Hybrid power loader

Abstract

The utility model relates to a hybrid power loader which comprises a whole vehicle controller, an engine, a first motor, a second motor, a hydraulic pump set, a hydraulic system, a drive control system, an energy storage system and a chassis walking system, and an output shaft of the engine is connected with one end of a rotating shaft of the first motor; the hydraulic pump set comprises at least two oil pumps, rotating shafts of the oil pumps are sequentially connected in series, and the other end of the rotating shaft of the first motor is in transmission connection with the rotating shaft of the oil pump close to the first motor. The hydraulic pump set is connected with the hydraulic system; the first motor and the second motor are both electrically connected with the drive control system, the drive control system is electrically connected with the energy storage system, and the second motor drives the chassis walking system to move. The vehicle control unit is in communication connection with the engine, the drive control system and the energy storage system, and in addition, the vehicle control unit is in electric connection or communication connection with the hydraulic system. The utility model has the advantages of energy conservation, environmental protection, low noise, efficient and stable operation and strong applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of loaders, in particular to a hybrid power loader. Background Art

[0002] A loader is a type of earthwork construction machinery widely used in construction projects such as roads, railways, buildings, hydropower, ports, and mines. Traditional loaders usually use internal combustion engines as their power source, which are powerful and easy to recharge, but have high fuel consumption and low energy efficiency. Under different workloads, it is difficult for the internal combustion engine to always maintain its optimal working state, resulting in high emissions and greater pressure on the environment. In addition, under low-load conditions, the internal combustion engine of a fuel loader still needs to continue to operate, resulting in unnecessary energy waste. At present, pure electric loaders have also appeared on the market, which have high energy utilization efficiency, low noise, and good environmental performance, but there are problems with long cruising range and recharging time. With the continuous improvement of environmental protection requirements and the increasingly severe energy crisis, the research and development of energy-saving and environmentally friendly hybrid loaders has important practical significance. Utility Model Content

[0003] The utility model aims to provide a hybrid power loader, which has the advantages of energy saving and environmental protection, low noise, efficient and stable operation and strong applicability.

[0004] To achieve the above-mentioned purpose, the utility model discloses a hybrid power loader, which includes: a vehicle controller, an engine, a first motor, a second motor, a hydraulic pump group, a hydraulic system, a drive control system, an energy storage system and a chassis travel system, wherein the output shaft of the engine is connected to one end of the rotating shaft of the first motor; the hydraulic pump group includes at least two oil pumps, the rotating shafts of the oil pumps are sequentially connected in series, and the other end of the rotating shaft of the first motor is drivingly connected to the rotating shaft of the oil pump close to it; the hydraulic pump group is connected to the hydraulic system; the first motor and the second motor are both electrically connected to the drive control system, the drive control system is electrically connected to the energy storage system, and the second motor drives the chassis travel system to move; the vehicle controller is communicatively connected to the engine, the drive control system and the energy storage system, and in addition, the vehicle controller is electrically or communicatively connected to the hydraulic system.

[0005] Through the above settings, different working modes can be executed according to different working conditions of the loader. For example, under low-speed, light-load and other working conditions, the second motor drives the loader to travel and / or the first motor drives the hydraulic pump group to work, and the engine stops to achieve zero emissions; under low-speed and high-torque working conditions, the engine and the first motor jointly drive the hydraulic pump group to work, thereby improving working efficiency; under high-speed driving conditions, the engine drives the first motor to generate electricity, providing the second motor with the required electric energy to realize the driving of the loader, and the surplus electric energy is stored in the energy storage system; during deceleration and braking, the second motor converts kinetic energy into electric energy, which is stored in the energy storage system to achieve energy recovery. In summary, the utility model can reduce the energy consumption of the engine, reduce emission pollution, and be more energy-saving and environmentally friendly. By setting different working modes, it can cope with different working conditions, has high working efficiency, stable power output, strong applicability, low noise level, and better operating comfort.

