoline driving mode, a pure electric work mode, a hybrid work mode, and a pure gasoline work mode; when the hybrid power system is in the hybrid driving mode, the pure gasoline driving mode, the hybrid work mode, or the pure gasoline work mode, the clutch 2 is engaged; when the hybrid power system is in the pure electric driving mode or the pure electric work mode, the clutch 2 is disengaged.

[0046] The hybrid power system of this embodiment drives the upper working mechanism via the working motor 7 and the axle 5 via the drive motor 3. The working motor 7 and the drive motor 3 are independent of each other, eliminating the need for a power take-off port in the gearbox. This allows for separate selection and calibration of the traveling and working components, reducing selection difficulty, increasing matching accuracy, and decreasing the likelihood of malfunctions. The crane can travel in hybrid, pure electric, or pure gasoline modes, offering advantages such as fuel efficiency, zero emissions, and worry-free range. Onboard operation can operate in pure electric, hybrid, or pure gasoline modes, reducing energy consumption and achieving a green and environmentally friendly approach.

[0047] In one embodiment, the working motor 7 is connected to the upper working mechanism via a hydraulic pump 8. The hydraulic pump 8 regulates oil pressure and flow to achieve precise control of the working mechanism, providing smooth, continuously variable speed motion to meet the needs of different working conditions. Driving the upper working mechanism with the hydraulic pump 8 enables rapid response to operating commands and provides immediate power output.

[0048] In one embodiment, the hybrid power system further includes outrigger cylinders 14, with a hydraulic pump 8 connected to the outrigger cylinders 14. The hydraulic pump 8 not only provides hydraulic power to the working mechanism but also to the outrigger cylinders 14, reducing the number of pumps, simplifying the system structure, and lowering the system complexity.

[0049] In one embodiment, the hybrid system further includes an on-board charger 11, which is electrically connected to the power distribution unit 10. When the work site has access to electricity, the charging gun from an external power source is inserted into the charging port of the on-board charger 11. Power from the external power source is then transmitted to the working motor 7, thereby driving the on-board working mechanism to perform its tasks. Simultaneously, the external power source can charge the energy storage device, making full use of the charging time to replenish the battery's energy in a timely manner.

[0050] It should be noted that the English abbreviation for On-board Charger 11 is OBC.

[0051] In one embodiment, the hybrid system further includes a battery 15, which is electrically connected to the power distribution unit 10 via a DC-DC converter. The battery 15 provides power to the vehicle's low-voltage electrical system, ensuring its normal operation.

[0052] In one embodiment, the hybrid system further includes a vehicle control unit 16, which is electrically connected to the engine 1, power distribution unit 10 (PDU), first motor control unit 12, and second motor control unit 13. The vehicle control unit 16 is responsible for collecting data from various sensors and adjusting the system's operating state in real time according to driving conditions and driver commands, optimizing energy management and vehicle performance. It communicates and controls key components such as the engine 1, power distribution unit 10, first motor control unit 12, and second motor control unit 13 via electrical connections to ensure the efficient and safe operation of the entire system. The power distribution unit 10 is responsible for safely and reliably distributing electrical energy from the high-voltage battery to various electrical devices and providing monitoring and protection functions. The first motor control unit 12 controls the drive motor 3, ensuring it operates according to the requirements of the vehicle control unit 16. The second motor control unit 13 controls the auxiliary motor 7, ensuring it operates according to the requirements of the vehicle control unit 16.

[0053] It should be noted that the English abbreviation for the vehicle control unit 16 is MCU, the English abbreviation for the motor control unit is MCU, the first motor control unit 12 can be called MCU1, and the second motor control unit 13 can be called MCU2.

[0054] In one embodiment, the energy storage device is a power battery 6, which has advantages such as long cycle life and environmental sustainability. It is understood that the power battery 6 can also be replaced with other energy storage devices, converting other forms of energy into electrical energy and storing it in the energy storage device.

[0055] According to an embodiment of the present invention, another aspect provides a working machine, including the aforementioned hybrid power system.

