Construction machine power system and construction machine

Abstract

This utility model relates to the field of construction machinery technology, and discloses a power system and construction machinery for construction machinery, including: an electric drive system comprising a first motor, a second motor, and a first input shaft, wherein the first motor and the second motor are connected in parallel and both are driven by the first input shaft; a fuel power system comprising a fuel engine and a second input shaft, wherein the fuel engine is driven by the second input shaft; and a power output shaft, which is driven by both the first and second input shafts. The construction machinery of this utility model, by incorporating both the electric drive system and the fuel power system, with the electric drive system using two motors working together to provide power to the power output shaft, can adapt to working scenarios requiring larger loads or higher performance, ensuring sufficient power for the construction machinery during operation; when the construction machinery changes working environments, the system switching ensures that the relocation of the construction machinery is not restricted by external cables, making the working environment of the construction machinery more flexible.

Description

[0001] Citation of relevant applications

[0002] This application claims priority to Chinese Patent Application No. 2024213946415, filed on June 18, 2024, entitled “Power System for Engineering Machinery and Engineering Machinery”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This utility model relates to the field of engineering machinery technology, specifically to an engineering machinery power system and engineering machinery. Background Technology

[0004] Construction machinery is an important component of the equipment manufacturing industry, capable of improving operational efficiency. Taking excavators as an example, current excavators are all powered by diesel engines. The noise and emissions from diesel engines contribute to environmental pollution, and diesel fuel is a non-renewable resource with its price constantly rising, increasing the operating costs of excavators.

[0005] Currently, electric on-board excavators are being gradually promoted and widely used. However, these excavators currently rely on the power grid for energy, and their working range is limited and relocation is difficult due to the constraints of external cables. Utility Model Content

[0006] In view of this, the present invention provides a power system and engineering machinery for engineering machinery, so as to solve the problems of limited working range and difficulty in relocation of electric-powered engineering machinery.

[0007] In a first aspect, this utility model provides a power system for engineering machinery, comprising:

[0008] An electric drive system includes a first motor, a second motor, and a first input shaft. The first motor and the second motor are connected in parallel and are both driven by the first input shaft.

[0009] A fuel-powered system includes a fuel engine and a second input shaft, wherein the fuel engine is connected to the second input shaft in a driving connection.

[0010] The power output shaft is connected to the first input shaft and the second input shaft respectively.

[0011] Beneficial effects: By installing two motors in the EV system and connecting them in parallel to the first input shaft, the first input shaft is connected to the power output shaft. The combined operation of the two motors provides stronger power output, adapting to work scenarios with larger loads or higher performance requirements, ensuring sufficient power for the construction machinery during operation. Using the EV system effectively reduces pollutant emissions and lowers operating costs. Furthermore, by incorporating a fuel-powered system, the working range of the construction machinery can be effectively increased. When changing work environments, switching from the EV system to a fuel-powered system eliminates the restriction of external cables during relocation, making the construction machinery more flexible in its work scenarios.

[0012] In one alternative embodiment, the first input shaft is connected to the power output shaft via a first gear pair, and the second input shaft is connected to the power output shaft via a second gear pair.

[0013] Beneficial effects: The first and second input shafts are connected to the power output shaft by two gear pairs; the gear pairs can withstand large loads and torques and provide stable and reliable power transmission, making them suitable for various heavy-duty and high-power applications; moreover, the transmission efficiency of the gear pairs is high, which can effectively reduce energy loss.

[0014] In one optional embodiment, the first gear pair includes a first input gear, a first driving gear, a first output gear, and a first driven gear; the first driving gear meshes with the first input gear and the first driven gear, respectively, and the first output gear meshes with the first driven gear;

[0015] The second gear pair includes a second input gear, a second driving gear, a second output gear, and a second driven gear; the second driving gear meshes with the second input gear and the second driven gear, respectively, and the second output gear meshes with the second driven gear;

[0016] Both the first output gear and the second output gear are mounted on the power output shaft.

