Dual-power excavator control system and excavator

Abstract

The utility model discloses a dual-power excavator control system and excavator, the dual-power excavator control system includes: an air-conditioning system, the air-conditioning system includes a refrigeration system and a heating system, the heating system includes a warm water tank for holding warm water for providing heat, the refrigeration system includes an air-conditioning compressor for compressing and driving a refrigerant; the power system comprises an engine and a motor, the output end of the engine is in on-off connection with the input end of the motor, the output end of the motor is connected with the air conditioner compressor, and the engine is provided with a cooling device for containing cooling water; the WPTC is used for containing and heating water to form warm water for providing heat, and the warm water tank is communicated with the WPTC or the cooling device; and the power supply is electrically connected with the WPTC and the motor. Refrigeration and heating of the air conditioner can be achieved in the oil-electricity power mode, so that the comfort degree in a cab can be kept, and the working environment of a driver is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a dual-power excavator control system and an excavator. Background Art

[0002] As a kind of engineering machinery widely used in roads, mining and infrastructure, excavators have sufficient market demand. This not only promotes the development of excavator manufacturers, but also prompts the continuous emergence of excavator products with superior performance in the market. The entire excavator industry presents an attitude of a hundred schools of thought contending and a hundred flowers blooming.

[0003] Currently, excavators are primarily powered by diesel engines. The noise and emissions from diesel engines are environmentally polluting, and diesel, a non-renewable resource, has seen its price rise, significantly increasing excavator operating costs. Consequently, with China's support for the development of new energy sources, there's a desire for excavators powered by electricity. However, many work sites lack power, making it difficult to operate with a towed power source. Relying solely on batteries makes it difficult to maintain sustained operation. Consequently, a dual-powered excavator has emerged.

[0004] Prior art CN113089741A discloses a dual-power excavator whose power structure includes a diesel engine and an electric motor. This utilizes two types of power in series, oil and electricity, and automatically switches between power sources. The electric motor is used when electricity is available, and the diesel engine is used when electricity is not. This significantly reduces noise and pollutant emissions, thereby significantly lowering the excavator's operating costs. To maintain comfort in the cab, this dual-power excavator is typically equipped with an air conditioning system consisting of a cooling system and a heating system, with the heating system receiving heat from the diesel engine's cooling water. However, this system is only suitable for use with a diesel engine as the power source; air conditioning and heating are not possible when the electric motor is used as the power source. Utility Model Content

[0005] In order to overcome at least one of the defects of the prior art described above, the purpose of the present invention is to provide a dual-power excavator control system and an excavator, so as to realize cooling and heating of the air conditioner in both oil-electric power modes.

[0006] The technical solution adopted by the present invention to solve the problem is:

[0007] A dual-power excavator control system, comprising:

[0008] Air conditioning system, the air conditioning system includes a refrigeration system and a heating system. The heating system includes a warm water tank to hold warm water that provides heat, and the refrigeration system includes an air conditioning compressor to compress and drive the refrigerant;

[0009] The power system includes an engine and an electric motor. The output end of the engine is connected to the input end of the electric motor in an on-off manner. The output end of the electric motor is connected to the air-conditioning compressor. The engine is provided with a cooling device for holding cooling water.

[0010] WPTC, WPTC is used to contain and heat water to form warm water that provides heat, and the warm water tank is connected to the WPTC or the cooling device;

[0011] A power supply electrically connects the WPTC and the motor.

[0012] As a preferred embodiment, in the present invention, the output end of the engine is connected to the input end of the electric motor in an on-off manner via a clutch actuator.

[0013] As a preferred embodiment, in the present invention, the output end of the electric motor is also connected to a hydraulic fan and a working device, and the hydraulic fan, the working device and the air-conditioning compressor are connected in parallel to the output end of the electric motor.

[0014] As a preferred embodiment, in the present invention, the output end of the motor is connected to the input end of the main pump, the input end and the working device of the auxiliary pump are connected in parallel to the output end of the main pump, and the hydraulic fan and the air-conditioning compressor are connected in parallel to the output end of the auxiliary pump.

[0015] As a preferred embodiment, in the present invention, the control system is provided with a VCU and a display, and the VCU is electrically connected to the power supply and the display.

[0016] As a preferred embodiment, in the present invention, the warm water tank is connected to the WPTC and the cooling device via an electrically controlled three-way switch valve, and the electrically controlled three-way switch valve is electrically connected to the VCU.

[0017] As a preferred embodiment, in the present invention, the control system further includes a switch button to switch the working mode of the power system, and the switch button is electrically connected to the VCU.