[0056] In one embodiment, the working machinery includes an upper vehicle and an lower vehicle. The lower vehicle includes a hybrid power system comprising an engine 1, a clutch 2, a drive motor 3, a gearbox, an axle 5, an energy storage device, a power distribution unit 10, a first motor control unit 12, a working motor 7, and a second motor control unit 13. The upper vehicle includes the upper vehicle working mechanism of the hybrid power system. The drive motor 3 is mainly used for lower vehicle travel and power generation, while the working motor 7 is mainly used for upper vehicle operation. The drive motor 3 and the working motor 7 are independent of each other; that is, the power components for upper vehicle operation and lower vehicle travel are independent of each other. The upper vehicle operation power is driven by the independent working motor 7, which is directly connected to the hydraulic oil pump 8, shortening the power transmission path. Furthermore, there is no limitation on the gearbox power take-off port, allowing application to more models. In the event of battery depletion, the engine 1 and drive motor 3 can perform range-extending power generation, improving power generation efficiency.

[0057] Furthermore, when the hybrid system uses engine 1 and power battery 6, a smaller engine 1 can be selected, reducing the power of engine 1 and achieving cost control, thereby saving costs. Engine 1 is connected to drive motor 3 via clutch 2, and drive motor 3 is connected to gearbox, which transmits power output to axle 5 for driving; power battery 6 provides energy to working motor 7 through PDU and MCU2, and working motor 7 drives hydraulic oil pump 8 to provide power for hydraulics, causing the working actuator to move; external power grid charges power battery 6 system through OBC and PDU; power battery 6 charges 24V storage battery 15 through PDU and DC-DC, thereby supplying power to low-voltage system.

[0058] In one embodiment, the overhead crane operating mechanism includes a slewing mechanism, a hoisting mechanism, a telescopic mechanism, and a luffing mechanism. The slewing mechanism includes a slewing motor 901 and a slewing bearing, etc., and is used to achieve 360-degree rotation of the overhead crane relative to the undercarriage, allowing the boom or hook to move freely in the horizontal plane and expand the working range. The hoisting mechanism includes a hoisting motor 902 and a drum, etc., and is responsible for lifting and lowering goods or the boom. The telescopic mechanism includes a telescopic cylinder 903, etc., and is used to change the length of the boom, expanding the working range, especially for flexible operation in confined spaces. The luffing mechanism includes a luffing cylinder 904, etc., and is used to adjust the angle of the boom, changing the working range and lifting height to ensure optimal working conditions under different operating circumstances.

[0059] It should be noted that the slewing mechanism, hoisting mechanism, telescopic mechanism, and luffing mechanism can all adopt the existing structures, and will not be described in detail here.

[0060] It is understood that in another embodiment, the working motor 7 and hydraulic oil pump 8 can be omitted, and the luffing cylinder 904, winch motor 902, and slewing motor 901 can be replaced with a luffing electric cylinder, winch motor, and slewing motor, that is, the upper hydraulic actuator can be changed to an electric actuator.

[0061] In one embodiment, the operating machinery is a crane, which adopts the aforementioned hybrid power system. This system enables hybrid driving mode, pure electric driving mode, and pure oil driving mode when the crane is off the vehicle. These modes provide advantages such as fuel efficiency, energy saving, zero emissions, and worry-free range when the crane is in operation. When the crane is on the vehicle, it can achieve the advantages of pure electric operation, plug-in operation, and range-extended power generation operation, thereby reducing energy consumption and achieving green and environmentally friendly characteristics.

[0062] The following describes the working mode of the crane:

[0063] When the user selects hybrid driving mode, the clutch 2 is engaged, and the power battery 6 provides energy to the drive motor 3. The engine 1 and the power battery 6 work together to power the disembarkation action. At the same time, during driving, the drive motor 3 can automatically adjust the output torque of the engine 1 based on driving conditions, the efficiency of the engine 1, and the charge level of the power battery 6, keeping the engine 1 operating within its high-efficiency range.

[0064] When the vehicle is driven, if the power battery 6 has enough power and is above a certain threshold, the user can select the pure electric driving mode. At this time, the clutch 2 is disengaged, the power battery 6 transmits energy to the drive motor 3, and through the gearbox, the power is transmitted to the axle 5 for driving.