[0006] Preferably, the output shaft of the engine is connected to the rotating shaft of the first motor via a torque damper or an elastic coupling.

[0007] Preferably, the hydraulic system includes a working hydraulic system, a steering hydraulic system and a priority valve, and the two oil pumps in the hydraulic pump group are defined as a first oil pump and a second oil pump, respectively. The first oil pump is connected to the working hydraulic system via a pipeline, and the second oil pump is connected to the steering hydraulic system and the working hydraulic system via a priority valve pipeline. With this arrangement, the second oil pump can cooperate with the first oil pump to serve the working hydraulic system, thereby improving the efficiency of the working hydraulic system.

[0008] Preferably, the energy storage system includes an energy storage unit, a BMS and a high-voltage box, wherein the high-voltage box is electrically connected to the energy storage unit and the drive control system, and the BMS is connected to the high-voltage box and the energy storage unit. The high-voltage box usually includes a high-voltage circuit and a corresponding circuit management system, and its main function is to convert and stabilize electric energy to ensure the stability of the electric energy input to the energy storage unit or output to the drive control system.

[0009] Preferably, the energy storage unit is a supercapacitor or a lithium battery or a sodium battery.

[0010] Preferably, the chassis travel system includes a frame, a gearbox, a gearbox control unit, a front drive axle and a rear drive axle, the gearbox has an input shaft, a first output shaft and a second output shaft, the first output shaft is connected to the front drive axle by driving, the second output shaft is connected to the rear drive axle by driving, and wheels are arranged at both ends of the front drive axle and the rear drive axle; the input shaft of the gearbox is connected to the second motor by driving; the gearbox control unit is used to control the gearbox to switch gears, and the gearbox control unit is connected to the vehicle controller by communication. The power output by the second motor is transmitted to the drive axle through the gearbox, thereby driving the loader to travel, and the gearbox control unit controls the gearbox to switch gears, so that the loader can adapt to different working conditions to travel.

[0011] Preferably, the communication connection mode between the vehicle controller and the engine, drive control system and energy storage system is CAN network communication. Such a setting can ensure stable communication between these devices and systems, and ensure the timeliness and stability of control.

[0012] Preferably, the vehicle further comprises a control system, which comprises an operating handle, a brake pedal, an accelerator pedal and a steering wheel, and the operating handle, the brake pedal, the accelerator pedal and the steering wheel are all connected to a vehicle controller. The vehicle controller collects operating signals, brake signals, acceleration signals and steering signals, and then issues instructions to corresponding functional components or systems, which has a high degree of integration and is conducive to the comprehensive control of the whole machine.

[0013] Preferably, an auxiliary system is also included, and the auxiliary system includes a low-voltage battery, a PTC heater, an air conditioning compressor and an air pump, and the low-voltage battery, the PTC heater, the air conditioning compressor and the air pump are all connected to the drive control system. The auxiliary system is connected to the drive control system, that is, the power conversion devices of various parts of the auxiliary system are integrated into the drive control system, such as setting a DC / DC in the drive control system to convert high-voltage direct current into low-voltage direct current to supply the low-voltage battery. Such a setting can make these power conversion devices integrated, which is conducive to reducing the space occupied by the equipment.

[0014] The utility model has the following beneficial effects:

[0015] The utility model can execute different working modes according to different working conditions of the loader. For example, under low-speed and light-load working conditions, the second motor drives the loader to travel and / or the first motor drives the hydraulic pump group to work, and the engine is stopped to achieve zero emissions; under low-speed and high-torque working conditions, the engine and the first motor jointly drive the hydraulic pump group to work, thereby improving working efficiency; under high-speed driving conditions, the engine drives the first motor to generate electricity, providing the second motor with the required electric energy to realize the driving of the loader, and the surplus electric energy is stored in the energy storage system; during deceleration and braking, the second motor converts kinetic energy into electric energy, which is stored in the energy storage system to achieve energy recovery. In summary, the utility model can reduce the energy consumption of the engine, reduce emission pollution, and be more energy-saving and environmentally friendly. By setting different working modes, it can cope with different working conditions, has high working efficiency, stable power output, strong applicability, low noise level, and better operating comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the utility model.