[0017] Beneficial effects: The first input gear is connected to the first input shaft. The first driving gear meshes with the first input gear, the first driven gear meshes with the first driving gear, and the first output gear meshes with the first driven gear. The first output gear is mounted on the power output shaft. When the first input shaft is driven to rotate, it drives the first input gear to rotate, which in turn drives the meshed first driving gear, first driven gear, and first output gear to rotate, thereby driving the power output shaft to rotate and providing driving force for the hydraulic pump. Similarly, the second input gear is connected to the second input shaft. The second driving gear meshes with the second input gear, the second driven gear meshes with the second driving gear, and the second output gear meshes with the second driven gear. The second output gear is mounted on the power output shaft. When the second input shaft is driven to rotate, it drives the second input gear to rotate, which in turn drives the meshed second driving gear, second driven gear, and second output gear to rotate, thereby driving the power output shaft to rotate and providing driving force for the hydraulic pump. By transmitting driving force through multiple gear meshing, it can withstand large loads and torques and provide stable and reliable power transmission, making it suitable for various heavy-duty and high-power applications.

[0018] In one optional embodiment, the electric drive system further includes a first electromagnetic clutch, which is disposed between the first input shaft and the power output shaft, and is used to control the transmission connection or disconnection between the first input shaft and the power output shaft.

[0019] The fuel power system also includes a second electromagnetic clutch, which is disposed between the second input shaft and the power output shaft, and is used to control the transmission connection or disconnection between the second input shaft and the power output shaft.

[0020] Beneficial effects: The first electromagnetic clutch is located between the first input shaft and the power output shaft; by controlling the closing of the first electromagnetic clutch, the first input shaft and the power output shaft are connected in a transmission manner, enabling the electric drive system to provide operating power for the construction machinery; the second electromagnetic clutch is located between the second input shaft and the power output shaft; by controlling the closing of the second electromagnetic clutch, the second input shaft and the power output shaft are connected in a transmission manner, enabling the fuel power system to provide operating power for the construction machinery; by setting two electromagnetic clutches to control the operation of the electric drive system and the fuel power system respectively, and when one of the two electromagnetic clutches is in the closed state, the other electromagnetic clutch is in the open state, avoiding damage to the hydraulic system due to excessive input torque of the input shaft.

[0021] In one alternative implementation, it further includes:

[0022] A first current sensor is electrically connected to the first electromagnetic clutch and is used to detect the current passing through the first electromagnetic clutch.

[0023] The second current sensor, electrically connected to the second electromagnetic clutch, is used to detect the current passing through the second electromagnetic clutch.

[0024] Beneficial effects: By setting two current sensors corresponding to the two electromagnetic clutches, the current passing through the two electromagnetic clutches is detected. When the first electromagnetic clutch is in the closed state, the first current sensor detects the current passing through the first electromagnetic clutch. If the current detected by the first current sensor exceeds the target threshold, the second electromagnetic clutch will not be energized to close. Similarly, when the second electromagnetic clutch is in the closed state, the second current sensor detects the current passing through the second electromagnetic clutch. If the current detected by the second current sensor exceeds the target threshold, the first electromagnetic clutch will not be energized to close. This avoids the simultaneous closure of both electromagnetic clutches, which could lead to excessive input torque on the input shaft and damage to the hydraulic system.

[0025] In one optional embodiment, the traction electric drive system further includes:

[0026] A first motor controller is electrically connected to the first motor;

[0027] The second motor controller is electrically connected to the second motor;

[0028] An electric slip ring is electrically connected to the first motor controller and the second motor controller, respectively. The first motor controller and the second motor controller are used to control the operation of the first motor and the second motor according to the electrical energy transmitted by the electric slip ring.

[0029] Beneficial effects: By electrically connecting the first motor controller to the first motor and the second motor controller to the second motor, the two motor controllers receive and process various sensor signals and control commands, enabling intelligent control of both motors. Depending on the needs of different operating scenarios, the two motor controllers can flexibly allocate power between the two motors, achieving more efficient energy utilization. Furthermore, if one motor or controller fails, the other motor can continue to operate, improving the overall reliability of the electric drive system.

[0030] By setting up slip rings that are electrically connected to the first motor controller and the second motor controller respectively, electrical energy can be transmitted to the first motor controller and the second motor controller through the slip rings. The first motor controller and the second motor controller control the operation of the first motor and the second motor according to the electrical energy transmitted by the slip rings, thereby controlling the operation of the electric drive system. The slip rings can also ensure the precise control of the motors by the motor controllers, prevent external cables from getting tangled when the construction machinery is rotating, improve the reliability and stability of the electric drive system, and ensure the normal operation of the electric drive system.