[0018] As a preferred embodiment, in the present invention, the power supply includes a transformer, a rectifier cabinet, a step-down transformer and an all-in-one controller connected in series in sequence, the transformer is electrically connected to the power grid, the output end of the all-in-one controller is respectively connected to the WPTC, the motor and the battery, and the battery is electrically connected to the VCU and the display.

[0019] As a preferred embodiment, in the present invention, a conductive ring is provided between the rectifier cabinet and the step-down transformer.

[0020] The utility model also provides an excavator, comprising: the above-mentioned dual-power excavator control system.

[0021] The dual-power excavator control system and the excavator provided by the utility model have the following beneficial effects:

[0022] 1) By connecting the warm water tank to the WPTC or cooling unit, the cooling water in the cooling unit serves as the warm water source when the engine is the power source, while the water heated by the WPTC serves as the warm water source when the electric motor is the power source. Furthermore, the air conditioning compressor can be driven by either the engine or the electric motor. This control system can achieve both cooling and heating in both hybrid and electric power modes.

[0023] 2) The excavator has a dual-power control system that can flexibly switch between oil-electric power modes according to the work site, combining the advantages of low cost, long-term operation, and convenient mobility; and the air-conditioning system can achieve cooling and heating in either power mode, thereby maintaining the comfort level in the cab and improving the driver's working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the control system of the dual-power excavator of the present utility model;

[0025] Figure 2 This is a flow chart of the dual power switching mode of the present invention.

[0026] The meanings of the reference numerals are as follows:

[0027] 1. Air conditioning compressor; 2. Engine; 3. Electric motor; 4. WPTC; 5. Clutch actuator; 6. Hydraulic fan; 7. Working device; 8. Main pump; 9. Auxiliary pump; 10. VCU; 11. Display; 12. Electronically controlled three-way switching valve; 13. Switch button; 14. Transformer; 15. Rectifier cabinet; 16. Voltage reducer; 17. All-in-one controller; 18. Battery; 19. Conductive ring. DETAILED DESCRIPTION

[0028] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Example 1

[0032] See Figure 1 This embodiment provides a dual-power excavator control system, comprising an air conditioning system, a power system, a WPTC4, and a power supply. The air conditioning system includes a cooling system and a heating system. The heating system includes a warm water tank to hold warm water for heat generation, and the cooling system includes an air conditioning compressor 1 to compress and drive the refrigerant. The power system includes an engine 2 and an electric motor 3. The output of the engine 2 is operably connected to the input of the electric motor 3. The output of the electric motor 3 is connected to the air conditioning compressor 1. The engine 2 is equipped with a cooling device to hold cooling water. The WPTC4 is used to hold and heat water to form warm water for heat generation. The warm water tank is connected to the WPTC4 or the cooling device. The power supply is electrically connected to the WPTC4 and the electric motor 3.

[0033] Specifically, the air conditioning refrigeration system uses the air conditioning compressor 1 to compress the gaseous refrigerant into a high-temperature, high-pressure gas, which is then transported to the condenser for heat exchange with the air to release a large amount of heat, thereby converting it into a liquid refrigerant at room temperature and high pressure. It then passes through the throttling device and becomes a low-temperature, low-pressure gas-liquid mixture. Finally, it enters the evaporator to absorb the heat of the air and become a low-temperature, low-pressure gas, thereby cooling the air to achieve the purpose of cooling.

[0034] Air conditioning compressor 1 is driven by a power system. The power system has two power modes. In the first mode, when motor 3 is connected to a power source, motor 3 is disconnected from engine 2, engine 2 is not started, and motor 3 drives air conditioning compressor 1. In the second mode, when motor 3 is not connected to a power source, motor 3 is connected to engine 2, and engine 2 is started, driving air conditioning compressor 1 via motor 3. In this way, air conditioning compressor 1 can be operated in both power modes, facilitating cooling by the refrigeration system.

[0035] The air conditioning heating system utilizes warm water in a warm water tank to heat the air. When engine 2 is used as the power source, its operation heats the cooling water in the cooling unit, creating warm water. The cooling unit is connected to the warm water tank via a pipeline, allowing the warm water to be drawn into the tank to heat the air. When motor 3 is used as the power source, a disconnect device is provided between the cooling unit and the warm water tank. WPTC4, which acts as a heater to heat the water, is connected to the warm water tank, allowing the warm water to be drawn into the tank to heat the air.

[0036] Based on this, this embodiment connects the warm water tank to the WPTC 4 or the cooling device. When the engine 2 is the power source, the cooling water in the cooling device serves as the warm water source. When the motor 3 is the power source, the water heated by the WPTC 4 serves as the warm water source. Furthermore, regardless of whether the engine 2 or the motor 3 is the power source, the air conditioning compressor 1 can be driven. In this way, the control system can achieve both cooling and heating of the air conditioning system in both oil-electric and electric power modes.