[0017] Figure 2 This is the energy trend diagram of the utility model in EV mode.

[0018] Figure 3 This is the energy trend diagram of the utility model in parallel mode.

[0019] Figure 4 This is the energy trend diagram of the utility model in series mode.

[0020] Figure 5 This is the energy trend diagram of the utility model in energy recovery mode.

[0021] Figure 6 This is the energy trend diagram of the utility model in the idle mode.

[0022] Main component symbols:

[0023] Gearbox 11, gearbox control unit 12, front drive axle 13, rear drive axle 14;

[0024] Vehicle controller 21, first motor 22, second motor 23, CAN network communication system 24, engine 25, ECU 26;

[0025] A first oil pump 31, a second oil pump 32, a working hydraulic system 33, a steering hydraulic system 34, and a priority valve 35;

[0026] An operating handle 41, a brake pedal 42, and an accelerator pedal 43;

[0027] Drive control system 50;

[0028] Energy storage system 60, energy storage unit 61, BMS 62, high voltage box 63;

[0029] Auxiliary system 70, low voltage battery 71, PTC heater 72, air conditioning compressor 73, air pump 74. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] like Figures 1 to 6 As shown, the utility model discloses a hybrid power loader, which includes: a vehicle controller 21, an engine 25, a first motor 22, a second motor 23, a hydraulic pump group, a hydraulic system, a drive control system 50, an energy storage system 60, a chassis travel system, a control system, an auxiliary machine system 70 and a CAN network communication system 24.

[0032] The chassis travel system includes a frame, a gearbox 11, a gearbox control unit 12, a front drive axle 13 and a rear drive axle 14. The gearbox 11 has an input shaft, a first output shaft and a second output shaft. The first output shaft is connected to the front drive axle 13 by transmission, and the second output shaft is connected to the rear drive axle 14 by transmission. The transmission connection mode can be a universal joint connection. Wheels are provided at both ends of the front drive axle 13 and the rear drive axle 14. The input shaft of the gearbox 11 is connected to the second motor 23 by transmission, and the second motor 23 is electrically connected to the drive control system 50. The gearbox control unit 12 is used to control the gearbox 11 to switch gears. The gearbox control unit 12 is connected to the vehicle controller 21 through the CAN network communication system 24. The power output by the second motor 23 is transmitted to the drive axle through the gearbox 11, thereby driving the loader to travel. The gearbox control unit 12 controls the gearbox 11 to switch gears, so that the loader can adapt to different working conditions.

[0033] The output shaft of the engine 25 is connected to one end of the rotating shaft of the first motor 22 through a torque damper or an elastic coupling, and the contact electrode of the first motor 22 is connected to the drive control system 50. In addition, the engine 25 is usually integrated with an ECU 26 (engine 25 control system), and the ECU 26 is connected to the vehicle controller 21 through the CAN network communication system 24.

[0034] The hydraulic pump group includes a first oil pump 31 and a second oil pump 32. The rotating shafts of the first oil pump 31 and the second oil pump 32 are connected in series in sequence. The other end of the rotating shaft of the first motor 22 is drivingly connected to the rotating shaft of the first oil pump 31. The hydraulic system includes a working hydraulic system 33, a steering hydraulic system 34 and a priority valve 35. The working hydraulic system 33 is used for the operation needs of the loader, and the steering hydraulic system 34 is used for steering assistance when the loader is moving. The first oil pump 31 is connected to the working hydraulic system 33 through a pipeline to pass hydraulic power, and the second oil pump 32 is connected to the steering hydraulic system 34 and the working hydraulic system 33 through a pipeline of the priority valve 35. After this arrangement, the second oil pump 32 can cooperate with the first oil pump 31 to serve the working hydraulic system 33, thereby improving the efficiency of the working hydraulic system 33.