[0031] In one optional embodiment, the traction electric drive system further includes:

[0032] An integrated DC cabinet, electrically connected to the slip ring, is used to convert AC power into DC power.

[0033] Beneficial effects: The integrated DC cabinet connects to the external power grid, allowing the grid to input power. The integrated DC cabinet converts the AC power from the grid into DC power for use by the electric traction drive system. The integrated DC cabinet is also electrically connected to slip rings, enabling power transmission and interaction between the two, resulting in a more rational, efficient, and stable power supply and distribution for the electric traction drive system. The integrated DC cabinet ensures that power conversion and transmission occur within an integrated and standardized cabinet, improving the reliability and maintainability of the electric traction drive system.

[0034] Secondly, this utility model also provides an engineering machinery, including: a vehicle controller;

[0035] In the aforementioned engineering machinery power system, the vehicle controller is electrically connected to both the electric traction system and the fuel power system, and is used to control the switching between the electric traction system and the fuel power system.

[0036] Beneficial effects: By controlling the switching between the electric drive system and the fuel power system through the vehicle controller, the construction machinery can flexibly select the most suitable power source under different working conditions, effectively improving the performance, efficiency and reliability of the construction machinery.

[0037] In one optional implementation, the vehicle controller is electrically connected to the first electromagnetic clutch and the second electromagnetic clutch, respectively, for controlling the first electromagnetic clutch and the second electromagnetic clutch to open or close.

[0038] Beneficial Effects: By electrically connecting the vehicle controller to the first and second electromagnetic clutches, when the vehicle controller receives a system switching command, if the electric drive system is in operation, the first electromagnetic clutch is disengaged, disconnecting the transmission connection between the first input shaft and the power output shaft. Then, the second electromagnetic clutch is closed, connecting the second input shaft to the power output shaft, switching to the fuel-powered system to provide operating power. Similarly, when the vehicle controller receives a system switching command, if the fuel-powered system is in operation, the second electromagnetic clutch is disengaged, disconnecting the transmission connection between the second input shaft and the power output shaft. Then, the first electromagnetic clutch is closed, connecting the first input shaft to the power output shaft, switching to the electric drive system to provide operating power. By controlling the disengagement or closure of the first and second electromagnetic clutches through the vehicle controller to achieve system switching, the construction machinery can flexibly select the most suitable power source under different working conditions, effectively improving the performance, efficiency, and reliability of the construction machinery.

[0039] In an optional implementation, the vehicle controller is further configured to disconnect the coil switch on the second electromagnetic clutch based on the first current sensor detecting that the current value through the first electromagnetic clutch exceeds a target threshold.

[0040] Alternatively, if the second current sensor detects that the current value passing through the second electromagnetic clutch exceeds the target threshold, the coil switch on the first electromagnetic clutch can be disconnected.

[0041] Beneficial effects: After the first electromagnetic clutch is engaged, current flows through the coil switch, the first current sensor detects the current value passing through the first electromagnetic clutch, and the vehicle controller obtains the current value passing through the first electromagnetic clutch. When it is determined that the current value exceeds the target threshold, the vehicle controller will disconnect the coil switch on the second electromagnetic clutch. Similarly, after the second electromagnetic clutch is engaged, current flows through the coil switch, the second current sensor detects the current value passing through the second electromagnetic clutch, and the vehicle controller obtains the current value passing through the second electromagnetic clutch. When it is determined that the current value exceeds the target threshold, the vehicle controller will disconnect the coil switch on the first electromagnetic clutch. This avoids the simultaneous engagement of both electromagnetic clutches, which could lead to excessive input torque on the input shaft and damage to the hydraulic system. Attached Figure Description

[0042] 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.

[0043] Figure 1 This is a schematic diagram of the structure of a power system for engineering machinery according to an embodiment of the present utility model.

[0044] Explanation of reference numerals in the attached figures:

[0045] 110. Integrated DC cabinet; 120. Electric slip ring; 131. First motor controller; 132. Second motor controller; 141. First motor; 142. Second motor; 150. First input shaft; 151. First input gear; 152. First drive gear; 160. First electromagnetic clutch; 170. First current sensor; 210. Fuel engine; 220. Second input shaft; 221. Second input gear; 222. Second drive gear; 230. Second electromagnetic clutch; 240. Second current sensor; 300. Power grid; 400. Power output shaft; 410. First output gear; 420. First driven gear; 430. Second output gear; 440. Second driven gear; 500. Hydraulic oil pump. Detailed Implementation

[0046] 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.