[0037] The control system of this embodiment is described in detail below:

[0038] The output of engine 2 is connected to the input of motor 3 via clutch actuator 5. When clutch actuator 5 is engaged, engine 2 and motor 3 are connected, with engine 2 acting as the power source. When clutch actuator 5 is disengaged, engine 2 and motor 3 are disconnected, and power is supplied to motor 3 via the power supply, making motor 3 the power source.

[0039] Whether the power source is engine 2 or electric motor 3, in addition to controlling the operation of the air conditioning compressor 1, the output of electric motor 3 is also connected to a hydraulic fan 6 and a working device 7. The hydraulic fan 6, working device 7, and air conditioning compressor 1 are connected in parallel to the output of electric motor 3. The hydraulic fan 6, working device 7, and air conditioning compressor 1 can operate simultaneously, or one or both can be activated as needed. The hydraulic fan 6 can be operated in less-than-warm weather to provide a cooler environment. This dual-power system not only provides cooling or heating, but also drives the excavator for operations, providing diverse functionality.

[0040] Power is transmitted between the motor 3 and the hydraulic fan 6, working device 7, and air conditioning compressor 1 via a drive pump. The output of the motor 3 is connected to the input of the main pump 8. The input of the auxiliary pump 9 and the working device 7 are connected in parallel to the output of the main pump 8. The hydraulic fan 6 and air conditioning compressor 1 are connected in parallel to the output of the auxiliary pump 9. In this way, the main pump 8 primarily drives the operation of the working device 7, while the hydraulic fan 6 and air conditioning compressor 1 are driven by the auxiliary pump 9, thus rationally distributing the driving force.

[0041] Based on the above structure, the control system of this embodiment is in automatic control mode. The control system includes a VCU 10 and a display 11. The VCU 10 is electrically connected to a power supply and the display 11. Thus, the power supply supplies power to the VCU 10 and the display 11. The VCU 10 serves as the whole machine controller, controlling the entire excavator system and displaying the excavator's operating status on the display 11 for the operator to understand in real time.

[0042] To this end, the warm water tank is connected to the WPTC4 and the cooling unit via an electrically controlled three-way on-off valve 12, which is electrically connected to the VCU 10. When the motor 3 is used as the power source, the VCU 10 connects ports V1 and V2 of the three-way on-off valve 12. When heating is required, the VCU 10 activates the WPTC4 to heat water and delivers it to the warm water tank for air heating. When the engine 2 is used as the power source, the VCU 10 connects ports V1 and V3 of the three-way on-off valve 12. When heating is required, the VCU 10 activates the engine 2 and directs heated water from the cooling unit to the warm water tank for air heating.

[0043] The control system also includes a switch button 13 to switch the working mode of the power system. The switch button 13 is electrically connected to the VCU 10. Therefore, pressing the switch button 13 can change the power source, which is convenient and quick.

[0044] The power supply consists of a transformer 14, a rectifier 15, a voltage step-down device 16, and an all-in-one controller 17, connected in series. Transformer 14 is electrically connected to the power grid. The output of all-in-one controller 17 is connected to WPTC 4, motor 3, and battery 18, respectively. Battery 18 is electrically connected to VCU 10 and display 11. A conductive ring 19 is provided between rectifier 15 and voltage step-down device 16. Transformer 14 connects to the power grid to convert 380VAC power to 690VAC power. Rectifier 15 then converts the 690VAC power to 1000VDC power. This voltage increase to 1000VDC effectively reduces the wire diameter of the connecting cables, facilitating the movement of the entire machine. Conductive ring 19 connects the power supply between the upper traveling mechanism and the upper slewing platform of the dual-power excavator. Voltage step-down device 16 reduces the 1000VDC power to 600VDC to power the vehicle's electronic control components. All-in-one controller 17 distributes power to motor 3, WPTC 4, and battery 18. Specifically, all-in-one controller 17 powers motor 3 and WPTC 4. Battery 18 is a 24V battery. A step-down DC-DC converter is included within all-in-one controller 17, which reduces the 600VDC power supply to 27VDC to charge battery 18. Battery 18 is used to power VCU 10 and display 11.

[0045] Example 2

[0046] This embodiment provides an excavator, including the dual-power excavator control system of embodiment 1.

[0047] The excavator's power system includes both a tow mode (powered by electric motor 3) and an engine mode (powered by engine 2). The tow mode uses grid power as its energy source, converting 380VAC to 690VAC, which is then rectified to 1000VDC. This voltage is then reduced to 600VDC by a step-down transformer 16 at the vehicle's end. This mode offers unlimited battery life, reducing operating costs. The engine mode, powered by diesel, is primarily intended for use in off-grid environments, light-load operations, or when relocating the entire vehicle to a worksite.