[0035] The control system includes an operating handle 41, a brake pedal 42, an accelerator pedal 43 and a steering wheel. The operating handle 41, the brake pedal 42, the accelerator pedal 43 and the steering wheel are all connected to the vehicle controller 21. The vehicle controller 21 is connected to the hydraulic system by electrical connection or communication connection. The operating handle 41 is used to issue operating instructions to control the action of the working hydraulic system 33, and the brake pedal 42, the accelerator pedal 43 and the steering wheel respectively give brake signals, acceleration signals and steering signals. The control system is connected to the vehicle controller 21, and the vehicle controller 21 issues instructions to the corresponding functional devices or systems. It has a high degree of integration and is conducive to the comprehensive control of the whole machine. Of course, the steering wheel can also be directly connected to the steering hydraulic system 34.

[0036] The drive control system 50 is electrically connected to the energy storage system 60, and the drive control system 50 is also connected to the vehicle controller 21 through the CAN network communication system 24. The energy storage system 60 is a prior art, and the energy storage system 60 issued by the battery factory includes an energy storage unit 61, a BMS 62 and a high-voltage box 63, and the energy storage unit 61 is a supercapacitor or a lithium battery or a sodium battery. The high-voltage box 63 electrically connects the energy storage unit 61 and the drive control system 50, and the BMS 62 connects the high-voltage box 63 and the energy storage unit 61. The high-voltage box 63 usually includes a high-voltage circuit and a corresponding circuit management system, and its main function is to convert and stabilize electric energy to ensure the stability of the electric energy input to the energy storage unit 61 or output to the drive control system 50.

[0037] In this case, the auxiliary system 70 includes a low-voltage battery 71, a PTC heater 72, an air conditioning compressor 73, and an air pump 74, etc. The low-voltage battery 71, the PTC heater 72, the air conditioning compressor 73, and the air pump 74 are all connected to the drive control system 50. The auxiliary system 70 is connected to the drive control system 50, that is, the power conversion devices of various parts of the auxiliary system 70 are integrated into the drive control system 50. For example, a DC / DC is set in the drive control system 50 to convert high-voltage direct current into low-voltage direct current to supply the low-voltage battery 71. Such a setting can make these power conversion devices integrated, which is conducive to reducing the space occupied by the equipment, and can also centrally manage the electrical equipment on the loader, which is conducive to the reasonable distribution of electric energy.

[0038] The loader of the utility model can execute different working modes when dealing with different working conditions, as follows:

[0039] 1. EV mode (pure electric mode)

[0040] Under low-speed travel and light-load conditions, the second motor 23 drives the loader to travel and / or the first motor 22 drives the hydraulic pump group to work, and the engine 25 stops to achieve zero emission. The energy flow in this mode is shown in Figure 2 .

[0041] 2. Parallel mode

[0042] Under the working condition of low speed travel and high torque, the engine 25 and the first motor 22 jointly drive the hydraulic pump group to work, thereby improving the working efficiency. The energy flow direction in this mode is shown in FIG. Figure 3 .

[0043] 3. Series mode

[0044] Under high-speed driving conditions, the engine 25 drives the first motor 22 to generate electricity, providing the second motor 23 with the required electric energy to realize the driving of the loader, and the surplus electric energy is stored in the energy storage system. The energy flow in this mode is shown in FIG. Figure 4 .

[0045] 4. Energy recovery mode

[0046] During deceleration and braking, the second motor 23 converts kinetic energy into electrical energy, which can be preferentially supplied to the first motor 22 and the auxiliary system 70, and the surplus energy is stored in the energy storage system to achieve energy recovery. The energy flow in this mode is shown in Figure 5 .