[0047] The engineering machinery in related technologies is driven by a single motor. Using a single motor requires a dedicated low-speed, high-torque motor, which is expensive and unreliable. The engineering machinery in related technologies is equipped with two sets of hydraulic pumps and check valves, resulting in a complex structure, large space occupation, and high investment costs.

[0048] In view of this, the present invention provides a power system for construction machinery. By setting up an electric drive system and a fuel power system to provide power to a single hydraulic pump, the space occupied in the construction machinery can be effectively reduced and the investment cost can be lowered. When the construction machinery changes working scenarios, it can be switched from the electric drive system to the fuel power system, so that the relocation of the construction machinery is not restricted by external cables, making the working scenarios of the construction machinery more flexible.

[0049] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0050] According to embodiments of the present invention, on the one hand, such as Figure 1 As shown, a power system for engineering machinery is provided, including: an electric drive system, including a first motor 141, a second motor 142 and a first input shaft 150, wherein the first motor 141 and the second motor 142 are connected in parallel and are both driven by the first input shaft 150; a fuel power system, including a fuel engine 210 and a second input shaft 220, wherein the fuel engine 210 is driven by the second input shaft 220; and a power output shaft 400, which is driven by both the first input shaft 150 and the second input shaft 220.

[0051] In this embodiment, by setting up an electric drive system and a fuel-powered system, the construction machinery combines the advantages of electric excavators and traditional fuel-powered excavators. The construction machinery can switch between the electric drive system and the fuel-powered system according to usage requirements or work scenarios, allowing different systems to provide power, effectively improving the working efficiency of the construction machinery. The electric drive system includes a first motor 141 and a second motor 142, which are connected in parallel and then driven by a first input shaft 150. The first input shaft 150 is driven by the two motors. The first input shaft 150 is connected to a power output shaft 400, and the two motors working together provide power to the power output shaft 400, providing stronger power output to adapt to work scenarios with larger loads or higher performance requirements, ensuring sufficient power for the construction machinery during operation. When the construction machinery uses the electric drive system, pollutant emissions can be effectively reduced, lowering the operating costs of the construction machinery.

[0052] The fuel-powered system includes a fuel engine 210, which is connected to a second input shaft 220, which in turn is connected to a power output shaft 400, providing power to the construction machinery. When the construction machinery is switched to a work scenario without an electric power grid 300, it can be switched from an electric drive system to a fuel-powered system, freeing it from the limitations of external cables and making its work more flexible. This effectively increases the working range of the construction machinery. Furthermore, the power output shaft 400 is connected to a hydraulic pump 500, and both the electric drive system and the fuel-powered system provide power to the single hydraulic pump 500 via the power output shaft 400, effectively reducing the space occupied within the construction machinery and lowering investment costs.

[0053] In one embodiment, the first input shaft 150 is connected to the power output shaft 400 via a first gear pair, and the second input shaft 220 is connected to the power output shaft 400 via a second gear pair.

[0054] In this embodiment, the first input shaft 150 and the second input shaft 220 are respectively connected to the power output shaft 400 by two gear pairs. The gear pairs can withstand large loads and torques and provide stable and reliable power transmission, making them suitable for various heavy-load and high-power applications. Moreover, the transmission efficiency of the gear pairs is high, which can effectively reduce energy loss.

[0055] In one embodiment, the first gear pair includes a first input gear 151, a first driving gear 152, a first output gear 410, and a first driven gear 420; the first driving gear 152 meshes with the first input gear 151 and the first driven gear 420, and the first output gear 410 meshes with the first driven gear 420; the second gear pair includes a second input gear 221, a second driving gear 222, a second output gear 430, and a second driven gear 440; the second driving gear 222 meshes with the second input gear 221 and the second driven gear 440, and the second output gear 430 meshes with the second driven gear 440; the first output gear 410 and the second output gear 430 are both mounted on the power output shaft 400.