[0048] Specifically, the switching process between engine mode and towing mode can be found in Figure 2 :

[0049] The engine mode switching process is as follows: when the VCU 10 receives a signal from the switch button 13 to switch to engine mode, it determines whether the vehicle is already started. If so, it does not respond to the signal from the switch button 13. If not, it determines whether the clutch actuator 5 is engaged. If so, it indicates that the vehicle is in engine mode. If the clutch actuator 5 is disengaged, it initiates a command to unlock the locking solenoid valve. After the locking solenoid valve is unlocked, it drives the clutch motor forward until the clutch actuator 5 is engaged. Once the clutch actuator 5 is engaged, the clutch motor is stopped and the locking solenoid valve is commanded to lock, maintaining the clutch actuator 5 in this state. Once the locking solenoid valve is determined to be locked, the engine mode switch is complete.

[0050] The process for switching to towing mode is as follows: when the VCU 10 receives a signal from the toggle button 13 to switch to towing mode, it determines whether the vehicle is already started. If so, it does not respond to the signal from the toggle button 13. If not, it determines whether the clutch actuator 5 is disengaged. If so, it indicates towing mode. If the clutch actuator 5 is engaged, it initiates a command to unlock the locking solenoid valve. Once the locking solenoid valve is unlocked, it drives the clutch motor in the reverse direction until the clutch actuator 5 is disengaged. Once the clutch actuator 5 is disengaged, the clutch motor is stopped and the locking solenoid valve is commanded to lock, maintaining the clutch actuator 5 in this state. Once the locking solenoid valve is determined to be locked, the towing mode switch is complete.

[0051] After the excavator's power mode is switched, the VCU 10 transmits the vehicle's power mode status to the display 11 , which switches to the corresponding UI interface according to the power mode status, so that the driver can understand the excavator's operating status.

[0052] In this way, the excavator of this embodiment has a dual power control system, which can flexibly switch between oil and electric power modes according to the work site, so as to have the advantages of low cost, long-term operation, and convenient mobility; and, in any power mode, the air-conditioning system can realize cooling and heating, thereby maintaining the comfort in the cab and improving the driver's working environment.

[0053] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A dual-power excavator control system, characterized in that: include: An air conditioning system, the air conditioning system comprising a refrigeration system and a heating system, the heating system comprising a warm water tank for holding warm water providing heat, and the refrigeration system comprising an air conditioning compressor for compressing and driving a refrigerant; A power system comprising an engine and an electric motor, wherein an output end of the engine is connectable to an input end of the electric motor, the output end of the electric motor is connected to the air-conditioning compressor, and the engine is provided with a cooling device for containing cooling water; WPTC, the WPTC is used to contain and heat water to form warm water that provides heat, the warm water tank is connected to the WPTC or the cooling device; A power supply electrically connects the WPTC and the electric motor.

2. The dual-power excavator control system according to claim 1, characterized in that: The output end of the engine is connected to the input end of the electric motor in an on-off manner via a clutch actuator.

3. The dual-power excavator control system according to claim 1, characterized in that: The output end of the electric motor is also connected to a hydraulic fan and a working device. The hydraulic fan, the working device and the air-conditioning compressor are connected in parallel to the output end of the electric motor.

4. The dual-power excavator control system according to claim 3, characterized in that: The output end of the electric motor is connected to the input end of the main pump, the output end of the main pump is connected to the input end of the working device and the auxiliary pump, and the hydraulic fan and the air-conditioning compressor are connected in parallel to the output end of the auxiliary pump.

5. The dual-power excavator control system according to any one of claims 1 to 4, characterized in that: The control system is provided with a VCU and a display, and the VCU is electrically connected to the power supply and the display.

6. The dual-power excavator control system according to claim 5, characterized in that: The warm water tank is connected to the WPTC and the cooling device via an electrically controlled three-way switch valve, and the electrically controlled three-way switch valve is electrically connected to the VCU.

7. The dual-power excavator control system according to claim 5, characterized in that: The control system further includes a switch button for switching the working mode of the power system, and the switch button is electrically connected to the VCU.

8. The dual-power excavator control system according to claim 5, characterized in that: The power supply includes a transformer, a rectifier cabinet, a step-down transformer and an all-in-one controller connected in series in sequence. The transformer is electrically connected to the power grid. The output end of the all-in-one controller is respectively connected to the WPTC, the motor and the battery. The battery is electrically connected to the VCU and the display.

9. The dual-power excavator control system according to claim 8, characterized in that: A conductive ring is provided between the rectifier cabinet and the step-down transformer.

10. An excavator, characterized in that: include: The dual-power excavator control system according to any one of claims 1 to 9.

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