[0065] When the user selects the pure gasoline driving mode, the power battery 6 does not provide energy to the drive motor 3. The engine 1 serves as the sole source of power for driving off the vehicle, providing power to the axle 5.

[0066] When the power battery 6 has sufficient charge and is above a certain threshold, the user can select the pure electric operation mode to operate on the vehicle. At this time, the power battery 6 provides energy to the working motor 7, and the working motor 7 drives the oil pump to provide power for the operation on the vehicle.

[0067] When the power battery 6 drops below the set threshold during onboard operation, the engine 1 drives the drive motor 3 to generate electricity, entering the hybrid operation mode, where the engine 1 drives the drive motor 3 to provide power to the onboard vehicle.

[0068] When the vehicle is in operation, if an external power grid is connected, the external power grid can directly provide power to the working motor 7 through OBC, PDU, and MCU2.

[0069] Furthermore, when the power battery 6 has a low charge level, the following charging modes can be implemented:

[0070] When an external power grid is connected, the external power grid charges the power battery 6 through the OBC and PDU;

[0071] When there is no external power grid connected, clutch 2 is closed, engine 1 drives drive motor 3 to generate electricity, and the electricity enters power battery 6 through MCU1 and PDU.

[0072] When the vehicle needs to brake, the axle 5 transmits the driving kinetic energy to the drive motor 3 through the gearbox. The drive motor 3 generates electricity, which is then charged into the power battery 6 through the MCU1 and PDU.

[0073] It is understood that in another embodiment, the operating machinery may also be a pile driver, a mixer, etc., and is not limited to this.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A hybrid power system, characterized in that, include: Engine (1), clutch (2), drive motor (3), transmission (4), axle (5), energy storage device, working motor (7) and on-board working mechanism; The engine (1), the clutch (2), the drive motor (3), the transmission (4), and the axle (5) are connected in sequence; The energy storage device is electrically connected to the drive motor (3) through a power distribution unit (10) and a first motor control unit (12); The working motor (7) is electrically connected to the power distribution unit (10) through the second motor control unit (13); The upper working mechanism is connected to the working motor (7); The hybrid power system has a hybrid driving mode, a pure electric driving mode, a pure gasoline driving mode, a pure electric operating mode, a hybrid operating mode, and a pure gasoline operating mode. When the hybrid system is in the hybrid driving mode, the pure oil driving mode, the hybrid operation mode or the pure oil operation mode, the clutch (2) is closed; When the hybrid system is in the pure electric driving mode or the pure electric operation mode, the clutch (2) is disengaged.

2. The hybrid power system according to claim 1, characterized in that, The working motor (7) is connected to the upper working mechanism via a hydraulic oil pump (8).

3. The hybrid power system according to claim 2, characterized in that, The hybrid power system also includes outrigger cylinders (14), and the hydraulic pump (8) is connected to the outrigger cylinders (14).

4. The hybrid power system according to any one of claims 1 to 3, characterized in that, The hybrid power system also includes an on-board charger (11) which is electrically connected to the power distribution unit (10).

5. The hybrid power system according to any one of claims 1 to 3, characterized in that, The hybrid power system also includes a battery (15) which is electrically connected to the power distribution unit (10) via a DC-DC converter.

6. The hybrid power system according to any one of claims 1 to 3, characterized in that, The hybrid power system also includes a vehicle control unit (16), which is electrically connected to the engine (1), the power distribution unit (10), the first motor control unit (12), and the second motor control unit.

7. A type of operating machinery, characterized in that, include: The hybrid power system according to any one of claims 1 to 6.

8. The operating machinery according to claim 7, characterized in that, The working machinery includes an upper vehicle and an lower vehicle. The lower vehicle includes the engine (1), clutch (2), drive motor (3), gearbox, axle (5), energy storage device, power distribution unit (10), first motor control unit (12), working motor (7), and second motor control unit (13) of the hybrid power system. The upper vehicle includes the upper working mechanism of the hybrid power system.

9. The operating machinery according to claim 8, characterized in that, The overhead working mechanism includes a slewing mechanism, a hoisting mechanism, a telescopic mechanism, and a luffing mechanism.

10. The operating machinery according to claim 9, characterized in that, The operating machinery is a crane.

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