[0056] In this embodiment, the first input gear 151 is connected to the first input shaft 150, the first driving gear 152 is meshed with the first input gear 151, the first driven gear 420 is meshed with the first driving gear 152, the first output gear 410 is meshed with the first driven gear 420, and the first output gear 410 is mounted on the power output shaft 400. When the first input shaft 150 is driven to rotate, the first input gear 151 is driven to rotate, which in turn drives the meshed first driving gear 152, first driven gear 420, and first output gear 410 to rotate, thereby driving the power output shaft 400 to rotate and providing driving force for the hydraulic pump 500. Similarly, the second input gear 221 is connected to the second input shaft 220, the second driving gear 222 meshes with the second input gear 221, the second driven gear 440 meshes with the second driving gear 222, the second output gear 430 meshes with the second driven gear 440, and the second output gear 430 is mounted on the power output shaft 400. When the second input shaft 220 is driven to rotate, it drives the second input gear 221 to rotate, which in turn drives the meshing second driving gear 222, second driven gear 440, and second output gear 430 to rotate, thereby driving the power output shaft 400 to rotate and providing driving force to the hydraulic pump 500. By transmitting driving force through multiple gear meshing, it can withstand large loads and torques and provide stable and reliable power transmission, making it suitable for various heavy-duty and high-power applications.

[0057] In one embodiment, the electric drive system further includes a first electromagnetic clutch 160, which is disposed between the first input shaft 150 and the power output shaft 400, and is used to control the transmission connection or disconnection between the first input shaft 150 and the power output shaft 400; the fuel power system further includes a second electromagnetic clutch 230, which is disposed between the second input shaft 220 and the power output shaft 400, and is used to control the transmission connection or disconnection between the second input shaft 220 and the power output shaft 400.

[0058] In this embodiment, the first electromagnetic clutch 160 is disposed between the first input shaft 150 and the power output shaft 400. When current flows through the energized coil of the first electromagnetic clutch 160, the energized coil generates magnetic force, thereby closing the first electromagnetic clutch 160, which in turn controls the transmission connection between the first input shaft 150 and the power output shaft 400, enabling the electric drive system to provide operating power for the construction machinery. The second electromagnetic clutch 230 is disposed between the second input shaft 220 and the power output shaft 400. When current flows through the energized coil of the second electromagnetic clutch 230, the energized coil generates magnetic force, thereby closing the second electromagnetic clutch 230, which in turn controls the transmission connection between the second input shaft 220 and the power output shaft 400, enabling the fuel power system to provide operating power to the construction machinery. By setting two electromagnetic clutches, the electric drive system and the fuel power system can be controlled to work separately. Moreover, when one of the two electromagnetic clutches is in the closed state, the other electromagnetic clutch is in the open state, ensuring that one of the electric drive system and the fuel power system is in the working state, avoiding the simultaneous operation of the electric drive system and the fuel power system, which would cause excessive input torque on the input shaft and damage the hydraulic system.

[0059] In one embodiment, the device further includes: a first current sensor 170 electrically connected to the first electromagnetic clutch 160 for detecting the current passing through the first electromagnetic clutch 160; and a second current sensor 240 electrically connected to the second electromagnetic clutch 230 for detecting the current passing through the second electromagnetic clutch 230.

[0060] In this embodiment, a first current sensor 170 is located at the first electromagnetic clutch 160 and electrically connected to it, detecting the current passing through the first electromagnetic clutch 160. When the first electromagnetic clutch 160 is in the closed state, the first current sensor 170 detects the current passing through it. If the current value detected by the first current sensor 170 exceeds a target threshold, the second electromagnetic clutch 230 cannot be energized to close. Similarly, a second current sensor 240 is located at the second electromagnetic clutch 230 and electrically connected to it, detecting the current passing through it. When the second electromagnetic clutch 230 is in the closed state, the second current sensor 240 detects the current passing through it. If the current value detected by the second current sensor 240 exceeds a target threshold, the first electromagnetic clutch 160 cannot be energized to close. This prevents both electromagnetic clutches from closing simultaneously, which could lead to excessive input torque on the input shaft and damage to the hydraulic system. The preset current value can be set according to actual usage requirements and is not specifically limited.

[0061] In other embodiments, the first current sensor 170 and the second current sensor 240 are communicatively connected.

[0062] The first current sensor 170 and the second current sensor 240 are connected via a LIN (Local Interconnect Network) bus. This allows communication of the current values ​​at the first electromagnetic clutch 160 and the second electromagnetic clutch 230, ensuring that only one electromagnetic clutch is engaged at a time, thus preventing the simultaneous operation of the electric drive system and the fuel-powered system. Using LIN bus communication results in lower costs, a simpler structure, and easier operation.