[0047] 5. Stop idle mode

[0048] When the loader stops waiting for work or the driver is resting in the vehicle, the engine 25 is turned off, and the energy storage system maintains the operation of the air conditioner and other electrical accessories to reduce fuel consumption. The energy flow in this mode is shown in Figure 6 .

[0049] The vehicle controller 21 collects the working parameters of the loader (working parameters include vehicle speed, accelerator pedal opening (acceleration signal), brake pedal 42 opening (brake signal), load weight, hydraulic system pressure, energy storage unit 61 power, etc.), and then determines the current working condition of the loader, and then controls the operation of each system to achieve mode switching. Different operating modes are adopted for different working conditions, which can reduce the energy consumption of the engine 25, reduce emission pollution, and be more energy-saving and environmentally friendly. By setting different working modes, different working conditions can be coped with, with high work efficiency, stable power output, strong applicability, low noise level, and better operating comfort.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A hybrid power loader, characterized in that: include: A vehicle controller, an engine, a first motor, a second motor, a hydraulic pump group, a hydraulic system, a drive control system, an energy storage system and a chassis travel system, wherein the output shaft of the engine is connected to one end of the rotating shaft of the first motor; the hydraulic pump group includes at least two oil pumps, the rotating shafts of the oil pumps are sequentially connected in series, and the other end of the rotating shaft of the first motor is drivingly connected to the rotating shaft of the oil pump close to it; the hydraulic pump group is connected to the hydraulic system; the first motor and the second motor are both electrically connected to the drive control system, the drive control system is electrically connected to the energy storage system, and the second motor drives the chassis travel system to move; the vehicle controller is communicatively connected to the engine, the drive control system and the energy storage system, and in addition, the vehicle controller is electrically or communicatively connected to the hydraulic system.

2. The hybrid loader according to claim 1, characterized in that: The output shaft of the engine is connected to the rotating shaft of the first motor through a torque damper or an elastic coupling.

3. The hybrid loader according to claim 1, characterized in that: The hydraulic system includes a working hydraulic system, a steering hydraulic system and a priority valve. The two oil pumps in the hydraulic pump group are defined as a first oil pump and a second oil pump. The first oil pump is connected to the working hydraulic system via a pipeline, and the second oil pump is connected to the steering hydraulic system and the working hydraulic system via a priority valve pipeline.

4. The hybrid loader according to claim 1, characterized in that: The energy storage system includes an energy storage unit, a BMS and a high-voltage box, wherein the high-voltage box is electrically connected to the energy storage unit and the drive control system, and the BMS is connected to the high-voltage box and the energy storage unit.

5. The hybrid loader according to claim 4, characterized in that: The energy storage unit is a super capacitor, a lithium battery or a sodium battery.

6. The hybrid loader according to claim 1, characterized in that: The chassis running system includes a frame, a gearbox, a gearbox control unit, a front drive axle and a rear drive axle. The gearbox has an input shaft, a first output shaft and a second output shaft. The first output shaft is connected to the front drive axle by driving, and the second output shaft is connected to the rear drive axle by driving. Wheels are arranged at both ends of the front drive axle and the rear drive axle. The input shaft of the gearbox is connected to the second motor by driving. The gearbox control unit is used to control the gearbox to switch gears, and the gearbox control unit is communicatively connected to the vehicle controller.

7. The hybrid loader according to claim 1, characterized in that: The communication connection mode between the vehicle controller and the engine, drive control system and energy storage system is CAN network communication.

8. The hybrid loader according to claim 1, characterized in that: It also includes a control system, which includes an operating handle, a brake pedal, an accelerator pedal and a steering wheel, and the operating handle, brake pedal, accelerator pedal and steering wheel are all connected to the vehicle controller.

9. The hybrid loader according to claim 1, characterized in that: It also includes an auxiliary system, which includes a low-voltage battery, a PTC heater, an air-conditioning compressor and an air pump. The low-voltage battery, the PTC heater, the air-conditioning compressor and the air pump are all connected to the drive control system.

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