[0063] In one embodiment, the electric drive system further includes: a first motor controller 131 electrically connected to a first motor 141; a second motor controller 132 electrically connected to a second motor 142; and an electric slip ring 120 electrically connected to both the first motor controller 131 and the second motor controller 132. The first motor controller 131 and the second motor controller 132 are used to control the operation of the first motor 141 and the second motor 142 according to the electrical energy transmitted by the electric slip ring 120.

[0064] In this embodiment, the first motor controller 131 is electrically connected to the first motor 141 and is used to control the operation of the first motor 141; the second motor controller 132 is electrically connected to the second motor 142 and is used to control the operation of the second motor 142. The two motor controllers can receive and process various sensor signals, control commands, etc., to precisely control the operating parameters such as the speed, torque, and direction of the first motor 141 and the second motor 142, enabling intelligent control of both motors. If one motor or controller fails, the other motor can continue to operate, improving the overall reliability of the electric drive system. Furthermore, the two motor controllers can flexibly allocate power between the two motors according to the needs of different working scenarios, achieving more efficient energy utilization.

[0065] For example, when construction machinery is under normal load, the two motor controllers can distribute power evenly between the two motors, ensuring the normal operation of the electric drive system and guaranteeing smooth power output from the power take-off shaft. However, if both motors are under low load for an extended period, and their speed and torque are outside their efficient operating range, continued operation of both motors would lead to low energy efficiency. In this case, one motor and its controller can be shut down, leaving only one motor running and all power distributed to it. This allows the reserved motor to operate within its efficient operating range, reducing energy consumption and improving energy utilization.

[0066] By setting the electric slip ring 120 to be electrically connected to the first motor controller 131 and the second motor controller 132 respectively, electrical energy can be transmitted to the first motor controller 131 and the second motor controller 132 through the electric slip ring 120, thereby controlling the operation of the electric drive system; the electric slip ring 120 can also ensure the precise control of the motor by the motor controller, and can prevent external cables from getting tangled when the construction machinery is rotating, thereby improving the reliability and stability of the electric drive system and ensuring that the electric drive system can operate normally.

[0067] In one embodiment, the electric drive system further includes:

[0068] The integrated DC cabinet 110, which is electrically connected to the slip ring 120, is used to convert AC power to DC power.

[0069] In this embodiment, the integrated DC cabinet 110 is connected to the external power grid 300, which can input power into the integrated DC cabinet 110. The integrated DC cabinet 110 converts the AC power input from the power grid 300 into DC power for use by the electric drive system. The integrated DC cabinet 110 is electrically connected to the slip ring 120, enabling power transmission and interaction between the integrated DC cabinet 110 and the slip ring 120, making the power supply and distribution of the electric drive system more rational, efficient, and stable. The integrated DC cabinet 110 ensures that power conversion and transmission take place in an integrated and standardized cabinet, improving the reliability and maintainability of the electric drive system.

[0070] According to an embodiment of the present invention, another aspect provides an engineering machinery, including: a vehicle controller; the above-mentioned engineering machinery power system, wherein the vehicle controller is electrically connected to both an electric traction system and a fuel power system, and is used to control the switching between the electric traction system and the fuel power system.

[0071] The engineering machinery in this embodiment of the utility model can be excavators, forklifts, graders, etc., and is not specifically limited here.

[0072] In this embodiment, the switching between the electric drive system and the fuel power system is controlled by the vehicle controller, ensuring that the construction machinery can flexibly select the most suitable power source under different working conditions, effectively improving the performance, efficiency and reliability of the construction machinery.

[0073] In one embodiment, the vehicle controller is electrically connected to the first electromagnetic clutch 160 and the second electromagnetic clutch 230 respectively, and is used to control the first electromagnetic clutch 160 and the second electromagnetic clutch 230 to open or close.

[0074] In this embodiment, the vehicle controller is electrically connected to the first electromagnetic clutch 160 and the second electromagnetic clutch 230. When the vehicle controller receives a system switching command, if the electric drive system is in operation, the vehicle controller controls the first electromagnetic clutch 160 to disengage, thereby disconnecting the transmission connection between the first input shaft 150 and the power output shaft 400. Then, the second electromagnetic clutch 230 is controlled to close, connecting the second input shaft 220 to the power output shaft 400, switching to the operation of the fuel power system to provide working power. Similarly, when the vehicle controller receives a system switching command, if the fuel power system is in operation, the vehicle controller controls the second electromagnetic clutch 230 to disengage, thereby disconnecting the transmission connection between the second input shaft 220 and the power output shaft 400. Then, the first electromagnetic clutch 160 is controlled to close, connecting the first input shaft 150 to the power output shaft 400, switching to the operation of the electric drive system to provide working power. By controlling the switching between the electric drive system and the fuel power system through the vehicle controller, the construction machinery can flexibly select the most suitable power source under different working conditions, effectively improving the performance, efficiency and reliability of the construction machinery.

[0075] In one embodiment, it further includes: an operation button, electrically connected to the vehicle controller, for sending a system switching command to the vehicle controller.

[0076] In this embodiment, a system switching command is sent to the vehicle controller via operation buttons to switch between the electric drive system and the fuel-powered system. If the electric drive system is active, pressing the operation button sends a system switching command to the vehicle controller, switching to the fuel-powered system. Conversely, if the fuel-powered system is active, pressing the operation button sends a system switching command to the vehicle controller, switching to the electric drive system. The operation buttons allow for direct and explicit transmission of system switching commands. Accurately pressing a specific button ensures the correct command is issued, reducing the possibility of errors. The buttons also provide a rapid response, promptly sending the system switching command to the vehicle controller, and are simple to use, easy to understand, and easy to master.

[0077] In other embodiments, the operation buttons include a first operation button and a second operation button; the two operation buttons are used to generate switching commands for the electric drive system and the fuel power system, respectively. For example, pressing the first operation button generates a switching command for the electric drive system. If the fuel power system is active, the system switches to the electric drive system; if the electric drive system is active, pressing the first operation button will not trigger a response from the vehicle controller. Similarly, pressing the second operation button generates a switching command for the fuel power system. If the electric drive system is active, the system switches to the fuel power system; if the fuel power system is active, pressing the second operation button will not trigger a response from the vehicle controller. The specific configuration of the first and second operation buttons can be customized according to actual usage requirements.

[0078] In one embodiment, it further includes: a display panel disposed on the construction machinery; and touch keys for operation disposed on the display panel.

[0079] In this embodiment, the display panel is a screen installed on the construction machinery, and the touch keys are located on the screen. When it is necessary to switch the power system, the touch keys can be operated on the screen. By setting the touch keys on the screen, the space required for physical buttons inside the construction machinery can be effectively reduced, making the internal appearance of the construction machinery more concise and beautiful, improving the overall quality. It also allows users to operate directly on the display panel without having to search for buttons in other locations inside the construction machinery, thus improving the convenience of operation.

[0080] In one specific embodiment, when the fuel power system is in operation, a system switching command is generated by pressing a touch key on the display screen; the system switching command is sent to the vehicle controller, which controls the fuel engine 210 of the fuel power system to stop, then disconnects the second electromagnetic clutch 230, disconnecting the second input shaft 220 from the power output shaft 400; then controls the first electromagnetic clutch 160 to close, drivingly connecting the first input shaft 150 to the power output shaft 400; then the electric drive system executes a high-voltage process, including sequentially closing relays to provide high-voltage power to the two motor controllers through the electric drive system, controlling the two high-speed motors to work and providing power for the construction machinery.

[0081] When the electric drive system is in operation, a system switching command is generated by pressing a touch key on the display screen. The system switching command is then sent to the vehicle controller, which controls the electric drive system to execute a high-voltage process, including sequentially disconnecting relays to disconnect the high-voltage power supply to the motor controller; controlling the second electromagnetic clutch 230 to disengage, thus disconnecting the first input shaft 150 from the power output shaft 400; then controlling the second input shaft 220 to drive the power output shaft 400, and finally starting the fuel engine 210 to provide power for the construction machinery.

[0082] In one embodiment, the vehicle controller is further configured to disconnect the coil switch on the second electromagnetic clutch 230 based on the first current sensor 170 detecting that the current value through the first electromagnetic clutch 160 exceeds a target threshold; or to disconnect the coil switch on the first electromagnetic clutch 160 based on the second current sensor 240 detecting that the current value through the second electromagnetic clutch 230 exceeds a target threshold.

[0083] In this embodiment, after the first electromagnetic clutch 160 is closed, current flows through the coil switch. The first current sensor 170 detects the current value passing through the first electromagnetic clutch 160. The vehicle controller acquires the current value passing through the first electromagnetic clutch 160. When it determines that the current value exceeds the target threshold, the vehicle controller will disconnect the coil switch on the second electromagnetic clutch 230. Similarly, after the second electromagnetic clutch 230 is closed, current flows through the coil switch. The second current sensor 240 detects the current value passing through the second electromagnetic clutch 230. The vehicle controller acquires the current value passing through the second electromagnetic clutch 230. When it determines that the current value exceeds the target threshold, the vehicle controller will disconnect the coil switch on the first electromagnetic clutch 160. This prevents both electromagnetic clutches from closing simultaneously, which could lead to excessive input torque on the input shaft and damage to the hydraulic system. The target threshold can be set according to actual usage requirements and is not specifically limited.

[0084] 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 power system for engineering machinery, characterized in that, include: An electric drive system includes a first motor, a second motor, and a first input shaft. The first motor and the second motor are connected in parallel and are both driven by the first input shaft. A fuel-powered system includes a fuel engine and a second input shaft, wherein the fuel engine is connected to the second input shaft in a driving connection. The power output shaft is connected to the first input shaft and the second input shaft respectively.

2. The engineering machinery power system according to claim 1, characterized in that, The first input shaft is connected to the power output shaft via a first gear pair, and the second input shaft is connected to the power output shaft via a second gear pair.

3. The engineering machinery power system according to claim 2, characterized in that, The first gear pair includes a first input gear, a first driving gear, a first output gear, and a first driven gear; the first driving gear meshes with the first input gear and the first driven gear, respectively, and the first output gear meshes with the first driven gear; The second gear pair includes a second input gear, a second driving gear, a second output gear, and a second driven gear; the second driving gear meshes with the second input gear and the second driven gear, respectively, and the second output gear meshes with the second driven gear; Both the first output gear and the second output gear are mounted on the power output shaft.

4. The engineering machinery power system according to claim 1, characterized in that, The electric drive system further includes a first electromagnetic clutch, which is disposed between the first input shaft and the power output shaft and is used to control the transmission connection or disconnection between the first input shaft and the power output shaft. The fuel power system also includes a second electromagnetic clutch, which is disposed between the second input shaft and the power output shaft, and is used to control the transmission connection or disconnection between the second input shaft and the power output shaft.

5. The engineering machinery power system according to claim 4, characterized in that, Also includes: A first current sensor is electrically connected to the first electromagnetic clutch and is used to detect the current passing through the first electromagnetic clutch. The second current sensor, electrically connected to the second electromagnetic clutch, is used to detect the current passing through the second electromagnetic clutch.

6. The engineering machinery power system according to claim 1, characterized in that, The electric drive system also includes: A first motor controller is electrically connected to the first motor; The second motor controller is electrically connected to the second motor; An electric slip ring is electrically connected to the first motor controller and the second motor controller, respectively. The first motor controller and the second motor controller are used to control the operation of the first motor and the second motor according to the electrical energy transmitted by the electric slip ring.

7. The engineering machinery power system according to claim 6, characterized in that, The electric drive system also includes: An integrated DC cabinet, electrically connected to the slip ring, is used to convert AC power into DC power.

8. An engineering machinery, characterized in that, include: Vehicle controller; According to any one of claims 1 to 7, the vehicle controller is electrically connected to both the electric traction system and the fuel power system, and is used to control the switching between the electric traction system and the fuel power system.

9. The engineering machinery according to claim 8, characterized in that, The vehicle controller is electrically connected to the first electromagnetic clutch and the second electromagnetic clutch respectively, and is used to control the first electromagnetic clutch and the second electromagnetic clutch to open or close.

10. The engineering machinery according to claim 9, characterized in that, The vehicle controller is also used to cut off the coil switch on the second electromagnetic clutch based on the first current sensor detecting that the current value through the first electromagnetic clutch exceeds a target threshold. Alternatively, if the second current sensor detects that the current value passing through the second electromagnetic clutch exceeds the target threshold, the coil switch on the first electromagnetic clutch can be disconnected.

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